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1 2017 Fall Meeting of The Korean Ceramic Society 2 / 0 / 1 / 7

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15 2018 한국세라믹학회 춘계학술대회및총회 2018 년 4 월 11 일 ( 수 )~13 일 ( 금 ) / CECO, 창원 일반세션 G1. 전자세라믹스 G2. 에너지환경세라믹스 G3. 엔지니어링세라믹스 G4. 나노융합세라믹스 G5. 바이오세라믹스 G6. 유리및비정질세라믹스 G7. 내화물및시멘트세라믹스 G8. 전산재료과학및재료분석 G9. 생활및전통세라믹스 발표분야 주제별심포지엄 심포지엄개최를원하시는회원 ( 비회원도가능 ) 또는부회는개최신청서를작성하여제출 서울특별시서초구방배로 76, 머리재빌딩 403 호 T ,

16 The Korean Ceramic Society 2018 년한국세라믹학회춘계학술대회 심포지엄개최신청서 한국세라믹학회춘계학술대회가 2018년 4월 11~13일 3일간창원 CECO 에서개최됩니다. 이번학술대회에심포지엄을개최하고자하시는회원과각부회및세라믹관련연구그룹, 사업단의많은참여를바라며, 본개최신청서를작성하신후 12월 8일 ( 금요일 ) 까지학회이메일로송부해주시기바랍니다. 비회원님들의신청도환영합니다.( 심포지엄등주요일정은 4월 12, 13일예정 ) 신청및개최지원문의 : , ceramic@kcers.or.kr ( 국문 ) ( 영문 ) 조직위원장 : 공동조직위원 : 대표연락처 : 초청강연발표건수 : ( 국외참가자구분요망 ) 일반구두발표건수 : 포스터발표건수 : 예 ) 초청강연으로만구성되는여부, 진행시지원, 요구사항등. 서울특별시서초구방배로 76, 머리재빌딩 403 호 T ,

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18 Plenary Lecture I COEX Room 327, 16:20-17:00, Oct. 11 (Wed.) Porous Ceramics from Processing to Simulation Dr. Tobias Fey Head of the Cellular Ceramics and Simulation Group, University of Erlangen-Nürnberg, Erlangen, Germany Plenary Lecture II COEX Room 402, 13:00-13:40, Oct. 12 (Thu.) Recent Developments on Piezoelectric Materials Dr. Shujun Zhang ISEM, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, Australia Plenary Lecture III COEX Room 402, 13:40-14:20, Oct. 12 (Thu.) Future Research Direction of Graphene for Real Industrial Applications : Large-Area Single Crystalline Graphene

19 2017 Fall Meeting of The Korean Ceramic Society 2 / 0 / 1 / 7

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24 13:20-13:50 13:50-14:20 14:20-14:50 14:50-15:20 15:20-15:50 15:50-16:20 16:20-17:00 17:00-17:30 17:30-18:00 18:00-19:00 08:30-09:00 09:00-09:30 09:30-10:00 10:00-10:30 10:30-11:00 11:00-11:30 11:30-12:00 12:00-12:30 12:30-13:00 13:00-13:40 13:40-14:20 14:30-15:00 15:00-15:30 15:30-16:00 16:00-16:30 16:30-17:00 17:00-17:30 17:30-18:00 18:00-18:15 18:15-20:00 4

25 08:30-09:00 09:00-09:30 09:30-10:00 10:00-10:30 10:30-11:00 11:00-11:30 11:30-12:00 12:00-12:30 12:30-13:00 5

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29 Room 317A 12:00-17:00 S :20-13:50 S :50-14:20 S :20-14:50 S :50-15:20 KRICT S :20-15:50 KIER S :50-16:20 KIER 16:20-17:00 ü 17:00-18:00 18:00-19:00 9

30 Room 317B 12:00-17:00 S :20-13:40 KIER S :40-14:00 KICET S :00-14:20 NIMS JAPAN S :20-14:40 KIMS 14:40-14:50 S :50-15:10 KIMS S :10-15:30 S :30-15:50 KICET S :50-16:10 KICET S :10-16:20 16:20-17:00 ü 17:00-18:00 18:00-19:00 10

31 Room 317C 12:00-17:00 S :20-13:50 KRISS KITECH S :50-14:20 S :20-14:50 KITECH S :50-15:20 S :20-15:50 DIGIST S :50-16:20 16:20-17:00 ü 17:00-18:00 18:00-19:00 11

32 Room 318A 12:00-17:00 S :20-13:50 S :50-14:20 KIGAM S :20-14:50 S :50-15:20 S :20-15:50 KICET S :50-16:20 KICET 16:20-17:00 ü 17:00-18:00 18:00-19:00 12

33 Room 318B 12:00-17:00 S :20-13:45 KIMS S :45-14:10 UNIST S :10-14:35 14:35-14:50 S :50-15:15 KIMS S :15-15:40 S :40-16:05 Attaur Rahman KIMS 16:20-17:00 ü 17:00-18:00 18:00-19:00 13

34 Room 318C 12:00-17:00 S :20-13:50 Junichiro Shiomi Univ Tokyo Japan S :50-14:20 Mina Yoon Oak Ridge Nat l Laboratory USA S :20-14:50 Ricardo Grau Crespo Univ Reading S :50-15:05 KAIST 15:05-15:20 S :20-15:50 S :50-16:20 16:20-17:00 ü 17:00-18:00 18:00-19:00 14

35 Room :00-17:00 S :20-13:50 S :50-14:20 S :20-14:50 S :50-15:20 S :20-15:50 KOPTI S :50-16:20 16:20-17:00 ü 17:00-18:00 18:00-19:00 15

36 Room :00-17:00 S :20-13:45 UNIST S :45-14:10 S :10-14:35 S :35-15:00 KIMS 15:00-15:05 S :05-15:30 S :30-15:55 UNIST S :55-16:20 KITECH 16:20-17:00 ü 17:00-18:00 18:00-19:00 16

37 Room 317A 08:00-17:00 S :30-08:55 KIST S :55-09:20 KETI S :20-09:45 Deu Bhange Ghulam Ali KIST S :45-10:10 S :10-10:35 S :35-11:00 KIST S :00-11:25 KETI 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 17

38 Room 317A S :30-14:45 KIER UST S :45-15:00 KIST S :00-15:15 S :15-15:30 KAIST 15:30-16:00 S :00-16:15 RIST S :15-16:30 S :30-16:45 17:30-18:00 18:00-18:15 18:15-20:00 18

39 Room 317B 08:00-17:00 G3-1 09:00-09:30 KICET G3-2 09:30-09:45 LG G3-3 09:45-10:00 KIMS G3-4 10:00-10:15 KIMS G3-5 10:15-10:30 KIMS G3-6 10:30-10:45 Wahid Muhamad FR Amit Siddharth Sharma G3-7 10:45-11:00 Pipit Amit Siddharth Sharma G3-8 11:00-11:15 G3-9 11:15-11:30 KIMS 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 19

40 Room 317B S :30-14:50 Ik Jin Kim Hanseo Univ S :50-15:10 M Weyd J Richter R Kriegel N Reger Wagner Ch Pflieger H Richter I Voigt Fraunhofer Institute for Ceramic Technologies and Systems IKTS Hermsdorf Germany S :10-15:30 Chanhyuk Park KIST S :30-15:50 Kwang Taek Hwang Jongchan Lee Jinho Kim Kyusung Han Woo Seok Cho KICET S :50-16:10 Jongman Lee Jang Hoon Ha In Hyuck Song KIMS 16:10-16:20 S :20-16:40 In Hyuck Song Bukhari Syed Zaighum Abbas Jang Hoon Ha Jongman Lee KIMS S :40-17:00 Jang Hoon Ha Sujin Lee Jongman Lee In Hyuck Song KIMS S :00-17:20 Young Sang Cho Korea Polytechnic Univ S :20-17:35 Arifin Septiadi Dang Hyok Yoon Yeungnam Univ S :35-17:50 Young Seok Jung Kyoon Choi Seiki Kim KICET Korea Univ 17:30-18:00 18:00-18:15 18:15-20:00 20

41 Room 317C 08:00-17:00 S :30-08:45 Wahid Muhamad FR Amit Siddharth Sharma S :45-09:00 KICET S :00-09:25 KAERI KIER KIMS S :25-09:50 KIER S :50-10:15 KIMS 10:15-10:30 S :30-10:55 KAERI S :55-11:20 Pipit Amit Siddharth Sharma KAERI S :20-11:35 KAERI 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 S :30-14:55 S :55-15:20 KICET 21

42 Room 317C S :20-15:35 Pipit Amit Siddharth Sharma Arifin Septiadi S :35-16:00 KIER KAERI S :00-16:25 KAERI S :25-16:40 KAERI 17:30-18:00 18:00-18:15 18:15-20:00 22

43 Room 318A 08:00-17:00 10:00-10:10 10:10-10:20 SS2-1 10:20-11:00 KIST SS2-2 11:00-11:30 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 SS2-3 14:20-15:00 SS2-4 15:00-15:30 15:30-15:40 23

44 Room 318A SS2-5 15:40-16:10 KICET SS2-6 16:10-16:40 16:40-18:00 17:30-18:00 18:00-18:15 18:15-20:00 24

45 Room 318B 08:00-17:00 G2-1 08:50-09:10 KAIST G2-2 09:10-09:30 G2-3 09:30-09:50 G2-8 09:50-10:10 THAHEEM IMDADULLAH Kang Taek Lee DGIST G2-5 10:10-10:30 Kati KIER G2-6 10:30-10:50 DGIST G2-7 10:50-11:10 Nikolai Tsvetkov KAIST KIMM KICT 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 25

46 Room 318B S :30-14:45 S :45-15:00 S :00-15:15 S :15-15:30 KIMS Univ California S :30-15:42 Lin Chan Chieh Dianta Ginting Kyung Hee Univ S :42-15:54 SIYAR MUHAMMAD Seoul Nat l Univ S :54-16:06 Jamil Nguyen Van Du KICET 16:06-16:20 S :20-16:35 UNIST S :35-16:50 S :50-17:05 KICET S :05-17:17 KIGAM S :17-17:29 17:30-18:00 18:00-18:15 18:15-20:00 26

47 Room 318C 08:00-17:00 S :30-09:00 M Rahman S :00-09:30 Dong Yun Shin Chang Mi Lee Jeong An Kwon and Dong Hee Lim Chungbuk Nati l Univ S :30-09:45 10:00-10:15 S :15-10:45 Teruyasu Mizoguchi Univ Tokyo Japan S :45-11:00 S :00-11:30 POSTECH 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 27

48 Room 318C 14:30-14:35 14:35-15:35 15:40-16:30 17:30-18:00 18:00-18:15 18:15-20:00 28

49 Room :00-17:00 SS3-1 10:00-10:30 Dr Shuji SAKAGUCHI AIST Japan Secretary ISO TC206 SS3-2 10:30-11:00 KAERI SS3-3 11:00-11:30 Tai Kyu Lee NANOPAC Co Ltd 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 SS3-4 14:30-14:50 KICET SS3-5 14:50-15:10 KICET SS3-6 15:10-15:30 KICET SS3-7 15:30-15:50 KICET SS3-8 15:50-16:10 KICET KTL 17:30-18:00 18:00-18:15 18:15-20:00 29

50 Room :00-17:00 G5-1 09:00-09:30 KIER G5-2 09:30-09:50 KICET G5-3 09:50-10:10 KICET G5-4 10:10-10:30 KICET G5-5 10:30-10:50 KICET G5-6 10:50-11:10 KICET G5-7 11:10-11:30 KICET 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 G5-8 14:30-15:00 G5-9 15:00-15:20 KIMS UST G5-10 G :20-15:40 UST KIMS G :40-16:00 Darmawan bobby aditya J G Fisher 30

51 Room 325 G :00-16:20 RAJA NAREN UST KIMS G :20-16:40 KICET 17:30-18:00 18:00-18:15 18:15-20:00 31

52 Room 327A 08:00-17:00 G1-1 08:30-08:50 UNIST KETI G1-2 08:50-09:10 G1-3 09:10-09:30 IPPILI SWATHI G1-4 09:30-09:50 KU KIST 09:50-10:10 G1-5 10:10-10:30 KAIST G1-6 10:30-10:50 KU KIST G1-7 10:50-11:10 KICET G1-8 11:10-11:30 G1-9 11:30-11:50 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 32

53 Room 327A SS5-1 14:30-15:00 SS5-2 15:00-15:30 SS5-3 15:30-16:00 SS5-4 16:00-16:30 17:30-18:00 18:00-18:15 18:15-20:00 33

54 Room 327B 08:00-17:00 G6-1 08:45-09:15 G6-2 09:15-09:45 Kenji Toda KICET Niigata Univ G6-3 09:45-10:00 G6-4 10:00-10:15 KICET G6-5 10:15-10:30 G6-6 10:30-10:45 G6-7 10:45-11:00 KICET G6-8 11:00-11:15 G6-9 11:15-11:30 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 34

55 Room 327B S :30-15:00 S :00-15:30 S :30-16:00 KETI S :00-16:30 S :30-17:00 UNIVAC 17:30-18:00 18:00-18:15 18:15-20:00 35

56 Room 327C 08:00-17:00 S :40-09:00 POSTECH S :00-09:20 KAIST S :20-09:40 KIST S :40-10:00 10:00-10:10 S :10-10:30 KIST S :30-10:50 IBS S :50-11:10 S :10-11:30 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 S :40-15:00 KBSI S :00-15:20 POSTECH S :20-15:40 KAIST 36

57 Room 327C S :40-16:00 16:00-16:10 S :10-16:30 S :30-16:50 Radhe Agarwal Yogesh Sharma Siliang Chang Krishna C Pitike Changhee Sohn Serge M Nakhmanson Christos G Takoudis Ho Nyung Lee James F Scott Ram S Katiyar KAIST Univ Puerto Rico Oak Ridge Nat l Lab Univ Illinois at Chicago Univ Connecticut Storrs Univ St Andrews S :50-17:10 GIST S :10-17:30 POSTECH 17:30-18:00 18:00-18:15 18:15-20:00 37

58 Room :00-17:00 S :30-10:00 KICET S :00-10:30 S :30-11:00 KICET S :00-11:20 S :20-11:30 KICET 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 38

59 Room 328 S :30-14:55 S :55-15:20 KAIST S :20-15:45 15:45-16:00 S :00-16:25 KRICT S :25-16:50 Himchan Cho Young Hoon Kim Su Hun Jeong Min Ho Park Hobeom Kim Tae Woo Lee Seoul National Univ S :50-17:15 17:30-18:00 18:00-18:15 18:15-20:00 39

60 Room :00-17:00 09:10-09:30 S :30-10:00 POSCO RIST S :00-10:30 S :30-11:00 S :00-11:30 Technics 11:30-12:00 12:00-13:00 12:00-13:00 13:00-13:40 13:40-14:20 S :30-14:45 KERI S :45-15:00 S :00-15:15 KICET S :15-15:30 KICET 15:30-16:00 16:00-16:15 40

61 Room 403 S :15-16:30 KERI S :30-16:45 KERI S :45-17:00 17:00-17:30 17:30-18:00 18:00-18:15 18:15-20:00 41

62 Room 317A 08:00-13:00 G2-9 09:00-09:20 G :20-09:40 KAIST G :40-10:00 G :00-10:20 KIST G :20-10:40 KAIST G :40-11:00 KIER G :00-11:20 11:30-12:00 12:00-13:00 42

63 Room 317B 08:00-13:00 G :00-09:30 KIMS G :30-09:45 Nenko S Nenov KIMS G :45-10:00 Arathi KIMS G :00-10:15 Arathi KIMS G :15-10:30 KICET G :30-10:45 KICET G :45-11:00 KICET G :00-11:15 KICET G :15-11:30 11:30-12:00 12:00-13:00 43

64 Room 317C 08:00-13:00 G4-1 09:00-09:15 G4-2 09:15-09:30 KICET G4-3 09:30-09:45 G4-4 09:45-10:00 Univ Illinois at Urbana Champaign 10:00-10:15 G4-5 10:15-10:30 Jatis Kumar Dash UNIST G4-6 10:30-10:45 G4-7 10:45-11:00 11:30-12:00 12:00-13:00 44

65 Room 318A 08:00-13:00 G9-1 09:10-09:30 KICET G9-2 09:30-09:50 KICET G9-3 09:50-10:10 KICET G9-4 10:10-10:40 KICET 10:40-10:50 G9-5 10:50-11:20 KICET G7-1 11:20-11:40 11:30-12:00 12:00-13:00 45

66 Room 318B 08:00-13:00 SS4-1 10:00-10:30 SS4-2 10:30-11:00 SS4-3 11:00-11:30 SS4-4 11:30-12:00 SS4-5 12:00-12:30 11:30-12:00 12:00-13:00 46

67 Room 318C 08:00-13:00 G8-1 09:00-09:15 KICET G8-2 09:15-09:30 KIMS G8-3 09:30-09:45 G8-4 09:45-10:00 Liu Kai KIST G8-5 10:00-10:15 G8-6 10:15-10:30 Univ Illinois at Urbana Champaign G8-7 10:30-10:45 11:30-12:00 12:00-13:00 47

68 Room 327A 08:00-13:00 G :30-08:50 Tran Van Dang G :50-09:10 G :10-09:30 G :30-09:50 09:50-10:10 G :10-10:30 G :30-10:50 G :50-11:10 G :10-11:30 11:30-12:00 12:00-13:00 48

69 Poster-I KICET KICET KETI KIST KIST KETI KETI KETI KETI KETI LE GIA PHAN Pham Thuy Linh Dang Thanh Nguyen Joong Sook Lee J G Fisher Hwang Pil Kim Wook Jo Chonnam Nat l Univ UNIST UNIST ibule Photonics Co Ltd UNIST 49

70 Poster-I MA XINGHUA KIST KICET KICET KICET KERI KERI KICET Ha Minh Tan KICET KERI KERI 50

71 Poster-I KICET KICET KAIST KIGAM KIGAM Beyene Anteneh Marelign Brindha Moorthy KAIST Brindha Moorthy Kamala Bharathi Do Kyung Kim KAIST SRM Univ KICET Chandran Balamurugan Minh Dat Nguyen KIST KIMS KICET KICET KIER 51

72 Poster-I KIER KIER KIST KAIST KAIST UNIST KIER KICET KICET KICET KICET KICET 52

73 Poster-I KICET KIMS KICET LYU GUANLIN LYU GUANLIN KICET KICET KICET KHISHIGBAYARKHOSERDENE KICET KICET KICET KHISHIGBAYARKHOSERDENE KICET IAE IAE IAE Andrea Gnisci Giuliana Faggio Nicola Lisi Andrea Capasso Univ Mediterranea of Reggio Calabria ENEA Istituto Italiano di Tecnologia 53

74 Poster-I Takashi Taniguchi James Hone NIMS Columbia Univ KIST KICET POSTECH Xuelin Jin KICET KIST KIER KIER KICET KICET KICET KICET 54

75 Poster-II Ventateswaru Annapureddy Peddigari Mahesh KIMS KICET Jun Ge Liang Cong Wang Zhao Yao Ming Qing Liu Rui Wang KETI DGIST DGIST Univ Pittuburgh Fatma Pinar Gokdemir Yildiz Technical Univ KITECH GIST Nguyen Thi Nguyen 55

76 Poster-II GIST GIST KITECH KAIST KAIST KAIST KIMS Arunava Gupta KITECH Univ Alabama Wenshen Song Layla Mehdi Nigel D Browning Andrey Krayev Li Yang Parag Banerjee Washington Univ in St Louis Pacific Northwest National Laboratory AIST NT Inc KAIST KITECH 56

77 Poster-II KIER KIER KAIST KAIST UST KIER KIST UST KIER KIER KICET Aman Bhardwaj Bhupendra Singh Indian Institute of Technology Anggia Erdienzy 57

78 Poster-II KIMS KIMS KIMS UST KIMS KIST KIST Bijay Basnet Pipit Amit Siddharth Sharma Arifin Septiadi Yeungnam Univ KAERI KIER KAERI KIER KAERI KAERI KIMS KICET KICET 58

79 Poster-II Lee Sung Hyuk KIGAM SIYAR MUHAMMAD KIST Dianta Ginting Lin Chan Chieh Kyung Hee Univ SIYAR MUHAMMAD SIYAR MUHAMMAD Seoul Nat l Univ Nguyen Van Du Jamil KICET 59

80 Poster-II KOPTI KICET KICET KICET KOPTI KICET KICET 60

81 Poster-II 61

82 Poster-III Rui Wang KETI KTL Haribabu Palneedi Annapureddy Venkateswarlu UNIST KIMS KTL KICET KICET KICET KICET KAERI KICET Romain Faye Torsten Granzow Emmanuel Defay Ke Wang UNIST Luxembourg Institute of Science and Technology Tsinghua Univ Paulraj Arun Kumar Chonnam National Univ 62

83 Poster-III KICET KICET KBSI Saqib Muhammad You Dong Kim Jun Young Park Sejong Univ KIST DGIST DGIST KICET KAERI 63

84 Poster-III KAIST KITECH KIST KAIST KIGAM KIER KATECH Brayek Amine Brayek Amine Brayek Amine PARMAR NARENDRA SINGH KIST KICET KICET 64

85 Poster-III SIYAR MUHAMMAD KAERI KIMS KIGAM UST KICET KAERI KAERI CHEN ZHILEI KICET KAERI KICET KICET KTL KITECH KITECH 65

86 Poster-III KITECH IAE IAE IAE KIER KIER KIST KIST KICET KIER KIER KIER 66

87 Poster-III LG KIGAM KICET KICET KICET KICET KICET 67

88 엔지니어링세라믹스산학연기술교류회포스터 Mokpo National Univ Chonnam National Uuniv Sungkyunkwan Univ Changwon National Univ Micron Gangneungwonju National Univ Fine Ceramics Regional Innovation Center KIST KICET Jung Gyu Park Ik Jin Kim PAIM Hanseo Univ Seoul National Univ KICET KAERI KICET KICET KIST KICET KIMS KIMS KIMS KIMS Ha Neul Kim Jae Woong Ko Young Jo Park Jin Myung Kim KIMS 68

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91 구두발표 PL-1 Porous Ceramics from Processing to Simulation Tobias Fey. Chair of Glass and Ceramics, University Erlangen- Nürnberg, Germany Cellular materials offer a wide spectrum of applications such as catalyst support structures, lightweight materials, energy adsorption or energy storage materials. Due to several ways of processing and materials a wide range of material properties e.g. thermal conductivity, mechanical strength or dumping can be adjusted, measured and verified concerning to the expected properties. Especially In heterogeneous and homogenous porous structures and their composites only global effective material properties can be determined and measured. Knowledge on the predominating influence of the microstructure on the global properties is the key for design materials with desired properties. To fill this gap and enable a look-in a microstructure model derived from μ-ct measurements carried out at certain processing steps can be used as model for FEM-calculations. Combing estimated material properties by experiment with microstructure models offers the possibility to carry out different simulations over different hierarchical levels. In contrast to experiments also the pore network and its influence on global parameter can be analyzed. This approach is carried out on different cellular structures as heterogeneous ceramic foams, homogenous lattice structures and syntactic foams. References B. Ceron-Nicolat, F. Wolff, A. Dakkouri-Baldauf, T. Fey, H. Münstedt, P. Greil: Graded Cellular Ceramics from Continuous Foam Extrusion, 2012, Adv. Eng. Materials, pp , DOI: / adem Ceron-Nicolat, B., Fey, T. and Greil, P.: Processing of Ceramic Foams with Hierarchical Cell Structure, 2010, Adv. Eng. Materials, pp , DOI: /adem Fey, T., Götz, M., Greil, P. Photoelastic imaging of residual stress distribution in epoxy interface layers of ceramics with periodic building-block structure (2013) Advanced Engineering Materials, /adem T. Konegger, J. Torrey, O. Flores, T. Fey, B. Ceron-Nicolat, G. Motz, F. Scheffler, M. Scheffler, P. Greil and R. K. Bordia, Ceramics for Sustainable Energy Technologies with a Focus on Polymer- Derived Ceramics, in Novel Combustion Concepts for Sustainable Energy Development, Eds. A.K. Agarwal, A. Pandey, A.K. Gupta, S.K. Agarwal and A. Kushari, Springer India (December 2014), pp Fey, T., Betke, U., Rannabauer, S. and Scheffler, M., Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization, Adv. Eng. Mater., 2017, doi: / adem Fukushima, M., Fujiwara, T., Fey, T. and Kakimoto, K.-i., One- or two-dimensional channel structures and properties of piezoelectric composites via freeze-casting. J Am Ceram Soc doi: /jace F. Eichhorn, A. Stenzel, B. Weisenseel, N. Travitzky, K. Kakimoto, P. Greil, T. Fey, Porous piezoelectric ceramics with 3-3-connectivity fabricated by impregnation of cellulose paper structures, Materials Letters, 2017, /j.matlet Eichhorn, F., Biggemann, J., Kellermann, S., Kawai, A., Kato, K., Kakimoto, K. and Fey, T. (2017), Influence of Cell Size on Mechanical and Piezoelectric Properties of PZT and LNKN Ceramic Foams, Adv. Eng. Mater., doi: /adem Zierath, B., Greil, P., Stumpf, M., Fey, T., Enforcing of mechanical properties of alumina foams, 2017, Advances in Ceramic Armor, Bioceramics, and Porous Materials: Ceramic Engineering and Science Proceedings Volume 37, Issue 4, ISBN , pp Weisenseel, B., Greil, P., Fey, T. Biomorphous Silicon Carbide as Novel Loop Heat Pipe Wicks, 2017, Advanced Engineering Materials, Volume 19, Issue 1 Zake-Tiluga, I., Svinka V., Svinka, R., Zierath, B., Greil, P., Fey, T. Thermal conductivity and microstructure characterisation of lightweight alumina and alumina-mullite ceramics, Journal of European Ceramic Society (2015), 36, pp T. Fey, F. Eichhorn, G. Han, K. Ebert, M. Wegener, A. Roosen, K. Kakimoto, P. Greil Mechanical and Electrical Strain Response of a Piezoelectric Auxetic PZT Lattice Structure Smart Materials Structure (2016), T. Fey, B. Zierath, P. Greil, M. Potocezk Microstructural, mechanical and thermal characterization of alumina gel-cast foams manufactured with the use of agarose as gelling agent Journal of Porous Materials (2015) Volume 22, Issue 5, Page PL-2 Recent Developments on Piezoelectric Materials Shujun Zhang. ISEM, Australian Institute of Innovative Materials, University of Wollongong, NSW 2500, Australia Piezoelectric materials play an important role in electromechanical applications, such as medical imaging, structural health monitoring (SHM) and nondestructive evaluation. To improve the performance of electromechanical devices, the selection of piezoelectric material with optimized properties is a critical concern. In this presentation, the history and applications of piezoelectric materials have been reviewed, with emphasis on recent developments of piezoelectrics, where the discussion is divided into two parts, i.e., ferroelectric and nonferroelectric materials. Special attention is focused on the temperature dependence of electromechanical properties and related mechanisms of piezoelectric materials, the potential piezoelectric materials for cryogenic and ultra-high temperature applications are also discussed. The uniqueness of relaxor-pt crystals and nonferroelectric piezoelectric crystals are surveyed for possible electromechanical applications. Specifically, relaxor-pbtio 3 single crystals show superior piezoelectric properties, with piezoelectric coefficients of > 2000pC/ N and electromechanical coupling factors of > 90%, far outperforming conventional ferroelectric PZTs, which greatly benefit medical ultrasound imaging [1-3]. Furthermore, good piezoelectric properties are found down to cryogenic temperatures, being on the order of 200pC/N at 20 K [3]. In contrast, nonferroelectric single crystals, such as langasites, oxyborates, melilite and fresnoite crystals, possess ultrahigh electrical resistivity, being on the order of 10 8 Ohm.cm at 500 o C. Though their piezoelectric coefficients fall into single digits, they are promising for high temperature sensing 한국세라믹학회 71

92 2017 년한국세라믹학회추계연구발표회 applications, up to 1200 o C [4,5]. In addition, new development on lead free single crystals is also reviewed. Acknowledgements: This work was supported by ONR, ONRG, NASA and NSF. Also thanks to my colleagues: Prof. T. R. Shrout; Dr. F. Li; D. J. Luo; Prof. L.Q. Chen, Dr. H. Y. Lee; Dr. F. P. Yu; Prof. X. N. Jiang and many other friends. References [1] S. J. Zhang and F. Li, J. Appl. Phys. 111, (2012). [2] S. J. Zhang and T. R. Shrout, IEEE Trans. Ultrason. Ferro. Freq. Control, 57, 2138 (2010). [3] S. J. Zhang, F. Li, X. N. Jiang, J. Kim, J. Luo and X. C. Geng, Progress in Mater. Sci. 68, 1 (2015). [4] S. J. Zhang and F. P. Yu, J. Am. Ceram. Soc., 94, 3153 (2011). [5] X. N. Jiang, K. Kim, S. J. Zhang, J. Johnson and G. Salazar, Sensors, 14, 144 (2014). PL-3 Future Research Direction of Graphene for Real Industrial Applications: Large-Area Single Crystalline Graphene Jae Young Choi. Sungkyunkwan University Graphene has been intensively studied due to its outstanding properties such as quantum electronic transport, extremely high mobility, high elasticity and high mechanical strength. Since the discovery of graphene in 2004, many approaches to synthesize largearea graphene have been developed, including epitaxial growth on silicon carbide, CVD growth on metal substrate as well as metalassisted precipitation method. 1) Most of the large-area graphene developed until now is polycrystalline, having grain boundary which is a scattering center to deteriorate electronic conductivity and mobility of graphene. Therefore, uniform growth of single-crystal graphene over large areas is a fundamental issue to make the commercial-level manufacturability of grapheme for various electronic, photonic, mechanical, and other device applications. In this study, we developed epitaxial nucleation method to successfully grow large-area single crystalline graphene. on the copper substrate by CVD. We devoted to minimize formation of double layer grapheme and eventually could grow large-area multi-layer-free single crystalline graphene via epitaxial growth. We will discuss the multilayer-free growth as well as epitaxial nucleation of single crystalline graphene on copper substrate. Acknowledgement This work was supported by the Technology Innovation Program or Industrial Strategic Technology Development Program ( , Development of Growth and Transfer Technology for Defectless mm 2 Single Crystalline Graphene) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea). Reference 1) Keun Soo Kim et al., Large-scale Pattern Growth of Graphene Films for Stretchable Transparent Electrodes, Nature, Vol. 457, pp , year G1-1 Influence of SrTiO 3 Contents on the Phase Transition Behavior and Mechanical Properties of Bi 0.5 Na 0.5 TiO 3 Lead Free Piezoelectric Ceramics SrTiO 3 함량에따른 Bi 0.5 Na 0.5 TiO 3 세라믹의상변화및기계적물성변화분석 조소라 1*, 홍창효 2, 김대수 3, 강형원 4, 안창원 5, 이형규 4, 남산 1, 조욱 2, 한승호 4. 1 고려대학교, 2 울산과학기술원, 3 호서대학교, 4 전자부품연구원, 5 울산대학교 Bi 0.5 Na 0.5 TiO 3 (BNT) 계소재는 PZT 계소재를대체할수있는무연압전소재로써 EFIPT(Electric field induced phase transition 의특징을갖고있어전계를인가해주면상전이거동에의하여높은변위 (strain) 를갖는것을특징으로한다. 하지만높은변위를얻기위해선높은전계가필요하며이를낮추기위한노력으로 SrTiO 3 (ST) 를첨가하는연구가활발히진행되고있다. 본연구에서는 BNT 에 ST 의함량에따라상변화거동 (Phase transition behavior) 및기계적물성변화를분석하였다. X-ray diffraction 패턴과 field induced polarization 및 strain curve 를통해 ST 함량이증가할수록강유전상과 ergodic relaxor(er) 상이공존하는상으로변화하는것을확인하였다. 임피던스분석을통해다양한모드에서의공진, 반공진주파수를추출하였으며이를기반으로다양한기계적물성값을얻었다. ST 가 25 mol% 첨가된조성에서공진주파수 peak 가뚜렷하게나타나지않아몇몇의 compliance 텐서값들은 ST 함량에따른 compliance 변화거동에서의외삽법 (extrapolation) 법으로구하였다. G1-2 Low Sintering Temperature for Lead-Free BiFeO 3 -BaTiO 3 Ceramics with High Piezoelectric Performance and High Curie Temperature 낮은소결온도를가지는비납계 BiFeO 3 -BaTiO 3 세라믹스의압전및상전이온도특성이명환 1*, 김다정 1, 최해인 1, 김명호 1, 송태권 1, 김원정 1, 도달현 2. 1 창원대학교, 2 계명대학교 The effects of sintering temperature (T S ) were investigated in 0.67Bi 1.05 FeO BaTiO 3 (BF33BT) lead-free piezoelectric ceramics. The BF33BT ceramics were prepared by a solid-state reaction method at various T S followed by a water-quenching process. X-ray diffraction patterns show a single-phase perovskite structure without any secondary phases. The perovskite lattice distortions were found to increase as T S increased. The largest rhombohedral distortion (90 -a R = 0.14 ) and tetragonality (c T /a T = 1.022) were observed in the BF33BT ceramic sintered at 980 C, and its Curie temperature (T C ) was 476 C. This ceramic exhibits good piezoelectric properties with large grains; the piezoelectric charge sensor coefficient (d 33 ) was 352 pc/n and its actuator piezoelectric coefficient (d 33 *) was 270 pm/v. Overall, the high piezoelectric performance and low T S of these BF33BT ceramics indicate their potential as new eco-friendly leadfree piezoceramics compared to other lead-free piezoelectric ceramics, which require relatively high T S of ~ C. G1-3 Enhanced Piezoelectric Properties by Tuning Dielectric Properties in Iron (Fe 2+ ) doped MAPbI 3 Perovskite Thin Films: Flexible Piezoelectric Generators IPPILI SWATHI *, 윤순길. 충남대학교 Organo-metal halide perovskite (OMHP) materials have attracted much more attention due to their outstanding properties for optoelectronic applications such as solar cells with reaching efficiency up to 20% and light emitting diode (LEDs). The main advantage of these class materials is low-cost preparation by solution processing, good charge transport properties, and structural flexibility for optical band gap tuning. Recently many researchers also focused on piezoelectric properties of perovskite and its composites because of ferroelectric 72 한국세라믹학회

93 구두발표 nature. The OMHP has a structure ABX 3 (organic monovalent cation, A; divalent metal, B; inorganic or organic anion, X) and by substituting or doping in ABX 3 structure there is a possibility to tune various properties such as structural, electronic, optical and magnetic properties etc. In present study, we present high performance piezoelectric generator based on iron (Fe 2+ ) doped MAPbI 3. Firstly Fe doped MAPbI 3 thin films were deposited onto the ITO coated PET substrate by one step solution process with different molarity ratios of Pb and Fe. As deposited thin films structure and surface morphology were characterized by XRD and SEM. Phase transition from tetragonal to cubic was observed depending upon the Fe concentration. This leads to huge change in dielectric properties and polarization. Which results the enhanced piezoelectric output performance of the flexible Fe doped MAPbI 3 piezoelectric generators. G1-4 (Na, K)NbO 3 -based Lead-free Piezoelectric Ceramics for Knocking Sensor Application NKN-based의무연압전세라믹을적용한노킹센서김대현 1*, 이태곤 2, 조성훈 1, 남산 1. 1 고려대학교, 2 KU-KIST 융합대학원 Piezoelectric knocking sensors with a dense microstructure were fabricated at low-temperature using various CuO-added NKN, NKN- ST, and NKNS-CT lead-free piezoelectric ceramics. The practical sensitivity (S P ) of the knocking sensor, which is the ability to detect the knocking of a car engine, was influenced by the g 33 k p value of the piezoelectric ceramics, indicating that the g 33 k p can be considered a figure of merit of the piezoelectric ceramics used in the knocking sensor. The knocking sensor synthesized using the CuO-added 0.96(Na 0.5 K 0.5 )(Nb Sb )O CaTiO 3 (CNKNS-CT) ceramic, which showed a g 33 of 25.7 Vm/N and k p of 0.46, exhibited a high S P of 119 mv/g at the resonance frequency. which is higher than the S P value of the commercial PZT-based knocking sensor (112 mv/g at the resonance frequency). Therefore, the CNKNS-CT knocking sensor can be used to replace the PZT-based commercial knocking sensor. G1-5 Flexible Energy Harvesters based on High Piezoelectric Ceramic Nanomaterials 무기압전세라믹나노소재를이용한플렉서블에너지하베스팅소자개발박귀일 1*, 백창연 2, 김도경 2. 1 경남과학기술대학교, 2 KAIST Energy harvesters which can convert electrical energy from vibrational and mechanical energy sources are very promising tools to realize the sustainable energy generation in isolated, inaccessible or indoor environments and even in human body condition. To harvest electrical energy from ambient mechanical energies created by natural sources or from human movements, piezoelectric energy harvesting devices called a nanogenerator (NG) have been proposed and developed by many researchers. Among piezoelectric materials, perovskite-structured ceramic materials have drawn considerable attention due to their excellent inherent ferroelectric and piezoelectric characteristics. Herein, we will describe high-performance and flexible energy harvesting devices fabricated using various fabrication processes with perovskite-structured piezo-ceramic nanomaterials such as BaTiO 3 nanowires, nanoparticles, and nanotubes. G1-6 Relation between Piezoelectric Properties and Output Power of Energy Harvester in (1-x-y)PbZrO 3 -xpbtio 3 -ypb(ni 1/3 - Nb 2/3 )O 3 System (1-x-y)PbZrO 3 -xpbtio 3 -ypb(ni 1/3 Nb 2/3 )O 3 system에서에너지하베스터의압전특성과출력간의상관관계김선우 1*, 이태곤 2, 남산 1. 1 고려대학교, 2 KU-KIST The piezoelectric properties of (1-x-y)PbZrO 3 -xpbtio 3 -ypb(ni 1/3 - Nb 2/3 )O 3 ceramics and their relation with energy harvesting output were investigated. Specimens with a large Pb(Ni 1/3 Nb 2/3 )O 3 content, which have compositions close to the triple point, show small g 33 and d 33 g 33 values because of their large ε T 33/ε 0. These values increased with a decrease in y (amount of Pb(Ni 1/3 Nb 2/3 )O 3 ) and the specimen with x = 0.39 and y = 0.29 which is a rhombohedral structure near the rhombohedral-tetragonal MPB exhibited large g 33 of V m/n and d 33 g 33 of m 2 /N. Cantilever-type energy harvesters were fabricated using specimens with 0.38 x 0.41 and y = The output power densities of the energy harvesters were related to the d 31 g 31 k 312 value of the piezoelectric ceramics. The energy harvester fabricated using a specimen with x = 0.39 and y = 0.29, 2 which has a maximum d 31 g 31 k 31 value, showed the maximum output power density of 1.01 mw/cm 3. G1-7 Evaluation of Interdigitated Piezoelectric Energy Harvester with Trapezoidal Cantilever Beam Trapezoid 캔틸레버빔을이용한 IDE 압전에너지하베스터의평가이민선 1*, 김창일 1, 윤지선 1, 박운익 1, 홍연우 1, 조정호 1, 백종후 1, 박용호 2, 정영훈 1. 1 한국세라믹기술원, 2 부산대학교 An interdigitated (IDE) piezoelectric energy harvester with trapezoidal cantilever beam was fabricated and its energy harvesting performance was evaluated. A commercial soft Pb(Zr,Ti)O 3 (PZT) piezoelectric material with a high d 33 of 520 pc/n was utilized for energy conversion. The IDE pattern printed on the PZT film was applied to longitudinal vibration mode. Detail configuration of the IDE will be introduced. The IDE patterned PZT film was attached on a trapezoidal cantilever beam for low frequency operation. The fabricated IDE piezoelectric energy harvester with trapezoidal cantilever beam exhibited a high power density of 6.9 mw/cm 3 across load resistance of 100 kω at bending resonance frequency of 153 Hz and 1.5 G. This corresponds to a normalized power factor of 10.8 mw/ g 2 cm3. The energy harvesting performance was also compared to that of a piezoelectric energy harvester with trapezoidal cantilever beam driven in transversal vibration mode. G1-8 Effect of Isovalent Substitution on the Microwave Dielectric Properties of Mg 4 Nb 2 O 9 Ceramics Mg 4 Nb 2 O 9 세라믹스의마이크로파유전특성에미치는등가치환효과김정훈 *, 김응수. 경기대학교 Mg 4 Nb 2 O 9 ceramics with corundum structure are attractive materials applicable to 5G communication system due to their high quality factor (Qf ), associated with prominent frequency selectivity at microwave frequencies. The Qf value of Mg 4 Nb 2 O 9 could be enhanced by the substitution of isovalent ions for Nb 5+ site. In this study, dependences of the microwave dielectric properties on the isovalent substitution of (Sn 4+ 1/2W 6+ 1/2) 5+ and (Ti 4+ 1/2W 6+ 1/2) 5+ at Nb 5+ - 한국세라믹학회 73

94 2017 년한국세라믹학회추계연구발표회 sites of Mg 4 Nb 2 O 9 ceramics were investigated. The Qf value of the specimens observed the highest value (274,000 GHz) at x = 0.05 due to the higher average bond valence of Mg 4 Nb 1.95 (Sn 1/2 W 1/2 ) 0.05 O 9 specimen than that of the other specimens. The dielectric constant (K) of the specimens was affected by dielectric polarizability. With increasing x, the K value of specimens was decrease due to the higher dielectric polarizability of Nb 5+ (3.97 Å 3 ) than those of substitution ions such as (Sn 1/2 W 1/2 ) 5+ (3.015 Å 3 )and (Ti 1/2 W 1/2 ) 5+ (3.065 Å 3 ). Relationships between the microstructure and the microwave dielectric properties were also discussed. G1-9 Dependence of Microwave Dielectric Properties on the Electronegativity Difference of MgTi 1-x (Zn 1/3 B 2/3 ) x O 3 (B = Nb 5+, Ta 5+ ) Ceramics MgTi 1-x (Zn 1/3 B 2/3 ) x O 3 (B = Nb 5+, Ta 5+ ) 세라믹스의마이크로파유전특성의전기음성도차이의존성김재민 *, 김응수. 경기대학교 Effects of electronegativity difference on the microwave dielectric properties of MgTi 1-x (Zn 1/3 B 2/3 ) x O 3 (B = Nb 5+, Ta 5+, 0 x 0.1) ceramics was investigated. For the specimens with B = Nb 5+, single phase of ilmenite structure was observed through the entire range of compositions. With increasing (Zn 1/3 Ta 2/3 ) 4+ substitution up to x = 0.075, the single phase of ilmenite structure was detected, however, the secondary phase of MgTi 2 O 5 was observed for further substitution of (Zn 1/3 Ta 2/3 ) 4+. Structural characteristics of the specimens were quantitatively evaluated by applying the Rietveld refinement method to the X-ray diffraction data. With increasing of (Zn 1/3 B 2/3 ) 4+ content, the electronegativity difference was increased and the quality factor (Qf ) was decreased. The specimens with B = Ta 5+ showed higher Qf than those with B = Nb 5+ due to smaller electronegativity difference and higher Ti-site bond strength. Also, the highest Qf value of the specimens was observed at MgTi (Zn 1/3 B 2/3 ) O 3 (B = Nb 5+, Ta 5+ ). G1-10 SWCNTs/TiO 2 Core/Shell Sponge - the Mesoporous Scaffold for TCO Electrode-free Perovskite Solar Cells Tran Van Dang *, 윤순길. 충남대학교 The titanium dioxide (TiO 2 ) was deposited onto single-walled carbon nanotubes (SWCNTs) by nano-cluster deposition (NCD) technology. Most importantly, the supper hollow SWCNTs structure as fabricated directly by arc charge system was full-covered with a thin layer (~15 nm) of TiO 2 forming the SWCNTs/TiO 2 core-shell bundle. Taking advantage of the large surface area, effective in electron transfer from the TiO 2 to SWCNTs. We employ this porous structure as scaffold for light absorber and electron collector in transparent conducting oxide (TCO) electrodes-free Perovskite solar cells (PSCs). By using CVD method and optimizing the condition of CH 3 NH 3 PbI 3 loading in SWCNTs/TiO 2 sponge, which is the hybrid bottom electrode and electron transporter of PSCs, a PCE of 2.9% is achieved. We anticipate that study will lead to further work to develop the low cost and flexible perovskite solar cells. G1-11 Solution-processe d ZTO/Al 2 O 3 Heterostructure for Environmentally Stable Solution-processed Oxide Thin-film Transistors 용액법 ZTO/Al 2 O 3 이종접합구조를적용한높은환경적안정성의산화물박막트랜지스터 조성운 *, 김경수, 정성현, 조형균. 성균관대학교 For solution-processed oxide thin-film transistor (TFT) integration with long-term environmental reliability, we designed sol-gel processed ZnSnO (ZTO)/Al 2 O 3 heterostructure and chemically-stable sol-gel fabrication strategy. Here, the ZTO semiconductor with chemically high durability is assigned as an effective electron transport layer. The earth-abundant Al 2 O 3 is employed as a gas barrier layer against the absorption of gas molecules (H 2 O and O 2 molecules) on back-channel region without disturbing electron transport between S/D electrodes and channels. In order to minimize inevitable chemical attack from acidic/basic precursor solutions for sol-gel processed heterostructure construction, chemically-stable sol-gel ZTO/Al 2 O 3 stacking was achieved with chemically durable Sn-modulated ZTO semiconductor and weak-corrosive ph-engineered Al 2 O 3 precursor solution. Finally, rare-metal free oxide-based semiconductor/insulator heterostructure channel and chemically-stable multi-stacking strategy realized sol-gel processed oxide TFT with excellent humid-air, temperature, bias, and photo reliability. G1-12 Design of High Performance Cu 2 O based Photoelectrochemical Cell: Buffer Layer for Crystal Growth Direction and Thermal Treatment for Charge Transfer Cu 2 O 기반고효율광전기화학셀디자인 : 버퍼층을활용한결정성제어및전하수송향상을위한후처리공정백승기 *, 윤영대, 조형균. 성균관대학교 Cuprous oxide (Cu 2 O), natively a p-type oxide, is a suitable photocathode for hydrogen evolution because of its adequate direct band gap of 2 ev, which can absorb a significant part of the solar spectrum, and favorable energy band position, with the conduction band lying at 0.7 V of the hydrogen evolution potential. Nevertheless, Cu 2 O have critical limitations in terms of high PEC performance. First, Cu 2 O films are chemically unstable because of a self-photodegradation mechanism. Second, the Cu 2 O films generally exhibit low electrical conductivity and short minority-carrier diffusion lengths, which cause low photocurrents because of frequent nonradiative recombination. To enhance the PEC properties of photocathode Cu 2 O layers, particularly their photocurrent and stability, the preferential crystal orientation, which is strongly linked to the electrical conductivity and chemical stability of the Cu 2 O film, must be artificially controlled. Furthermore, to improve the charge transfer, the additional layer on the absorber is necessary. In this study, we deposited Cu 2 O absorber layer with electrodeposition on the Cu 2 O:Sb seed layer which has extremely high crystallinity. Then we progressed the post thermal treatment to obtain the CuO thin film having an adequate thickness which does not interfere with PEC performance. The PEC properties of our Cu 2 O based three layer structure samples were analyzed by various electrochemical measurement such as capacitance-voltage and impedance spectroscopy. G1-13 Pourbaix-diagram based Back-channel Wet-etch Process Design for Solution-processed Oxide Thin Film Transistors Circuit Integration 용액법산화물박막트랜지스터회로구성을위한포베이다이그램기반의백채널습식에칭공정디자인 74 한국세라믹학회

95 구두발표 조성운 *, 김경수, 정성현, 조형균. 성균관대학교 A Pourbaix diagram based back-channel wet-etch (BCWE) process was designed for the circuit integration of solution-processed oxide thin film transistors (TFTs). First, Pourbaix diagrams and phdependent corrosion behaviors of representative oxide channels and metals were considered to design criteria to seek an optimal ph value of a wet-etchant so as to simultaneously realize a chemically-stable state of an oxide channel and active ionization of metal electrodes. Next, a Pourbaix diagram based BCWE process using the customized wet-etchant with optimal ph was demonstrated on a solutionprocessed oxide TFTs with a back-channel etch (BCE) structure that consisted of ternary oxide channels [ZnSnO (ZTO) and InZnO (IZO)] and common metal electrodes (Mo and Mo/Cu). Thick-Mo and thin- Mo/thick-Cu electrodes could be completely ionized without any metal oxide residues in middle-basic (ph 10) and weak-acidic (ph = 6) wet-etchants, respectively. Chemically durable ZTO in the broad ph region (6 ph 11) indicated sufficient potential as channel candidates for the circuit integration of chemical damage-free oxide TFTs as opposed to IZO (ph = 10). Finally, solution-processed ZTO TFTs could be fabricated with wet-etched common electrodes (Mo and Mo/Cu) via a Pourbaix diagram based BCWE process using the customized wet-etchant condition (ph = 10 and 6) without electrical degradation (current-drop, hump phenomena, or instability. G1-14 Synthesis and Microwave Absorbing Property of Znsubstituted Sr W-type Hexaferrite Zn가치환된 Sr W-타입헥사페라이트의합성과마이크로파흡수특성유재형 *, 최성준, 이선우, 유상임. 서울대학교 Strontium W-type hexaferrite (SrFe 18 O 27, SrW) is a ferromagnetic material possessing high saturation magnetization (M s ) and high anisotropy field (H a ) values. Recently, due to its high ferromagnetic resonance frequency, W-type hexaferrite has attracted attention for microwave application especially for microwave absorber in the high frequency range of 8-40 GHz. In this report, we tried to prepare SrZn x Fe 2-x Fe 16 O 27 (SrZn x Fe 2-x W, where 0.0 x 2.0) polycrystalline samples in a reduced oxygen atmosphere, and identify the effect of Zn substitution on their magnetic and microwave absorbing properties. For these purpose, the samples with different x values were annealed at the temperature region of o C for 2 h in the PO 2 of 10-3 atm. Static and dynamic magnetic property measurements revealed that H a value of the samples decreased with increasing x from 0.0 to 1.0, while M s value increased with increasing x value. And also, with increasing x value, real and imaginary permittivity of SrZn x Fe (2-x) W increased while real and imaginary permeability values were not changed significantly. Furthermore, impedance matching conditions for microwave absorbing property was obtained with the measured permittivity and permeability values by using impedance matching solution map. As a result, SrZn x Fe (2-x) W samples exhibited narrowbanded microwave absorption higher than -20dB in the frequency range of GHz. Detailed properties of SrZn x Fe (2-x) W will be presented for a discussion. G1-15 The Study on Contamination and Recovery Properties of in-situ Growth Graphene using Ti Buffer Layer Ti층위에직접성장된그래핀의오염과회복특성연구박병주 *, 윤순길. 충남대학교 Direct graphene growth on functional substrates via chemical vapor deposition is an attractive approach to manufacturing flexible electronic devices, as it avoids the drawbacks of transferred graphene. To fabricate flexible devices on plastic substrates, the growth temperature must be below ~200 C to prevent substrate deformation. Another issue is contamination of graphene in air. Adsorption of H 2 O and hydrocarbon on graphene surface makes the unwanted effects such as electrical property degradation. For transfer free graphene growth, we show that defect-free graphene can be grown on a variety of substrates via the introduction of an ultra-thin titanium buffer layer, due to perfect lattice matching between titanium and carbon atoms. We report theoretical and experimental evidence for high-quality graphene grown on titaniumbuffered substrates at 150 C in a CH 4 /H 2 atmosphere. And in-situ graphene is exposed in air for 1week, we check the sheet resistance and mobility of graphene. For recovery of graphene, degraded graphene is annealed in Ar, N 2 and vacuum using RTA. G1-16 High Performance Antibacterial Activity and Capacitor using ZnAl 2 O 4 Thin Film by RF Sputtering ZnAl 2 O 4 박막을이용한항균필름및캐패시터소자특성평가최형진 *, 윤순길. 충남대학교 Modern society has damaged by various types of bacteria and viruses occur, such as Staphylococcus aureus, Salmonella, and E. coli, are living while touching in our life. To prevent these hazards, a varieties of antibiotics and drugs have been developed for eliminated the disease caused by microbial infection. Recently, the environmental problems have been raised by the Silver ions released in the water from antibacterial products. Therefore, instead of Ag NPs, most studies have focused mainly on Zn based materials to accomplish an antibacterial effect. In this study, the ZnO based films showed strong antibacterial activity more than 99.99% against E. coli and S. aureus bacteria by film attachment method (JIS Z 2801). Al amount in ZnO increasing over than 50 at%, ZnO phase is changed to ZnAl 2 O 4. This study discusses the capacitance properties of ZnAl 2 O 4 thin films and the mechanism of their antibacterial activity. In addition, Al doped ZnO (AZO) multi-layer thin film was deposited onto Polymer substrate as electrode and ZnAl 2 O 4 materials for preparation of transparent and flexible capacitor device. G1-17 Electrical Properties of Flexoelectric Device using Eco- Friendly LDH Nanosheet by CO 2 in Water for Atmospheric CO 2 Reduction 물을이용하여공기중의 CO 2 농도를감소시킬수있는친환경 LDH Nanosheet 제조공정및 LDH 를이용한 Flexoelectric 소자의특성평가엄지호 *, 최형진, 윤순길. 충남대학교급속한산업화로인한대기중이산화탄소농도의증가는온난화등여러문제의원인이되고있다. 대기중의이산화탄소를줄이는방법은크게두가지를이야기할수있는데첫번째는대기중의이산 한국세라믹학회 75

96 2017 년한국세라믹학회추계연구발표회 화탄소를직접적으로포집하는방법으로 Carbon capture and storage (CCS) 가대표적이다. 또다른방법으로는대기중으로방출되는이산화탄소의양을줄이는방법으로에너지하베스팅등의친환경발전방식이대표적이다. 우리는 Al doped ZnO(AZO) 박막과물속의이산화탄소를이용하여수직방향으로자라는 Layered double hydroxide(ldh) nanosheet 를만들었으며이 LDH 가 nonsolid 층이포함된층상구조로서 Strain gradient 가생기기쉬운 symmetry 한구조를가지고있기때문에, 이를이용하여 Flexoelectric 효과를이용한에너지하베스팅소자를만들수있다는예측을하였다. 본연구에서는 Al 도핑양에따른 AZO 박막의 LDH nanosheet 형성형태를확인하고 LDH 가만들어지는최적의조건을찾을것이다. 또한이렇게만들어진 LDH 를이용한 Flexoelectric 에너지하베스팅소자의특성을확인할것이다. S11-1 Behavior of Templates during Texturing of Piezoelectric Ceramics 압전세라믹스의결정배향중템플레이트의거동전재호 *, 차현애. 재료연구소 Lead-free ceramics have been receiving especial attentions as promising piezoelectric materials to replace Pb(Zr,Ti)O 3 (PZT)-based piezoelectric ceramics. Although Bi 0.5 (Na,K) 0.5 TiO 3 (BNKT)- and (K,Na)NbO 3 (KNN)-based ceramics are reported to be promising for piezoelectric applications, their piezoelectric properties must be further improved before they can replace PZT. The piezoelectric properties of BNKT- and KNN-based ceramics can be improved by controlling the grain orientation through texture engineering using anisotropic templates with plate-like shapes. Through the growth of aligned templates, texture engineering can produce samples containing grains aligned along certain crystallographic orientations instead of randomly distributed matrix grains. One of the most important parameters in texture engineering is the role of the template. Plate-like Bi 4.5 Na 0.5 Ti 4 O 15 (BNT15) (or Bi 0.5 Na 0.5 TiO 3 ) and NaNbO 3 (NN) are generally used as templates for texturing of BNKT and KNN ceramics, respectively. These templates are prepared by the moltensalt method followed by the topochemical microcrystal conversion (TMC) process. In this study, we investigated the role and behavior of templates in texture engineering of BNKT- and KNN-based lead-free piezoelectric ceramics. S11-2 Domain Engineering of Textured Bi 0.5 (Na,K) 0.5 TiO 3 -based Ceramics 입자배향된 Bi 0.5 (Na,K) 0.5 TiO 3 -계세라믹의도메인제어안창원 1*, 최강호 2, 강우석 2, 조욱 2, 이재신 1. 1 울산대학교, 2 울산과학기술원 Recently developed lead-free incipient piezoceramics are promising candidates for off-resonance actuator applications with their exceptionally large electromechanical strains. Their commercialization currently faces three critical challenges: high driving electric field required for delivering the potentially available large strains, large strain hysteresis inappropriate for precision devices, and relatively large temperature dependence. Textured Bi 0.5 (Na 0.78 K 0.22 ) 0.5 TiO 3 -baed ceramics were fabricated by reactive templated grain growth (RTGG) method with the viewpoint of improving the strain response and reducing the driving electric field from grain orientation. Textured BNKT-based ceramcis show high orientation factor (lotgering s factor), and exhibited large strain values at relatively lower applied electric field, which corresponds to a normalized strain (S max /E max ) of > 1000 pm/v. We found that the crystallographic orientation of textured ceramics could be adjusted depending on the kind of seed particles. The crystallographic orientation of the direction perpendicular to the casting direction for textured BNKT-based ceramics by Na 0.5 Bi 4.5 Ti 4 O 15 seed particles are <200> instead of [002] that is commonly aimed at for tetragonal systems during RTGG process. In this study, we studied the anisotropic electrical properties of the textured BNKT-based ceramics by constraining polarization to the inplane direction to casted surface. S11-3 Structural and Piezoelectric Properties of <001> Textured PZT-PZNN Piezoelectric Ceramics 배향된 PZT-PZNN 압전세라믹의구조및압전특성남산 *, 이태곤. 고려대학교 Rhombohedral 0.69Pb(Zr 0.47 Ti 0.53 )-0.31Pb(Zn 0.6 Ni 0.4 )NbO 3 (PZT- PZNN) ceramics were textured using 10.0 vol.% BaTiO 3 (BT) platelets along the <001> direction at 950 o C with a high Lotgering factor of 95.3%. BT platelets did not react with the PZT-PZNN ceramics, and the textured PZT-PZNN ceramic had a tetragonal structure. The PZT-PZNN ceramics exhibited a strain of 0.174% with a piezoelectric strain constant (d * 33) of 580 pc/n at 3.0 kv/mm. The textured PZT-PZNN ceramic showed an increased strain of 0.276% and d * 33 of 920 pc/n at 3.0 kv/mm, which can be explained by the domain rotation. However, the d 33 values of the textured specimens are smaller than those of the untextured specimens because of the small remanent polarization and relative dielectric constant of BT platelets. The textured PZT-PZNN ceramic synthesized in this work can be used for piezoelectric multilayer actuators because of its large strain and low sintering temperature. S11-4 Over 1 mw Powering Magnetic Energy Harvesting by Piezoelectric Single Crystal and Textured Magnetostrictive Alloy Laminate Composites 류정호 1*, 윤운하 1, 황건태 1, 정대용 2. 1 재료연구소, 2 인하대학교 Energy Harvesting devices are expected to play a crucial role in the development of next-generation wireless sensor networks (WSN), because the dependence on conventional batteries may become a limiting factor for IoT electronics in terms of life time. We are always surrounded by undetectable magnetic noise fields, induced by electric power transmission lines and electric devices, which are essentially wasted energy. The question is how we can make this energy be useful energy for such applications? Typically an electromagnetic generator composed of bulky magnetic cores and bundle of coils is used. Unfortunately, it is too heavy, too large, and their efficiency is too low for practical IoT applications. A Mangeo-Mechano-Electric (MME) generator utilizing Magnetoelectric (ME) Coupling of piezoelectric and magnetostriction and magnetic interaction of magnet mass is introduced recently and it may have promise for this, but it has been challenging to harness the full potential of weak and low-frequency stray magnetic noise by using traditional ME composites, owing to the limited magnitude of ME coupling. To address these issues, a highperformance textured magnetostrictive Fe-Ga alloy sheet and 76 한국세라믹학회

97 구두발표 piezoelectric single crystal PMN-PZT fibers was laminated and adapted to a MME. The designed MME generator can operate various kinds of devices such as a smart watch with IoT sensors, a tiny quadrotor drone, and LED sign board by converting ubiquitous magnetic noise field. S11-5 High Performance Generation III Piezoelectric Single Crystals: Lead-based and Lead-free 고효율제 3 세대압전단결정개발 : 연계및무연계이호용 1*, 김동호 2, 오현택 2. 1 선문대학교, 2 ( 주 ) 세라콤 Crystallographically engineered Relaxor-PT single crystals, specifically PMN-PT and PZN-PT, offer much higher piezoelectric and electromechanical coupling coefficients (d 33 > 1,500 pc/n, k 33 > 0.9), when compared to PZT ceramics (d 33 ~ 600 pc/n, k 33 ~ 0.75). Therefore, the high performance piezoelectric single crystals have been expected to replace polycrystalline PZT ceramics in many application fields such as ultrasound transducers (medical and NDA), SONAR transducer, piezoelectric actuators, piezoelectric sensors, ultrasonic motors and piezoelectric energy harvesting, etc. Recently the solid-state single crystal growth (SSCG) technique has been successfully developed for fabricating the high performance piezoelectric single crystals: lead(pb)-based [PMN-PT and PMN- PZT] as well as lead-free [BaTiO 3, NBT-BT and BTZ-BCT]. Since the SSCG process is quite simple and similar to conventional sintering process, compared to conventional single crystal growth methods such as flux and Bridgman methods, it is very cost-effective and suitable to mass production. In this presentation the recent progress on development of three generations of high performance piezoelectric single crystals ( leadbased and lead-free ) will be introduced: especially high performance generation III piezoelectric single crystals of high electromechanical coupling coefficients (k 33 > 0.94) and piezoelectric constant (d 33 > 3,000 pc/n). S11-6 Self-Growth of Single Crystal in (K,Na)NbO 3 -based Piezoelectric Ceramics 조성디자인을통한 (K,Na)NbO 3 계열재료의단결정성장안철우 1*, 조경훈 2, Attaur Rahman 1, 류정호 1, 최종진 1, 김종우 1, 윤운하 1, 최준환 1, 박동수 1, 한병동 1. 1 재료연구소, 2 금오공과대학교본발표에서는조성디자인을통한 (K,Na)NbO 3 [KNN] 계열압전재료의단결정의성장에대해소개하고자한다. KNN 계열압전재료는별도의 seed를사용하지않고단결정을성장시킬수있는데, 이는비정상입성장을촉진시킴으로써가능하다. BaTiO 3, SrTiO 3 등의페롭스카이트구조를보이는소재들의경우, 적정비율의도너를첨가함으로써비정상입성장이유도되는현상이널리알려져있다. 이와같은비정상입성장의촉진을이용하면, KNN 계열압전재료에서는수 cm 크기의결정립 ( 단결정 ) 을키울수있다. 본발표에서는단결정을성장시킬수있는조성디자인규칙뿐만아니라, 디자인된조성을사용하여간단한 Molten Salt Synthesis 를통해제조된 template 형태의분말에대해서도소개한다. S12-1 Highly Efficient Halide Solar Cells Based on Formamidinium Lead Iodide Formamidinium Lead Iodide 기반고효율할로겐화물태양전지노준홍 *. 고려대학교 페로브스카이트결정구조를갖는할로겐화물은최근태양전지의광활성층소재로크게주목받고있다. 지난 5 여년간급격한효율향상을통하여현재 22% 수준의광전변환효율을보이고있다. 이러한고효율은할로겐화물이갖는적절한밴드갭, 큰광흡수계수, 작은엑시톤결합에너지, 높은전하이동도등의고유한물질특성에서기인한다. 초기할로겐화물은 methylammonium 을기반으로하는 CH 3 NH 3 PbI 3 조성을위주로개발되어왔으니최근고효율소자의경우 formamidinium 을기반으로하는 HC(NH 2 ) 2 PbI 3 조성으로연구가되어오고있다. 본발표에서는고효율페로브스카이트태양전지제작을위한 HC(NH 2 ) 2 PbI 3 할로겐화물의조성제어, 박막화공정, 결함제어방법에대해논의하고자한다. S12-2 Theoretical Study on the Phase Stabilization of Organicinorganic Hybrid Perovskites by the Compositional Engineering 조성엔지니어링을이용한유무기페로브스카이트의상안정도조절메커니즘에관한이론적연구김형준 1*, 전지원 1, 엄태대형 1, 홍기하 2. 1 한국과학기술원, 2 한밭대학교 Along with its unprecedentedly rapid improvement of photo conversion efficiency up to > 20%, perovskite solar cells (PSCs) have been attracting many attentions as a next-generation solar cell material. FAPbI 3 (formamidinium lead triiodide) is particularly considered as an optimal material due to its proper band gap of 1.48 ev that is close to 1.34 ev of Shockley-Queisser limit; however, the competitive polymorphic growth of perovskite ( ) and non-perovskite ( ) phases is the major hurdle in utilizing this material. In our recent work study, we first calculate a dual-site alloying phase diagram showing the relative thermodynamic stability of - and -phases during the simultaneous A- and X-sites engineering using first-principles based energetics from density function theory (DFT) calculations combined with statistical average on the configurational space. Based on the obtained phase diagram, we discuss how the compositional engineering can pave a route to control the polymorphic growth by maintaining the good miscibility, thermodynamic stability, and optimal band gap property of FAPbI 3. Toward designing PSCs with high efficiency and stability, we hope this work to provide a guideline on compositional engineering of organic-inorganic hybrid perovskite alloys. S12-3 Interfacial Issues for Improving Performance of Perovskite Solar Cells 페로브스카이트태양전지에서의계면이슈정현석 *. 성균관대학교 All solid-state solar cells based on organometal trihalide perovskite absorbers have already achieved distinguished power conversion efficiency (PCE) to over 22% and further improvements are expected up to 25%. To commercialize these great solar cells, there are many bottlenecks such as long term stability, large scale fabrication process, and environmental issues. In this presentation, we introduce our recent efforts to facilitate commercialization of perovskite solar cells. For examples, we introduce a recycling technology of perovskite solar cells, which will facilitate the commercialization as well as solve the environmental issues of perovskite solar cells. Moreover, Br-concentration gradient perovskite materials were realized by using HBr treatment of 한국세라믹학회 77

98 2017 년한국세라믹학회추계연구발표회 perovskite materials. The enhancement in hole extraction was verified from measurement of photoluminescence spectroscopy. Also, we are going to discuss about stability issue of perovskite materials regarding charge generation and extraction. S12-4 Tin (Sn)-based Metal Oxides as an Efficient Electron Transporting Material for Perovskite Solar Cells 페로브스카이트태양전지를위한주석기반산화물전자수송층합성및응용신성식 *. 한국화학연구원 Although perovskite solar cells (PSCs) can have power conversion efficiencies (PCEs) exceeding 20%, they can have limited stability under ultraviolet irradiation and application to flexible devices. This is in part because the TiO 2 used as an electron-transporting layer (ETL) has unwanted photocatalytic reaction with perovskite, low mobility, and high processing temperature. Therefore, it is critical issue to explore new metal oxide ETLs for efficient and stable PSCs. In this study, we focus on synthesis and applications of tin (Sn)-based metal oxides (e.g., SnO 2, Zn 2 SnO 4 and BaSnO 3 ) as an alternative to TiO 2 in PSCs. First, new approach to synthesize Sn-based metal oxides at low temperatures below 150 C is developed by designing new intermediate phase, and its plausible synthesis mechanism is proposed. Additionally, the synthesized Sn-based metal oxides are employed as an ETL in PSCs and flexible PSCs. We show that this materials can be implemented to fabricate high-performance, stable PSCs on rigid and flexible plastic substrates. S12-5 Next Generation Light-Emitting Materials: Metal Halide Perovskites Himchan Cho, Young-Hoon Kim, Su-Hun Jeong, Min-Ho Park, Hobeom Kim, Tae-Woo Lee *. Seoul National University Metal halide perovskites are emerging high color-purity emitters with low material cost. However, low electroluminescence (EL) efficiency at room temperature is a challenge that should be overcome. Here, we present efficient perovskite light-emitting diodes (PeLEDs) using various strategies to overcome the EL efficiency limitations where the perovskite layers are in forms of (1) 3D crystal structures, (2) quasi- 2D crystal structures and (3) nanoparticles (NPs). First, to improve EL efficiency of PeLEDs based on 3D crystal structures, we introduced a self-organized buffer hole injection layer to reduce the hole injection barrier and block the exciton quenching at the interface. The highefficiency methylammonium lead bromide (MAPbBr 3 ) and CsPbBr 3 PeLEDs were realized based on the buffer hole injection layers and the temperature dependence of EL in the CsPbBr 3 PeLEDs was systematically investigated and related with ion migration, EL quenching pathways and electron-phonon coupling. Furthermore, we found that the formation of metallic lead atoms causes strong exciton quenching, and it was prevented by finely increasing the molar proportion of MABr in MAPbBr 3 solution. Also, we suggest that the efficiency in PeLEDs can be increased by decreasing MAPbBr 3 grain sizes and consequently improving uniformity and coverage of MAPbBr 3 layers. Using these strategies, a high-efficiency PeLEDs was realized (current efficiency = 42.9 cd/a). High-efficiency flexible MAPbBr 3 PeLEDs based on graphene anode were also developed for the first time. Chemically inert graphene avoids quenching of excitons by diffused metal atom species from indium tin oxide. Second, quasi- 2D perovskites were studied because of the advantages of quasi-2d perovskites such as the enhancement of film quality, exciton confinement and reduced trap density, and quasi-2d PeLEDs with high efficiency and brightness were demonstrated. Finally, perovskite NPs were studied because they can show high luminescence efficiency and high color-purity in both solution states and film states, and high efficiency PeLEDs based on MAPbBr 3 and formaminidium lead bromide (FAPbBr 3 ) NPs were also fabricated. Keywords: organic/inorganic hybrid perovskites, light-emitting diodes, high color purity, nanocrystals S12-6 Emerging Memory Devices Based on Metal Halide Perovskites 할라이드페로브스카이트소재기반차세대메모리소자이장식 *. 포항공과대학교 Emerging nonvolatile memory technologies have been investigated as next-generation technology to replace conventional flash memory. Among them, resistive switching memory (RSM) has been extensively studied for nonvolatile memory applications owing to its excellent retention, endurance, and high on/off ratio. Furthermore, RSM has a simple two-terminal structure, fast switching speed, and low power consumption with excellent scalability. RSM cells can be integrated into a cross-point array to obtain an area-efficient structure. In addition to planar cross-point arrays, 3D stackable cross-point arrays have been recently considered to maximize the RSM density. Among various materials for use in RSM inorganic metal oxides have been investigated widely. Recently, active research has been done on the fabrication and characterization of RSM utilizing hybrid organicinorganic perovskite materials. In this presentation, a strategy toward design of high-density memory devices utilizing metal-halide perovskite materials will be discussed in detail with an emphasis on practical applicability, scalability, and reliability. S13-1 Intrinsic Properties of LaCoO 3 from First-Principles Density Functional Theory Calculations 밀도범함수이론계산을이용한 LaCoO 3 의특성이해이동화 *. 포항공과대학교고체산화물연료전지 (SOFC) 는높은에너지전환효율과장기간안정성, 연료의유연성, 낮은발열, 비용적측면의이점등으로인해차세대신재생에너지로써각광받고있다. SOFC의 cathode로는높은이온전도성과전기전도성을갖는 LSCF(La x Sr 1-x Co y Fe 1-y O 3 ) 가주로사용되고있다. 하지만, LSCF를양극으로이용한 SOFC 의장기적인안정성문제는 SOFC가상용화되는데있어큰걸림돌이되고있다. 따라서 LSCF의우수한물성을이해하고이를바탕으로장기적안정성이확보된새로운 Cathode 물질을개발하는것은 SOFC를상용화하는데있어서매우중요한문제이다. LSCF 의물성을이해하기위해서는먼저 LCO의물성에대한이해가선행되어야만한다. 따라서, 이연구에서는밀도범함수계산을이용하여 LCO가가지고있는자기적성질과전기적성질의상관관계에대해연구를진행하였다. 또한, LCO 시스템내에존재하는고유결함의종류및안정성에대한이해를진행하였다. 이러한연구결과는추후 Sr과 Fe이도핑된 LSCF의물성변화를이해하고조절하는데있어서초석이될것이다. 78 한국세라믹학회

99 구두발표 S13-2 Configurable Topological Textures in Ferroelectric Nanoplates 강유전나노구조체에서의구성가능한위상학적텍스쳐양찬호 *. 한국과학기술원 Topological defects in matter are a topic of intense interest in contemporary condensed matter physics. In particular, vortices and skyrmions in ferroic materials have received considerable attention as topologically protected quasi-particles that carry energy and information. These energetically quantized and spatially confined excitations behave collectively to form highly non-trivial structures called topological textures that are characterized by conserved quantities such as the winding number. Despite the identification of electric vortex structures, electric switching of competing vortex textures in dielectrics with deterministic configurability of the topological number remains experimentally unconfirmed. Here, we show that an epitaxial ferroelectric square nanoplate of bismuth ferrite enables five discrete levels for the ferroelectric topological invariant of the entire system. The total winding number of the topological texture can be configured from 1 to 3 by selective non-local electric switching of the quadrant domains. By using angle-resolved piezoresponse force microscopy in conjunction with local winding number analysis, we directly identify the existence of vortices and anti-vortices, observe pair creation and annihilation, and manipulate the net number of vortices. Our findings offer a useful concept for the stabilization and control of ferroelectric vortices for multi-level topological defect memory. S13-3 Vanadium Oxide Thin Films for Microbolomer 마이크로볼로미터를위한바나듐산화물박막백승협 *. 한국과학기술연구원 Infrared sensors, detecting temperature changes of the things or environment, can provide vital information of health, security, safety, and medical diagnosis. The low-power consumption, low-cost, longtime reliability, resistance, and miniaturization are required. In this sense, microbolometer is a promising technology as it can simply detect an infrared by electrical resistance change at room temperature. For infrared-sensing materials, temperature coefficient of resistance (TCR) should be low to improve the sensitivity while resistivity high to enhance the signal-to-noise ratio. The thermal stability is also critical for the reliability and high-temperature operation. Moreover, the low-temperature growth (< 350 o C) is necessary for the integration to the ROIC. In this work, we successfully fabricated single-phase vanadium oxide thin films that satisfies all the requirements discussed above. Our result paves the way to expand the application of microbolometers to a wide range of IoT that was prevented by the limited performance and reliability of previous technologies. S13-4 VO 2 Phase Transition Dynamics through Designed Heterostructures 이종구조디자인을통한 VO 2 상전이현상연구이대수 *. 서울대학교 P hase transitions in correlated materials promise emerging physical phenomena and functions, and usually show couplings between multiple order parameters. These coupled phase transitions can exhibit an exotic and technologically beneficial phenomenon, distinct from that in conventional materials. However, it still remains elusive to explore and control such exotic phase transitions, especially in real time and at the nano-/atomic scale. Here, I present a couple of breakthrough findings on the exotic phase transitions in an archetypal correlated material vanadium dioxide (VO 2 ). (1) Through a combination of phase-field modeling, template-controlled thin-film epitaxy, and in situ transmission electron microscopy, we reveal a protected phase transition of VO 2 that persists undisturbed by preexisting structural domain boundaries. This originates from a large interfacial energy at the coupled structural and electronic phase boundaries, and allows much enhanced metal-insulator transitions in template-controlled VO 2 films. (2) I also design and demonstrate an isostructural, purely electronically-driven metal-insulator transition in artificial heterostructures of VO 2, whose metal-insulator transition should otherwise be coupled to a large structural distortion in bulks. These findings offer new insight for understanding and utilizing the phase transitions in correlated materials. S13-5 Improving Activity of TiO 2 Photcatalyst by Controlling Impurities and Dopants 결함과불순물제어를통한 TiO 2 광촉매개질연구김승철 *. 한국과학기술연구원 TiO 2 는현재거의유일하게상용화된광촉매지만밴드갭이커서광효율이높지는않아서이를개량하려는연구가다양하게진행되고있다. 본발표에서는광흡수율을높이는방향과 rutile과 anatase 혼합상을만들어전자-양공분리효율을높이방향의연구에서 W, N, Sn 불순물의영향을밀도범함수계산과실험검증연구를소개한다. 특히, N 첨가시광흡수율과광촉매효율사이의어긋난상관관계와 Anatase-to-rutile transformation (ART) 의촉진제인 Sn을이용하여 10 nm 정도크기의혼합상나노입자를제작하는것에대해논의한다. S13-6 Polar Octahedral Rotation and Multiferroicity in the Bilayer Iridates 이층구조이리듐산화물에서의극성팔면체찌그러짐과다강성김충현 *. 기초과학연구원 Most perovskite oxides undergo octahedral rotation which strongly influence other electronic, magnetic, and orbital degree of freedom in perovskites and related materials. Hybrid improper ferroelectricity is described by trilinear coupling of two types of octahedral rotation in A-site ordered perovskites or n=2 Runddlesden-Popper structures. Polar octahedral rotation consequently have the potential to realize new multifunctional materials with strong magnetoelectric coupling. Here we propose and demonstrate hybrid improper ferroelectricity appearing in bilayer perovskite iridates Ca 3-x Sr x Ir 2 O 7 from firstprinciples density-functional-theory calculations. Its similarity to parent compound cuprates of high-temperature superconductor makes iridates a good candidate for exploring unconventional superconductivity upon carrier doping. And d-wave charge gap by electron doping was observed by several experiments. In this regards, controllability of magnetism could provide a new opportunities to study superconductivity. Our proposal provide novel route to control magnetism via polar octahedral rotation. 한국세라믹학회 79

100 2017 년한국세라믹학회추계연구발표회 S13-7 Growth and Characterization of SrFeOx Epitaxial Thin Films SrFeOx 에피박막의성장과특성평가최우석 *. 성균관대학교 Strontium ferrite (SrFeO x, SFO) exhibits a rich x-dependent electronic and magnetic phases, ranging from an antiferromagnetic insulating to a ferromagnetic metallic phase. By decreasing x (or increasing oxygen vacancy concentration) from nominal 3.0 (perovskite) to 2.5 (brownmillerite), the valence state of Fe changes from 4+ to 3+, which greatly influences the material s crystal and electronic structures. In the first part of the talk, we will discuss about topotactic phase transformation of SrFeO x epitaxial thin films studied by real-time spectroscopic ellipsometry. The topotactic phase transformation illustrates strong correlation among defect concentration, atomic and electronic structure. A pressure-temperature phase diagram of topotactic phase transformation is constructed and discussed in terms of thermodynamic calculation. In the second part, we will present thermodynamic control of crystallographic orientation of the anisotropic brownmillerite SrFeO 2.5 thin film on SrTiO 3 substrate. The anisotropic electronic and phonon structures are discussed based on the layered crystal structure and orbital dependent optical transitions. In the third part, the brownmillerite SrFeO 2.5 thin film is examined if it can break the inversion symmetry due to a specific ordering of rotated FeO 4 tetrahedral units. This might lead to a structural ferroelectricity in the material, which can be confirmed by different experimental approaches. S13-8 Photoactive Metal Oxide Thin Film Nanostructures Synthesized by Aqueous Solution Processes 수용액공정기반광활성나노구조산화물박막합성장호원 *. 서울대학교기능성산화물박막은반도체소자의활성층및절연층, 디스플레이와태양전지의투명전극및센서소재로널리이용되고있다. 고순도이면서나노미터수준에서박막두께제어가필요한반도체분야와달리에너지환경분야에적용되는기능성산화물박막은친환경적인용액공정법으로도원하는물성을얻을수있기때문에고진공장비의도움없이합성이가능하다. 용액내에서산화물박막을합성하게되면원료의낭비가적고고진공이필요없어생산단가가매우낮으며대면적으로합성도용이하다는장점이있다. 본발표에서는전착및수열합성을이용하여우수한광특성을가지는 BiVO 4, Fe 2 O 3, Cu 2 O 및 NiO 등과같이다양한조성의산화물반도체박막이형성이가능함을소개된다. 펄스전착을이용할경우다공성 3차원구조에서도균일한막형성이가능하다는것을제시하고, 펄스전압과시간을조절할경우박막의형상제어가가능함을보여주고자한다. 전착으로형성된산화물박막을이용하여우수한특성의물분해광전극제조가가능하다는결과가발표된다. 전착외에도수열합성을통해나노구조산화물박막이형성가능함이제시되고, 수용액공정을이용한나노구조산화물이종접합에관한비전과더불어향후달성되어야할목표들이제시될것이다. S13-9 Tuning the Phase Stability of Sodium Metal Pyrophosphate for High-voltage Sodium Batteries 고전압소듐이차전지양극소재개발을위한다형체연구김희진 *. 한국기초과학지원연구원 Properties of the battery electrode materials are strongly influenced by their crystal structures, yet there is still a lack of design principles to control the polymorphism. Here, the underlying mechanism that governs the phase stability of Na 2 CoP 2 O 7, which has two polymorphs with different electrochemical properties, and strategies to control it by defects are investigated. First, we discovered that the Na deficiency can induce the selective synthesis of triclinic Na 2 CoP 2 O 7, providing an increase in energy density of more than 40% compared to the orthorhombic polymorph. Second, It is also shown that the relative stability between the triclinic and orthorhombic phases of Na 2 MP 2 O 7 (M = transition metals) can be controlled by transition metal substitutions. From combined theoretical and experimental studies, we found that the relative stability between two polymorphs is determined by two factors, the ionic size and crystal field stabilization energy. Such an improvement in battery performance, which was achieved just by changing the crystal structure, suggests that controlling the polymorphism could be an effective and facile method for developing high-performance electrode materials and that the defect, such as vacancy and substituent, can play a remarkable role in this process. S13-10 Predicting Novel Oxides Using First Principles 제일원리이론계산을이용한새로운산화물예측김덕영 *. 포항공과대학교 Contemporary first principle calculations enable us to estimate chemical bonds with a quantum mechanical precision and even allow to predict the most stable materials without experimental inputs. Using density functional theory combined with a properly-designed structure searching strategy, we can conduct virtual experiments to predict novel functional materials. In this presentation, I will show two successful examples, lithium superoxide and iron peroxide. We predicted the formation of LiO 2 and LiO 4 at high pressure which is recoverable to ambient condition. Thus, they can be potentially used for air-battery [1] applications. We also predicted further oxidized iron oxide over hematite (Fe 2 O 3 ), namely iron peroxide (FeO 2 ) at high pressure [2, 3]. These two novel oxides were experimentally synthesized and I will address its scientific impact to energy frontier research and geoscience. [1] W. Yang, D. Y. Kim, L. Yang, N. Li, L. Tang, K. Amine, H.-K. Mao Adv. Sci , Oxygen-rich lithium oxide phases formed at high pressure for potential lithium-air battery electrode [2] B. Jang, D. Y. Kim, J. H. Shim, Phys. Rev. B (2017), Metal-insulator transition and the role of electron correlation in FeO 2 [3] Q. Hu, D. Y. Kim, W. Yang, L. Yang, Y. Meng, L. Zhang, and H.- k. Mao, Nature (2016), FeO 2, FeOOH, and the Earth s oxygen-hydrogen cycle S13-11 Understanding Magnetism and Metal-insulator Transition in SrRuO 3 Thin Films 스트론튬-류테늄산화물박막에서의저성과상전이의이해한명준 *. 한국과학기술원 Due to its remarkable progress in the past decades, the electronic structure calculation based on density functional theory enables us to study the correlated electron phenomena on the first-principles level, 80 한국세라믹학회

101 구두발표 which has been regarded as being impossible until quite recently. A fast growing research field of oxide nanostructures is posing new challenges to the theoretical understanding while it simultaneously requesting the parameter-free independent simulation study from experiments. In this talk, I will try to show both promising and challenging aspects of current first-principles computation methods with our recent works of ruthenate thin film as an example. At the different levels of approximations, our calculations have unveiled the previously unknown material characteristics some of which are still awaiting the experimental verifications. On the other hand, our study also clearly shows the limitations of current methodologies requiring further significant theoretical/computational developments. S13-12 Computational Materials Design for Developing High Performance Solid Oxide Fuel Cell Electrodes 고체산화물연료전지전극의성능향상을위한계산재료과학적설계한정우 *, 김경학, 권형욱. 서울시립대학교 Solid oxide fuel cell (SOFC) operated at high temperature have received considerable attention as a prospective device due to its high efficiency and fuel flexibility. For enhancing the SOFC performance, however, there are some critical issues to be resolved. First, oxygen reduction kinetics and its transport are drastically suppressed at reduced temperature. Second, severe degradation observed in electrode deteriorates long-term stability. To tackle these problems, it is essential to rationally develop the materials of SOFC components. Unfortunately, it is not easy to completely achieve it by depending only on conventional experimental methods. In this talk, we therefore introduce computational approaches to design SOFC electrode materials. Specifically, enhanced electrochemical performance through both the strain-driven chemical stabilization and the metallic nanoparticle exsolution of perovskite electrode surfaces will be discussed. We believe that our computational study will play an important role in improving SOFC performance by guiding or complementing the relevant experiments. S13-13 Atomistic Study of Exchange Coupling in the Brownmillerite-perovskite Interface 산화물계면에서의교환상호작용제일원리연구이재광 *. 부산대학교 Oxide interfaces have attracted considerable attention in recent years due to novel properties that do not exist in the corresponding parent compounds. Especially, the close interplay between the spin and charge degrees of freedom across heterointerface are of particular interest owing to their potential applications in terms of magnetoelectric devices. Here, using first-principles density functional theory calculations, we studied the exchange coupling behaviors in two different brownmillerite SrFeO 2.5 (BM-SFO) and perovskite SrFeO 3 (P-SFO) interfaces geometries. In this talk, I will briefly introduce the basic concepts of the magnetic coupling across the oxide interfaces, and novel findings in interfacial spin structures and related intriguing magnetic properties will be presented and discussed along with recent experimental reports. S13-14 Lead-free Relaxor Ferroelectricity and Photovoltaic Effects in SnTiO x Directly Deposited on Si Substrate SnTiO x /Si 구조에서의강유전성및광전효과에대한연구홍승범 1*, Radhe Agarwal 2, Yogesh Sharma 3, Siliang Chang 4, Krishna C. Pitike 5, Changhee Sohn 3, Serge M. Nakhmanson 5, Christos G. Takoudis 4, Ho Nyung Lee 3, James F. Scott 6, Ram S. Katiyar 2. 1 한국과학기술원, 2 University of Puerto-Rico, 3 Oak Ridge National Lab, 4 University of Illinois at Chicago, 5 University of Connecticut, Storrs, 6 University of St. Andrews We have studied ferroelectricity and photovoltaic effects in atomic layer deposited (ALD) 40-nm thick SnTiO x films directly onto p-type (001)Si substrate. These films showed well-saturated, square and repeatable hysteresis loops of 1.5 μc/cm 2 remnant polarization at room temperature, as detected by out-of-plane polarization versus electric field (P-E) and field cycling measurements. A photo-induced enhancement in ferroelectricity was also observed as the spontaneous polarization increased under white-light illumination. The SnTiO x films exhibited relaxor characteristics with dielectric peak shifting from ca. T = 600 K at f = 1 MHz to ca. 500 K at 100 Hz. Moreover, our films showed ferroelectric photovoltaic behavior under the illumination of a wide spectrum of light, from visible to ultraviolet regions. A combination of experiment and theoretical calculation provided optical band gap of SnTiO x films which lies in the visible range of white light spectra. Our study leads a way to develop green ferroelectric SnTiO x thin films, which are compatible with semiconducting processes, and can be used for various ferroelectric and dielectric applications. S13-15 Domain- and Template-engineered Oxide Epitaxial Thin Films as Photoanodes for Solar Water Splitting 태양광물분리를위한산화물단결정박막광전극들의강유전분역조작및하부층적용에대한연구이상한 *. 광주과학기술원 Recently, complex oxides epitaxial thin films have gained much attention due to their novel properties as a photoelectrode for hydrogen production via solar water splitting. We present two fundamental studies about BiFeO 3 and BiVO 4 which are well known as a promising photoanode. First topic is about domain-engineered BiFeO 3. BiFeO 3 has different spontaneous polarizations and ferroelectric domain structure depending on the crystallographic orientations, so it is of great significance to clarify the direct relationship between photocatalytic properties, spontaneous polarizations and ferroelectric domain structures. Considering the above, we revealed the most enhanced photocatalytic performances of BiFeO 3 could be shown in the (111) pc BiFeO 3, due to its high spontaneous polarization and mono-variant domain structure. Furthermore, ferroelectric polarization switching in the (111) pc BiFeO 3 caused an approximate change of 8,000% in the photocurrent density. Second topic is about template-engineered BiVO 4 epitaxial thin films. It is necessary to demonstrate high quality epitaxial films to explore their fundamental properties. In this study, the growth of epitaxial BiVO 4 is investigated using a thin γ-wo 3 template layer. Consequently, the photocurrent density of epitaxial BiVO 4 on the γ-wo 3 template layer is approximately 10 times greater than that of bare BiVO 4, related to the effective charge transfer by the γ-wo 3 intermediate layers. 한국세라믹학회 81

102 2017 년한국세라믹학회추계연구발표회 S13-16 Oxygen-vacancy-assisted Recovery Process to Enhance Electron Mobility of Perovskite Stannate Epitaxial Thin Films 손준우 *. 포항공과대학교 New transparent oxide semiconductors (TOSs) have received extensive interests and demands for the application of current optoelectronic devices. In particular, La-doped BaSnO 3 (LBSO) have recently attracted much attention due to the excellent roomtemperature electron mobility and the excellent thermal stability. Despite the great potential of LBSO for transparent electronics, epitaxial LBSO films were reported to show much lower electron mobility than single crystals, which has been ascribed into the high density of line defects. In this presentation, we demonstrate the significant increase in the room-temperature electron mobility of LBSO by delicately modulating the oxygen vacancy concentration. Through the accurate adjustment of oxygen partial pressure, the roomtemperature mobility of LBSO films on STO substrates could increase, which results in simultaneous increase of carrier density and mobility. The enhancement of room-temperature mobility by adjusting oxygen chemical potential is attributed to the annihilation of threading dislocation by high-temperature recovery process. Our finding suggests that the interaction between point defects and line defects can be exploited to boost carrier density and mobility in transparent oxide semiconductors. S14-1 IR Technology and Ceramics, Their Potential Infrared 기술과세라믹그리고그무한한가능성김주형 *. 인하대학교적외선 (IR) 열화상기술은온도측정와열분포를측정하는단순기술을넘어, 첨단소재분석, 실시간모니터링 (Condition Monitoring), 예측진단 (Predictive Monitoring) 등에응용되는복합기술로각광을받기시작하고있다. 특히산업혁명 4.0과연계되면서열화상기술은이미선진국을중심으로첨단지능형감시, 자동차용적외선센싱을통한무인주행기술, 의료용예측진단기술, 신재생에너지분야등에자율기반의시스템과접목하여향후다양한기술분야로활용될것이다. 본논문에서는적외선열화상센서에사용되는다양한적외선소재의특성들을살펴보고자한다. IR 열화상기술은상온에서적용이가능한 thermal형과민감도가높은 photon으로나누어진다. 특히 thermal형은 thermopile, pyroelectric, bolometer 등의특성에기인한다양한소재가사용되고있다. 반면에 photon형은 II-VI, III-V, IV-VI기반의소재또는 Si. Ge의소재가활용되고있다. VOx, a-si 등현재가장많이사용되는소재들을중심으로장점과한계점을살펴보고, Colossal Magnetoresistor (CMR) 기반의 Manganese산화물그리고 perovskite 기반의세라믹소재의특성과가능성그리고한계점을살펴보고자한다. S14-2 Technology Trend of Infrared Sensor in South Korea 국내개발적외선센서의기술동향배수호 *. 아이쓰리시스템냉각형, 비냉각형적외선센서의주요특징을설명하고, QVGA급부터 SXGA급까지군용목적으로개발된냉각형, 비냉각형적외선센서의기술수준및실제사례와함께, 향후발전방향을소개한다. 또한군용으로개발된적외선센서의민간활용을통해, 스마트기기용으로개발된비냉각형적외선카메라의특징및활용분야도소개한다. S14-3 Recent Progress of Mid Infrared Detector Based on InAs/ GaSb Type II Superlattice 김하술 *. 전남대학교 M id-wavelength infrared detectors using InSb or HgCdTe are widely used for military, medical, and industrial applications. In the past, the operation temperature of a quantum infrared device using a compound semiconductor was stable at ~ 77 K. However, there is a disadvantage that the value of the device is very expensive due to the necessity of low-temperature operation in order to remove noise. Recently, the development of InAs/GaSb type II superlattice growth technology and the development of band gap engineering technology have shown that the operating temperature of the device is 150 K. In this study, we show that InAs/GaSb type II superlattice infrared detector can be operated at room temperature for a single device. S14-4 Infrared Thermal Imaging Camera Application & Market Trends 적외선열화상카메라의응용과시장전망강대석 *. ( 주 ) 소모에너지엔테크놀러지빛의유무에관계없이물체에서발하는복사에너지를모아서그물체의영상을얻는장비를통칭하여적외선열화상카메라 (IR thermal imaging camera) 라고하는데, 이는우주항공및군사용에서민간산업의휴대기에이르기까지급속히발전하는추세이다. 적외선열화상카메라의응용은야간투시경, 화재징후감지, 전자기기의신뢰성분석뿐만아니라, 최근에는자동차나이트비전, 드론그리고위험지역감시로봇등다양한시장이전개되고있다. 그간중적외선 (MWIR) 과원적외선 (LWIR) 에의존하였지만근적외선 (SWIR) 의시장도새롭게선보이고있으며, 적외선과가시광카메라의융합형카메라도이미시장에서많은관심을모으고있다. 이런배경에서, 본논문에서는적외선열화상카메라의상용화실태와아직까지남아있는문제점, 그리고향후시장을전망해보고자한다. S14-5 적외선광학계및검출기기술동향한명수 *. 한국광기술원빛의유무에관계없이주야간사물을감지할수있는적외선센서시스템은최근자동차나이트비젼, 보안감시, 모바일어플리케이션등의적용을위해관심이높아지고있다. 적외선센서는그동안군수용으로냉각형센서가많이사용되어왔지만, 약 10 년전부터는민수용으로비냉각형적외선검출기 ( 마이크로볼로미터형 ) 의상품화로연성장률이약 20% 에달하여그기술개발및상품에관심이고조되고있다. 본연구에서는적외선카메라의눈에해당하는광학렌즈및적외선검출기에대한전반적인기술이해와세계선진업체의기술동향에대해알아보고, 수송용적외선카메라용광학계및검출기, 저가보급형적외선광학모듈의개발동향에대해소개한다. S14-6 A Review on the Infrared Sensor'''' Technology & Industry 적외선센서기술동향및산업현황한용희 *. 유우일렉트로닉스적외선은인간의눈으로는볼수없는 0.7 ~ 수십마이크로미터파장대역의빛을의미하며근적외선 (NIR), 단파장적외선 (SWIR), 중적외선 (MWIR), 원적외선 (LWIR or FIR) 으로구분되어감지되는파장영역에따라다양한특성및응용분야를갖는다. 특별히원 82 한국세라믹학회

103 구두발표 적외선파장대역은인간체온및인간이일상적으로생활하는온도영역에서나오는적오외선파장대와거의근접해가장많은응용분야가존재하며매우큰시장성장이예상되는분야이다. 근적외선은실리콘반도체기술로감지가가능한파장대역이며단파장적외선부터는실리콘반도체기술로감지가불가능한영역으로밴드갭이작은화합물반도체기술을이용하여감지가가능하다. 그러나화합물반도체기술은기술의난이도가매우높고실리콘반도체로제조되는신호취득회로 (ROIC) 와일체화가어려우며상온열잡음을제거하기위한별도의냉각장치가필요하게되어가격이매우고가이며사이즈도커지는단점이존재한다. 이에대한대안으로 MEMS 기술을이용한상온에서동작가능한원적외선센서가개발되었으며현재가장많은기술의진보가있어왔으며이를통한산업전반에걸친응용이진행되고있다. 이에원적외선 (LWIR or FIR) 또는열적외선이라고부르는적외선센서의소재기술부터제품기술까지망라한기술동향및산업동향에대해고찰하고자한다. S14-7 Electrical Properties of Spinel Manganite Thin Films for Uncooled Microbolometer Applications 비냉각형마이크로볼로미터응용을위한스피넬망가나이트박막의전기적특성전창준 *, 최용호, 정영훈, 윤지선, 박운익, 백종후, 홍연우, 조정호. 한국세라믹기술원 In order to develop new thermal imaging materials applicable to uncooled microbolometer, the electrical properties of the manganitebased thin films were investigated. These manganite films were prepared by various methods using an aqueous solution, such as liquid flow deposition, spin spray deposition and metal-organic decomposition. The annealed films showed a single phase of cubic spinel structure, which indicated the typical negative temperature coefficient (NTC) thermistor characteristics. The resistivity of nickel manganite system decreased with increasing copper, cobalt and/or chromecontent due to the carrier hopping and improved morphology. The high temperature coefficient of resistance (TCR) was obtained by the additives with stable valence. The annealing temperature could be effectively reduced to 380 C without any degradation of electrical properties. The spinel manganite thin films with good electrical properties and low-temperature annealing are promising candidates for applications to complementary metal-oxide semiconductor (CMOS) integrated microbolometer devices. S14-8 Chalcogenide Glasses for the Long-Wavelength Infrared Applications 원적외선대역응용을위한칼코지나이드유리의연구동향최용규 *. 한국항공대학교칼코지나이드유리는구성원소의원자량및화학결합특성으로인하여여타산화물계열또는불화물계열의광학유리에비해현저히확장된적외선투과창을나타낸다. 특히, 황을일부포함하거나포함하지않는셀레나이드계열의칼코지나이드유리는 8~12 μm 파장의원적외선대역에서우수한투과도를나타낸다. 또한, 칼코지나이드유리의경우태생적으로유리형성영역이내에서조성비를쉽게바꿀수있기때문에화학양론비를만족해야만하는결정질광학재료에비해굴절률및굴절률분산을용이하게제어할수있다는장점을가진다. 본발표에서는원적외선대역의광학계적용을위주로하는유 망칼코지나이드유리의조성시스템과더불어해당유리의광학적, 열적, 기계적특성을소개하고자한다. S14-9 Research and Development of ZnS Window (Lens) Materials for Infrared Application 적외선투과용 ZnS 윈도우 ( 렌즈 ) 소재연구개발동향홍연우 *, 백종후. 한국세라믹기술원 ZnS는 3.7 ev( 상온 ) 의넓은직접-밴드갭 (wide direct-bandgap) 을갖는화합물반도체 (II-VI족) 로서상온 ( 열에너지 ~23 mev) 에서 40 mev의엑시톤결합에너지를가지기때문에상온에서발광이가능하며, LEDs, electroluminescence, 평판디스플레이, 적외선투과창 (infrared window), FIR 카메라, 센서, 레이저, biodevices, optoelectronics, photonics devices 등으로응용된다. 결정학적으로 ZnS는 cubic zinc blende (<1024 o C, Sphalerite, β-zns) 와 hexagonal wurtzite (>1024 o C, α-zns) 구조를가지며, 다양한합성법으로 0차원에서 2차원까지다양한나노분말을합성할수있으며, 이때다양한첨가제 (dopants) 를활용하여광학적특성을제어한다. ZnS는제조되는분말의다양한형상에따라그응용이크게달라질수있는재료이며, 특별히적외선광학재료로사용하기위해서는높은굴절률, 낮은열분산특성, 저분산특성과낮은흡수능, 반사방지코팅의용이성, 우수한내구성등이필요하다. 적외선투과용 ZnS 소재는주로장적외선 ( 또는원적외선, 8-12 μm) 용투과창이나렌즈로응용되며 CVD법이나 HP 또는 HIP 및 SPS법으로연구및제조되고있다. 본발표에서는다양한적외선투과창이나렌즈소재들가운데 ZnS에대한연구개발현황에대하여개괄하며, 일부채택된 ZnS의나노분말합성법에서부터다결정형태의소결체연구에대하여소개하고자한다. S14-10 Enhancement of Near Infrared Up-conversion Luminescence of LuNbO 4 :Yb 3+,Tm 3+ LuNbO 4 :Yb 3+,Tm 3+ 의상향전이근적외선발광강도의향상임민혁 *, 김영진. 경기대학교상향전이 (Up-conversion, UC) 형광체는전자디스플레이나보안인쇄등에응용이가능하다. 바이오분야에서도기존의하향전이 (Down-conversion, DC) 형광체의단점을보완할수있는특성때문에최근근적외선 (Near infrared, NIR) UC 형광체에대한연구가활발히진행되고있다. NIR UC 형광체에적합한도펀트는 Yb 3+ 와 Tm 3+ 이다. 본연구에서는 LuNbO 4 :Yb 3+,Tm 3+ 분말을고상반응법으로합성하였다. 또한 Ga 3+ 와 Ta 5+ 이온을각각 Lu 3+ 와 Nb 5+ 자리에치환하여, 이들이 UC 발광에미치는영향을관찰하였다. LuNbO 4 :Yb 3+, Tm 3+ 분말은 980 nm 여기하에서 Tm 3+ 이온의에너지전이에의한좁은 UC 발광스펙트럼이 nm에서얻어졌으며, 가장강한발광피크는 805 nm에서관찰되었다. Ga 3+ 와 Ta 5+ 이온의치환에따라서 UC 발광강도가증가되었다. 이러한현상은치환에의한결정구조의국부적인변화가 Yb 3+ 와 Tm 3+ 주변의결정장에영향을주었기때문이다. Tm 3+, Ga 3+, Ta 5+ 양에따른 UC 발광스펙트럼의변화를측정하고, 그결과를 UC 기구, 결정구조, 결정장이론등을기반으로설명하였다. S14-11 High Performance Thin Film Getter with Cosputtered Ti-Pd Nanostructures 동시증착 Ti-Pd 나노구조를지닌고성능박막게터임효령 1*, 엄누시아 1, 조정호 2, 조홍백 2, 좌용호 1. 1 한양대학교, 2 한국세라믹기술원 한국세라믹학회 83

104 2017 년한국세라믹학회추계연구발표회 The bolometer-type infrared (IR) sensor is well known to be sensitive to vacuum conditions. To eliminate residual gases after hermetic sealing, the getter materials are necessarily located on the device wall to react with these gases and maintain suitably low pressure in operational lifetime. The thin-film-type non-evaporable getters comprised of Ti, V, Zr, or its alloy naturally form native oxide, passivation layer, protecting getters from the in-process contamination, which need to be removed at high temperature. In this work, we report on nanostructured Ti-Pd film-type getter via co-sputtering combined with post-heat-treatment method. The 585-nm-thick Ti-Pd/ Pd thin film was deposited on a silicon wafer and heated at 10-5 Torr at various temperature for 4 h. SEM and TEM results show the Ti-Pd nanostructures consisting of the protective layer (Pd) dissociating and transfering hydrogen surrounds getter (Ti) nanoparticles. Furthermore, it is found that an nanometric oxide layer on the surface Pd affects the microstructure and consequently controls the activation process. Hydrogen absorption capacity was calculated from the chemisorption data, resulting in 0.5 cc. torr/cm 2, which is high enough for adsorbing hydrogen physically or chemically in the IR imaging device. S15-1 Study on the Measurement of the Properties of Semiconductor/OLED Deposition Materials 반도체 /OLED 증착소재물성측정연구윤주영 1*, 김진태 1, 성대진 1, 정낙관 1, 이효창 1, 안종기 1, 심섭 1, 강고루 1, 송제범 1, 맹선정 1, 김하영 1, 허훈 2. 1 한국표준과학연구원, 2 한국생산기술연구원현재반도체및 OLED 산업에서여러가지증착소재가사용된다. 신규증착소재의경우산업분야에서활용되기위해서는증착소재의정확한물성측정이필수적이다. 하지만이러한증착소재는공기, 수분 열에의해서쉽게분해되고공정조건인진공에서물성을측정해야하기때문에정확한물성측정이어렵다. 우리는반도체 /OLED용화학증착소재의주요물성인증기압, 상전이및열 화학적안정성, 증기조성비를측정하기위해서측정설비를설계하고제작하였다. Static, dynamic과 effusion method를이용한장치는각각물성이널리알려진 naphthalene과 anthracene의증기압을측정하였다. 측정장비의오차를확인하기위해서미국표준과학연구원의데이터와비교하였을때 static method와 dynamic method를이용한장치의경우각각 o C 구간에서 9.46% 이하와 Torr 범위에서 0.41% 이하의오차범위를확인하였고, effusion method를이용한장치의경우 o C 구간에서 4.62% 이하의오차범위를확인하였다. 그리고현재산업에서널리활용되고있는반도체증착소재인 TEOS, ZAC의증기압을측정하였다. OLED 증착소재인 NPB에대한상전이및열 화학적안정성을측정하였고, 상용 DSC, TGA, HPLC 측정데이터와비교하였다. 혼합물의증기조성은 water과 acetic acid의증기조성을 dynamic method 증기압측정과응축기를이용하여측정하였고, 기존문헌데이터와상용 NMR 측정데이터를통해서비교검증하였다. This work was supported by Korea Research Institute of Standard and Science (KRISS) and R&D Convergence Program (CAP KRISS) of National Research Council of Science and Technology (NST) of Republic of Korea. S15-2 Real-time Plasma Process Monitoring using Advanced In-situ Sensors 실시간센서를활용한플라즈마공정진단모니터링기술홍상진 *. 명지대학교반도체소자의미세화및 3차원구조를갖는반도체제조의복잡성으로인해플라즈마공정의중요성이점점더강조되고있다. 이와더불어반도체제조환경에서는웨이퍼대구경화에따른수율향상을위해웨이퍼내 center-to-edge variation을최소화하기위해다양한노력을하고있다. 초미세소자의구현을위해서는공정플라즈마에대한이해뿐만아니라실제공정중에발생하는이상상태의모니터링및진단기술의중요성이제기되고있으며, 이를위해광학적인방법과전기적인방법으로이상공정을검출하고자하는연구가진행중이다. 본연구에서는 Optical Emission Spectroscopy를이용한플라즈마분광모니터링기술, 고속광센서를활용한모니터링기술, 및 VI-Probe를이용한 RF 신호검출에대한연구결과를제시하여, 실시간공정진단기술을소개한다. 마지막으로플라즈마분포의균일도를측정하기위해 On-wafer 형태로개발되고있는 Plasma uniformity monitoring sensor의개발단계를발표하므로서, 향후반도체산업계에서실제활용될수있는기술로발전시키고자하는연구결과를제시한다. S15-3 Analysis of Thin Film using In-situ Raman Spectroscopy in CVD Process CVD 박막공정에서 in-situ raman spectroscopy 분석기법활용유은성 *, 문수인, 허훈. 한국생산기술연구원우리나라최대첨단산업으로는반도체, 디스플레이, 태양전지등이있으며, 이러한분야에서의공통핵심기술중에는박막기술이있다. 이러한박막기술중현재개발방향에있어서첨단소형디바이스들의개발에는차세대박막의개발을위한공통되는박막분석기술이필수적으로필요하다. 그러나박막직접분석기술은공정챔버에적용하여 In-situ로분석하기에부족한점이있고, 기술적난점을해결하여야하는문제점이있다. 본연구에서는 CVD를이용하여 TiO 2 박막성장과정을 CVD공정챔버내의환경을최대한보존한상태에서라만광분석기를이용하여박막형성공정중손상을동반하지않고, in-situ 분석을통해박막의성분이나, 분자의결정성등을분석을하고자한다. 또한성장된 TiO 2 박막에대해 XPS, SEM분석을진행하여비교분석하였으며, 이를통해 In-situ 분석의검증을진행하였다. S15-4 Nanoanalysis by FE-(S)TEM FE-(S)TEM을이용한나노분석양준모 *. 나노종합기술원 FE-(S)TEM을이용한나노분석기법의응용에대해서발표한다. 주요발표내용은아래와같다. - HRTEM, EDS, EELS 분석의응용 - Electron Holography를이용한전기장 / 자기장의가시화 S15-5 Application of Atomic Layer Deposition in Photovoltaics 태양전지분야에서의 ALD 기술김대환 *, 이상주, 성시준, 강진규. 대구경북과학기술원 Atomic layer deposition (ALD) is a chemical vapor deposition technique that can be used to improve the interface properties by depositing high-quality thin films with precise growth control, very good uniformity over large areas and step coverage on non-planar surfaces. Therefore, these unique features make ALD technique 84 한국세라믹학회

105 구두발표 attractive for photovoltaic designs that require ultra thin film. In practice, in the field of photovoltaic devices ALD thin films are utilized in a wide variety of functional applications such as absorber layer, transparent conductive oxide, surface passivation layer, buffer layer, diffusion barrier, encapsulation layer, window layer, photoanode and blocking layer. In this study, we developed the several ALD processes and analyzed its thin film properties. The developed functional ALD thin films were applied to the photovoltaic devices and its characteristics were evaluated. S15-6 On the Studies of 5 nm Interconnects and Carbon Based Semiconductor 5 nm 인터커넥트및탄소기반반도체에관한연구표성규 *, 최은화, 심호재, 이강원, 고원. 중앙대학교 Lightweight-miniaturized devices which can surpass the Moore s Law with multi-functional high performance have been required due to the advent of high-information era and rapid enhancement of stateof-art technology along with the evolution of electronics industry. However, miniaturizing devices within currently allowed area has been facing adversity of physical limits. Extreme ultraviolet (EUV), the patterning technique for Ultra low-k dielectrics (ULK), Air gap structure, and depth of focus for scaling down the fabrication process, and discovering new materials as well as 3 dimensional (3D) integration which can be built upon a device to maximize the area efficiency have developed. Developing new materials is necessary in order for scaling down has been required for various reasons, and the problem of resistance (R)-capacitance(C) delay with increase of resistance caused by boundary scattering and a lower mean free path that are resulted from the Cu nano thickness used as a filling material for the interconnection. Therefore, nano-carbon semiconductors based upon grapheme lines and vertical carbon nanotube (CNT) interconnection have been paid attention as one of the most efficient countermeasures for solving such disadvantages. In this study, we will discuss 5 nm Interconnects and carbon based semiconductor. S16-1 ICSCRM2017 Summary and Domestic & Foreign SiC Research Trends Report ICSCRM2017 참가보고및 SiC 관련국내외동향전명철 1*, 김장열 2. 1 POSCO, 2 포항산업과학연구원 ICSCRM (International Conference on Silicon Carbide & Related Materials) 는 SiC 및관련소재를바탕으로전기 / 전자소자에관한최대단일학회이자전시회이다. ECSCRM(European Conference on Silicon Carbide & Related Materials) 과번갈아격년으로개최되는학회로, 올해로 17회인 ICSCRM2017은 9월 17일부터 9월 22 일까지미국의수도워싱턴 D.C. 에서개최되었다. ICSCRM2017에는기조연설 6건, 초청강영 19건, 구두발표 142건, 포스터발표 265 건으로총 432건의논문이발표되었다. 학회에참석한국내연구진들의도움으로이번학회의주요발표내용을요약, 발표하고자한다. 또한국내외 SiC 동향발표를통해국내 SiC 연구현상황을고찰하고향후진행방향논의에도움이되고자한다. S16-2 SiC Production with Top Seed Solution Growth (TSSG) Method : Thermodynamic Database for Alloy Design and Process Optimization 용액법을이용한 SiC 단결정성장에있어열역학적조성설계및공정설계정인호 *. 서울대학교 The phase diagram of the Si-C-X alloy system is the most fundamental information for the production of the SiC using liquid solution method. Unfortunately, such phase diagram information is scarce. In the present study, the alloy design concept for SiC production will be introduced from the thermodynamic viewpoint. In particular, the development and application of the computational thermodynamic database for the alloy design and process optimization will be presented. S16-3 The Limitations of Si Power Devices and the Developments of SiC Power Devices Si 소자의한계및 SiC 소자의개발방향서영훈 *, 강남주, 정시균. ( 주 ) 광전자전기에너지를활용하기위해서직류-교류변환, 전압, 주파수변화등의제어처리를수행하는반도체를전력반도체라고부른다. 특히전력제어용반도체소자인전력반도체는전력변환시고효율로전달하고, 손실을저감시키는핵심소자이다. 국내에서는실리콘 (Si) 을기반으로하는다이오드, MOSFET, IGBT 등의제품이전력반도체산업의거의대부분을차지하고있는상황이며, 현재 Si이가지는물성의한계로인해새로운소재를사용한고성능전력반도체개발이절실히요구되고있는실정이다. 새로운전력반도체로주목을받는 SiC 재료를이용한전력소자는우수한재료특성으로인해기존 Si 전력소자에비해같은항복전압소자에있어서온-저항을감소시켜전력손실을줄일수있고, 다수캐리어특성으로속도가빨라스위칭손실을감소시킬수있으며, 고온에서의소자안정성이우수하고, 수직형소자의제작이가능하기때문에전류밀도를증가시킬수있어칩의면적을절반이하로줄일수있다는장점이있다. 당사에서는 Si 재료를이용한다이오드, MOSFET, SJ-MOSFET, IGBT를생산판매하고있으며 Si 재료의한계를극복하기위하여 SiC 재료를이용한 SBD를개발완료하고양산화를진행중이며, 한국전기연구원- 광운대학교- 아이언디바이스와함께 1200V급 SiC MOSFET 소자의개발을진행하고있다. S16-4 SiC Technology and Industry Trend, Viewed by Device Company 소자업체에서바라본 SiC 산업동향양창헌 *. 테크닉스전력반도체는일반적으로전원장치라하며대부분이전력변환을위한스위칭소자로사용되고있는데최근 Si(silicon) 계열의전력반도체소자의특성이이론적한계치에다다르면서, Si의한계를뛰어넘는고전압, 저저항, 고주파및고온같은극한상황에서작동할수있는전력소자에대한요구가커지고, 이에만족하는새로운물질인 SiC(silicon carbide) 가이슈화되었다. SiC는 Si에비해뛰어난물성적특성을갖고있어성능측면에서뿐만아니라전력변환장치의크기를획기적으로줄일수있다. 특히소자가직접적으로고온환경에서동작이가능하면, 신뢰성있는정확한측정및제어가가능할뿐만아니라시스템소형및경량화실현, 빠른응답특성, 결과적으로효율향상등의여러장점을얻을수있기때문에현재까지소자의연구가활발히진행되고있다. 이러한 SiC 전력반도체소자를개발하기위해서는이론적설계뿐만아니 한국세라믹학회 85

106 2017 년한국세라믹학회추계연구발표회 라공정개발역시필수적이다. 본연구에서는 SiC 핵심공정기술및소자업체관점에서의산업동향대하여소개하고자한다. S16-5 SiC LDIMOSFETs with Gate Field Plates on on-axis HPSI Substrates HPSI SiC 기판에서제작된 LDIMOSFET 의전기적특성석오균 1*, 김형우 1, 문정현 1, 이현수 2, 방욱 1. 1 한국전기연구원, 2 경상대학교 We propose 4H-SiC lateral double implanted MOSFETs (LDIMOSFETs) on high-purity semi-insulating substrates (HPSI) without epitaxial layers. In addition, the gate field plate is employed so that we successfully demonstrated high-breakdown voltage of 934 V and R on,sp of 59.5 mω cm 2 at L ch, L drift, and L FP are 2, 15, and 2 μm, respectively. In order to suppress electric field concentration at the gate, the gate field plate was employed on a 200 nm-thick field oxide layer for the devices having L Drift of 10 and 15 μm. The length of gate field plate (L FP ) was defined as the length between edge of field plate and edge of poly-si gate. Our simulation results with gate field plates show that breakdown voltage of the device having L Drift of 10 μm is increased from 464 to 823 V at L FP = 2 μm. In case of L Drift = 15 μm, the breakdown voltage is increased from 708 to 1179 V. S16-6 ALD SiO 2 Gate Dielectric for 4H-SiC based MOS Devices 4H-SiC 기반 MOS 소자를위한 ALD SiO 2 게이트절연막하민우 1*, 조유진 2, 박태주 2. 1 명지대학교, 2 한양대학교와이드밴드갭을가지는 4H-SiC는차세대전력스위칭 MOS로각광을받고있다. 4H-SiC MOS 소자내온혹은오프전류흐름을결정하는부분은게이트로중요하다. 4H-SiC 게이트절연막을형성하는방법은열산화법과증착법등이있다. 열산화법은 1200 C 내외고온에서진행되며 4H-SiC의탄소가게이트절연막으로확산하는문제점을가진다. 열산화법은널리이용되지만, 4H-SiC와 SiO 2 사이의인테페이스와 SiO 2 내부에확산된탄소로인한여러전기적문제점을가진다. 증착법은다시화학기상증착법, 스퍼터링및원자층증착법으로나뉜다. 이중원자층증착법은고종횡비, 고품질및낮은불순물함량을가지는절연막을 400 C 이하에서성장이가능하여 4H-SiC MOS의게이트절연막성장법으로주목을받고있다. 본연구에서는 SiO 2 원자층증착법을이용하여 4H-SiC MOS의게이트절연막을성장하였고, 제작된소자의전기적및재료적특성을측정하여분석하였다. 원자층증착법성장온도에따른 MOS의커패시턴스-전압특성과게이트절연항복전압을연구하였다. 또한포스트증착어닐링전, 후 SiO 2 / 4H-SiC의탄소분포를이차이온질량분석을통하여분석하였다. 결론적으로원자층증착법은 4H-SiC MOSFET의게이트공정에적용이유망하지만, 열산화법과비교하여추후최적화연구가필요하다. S16-7 Residual Stress Analysis on the 4H-SiC Crystal Grown by Top Seeded Solution Growth Technique TSSG 공법으로성장한 4H-SiC 단결정의잔류응력분석유영재 1*, 변대섭 1, 신윤지 1, 최수훈 2, 이명현 1, 이원재 2, 정성민 1. 1 한국세라믹기술원, 2 동의대학교 Top Seeded Solution Growth (TSSG) 는다른공법과비교해고품질성장이가능하기에차세대단결정성장방법으로각광받고있다. TSSG 공법에서 SiC 단결정은 Graphite 재질의 Seed holder와 부착된다. 따라서고온공정시이두물질의열팽창계수차이가성장단결정에잔류응력을야기한다. 또한, TSSG 성장후성장층표면에형성된액상 droplet 이성장층에응력을인가한다. 따라서, 본연구에서 TSSG 로성장시킨 SiC 단결정의잔류응력과액상 droplet 형성매커니즘을분석했다. 이를위해, High-resolution X- ray diffraction (HRXRD) 와 Raman spectroscopy 를사용해공정전후의표면응력을정량적으로구했다. 또한 synchrotron white beam X-ray topography (SWXRT) 와 HRXRD 를사용해전위분포와단결정품질을측정했다. TSSG 공정후성장단결정의잔류응력은증가했다. 흥미롭게도, 액상 droplet 이존재했던영역은잔류응력이감소했고많은 Micropipe (MP) 들이형성되었다. S16-8 Study on Improvement of SiC Growth Rate using Modified Crucible in TSSG Method TSSG방법에서도가니의구조변경으로인한 SiC Crystal의성장률향상에관한연구최수훈 1*, 김영곤 1, 이채영 1, 최정민 1, 박미선 1, 장연숙 1, 이원재 1, 신윤지 2, 정성민 2, 이명현 2, 김영희 2. 1 동의대학교, 2 한국세라믹기술원본실험에서는 SiC(Silicon Carbide) 단결정성장을위한액상성장법중의하나인 TSSG(Top Seeded Solution Growth) 방법을사용하였다. Bowl 모양으로제작된흑연도가니내부로실리콘용액을첨가하여 SiC 종자정으로부터결정성장이이루어지는방법을이용하였다. 종자정은용액상부에위치되며, 공급되는 SiC source 는도가니에담겨있는 Si melt와도가니내벽의 carbon을이용한다. SiC Crystal Growth에필요한 carbon은 Si melt로용해되는데, 이경우용해되는탄소의양이매우낮기때문에 Si melt의탄소포화도를높여주기위하여 Cr, Fe, Ti 등 Metal addition을첨가하는연구도진행되고있다. 도가니는 Si melt를담는용기의역할도하지만성장에필요한탄소공급을하므로크기및구조에따라성장양상이달라진다. 따라서, 본실험에서는일반적으로사용되고있는도가니와내부벽면에 Step 모양이들어간도가니를사용하였고이에대한결과를일반도가니를사용하였을때와비교하였다. 종자정으로는 4 offaxis된 4H-SiC의 C-face를사용하였으며성장온도는 1900 o C, Ar gas 분위기하에서 2-4시간동안 pure silicon 용액에서성장을진행하였다. 실험이전 CGSim(corp. STR) 프로그램으로시뮬레이션을통한도가니내부온도구배및탄소농도를관찰하였다. 성장된결정은 OM(Optical Microscopy) 을이용하여표면형상과성장률을관찰하였으며 Polytype 분석을위해 RAMAN 분석을이용하였다. 본실험을통하여일반도가니보다변형된도가니로성장된 SiC Crystal의성장률이더향상된것을확인할수있었다. S16-9 Analysis of Crystal Defects in 4H-SiC based on Various Diffraction Vectors by X-ray Topography X-ray Topography의 geometry에따른 4H-SiC 결정결함의분석금주연 1*, 나문경 2, 방욱 2, 구본흔 1. 1 창원대학교, 2 한국전기연구원 SiC는와이드밴드갭물질로기존의 Si 소재에비해고온, 고전압환경에적용이가능하여차세대전력반도체물질로주목받고있다. SiC에존재하는다양한형태의결함은전력소자의전기적특성을저하시키는원인이된다. SiC의결함은성장시부터제어가되어야하나고온성장으로인해결함의제어가어렵다. 전력소자구동시, threading dislocations (TDs) 과 basal plane dislocations (BPDs) 은항복전압을낮추고누설전류를증가시킨다. 이런결정결함을관찰하기위해 KOH 용융염을이용한에칭방법을주로사용한다. 하지만이방법은파괴분석방법중하나로결함이소 86 한국세라믹학회

107 구두발표 자의특성에미치는영향을파악할수없다. 따라서비파괴분석방법인 photoluminescence spectroscopy (PL), X-ray topography (XRT) 등을사용한다. 이중에서도 XRT 는짧은시간에분석이가능한장점이있다. 본연구에서는, 방사광가속기를이용한 XRT 분석방법으로 SiC wafer 에존재하는결함을분석하였다. XRT 는브래그회절법칙에기인하여결정에의해회절된 beam 이이미지화된것을분석하는방법이다. 결함주변 stress 로인해회절이미지에 contrast 차이가발생하게되고이를통해결함을구분할수있다. Reflection geometry 에서는 wafer 표면에존재하는결함의분석이가능하다. Transmission geometry 에서는 beam 이 wafer 를통과하여 bulk 결함정보를확인할수있다. SiC wafer 의동일위치에서 geometry 에따른다른종류의결함을비파괴적으로관찰하였다. S16-10 Oxygen- and Photoresist-Related Interface States of 4H- SiC Schottky Diode Observed by Deep-Level Transient Spectroscopy Deep level transient spectroscopy를이용한산소와, 포토레지스트와관련된 4H-SiC 쇼트키다이오드의계면결함관찰강홍전 1*, 문정현 2, 방욱 2, 허재영 3, 김형준 1. 1 서울대학교, 2 한국전기연구원, 3 전남대학교 Trap levels play an important role in semiconductor power devices. The barrier height of a metal-semiconductor junction, one of the important factors of unipolar devices, is influenced by point defect at interface, i.e., interface states. However, there has not been much research on the interface states of Schottky diodes yet. Here, we report newly found KI1, KI2, and KI3 interface states of 4H-SiC Schottky diodes. We observed their changes after the first deep-level transient spectroscopy measurements, in which temperature rises to 750 K, and discussed the origins of these changes by using X-ray photoelectron spectroscopy and scanning electron microscopy. The KI1 was related to oxygen and photoresist (PR) residue, the KI2 was related to oxygen, and the KI3 was related to the PR residue. S16-11 Mg-compensation Effect in GaN Buffer Layer for AlGaN/ GaN High-electron-mobility Transistors Grown on 4H-SiC Substrate 이경재 *, 고광세, 최의호, 한재연, 남옥현. 한국산업기술대학교 The present study investigated the Mg doping effect in the gallium nitride (GaN) buffer layers (BLs) of AlGaN/GaN high-electronmobility transistor (HEMT) structures grown on semi-insulating 4H- SiC substrates by metal organic chemical vapor deposition. When the Mg concentration was increased from to cm -3, the crystal quality slightly deteriorated, whereas electrical properties were significantly changed. The buffer leakage increased approximately 50 times from 0.77 to 39.2 na at -50V with the Mg doping concentration. The Mg-compensation effect and electron trapping effect were observed at Mg concentration of and cm 3, respectively, which were confirmed by an isolation leakage current test and low-temperature photoluminescence. When the BL was compensated, the two-dimensional electron gas (2DEG) mobility and sheet carrier concentration of the HEMTs were 1560 cm 2 V -1 s -1 and cm 2, respectively. As a result, Mg-doped GaN BLs were demonstrated as a candidates of semi-insulating BLs for AlGaN/GaN HEMT. G2-1 Investigation of the Effect of Rare-Earth Dopants in CeO 2 Nanoparticles on CO and H 2 Oxidation Reactions 희토류도펀트가세리아의 CO 및 H 2 산화반응촉매특성에미치는영향에대한연구유정도 1*, 김경학 2. 1 KAIST, 2 서울시립대학교 CeO 2 (ceria) is among the most investigated oxide in chemical and electrochemical catalysis due to its unusual surface redox chemistry in combination with high oxygen storage capacity. Despite many research efforts, however, the role of dopants on the catalytic activity of ceria has rarely been studied, and their conclusions remained controversial. This is partly because that most of the previous studies used ill-defined particle structures in terms of size and specific surface area, which may strongly affect catalytic performances of ceria nanoparticles (NPs). Here, we address this issue by synthesizing particles with nearly identical geometries, while varying only a choice of dopants. A series of Ce 0.8 RE 0.2 O 2-δ (RE = La, Pr, Sm, and Nd) and undoped CeO 2 NPs are prepared by an EDTA-citrate complexing method. The precise control of accessible synthetic parameters such as ph and ratio of precursors allows maintaining the size and area of particles within 2% and 8% errors, respectively, among all samples. Both CO and H 2 oxidation are chosen as a target reaction. The DFT calculations, in which the reaction on RE-doped CeO 2 (111) is described via the Mars- Van Krevelen mechanism, are combined with experimental results to reveal the true effect of dopants on ceria catalysis. Based on the theoretical interpretation of our experimental results, we demonstrate that the ionic radius of the RE dopant can be used as a simple descriptor to predict a rate determining step, thereby predicting the whole reaction activity. G2-2 Charge Transfer at Amorphous-Crystal Interface of TiO 2 and Related Photocatalytic Activity TiO 2 비정질-결정질계면에서의전하이동이광촉매활동도에미치는영향최희채 *. ( 주 ) 버추얼랩 Amorphous phases of oxides are frequently observed as intermediates of crystalizations or are intentionally prepared with thermal processing for engineering purposes. The existence of amorphous phases in nanocrystal oxides is known to strongly affect the electrochemical properties of oxides. Recently, partial amorphization of TiO 2 has been reported to enormously improve various functionality, such as photocatalysis and battery performances. However, the physical origins of improved photocatalytic activity and battery performances have not been clearly found so far. This study systematically investigated the diffusivity of Li-ion and electronic structures of amorphous-crystal interfaces of TiO 2 using density functional theory (DFT) calculations and experiments. G2-3 Fabrication and Performance of Ni/MgO Methane Steam Reforming Catalysts by Exsolution Exsolution법을이용한재생가능성및내구성을가진수소생산용 N i/mgo 촉매박용선 *, 임예솔, 황해진. 인하대학교석유자원고갈과지구온난화현상이진행됨에따라대체에너지원개발에대한관심이증가하고있다. 오염물질의방출이적은새 한국세라믹학회 87

108 2017 년한국세라믹학회추계연구발표회 로운에너지전환및저장장치인연료전지가그에따른하나의대안책으로부상하고있다. 하지만연료전지의연료인수소를생산하는과정에많은비용이필요하기때문에매장량이풍부한천연가스를수소에너지로전환하기위한개질촉매연구가진행되고있다. 메탄수증기개질촉매에는전이금속 (Ni, Co, Cu) 또는귀금속계금속 (Ru, Pd, Pt) 이사용되는데, Ni 계촉매는귀금속보다저렴하고제조공정도단순하여경제적이점을갖지만탄소침적또는입성장등으로인한열화문제가단점으로지적되고있다. 본연구에서는 Ni 계개질촉매의내구성을향상시키기위해 exsolution 법을이용하여 Ni 촉매를활성화시킨 Ni/MgO 복합개질촉매를제조하였다. 또한환원온도및시간등의공정조건을변화시켜 Ni 입자의크기및분포에미치는영향을조사하였다. Fixed bed reactor 내에촉매를넣고 5%CH 4 /10%H 2 O, o C 의조건에서메탄전환율을측정하고 XRD 와 SEM 을통해제조된촉매의미세구조및분포를확인하였다. G2-5 Reactive Air Brazing Technique for Oxygen Transport Membrane Applications Kati *, 최재형, 김세영, 김수현, 성영훈. 한국에너지기술연구원 Dense ceramic oxygen transport membrane (OTM) allows oxygen to permeate at elevated temperatures under an oxygen partial pressure difference without the need for additional electric power. To fabricate a multi-layered structure for maximizing oxygen production, OTM ceramics need to be joined or sealed hermetically to metal supports for interfacing with the peripheral components of the system. Therefore, in this study, Ag 10 wt.% CuO was evaluated as an effective filler material for the reactive air brazing (RAB) of dense Ce 0.9 Gd 0.1 O 2 δ La 0.7 Sr 0.3 MnO 3±δ (GDC LSM) OTM ceramics. Thermal decomposition in air and wetting behavior of the braze filler was performed. RAB was performed at 1050 C for 30 minutes in air to join GDC LSM with four different commercially available high temperature-resistant metal alloys, such as Crofer 22 APU, Inconel 600, Fecralloy, and AISI 310S. The microstructure and elemental distribution of the ceramicceramic and ceramic-metal interfaces were examined from polished cross-sections. The mechanical shear strength at room temperature for the as-brazed and isothermally aged (800 C for 24 h) joints of all the samples was compared. The results showed that the strength of the ceramic-ceramic joints was decreased marginally by aging; however, in the case of metal-ceramic joints, different decreases in strengths were observed according to the metal alloy used, which was explained based on the formation of different oxide layers at the interfaces. G2-6 Ultra-fast Fabrication of a Tape-cast NiO-YSZ Anode Slurry by a Resonant Acoustic Mixing Technology for an SOFC Application 음향공명진동혼합법을이용한고체산화물연료전지용연료극지지체테이프캐스팅슬러리의초고속제조공정연구박정화 *, 김경준, 김도엽, 배경택, 이강택. DGIST ( 대구경북과학기술원 ) 고체산화물연료전지 (Solid oxide fuel cell, SOFC) 는에너지변환효율이높고친환경적인차세대에너지변환기술이다. 이중, 연료극지지형 SOFC는 20 um 이하의얇은후막형전해질층을사용할수있어서전해질저항손실을최소화하고, 출력성능을향상할수있다. 현재 NiO-YSZ(Yttria-stabilized zirconia) 복합지지체가가장널리사용되고있다. 일반적으로 NiO-YSZ 지지체는테이 프캐스팅 (Tape-cast) 법으로제작되는데, 이를위한슬러리제조는기존의볼밀링혼합법을이용할경우원료분말과다양한바인더고분자들의균일한분산을위해기본적으로수십시간 (2~3 일 ) 이상의시간이소요된다. 최근, 음향공명진동혼합기법을통해낮은주파수영역의음파를적용하여단시간내에다양한고체및액체간균일한혼합물을제조하고비용을절감할수있는기술이개발되었으나, 아직 SOFC 분야에적용된연구는보고되지않았다. 본연구에서는최초로음향공명진동혼합기술을도입하여테이프캐스팅을위한슬러리를초고속으로제작하는공정을개발하였다. 제작된연료극지지체는 SEM, FIB-SEM, AFM 및 EDS 를이용하여미세구조및화학적분석을진행하고, 단전지를제조하여전기화학적성능을평가하였다. G2-7 Improved Performance of Metal-decorated SOFC Electrode via Atomic Layer Deposition 원자층증착기법을통한나노입자가도포된 SOFC 전극특성향상서종수 1*, Nikolai Tsvetkov 1, 김정환 2, 지상훈 3, 이시원 1, 곽노우 1. 1 한국과학기술원, 2 한국기계연구원, 3 한국건설기술연구원 Highly active metal nanoparticles (NPs) are desired to serve for hightemperature electrocatalysis, such as solid oxide fuel cells (SOFCs). However, the insufficient thermal stability of metal NPs is a grand challenge in ensuring the durability of metal-decorated electrodes. It is thus necessary to effectively suppress the sintering of the metal NPs distributed on the electrode surface at high operating temperatures (> 500 ºC). Here, we address this issue with oxide surface treatment via atomic layer deposition (ALD). Porous electrodes (i.e., La 0.6 Sr 0.4 CoO 3 or La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3 ) are fabricated by screen print, and then Pt NPs are impregnated on the surface of electrodes. To prevent the agglomeration of NPs, thin layers of HfO 2 and Al 2 O 3 are uniformly coated on the Pt-decorated electrodes via ALD. We observe that the ALD-treated electrodes with Pt NPs remarkably improve both electrochemical activity and long-term (50 hrs) stability at 650ºC, as evidenced by AC impedance analysis. The implications for the use of ALD for the development of high-performance electrodes will be discussed. G2-8 Development of Double Doped Spinel Materials for Protective Coating of Metallic Interconnect for SOFC Applications THAHEEM IMDADULLAH *, Kang Taek Lee. DGIST ( 대구경북과학기술원 ) The Mn-Co-based spinels are promising materials as protective coating for solid oxide fuel cell (SOFC) interconnects. Doping the transition metals into Mn-Co-based spinels leads to alteration in material properties, such as thermal expansion, sintering behavior, and electrical properties. In this work, we studied the effect of double doping in the Mn-Co spinel materials on the therm-mechanical and electrochemical properties as a coating layer on the metallic interconnect. The area-specific resistance (ASR) of the novel spinel material coated interconnect was as low as 0.01 Ω-cm 2 at 650 o C, which is ~ 10 times lower than that of the undoped spinel coated sample (0.11 Ω-cm 2 ). We also conducted long-term stability and investigated the effect of the double doping on the time-dependent Crdiffusion behavior on the surface of interconnect. 88 한국세라믹학회

109 구두발표 G2-9 A Comparative Study of Low-purity Natural Graphite with Various Impurities as Anode Active Materials for Lithium Ion Batteries 리튬이온전지의음극활물질로서다양한불순물이함유된저순도천연흑연의비교연구박윤태 *, 박재우, 이기태. 전북대학교 The carbonaceous material, graphite, for lithium intercalation compound has shown high capacity and good cycling performance. The graphite materials can be divided into synthetic and natural graphite. However, the use of synthetic graphite in lithium ion batteries for electric vehicles and energy saving system is limited due to its relatively high costs. In this regards, relatively inexpensive natural graphite is suitable for an alternative of the synthetic graphite. Natural graphite (NG) has been attracted as a promising anode material for lithium ion batteries due to its appropriate charge/ discharge profile, high reversible capacity and low cost. However, pristine natural graphite contains various impurities, such as Al, Fe, and Si. For commercial use, pristine natural graphite should be refined because the impurities would have a negative effect on both electrolyte and electrode of lithium ion batteries. The purity grade of natural graphite can be classified based on the purification process. As the purity requirement increases, more purification steps are needed, resulting in high cost. Therefore, the main issue for the application of natural graphite as an anode active material is to use low-purity natural graphite with purification process as less as possible. In this study, we focused on the precise understanding of the effects of impurities in natural graphite. G2-10 Ag Nanoparticles Coated One-dimensional Orthorhombic Nb 2 O 5 for Excellent Lithium Storage 우수한리튬이온저장을위한은나노입자가코팅된 1차원사방정계의니오비움산화물정준영 *, 김찬훈, 정지원, 김일두. KAIST Highly pseudocapacitive electrode materials offer several merits over conventional electrode materials, as they exhibit good ion storage at relatively fast charge/discharge rates. Among them, orthorhombic niobium (V) pentoxide (T-Nb 2 O 5 ) has gained much attraction for lithium-ion batteries (LIBs) due to its excellent intercalation reaction with Li along with considerable safety. Nevertheless, T-Nb 2 O 5 has so far prevented its use as the viable electrodes for LIBs due to its low conductivity. To resolve these issues, the decoration of highly conductive Ag nanoparticles (NPs) was successfully carried out by simple solution reduction process on T-Nb 2 O 5 in two different forms: one-dimensional structure (nanofiber) and zero-dimensional structure (nanoparticle). By the introduction of Ag NPs, it has been shown that the capacity was increasd by ~20% compared with the pristine T- Nb 2 O 5 (retaining a capacity of 180 mah g -1 after hundreds of cycles) along with excellent rate capabilities. The simple solution reduction process can be adopted to decorate the highly conductive Ag NPs, which serve to provide a fast electron pathway desirable for practical application in LIBs. G2-11 Enhancement of Electrochemical Stability of Sulfide based Glass-Ceramics Electrolyte by Oxide Substitution 산소치환을통하여황화물계글래스세라믹전해질의전기화학적안정성향상손진오 *, 박찬휘, 신동욱. 한양대학교 All-solid-state lithium ion batteries have attracted attention as the safety which can solve the problem of conventional lithium batteries using flammable organic liquid electrolyte. Conventional lithium ion batteries have been reported of many accidents by its flammability. However, all-solid-state batteries using solid electrolytes are demonstrated by its ultimate safety such as non-flammability. The sulfide based solid electrolytes are expected to demonstrate superior electrochemical performance due to the Li 2 S-P 2 S 5 glassceramics provides high ionic conductivity of over 10-3 S cm -1. However, it has a weakness of electrochemical stability. For resolve the electrochemical stability of glass-ceramics electrolytes, many researches have been reported. One effective method is to substitute the sulfur atoms with the oxygen atom. A. Hayashi et al., reported that substitution of P 2 O 5 for P 2 S 5 is useful for improving electrochemical stability of the glass ceramics. In this study, Li 2 S-P 2 S 5 -Li 2 SO 4 glass-ceramics solid electrolyte was synthesized by mechanical milling and a subsequent heat treatment. Addition of Li 2 SO 4 into Li 2 S-P 2 S 5 electrolyte is expected to decrease the interfacial resistance between the electrolyte and cathode electrode. The local structure and electrochemical properties of solid electrolytes which were to substitute the Li 2 S with Li 2 SO 4 salt are analysed. As a result, Li 2 S-P 2 S 5 -Li 2 SO 4 electrolytes were demonstrated improving electrochemical performances. G2-12 High Capacity of Modified Li 4 Ti 5 O 12 Anode Material for Rechargeable Sodium-ion Batteries 소듐이온전지용고용량리튬티탄산화물음극소재윤빈나 *, 정훈기. 한국과학기술연구원 In recent years, while lithium resources continue to decline worldwide, sodium-ion batteries (SIBs) are believed to be a potential candidate due to its low cost, non-toxic and more abundant than lithium. Among various anode materials, lithium titanate (LTO) is expected to be a promising anode material in SIBs due to the outstanding performances have already been shown in lithium-ion batteries (LIBs) such as stable cycle-life, safety aspect, etc. However, LTO, as sodium anode material, is still facing with insulating properties and sluggish Na + diffusion. To solve these problems, boron-doped carbon coated LTO was introduced by low-cost and facile one-pot wet-chemical method. Boron acts as a positive-type dopant (electron acceptor) because it possesses the fewer electrons than the carbon. Hence, boron in BC 3 doped type could generate the positive charged holes to carry electrons through carbon structure, which enhances the electric conductivity. Furthermore, BC 2 O and BCO 2 doped type formed by boron-doping in carbon matrix which were confirmed by XPS analysis remarkably create abundant extraneous defects and active sites. So as to confirm the boron-doping effects in SIBs, electrochemical evaluation was implemented with rate-capability and cycle tests at room temperature. Boron-doped carbon coated Li 4 Ti 5 O 12 (CB-LTO) was compared to not only carbon coated LTO (C-LTO) but also 한국세라믹학회 89

110 2017 년한국세라믹학회추계연구발표회 pristine LTO sample through electrodes applied in CR2032 coin-type sodium-ion cells. G2-13 Electrochemical Characterization of Mixed-Anion Phosphates/r-GO composite with Cobalt Substitution as Cathode Material for Na-Ion Battery 나트륨이온전지양극용물질로써코발트치환된혼합인산화물 / 그래핀옥사이드나노화합물의전기화학적특성류수지 1*, 정영화 2, 왕지은 1, 김주형 1, 마호진 1, 김도경 1. 1 KAIST, 2 포항가속기연구소 Rechargeable sodium ion (Na-ion) batteries are widely recognized as one of the promising alternative energy storage systems (ESS) for Liion technology due to its abundance and low cost. Polyanion type materials with a 3-D framework structure have received much attention due to their high operating voltage and structural stability. Among the various polyanion type materials, mixed-anion phosphates are known to exhibit high power, low volume change and high thermal stability. However, these phosphates synthesized by the solidstate process have limitations such as poor kinetics due to sluggish redox process and poor electronic conductivity. In this study, electrochemical properties of nano-sized Na 4 Mn 3-x - Co x (PO 4 ) 2 (P 2 O 7 )/r-go composite prepared by solution combustion synthesis (SCS) method have been reported. The structural and the phase purity were confirmed by powder X-ray diffraction method. The morphological changes were investigated. The electrochemical performance was evaluated using cyclic voltammetry and galvanostatic charge-discharge cycling methods. The cells made with cobalt substituted mixed-anion phosphates and r-go composite exhibit better electrochemical kinetics and improved electrochemical properties. The effect of substitution and the physicochemical and electrochemical characterization of cobalt substituted Na 4 Mn 3-x Co x - (PO 4 ) 2 (P 2 O 7 )/r-go composite will be discussed in detail. G2-14 A Binder-free Carbon Electrode for Li-O 2 Batteries and Atomic Layer Deposition of RuO 2 as an Inhibitor-promoter 신현섭 1*, 정규남 2, 김한성 1, 황진하 3, 이종원 4. 1 연세대학교, 2 한국에너지기술연구원, 3 홍익대학교, 4 조선대학교 A rechargeable lithium oxygen (Li O 2 ) battery has been considered as a promising technology for electrochemical energy storage systems, because its theoretical energy density is about ten times higher than those of state-of-the-art Li-ion batteries. Carbon is, however, known to undergo parasitic decomposition reactions with Li 2 O 2 to produce carbonate species under typical operation conditions of Li O 2 batteries, which in turn causes a considerable increase in the interfacial resistance. As a consequence, carbon-based cathodes suffer from low round-trip efficiency and poor cycling performance. Cathode materials with suitable pore structures and efficient catalyst are needed in order to prevent electrical passivation from discharge products. Atomic layer deposition (ALD) surface coating has been conducted as a unique surface modification process for cathode materials of Li O 2 battery, since the materials developed by ALD can offer much better conformal surfaces coating on electrodes thus leading to better cycling ability. Here, a binder-free carbon nanotube (CNT) electrode surface-modified by ALD of dual acting RuO 2 as an inhibitor promoter is proposed for rechargeable Li O 2 batteries. RuO 2 nanoparticles formed directly on the binder-free CNT electrode by ALD play a dual role to inhibit carbon decomposition and to promote Li 2 O 2 decomposition. It was demonstrated that the cathode with the unique architecture shows a remarkably reduced voltage gap as well as long-term cyclability. G2-15 KF-VPO 4 Nanocomposite: a Novel Concept of Positive Electrodes in K-ion Battery KF-VPO 4 나노복합소재 : 포타슘이온전지양극소재의새로운디자인컨셉연구최일록 *, 황인상. 서울대학교현재상용화되어있는리튬이온전지 (LIB) 는 Li의한정된매장량으로배터리수요가늘어남에따라그가격이크게상승할것으로예상하고있다. 이에대응하기위하여차세대에너지저장소재로소듐이온배터리 (NIB) 와포타슘이온배터리 (KIB) 에관한많은연구가진행되고있다. 특히 KIB의경우, K + 이 LIB의음극으로사용되던흑연에저장이가능하고 K + /K 표준환원전위가 Li + /Li에비해 0.1V 낮기때문에높은전압을가지는 KIB의개발가능성이크다. 기존양극소재들은캐리어이온 (Li, Na, K) 과가역적인산화수변화를할수있는전이금속이하나의결정구조로되어있는물질을중심으로개발되어왔다. 이와는다르게, 최근에개발된 LIB의양극소재로 LiF와산화 / 환원반응이가능한전이금속을포함하는 FeF 2, MnO 등을나노미터단위에서혼합한나노복합소재형태가보고된바가있다 [1]. 본연구에서는, 이러한나노복합소재형태의양극소재를처음으로 KIB에응용하였으며성능을개선시킬수있었다. KF-VPO 4 나노복합소재는첫충전을통해호스트가형성된후 (KF+VPO 4 K + +e - +VPO 4 F), 호스트에 K + 이온이삽입 / 탈리되며충 / 방전이이루어지게된다 (K + +e - +VPO 4 F KVPO 4 F). K/K + 대비 V의전압구간에서, 첫방전시에는 80 mah/g의방전용량을나타냈지만사이클이지날수록고전압구간에서의방전용량이점진적으로늘어나 30번째방전시 112 mah/g을보이게된다. 이는기존에보고된 KVPO 4 F 양극소재의방전용량 (70 mah/g) 에비해매우큰값이다 [2]. XRD와 F-K edge XAS를통해 KF의분해를확인하였고 V-K edge XAS를통해 V의산화 / 환원을확인하였다. [1] Jung, S.-K., et al., Nature Energy 2, (2017). [2] Chihara, K., Chem. Commun. 53, 5208 (2017). S21-1 Development of Alloy-based Nanocomposite Anodes for High-Performance Rechargeable Batteries 고성능이차전지를위한합금계복합음극소재개발김상옥 *. 한국과학기술연구원 Alloy-based anodes have gained considerable attention for realization of high-performance lithium- or sodium-ion battery systems with enhanced safety because of their high theoretical specific capacities and higher operating voltages than graphite. However, the major obstacles associated with the large volume variation during electrochemical reactions result in severe capacity fading and short cycle life, making their implementation into commercial cells quite challenging. In order to overcome this issue, the alloy-based composite anodes are synthesized by applying the active/inactive ceramic matrix concept. The composites are capable of possessing the following advantages: (i) structural reinforcement and suppression of particle agglomeration upon cycling through a mechanically durable buffer; 90 한국세라믹학회

111 구두발표 (ii) enhanced electrochemical reversibility and fast electrode kinetics through nanoscale active materials; (iii) high conductivity and facile electron transport through a conducting phase; (iv) high chemical and electrochemical stability through an electrochemically inert buffer. In this presentation, several alloy-based composite anodes prepared by a low-cost and scalable high-energy mechanical milling will be introduced and the effects of inactive ceramic matrices on the electrochemical performance of the composite anodes will be presented. S21-2 Surface Modification of LiCoO 2 Cathode for High Potential Performance by Facile Stirring in Copper(II) Nitrate Aqueous Solution 고전압영역에서 LiCoO 2 양극물질의수명향상을위한수용액에서교반을통한표면개질법문준영 1*, 김재민 1, 강현철 1, 고낙규 1, 정성훈 1, 조용남 2. 1 인천대학교, 2 전자부품연구원최근전기차및 ESS시스템의중요성이증대되며, 리튬이차전지의에너지밀도를높이려는다양한시도들이진행되고있다. 여전히 LiCoO 2 (LCO) 는쉬운합성방법및우수한속도특성으로가장대표적인양극소재로써이용되고있으며, LCO의 4.2 V 이상고전압영역에서발생하는 Hexagonal phase에서 Monoclinic phase으로상전이및표면퇴화거동을완화하고자, 표면개질연구를진행하였다. 본발표에서는 LCO 분말을 Cu(NO 3 ) 2 수용액에넣고상온에서일정시간교반시키는간단하고효과적인표면개질법을제시한다. 표면개질한 LCO 표면은 ICP-MS, XRD, SEM, XPS, TEM 분석을통하여, 표면에형성된구리를포함한코팅층을확인했다. 이때, 새로형성된코팅층은나노스케일로아주얇기때문에표면개질된 LCO의 XRD 패턴에서구리와관련된추가적인픽은나타나지않았고, TEM 분석을통해표면개질한 LCO 표면에서스피넬구조 (Spinel structure) 를갖는코팅층을확인했다. 리튬과 LCO로구성된반쪽전지의전기화학분석결과에서표면개질한 LCO는 4.4 V 고전압영역에서우수한수명특성과높은쿨롱효율을보였다. 여기서표면개질하지않은 LCO는사이클이진행되면서높은분극과함께급격한용량감소를보였고 EIS 분석결과에서사이클이진행되면서큰폭으로상승하는전하전달저항을확인했다. 4.4 V까지충전된전지를 60 o C 고온에서 24시간동안보관실험했을때, 표면개질한 LCO는낮은자가방전률을보이며표면에서발생하는원치않는부반응을효과적으로억제된것으로보인다. 이러한결과를통해, LCO 분말을저농도의질산구리수용액에넣고상온에서일정시간교반시키는표면개질법이고전압영역에서 LCO의수명을향상시키는데효과적임을확인하였다. S21-3 Development of New Electrode Materials with Layer- and Tunnel- Structure for Rechargeable Sodium-Ion Batteries 층상및터널구조기반의새로운나트륨이차전지소재개발에대한연구남경완 1*, Deu Bhange 1, Ghulam Ali 2, 박재호 2, 정경윤 2. 1 동국대학교, 2 한국과학기술연구원 Rechargeable sodium ion batteries (SIBs) are now attracting special attention with great cost advantage over rechargeable lithium ion batteries (LIBs) especially in the field of the large scale applications. For the successful development of the SIBs, it is pivotal to find new cathode and anode materials with high capacity, high power and long cycle life. With this perspective, we have examined the electrochemical properties of highly ordered, honeycomb layered oxide Na 3 M(II) 2 M(V)O 6, with monoclinic super structure for the cathode material in SIBs. One of this class materials, Na 3 Ni 2 BiO 6, is able to reversibly deliver specific discharge capacities of up to 109 mah/g with very flat voltage plateaus ~3.5 V vs. Na/Na +. Structural changes occurring during charging/discharging investigated by using in situ X- ray diffraction (XRD) are correlated with its long cycle life. Long and short range structure changes at various state of (dis)charge have been also probed ex situ by using combined synchrotron based high resolution x-ray powder diffraction and extended X-ray absorption fine structure (EXAFS) analysis. For the anode materials, various compositions of transition metal oxides including Ti, Fe and Sn elements having tunnel based structures are explored as rechargeable SIBs. Detailed electrochemical results combined with structural characterization will be discussed during the presentation. S21-4 Ultracapacitive Energy Storage Using 2D Nanomaterials Under Extreme Conditions 2차원나노소재를이용한극한조건에너지저장박호석 *. 성균관대학교 With increasing demand for high performance energy storage devices, the feasibility of reliable and functional energy storage devices that well operates under extreme conditions is of prime importance for expanding applicative fields as well as for understanding materials intrinsic and extrinsic properties and device physics. 1-8 In this talk, I will introduce the control in the physical structure and chemical composition of 2D nanomaterials for ultracapacitive energy storage devices under limited circumstances, where conditions are classified into thermodynamic (e.g. pressure, volume and temperature) and kinetic (e.g. high rate and frequency) variables. 1-8 In addition, a fundamental foundation via in-situ spectroscopic techniques will be presented to understand charge storage phenomenon of new materials and devices occurring on a nanoscale under various circumstances. 7,8 [2] Ho Seok Park*, et al. ACS Nano., 2015, 9, [3] Ho Seok Park*, et al. Adv. Funct. Mater., 2015, 25(7) (Cover). [4] Ho Seok Park*, et al. ACS Nano, 2011, 5 (9) [5] Ho Seok Park*, et al. Adv. Energy Mater., 2016, 6, (Cover). [6] Ho Seok Park*, et al. ACS Nano, 2011, 5 (6) [7] Ho Seok Park*, et al. Nano Energy, 2015, 15, [8] Ho Seok Park*, et al. Nano. Lett., 2015, 15 (4), S21-5 Hybrid Ni-metal Foam Electrode for High-performance Non-aqueous Redox Flow Batteries 비수계 RFB용전기화학성능향상을위한 Ni 금속 foam 기반의복합전극개발김기재 *. 서울과학기술대학교 Electrodes composed of multi-layered graphene grown on a metal foam (GMF) were prepared by directly growing multi-layer graphene sheets on a three-dimensional (3D) Ni-foam substrate via a selfcatalyzing chemical vapor deposition process. The multi-layer graphene sheets are successfully grown on the Ni-foam substrate surface, maintaining the unique 3D macroporous structure of the Ni foam. The potential use of GMF electrodes in non-aqueous redox flow 한국세라믹학회 91

112 2017 년한국세라믹학회추계연구발표회 batteries (RFBs) is carefully examined using [Co(bpy) 3 ] +/2+ and [Fe(bpy) 3 ] 2+/3+ redox couples. The GMF electrodes display a much improved electrochemical activity and enhanced kinetics toward the [Co(bpy) 3 ] +/2+ (catholyte) and [Fe(bpy) 3 ] 2+/3+ (anolyte) redox couples, compared with the bare Ni metal foam electrodes, suggesting that the 2D graphene sheets having lots of inter-domain defects provide sufficient reaction sites and secure electric-conduction pathways. Consequently, a non-aqueous RFB cell assembled with GMF electrodes exhibits high coulombic and voltage efficiencies of 87.2 and 90.9%, respectively, at the first cycle. This performance can be maintained up to the 50th cycle without significant efficiency loss. Moreover, the importance of a rational electrode design for improving electrochemical performance is addressed. S21-6 Sb/SiOC Composite as an Anode Material for Sodiumion Batteries 나트륨이온전지용안티몬-실리콘옥시카바이드복합소재의설계및전기화학적특성최원창 *, 이용호. 한국과학기술연구원 Sodium-ion batteries (SIBs) have attracted significant attention for electrochemical energy storage and conversion owing to the environmental friendliness, natural abundance and low cost of sodium compared to lithium. Among all proposed anode materials for SIBs, antimony (Sb) has been considered to be a promising candidate for anodes due to its high theoretical capacity (660 ma h g -1 ). Despite the high gravimetric capacity advantage, these alloy-based anodes suffer from unsatisfactory electrochemical performance originating from inherent huge volume changes and sluggish kinetics during repeated sodiation/desodiation. Herein, we synthesize the Sb-embedded SiOC composites by pyrolysis of antimony acetate with SiOC precursor to improve the sodium storage performance of Sb as anode for SIBs. The structural and morphological characterizations reveal the Sb nanoparticles are homogeneously embedded into the amorphous SiOC matrix. The Sb-embedded SiOC composite electrodes exhibits high sodium storage capacity and maintain the stable cycling performance. The superior electrochemical performances of the Sb-embedded SiOC composite are due to the uniform distribution of Sb nanoparticles in SiOC matrix, which provides buffering matrix for effective release of mechanical stress during sodiation/desodiation and suppress the agglomeration of Sb particles. This facile structural design and synthetic method can potentially be extended to other sodium-alloy materials for high capacity-sibs. S21-7 Sulfide Solid Electrolytes for Next Generation Batteries with High Ionic Conductivity and Stability 차세대전지용고이온전도및고안정성황화물고체전해질김경수 *, 박제식, 조우석. 전자부품연구원리튬이차전지는휴대용기기의전원으로널리사용되어왔으며, 최근에는하이브리드및전기자동차, 전력저장장치에도탑재되는등대형화되고있다. 이러한리튬이차전지의대형화및고에너지밀도화에따라서안전성에대한우려가높아지고있으며, 안전성우려를해결하기위한기술로서종래가연성의유기액체전해질을불연혹은난연성의고체전해질로변경한전고체전지가주목받고있다. 그러나액체에비해낮은이온전도도로인해실제전지에의적 용은어려웠는데최근상온에서유기액체전해질과동등수준의이온전도도를갖는결정계황화물고체전해질 Li 10 GeP 2 S 12 (LGPS) 가동경공업대학칸노교수연구팀에의해발표되며관련된연구가급증하고있다. 또한황화물고체전해질은무른입자특성으로인해분말을가압해서펠렛으로만드는것만으로도비교적충분한활물질과고체전해질과의접촉면적을형성할수있는장점이있어압력셀을이용한전지특성구현이보고되고있다. 그러나, 수분과의반응성이높아대기중에서취급이어려우며, 황화수소가발생되는문제로인하여실제전지에의적용을위하여는안정성의개선도함께요구되어지고있다. 관련하여황화물고체전해질의높은이온전도도와우수한안정성을확보하기위한최근연구에대하여보다상세히알아보고자한다. S22-1 Redox Stability of La 0.6 Sr 0.4 Fe 1-x Sc x O 3-δ for Flat-tubular Solid Oxide Cells Interconnector 평관형고체산화물전지접속자용 La 0.6 Sr 0.4 Fe 1-x Sc x O 3-δ 의산화- 환원안정성최현종 1*, 곽민준 2, 김태우 1, 서두원 1, 우상국 1, 김선동 1. 1 한국에너지기술연구원, 2 과학기술연합대학원대학교 Sc-substituted La 0.6 Sr 0.4 FeO 3-δ (LSFSc) has been synthesized for utilization as an integrated ceramic interconnector of tubular-solid oxide cells (SOCs). Redox stability and electric conductivity of LSFSc were improved by optimizing the scandium (Sc) doping concentration, the ph of the synthetic solutions and the calcination temperature of the organic precursors. The crystalline phases of LSFSc were stable when the ph of the synthetic solution was below 2 and the calcination temperature was over 1200 C. As the Sc concentration increased, redox stability was improved while the electrical conductivity decreased. To consider the trade-off relationship between electrical conductivity and phase stability, La 0.6 Sr 0.4 Fe 0.9 Sc 0.1 O 3-δ can be considered as one of the stable compositions for an integrated ceramic interconnector of tubular-socs. S22-2 Improvement in the Durability of Electrodes of Flat Tubular Cells for High-temperature Steam Electrolysis and Cyclic Operation 평관형양방향수전해셀의전극안정성확보최성민 *, 박만수, 이종호, 김병국. 한국과학기술연구원양방향수전해의장점은단일시스템에서에너지저장을위한 SOEC 및전력공급을위한 SOFC로양방향순환작동이가능하다는것이다. 즉, 고온의수증기를이용해고순도수소를생산및외부에저장하고전력부하가높은피크타임에는저장된수소를연료로사용하여전력을생산함으로써그리드수요에맞추어안정적인전력을공급할수있기때문에신 재생에너지이용및저장의관점에서최적의기술이라고할수있다. 이러한양방향가역연료전지기술의장점을살려실질적상용에너지저장시스템기술로발전시키기위해서는고온전환운전시단전지및스택의성능을극대화하고제품으로서의신뢰성을확보할수있는체계적인연구개발이필요하다. 현재까지확보한 SOFC용세라믹소재 공정기술을바탕으로평관형양방향수전해셀에최적화된구성소재, 공정기술및미세구조제어기술을개발함으로써수전해성능을향상시키고평관형양방향수전해셀의전극안정성확보하고자한다. 92 한국세라믹학회

113 구두발표 S22-3 Compositional Dependency of Thermal Properties of Glasses Based on SiO 2 -B 2 O 3 -BaO System for High Temperature Reversible Solid Oxide Cells SiO 2 -B 2 O 3 -BaO계기반 RSOC 고온미봉용유리소재의조성에따른열적특성이한솔 *, 정운진, 김성현, 이지애. 공주대학교평관형고체산화물연료전지는고전력밀도의평판형셀과높은열응력저항및기계적강도를가진원통형셀의장점을동시에가진연료전지로서, 각각의셀은적층한스택구조로사용하며, 전기화학반응을역으로진행시키는수전해장치 (SOEC: Solid Oxide Electrolyzer Cell) 로도사용이가능하다. 이러한평관형고체산화물연료전지는산화제및환원제공급부를격리하기위한밀봉이중요하며, 일반적으로 700 o C 이상고온에서작동하기때문에고온밀봉소재기술이 RSOC의효율및수명을좌우한다. 이밀봉재는동작시밀봉재, 매니폴드, 전극금속간의열팽창계수차이를최소화하여가스누출을차단해야하며, 고압의스팀사용에따른우수한밀봉성이요구된다. 또한, 작동온도에서는유동이없고고온부식이발생하지않는온도에서밀봉이가능한소재가요구된다. 본연구에서는 RSOC 밀봉소재로써 SiO 2 -B 2 O 3 -BaO 조성계의유리를탐색하였다. SiO 2 -B 2 O 3 -BaO 조성계내조성에따른다양한유리를제조하고, 800 o C 및 900 o C에서 flow button test를통해유동성을확인해보았다. 이를통해, 800 o C에서는유동이없으며 900 o C에서는우수한유동성을갖는조성을선정하고열팽창계수를측정하여기판의열팽창계수인 / o C와유사한조성을우수조성으로선정하였다. 또한, 조성에따른열특성분석을위해 DTA 등의열분석을실시하였다. 실제사용되는전해질기판소재위에서의소성을통해기판과의접착특성을확인하여밀봉소재로써의가능성도확인하였다. S22-4 Development of a CFD Model for High-temperature Two-way Steam Electrolysis 고효율양방향고온수전해열유동전산해석기술개발유재영 *, 강주현, 강성민, 배중면. 한국과학기술원기후변화대응및신재생에너지개발을위한연구가활발히진행된가운데, 수소생산및저장이주목받고있다. 수소는높은열량을포함한여러장점이있지만, 주로탄화수소개질공정을통해생성되므로이산화탄소가발생하고화석연료가고갈된다. 이러한단점을완화하기위해서는수전해또는수전해전지를고려할수있는데, 여기서요구되는에너지가이산화탄소발생과연관되므로요구전력을최소화할필요가있다. 따라서, 전지의저항을감소하고높은반응속도를얻기위해서는고온환경이적합하여고체산화물수전해전지 (SOEC) 에관한연구가적합하다. 산업공정에서발생하는폐열을사용하여대규모의고온환경을만들고 SOEC 시스템을상용화할수도있지만, 먼저 SOEC 단위셀의성능을살펴보아최적화된조건을찾을필요가있다. 하지만자원, 기술, 시간및여러변수에한계가있기에실험보다는전산해석을수행하여설계조건을평가하는것이더효율적이다. 따라서, 본연구의목적은기존의 SOEC 설계자료와실험조건을참고하여전산해석모형을개발하고, 유동및전기화학반응을포함한다양한물리현상을모사하여실험으로측정할수없는결과를찾고, 설계조건을제안하는것이다. 그결과, 전압, 온도분포및수소, 산소농도를계산할수있었으며향후스택설계조건에따른셀성능을분석할수있다고판단하였다. S kw Solid Oxide Reversible Fuel Cell Stack Operation Results 1 kw급양방향고온수전해-연료전지스택운전평가결과안진수 *, 최영재. 포항산업과학연구원현재포항산업과학연구원 (RIST) 에서는다부처공동기획연구사업에서주관기관인한국에너지기술연구원 (KIER) 의위탁과제를수행중에있으며, 위탁과제명은 양방향고온수전해 -연료전지스택운전기술개발 이다. 본과제에서 RIST는기개발되어있는평판형 1 kw급양방향스택을주관기관 KIER의평가시스템에공급하여운전평가를진행하고, 최적양방향운전로직을개발하는것을주연구목표로하고있다. 1차년도과제기간내, RIST는 1 kw급스택구성요소를평가사이트로운송하여, 조립 / 적층하였고, 평가시스템상에서연료전지모드뿐아니라수전해모드에서도성공적으로운전하였다. 평가는스택의전처리가완료된후, 가열로기준 750 o C와 700 o C에서진행되었으며, 연료전지 / 수전해양쪽모드에서 I-V특성및연료 ( 수소와스팀 ) 이용율을평가하였다. 연료전지모드에서는출력 >1 kw, 발전효율 40% 를달성하였으며, 수전해모드에서는소비전력 > 1.25 kw, 평균전압 1.05 V (@0.4 A/cm 2 ), H 2 O Vol.% = 80%, H 2 O 이용율 45% 를달성하였다. 자세한평가결과는본발표에서논의될예정이며, 100 cm 2 셀단전지의양방향평가결과도추가될것이다. S22-6 Development o f Technology for Improving the Durability of the Hydrogen Electrode in Solid Oxide Electrolyzer Cells (SOECs) 가역운전수전해셀의수소극내구성향상기술개발이민진 *, 황해진, 신재화. 인하대학교고체산화물전해셀 (solid oxide electrolysis cell, SOEC) 은고온에서수증기를전기분해하여수소를제조하는전기화학디바이스이다. SOEC는고체산화물연료전지 (SOFC) 의역반응을활용하는기술이기때문에전력이필요할경우에는수소로부터전기를생산하고부하가감소하면잉여전력을이용하여수소를제조하는차세대전력생산및저장시스템에활용을목적으로하고있다. 한편 SOEC는수소극에고온 / 고압의수증기를공급한다는점과공기극에서는산소가매우빠르게방출된다는점때문에 SOFC에비하여셀및스택의열화가크고상업화의걸림돌이되고있는상황이다. 본연구에서는 SOEC의수소극성능및열화에미치는작동조건의영향에대하여조사하였으며수소극의내구성을향상하기위하여 Ni/YSZ의산화를억제하는소재기술을검토하였다. 수소제조용셀은공기극으로 LSCF를, 수소극으로 Ni-YSZ 사용하여구성하였고전해질 (YSZ) 및전극지지형셀을제조하여실험에사용하였다. 제조한셀에대하여 SOFC/SOEC 모드에서의분극저항과 j-v 특성을평가하였다. 수증기분압은 10, 30, 50% 조건에서셀에 0.1 A/cm 2 의전류밀도를인가한상태에서전압의변화를관찰하였으며 SOFC-SOEC 전환운전에따른전압의변화를측정함으로써셀의내구성을평가하였다. 또한수증기분위기에서의연료극 (Ni-YSZ) 의산화를억제하기위하여방식 (anti-corrosion) 기술을응용한복합화연료극을제조하였고산화방지가능성을검토하였다. S22-7 Synthesis of Nano-sized LSCF (Lanthanum Strontium Cobalt Iron Oxide) Powders by Suspension RF Thermal Plasma Spraying 현탁액고주파열플라즈마스프레이공정을이용한 LSCF 나노분말합성 한국세라믹학회 93

114 2017 년한국세라믹학회추계연구발표회 서준호 *, 이미연, 남준석, 양시영. 전북대학교본연구에서는현탁액의고주파열플라즈마스프레이공정을이용하여고체산화물연료전지용페롭스카이트구조의 LSCF 나노분말을합성하였다. 이를위해, Lanthanum, Strontium, Cobalt, Ferrite 의각성분이함유된 nitrate 를분말을 La : Sr : Co : Fe = 6 : 4 : 2 : 8 at% 비율로정량하여 1.5 M 농도의수용액을준비하고, 준비된용액에 1.45 M 농도의 Glycerin 을첨가하여현탁액을제조하였다. 제조된현탁액을 Plate power 기준 60 kw 출력규모로생성된열플라즈마불꽃속으로주입시, 현탁액공급속도 (18 ml/ min, 26 ml/min), 공정압력변화 (45 kpa, 55 kpa) 에따른분말미세구조, 입도분포, 결정구조등의변화에대해 FE-SEM, TEM, PSA, XRD, ICP-OES 등을이용하여관찰하였다. S23-1 Mixed Matrix Membranes for High Performance C 3 H 6 / C 3 H 8 Separation C 3 H 6 /C 3 H 8 분리를위한고성능하이브리드분리막이종석 *. 서강대학교 Propylene/propane (C 3 H 6 /C 3 H 8 ) separation is one of the most important processes in the petrochemical industry due to the highly utile applications of both gases in our everyday life. Currently, C 3 H 6 / C 3 H 8 separation is implemented by utilizing highly energy-intensive cryogenic distillation due to similar physical properties between them (i.e., T b of C 3 H 6 and C 3 H 8 is and C, respectively). If the drawbacks of polymeric membranes are resolved, membrane-based separation technique can be a good auxiliary candidate in reducing energy use over the conventional cryogenic distillation process. Mixed matrix membranes (MMMs) are essentially hybrid membranes consisting of molecular sieves as a dispersed phase for exceptional separation performance and polymeric membranes as a continuous phase for good processability. In this talk, I will present the current progress in developing MMMs for C 3 H 6 /C 3 H 8 separations. S23-2 Microporous Material-based Membranes 미세다공성물질기반의분리막김은주, 최정규 *. 고려대학교 Microporous zeolite membranes are highly desirable for separating gas molecules (here, CO 2 ) from other slightly larger molecules (here, N 2 ). Considering that the sizes (estimated from the kinetic diameter) of CO 2 and N 2, are 0.33 and nm, an appropriate choice of a zeolite whose pore sizes lies in-between can allow for securing a molecular sieving effect. In this study, we would like to address how to choose a zeolite type and make a continuous membrane out of the chosen zeolite. S23-3 Development of Pervaporation System by using Zeolite Membrane and Dehydration Pilot Test 제올라이트분리막을이용한투과증발시스템과탈수성능평가정재칠 *, 김동현, 전오성, 유상수, 김현철, 육종묵, 노영석. ( 주 ) 파인텍 α-alumina(al 2 O 3 ) 로제작된 Tube type의 Porous Support의외부에수열합성법으로 NaA제올라이트분리막을합성하여 Pervaporation membrane 및 Module을개발하였다. 특히, Pervaporation membrane 은길이 700 mm, 외경 12.5 mm의 Support 외부에제올라이트분리막이합성되어있어 Out-In의투과방향을갖는다. 개발된 Pervaporation membrane은유효면적 0.6 m 2 M의 Module로개발하였으며, Module housing은길이 1,100 mm, 외경 125 mm의크기 를갖으며, Feed / Retentate port : 3/4", Permeate port : 1.5S SNT Flange, Gauge port : 1/2" 를갖는다. 투과증발장치는 Feed Tank, Permeate Tank, Memebrane module, Heater, Chiller, Heat exchanger 로구성되었으며, 10 L, 250 L, 1,000 L 의용량으로개발되었다. 투과증발성능평가는막면적 0.02 m 2 의유효면적을갖는단일분리막을이용하여수행하였으며, 다양한종류의유기용액을대상으로성능평가를수행하였다. 이논문은 2017 년도한국연구재단국제협력사업의지원을받아연구되었음 (NRF-2016K1A3A1A ). S23-4 A Zeolite Membrane Module Composed of SAPO-34 Hollow Fibers for Use in Fluorinated Gas Enrichment SAPO-34 분리막모듈을이용한불화가스분리이평수 *, 박유인. 한국화학연구원 A membrane module composed of SAPO-34 hollow fibers was constructed for the enrichment of NF 3, a strong greenhouse gas with a 100-year global warming potential (GWP)* of > 17,000. Growth of the SAPO-34 membrane was investigated on the alumina hollow fibers using in-situ growth and secondary growth methods. Heterogeneous nucleation of SAPO-34 crystal took place on the surface because of hetero-atoms existing on the support, contributing to early development of continuous zeolite film. Zeolite membranes were successfully prepared from both in-situ and secondary growth. The membrane prepared by secondary growth presented N 2 permeance as high as GPU with an N 2 /NF 3 gas selectivity of A SAPO-34 membrane module was assembled using the hollow fiber membranes produced by secondary growth, but separation performance of the module was reduced to N 2 permeance of GPU with an N 2 /NF 3 gas selectivity of When used for the enrichment of NF 3 gas, a superior yield (98%) and enrichment ratio (20) were obtained from the module at a stage-cut of * A measure of how much energy the emission of 1 ton of a gas will absorb over 100 years, compared to the emission of 1 ton of carbon dioxide (CO 2 ) S23-5 Mixed-Matrix Membranes with Metal-Organic Frameworks and Metal-Organic Polyhedra for Efficient CO 2 Separation 효율적인이산화탄소분리를위한금속-유기구조체와금속-유기다면체가포함된혼합기질분리막의제조김현욱 *. 한국에너지기술연구원 Metal-organic frameworks (MOFs) and metal-organic polyhedra (MOPs) are emerging hybrid nanomaterials assembled from metal ions and organic ligands. These hybrid nanomaterials have drawn attractive attention because of their tunable pore size, and gas adsorption and separation properties. In this work, we synthesized hydrophilic MOFs and MOPs, and determined their crystal structures by X-ray crystallography. A close inspection of crystal structures revealed that these hybrid nanomaterials have strong adsorption sites toward CO 2. Such a strong affinity toward CO 2, motivated us to fabricate mixed matrix membranes by addition of MOFs or MOPs in polymer matrix. The membrane performance for CO 2 /N 2 separation were improved with increasing the amount of the MOFs or MOPs. Details of the work will be presented. 94 한국세라믹학회

115 구두발표 S23-6 Electrochemical Ammonia Synthesis using Solid State Ion Conducting Membranes 이온전도성분리막을이용한전기화학적암모니아합성유충열 *, 윤형철, 김종남. 한국에너지기술연구원 Besides its current applications, ammonia (i.e. carbon-free fuel) could play important roles in preparing for oil depletion and coping with climate change since it releases only nitrogen and water when burned. Ammonia contains 17.6 wt% of hydrogen and has significant advantages over hydrogen in storing and transporting energy. The current industrial ammonia production is based on the Harbor-Bosch process, which has the drawbacks of high greenhouse gas emission, reaching up to 3.45 ton CO 2 /ton NH 3 and large energy consumption over 30 GJ/ton NH 3 resulting from the production of the reactants and the high pressure-high temperature synthesis of ammonia. In order to avoid the aforementioned drawbacks, an alternative process is the electrochemical synthesis of ammonia from water and nitrogen at atmospheric pressure. In the present contribution, the electrochemical synthesis of ammonia from nitrogen and steam has been experimentally investigated using solid state oxygen ion (O 2- ) and proton (H + ) conducting membranes. The effects of temperature, applied current and electrode composition on the ammonia formation rate will be discussed. G3-1 Ceramics for Fluorine Plasma Environment: Erosion Mechanism and New Plasma Resistant Materials 불소계플라즈마환경용세라믹스 : 식각기구및내플라즈마소재이성민 *, 박상준, 김성원, 오윤석. 한국세라믹기술원 The ceramics are usually exposed to fluorine- or chlorine-based plasma, experiencing erosion due to the interaction with the plasmas as well as producing particulate contaminations. Through high precision X-ray photoelectron spectroscopy, the surface of the ceramics was found to consist of a nanometer thin top C-F polymer layer and the underlying fluorinated oxide layer which is thermodynamically stable. Thus, this result support that erosion of Al 2 O 3 and Y 2 O 3 ceramics under fluorocarbon plasma occurs by a physical removal process with simultaneous surface fluorination which was induced by the interaction with plasma. In these regards, a new dense Y 2 O 3 coating is being studied using several techniques, including physical vapor deposition, aerosol deposition, and suspension plasma spray (SPS). Of these, suspension plasma spray could possibly provide dense Y 2 O 3, which could contribute to reducing contamination particles. In addition to oxides, a new oxyfluoride material with various F content are being developed G3-2 Formation of LuAG-nano YAG Core-shell Structure by Using Pressured Sintering Process 고압소결공정을이용한 LuAG와나노 YAG 코어쉘구조형성황재성 *. LG전자 Core-shell formation through sintering was found and improved optical efficiency compared to sintering was secured. Nano YAG was synthesized using the precipitation of Y(NO) 3 CHO, Al(NO) 3, Ce(NO) 3 and the average size was 320 nm. The average size of LuAG (TKK, japan) was 4.93 um. The mixing ratio of nano YAG and LuAG was 7:3 to improve light efficiency and the mixed powders were sintered in Gas Pressure Sintering. The intering atmosphere was N 2, the pressure of N 2 was 0.5 MPa, and the rate of temperature rise was 10 o C per minute.when the YAG and LuAG were sintered at 1500 C, the YAG grew mainly around the LuAG. In this process, the LuAG- YAG core-shell structure was formed with the LuAG as the core and the YAG as the shell. In this process, In the process of forming the core-shell, Lu was replaced with YAG, which showed an increase in YAG crystallinity and a change in color coordinates. As a result, Lu substituted YAG and LuAG showed a luminance increase of about 5% compared to that before sintering. G3-3 Fabrication of Transparent MgAl 2 O 4 Spinel via Sprayfreeze-drying of Microfluidized Slurry Microfluidization/Spray-Freeze-Dyring 공정에의한 MgAl 2 O 4 스피넬투명세라믹의제조김하늘 *, 김진명, 김미주, 고재웅, 박영조. 재료연구소 Spherical granules were prepared from a monodispersed slurry by combining the microfluidization method and the spray freeze drying (SFD) process. Starting with the prepared granules, transparent MgAl 2 O 4 ceramics were fabricated through the pressureless sintering followed by hot-isostatic-pressing. A comparison with a polydispersed slurry prepared by ball-milling method showed successful fabrication of a mono-dispersed state by microfluidization method, and 80% of visible in-line transmittance was obtained at 600 nm wavelength from a process starting with the monodispersed slurry of low solid content. Microstructural analysis of the green bodies, presintered bodies and hot-isostatic bodies of MgAl 2 O 4 ceramics, revealed that the slurry dispersion process should be controlled to a high level in order to suppress scattering sources such as pores and microcracks affecting the in-line transmittance of visible light. G3-4 Fabrication and Characterization of Highly Transparent Er:Y 2 O 3 Ceramics with ZrO 2 and La 2 O 3 Additives ZrO 2 /La 2 O 3 소결조제에의한투명 Er:Y 2 O 3 소결주린린 *, 박영조, 김하늘, 고재웅. 재료연구소 In this study, we report highly transparent Er:Y 2 O 3 ceramics (0-10 at.% Er) fabricated by a vacuum sintering method using compound sintering additives of ZrO 2 and La 2 O 3. The transmittance, microstructure, thermal conductivity and mechanical properties of the Er:Y 2 O 3 ceramics were evaluated. The in-line transmittance of all of the Er:Y 2 O 3 ceramics (1.2 mm thick) exceeds 83% at 1100 nm and 81% at 600 nm. With an increase in the Er doping concentration from 0 to 10 at.%, the average grain size, microhardness and fracture toughness remain nearly unchanged, while the thermal conductivity decreases slightly from 5.55 to 4.89 W/m K. A nearly homogeneous doping level of the laser activator Er up to 10 at.% in macro-and nanoscale was measured along the radial direction from the center to the edge of a disk specimen, which is the prominent advantage of polycrystalline over single-crystal materials. Based on the finding of excellent optical and mechanical properties, the compound sintering additives of ZrO 2 and La 2 O 3 are demonstrated to be effective for the fabrication of transparent Y 2 O 3 ceramics. These results may provide a guideline for the application of transparent Er:Y 2 O 3 laser ceramics. 한국세라믹학회 95

116 2017 년한국세라믹학회추계연구발표회 G3-5 Transparent Spinel by Hot Press Hot Press에의한스피넬의투명소결박영조 *, 주린린, 김하늘, 고재웅. 재료연구소스피넬 (MgAl 2 O 4 ) 은여러종류의투명세라믹스중상대적으로고강도이면서저온소결이가능하다는장점을가지고있다. 동소재는가시광및중적외선영역까지고투광성을나타내기때문에방탄또는유도무기의센서윈도우로사용이가능하다. Hot Press에의한투명스피넬의소결시, LiF를소결조제로사용하는것이일반적으로알려져있다. 본연구에서는소결조제를첨가하지않은순수한스피넬을 HP소결에의해투명화를시도하였다. 이때카본의영향을억제하기위해성형체를 Ta 호일로둘러싼상태로소결하였다. 스피넬분말의전처리방법및 HP소결의온도와압력이미세구조및투광성에미치는영향을분석하였다. 투광도는 1600 o C/ 100 MPa 조건에서가장우수하였으나, 미세구조및물성은최적화조건이상이하였다. G3-6 Effects of Joining Temperature on the Properties of Brazed GDC-LSM/Metal Joints f o r Oxygen Transport Membranes 산소수송막에대해브레이징된 GDC-LSM / 금속접합의물성에미치는접합온도의영향김명동 *, Wahid Muhamad FR, Amit Siddharth Sharma, 윤당혁. 영남대학교 Oxygen transport membrane (OTM) is an emerging technique to produce high purity oxygen at low cost by separating oxygen in the air. A module of an OTM may consist of stacked GDC-LSM membranes in a metallic plate, which needs hermetically sealed ceramic/ceramic and ceramic/metal joints to avoid foreign contamination. Regarding the joining, the braze filler typically consists of a noble metal and an oxide compound can be used. Addition of oxide to noble metal is known to assist better wettability with respect to the base materials. Reactive air brazing (RAB) with Ag-CuO filler was utilized to join GDC-LSM with different metals in this study. Optimal conditions in terms of brazing temperature and time were tried to be found. Microstructure and mechanical strength of the joints were analyzed by SEM-EDS and shear stress test, respectively. Correlation between the various phases formed at the joints at different joining temperatures, joint microstructure, thickness and their effect on the joining strength will be presented. G3-7 Properties of SiC f /SiC Joined Using PCS and PSZ Preceramic Polymers PCS 및 PSZ를사용한 SiC f /SiC 접합의특성정동혁 *, Pipit, Amit Siddharth Sharma, 윤당혁. 영남대학교 SiC f /SiCs are the best candidate of the blanket materials for future fusion reactors, which is expected to have a complex shape. However, various current fabrication processes can only produce simple shapes, such as plate and tube, owing to the utilization of hot press along with a graphite mold. Because their practical utility can only be realized by integrating simple shapes into complex geometries, however, the joining using SiC-based fillers having properties similar to the base materials are desirable. Cracks and pores generated by the evolution of gaseous products should be avoided as these can compromise the mechanical strength. In this aspect, monolithic SiC and SiC f /SiC were joined using preceramic polymers, such as polycarbosilane (PCS) and polysilazane (PSZ), as a preliminary test. Optimization for the polymer composition, choice of filler and content, joining temperature and pressure was conducted. Especially, the joining pressures of 3.5 and 20 MPa and temperatures of C were examined. Joining strength using a 3-point configuration was estimated and correlated with the interfacial microstructure, mode of failure as well as the joint thickness. G3-8 Alumina-Alumina Joining by Reaction-Bonded Aluminum Oxide (RBAO) Process using Al/Al 2 O 3 Powder Mixture Al/Al 2 O 3 혼합분말의알루미나반응소결공정 (RBAO) 을이용한알루미나-알루미나접합김태경 *, 이현권. 금오공과대학교세라믹스는분말을성형한후소결하는제조공정상복잡한형상을제조하는데제약이존재한다. 일반적으로소결후가공을통해복잡한형상의제품을제조하고있으며, 이로인해전체생산비용에서가공비용이가장큰비중을차지하고있다. 이러한문제점을극복하기위해금속및유리질을활용한세라믹스접합방법이사용되고있다. 하지만세라믹스단일체에비해접합체의강도및고온특성, 화학적안정성등의물리화학적특성이상대적으로낮아사용상제약을야기한다. 이러한문제점을해결하기위해세라믹나노분말및 sol, paste등의접합재를활용한세라믹 -세라믹접합에대한꾸준한연구가진행되고있다. 본연구에서는알루미나 -알루미나접합에 RBAO공정을이용하여접합알루미나세라믹스를제조하였다. RBAO공정을이용하기위해 Al/Al 2 O 3 출발혼합분말을유성구볼밀로분쇄한후현탁액을제작하여, 알루미나성형체의접합재로사용하였다. 접합재내금속 Al분말의반응소결과 1650 o C에서 2시간상압소결하여접합알루미나세라믹스를제조하였으며, 제조된접합알루미나의접합면과접합강도를 SEM, 2축강도분석을통해관찰하였다. G3-9 Improved Thermal Conductivity of Sintered Reactionbonded Silicon Nitride using a BN/Graphite Powder Bed 질화붕소 / 흑연분위기분말사용에의한반응결합질화규소의열전도도개선리인셩 *, 김하늘, 김미주, 고재웅, 박영조. 재료연구소 Sintered reaction-bonded silicon nitride (SRBSN) is a promising substrate material for high-power electronic devices, due to its excellent thermal and mechanical properties. Oxygen is widely recognized as one of the most detrimental impurities to the thermal conductivity of Si 3 N 4 ceramics. In order to fabricate SRBSN with improved thermal conductivity, a BN/graphite powder bed was used during nitridation and post-sintering processes. Owing to the strong reducing ability of graphite, the BN/10 wt% C powder bed could significantly facilitate the removal of SiO 2 from Si compacts during nitridation, resulting in altered chemistry of secondary phase, larger rod-like β-si 3 N 4 grains, and lower lattice oxygen content in the RBSN product. Moreover, the BN/10 wt% C powder bed further promoted the removal of SiO 2 and then enhanced the elimination of residual Y 2 Si 3 O 3 N 4 secondary phase during post-sintering, which thus induced more pronounced grain growth, decreased lattice oxygen content and increased Si 3 N 4 -Si 3 N 4 contiguity in the final SRBSN. Benefiting from the decreased lattice oxygen content and the optimized microstructure, the SRBSN sample obtained great improvement in thermal conductivity from 86 to 121 W m -1 K -1 without distinct decrease in 96 한국세라믹학회

117 구두발표 electrical resistivity after the use of BN/graphite instead of BN as powder bed. G3-10 Fabrication of Safe and High Performance Li-ion Battery using Additive Manufacturing 적층공법을이용한고성능 / 고안전리튬이온배터리개발배창준 *. 재료연구소 Various applications of high performance ceramics, especially Li-ion battery and 3D ceramic mold, developed by Additive manufacturing will be discussed. In the Li-ion battery, we will discuss theoretically and experimentally an ordered, dual-scale porosity distribution which facilitates electrochemical lithiation/de-lithiation and maximizes power available from dense, thick electrodes targeting high energy density. In the 3D ceramic mold, using the layer-by-layer growth enabled by CerSLA eliminates the pattern and produces a one-piece mold integrated with the core, or an Integrally Cored Ceramic Investment Casting Mold (ICCM). G3-11 Silicon Nitride Structures from Photo-induced 3D Printing 광경화 3D 프린팅을통한질화규소의 3차원조형정경운 *, Nenko S. Nenov, 배창준. 재료연구소 3D 프린팅에서범용적으로사용되고있는고분자재료들에비해, 세라믹재료의 3D 프린팅은세계적으로많은관심을받고있는흥미로운연구주제라고할수있다. Digital light processing과같은광경화 3D 프린팅공정에질화규소와같은세라믹재료를적용하기위해서는, 광경화성세라믹잉크의공정성확보가중요하며, 특히고밀도구조체확보를위한고충진세라믹잉크의경우그공정성확보가더욱어려워진다. 따라서, 세라믹재료의 3D 프린팅적용을위해서는공정기술에대한이해와더불어재료원천기술확보가필수불가결하다고할수있다. 본발표에서는세라믹잉크를구성하는광경화성유기재료시스템의특성조절을통한고충진질화규소잉크의공정성확보와더불어 3D 프린팅을통한 3차원구조체형성에대해서다루고자한다. 특히, 광경화성유기분자의세라믹잉크선택적용을통한충진도 50 vol% 이상고충진잉크의저점도화 / 공정성확보를바탕으로 digital light processing을통한 3차원구조체제작및 post thermal processing을통한고밀도질화규소소결체제작에대해논의하고자한다. G3-12 A Novel Approach for High Performance Lithium Ion Batteries Fabricated by Additive Manufacturing 박수진 *, Arathi, 이희정, 정경운, 이세훈, 배창준. 재료연구소화석에너지를대체하기위한리튬이차전지는스마트기기와같은소형전지부터드론, 전기차및에너지저장시스템과같은중대형전지까지다양한분야에서활발히사용되고있다. 하지만기존의 slot coating 기반전극은 PVdF 바인더용해를위해인체및환경에유해한오염물질로널리알려진 N-methylpyrrolidone (NMP) 용매를사용해야한다. 또한 NMP 용매는전량수입에의존하고있으며건조과정에서배기되는 NMP를처리하기위한특수장비세팅이요구되어공정비용을증가시키는문제점을가지고있다. 이러한문제점을해결하기위해수계바인더를사용하는등다양한연구가진행되었지만아직적합한해결책을찾지못한실정이다. 본그룹에서는기존 slot coating, NMP 용매및 PVdF 바인더시스템기반의문제점을해결할대안으로 Additive manufacturing 과경화성바인더연구를진행중이다. 이번발표에서는멀티소재및 3차원배터리전극제작이가능한 Additive Manufacturing 을소 개하고 LCO 양극소재및경화성바인더기반배터리양극잉크의특성및전기화학테스트결과를보고하고자한다. G3-13 Engineering Battery Electrode Microstructure for Improved Li ion Transport Arathi *, 박수진, 이희정, 정경운, 배창준. 재료연구소 Battery design involves navigating a compromise between energy and power requirements. Ultra-thick electrodes designed with anisotropic structures such as channels to direct ion transport improve energy density with fewer compromises on power requirements. Transport is not 1-dimensional as assumed in porous electrode models in these engineered structures. The simplified 1-dimensional porous electrode models framed to obtain limiting capacity and current guidelines have the same form as the diffusion -convection equation. We have non-dimensionalized the 2-dimensional diffusion convection equation to reveal that the simpler transport equations can be reformulated in terms of a characteristic length describing the introduced structure and obtain guidelines for the thickness, convection, and length for engineered electrodes (i.e. cathodes with channels, electrolyte pockets, alternating structures). Ongoing work seeks to resolve intuition from porous electrode models on solventbulk transport interactions and electrochemistry and this simplified model, as well as correlate with tangible experimental values. G3-14 Development of Flexible Zeolite Nanofiber with High Surface Area and High Strength by Wet Etching Process 습식에칭에의한고비표면적고강도유연한제올라이트나노섬유개발김경원 1*, 지상현 2, 박복성 1, 나정연 3, 윤지선 2. 1 ( 주 ) 신명엔텍, 2 한국세라믹기술원, 3 동아대학교 For the synthesis of the flexible zeolite nanofibers with a high surface area, flexible as-spun zeolite nanofibers were prepared by an electrospinning method, and the as-spun nanofibers have structures in which the zeolite particles are embedded in the poly(vinylidene fluoride)(pvdf)/polyvinylpyrrolidone(pvp) core-shell nanofiber mats. Zeolite particles were exposed on the surface of the nanofibers by wet etching process of PVP polymer in the shell, which process played an important role in increasing the specific surface area. Furthermore, PVDF polymer in the core acted as a skeleton of nanofibers and contributed to increasing the strength of the nanofibers. The morphology of the partially etched polymer surface of the flexible zeolite nanofiber was observed by FE-SEM and FE-TEM analysis, and the specific surface area of the flexible zeolite nanofibers was measured by N 2 adsorption/desorption isotherms. G3-15 Fabrication of ZrB 2 Slurry with High Solid Loading and High Dispersity through Surface Treatment 표면처리를통한고분산성을갖는고함량의 ZrB 2 슬러리제조신재록 1*, 안계석 1, 허재욱 1, 박형빈 2, 이현승 1, 최성철 1. 1 한양대학교, 2 한국세라믹기술원 Zirconium diboride (ZrB 2 ) is one of ultra-high temperature ceramics (UHTC) which has excellent thermal and mechanical property. For manufacturing the complex-structured UHTC sintered body with high density, it is needed to fabricate high solid loading slurry having low 한국세라믹학회 97

118 2017 년한국세라믹학회추계연구발표회 viscosity for filling mold well. For this reason, a lot of research have been done about the solvents and surfactants which can improve dispersion property. Therefore, in this study, research about surface treatment was performed for giving property like electrostatic and steric hindrance to ZrB 2 particles. Surface of particle was modificated by polyethylenimine (PEI) and polyacrylic acid (PAA) for functionalization of amine and carboxyl groups, respectively. Microstructure and surface functional groups of treated-zrb 2 were verified by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Dispersion property was certificated through zeta potential and particle size distribution analysis, and analysis about rheological property of the ZrB 2 slurry with various solid loading was performed. Consequently, the ZrB 2 slurry with 50 vol% solid loading could be fabricated trough the PEI treatment. G3-16 Adsorption/Desorption Characteristics of Toluene over Flexible Zeolite Nanofiber with Different Thermal Etching Temperature and SiO 2 /Al 2 O 3 Ratio 다양한열식각온도및 SiO 2 /Al 2 O 3 비율을갖는유연한제올라이트나노섬유의톨루엔흡착 / 탈착특성지상현 1*, 박복성 2, 윤지선 1. 1 한국세라믹기술원, 2 ( 주 ) 신명엔텍 For slim and compact volatile organic compound (VOC) air purifiers, the flexible as-spun zeolite nanofibers were prepared by an electrospinning method, and then the flexible zeolite nanofibers with high specific surface area were fabricated by a thermal surface partial etching process. The adsorption/desorption characteristics of toluene over the flexible zeolite nanofibers with different thermal etching temperature were investigated by gas chromatography (GC), and the better adsorption/desorption characteristics were observed in the flexible zeolite nanofibers with higher thermal surface etching temperature. Furthermore, the acidity effects on the flexible zeolite nanofibers for the adsorption/desorption characteristics of toluene were investigated as a function of the SiO 2 /Al 2 O 3 ratio of zeolites, and the adsorbent with a lower acidity showed the better characteristics of adsorption and desorption of toluene. G3-17 Improvement of the Structural Health Monitoring Sensor Characteristics based on Piezoelectric Nanofiber Modules by Poling Effect 폴링효과에의한압전나노섬유모듈기반의구조물건강모니터링센서특성향상지상현 *, 윤지선. 한국세라믹기술원 The lead-free piezoelectric ceramic nanofibers of 0.78Bi 0.5 Na 0.5 TiO SrTiO 3 (BNT-ST) piezoelectric ceramics and polyvinylidene fluoride (PVDF) polymer were prepared by an electrospinning method. BNT-ST/PVDF nanofiber sensor modules were prepared by a WIP (Warm Isotropic Press) process, and then the lead-free piezoelectric nanofiber modules were poled at 1 kv at room temperature for 1 h. The XRD patterns of the lead-free piezoelectric nanofiber sensor modules showed the phase transition by the poling process. A higher temperature of ferroelectric-to-relaxor transition temperature was observed in the poled lead-free piezoelectric nanofiber sensor modules. The poled and unpoled lead-free piezoelectric nanofiber sensor modules were directly attached on the structure with various shapes, and the characteristics of a flexible structural health monitoring sensor application were measured by simulating several situations. The sensing sensitivity for various situations was increased by the poling process, and the accuracy of the sensing result was improved. G3-18 Evaluation of Dynamic Elastic Modulus and Poisson''s ratio according to Zirconia Molding Shrinkage using IET Method IET(Impulse Excitation Technique) 법을이용한지르코니아성형수축률에따른동탄성계수및푸아송비측정평가정대웅 1*, 조인식 2, 윤혜림 1, 김희준 1, 이창순 1. 1 선문대학교, 2 ( 주 ) 엠브로지아세라믹제품은일반적으로소결후가공이어렵기때문에완전소결전예비소결을통해수축률을계산하여가공을하게된다. 이때, 수축률이항상일정하게나오는것이아니라어느정도변화가있으며, 이는제품의정밀도와도크게연관되어진다. 이러한제품중덴탈용지르코니아는최종열처리시수축률인 18~20% 를고려하여치아모델보다크게가공한다. 이를최종열처리후치수를확인하고마무리연삭작업을끝낸다. 이와함께소재의중요한물성값중하나가탄성계수와푸아송비로써기존의정적인측정방법으로는시험준비가정밀성을요할뿐아니라파괴방법이며, 해석또한부정확하여어려움이있는실정이다. 하지만최근비파괴방법이면서시험도단순할뿐아니라정확한결과의재현성이확보되어있는동탄성계수측정방법중하나인 IET(Impulse Excitation Technique) 법이있다. 따라서본연구에서는예비소결된지르코니아수축률과소재의물리적성질인탄성계수, 푸아송비와의상관성을평가분석하기위한연구내용으로 IET(Impulse Excitation Technique) 법을이용하여각수축률 ( 약 18.5 ~ 21.4%) 에따른지르코니아의탄성계수와푸아송비를측정하고자하였다. S31-1 Porous Ceramics from Particle Stabilized Colloidal Suspension 입자가안정화된콜로이드현탁액으로부터다공체세라믹스제조 Ik Jin Kim *. Hanseo University The unique chemical composition and microstructure of porous ceramics enable the ceramic products used in number of applications such as filtration of molten metals and hot corrosive gases, hightemperature thermal insulation, support for catalytic reactions, filtration of diesel engine exhaust gases etc. These applications take advantage of special characteristics of porous ceramics such as low thermal mass, low thermal conductivity, controlled permeability, high surface area, low density, high specific strength. In this chapter, we emphasize on direct foaming method, a simple and versatile approach that allows fabrication of various porous ceramics, Al 2 O 3, Al 2 O 3 /SiO 2, Al 2 TiO 5 /ZrTiO 4, Al 2 TiO 5 /Mullite, SiC etc. with tailored microstructure along with distinctive properties. Foam stability is achieved upon controlled addition of amphiphiles to the colloidal suspension which induce in-situ hydrophobization, allowing the wet foam to resist coarsening upon drying and sintering. S31-2 Inorganic Membranes for Separations in Liquid, Vaporous and Gaseous Media M. Weyd *, J. Richter, R. Kriegel, N. Reger-Wagner, Ch. Pflieger, H. Richter, I. Voigt. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Hermsdorf (Germany) Inorganic membranes are of many advantages regarding stability 98 한국세라믹학회

119 구두발표 (chemical, mechanical, thermal) and flux in comparison to polymeric ones. An increasing number of separation tasks in the fields of environmental protection, chemical industry and energy technology can be solved by the help of these membranes. In liquid filtration e.g. porous ceramic membranes with enlarged specific membrane area and developed by Fraunhofer IKTS are used for treatment of diverse process waters and produced water from oil production [1], porous and nonporous membranes are being developed for gas separation processes and hydrophobic membranes are being developed for membrane distillation and membrane extraction. For more than one decade inorganic zeolite membranes are used for dewatering processes by pervaporation or vapor permeation, especially focusing on breaking azeotropic compositions. The presentation will give an overview of membrane geometries, materials of active membrane layer (such as ceramics, zeolite, carbon) and membrane applications that are in development at IKTS. [1] A. Nijmeijer: The use of inorganic membranes in oil and gas industry, 13th ICIM, 6-9 July 2014, Brisbane, Australia S31-3 Ceramic Membrane Applications and their Performance Evaluation in Biogas Production Process during Co-management of Domestic and Food Wastewater 도시하수및음폐수혼합처리로부터바이오메탄가스생산기술에서의수처리용세라믹멤브레인적용및성능평가 Chanhyuk Park *. Korea Institute of Science and Technology Activated sludge process have made significant contribution to wastewater treatment in the past. However, high energy consumption with aeration impacts on the current wastewater industry worldwide and associated with the issue of global climate change. The solutions forward should rely on the ways to improve energy recovery as well as minimizing in-plant energy consumption. In this study, a bench-scale anaerobic ceramic membrane bioreactor (AnCMBR) was operated to co-manage the simulated domestic wastewater and actual food waste recycling wastewater (FRW). Coupling ceramic membrane filtration with anaerobic membrane bioreactor treatment provides an alternative strategy for high organic wastewater treatment at short hydraulic retention times (HRTs) with the potential benefits of membrane fouling because they have a high hydrophilicity and more robust at extreme conditions. A high organic removal was achieved during the AnCMBR treatment at a high organic loading rate (OLR) of 2.95 kg COD m -3-1 caused by the FRW addition corresponding to an average methane production of 0.21 L CH 4 /g COD removed. Implementing AnCMBR might be more feasible in direct COD capture without production of much excessive sludge, extremely low energy consumption and high-efficiency biogas production. However, a highly treated effluent rich in nutrients should be recovered at a downstream treatment for concurrent energy and resources recovery from the domestic wastewater. S31-4 Development of Water Purifier with Ceramic Filter Made by Natural Raw Materials 천연원료를이용한세라믹필터적용정수기개발 Kwang Taek Hwang *, Jongchan Lee, Jinho Kim, Kyusung Han, Woo Seok Cho. Korea Institute of Ceramic Engineering and Technology 지구온난화와인구증가로세계각국에서물부족문제가심각해지고있다. 특히저개발국은상수도보급률이낮아지표수를음용수로활용하고있어수인성질병으로고통받는인구가많다. 우리나라의경우는높은상수도보급에의해수돗물을식수로사용할수있을만큼좋은수질환경을가지고있으며, 각가정마다정수기를사용하는경우가증가하고있다. 그러나저개발국가의경우정수기와같은장치는설치및유지가격이높고, 전력부족으로인해사용이어려운현실이다. 전통도자인옹기는모래를많이함유하고있는황토를이용하여성형하고유약을발라 1200 o C 이하에서한번의소결로제작된다. 옹기는초기원료의입도분포가넓고소결온도가낮아기체나액체가투과할정도의기공이형성되어 숨쉬는그릇 으로알려져있다. 이들기공을제어하면물이투과할수있는필터로사용할수있는가능성이있다. 본연구에서는캄보디아의천연원료를출발원료로자체제작한수동성형기를이용하여옹기필터를제조하였다. 건조된필터는가스가마에서 1100 o C, 1시간소성하였다. 제조된필터를무전원정수장치에장착하여정수기로써의투과도와여과성능을평가하여옹기가필터로서의기능에적합함을확인하고자하였다. 개발된기술은캄보디아에기술이전하여현지인들이직접필터를제조할수있도록하여적정기술 (Appropriate technology) 로서영속성을확보하고자하였다. S31-5 Organic/Inorganic Surface Modification Techniques for Ceramic Membranes for Water Treatment 수처리용세라믹분리막의기능성향상을위한유 / 무기표면개질기술연구 Jongman Lee *, Jang-Hoon Ha, In-Hyuck Song. Korea Institute of Materials Science The pristine alumina membranes are usually susceptible to membrane fouling during water purification process. It is attributed mostly to the positively charged surface properties, which resulted from relatively high isoelectric point (IEP) of 9.4. For improving the fouling resistance of alumina membranes, we endeavored to control the surface properties using two different methods: organic and inorganic surface modifications. For the organic modification, three representative organosilanes presenting neutral (-CH 3 ), positive (-NH 2 ), and negative (-SO 3 ) charges were allowed to graft onto alumina membranes. In the membrane filtration test using humic acid, the neutral and negatively charged membranes maintained higher flux patterns. Notably, the negatively charged membranes achieved the most remarkable flux behavior during entire fouling procedure. This result is primarily ascribed to the electrostatic repulsion force between the organosilanegrafted membranes and negatively charged humic acid (IEP: 4.7). For the inorganic modification, the alumina membranes were modified using a SiO 2 sol-gel process to mitigate membrane fouling. Due to low isoelectric points, SiO 2 -coated membranes have a strong negative surface charge (130 mv at ph 6.5), which results in the electrostatic repulsion forces against humic acid. The membranes with higher TEOS concentrations exhibited higher flux levels during membrane fouling procedures. 한국세라믹학회 99

120 2017 년한국세라믹학회추계연구발표회 S31-6 Optimization of Cost-effective SiC Based Membrane for Microfiltration Applications MF 필터용저가의탄화규소계세라믹분리막의최적화 In-Hyuck Song *, Bukhari Syed Zaighum Abbas, Jang-Hoon Ha, Jongman Lee. Korea Institute of Materials Science Ceramic membranes can be applied under extreme operating conditions such as low ph, high pressure and high temperature. Especially, the inherent limitations of conventional polymer membranes can be overcome by adopting ceramic membranes simply to the existing water treatment systems. Moreover, there are a lot of potential applications of ceramic membranes such as distillation, adsorption and extraction in various industrial areas. Therefore, the ceramic membrane technology is not a mere ceramic processing technology, but a highly influential technology to the overall environment technology. In particular SiC has excellent mechanical properties and also has excellent properties related to membrane performance. However, high processing temperature increases cost of SiC products and thus limit s its use. In this study oxidation bonding technique was used to fabricate cost-effective SiC microfiltration membrane at low temperature. The oxidation behavior at different thermal treatments was related with pore morphology and ultimately the membrane permeability. We have found that the membrane made by coating of oxidation bonded SiC layer over clay-bonded SiC support, sintered at o C could make a defect-free microfiltration membrane with pure water permeability above 700 LMH per bar. The membrane has narrow pore size distribution with average pore size about 0.1 μm. S31-7 A Study on the Low-cost Porous Ceramic Membranes for Microfiltration 정밀여과를위한저가다공성세라믹분리막에관한연구 Jang-Hoon Ha *, Sujin Lee, Jongman Lee, In-Hyuck Song. Korea Institute of Materials Science Recently porous ceramic membranes have become a subject of special interest due to their outstanding thermal and chemical stability. To alleviate the manufacturing cost issues of porous ceramic membranes, recent research is focused on the utilization of low cost natural materials. In this study, we introduced porous ceramic membranes prepared from diatomite, kaolin, and pyrophyllite which are low-cost natural materials. And we report the results of our efforts to determine whether we could prepare a low-cost ceramic support layer that could control the average pore size, the largest pore size, the flexural strength and the air/water permeability effectively. The pore characteristics of the specimens were studied by scanning electron micrography, mercury porosimetry, capillary flow porosimetry, and a dead-end microfiltration system with particle counters. S31-8 Template-free Synthesis and Applications of Porous Silica Particles Using Sodium Silicate as Precursor 물유리등저가원료를활용한다공질실리카분말의무주형합성및응용기술 Young-Sang Cho *. Korea Polytechnic University 본학술발표에서는다공질실리카입자의합성을수행하기위하여물유리 (sodium silicate) 등저가원료를활용하는방법에대한연구결과를소개하고자한다. 기존에 TEOS를전구체로활용하여 졸 - 겔반응을적용하여실리카분말을합성하는방법은반응속도제어의측면에서용이하므로실험실수준에서의연구에광범위하게활용되어왔으며, 이미 1960 녀대에구형실리카분말을합성하기위한 Stober 방식이개발된바있다. 하지만전구체물질로활용되는 TEOS 등의유기금속화합물은단가가비싼편이므로산업적인용도로활용하기에는어려운측면이있다. 따라서보다저렴한원료인물유리를활용하여실리카분말을합성하는방법을개발할필요성이있으며, 본연구에서는다공체형태의실리카분말을합성하고자하였다. 이온교환수지를통해물유리로부터나트륨이온을제거하였으며, 이러한정제결과얻어진 silicic acid 를수중유액적에주입하여액적의증발에의한자기조립을거쳐다공질실리카분말을합성할수있었다. 여기에는기공형성을위한주형물질이불필요하므로, 주형물질의제거단계가요구되지않는다는장점을기대할수있다. 따라서다공질분말의합성에요구되는공정이보다용이한합성기술로확립되었다. 본연구에서는다공질실리카분말의합성및입도제어, 다공체내에기능성나노입자의도입및초발수코팅과광촉매응용기술등에대하여소개하고자한다. 본연구는산업통상자원부산업기술혁신사업의연구비지원 ( 과제번호 : ) 에의해수행되었으며, 이에감사드립니다. S31-9 Fabrication of Porous SiC by Mullite Formation through the Oxidation of Ti 3 AlC 2 and SiC Ti 3 AlC 2 와 SiC의산화를통한 Mullite 형성에의한다공성 SiC의제조 Arifin Septiadi *, Dang-Hyok Yoon. Yeungnam University Fabrication of porous SiC by oxidation-bonding technique was realized by the formation of mullite from the reaction between oxides generated from the oxidation of SiC and Ti 3 AlC 2. Utilization of Ti 3 AlC 2 increases the strength of mullite-bonded porous SiC more than 22% compared to that using Al 2 O 3. The optimization was performed in terms of Ti 3 AlC 2 pre-heat treatment, ceramic powder ratio, binder content, and heat-treatment conditions. The pellets prepared by 10 MPa followed by heat-treatment at 1200 o C-1400 o C in air for 3 h revealed 60% density, suggesting adequate porosity for water filtering application. Subsequently, the optimized powder system was added with 40 wt.% water with respect to the powder mixture and fabricated to hollow tube membrane by extrusion. The extruded bodies were dried at room temperature for 12 h followed by heat-treated at C for 3 h. The membranes were evaluated using diametral compression test, microstructure analysis, mercury intrusion porosimetry, and corrosion test at ph = 3 and 11. The detailed properties will be presented. S31-10 Study of Optimized SiC Particle Size Distribution for Dense Packing 최밀충전 SiC 성형체제작을위한최적입도연구 Young-Seok Jung 1*, Kyoon Choi 1, 윤호규 2, Seiki Kim 1. 1 Korea Institute of Ceramic Engineering and Technology, 2 Korea University 탄화규소는내마모성, 내침식성이우수하고, 열팽창계수가낮으며고온강도또한우수하다. 하지만강한공유결합으로인해난소결성을가져이론밀도에도달하기어렵다. 이런문제점을해결하기위해여러가지입도를갖는 SiC 성형체에액상 Si를침윤하여 Si- SiC를제조하는 RBSC 공정이많이응용되고있다. RBSC는기계적, 열적물성외에도공정상소결수축이없고, 저렴한공정비용 100 한국세라믹학회

121 구두발표 으로인해고온열교환기, 가스터빈및반도체용열처리반응로에많이응용되고있다. 하지만입자크기와잔류실리콘의영향으로낮은파괴강도및신뢰도문제가제기되며고온강도가낮아져사용온도가제한되는단점이있다. 본연구에서는 Soddy Circle 과 Furunas Model 을적용한 SiC 분말을이용해잔류실리콘양을최소화하며, 소결조제를첨가하지않고최밀충전된 SiC 성형및소결체를제작하였다. Soddy Cicle 로계산된 SiC 분말 3 가지조성과 SiC 분말무게의페놀수지 5 wt% 를유발로혼합한후일축가압성형을진행하였다. 성형압력은 1000 kgf/cm 2 이며, 진공데시케이터에서 1 mbar, 80 o C 에서 2 시간, 150 o C 에서 30 분이상경화처리하였다. SiC 성형체및소결체밀도는 2 가지모델이적용된시료에서최밀충전되었음을확인하였다. Normal-SEM Back-Scattering Mode 를이용해각조성의 SiC 분말분산정도를분석하였다. 아르키메데스방법을이용해기공률을계산하였으며, XRD 검량선을통해최밀충전된구조의잔류실리콘의양을분석하였다. S32-1 Fabrication of SiC f /SiC-ZrB 2 Composites by Electrophoretic Deposition and Liquid Silicon Infiltration Hybrid Route 전기영동증착및액체실리콘침투하이브리드경로에의한 SiCf / SiC-ZrB 2 복합재료의제조 Wahid Muhamad FR *, 김명동, Amit Siddharth Sharma, 윤당혁. 영남대학교 An effort has been made for the fabrication of SiC-ZrB 2 composites for ultra-high temperature ceramics applications by incorporating the SiC fiber into this composite to enhance the mechanical properties. The fabrication of SiC f /SiC-ZrB 2 composites used in this study can be divided into 3 stages; 1)the formation of pyrolytic carbon (PyC) on SiC fiber, 2) the infiltration of SiC, ZrB 2, and carbon black nanoparticles into SiC fiber by alternating current electrophoretic deposition (AC-EPD), and 3) the densification process by liquid silicon infiltration (LSI). The PyC-coated SiC fabric was prepared by infiltrating the phenolic resin suspension into the Tyranno TM -SA3 SiC preform by vacuum infiltration followed by pyrolysis at 1700 o C for 4h. A well-dispersed slurry containing SiC, ZrB 2, and carbon black particles in deionized water with a suitable aqueous dispersant and binder at optimum ph was effectively infiltrated into PyC-coated SiC fabrics by AC-EPD. Afterward, 15 layers of infiltrated fabrics were laminated uniaxially under a pressure of 10 MPa at 1300 o C in an Ar atmosphere. Liquid silicon infiltration was carried out with the use of Si granules at 1550 o C for 3 h in an Ar atmosphere. By using SiC fiber as an infiltrated medium for LSI, Smelt was infiltrated successfully into the laminated SiC f /SiC-ZrB 2 -C composites. The densities, microstructure, and mechanical properties as a function the various processing parameters of SiC f /SiC-xZrB 2 (x = 5 and 40 vol.%) composites will be presented in detail. S32-2 Fabrication of Cf-BN-SiC Composite Using Polymer Infiltration Pyrolysis 고분자함침열분해법 (PIP) 을이용한 Cf-BN-SiC 복합체제조구준모 *, 김경호, 최균, 이성민, 한윤수. 한국세라믹기술원 Cf-BN-SiC(Carbon fiber boron nitride-silicon carbide) 복합체는항공우주용차세대소재로개발된세라믹기반복합체 CMCs(Ceramic Matrix Composites) 로써, 경량성, 내크립특성, 방열특성, 내산화성등의우수한특성으로항공부품, 엔진, 내방사선구조물등최근사용영역이확장중인유망소재이다. 섬유상과기지상의계면 은탄소섬유복합체의파괴인성에큰영향을주므로, 이를제어하기위해다양한중간층의연구가이뤄지고있다. 이중계면결합력이약한 BN 중간층은미끄러짐성이우수하여균열전파에의한섬유상의파괴를억제하고, 또한산화를방지하여탄소섬유를보호하는역할을한다. 최근고품질 CMC 제조를위해 BN 중간층과 SiC 기지상은 CVD/CVI 와같은기상증착법을이용하나, 기상증착법의경우시일이오래걸리고, 공정이복잡하며, 비용이높은단점이있다. 반면, 습식코팅법은기상증착법에비해품질은저하되나, 공정이간단하고비용이낮은장점으로최근주목을받고있다. 본연구에서는습식코팅을이용한 Cf-BN-SiC 복합체를제조하였다. 붕산 (boric acid) 과요소 (urea) 를전구체로하여 2.5D 의탄소프리폼에습식코팅하였다. 전구체의조성과농도에따른중간층의두께변화를확인하고, 질화처리조건이 BN 형성에미치는영향을확인하였다. SiC 기지상은일반적인 PIP 공정을따라, 상용 PCS(polycarbosilane) 를반복적으로프리폼에침투시켜치밀화하였다. 침투횟수에따른 SiC 의밀도변화를단면이미지분석을통해확인하였다. 상기의방법을통해제조된 Cf-BN-SiC 복합체시편은만능시험기 (MTS) 를이용하여기계적물성을측정하였다. S32-3 Development of SiCf /SiC Composite for Gas Turbine Components 가스터빈용 SiC f /SiC 복합체개발박지연 1*, 김대종 1, 우상국 2, 김세영 2, 이세훈 3, 윤당혁 4, 신인철 5, 임광현 5, 문흥수 6, 김지유 6, 곽찬원 6. 1 한국원자력연구원, 2 한국에너지기술연구원, 3 재료연구소, 4 영남대학교, 5 대양산업, 6 ( 주 ) 세원하드페이싱 SiC f /SiC 복합체는비산화물계섬유강화복합체로높은열전도도, 우수한내식성및내마모성, 낮은열팽창율과경량으로인하여항공우주용부품, 가스터빈엔진부품, 열병합발전용가스터빈부품, 열교환기및원자력산업의가스냉각형원자로의노심구조재료와핵융합로블랭킷구조재료등으로응용하기위해연구개발이진행되고있다. 본논문에서는지난 5년간산학연컨소시엄에서가스터빈연소기라이너적용을목표로진행되었던 SiC f /SiC 복합체소재개발에대하여요약하여소개하고자한다. 제조공정으로화학기상침착공정 (Chemical Vapor Infiltration, CVI), 전기영동법 (Electrophoretic Deposition : EPD) 에의한슬러리함침 (Slurry impregnation) 및고온가압 (Hot Press) 공정, 액상금속함침및반응소결공정 (Liquid Metal Infiltration, LMI) 과고분자함침열분해공정 (Polymer Impregnation / Pyrolysis : PIP) 이직경 150 mm ~ 400 mm인라이너형상을만들기위하여개발되었고, 튜브형상의프리폼을만들기위하여 filament winding과 braiding 방법을최적화시켰다 o C 이상의고온극한환경을고려하여내환경코팅 (Environment Barrier Coating) 을위한분말합성과용사코팅기술을개발하였다. 또한복합체의물성평가를위하여인장, 굽힘, C-ring 강도및파괴인성을 ASTM을기반으로한평가절차를따라수행하였고, 성능평가를위하여열충격, 열피로및내삭마시험기술도확보하고성능시험을수행하였다. 이결과들을간략하게요약하고향후연구개발에대한방향을논하고자한다. S32-4 Melt Infiltrated SiC/SiC Composites Development 용융침투공정을적용한 SiC/SiC 복합소재개발우상국 1*, 한인섭 1, 김세영 1, 김수현 1, 성영훈 1, 송종섭 2. 1 한국에너지기술연구원, 2 충남대학교탄화규소섬유강화탄화규소복합소재 (SiC/SiC) 는내열성및기계적강도가우수하여최근가스터빈부품등에다양하게적용되고있 한국세라믹학회 101

122 2017 년한국세라믹학회추계연구발표회 다. 복합소재제조방법중용융침투공정법 (Melt Infiltration-MI) 은낮은제조단가및짧은공정시간등의장점을가져현재상용부품들의제조법으로사용되고있다. 본연구에서는고분자함침 MI 와세라믹슬러리함침 MI, 두공정에대한제조법을비교하였다. 또한, MI 공정에 SiC 섬유를적용하기위해결정화도와산소함량이다른세가지 SiC 섬유 (Tyranno SA, LoxM, Tyranno S) 를이용하여 SiC/SiC 복합재료를제작하고그적용가능성을확인하였다. S32-5 Effect of SiC Filler for the Fabrication of SiC f /SiC CMC by PIP Process 전구체함침법으로제조된 SiC f /SiC 복합재료에서 SiC계필러의효과이세훈 *, 김준섭, 자오린, 배창준. 재료연구소 TyranSA3 SiC or T-300 carbon fiber woven fabrics with PyC coating were used for the fabrication of the SiC f /SiC or C f /Si(B)CN ceramic matrix composites (CMC) by precursor impregnation and pyrolysis (PIP) method. The SiC f /SiC CMCs suffered from strong deterioration at 1500 o C. For gaining a deeper understanding of the strength degradation of the CMC at high temperature, the high temperature thermal behavior as well as the corresponding phase characterization of the PCS or polycarbosilazane (PCSZ) precursor after pyrolysis was analyzed. Although a major mass loss was completed before 1400 o C, a further mass loss in the temperature range of 1400 o C to 1500 o C was still detected. The oxygen which was contained in the PCS mainly caused the deterioration of properties at 1500 o C. The dispersion and infiltration of oxide or non-oxide fillers in the 2D-woven fiber fabrics were performed in order to get over the high temperature deterioration of the matrix phase. Among the four filler materials, SiC was proved to be the most appropriate filler materials in terms of mechanical properties and thermal stability. However, SiO 2 layer which was formed on the surface of SiC filler strongly deteriorated the high temperature properties of the CMC. The problem could be solved by removing the oxide layer before the beginning of PIP cycle. By the optimization of the filler and precursor-derived ceramic matrix, the high temperature strength of the CMC could be improved at and above 1500 o C. S32-6 Properties of Radiation-resistant SiCf/SiC Composites Prepared by Chemical Vapor Infiltration 화학기상침착법으로제조된조사저항성 SiC f /SiC 복합체의특성김대종 *, 이승호, 이현근, 박지연, 김원주. 한국원자력연구원원자력노심용구조재료는중성자및냉각재환경에장시간노출이되기때문에, 가동환경에서높은기계구조적건전성, 물리 / 화학적안정성이매우뛰어나야하며, 높은중성자이용효율을얻기위해서중성자를흡수하는특성이낮아야한다. 최근들어서는원자력의안전성이더욱강조가되고있으며, 사고환경에서도시스템의건전성이유지되어방사선누출을최소화할수있는다양한시스템들이개발되고있다. 이를달성하기위해서는기존의구조재료보다월등히뛰어난고신뢰성노심소재개발이필요하다. SiC f /SiC 복합체를원자력시스템에적용하기위해서는제조기술및비용, 접합, 장기부식등의제약이있지만, 기존에사용되던금속소재에비해초고온에서의기계적강도과부식저항성이월등히뛰어나기때문에개발성공시원자력시스템의안전성을획기적으로향상시킬수있다. 본연구에서는중성자조사환경에서우수한저항성을가지는고밀도화학기상침착 (CVI) SiC f /SiC 복합체 를제조하였으며, 노심환경에서발생할수있는열화거동을모사하여평가하였다. S32-7 Fabrication of SiC f /SiC Composites Using Different Sintering Additives and Comparison of their Proton Irradiation Damages 소결조제를다르게하여제작한탄화규소섬유강화탄화규소복합체의양성자조사영향윤당혁 1*, Pipit 1, Amit Siddharth Sharma 1, 박지연 2. 1 영남대학교, 2 한국원자력연구원 To fabricate the SiC f /SiC composites containing 2 different sintering additives of Sc-nitrate and Al 2 O 3 -Y 2 O 3, vacuum infiltration and DCelectrophoretic deposition were used, respectively, for the efficient infiltration of matrix phases into the 3D-woven Tyranno SA3 SiC preform. Hot pressing at 1750 C, 20 MPa for 2 hour yielded the composite density close to 95% ρ theo. The proton irradiations to the fabricated SiC f /SiC were performed to the fluence level of p + /m 2 (E > 14 MeV) at Korea Multpurpose Accelerator Complex (KOMAC) to evaluate the microstructural changes and irradiation-induced damages. Cross-sectional SEM and HRTEM combined with FIB were employed to probe the crack formation, pore generation and surface amorphization upon proton irradiation. Matrix phase was comparatively more crack-resistant in the SiC f /SiC with Sc-nitrate than that with Al 2 O 3 -Y 2 O 3. Subsurfacial porosity evolved in the form of continuous bands and discrete pockets in Al 2 O 3 -Y 2 O 3 and Sc-nitrate cases, respectively. Selective leaching of Si from the grain surface leads to the formation of graded structure and surface amorphization. Irradiation-induced roughness on the fibers facilitates easy debonding at the SiC f -PyC coating interface though any significant changes in flexural behavior were not observed. S32-8 Effect of SiC Whisker Growth on Microstructure and Mechanical Properties of SiC f /SiC Composites Prepared by Chemical Vapor Infiltration Method CVI법으로제조한 SiC f /SiC 복합체에서 SiC whisker 성장이미세구조및기계적성질에미치는영향이호욱 1*, 김대종 1, 이현근 1, 김원주 1, 윤순길 2, 박지연 1. 1 한국원자력연구원, 2 충남대학교 SiC는열적기계적안정성으로인해극한환경에서도사용할수있다. 하지만 monolith SiC의경우취성파괴거동을갖기때에 SiC f / SiC 복합체제조를통해취성파괴를개선할수있는고온구조용재료로사용하려는연구가진행되고있다. SiC f /SiC 복합체를제조하는데다양한방법들이있다. 그중화학기상침착법은다른공정에비해상대적으로낮은온도에서복합체를제조하기때문에섬유의손상을최소화하고낮은잔류응력및열팽창계수를갖는장점을갖는다. 하지만화학기상침착법을이용해복합체를제조할때농도구배로인해섬유사이사이로반응기체가더이상확산해들어가지못해기지상을채워넣고난뒤에도내부에기공을남긴채로반응이끝나게된다. 이로인해밀도저하를가져오는단점이발생한다. 또한 inter-laminar를통해균열전파가쉽고 interfacial shear strength가약하며긴공정시간을갖는단점이있다. 이를보완하고자본연구에서는직조된섬유사이사이의빈공간에기지상을채우기전에 SiC whisker를성장시켜기공율을낮추고이를침착의새로운 site로이용해침착이더빠르게진행되어공정시간을단축시키고자하였다. 온도, 압력변화를변수로 whisker를성장 102 한국세라믹학회

123 구두발표 시켰고이를통해각시편의밀도변화와미세구조관찰을통해최적의 whisker 성장조건을찾기위한연구를진행하였다. 또한 Whisker 를성장시킨후화학기상침착법을이용해복합체를제조하여일반적인 CVI 법으로제조한 SiC f /SiC 복합체와의비교를통해 whisker 가복합체에미치는영향에대해연구하였다. SEM image 와 XRD 를관찰하였고기계적강도평가시험을통해각각미세구조와기계적성질을알아보고자하였다. S32-9 Continuous Manufacturing Process of Silicon Carbide Fiber for Pilot-Scale Production 파일롯 -규모생산을위한실리콘카바이드섬유의연속제조공정윤병일 *, 최우철, 김재성, 강홍구, 김명주, 김정일. ( 주 ) 데크카본 ( 주 ) 데크카본은 Yajima 교수가개발한공정을기반으로하여 1차적으로파일롯- 규모로탄화규소섬유를생산하기위한공정기술과생산시설을구축하고있다. 탄화규소섬유는탄소섬유와달리생산기술이나제조시설측면에서는거의공개기되지않고있다. 본발표에서는파일롯-규모로연속적으로탄화규소섬유를제조하는기술현황을소개하고자한다. 탄화규소섬유생산에있어서가장중요한기술은먼저섬유용의폴리카보실란 (PCS) 전구체인프리세라믹고분자의합성이다. 분자량분포도, 연화점 180~230도, 그리고정제기술이중요하다. PCS의방사는대단히어려운기술의하나로서, PCS 를용융하여방사시절사없이 100% 노즐을통한섬유의토출기술은 Fine한직경의섬유제조와보푸러기가없는균일한제품제조에중요하다. PCS섬유방사후에섬유의불융화를위한경화공정, 제품의균일하고적절한경화도, 그리고결함발생과절사가능성, 강도저하원인제거를사전에조치하는공정기술이요구된다. 고온열처리를위한장치의설계는균일하고높은강도를얻는데핵심기술이다. 또한처리할섬유번들의필라멘트가균일한열을받고분해하고, 발생가스의제거, 균일한장력을유지가이루어질수있는필라멘트수가중요하다. 본공정에서얻어지는탄화규소섬유서 SiCxOy 구조의섬유로서고온에서기계적물성의큰저하없이장기간사용이어렵다. 따라서산소량을 4 wt% 까지감소하기위한중상급수준의탄화규소섬유제조를위하여 CVC 공정을개발하고있다. ( 주 ) 데크카본은앞으로산소량이 0.5 wt% 이하의탄화규소섬유개발을추진과, 기존탄화규소섬유를개질하여특수용도로국방분야로의적용연구결과를소개하고자한다. S32-10 Commercialization Technologies of Amorphous SiC Fiber Using Preceramic Polymer Preceramic Polymer 를활용한비정질 SiC 섬유의상용화기술조광연 *, 신동근, 이윤주, 허서. 한국세라믹기술원탄화규소 (SiC) 는고온안정성이뛰어나고반도체특성을가지고있어다양한고기능성을가진소재다. 섬유형상을갖게되면고온안정성과복합재보강재로도사용되어초고온구조재로서독보적인물성을나타낸다. SiC 섬유의고기능성은우주항공, 원자력, 스텔스, 반도체분야의제조용치공구에응용되는등활용범위가광범위하다. SiC 섬유의제조공정은세라믹전구체고분자 (preceramic polymer) 를활용하여용융방사하여원사섬유를제조하는공정이일반적이다. 세부적으로보면원사섬유의균일방사와집속기술로구분되며이로부터얻어진원사섬유의물성이후공정및최종 SiC 섬유의물성에중요한영향을미친다. 제조된원사섬유는열처리과정에서다시녹지않도록안정화 (curing) 처리를거친후 1200 o C 이상으로열처리하여열분해및세라믹으로전환시켜비정질 SiC 섬유를제조한다. 또한 1800 o C 이상에서추가열처리 ( 소결 ) 를통해비정질 SiC 섬유가완전결정화 SiC섬유로전환되는데, 이때소결치밀화를유도하기위해 Al, B 등소량의소결조제가도핑된폴리카보실란을출발원료로사용한다. 따라서 2000 o C 이상의초고온에서소결 / 치밀화및다양한기능성을부여하기위해다양한원소등이도핑된폴리카보실란의합성기술이중요하다. 그러므로 SiC 섬유의상용화기술개발을위해서는 SiC 장섬유기술과세라믹전구체원료 (PCS) 합성기술이동시에확보되어야한다. 이에현재진행중인 Preceramic Polymer 를활용한비정질 SiC 섬유의상용화기술 을장섬유제조공정과원료제조공정으로설명하고상용화를뒷받침하기위한비정질 SiC 섬유의용도에대해기술하고자한다. 또한, SiC 섬유의연속생산을위한개별공정별이슈들을논의하고자한다. S32-11 Pyrolysis and Crystal Formation Behavior of Polycarbosilane Complex-doped with Al and Hf Al과 Hf이복합도핑된폴리카보실란 (Polycarbosilane) 의열분해및결정형성거동이현명 *, 이윤주, 배성군, 조광연, 권우택, 김영희, 신동근. 한국세라믹기술원폴리카보실란 (Polycarbosilane) 은 SiC의 Precursor로알려진무기계고분자로, 고품질의 SiC 섬유생산과복합체제조를위해서는폴리카보실란의분자량, 고온유동성, 열분해수율, 열안정성등이중요한인자로제어되어야한다. 열분해과정을거쳐형성되는 SiC 의품질은공정과정에서유입되는산소의제어에의해서결정되기도한다. 화학양론적으로폴리카보실란은탄소의양이실리콘에비하여높은편으로, 주로 1200 o C o C에서가스상태의 CO 로분해되어잉여의탄소가제거되는데, 동시에다공화또는잉여의산소가 SiO를형성하기도하여 SiC 성형체의물성을크게저하시킬수있다. 뿐만아니라, SiC의고온 / 고강도특성을나타내기위해서는 SiC의소결을유도 / 향상하여야하므로소결조제를필요로하며, 다양한금속원소를도핑하여기능성을부여할수있다. 본연구에서는, Yajima method를이용하여폴리카보실란을합성하되, Al과 Hf 금속을도핑하고, 이의열분해거동을확인하고자하였다. 먼저, 제조된 Al, Hf-PCS에대해분자량, 유동성, 열분석등고분자로서의물성을확인하고, 분말상태의 Al, Hf-PCS를 200 o C에서산화한후, 1800 o C에서열처리하였다. 폴리카보실란은열분해과정을거치면서 1400 o C 이상에서 SiC 결정으로전환되는데, 이때도핑된금속에의해형성된이종상과이들금속이 SiC 결정의성장에미치는현상을 SEM, XRD, TEM을이용하여평가하였다. S32-12 The Change of Cracking and Mechanical Behavior of Environmental Barrier Coatings Subjected to Thermal Durability Test 내환경코팅재의열내구성평가에의한균열및기계적거동변화이기성 1*, 채연화 2, 서형일 1, 문흥수 3, 우상국 4, 박지연 5. 1 국민대학교, 2 국민대학원, 3 ( 주 ) 세원하드페이싱, 4 한국에너지기술연구원, 5 한국원자력연구원미국을중심으로항공기엔진에세라믹스섬유강화복합재의적용에대한현실화가이루어지고있는추세에있어서, 복합재의개발과더불어내환경코팅재의개발역시중요해지고있다. 이는실리콘 (Si) 기반의탄화규소 (SiC) 섬유강화복합재가항공기터빈에사용될경우고온에서수증기와의반응으로질량손실에의한손상이발생하므로이를방지하기위하여열환경 (EBC) 코팅이필요하기때문이다. 본연구에서는 Mullite, Yb 2 SiO 5, Y 2 SiO 5 단층코팅과함께 Mullite+Yb 2 SiO 5 등의복합재, 열환경 / 차폐 (E/TBC) 이 한국세라믹학회 103

124 2017 년한국세라믹학회추계연구발표회 층상코팅재등다양한분말을플라즈마용사시분무거리를다르게하여코팅재를제조한후 1200 o C 및 1350 o C 의고온에반복노출하여열싸이클링및열충격시험을수행하였다. 또한열싸이클링시험및열충격시험전후압입시험법을이용하여기계적거동변화를살펴보았다. 열싸이클링및열충격시험후내환경코팅재에균열이발생하였으나, 이러한균열은안정적인거동을나타내어균열의성장에의한계면박리가일어나지않았고, 고온의노출에의해일부는 crack healing 이관찰되었다. S32-13 Ablation Behaviors of Thermal/Environmetal Barrier Coated SiC based Ceramics in Air T/EB 코팅된 SiC 계세라믹스의공기중삭마거동박지연 1*, 김대종 1, 이현근 1, 김원주 1, 임병주 2, 신인철 2, 김지유 3, 문흥수 3, 윤당혁 4, 이기성 5. 1 한국원자력연구원, 2 대양산업, 3 ( 주 ) 세원하드페이싱, 4 영남대학교, 5 국민대학교 SiC 계세라믹스를 1500 o C 이상의고온소재로사용하려면공기나고온수증기에의한산화로인하여특성열화가발생한다. 이를방지하기위하여내환경코팅을하여내구성을증진시킨다. 본연구에서는 CVD SiC와 SiC f /SiC 복합체에내열 / 환경코팅 (thermal/ environmental barrier coating) 을수행하고삭마시험을수행하여열화거동을살펴보고자하였다. CVD SiC는상용제품을사용하였고, SiC f /SiC 복합체는 TyrannSA3 섬유로평직된 mm 크기의천을적층하여 PyC 계면상을코팅한프리폼을만들고, 소결조제가첨가된 SiC 분말슬러리를기지상으로함침한후, 1750 o C, 20 MPa 조건에서고온가압소결하여준비하였다. 내열 / 환경코팅은플라즈마용사코팅법으로 Si bond 코팅을한 SiC계세라믹스모재위에 Yb 2 SiO 5 단층이나 Yb 2 SiO 5 와 LGZ (La-Gd-Zirconate) 2 층코팅을하여준비하였다. 삭마시험은 1300~2000 o C 온도범위, 공기중에서수행하였으며, 불꽃생성은케로신연료와산소를이용하였고, 연료압력과유량은 0.12 MPa와 0.08 L/min이었고, 산소압력과유량은 0.22 MPa와 300 L/min이었고, 불꽃과시편의각도는 90 o 이었다. 삭마된시편은무게변화, 미세구조및 X선회절분석, Raman 분석을수행하여산화거동및열화현상을분석하였다. S32-14 Corrosion Behavior of CVD SiC Ceramics in Supercritical Water Environment 초임계수환경에서의 CVD SiC 세라믹의부식거동신정호 *, 김대종, 이현근, 박지연, 김원주. 한국원자력연구원탄화규소 (SiC) 세라믹및복합재료는높은화학적안정성, 우수한고온강도, 낮은열팽창및높은열전도도, 낮은주성자흡수단면적, 낮은유도활성화및중성자조사에대한높은내성으로핵연료피복재및가압경수로용가이드튜브에적용하려는노력이증가해왔다. 핵연료피복관으로사용하기위해서는핵분열생성물유지능력, 정상작동및중대사고발생조건에서의부식특성이중요하다. 고온및고압환경에서 SiC의부식특성은 SiC 세라믹제조방법에크게영향을받는다. 소결법으로제조된 SiC의경우잔류 Si과 B 및 C와같은소결첨가제에의해부식이가속화되었다. CVD SiC 경우다른방법으로제조된 SiC 세라믹보다우수한내식성을나타내었지만, 결정립계에서상당한부식이진행되었다. 특히, SiC 세라믹은고온및고압환경에서산소또는물과반응하여 SiO 2 및 Si(OH) 4 를형성하게되고, 이러한물질이물속으로녹아들게되는반응이반복적으로일어나는부식거동을나타낸다. 그러나 CVD SiC의부식거동에서용존산소, 용존수소등과같은외부요인에의한부식거동만이연구되었고, CVD SiC 세 라믹의재료적특성이나구조적특성에대한연구는제한적으로만보고되었다. 따라서, 본연구에서는다양한 CVD SiC 세라믹의특성과그특성이초임계수환경에서부식에미치는영향에대해연구되었다. S32-15 Fabrication and Ion Irradiation Properties of SiC f /SiC Composites SiCf/SiC 복합체의제조및이온조사특성 Pipit *, Amit Siddharth Sharma, 정동혁, Arifin Septiadi, 윤당혁. 영남대학교 Considerable interest is being paid for the development of SiC fiberreinforced SiC composites (SiC f /SiC) as the potential material for high temperature applications as well as structural components for nuclear reactors. In recent times, extensive research work has been performed to improve the physical and mechanical properties of SiC f / SiC. In this study, a hybrid processing route based on electrophoretic deposition (EPD) combined with hot pressing was adopted to fabricate dense and tough SiC f /SiC. In order to optimize processing conditions, the effects of variation of hot-pressing temperature (1650 and 1750 C) and pressure (10 and 20 MPa) using different sintering additives, such as Al 2 O 3 -Y 2 O 3, Al 2 O 3 -Sc 2 O 3, and Sc-nitrates were examined. The incorporation of dual-coated PyC-SiC interphases on Tyranno SiC fibers allowed better control to expect non-catastrophic failure behavior. SiC f /SiC composite with Sc-nitrate as sintering additives resulted in densities greater than 95% ρ theo and flexural strength in the range MPa showing marked tail extension behavior with ultrafine SiC grains with the mean size of 150 nm. The irradiation test was performed on SiC f /SiC composites with those 3 different types of sintering additives using 0.2 MeV H + ions with a fluence of ions/m 2 at room temperature. Subsequently, postirradiation evolution of microstructural features, such as matrix grain size, pores, cracks, surface roughness and corresponding flexural responses were evaluated. S33-1 Development of Regenerative Scramjet Engine Combustor Using C/SiC Composites Material 재생냉각형스크램제트엔진용탄소섬유강화세라믹복합소재연소기개발김세영 *, 우상국, 한인섭, 방형준, 김수현, 성영훈. 한국에너지기술연구원스크램제트엔진을추진기관으로사용하는극초음속비행체는로켓추진비행체와비교하여동일추진제대비장거리비행이가능하며군사용유도무기분야뿐만아니라우주발사체분야, 초고속정찰기및수송기분야에서유망한미래항공기술로서주목받고있다. 본연구는이러한스크램제트엔진의연소기벽면을엔진연료를이용해냉각하는기술을개발함으로서, 연소벽면의열화방지와주입연료온도상승을통한효율증대효과를동시에달성하는것을목표로한다. 이를위해금속대비고온안정성이우수한탄소섬유강화세라믹복합소재를적용한연소기제조공정과벽면내유로형성공정연구를수행하였다. LSI (Liquis Silicon Infiltration) 법으로제조된연소기소재를입구유동속도마하 2.0의실제스크램제트연소기에적용하여실환경시험을수행하였으며, 연소환경노출시발생하는열화정도를파악하였다. 104 한국세라믹학회

125 구두발표 S33-2 Eco-firendly Inorganic Flame Retardants for Flame Retardant Ceramic Fiber Composites 친환경무기난연제를적용한세라믹섬유난연복합소재임형미 *, 이수연, 문소윤. 한국세라믹기술원세라믹섬유수지복합소재는저밀도, 고강도, 내피로, 내부식성, 전기절연성과저열팽창특성으로우수한물리적, 열적, 화학적, 기계적특성을보이는소재로, 철과알루미늄합금을대체하며그사용이확대되고있다. 그러나화재에대한취약성이그한계로인식되어난연화에대한연구, 특히친환경난연화에대한관심이지속적이다. 소량첨가로난연성이확보되는할로겐계난연제는그사용이제한되고있어친환경난연제로금속수산화물, 인게및질소계난연제에대한연구가활발하고, 전기 / 전자, 수송, 건축등다양한분야에적용되는고분자복합소재에적용된다. 다양한종류의난연제와난연메커니즘및적용, 기계적물성에미치는영향, 그리고적용분야별특성에대해리뷰하고특히건축용난연규제강화에따른적용사례를소개하고자한다. S33-3 Damage and Wear Resistance of Al 2 O 3 -SiC and Al 2 O 3 - CNT Composites 알루미나-탄화규소및알루미나-카본나노튜브복합소재의내마모및손상저항성이기성 1*, 장병국 2. 1 국민대학교, 2 NIMS(JAPAN) 알루미나소재의내마모및손상저항성을향상시키기위하여탄화규소또는카본나노튜브 (CNT) 를분산시켜복합재를제조하였다. 카본나노튜브의경우는부피비로 1, 3, 5, 10, 20% 의비율로분산하여그특성들을비교하였고, 탄화규소의경우는무게비로 2, 5, 10% 의비율을첨가하여그특성들을비교하였다. 알루미나복합재는진공분위기에서방전플라즈마소결법으로 o C 의온도, MPa의압력에서치밀한소결체를얻었다. 복합소결재의기계적특성, 내마모특성과손상저항성을평가하기위하여비이커스압입법 (Vickers indentation), 헤르찌안압입법 (Hertzian indentation), 내마모시험법 (ball-on-disk test) 을활용하였다. 그결과알루미나에카본나노튜브나탄화규소가첨가될경우탄성적이고고경도의특성을나타내었고, 저마찰과샹대적으로적은질량손실의결과를나타내었다. 본발표에서는적은양의카본나노튜브나탄화규소의첨가에의해서도알루미나세라믹스의내마모및손상저항성이뚜렷하게향상될수있다는결과에대해발표하고이에대한토론을진행하고자한다. S33-4 Fabrication of Metal Oxide and Carbon Materials from Coordination Polymers 배위고분자를이용한금속산화물및탄소재료의합성이희정 1*, 오문현 2. 1 재료연구소, 2 연세대학교 Metal oxide materials have received much attention as a result of their functional properties which allow them to be used in a wide range of fields including magnetics, electronics, optics, catalysis and medical diagnostics. Some hybrid metal oxide materials show promise as multifunctional materials. Hybrid oxide materials either consist of a composite of different metal oxides or a composite between a metal oxide and a carbonaceous material. We used coordination polymers as precursors to synthesize of metal oxide and carbon materials. Coordination polymers, which are metal ions or metal clusters coordinated by organic ligands to form diverse structures, have received much attention due to their useful properties. We formulated facile methodologies for the synthesis of metal oxide and carbon materials from coordination polymers. S33-5 Fabrication of Ultra-high Temperature Ceramic Matrix Composites for Extreme Environment 극한환경적용을위한초고온세라믹스섬유강화복합재료의최근개발성과이세훈 *, 배창준, 이희정. 재료연구소재료연구소에서는고순도의초고온세라믹나노분말의합성, 초고온세라믹스의고순도분쇄및분산, 초고온세라믹스슬러리의성형및섬유내함침공정개발, 고순도초고온세라믹스의저온소결조성개발등우수한내삭마특성을갖는초고온세라믹스섬유강화복합재료를제조하기위한다양한연구를수행하였으며최근에는기존의결과를바탕으로각부분에서특성고도화및선단기술개발연구를진행하고있다. 초고온세라믹스나노분말의경우기존결과대비잔류탄소의함량을줄이기위한연구를진행하고있고고순도분쇄및분산연구에서는기존대비개선된장비들을이용한공정특성향상연구를수행중이다. 또한섬유내연속슬러리함침및섬유성형체내의고농도세라믹슬러리함침기술을개발함으로써기존연구대비개선된상대밀도를얻기위한연구를진행중이다. 이들도출된기술들을기반으로 2700 o C 이상의초고온환경에서도우수한내삭마특성을나타내는 C f /HfC-SiC UHTC-CMC를제조하였다. 소결법으로제조된 UHTC-CMC의굽힘강도는최대 122 MPa로낮게나타났는데이는탄소섬유와기지상간의열팽창계수차이 (-0.41 vs / K) 때문에발생한높은잔류응력때문으로생각된다. 제조된 CMC 는우수한섬유뽑힘거동을나타내었으나낮은강도때문에파괴인성은 4.22 MPa m 1/2 로비교적낮게측정되었다. 제조된 UHTC- CMC는 2700 o C, 대기중에서 Mach 0.6의불꽃속도로 Oxyacetylene torch를이용하여 20분이상삭마실험을수행한후에도내부의탄소섬유가산화되지않고잔류하였으며, mm/s의매우낮은삭마율을유지하였으나이보다가혹한조건에서는삭마특성이급격이저하됨을알수있었다. S33-6 Biomorphic Carbon Nanotube Composites Synthesized by Chemical Vapour Deposition 화학증착법에의해합성된바이오모르픽카본나노튜브복합체김익진 *. 한서대학교 The present study focuses on the novel route processing for the synthesis of carbon nanotubes on zeolite coated biomorphic carbon template (BCT). First of all, a biomorphic template with μm pore dimension was prepared by carbonizing Cypress, Gorman spruce, and red pine wood under Ar atmosphere, thereafter, a single phase of zeolite crystals with the crystal size of 0.3 μm were synthesized and homogeneously coated on BCT by an in situ hydrothermal process. Finally, multi-walled carbon nanotubes synthesized on the Co-metal nanoparticles loaded zeolite-biomorphic carbon template (ZCBCT) with acetylene (C 2 H 2 ) as a carbon source by the catalytic chemical vapor deposition (CCVD) method. The Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM) images of the synthesized CNTs on the porous ceramic substrate were observed for morphology, surface quality and structure analysis. This is here the basis for filtration. Crystallinity and defects of the CNTs were studied by Raman spectroscopy and thermo gravimetric analysis (TGA). The CNTs were seen to have grown as bush-like structures creating a close network 한국세라믹학회 105

126 2017 년한국세라믹학회추계연구발표회 inside the pores of the ceramic substrate. The CNTs nano-filter can be used for filtration of gases and has significant filtration efficiency without pressure drop, which is because the carbon nanotubes function as the trap of gas molecules. Moreover, the CNTs nano-filter has been used for the storage of hydrogen gas. S33-7 Ceramic-Matrix Composite Materials Using 2D-Materials for Structural, Optoelectronic, Energy Application 이차원물질을기반으로한세라믹복합체합성과구조, 열전, 광전세라믹스로의응용김종영 *. 한국세라믹기술원 Synthesis of self-assembled nanohybrids using two-dimensional (2D) nanosheets of inorganic solids such as graphene, by adopting softchemical routes such as exfoliation and hybridization, have extensively studied. They possess potential applications for energy storage/conversion, optoelectronics, and structural materials. 2D nanosheets of inorganic solids can be efficiently used as precursors for heterostructured composites. We present several practical examples of the 2D inorganic nanosheets and their nanostructured composites with diverse functionalities such as thermoelectric, optoelectronic, and structural applications. Exfoliation and self-assembly chemistry of metal chalcogenide, layered alloy, and metal oxide will be also discussed in detail. S33-8 Fabrication of Silicon Carbide Nanocomposite Ceramic Fiber Based on Preceramic Polymer Technology 프리세라믹폴리머기반탄화규소계기능성나노복합세라믹섬유제조기술신동근 1*, 이윤주 1, 이현명 1, 배성군 1, 조광연 1, 김영희 1, 권우택 1, 류도형 2. 1 한국세라믹기술원, 2 서울과학기술대학교 Silicon carbide has been spotlighted to advanced ceramics such as the sintered parts in semiconductor process, single crystal wafers for high power semiconductor and SiCf/SiC composites for various hightemperature applications. For more advanced applications, it should be controlled its microstructure and morphology. Especially, nanocomposite structures are expected to show differentiated material properties. Preceramic polymers, the polymeric precursors for ceramic fabrication, makes it possible to realize very versatile and complicate ceramic structures such as fibers which is impossible to fabricated by conventional ceramic process. Furthermore additional doping such as elemental aluminum or boron in polycarboslane plays a role as sintering agent and makes it possible to densify the SiC products. In case of doping titanium, zirconium or hafnium can form the second crystal phase during heat treatment at high temperature up to 1800 C. In this study, we prepared HfC and SiC nanocomposite fiber, new concept of SiC fiber using (Al, Hf) co-doped polycarbosilane. Effect of oxidation curing and doping on crystal formation and microstructural change during heat treatment were investigated using XRD, FE-SEM, Raman spectrometer and HR-TEM. S33-9 Mechanical Properties of in-situ Growth Carbon Nanotubes Reinforced Porous Ceramics by Direct Foaming 직접발포성방법에의해카본나노튜가보강된다공체세라믹스의기계적특성박중규 1*, 이기성 2, 김익진 1. 1 한서대학교, 2 국민대학교 This paper reports the formation of carbon nanotube (CNT) reinforced porous Al 2 O 3 ceramics by a novel combination of three processes. Porous ceramics are developed using direct foaming. Cobalt nanoparticles as catalysis agents aresimultaneously synthesized and dispersed by colloidal process to prepare the suitable catalyst material for carbon nanotubes synthesis. The catalytic chemical vapour deposition (CCVD) technique is used to directly synthesize CNTs within the porous ceramics and the effect of growth time on the morphology, crystallinity and yield of CNTs are investigated. Hertzian indentations are used to evaluate the damage behaviour under constrained loading conditions.the mechanical behaviour from indentation load-displacement curves is compared according to CNT contents in the samples. G4-1 Highly Sensitive Sensors based on Pd-coated Si Nanowire Arrays for Detection of H 2 in Air and Oil 공기및유중수소검지를위한팔라듐이증착된실리콘나노선어레이기반의고감도수소센서장병진 *. 연세대학교 We report an advanced approach for H 2 gas sensing using both n- and p-type Si nanowires (NWs) arrays, which were fabricated by aqueous electroless etching and sputtering. The as-synthesized Si NWs were vertically aligned on the substrate and Pd was coated on the top surface of Si NW arrays. At a criterion of base resistance, the resistances of the Pd-coated Si NWs upon exposure to H 2 showed different behaviors with different carrier types: higher in the n-type arrays whereas lower in the p-type arrays. The sensitivity (S = 1700% at 1% H 2 ) of the p-type arrays was much greater than that of the n-type arrays (S = 75%). Furthermore, the change in carrier density depending on H 2 concentration was big in the p-type arrays, while it was negligible in the n-type arrays. It was found that a Schottky barrier was formed between Pd layer and n-si NWs (φ M > φ SC ) before exposure to H 2 and an Ohmic contact (φ M < φ SC ) was formed after H 2 exposure. However, the opposite results were seen between the Pd and p-si: Ohmic contact (φ M > φ SC ) before exposure to H 2 and Schottky barrier (φ M < φ SC ) after exposure to H 2. Therefore, the p-type Si NW arrays have higher sensitivity to H 2 than the n-type Si NW arrays. We also discussed H 2 sensing properties of Pd-coated Si NWs in transformer oil. G4-2 Preparation and Characterization of Ceramic/Photopolymer Composites with High Dispersion Stability for SLA 3D Printing Application SLA 3D 인쇄응용분야에서높은분산안정성을지닌세라믹 / 포토폴리머복합재료의제조및특성규명송세연 1*, 이정우 2, 윤지선 1. 1 한국세라믹기술원, 2 부산대학교 To prepare ceramic/photopolymer composites with high dispersion stability for SLA 3D printing application, Al 2 O 3 ceramic particles were coated by silane coupling agent (VTES, vinyltriethoxysilane), and then VTES-coated Al 2 O 3 ceramic particles were dispersed in commercial photopolymer (3DK-A83B) by interpenetrating network (IPN) phenomena. The average coating thickness of VTES-coated Al 2 O 3 ceramic particles were investigated by field-emission transmission electron microscopy (FE-TEM), and particle size distribution of VTES-coated Al 2 O 3 ceramic particles was measured by laser 106 한국세라믹학회

127 구두발표 scattering particle size distribution analyzer. Initial dispersibility and dispersion stability of VTES-coated Al 2 O 3 /3DK-A83B composites solution were investigated by relaxation nuclear magnetic resonance (NMR) and Turbiscan. Furthermore, the dispersion stability was observed as a function of VTES-coated Al 2 O 3 ceramic particle contents, and the ceramic/photopolymer composites with a content of 40 wt% were 3D-printed and then sintered. The cross-sectional images of 3D-printed objects were investigated by field-emission scanning electron microscopy (FE-SEM), and about 48% of the volume shrinkage of 3D-printed object was observed after sintering. G4-3 Observation of Grain Boundaries in Chemical Vapor Deposited Graphene 화학기상증착법으로합성한그래핀의결정립계관찰방법이종영 1*, 이지환 1, 김민정 1, 이철호 2, 이관형 1. 1 연세대학교, 2 고려대학교 Graphene has received great attention due to its superior physical properties, which make graphene suitable for multiple applications. Among various growth techniques, chemical vapor deposition on catalytic metal films holds great promises for a mass production of graphene. Even though extensive efforts have been devoted to synthesizing high-quality graphene, formation of defects is not avoidable during production. The grain boundaries have a dominant effect on its properties, inspiring efforts to modify the CVD growth process to minimize formation of GB between graphene grains. A transmission electron microscopy is well defined, however, we need to invent easy way to alter TEM due to its complicated sample preparation. Here we report a technique to optically observe GBs in CVD-grown graphene via optical microscopy, allowing rapid assessment of graphene quality. The local oxidation of copper through the damaged GBs induces an optically distinguishable color change in the underlying copper due to different extend of oxidation between the two copper regions under grains and GBs. Our observation technique for GBs of graphene paves a path for understanding fundamental mechanisms of graphene growth and efficient quality evaluation of largescale graphene sheet for mass production. Furthermore, we integrated movable plasma generator and typical CVD system for realizing in-situ process of GB observation or additional surface treatment technique on as-grown product. G4-4 Graphene Etch Masks and Etch Stops for Van Der Waals Heterostructures 반데르발스이종접합구조의그래핀에칭마스크권준영 1*, 손장엽 2. 1 연세대학교, 2 University of Illinois at Urbana- Champaign Two-dimensional (2D) materials and their van der Waals (vdw) heterostructures provide a variety of platforms for observation of unprecedented physical phenomena in atomically confined 2D sheets and fabrication of multifunctional electronic devices. In atomically thin vdw heterostructures, however, it becomes difficult to etch or pattern the heterostructures with atomic precision. Here we report a novel technique to etch and pattern the vdw heterostructures using graphene as a etch mask and etch stop. By exposure to XeF 2 gas, graphene is fluorinated, meanwhile other 2D materials such as hexagonal boron nitride (hbn), transition metal dichalcogenides (TMDs) are effectively etched away. Therefore, in the vdw heterostructures, graphene can be used as a etch mask and etch stop. Using this mask, we first fabricated hbn-encapsulated graphene devices with pinhole contacts, where metal touches fluorinated graphene region and graphene channel is perfectly protected. The pinhole contacts showed extremely low contact resistance about 200 Ω μm. Strikingly, the mobility of graphene reached 140,000 cm 2 V -1 s -1 at room temperature, which reaches to the theoretically estimated value. We also fabricated various graphene devices with via contacts connecting doubly-stacked two graphene sheets or suspended structure applicable to a resonator. Our work shows a new way to selectively etch and pattern vdw heterostructures, leading us a step closer to realization of all-2d-material-based electronic devices. G4-5 Van der Waals Epitaxial Growth of α-moo 3-x Nano Sheets on Various 2D-Substrates and their Surface Characterizations 반데르발스에피성장을통한 α-moo 3-x 나노시트의이종 2차원물질위에서의성장및표면특성연구김종훈 1*, Jatis Kumar Dash 1, 권준영 1, 현창배 2, 이관형 1. 1 연세대학교, 2 UNIST Since successful isolation of graphene with one-atom layer, various two-dimensional (2D) materials, such as hexagonal boron nitride (hbn) and transition metal dichalcogenides (TMDs), have attracted an increasing attention due to their unique properties and remarkable potential in electronic applications. So far, the 2D transition metal oxides (TMOs) have been less studied compared to other 2D families due to lack of their production methods. As electrical/optical properties of TMOs are broadly tunable owing to the diverse chemical compositions, crystal structures, and oxygen vacancies, it is expected that 2D TMOs are a family of the most promising 2D materials and beneficial for many applications. Here we report a novel van der Waals epitaxial growth method of mono/a-few-layered α-moo 3 nanosheets on the various 2D substrates. Our results indicate that van der Waals epitaxial growth is an effective way to fabricate highly crystalline MoO 3 nanosheets. Our surface characterization show that MoO 3 is an effective insulator even in a few nanometer scale and electrical properties of surface potential and bandgap can be modulated by modifying the surface and introducing oxygen vacancies. Our work shows a promising way to produce high quality 2D oxides with epitaxial relation and a possibility of MoO 3 as a dielectric and insulating material. G4-6 Performance Optimization of Gate-tunable Graphene Mesh on Si Schottky-junction Solar Cells 그래핀메쉬 / 실리콘쇼트키접합태양전지의성능최적화김수한 *, 박원일. 한양대학교 Graphene on Si Schottky junction solar cells (SJSCs) have recently shown rapid increase of power conversion efficiency with simple structure and easy fabrication process, thereby being considered as a promising alternative to conventional p-n junction solar cells. Such a rapid enhancement of the PEC, yet it is still lower than the best record of the metal/si Schottly junction solar cells (20%), illustrates that the junction-potential plays an importance role of the cell performance. Graphene show the electrically tunable Fermi level, optical transparency, and substantial permeability to electric field and it 한국세라믹학회 107

128 2017 년한국세라믹학회추계연구발표회 means that remains lot of room for improvement of PCE. In this study, we introduced graphene and graphene mesh sheets as Schottky electrodes on n-si SJSCs and investigated their power generation characteristics depending on the Vg applied to the cells. Compared with the SJSC with graphene, the cell with graphene mesh exhibited a higher PCE and a more sensitive response to photovoltaic parameters at Vg. The advantages of the graphene mesh can be attributed to the existence of holes that increase the work function and permeability across the electric-field. G4-7 Electrical and Thermoelectric Transport Properties of Chemically-exfoliated Two-dimensional RuO 2 Nanosheets RuO 2 기반 2차원나노시트의전기적및열전특성문홍재 *, 김정민, 유솜이, 노종욱, 이우영. 연세대학교 We present the electrical and thermoelectric transport properties of two-dimensional RuO 2 nanosheets (NSs). The enhancement in electrical transport properties of exfoliated individual RuO 2 NSs was systemically investigated for their application in flexible electronics and optoelectronics. Decoration of Ag nanoparticles on the surface of the RuO 2 NSs provides donor electrons and dramatically increases the electrical conductivity of the monolayer RuO 2 NSs by up to 3700%. The n-type doping behavior was confirmed via Hall measurement analysis of the doped RuO 2 NSs. The layer number- and temperaturedependence of the conductivity were also investigated. Moreover, carrier concentration and mobility were obtained from Hall measurements, indicating that the undoped RuO 2 NSs had ambipolar transport and semi-metallic characteristics. Thermoelectric properties of pristine and Ag-doped RuO 2 NSs were also investigated. For pristine RuO 2 NSs, the sign of the Seebeck coefficient changes with temperature from 350 K to 450 K. This indicates that the dominant type of charge carrier is dependent on the temperature, and the RuO 2 NSs show ambipolar carrier transport behavior. By contrast, the sign of the Seebeck coefficient for Ag nanoparticle-doped RuO 2 NSs does not change with temperature, indicating that the extra charge carriers from metal nanoparticles promote n-type semiconductor behavior. S41-1 Thermal Conductivity Reduction for High Performance (Bi,Sb) 2 Te 3 Thermoelectric Materials 고효율 (Bi,Sb) 2 Te 3 열전소재를위한열전도도저감전략김상일 *. 서울시립대학교 The widespread use of thermoelectric technology is constrained by a relatively low conversion efficiency of the bulk alloys, which is evaluated in terms of a dimensionless figure of merit (zt). The zt of bulk materials can be improved by reducing thermal conductivity through nanostructuring approaches including nanograin-composite, nanoprecipitates, and point-defects. In this talk, the approaches for further reducing thermal conductivity in (Bi,Sb) 2 Te 3 based thermoelectric materials will be discussed. First, the effectiveness of dense dislocation arrays in Bi 0.5 Sb 1.5 Te 3 for lattice thermal conductivity reduction will be described based on Debye-Callaway model with experimental results, and the strategies to form those dense dislocations will be discussed. Then, the bipolar thermal conductivity, which is widely known for (Bi,Sb) 2 Te 3 -based alloys at high temperature > K, will be discussed. Some examples for suppressing bipolar thermal conductivity by substitutional doping will be described based on the Debye- Callaway model as well. S41-2 High-quality Thermoelectric 2D Chalcogenide Films via van der Waals Epitaxy 반데르발스에피탁시로성장한고품질 2차원칼코게나이드열전박막황재열 1*, 이규형 2, 김성웅 1. 1 성균관대학교, 2 강원대학교 Demands on high-quality layer structured two-dimensional (2D) chalcogenide films are growing due to the findings of remarkable physical properties and potentials for device applications. However, the difficulties in controlling epitaxial growth with defect density and the poor understanding of van der Waals epitaxy (vdwe) for 2D chalcogenide film on the substrate have been major obstacles for the further advances of these materials. In this research, we demonstrate new approaches enabling the vdwe of 2D chalcogenide epitaxial films on 2D and 3D substrates, individually. As a proof of concept, highly oriented crystalline bismuth antimony telluride thermoelectric films were epitaxially grown on 2D (graphene) and 3D (α-al 2 O 3 ) substrates by pulsed laser deposition exploiting the surface reaction of the substrate with chalcogen and the growth mechanism of these films on 2D and 3D substrates via vdwe were elucidated. In particular, this peculiar vdwe renders the high-quality 2D chalcogenide film with high carrier mobility and low defect density comparable to single crystal. Furthermore, exceptionally low thermal conductivity were observed in these vdwe films. S41-3 Boundary Engineering for High-performance Thermoelectirc Materials 고성능열전소재를위한계면제어연구문현아 1*, 이규형 2, 김성웅 1. 1 성균관대학교, 2 강원대학교 Thermoelectrics, which transports heat for refrigeration or converts heat into electricity directly, is a key technology for renewable energy harvesting and solid-state refrigeration. Despite its importance, the widespread use of thermoelectric devices is constrained because of the low efficiency of thermoelectric bulk alloys. However, boundary engineering has been demonstrated as one of the most effective ways to enhance the thermoelectric performance of conventional thermoelectric materials such as Bi 2 Te 3, PbTe, and SiGe alloys because their thermal and electronic transport properties can be manipulated separately by this approach. In this talk, we review our recent progress on the enhancement of the thermoelectric figure of merit through boundary engineering together with the processing technologies for boundary engineering developed most recently using Bi 2 Te 3 -based bulk alloys. A brief discussion of the principles and current status of boundary-engineered bulk alloys for the enhancement of the thermoelectric figure of merit is presented. We focus mainly on (1) the reduction of the thermal conductivity by grain boundary engineering and (2) the reduction of thermal conductivity without deterioration of the electrical conductivity by phase boundary engineering. We also discuss the next potential approach using two boundary engineering strategies for a breakthrough in the area of bulk thermoelectric alloys. S41-4 Highly-efficient Thermoelectric Materials by Electrodeposition Process 108 한국세라믹학회

129 구두발표 김지원 1*, 이규형 2, 임재홍 1, 명노상 3. 1 재료연구소, 2 강원대학교, 3 University of California, Riverside Metal chalcogenide nanostructures have been extensively implemented for high-performance thermoelectric applications, which can directly convert waste-heat-energy into electricity, with the support of theoretical and empirical results. In fact, finding a novel and cost effective synthesis approach that facilitates the formation of stable and reproducible nanostructured thermoelectric materials determines the commercial applicability. We herein demonstrate the synthesis of metal chalcogenide nanostructures with outstanding thermoelectric performance by an electrodeposition technique, which is one of the most versatile methods for low dimensional nanostructures in a cost effective and scalable manner. Precise control over dimension, chemical composition, crystallinity, crystal structure, preferred orientation, and the attainment of nanoinclusions and/or intermetallic phases based on thermodynamically favored solid-state phase transition yields optimal electrical transport and thermoelectric properties of the metal chalcogenide nanostructures. In this presentation, n-type Bi 2 (Te,Se) 3 and p-type Sb 2 Te 3 films were electrodeposited, followed by an annealing process to tune their crystallinity. The material, electrical, and thermoelectric properties of those metal chalcogenide nanostructures are systematically investigated for thermoelectric applications. S41-5 Thermoelectric Properties of K-doped (SnSe) 1 x (SnS) x Fabricated by Hot Press Sintering Lin, Chan-Chieh *, Dianta Ginting, 이종수. Kyung Hee University Recently, we reported an extremely low thermal conductivity of 0.11 W/mK and very high thermoelectric zt of 1.67 at 823 K for Ag 0.01 Sn 0.99 Sn 0.85 Se 0.15 compound, which is the state-of-the-art value for polycrystalline SnSe compound. The extremely low thermal conductivity mainly comes from the Se-rich precipitates and grain boundaries. The thermoelectric performance of the compound is limited by low solubility of Ag in SnSe, implying that further enhancement of thermoelectric performance is expected for the increase of chemical potential. In this work, we substitute potassium as a doping element instead of Ag, which possesses higher solubility in SnSe. The K doping generates holes effectively without reducing the carrier mobility. Here, we prepared K x Sn 1 x Se (x = 0, 0.1, 0.3, 0.5, 1.5, and 2.0%) and K y Sn 1 y Se 0.87 S 0.15 (y = 0, 0.1, 0.2, 0.3, 0.5, and 0.7%) by melting and hot press sintering. We find the lamellar structure by Se-rich precipitates and grain boundaries as in the case of previous reported Ag-doped SnSe SnS, which is confirmed by scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). Transmission electron microscopy (TEM) analysis also identifies the nano-scale point defects by SnS alloying. The precipitations and point defects cause strong phonon scattering, resulting in significant reduction of the lattice thermal conductivity. Therefore, K Sn Se sample shows low thermal conductivity of 0.35 W/mK and high zt value of 1.11 at 823 K. S41-6 Effect of Phas e Transition on the Band Gap and Thermoelectric Properties of Cu 2 SnSe 3 상전이가 Cu 2 SnSe 3 의밴드갭및열전특성에미치는영향 SIYAR MUHAMMAD *, 조준영, 남재현, 류종훈, 지상구, 박찬. Seoul National University Cu 2 SnSe 3 attracted attention from the researchers of thermoelectric (TE) community, due to its high electrical conductivity and tunable transport properties. Various allotropes were reported for this compound, but cubic and monoclinic are two major phases at high and low temperature,respectively. TE properties of mono clinic phase are widely reported, while TE performance of cubic phase is not yet explored. Stoichiometric composition of Cu 2 SnSe 3 was synthesized at various temperatures, and Rietveld refinement shows that monoclinic and cubic rich phases exist for the material. TE properties of high temperature phase (cubic Cu 2 SnSe 3 ) was studied for the first time, and it was found that it has 200 times higher ZT (~0.9) than monoclinic phase at 600 K. Better performance of high temperature cubic phase can be attributed to the small band gap (~0.95 ev) compared to that of monoclinic Cu 2 SnSe 3 (~1.0 ev) at room temperature, which was found by UV-Vis spectroscopy analyses. DFT analysis further confirmed the high conductive metallic nature of cubic phase Cu 2 SnSe 3. Thepower factor (PF = S2σ) at 600 K was increased from 0.09 mwm -1 K -2 to 0.25 mwm 1 K -2 for monoclinic to cubic phase transition, but the change of thermal conductivity was not significant. That small polymorphic modification with increasing temperature can result in compositionally similar but different crystallographic phases, is one possible reason for nearly similar thermal conductivities of the two phases. S41-7 Enhanced Thermoelectric Properties of Oxygen Deficient SrTiO 3 산소결함을통한 SrTiO 3 열전성능향상 Jamil 1*, Nguyen Van Du 1, 서원선 1, 김명호 2, 이순일 1. 1 한국세라믹기술원, 2 창원대학교 In this work, we investigated the effect of oxygen vacancies in undoped SrTiO 3 for thermoelectric application. The undoped SrTiO 3 samples were synthesized through traditional solid-state reaction method. First the samples were sintered in air at 1350 C for 30 h and then the samples were subsequently reduced by annealing at 1300 C for 30 h by using different low oxygen partial pressures. The reducing atmosphere were produced by (H 2 /Ar) gas. With decreasing the oxygen partial pressures results an increase in the electrical conductivity through the charge compensation of oxygen vacancies, n e 2[ ]. Based on these results, the power factor of the samples after annealing at low oxygen partial pressure was W m -1 K-2 at 305 K, which is markedly high as compared other oxide thermoelectric. In addition to this, these oxygen vacancies act as a phonon scattering center, which lead to decrease the thermal conductivity. As a result, the samples after annealing at low oxygen partial pressure were found to enhance the ZT value of about 13-times compared to samples reduced under relatively high oxygen partial pressure. S41-8 High Performance Shape Engineerable Thermoelectric Materials 고성능형상제어형열전소재손재성 *, 김민석, 조승기, 추승준. 울산과학기술원 Output power of thermoelectric generators depends on device engineering minimizing heat loss as well as inherent material 한국세라믹학회 109

130 2017 년한국세라믹학회추계연구발표회 properties. However, the device engineering has been largely neglected due to the limited flat or angular shape of devices. Considering that the surface of most heat sources where these planar devices are attached is curved, a considerable amount of heat loss is inevitable. To address this issue, here, we present the shapeengineerable thermoelectric painting and 3D printing, geometrically compatible to surfaces of any shape. We prepared Bi 2 Te 3 -based inorganic inks using the molecular Sb 2 Te 3 chalcogenidometalate as a sintering aid for thermoelectric particles, with ZT values of 0.5~0.7 for n-type and 1.0~1.2 for p-type materials that compete the bulk values. Devices directly brush-painted onto curved surfaces produced the high output power of 4.0mWcm 2 under the temperature difference of 50 o C. Also, the shapes of 3D blocks printed by dispensing process were controllably varied to cube, circle, and half ring. Half-ring shaped thermoelectric 3D blocks were used to fabricate the cylindrical power generating module with three n-type and p-type pairs, which exhibited mw-level power under the temperature difference of 30~40 o C. These approaches paves the way to designing materials and devices that can be easily transferred to other applications. S41-9 Microstructural and Thermoelectric Properties of Ge 1-x-y - Sb x Si y Te Materials Ge 1-x-y Sb x Si y Te 열전재료의미세구조와열전특성이호성 *, 김삼영. 경북대학교열전소자는폐열을전기에너지로직접변환시킬수있기때문에최근에많은관심을받고있다. 열전소자의효율은열전재료의무차원성능지수 ZT = S 2 st/k에의존한다. 여기서 S는제벡계수, s 는전기전도도, k는열전도도, T는절대온도이다. 무차원성능지수 ZT를높이기위해서는파워팩터 (S 2 s) 를높이는동시에열전도도를낮추면된다. 그러나제벡계수, 전기전도도, 열전도도는서로커플링이되어있어성능지수를높이는일이쉽지만은않다. 그러나다행히도열전도도는전자에의한열전도도와포논에의한열전도도로이루어져있어재료의미세구조에의존하는포논열전도도를독립적으로제어할수있다. GeTe 기반열전재료는중온용으로성능지수가 ZT~1.5로매우높은값을보이고있다. GeTe에 Bi 와 Sb를동시에첨가하면밴드컨버전스현상을일으켜성능지수를상당히향상시킬수있다는보고가있었다. 그러나 Ge과같은족에속하는 Si의첨가효과에대한연구결과는전무하다. 따라서 GeTe에 Si과 Sb를동시한첨가한 GeSiSbTe 열전재료의미세구조와열전특성에대해발표할것이다. S41-10 Process Parameter Dependence of Microstructure in an n-type Cu doped Bi-Te Thermoelectric System 제조공정변화가 Cu 첨가된 n형 Bi-Te 계열전소재의미세구조에미치는영향최순목 1*, 서강현 1, 이순일 2, 김일호 3, 신원호 2, 김종배 4, 양승호 4, 황창원 5, 최병준 5. 1 한국기술교육대학교, 2 한국세라믹기술원, 3 한국교통대학교, 4 ( 주 ) 희성금속, 5 ( 주 ) 제펠 Bi 2 Te 3 계열전소재의물성에미치는 Cu 첨가제의영향은많은연구가보고되고있다. Cu 첨가량변화와제조공정변화를주며 Bi 2 Te 3 계열전소재의미세구조형성에미치는영향과열전특성의변화에대하여연구하였다. 박막공정의경우, DC/RF sputter를이용하여 Cu와 Bi 2 Te 3 를 co-sputttering 방법으로상온에서박막을증착후결정성향상을위해 Ar 분위기에서 150, 300, 500도로열처리를실시하였다. 이후에 Bi 2 Te 3 박막에도핑된 Cu의함량을조절하기위하 여 RF/DC sputter 용타겥을서로맞바꾸어유사한실험을실시하여미세구조변화를관찰하였다. 이와달리다층박막제조공정실험으로서, Bi 2 Te 3 와 Te 박막을 DC/RF sputter 를이용하여각각증착한후, 그위에 Cu 박막을증착하여 Cu/Bi 2 Te 3 와 Cu/Te 박막을제조평가하였다. 이와병행하여 bulk 실험도병행하였으며박막실험과 bulk 실험의차이에대하여고찰하였다. S41-11 Thermoelectric Materials Using the Polar Intermetallic Compound in the Solid-State Chemistry Field 고체화학영역에서의극성금속간화합물을활용한열전재료남근우 *. 한국지질자원연구원고체화합물인금속간화합물은두가지이상의금속이결합해다양한구조및물성을보이는화합물을의미한다. 금속간화합물은복잡한구조를갖고반도체적인성향을띄기때문에최근열전재료로각광받고있다. 하지만금속간화합물은매우복잡한구조를갖고있고다루기쉽지않기때문에그물질의본질적인특성을이해하고물성을증가시키기위한연구는쉽지않다는단점이있다. 본발표에서는고체화학자의관점에서기존에열전소재로가능성있는물질의물질자체를이해하고이를활용할수있는방향으로의이론적, 실험적인접근에대해논의하고자한다. S41-12 Fabrication of Wide Gas Concentration Range Thermochemical Hydrogen Gas Sensor with Pt Decorated Graphene and Thermoelectric Nanowire/Polymer Composite 백금 / 그래핀촉매와열전나노선 / 고분자복합체를이용한광대역수소농도열화학센서의제조송요셉 *, 김세일, 좌용호. 한양대학교 Hydrogen gas attracts attention for wide field such as synthesis chemical product, detection of pipe connection leakage, new energy source and so on. However, hydrogen gas is dangerous to use because of wide explosive concentration range of that. Therefore early detection of hydrogen gas leakage is most important to use. In this research, we report the wide hydrogen gas concentration range thermochemical hydrogen (TCH) sensors composed of thermoelectric nanowire and polymer composite and hydrogen catalyst such as bismuth telluride nanowire/poly (methyl methacrylate) (PMMA) and Pt decorated graphene. Bismuth telluride nanowire was fabricated by solvothermal method and bismuth telluride/pmma composite was fabricated by hot compaction method. Pt was impregnated at graphene and coated on the top electrode. The hydrogen catalyst, Pt decorated graphene, which was synthesized by impregnation of Pt with graphene solution. The TCH sensor was shown a detection range from 200 ppm to 2 vol% hydrogen gas. In future work, we are going to research change of thermoelectric composite Seebeck coefficient to enhance signal of TCH sensor. S42-1 High Performance Telluride-based Paste Materials 고성능 telluride계페이스트소재손재성 *, 조승기, 김민석, 추승준. 울산과학기술원 Telluride-based materials have attracted tremendous attentions for various technological applications such as thermoelectrics and photovoltaics as energy conversion materials. Especially, Bi 2 Te 3, Sb 2 Te 3, and PbTe have been regarded as the workhorse thermoelectric materials due to their high energy conversion efficiencies. Here, we report the synthesis of telluride-based thermoelectric paste or ink 110 한국세라믹학회

131 구두발표 materials to be applied to the shape-engineerable thermoelectric painting and 3D printing, geometrically compatible to surfaces of any shape. thermoelectric painting and 3D printing, geometrically compatible to surfaces of any shape. We prepared Bi 2 Te 3 -based inorganic inks using the molecular Sb 2 Te 3 chalcogenidometalate as a sintering aid for thermoelectric particles, with ZT values of 0.5~0.7 for n-type and 1.0~1.2 for p-type materials that compete the bulk values. Devices directly brush-painted onto curved surfaces produced the high output power of 4.0 mwcm 2 under the temperature difference of 50 o C. Also, the shapes of 3D blocks printed by dispensing process were controllably varied to cube, circle, and half ring. Half-ring shaped thermoelectric 3D blocks were used to fabricate the cylindrical power generating module with three n-type and p-type pairs, which exhibited mw-level power under the temperature difference of 30~40 o C. These approaches paves the way to designing materials and devices that can be easily transferred to other applications. S42-2 Development of X-ray CT Contrast Agents Based on Tantalum Oxide Nanoparticles and their Applications 탄탈륨나노입자기반의 CT 조영제개발이노현 *. 국민대학교 Computed tomography (CT) is based on x-ray attenuation of elements. In order to increase the sensitivity of CT, small iodinated compounds are used as injectable contrast agents. However, the iodinated contrast agents are excreted as urine, thus exhibit short circulation times. In addition, the X-ray attenuation of K-edge of iodine is not efficient for clinical CT that uses high-energy X-ray. Due to these limitations, nanoparticles based on heavy atoms such as gold, lanthanides, and tantalum are used as more efficient CT contrast agents. Uniformly sized tantalum oxide nanoparticles were prepared using a microemulsion method, and their surfaces were modified using various silane derivatives. The silane-modified surface enabled facile immobilization of functional moieties such as polyethylene glycol (PEG) and fluorescent dyes. PEG was introduced to endow the nanoparticles with biocompatibility and antifouling activity, and immobilized fluorescent dye molecules enabled simultaneous fluorescence imaging as well as X-ray CT imaging. The resulting nanoparticles exhibited remarkable performances in the in vivo X-ray CT angiography and bimodal image-guided lymph node mapping. We also performed an extensive study on in vivo toxicity of tantalum oxide nanoparticles, revealing that the nanoparticles did not affect normal functioning of organs. S42-3 Nanoprobes for Miniaturized Diagnostic Systems 미니어처진단시스템을위한나노프로브박용일 *. 전남대학교 Isolating and detecting sparsely distributed molecular targets, such as circulating tumor cells, DNAs, microvesicles, and soluble proteins, is of great importance for disease monitoring and diagnostics. With recent advances in nanomaterials and microfabrication, various new biosensor platforms have been introduced, promising highly sensitive and selective molecular detection. In these platforms, nanomaterials typically bind to molecular targets and generate distinctive analytical signatures; microfabricated devices could then detect or manipulate labeled targets with spatial and temporal resolution. Among various biosensor platforms, magnetic biosensor, nano-plasmonic sensor, and smartphone-based sensor platforms will be discussed. S42-4 Application of Nanostructured Materials Fabricated by Electrochemical Process 전기화학공정을이용한나노구조체제조및응용임재홍 *. 재료연구소 Electrochemical process has been attracting attentions because of its many advantages including low-cost, rapid deposition rate, and ease of control their microstructure and crystallinity by adjusting electrochemical parameters. Among many applications, electrochemical deposition techniques can be used for the generation of renewable energy sources such as thermal, hydrogen energy, etc. In this study, we investigated the optimization of high efficient thermoelectric materials and photocatalytic electrode. Thermoelectric compounds such as Sb 2 Te 3, Bi 2 Te 3, and Bi 2 Se 3 have been extensively studied because of their potential applicability for efficient energy harvesting and cooling devices. We synthesized nano-dots/phases embedded thermoelectric materials by electrochemical process, resulting that the power factor was about 60% thermoelectric performance compared to the bulk counterpart. Secondly, for photocatalytic electrode, the control of the exposed facets on the surface of the photoelectrode are important to enhance the performance and reliability of the photoelectrodes in the PEC reactions, because they affect to the interface area between the electrode and the electrolyte, minority carrier diffusion length, optical absorption depth, and so on. The detailed results will be presented. S42-5 Thermal/electrical Conducting Properties of Polymerbased Nanocomposites with Incorporation of 1-D/2-D Nanofillers with Controlled Orientation & Assembly under Application of Electric Fields 폴리머기반나노복합체제조에서 1-D/2-D 나노입자의전기장을이용한배향및배열제어에따른열전도도및전기전도도물성에대한영향조홍백 *, 좌용호. 한양대학교 Electrically insulating polymeric nanocomposites with high thermal conductivity have great potential for use as thermal-management materials in increasingly high-power-density electronics and optoelectronics. Conventional composite materials require a large amount, over 70 vol%, of electrically conducting fillers such as carbon allotropes to attain thermal conductivities of 1~5 W/mK, which restricts the utility of these materials to applications that require both electrical and thermal conductivities. Here, we introduce electric field application techniques to control the assembly of inorganic fillers at a low level of filler loading ( 15 vol%) and to achieve strongest enhancement of thermal conductivity in polymer matrix are introduced. Boron nitride, carbon nanotubes, nano-/micro-diamonds and graphite nanosheets have been incorporated into electrically insulating polymer matrices to produce thermally conductive, polymer-based nanomaterials. The homogeneous suspension of filler particles and prepolymer mixture was cast onto a polyamide spacer and subjected to different electric fields before the mixture became cross-linked. Linearly aligned filler assembles were fabricated in the hybrid film which were aligned 한국세라믹학회 111

132 2017 년한국세라믹학회추계연구발표회 perpendicular to the film surface with high anisotropy. Mechanisms for the field-induced fabrication and structural variation of the 1-D/2- D filler assembly in the polymer matrix are elucidated in relation to enhancement of the physical properties. S42-6 Single Crystalline 1D Nanostructures Composed of Transition Metal Ditellurides 이텔루륨화전이금속의 1차원나노단결정권순용 *. 울산과학기술원 Following the celebrated discovery of graphene, considerable attention has been directed towards the rich spectrum of properties offered by van der Waals crystals. However, studies have been largely limited to their two-dimensional (2D) properties, due to lack of 1D structures. Here, we report the growth of high-yield, single-crystalline 1D nanobelts composed of transition metal ditellurides at low temperatures (T~500 C) and in short reaction times (t 10 min) via the use of tellurium-rich eutectic metal alloys. The synthesized semimetallic 1D products are highly pure, stoichiometric, structurally uniform, and free of defects, resulting in high electrical performances. Furthermore, complete compositional tuning of the ternary ditelluride nanobelts is achieved with suppressed phase separation, applicable to the creation of unprecedented low-d materials/devices. This approach may be used as a general strategy for fabricating 1D layered nanostructures and is truly exciting opportunity that can lead to dozens of new 1D nanomaterials of electronic quality. S42-7 A Study on Synthesis and Optical Application of Quantum Dots 양자점의합성과광학적응용에관한연구김범성 *, 정다운, 서한욱, 김민영, 오이슬. 한국생산기술연구원 Many efforts have been made to increase the efficiency of Quantum Dots (QDs) by using a core/shell structure. However, the conventional method of creating the core followed by shelling has the disadvantage of repeated processing. In this study, we synthesize composition gradient quaternary ZnCdSSe QDs of high efficiency through one-pot synthesis. The X-ray diffraction peak for the (111) plane in ZnCdSSe QDs was shifted 2.64 compared to that for pure CdSe. From Cscorrected STEM-EDS line scan results, it can be seen that the center of the QDs consists for more than 40% of Cd, clearly showing that a CdSe-rich core was formed, while the amount of Zn increases significantly toward the outer area. In addition, QDs at the modified interface were applied to QD-sensitized solar cells, which showed a 25.5% increase in photoelectric conversion efficiency owing to the reduced electron confinement effect. The increase seems to be caused by the excited electrons being relatively easily transferred to the level of TiO 2 owing to the reduced electron confinement effect. Consequently, the electron confinement effect was observed to be reduced by increasing the Zn 1-x Cd x Se-rich phase at the interface. This means that, based on the thermodynamic simulation, the interface between the core and the surface of the QDs can be controlled. The improvement of optical and electronic properties by controlling interfaces and surfaces during the synthesis of QDs, as reported in this work, can be useful for many applications beyond solar cells. G5-1 Production of Bio-jet Fuel Range Alkanes from Catalytic Reactions of Jatropha Oil on TiO 2 Supported Catalyst 자트로파유로부터 TiO 2 기반촉매를이용한바이오항공유생산황경란 *. 한국에너지기술연구원 Considerable attention has been focused on bio-fuels as an alternative to fossil-based fuels because of the finite fossil fuel resources, energy security and growing environmental concerns. Many studies have been performed to produce more efficient and cheaper bio-fuels from various non-edible and waste sources. Recently, bio-based jet fuels have been intensively investigated by the aviation transport industry as a solution to help reduce significant green-house gas emissions and the carbon tax in the EU. AWOx/Pt/TiO 2 was prepared for the catalytic deoxygenation of Jatropha fatty acids with no added hydrogen to produce oxy-free hydrocarbons, which can be transformed into bio-jet fuel. W addition to the Pt/TiO 2 showed remarkably enhanced performance, a degree of deoxygenation of 86%, which is more than two times higher than that of the Pt/TiO 2, even though the WOx/TiO 2 had almost no activity for deoxygenation reaction. The enhanced Pt-related hydrogen uptake, measured by H 2 -TPR, and XPS analysis showed the intimate contact of W with Pt nanoparticles supported on TiO 2. This tight contact allows for easier C-C cleavage over Pt nanoparticles and this is assisted by the strong bonding between W and oxygen in the reactant, resulting in more C 17 hydrocarbon production on the WOx/Pt/TiO 2. G5-2 Biocompatible Implant Electrodes Operating in Body Fluid for Energy Storage Devices 체액기반생체삽입형에너지저장장치채지수 *, 노광철. 한국세라믹기술원 Implantable electronic medical devices (IEMDs) can potentially be used to solve various clinical problems including monitoring chronic diseases and electro-organ transplantation. We describe a new technique for IEMDs that is capable of providing energy storage using natural ions in body fluids as electrolytes for a supercapacitor. The system is constructed with a solar cell for energy harvesting and a supercapacitor for energy storage. By assembling IEMDs with two biocompatible electrodes MnO 2 nanoparticles affixed to multiwalled carbon nanotubes as the positive electrodes and phosphidated activated carbon as the negative electrodes, this technique avoids the problems of performance degradation and toxicity. These two biocompatible electrodes were successfully implanted into the subcutaneous layer of rat skin, with both electrodes showing stable performance as a supercapacitor. These findings establish a platform for potential biocompatible materials for implantable energy storage devices. G5-3 Development of Attrition Ball Mill Pretreatment System for Improving Fermantable Sugar and Study of Process Conditions 발효당생산성향상을위한 attrition 방식의볼밀전처리장치개발및공정조건연구구양모 *, 이진형. 한국세라믹기술원목질계바이오연료생산을위해서는복잡한구조를가진바이오매스의효소접근성을향상시키기위한전처리공정이필수적이다. 본연구에서는 attrition 방식의볼밀을이용한목질계바이오매 112 한국세라믹학회

133 구두발표 스전처리장치를개발하고이에대한공정연구를실시하였다. 개발된전처리장치는 batch 공정으로서바이오매스와볼의마찰이발생하는밀링용기와온도를조절하는외부용매순환부로구성되고밀링용기의내부온도를조절하는온도조절기가부속장치로연결되어있다. 본실험에사용된바이오매스는중국산동성에서 2016 년수확된옥수수대 (corn stover) 를사용하였으며, milling 에사용되어진볼의재질은 steel 이다. 볼의회전속도는 300 rpm 으로모두동일하게하였으며, 온도별로습식과건식으로옥수수대를전처리하였다. 전처리후 SEM 을이용하여바이오매스의표면변화를관찰하였고, Particle Size Analysis (PSA) 를통해입도분포를측정하여분쇄효과를비교분석하였다. 당화조건은 50 mm Sodium acetate (ph 4.8) 에전처리옥수수대와완충용액의고액비를 2 wt% 로동일하게맞춘후 cellulase 를 15FPU/g-biomass 농도로주입하여당화를실시하였다. 최종적으로생산된글루코즈양의분석을통해본연구에서개발된볼밀전처리장치의최적조건을확인하였다. G5-4 Characteristics of Biomass Depending on Ball Properties during Physical Pretreatment 물리적전처리에사용되는 ball의특성별바이오매스변화권정회 1*, 이진형 2, 구양모 2. 1 에코바이오홀딩스 ( 주 ), 2 한국세라믹기술원현대사회에서가장이슈가되는항목중, 화석에너지와신재생에너지의비교분석은앞으로다가올우리의생활에많이적용될것으로전문가들이분석한바있다. 본연구는에너지효율이좋은장점과환경오염의주범으로꼽히는화석에너지의대체에너지로환경적인측면과에너지효율측면에서도장점을가지는신재생에너지개발에중점을두고자바이오연료중, 바이오에탄올의원료가되는 glucose의생산성증가를위한연구에가치를두었다. 리그노셀룰로직바이오매스로부터 glucose를생산하기위해서는효소가수분해가필수적이나, 물리적 화학적전처리가없는상태에서는효소가반응하기어려운점을가지고있어, 전처리공정의단점중, 하나인환경오염을줄이고자 100% 물리적전처리를이용한바이오매스의연구를진행하였다. 이는화학적전처리방법보다짧은공정시간과저비용, 환경오염의저감을보여주는가장효율적인전처리방법이다. 바이오매스는 70 o C에서 24시간건조되어진옥수수대로 planetary milling machine에서 300 rpm으로시간별 size distribution을실시하였다. Milling에사용되어진 ball의재질은각각 alumina, zirconia, steel, 세종류이며, 동일한크기와부피비율로실험을진행하였다. Ball의특성을분석하기위해, 형상측정레이저마이크로스코프를이용하여, 표면적을그래프로나타내었으며, XRD pattern을이용하여, 전처리한바이오매수의결정성변화와 S.E.M을이용한바이오매스의표면변화를측정하여, 비교분석하였다. G5-5 Screening of Hydroxyapatite Binding Peptides for Sustained Release of Bioactive Molecules on Hydroxyapatite 바이오활성물질의서방출을위한하이드록시아파타이트결합펩타이드스크리닝방진호 *, 김성현. 한국세라믹기술원 Hydroxyapatite (HAp) is a bioceramic which has a variety of medical applications for bone diseases. This biomaterial has the outstanding biocompatibility and bioactivity which is suitable for artificial bone substitutes. Recently, the loading and sustained release of bioactive molecules on hydroxyapatite is important to enhance bioactivity with osteoconduction and osteoinduction. Here, we screened hydroxyapatite binding peptides for sustained release of bioactive molecules using phage library with 8 mer randome peptides. After 4th biopanning, the enrichment of phage is successfully performed and we isolated three excellent peptides. After binding/release characterization, the one peptide showed that about 80% of the peptide were still attached to the surface after one week. In addition, we constructed fusion peptide between HAp binding peptide and bioactive BMP7 fragment. We expect that the hydroxyapatite binding peptides will help to improve the treatment for bone and dental repair. G5-6 Development of Nickel Ferrite Nanoparticle Clusters for the Efficient Separation of Histidine-tagged Proteins 히스티딘택이부착된단백질의효율적인분리를위한니켈페라이트나노입자클러스터개발천진녕 1*, 이진우 2. 1 한국세라믹기술원, 2 포항공과대학교본연구에서는니켈페라이트나노입자클러스터 (nickel ferrite nanoparticle clusters) 를개발하고, 이를히스티딘택 (histidine-tag) 이부착되어있는단백질의분리에활용하였을때, 단백질의효율적인자성분리와더불어반복적인재사용이가능함을확인하였다. 니켈페라이트나노입자클러스터는에틸렌글리콜을사용하는용매열합성법을통하여제조되었으며, 산화제를추가로도입하여금속니켈입자가독자적으로형성되는것을방지할수있었다. 본연구에서개발된소재는니켈페라이트가히스티딘택과결합할수있는니켈이온을보유함과동시에, 나노입자클러스터구조로인하여높은표면적 (105 m 2 /g) 과포화자화도 (41.3 emu/g) 및초상자성 (superparamagnetic) 특성을나타내어, 히스티딘택이부착된단백질의자성분리에적합한다양한장점을가지고있음을확인했다. 니켈페라이트나노입자클러스터를재조합단백질분리실험에활용해본결과, 히스티딘택이부착된단백질의선택적인분리와더불어자성을이용한분리효율성이우수함을확인하였으며, 수차례의재사용에도단백질분리능력이유지됨을확인하였다. G5-7 Improving Applicability to Plasmid DNA Purification of γ-fe 2 O 2 Core-shell Nanoparticles through Surface Treatment 표면처리를통한 γ-fe 2 O 2 코어-쉘나노입자의플라즈미드 DNA 정제로의적용성증진한진순 1*, 안계석 1, 김태균 1, 채동호 1, 박형빈 2, 이현승 1, 최성철 1. 1 한양대학교, 2 한국세라믹기술원 γ-fe 2 O 3 (maghemite) has been well known as promising materials for the bio-technology such as plasmid DNA due to its unique magnetic property. However its applicability for the DNA purification could be worsened by strong aggregation between particles of γ-fe 2 O 3. In this study, through forming SiO 2 coating layer using on the surface of γ- Fe 2 O 3, interparticle repulsive force had been improved for its dispersibility. SiO 2 coating layer was formed on the surface of γ-fe 2 O 3 through sol-gel method using tetraetylorthosilicate (TEOS) for SiO 2 precursor. Additionally prior to SiO 2 coating, acid/base surface treatment was performed to improve affinity of the surface with SiO 2 layer. Suitable surface treatment method to γ-fe 2 O 3 particles was selected by scanning electron microscope (SEM), vibrating sample magnetometer (VSM), and zeta potential analysis. Consequently, plasmid DNA purification ability of synthesized γ-fe 2 O 2 nanoparticles was compared with that of commercial Fe 3 O 4 nanoparticles by agarose gel electrophoresis. 한국세라믹학회 113

134 2017 년한국세라믹학회추계연구발표회 G5-8 Ceramic-based 3D Printing Techniques for Biomedical Applications 바이오메디컬응용을위한세라믹 3D 프린팅기술고영학 *, 안민경, 이정빈, 맹우열, 이윤희. 고려대학교 In recent years, additive manufacturing (AM) techniques using ceramic-based materials have attracted a great deal of attention for biomedical applications, since they can construct ceramic structures resembling the 3D anatomical shape of individual patients. In addition, these AM techniques can tightly control a porous structure of porous ceramic scaffolds, thus providing high mechanical properties and excellent bone regeneration ability when used as bone scaffolds. We herein introduce several types of ceramic-based 3D printing techniques, recently developed by our group, including ceramic-based stereolithography, photocuring-assisted 3D plotting, ceramic/ camphene-based 3D extrusion, and rapid direct deposition of ceramic paste. Unlike conventional 3D printing techniques, our approaches particularly using specially-designed ceramic-based feedstocks can create microporous ceramic walls in a controlled manner, which can more closely mimic a hierarchical architecture of natural bones. In addition, we will demonstrate the utility of our approaches to construct complex-shaped ceramic structure, for example, free-standing structures with high shape retention capability, which would open new avenues for the designing and production of porous ceramic scaffolds with advanced functions. G5-9 Cells and Bioactive Molecules Laden Organic/Inorganic Hybrid Microsphere for Bone Tissue Engineering 박홍현 1*, 변규빈 2, 윤희숙 1. 1 재료연구소, 2 과학기술연합대학원대학교 To deliver cells and bioactive molecules, well-defined scaffold is very crucial for tissue engineering approach. We developed alginate/ hydroxyapatite hybrid microspheres by encapsulator as cell and protein delivery carrier. We could easily load cell and protein in the microspheres without loss of their bioactive functionality because these microspheres were prepared with mild condition via ionic crosslinking. We verified the viability of loaded cell was maintained after encapsulation and biological functionality of released Bone Morphogenetic Protein 2 (BMP-2) from microsphere was also preserved. These BMP-2 loaded hybrid microspheres also showed suppression of initial burst and sustained release behavior from the microspheres in comparison with plain alginate microsphere. In addition, we investigated bone tissue regeneration efficacy of these microsphere by histological and immunohistochemical analysis, quantitative assay for ALP activity and calcium formation, and osteogenic marker gene expression. We successfully demonstrated a potential of these hybrid organic/inorganic microsphere for bone tissue development and these might be utilized in biomedical field as cell and protein carrier for tissue engineering approach. G5-10 Novel Self-assembly-induced Gelation for Nanofibrous Collagen/Hydroxyapatite Composite Microspheres 젤화를통해유도된자가조립나노섬유형콜라젠 / 하이드록시아파타이트마이크로스피어최재원 *, 김종우, 조인환. 고려대학교 This study demonstrates the utility of the newly developed selfassembly-induced gelation technique for the synthesis of porous collagen/hydroxyapatite (HA) composite microspheres with a nanofibrous structure. This new approach can produce microspheres of a uniform size using the droplets that form at the nozzle tip before gelation. These microspheres can have a highly nanofibrous structure due to the immersion of the droplets in a coagulation bath (water/ acetone), in which the collagen aggregates in the solution can selfassemble into fibrils due to ph-dependent precipitation. Bioactive HA particles were incorporated into the collagen solutions, in order to enhance the bioactivity of the composite microspheres. The composite microspheres exhibited a well-defined spherical morphology and a uniform size for all levels of HA content (0 wt%, 10 wt%, 15 wt%, and 20 wt%). Collagen nanofibers several tens of nanometers in size were uniformly present throughout the microspheres and the HA particles were also well dispersed. The in vitro apatite-forming ability, assessed using the simulated body fluid (SBF) solution, increased significantly with the incorporation of HA into the composite microspheres. G5-11 Fabrication and Characterization of Micro-scale Calcium Phosphates Beads for Bioapplications 생체적용을위한마이크로크기의인산칼슘염 bead 제작및특성변규빈 1*, 윤희숙 2, 박홍현 2. 1 과학기술연합대학원대학교, 2 재료연구소 Calcium phosphate is one of the main component of human bone which is broadly used for biomedical applications and therapeutic purpose. In this study, we successfully fabricated calcium phosphate micro-beads with narrow particle size distribution using microencapsulator. Particle size was controlled by adjusting both nozzle sizes and amount of calcium phosphate. Shape of beads could be adjusted by controlling frequency, pressure and surface charge. Porosity was also controlled by changing amount of calcium phosphate. The size of sintered micro-bead was from several tens of micrometer to several hundreds of micrometer. The protein loading efficiency of the micro-bead was 21.1 to 59.8% with surface area range from 0.4 to 0.8 m 2 /g. The micro-beads showed sustained protein release behavior, which might be potential to induce bone formation as regeneration active molecule such as BMP-2. G5-12 Two-Step Sintering of Partially-Stabilized Zirconia for Applications in Ceramic Crowns Darmawan bobby aditya *, J.G. Fisher, 오계정, 박상원. 전남대학교 Partially-stabilized ZrO 2 is used in ceramic crowns due to its excellent mechanical properties and bio-inertness. Being opaque, ZrO 2 does not match the natural colour and translucency of tooth enamel. A translucent or transparent ZrO 2 material would improve the aesthetics of ceramic cores. In polycrystalline ceramics, the main sources of scattering are grain boundaries and pores. To reduce scattering of light, the grain size of ZrO 2 ceramics should be less than the wavelength of visible light and porosity should be eliminated. Hot pressing and spark plasma sintering can be used to prepare translucent partially-stabilized ZrO 2 but the equipment costs are prohibitive. Two-step sintering (TSS) is a sintering schedule that has been developed to sinter samples to high density while controlling the grain growth. The sample is sintered at a high temperature (T 1 ) for a short time to achieve > 75% TD and then at a temperature about 한국세라믹학회

135 구두발표 150 o C lower (T 2 ) for a long period to induce densification with minimal grain growth. In this work, samples of a commercial powder (ZPex, Tosoh Corp., Japan) were sintered under two-step sintering conditions. The first step temperature (T 1 ) is at 1400 o C holding for 5 minutes, followed by a second step temperature (T 2 ) at 1350 o C and holding for 5-20 h. Samples conventionally sintering at 1450 o C for 2 h were used as comparisons. The density and grain size of specimens are measured. Crystallographic phase, translucency and mechanical properties of selected samples are studied. G5-13 Material Extrusion Printing of Calcium Phosphate Scaffolds - Effect of Processing Temperature on Physical and Biological Properties RAJA NAREN 1*, 박홍현 2, 윤희숙 2. 1 과학기술연합대학원대학교, 2 재료연구소 C alcium phosphate pastes are frequently used in dental and bone tissue regeneration as self-setting pastes and as starting material for scaffold preparation. The properties of such scaffolds depend on the microstructure which is based on the processing temperature. Calcium phosphates can be processed at different temperatures - from room temperature (37 C) to high temperatures (1400 C). In this study, we compare the effect of different processing temperatures on the physical properties such as microstructure and composition, which effect the biological response. Homogeneous calcium phosphate pastes were extruded into standard 3D structures. Scaffolds undergo cement reaction whereby they were divided based on processing temperature. Nano-sized sheets of calcium deficient hydroxyapatite and micro-sized rods of di-calcium phosphate di-hydrate were observed for scaffolds processed at room temperature (37 C) using hydrolysis and acid base reaction respectively. Scaffolds processed at 500 C, 1100 C showed minor changes in microstructure and complete change in composition respectively. Invitro cell tests showed favorable results for room temperature fabricated scaffolds. Fabrication and processing of scaffolds at room temperature might give us the chance for various scaffold functionalization such as cell and drug loading based on applications. G5-14 Effect of V 2 O 5 Colorant on the Crystallization and Coloration of Lithium Disilicate Glass-ceramics V 2 O 5 착색제가리튬디실리케이트결정화유리의결정화와착색에미치는효과에대한연구김다미 1*, 유상임 1, 김형준 2. 1 서울대학교, 2 한국세라믹기술원 In the last two decades, the lithium disilicate glass-ceramics has been applied to all-ceramic dental crown due to its high strength and excellent aesthetic. To obtain the high aesthetics of crown, the color and translucency are mainly concerned. Coloring the glass is conducted by adding colorants such as 3d transition metal or rareearth elements which absorbs certain range of visible light. However, the color of glass-ceramics depends on the valence state of colorant ion which could be changed during crystallization. In addition, the crystalline phase reflects the light and affects brightness of color and translucency. While the mechanical properties of LS2 glass-ceramics have been extensively studied, reports on the effect of colorant on the crystallization, coloration, and translucency of LS2 glass-ceramics are quite rare. In this work, we investigated the effect of V 2 O 5 colorant on the crystallization sequence and coloration of multicomponent lithium disilicate glass-ceramics. The glasses were heat-treated at 500 o C for 1 h as nucleation step and at 800 o C for 2 h as growth step. The color of glass-ceramics was measured by the UV/vis spectrometer in CIElab system indexing the color parameter and calculating color differences. The translucency was calculated by the contrast ratio. Detailed effect of the colorants on color and translucency of LS2 glass-ceramic samples will be presented for a discussion. G6-1 Physical Properties, Applications and Domestic Growth Technology of LithiumTantalate Single Crystals Lithium Tantalate 단결정의물리적성질및응용과국내성장기술강봉훈 *. 극동대학교 LiTaO 3 단결정은 SAW 필터소재로서다른압전체보다특성이뛰어난물질로알려져있다. 큰직경의 LiTaO 3 단결정은 Czochralski 방법으로얻고있는데많은물량이수입에의존하는것으로알려져있다. LiTaO 3 및 doped-litao 3 단결정에대한물리적성질및응용과국내성장기술등에대하여소개한다. G6-2 Development of the Glass Phosphors for High Power LED Lighting System 고출력 LED용유리형광체개발김선욱 1*, 남윤희 1, 김병호 1, 황종희 1, 김진호 1, 이영진 1, 전대우 1, Kenji Toda 2. 1 한국세라믹기술원, 2 Niigata University Recently, glass phosphors have been extensively investigated as the promising materials for high power white LEDs due to their excellent thermal and chemical stabilities, good heat- or light resistance and ease of formability. Several studies have been conducted to achieve the high optical efficiency of the glass phosphors by modifying the refractive index of the glass, composition of glass, as well as the particle size of the phosphor and content of the phosphor in glass. In our research group, we have focused on glass materials, such as the composition, light transmission, glass frit size, to realize the novel glass phosphors with a high luminescent efficiency. It was demonstrated in our previous studies that the luminescence efficiency of the glass phosphors strongly depended on the glass materials. In this study, we present the luminescent properties of the glass phosphor controlled the glass composition, frit size, and transmission and discusses on the effect of the glass materials on the luminescent properties of the glass phosphors. Additionally, we introduce a novel synthesis technique for the development of novel glass phosphors and discusses on the optical properties of the novel glass phosphors prepared by this method. G6-3 Evaluation of Fixed Abrasive Pad for Eco-friendly Lapping Process of Various Glass Substrate 다양한유리기판의친환경래핑공정을위한고정연마입자패드평가서영길 *, 박성호, 신희재, 문덕주, 조시형. 엠씨케이 ( 주 ) 고릴라글라스는플라스틱과달리색이변하거나투명도가떨어지지않으면서일반유리와비교해단단하고얇게만들수있기때문에디스플레이를보호하는부품으로적합하다. 이러한물리적특성으로인해 2007년등장한애플의아이폰에처음탑재된이후 30여개글로벌기업이약 1,000 종이상의제품에고릴라글라스가사용되고있다. 고릴라글라스뿐만아니라보로실리케이트, 쿼 한국세라믹학회 115

136 2017 년한국세라믹학회추계연구발표회 츠, BK7, 소다라임과같은글라스또한무색투명하며, 순도가높고, 굴절률이높기때문에일반적인광학어플리케이션 ( 광학렌즈, 광학유리등 ), 광정밀및광소재등에다양하게사용되고있다. 광학유리의원료를석영도가니와백금도가니에서 1, 2 차용해하여서서히냉각시키면서유리질화된물질이잉곳형상으로만들어진다. 성장된잉곳은와이어쏘우공정을통해웨이퍼로절단되고래핑과폴리싱을통해원하는두께와평탄도를맞추고화학기계적연마 (Chemical Mechanical Polishing; CMP) 공정으로결함이없고평탄한상태의웨이퍼로가공된다. 웨이퍼평탄도확보와표면의스크래치와같은결함을제거하기위해래핑과폴리싱과같은광역평탄화공정의중요성이커지고있다. 본연구에서는다이아몬드연마입자가표면에부착되어있는고정연마입자패드를이용한다양한유리기판의래핑공정평가를실시하였다. 래핑공정은다이아몬드고정입자패드 (Xonite 2, 3, 5, 8, 10 μm Diamond Lapping Pad, MCK ) 를초순수 (De-Ionized Water; DIW) 에쿨런트를이용하여양면 Lapping tool (DSM 9B- 5P-IV, Speedfam, Japan) 을이용하여실시한후, 연마율 (removal rate) 및표면조도 (surface roughness) 등을분석하였다. G6-4 Correlations between Retroreflectance and Refractive Index of Glass Beads for Road Marking Applications 도료표지용유리알의재귀반사도와굴절률의상관관계신상열 1*, 이지인 1, 정운진 2, 김진호 3, 조성훈 4, 최용규 1. 1 한국항공대학교, 2 공주대학교, 3 한국세라믹기술원, 4 이화정공야간및우천시차선의시인성을제고하기위하여사용되는도로표지용유리알의재귀반사도는해당유리의굴절률에매우민감하게변화하기때문에유리알형태를그대로유지하면서굴절률을정확히측정하는것이중요하다. 일반적으로유리알의굴절률은베케라인법을활용하여측정할수있으나, ~1.8 이상의굴절률을가지는표준굴절액이시판되지않기때문에고굴절유리알의굴절률을측정할수있는새로운평가방법에대한연구가필요하다. 본연구에서는유리알의굴절률과재귀반사도의관계에대한계산결과를상용재귀반사도측정장비를이용하여얻은재귀반사도실측결과를상호비교하였다. 계산결과와실측결과의차이를발생시키는요인을분석하기위하여유리알시편의반지름, 구형도, 색, 표면상태등을조사하였다. 이와더불어측정조건을다양하게변화시켜재귀반사도를측정하고분석함으로써재귀반사도의상대적인변화를이용하여굴절률을정확하게평가할수있게끔하는유리알의조건및재귀반사도측정조건을정하고자하였다. G6-5 Functional Low Expansion Glass Ceramic based on Rare Earth Doped Li 2 O-Al 2 O 3 -SiO 2 System 희토류첨가 Li 2 O-Al 2 O 3 -SiO 2 계기능성저팽창결정화유리장재원 *, 박경대, 한가람, 정운진. 공주대학교 Li 2 O-Al 2 O 3 -SiO 2 (LAS) 계를기반으로한결정화유리는낮은열팽창계수와높은열충격특성으로인해가정용전기 cook-top 상판및천체망원경렌즈등으로널리사용되고있다. 본연구는 LAS계유리에희토류이온을첨가하여발광특성이부여된기능성결정화유리에대한연구를진행하였다. 희토류이온은 Eu, Sm, Pr, Dy, Tb을첨가하였으며, 상용 LED를이용하여발광특성을분석하였다. 실험결과, Eu을첨가하였을시 Eu 2+ 및 Eu 3+ 에의한발광이동시에나타나는것을확인할수있었다. T x ~T c 사이의온도범위에서열처리조건을조절하여결정화를진행한결과, 낮은열팽창계수를가지는 beta-eucryptite 결정상과 Eu에관련된결정상인 Eu 2 Ti 2 O 7 (Eu 3+ ), Ba 0.8 Eu 0.2 TiO 3 (Eu 2+ ) 을가지는것을 XRD 분석을통해확인하였다. 발광특성이열처리에따라변화함을확인하였으며, 열처리후시료의경우여기광원에따라발광이변화하는것을확인하였다. 365 nm 로여기시 Eu 2+ 결정에의한 blue 발광이주로나타났으며, 400 nm 여기시 Eu 3+ 결정에의한 red 발광이주로나타나는특성을확인하였다. 이러한발광특성의원인분석을위해, SEM, SEM-EDS, TEM-EDS 및 CL 분석등을실시하였다. G6-6 Influence of Oxygen Addition into Ternary Ge-Sb-Se Chalcogenide Glasses for Inrared-Transmitting Lens Applications 적외선투과렌즈용삼성분계 Ge-Sb-Se 칼코지나이드유리의산소첨가효과이준호 *, 이우형, 김현, 이지인, 최용규. 한국항공대학교최근소형화된적외선카메라모듈의스마트폰적용을위시하여다양한사양의적외선카메라에대한민수분야의수요가증가하고있는데, 적외선투과렌즈소재로서공정비용및광특성조절측면에서칼코지나이드유리소재가매우유망하다. 원적외선대역을투과할수있는 Se 기반칼코지나이드유리형성시스템중에서삼성분계 Ge-Sb-Se 유리가열적 / 기계적안정성이우수하기때문에렌즈응용의적합성관점에서본칼코지나이드유리의물리적 / 화학적특성을평가하고분석하는연구가필요하다. 이러한연구의일환으로본연구팀은 Ge-Sb-Se 유리의표면또는내부에존재하는산화물의영향을파악하고자하였다. 구성원소중하나인 Ge 성분의일부를 GeO 2 형태로대체하여유리를제작함으로써의도적으로유리에산소를첨가하였으며, 유리내부의산소함량에따른물성변화를조사하였다. 또한, 표면산화를위하여 250 o C의산화분위기에서유리를열처리하고, 이에따른광특성의변화를분석하였다. G6-7 Fabrication of Glass Filament for Glass Fused Deposition Modeling 유리용융형 3D 프린팅을위한유리필라멘트제조박형빈 1*, 최재호 1, 한윤수 1, 김형준 1, 최성철 2. 1 한국세라믹기술원, 2 한양대학교현재 3D 프린터는압출, 파우더소결, 시트접합, 인발, 분사등의적층방식과폴리머, 종이, 목재, 금속식재료등의재료에따라다양한기술로구분할수있다. 그중 Fused Deposition Modeling(FDM) 방식은필라멘트형태의물질을노즐안에서녹여얇은필름형태로출력하여적층하는기술로써재료는폴리머가가장널리사용되고있다. FDM 방식은표면조도의퀄리티가높지않고제작속도가매우느린단점이있는반면에다른 3D 프린팅기술에비해장치의구조와프로그램이간단하여장비가격과유지보수비용이낮고다양한소재적용이가능한장점이있다. 최근연구에서 glass fused deposition modeling이란개념으로유리소재의 3D 프린팅법이제시되었다. 그러나이러한방식은용융로를압출노즐로사용하여설비가대형이며점성이높은용융유리를기체압력을이용해사출하는방식으로노즐내경을줄이는데한계가있어정밀한형상을위한선폭제어가어렵다. 본연구에서는 FDM 방식을이용한 3D 프린팅을위해유리필라멘트제조장비를자체제작하였고, 유리조성, 용융온도, pull-out 속도조건에따른유리필라멘트직경을제어하였으며, 제조된유리필라멘트를이용해유리용융형 3D 프린팅을시도하였다. G6-8 Phosphor-in-glass with Nd-doped Silicate Glass for Wide Color Gamut White LED 116 한국세라믹학회

137 구두발표 Nd-첨가 silicate 유리를이용한고색재현성백색 LED용 Phosphorin-Glass 김성현 1*, 한가람 1, 임원빈 2, 정운진 1. 1 공주대학교, 2 전남대학교기존의 LCD-BLU용백색 LED는유기바인더에녹색및적색형광체를혼합하여사용하여왔다. 그러나, 유기바인더는고출력장시간운용시열화에의한갈변현상으로인해효율저하와색좌표의이동이발생하는치명적단점이있다. 특히, 녹색및적색형광체는넓은발광선폭으로인해색재현범위가한정되어, 고색품질의 LCD 적용에한계가있다. 이를보완하기위해, 최근색변환소재로서양자점이사용되고있으나, 낮은장기내구성과높은생산단가의단점이있고, 또다른방식의색변환소재인 phosphorin-glass(pig) 는내구성이우수한동시에제조방법이비교적간단하나, 형광체를직접적용하기에역시넓은선폭으로인한색재현범위의한계가문제되고있다. 본연구에서는, 녹색및적색형광체의넓은발광선폭을제어하기위해 Nd 3+ 가첨가된 SiO 2 -BaO-ZnO-R 2 O(R=Li, Na) 계유리를제조하고, 녹색형광체로서 Lu 3 Al 5 O 12 :Ce 3+ (LuAG) 및적색형광체로서 CaAlSiN 3 :Eu 2+ (CASN) 을복합첨가한 PiG를제조하였다. 백색을구현하기위해유리및형광체비율을조절하였으며, 최적의발광스펙트럼조절을위해 Nd 3+ 의농도도변화시켰다. 제조된 PiG 는적분구를이용하여 PL spectrum, 색좌표, CRI 및색재현범위를측정하였다. 기존 yellow 형광체만첨가된 PiG 및 Nd 3+ 이첨가되지않은녹색및적색함유 PiG를제조하여비교한결과, 이들보다넓은색재현범위를나타낸것을알수있어, 향후고품질 LCD-BLU용광원으로서의가능성을확인하였다. G6-9 Controlling Infrared Transmission Spectrum of Chalcogenide Glasses via Doping of Rare Earths or Transition Metals 미량의희토류또는전이금속원소첨가를통한칼코지나이드유리의원적외선대역투과스펙트럼조절김현 *, 이준호, 이우형, 최용규. 한국항공대학교일반적으로칼코지나이드유리의단파장투과단은밴드갭천이에기인하는흡수에의하여결정되며, 장파장투과단은다중포논흡수에의하여결정된다. 원적외선대역까지투과하는셀레나이드유리의경우, 단파장투과단이대개의경우 ~800 nm 부근에서위치하기때문에광학적투과창은 0.8 ~ 15 mm 범위에서형성된다. 해당유리를원적외선대역에국한하여사용하고자하는경우에는투과창을원적외선카메라가주로사용하는파장대역인 8 ~ 12 mm 범위로제한하는경우도필요할수있다. 이러한고려를바탕으로, 본연구에서는 Ge-Sb-Se 유리를대상으로적절한희토류또는전이금속원소를미량첨가함으로써야기되는근적외선및중적외선대역의전자천이에기인하는흡수를활용하여원적외선대역을전후한파장에서의투과스펙트럼의선형을조절하고자하였다. S61-1 High Transmittance and Antimicrobial Activity with Resistance against Water and Acid Water Using Al-doped ZnO Thin Films Al-doped ZnO 박막을이용하여물또는산성비에강하면서높은투과도와항균력의특성평가윤순길 *, 최형진. 충남대학교 Antimicrobial activity via silver and zinc nanoparticles deposited onto glass panels have been reported because most of electronic device panels including smart phone are commonly infected by microorganisms such as bacteria and molds. Recently, although nanoparticles were homogeneously coated onto the glass panels via vacuum process of sputtering, because they showed a weak adhesion with the glass panels when they were repeatedly touched and swiped, ZnO and Al-doped ZnO (AZO) thin films with an antimicrobial activity have been reported for a strong adhesion. Although the Al (10 atomic %)-doped ZnO films exhibited a sufficient reduction of Zn and Al ions release in the water, transmittance of the AZO films was reduced by a morphology change of the AZO films after dipping into the water and acid (ph = 4.0) although the antimicrobial activity was still strong. For transparent glass panels with no reduced transparency after contacting with the water or the acid water, coating of a new phase should be demonstrated for environmentally friendly glass panels. For environmentally friendly transparent glass panels, 30 nmthick zinc aluminate coated glass panels were studied for transmittance, antimicrobial activity, variations in morphology and release of the Zn and Al ions after dipping into the water and acid (ph = 4.0, 4.5, and 5.0) water. S61-2 Oxide Coated Glass for Flexible Optoelectronic Devices 유연광전소자를위한산화물코팅된기능성유리김수영 *. 중앙대학교 Flexible electronics are pliable, thin, light-weight, and impact-resistant, and have many possible applications. Despite flexible substrate and fabrication methods have been studied in numerous reports, the flexible substrates cannot be used in conventional mass production facilities due to their flexibility. Here, we present an innovative approach to sacrificial material and fabrication process of flexible organic light-emitting diodes (OLEDs) using laser transfer technology. An amorphous gallium oxide (α-gao x ) was used as a sacrificial layer for laser lift-off. The atomic structure of α-gao x on near-midium range order was changed owing to oxygen deficiency and local absorption centers in bandgap increased laser ablation as the power density of electron-beam evaporator was increased. The α-gao x can be completely melted by laser irradiation, thus allowing the OLEDs to be lifted off the glass substrate. The results suggest that the laser liftoff process can be integrated into high temperature processes for fabricating flexible organic devices. [Acknowledgement] This research was supported in part by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. 2015K1A3A1A ). S61-3 Smart Window Application of Chromogenic Materials 변색물질의스마트윈도우응용한승호 *. 전자부품연구원 The term smart window refers to a group of chromogenic materials that change their light transmission properties when some form of external stimuli such as electric field, temperature change, light irradiation, exposure to gas are introduced. The ability of these materials to change opacity and/or color has been numerous applications, including architectural use, residential and commercial construction, interior design, museum artwork expositions, high-end appliances, advanced displays, automotive mirrors and privacy glass. In this presentation, various smart window technologies including electrochromic (EC), thermochromic (TC), liquid crystal (LC), and 한국세라믹학회 117

138 2017 년한국세라믹학회추계연구발표회 suspended particle display (SPC) are introduced. In addition, ongoing researches performed in KETI are introduced. S61-4 The Materials Technology Required for the Extended Application of Heatable Glasses 발열유리의확장된응용을위해필요한재료기술류도형 1*, 이정욱 2, 박성환 2, 이성민 2. 1 서울과학기술대학교, 2 ( 주 ) 세온내열유리혹은소다라임유리위에산화물전도막혹은저항막을도포하고, 이에적절한단자전극을형성하면소위발열유리저항가열체가된다. 이면상의저항가열체에상용의전압을인가하면전류-저항가열에의하여손쉽게상온에서 60도 ~ 100도정도의범주내의발열을하는발열유리가만들어진다. 자동차용발열유리, 냉장고용발열유리등이그러한범주에들어간다. 이런분야이외에도발열유리는더다양한분야에도적용될수있을것으로기대할수있다. 예를들어, cook-top용발열유리등이궁극적으로그러한범주에들어갈수있다. 발열체의온도가이경우에는쉽게 500도이상에서 800도의범주에이르게되므로각재료의고온특성이중요한제한이된다. 발열유리는발열박막과박막이얹혀지는유리기판의특성이서로잘어우러져야만 500도이상의고온에서활용이가능할것인데, 그렇지만, 아쉽게도이러한분야에대하여산업적으로성공한사례가없고, 또재료과학적으로확고한실험적고찰이시도된것도없는듯하다. 본강연에서는고온에서의발열유리의산업적응용확장을위한사례들을소개하고, 이때의저항가열체로서의고유한특성과그한계를분석하고, 또한그한계를극복할수있는방안들에대한고찰을하고자한다. S61-5 DLC 가증착된적외선 window 의광학적특성권민철 *, 정주연, 유동휘. ( 주 ) 유니벡최근열감지센서및열영상처리를위한적외선광학계에관한연구가광학산업에서큰주목을받고있다. 본실험에서는광학계구성소자인적외선용 window, 및 lense 재료로사용되는 Ge, Si, ZnS, ZnSe, Chalcogenide 등의재료에 DLC 를증착하여박막의내구성및광학적특성을조사하였다. DLC 박막증착은양산성을고려하여대면적증착이가능한 PECVD 방법을사용하였다. 증착된박막의두께는 α-step 으로측정하였고, 내구성조사를위하여테이프, 내마모, 염수분무실험등을실시하였다. 적외선광학재료의중요한특성인투과도는적외선분광기를사용하여측정하였다. 실험결과 DLC 박막의투과도는증착된박막의두께와연관이있었다. 각재료들은 DLC 증착공정에서내구성향상을위한중간층이필요하며이에대한최적조건을조사하였다. 양산성향상방안으로, 일반적인 DLC+window+AR 증착방법대신 DLC+window+DLC 증착방법을소개한다. G7-1 Early Hydration Characteristics of Chemical Composition of Hauyne-Belite Cement 화학조성변화에따른 hauyne-belite cement의제조및초기수화특성박상진 *, 전세훈, 김경남, 송명신. 강원대학교시멘트생산은 1450 o C의높은열량을필요로하며석회석의탈탄산화반응으로인해많은 CO 2 를배출하여전체 CO 2 배출량의약 7% 를차지하고있다. 시멘트생산과정에서의 CO 2 배출량저감을위한방안으로플라이애시를사용하여시멘트소비량을줄이거나소성온도는낮추는방법이있다. 본연구에서는일반시멘트보다 낮은생성온도에서합성가능한 hauyne 과 belite 의강도특성을융합하여저온소성시멘트를합성하여연구하였다. Hauyne 의조강성과 belite 의장기강도발현특성을이용하여시멘트를대체하여사용가능여부를확인하였다. 본연구는 hauyne 및 belite 의수화특성을확인하기위해시약급을사용하여 hauyne-belite cement 제조를위한소성조건및합성비율을확립하고, 압축강도및 X 선회절분석을통하여생성물확인및생성물수율을검토하고이에따른초기수화거동을확인하였다. G8-1 Application of CFD Simulation on Temperature-gradient CVI Process of Cf /SiC Composite 탄소 / 탄화규소복합체의온도경사화학기상침투에로의전산유체역학시뮬레이션의적용최균 *. 한국세라믹기술원 We have predicted the temperature distributions of the carbon preforms using a computational fluid dynamic (CFD) software. The results of CFD simulation showed good matching with the temperature distribution measured with a thermocouple. From the estimation expected from the CFD simulation, the effects of the process parameters on the density and its distribution in the discshaped specimen were investigated. Lower the pressure and the substrate temperature, higher the density and its uniformity. The temperature of lower part of the disc-shaped specimen was as low as 1000 degree Celsius to suppress the surface reaction that caused the closure of the open porosity. The specimen of 1000 degree Celsius under 10 torr resulted in the density of 72.2% and the standard deviation of 13.9%, while that of 1000 degree Celsius under 50 torr showed the density of 69.1% and the standard deviation of 18.6%. The low density of the specimen was mainly attributed to the large voids between the carbon bundles. G8-2 Modeling of Ferroelectric Domain Structure 강유전체도메인구조의모델링이재욱 *. 재료연구소강유전체의도메인 (domain) 구조는온도, 전기장, 응력등다양한변수에의해변화하고이에따라강유전체의전기적, 기계적특성도달라진다. 때문에도메인의정적, 동적성질을이해하는것은유전체를개발하는연구자들에게중요한관심거리이다. 컴퓨터를이용해도메인의성질및구조를모사해보고자하는시도가다양하게이루어졌으며현재는상장모델링이분자동역학이나몬테카를로방법에비해폭넓게이용되고있다. 아직국내에는강유전체에대한상장모델링기술이널리보급되지않아본연구에서상장모델링의소스코드를직접개발하였다. 개발된코드를이용해 2차원과 3차원의도메인구조, 전기장에의한도메인구조의변화등을살펴보았다. G8-3 Exploring Polymorphism in High-valent Tantalum Trioxides 제1원리전산모사연구 : 탄탈럼삼산화물다형체연구이윤재 *, 김웅천, 이용혁, 손알로이시우스. 연세대학교 Tantalum oxides (TaO, TaO 2, and Ta 2 O 5 ) are key oxide materials for modern electronic devices, such as dynamic random-access memory and sensors [1], possessing the usual +2, +4, and +5 valence charge state of Ta. Interestingly, new forms of (metastable) tantalum oxides have been proposed with an unusual stoichiometry of TaO 3 and are 118 한국세라믹학회

139 구두발표 predicted to have a high-valent charge state of Ta 6+ 2, 3]. However, not much is known about these high-valent metastable TaO 3 nor is the possibility of structural polymorphism (as found in other more wellknown heavy metal oxides like WO 3 and MoO 3 ) explored. In this work, we have collected various polymorphic structural motifs from related oxides of W and Mo while keeping the same stoichiometry of TaO 3. Using first-principles density-functional theory calculations, we study the thermodynamics and lattice dynamics of (meta)stable polymorphs of TaO 3 (namely, the cubic ReO 3, new stacked and sheet structures) and explore the electronic and optical properties of these new TaO 3 polymorphs for potential device applications. [1] C. Chaneliere, J. L. Autran, R. A. B. Devine and B. Balland, Mater. Sci. Eng. R22, 269 (1998) [2] K. Fukuda, I. Nakai, Y. Ebina, R. Ma and T. Sasaki, Inorg. Chem. 46, 4787 (2007) [3] C. Ravi, G. Kaur and A. Bharathi, Comput. Mat. Sci. 90, 177 (2014) G8-4 Quantum-tunneling through the Nanometer-scale Oxide in Ge/GeO 2 /Ge and Si/SiO 2 /Si Structures from First-principles Ge/GeO 2 /Ge과 Si/SiO 2 /Si 구조들에서나노스케일의산화물을통과하는양자터널링에대한제일원리전자수송특성연구고은정 *, Liu Kai, 최정혜. 한국과학기술연구원 Germanium (Ge) is a promising channel material in the Ge-based metal-oxide-semiconductor (MOS) device due to its high intrinsic mobility compared with silicon (Si). One of the key issues to achieve the high performance in MOS devices is the reduction of the gate leakage. By infering from the conventional Si-based MOS structure such as Si/a-SiO 2 /poly-si, we compute tunneling spectra of Ge/a- GeO 2 /Ge, Si/a-SiO 2 /Si, and Si/c-SiO 2 /Si structures by first-principles transport calculations [1], then estimate the tunneling current density [2, 3]. We correct the bandgap of Ge or Si by the LDA+U method. We examine the effects of the oxide phase, the oxide thickness ranging from 0.6 nm to 2.1 nm, the interfacial structure, and the orientation of Ge such as Ge(100), Ge(110), and Ge(111) on the tunneling property. We consider two different interface structures such as the interface with dangling bonds and that passivated with hydrogen atoms, respectively. [1] H. J. Choi, M. L. Cohen, and S. G. Louie, Phys. Rev. B (2007). [2] E. Ko, K.-R. Lee, and H. J. Choi, Phys. Rev. B (2011). [3] E. Ko, K.-R. Lee, and H. J. Choi, Phys. Rev. B 88, (2013). G8-5 Aligning the Band Structures of Polymorphic Molybdenum Oxides and Organic Emitters in Light-Emitting Diodes 몰리브덴산화물동질이상체와 OLED 유기발광체간의전자띠구조정렬연구윤종민 *, 장우선, 이태훈, 이용혁, 손알로이시우스. 연세대학교 Heavy transition-metal oxides are widely studied for key applications in electronics and energy technologies. In cutting-edge organic-lightemitting-diode (OLED) devices, there remain scientific challenges to achieve an efficient transfer of charges between electrodes and the organic layer. Recently, polymorphic MoO 3 has been actively investigated to exploit its unique high work-function values, especially for its use in the electrode buffer layer to effectively transfer the charges in OLED devices. However, no systematic fundamental studies of its electronic structure are available. Thus, in this study, we use first-principles density-functional theory to investigate both the crystal structure and the electronic structure of the MoO 3 polymorphs, and we conclude with a simple perspective to screen the best candidate for OLED applications via a hole transport-barrier descriptor. Phys. Rev. Applied 7, (2017) G8-6 Assembling Phosphorene Flexagons for 2D Electrondensity-guided Nanopatterning and Nanofabrication 밀도범함수법을이용한 Phosphorene Flexagon 형성및 2D 나노패터닝과나노합성에의활용가능성탐구장우선 1*, 강기성 2, 손알로이시우스 1. 1 연세대학교, 2 University of Illinois at Urbana-Champaign To build upon the rich structural diversity in the ever-increasing polymorphic phases of two-dimensional phosphorene, we propose different assembly methods (namely, the bottom-up and topdown approaches) that involve four commonly reported parent phases (i.e. the alpha-, beta-, gamma-, and delta-phosphorene) in combination with the lately reported remarkably low-energy onedimensional defects in alpha-phosphorene. In doing so, we generate various periodically repeated phosphorene patterns in these so-called phosphorene flexagons and present their local electron density (via simulated scanning tunneling microscopy (STM) images). These interesting electron density patterns seen in the flexagons (mimicking symmetry patterns that one may typically see in a kaleidoscope) may assist as potential 2D templates where electron-density-guided nanopatterning and nanofabrication in complex organized nanoarchitectures are important. G8-7 First-principles Study on Mechanical Strain in BiVO 4 BiVO 4 의기계적응력에관한제일원리계산연구최민석 *. 인하대학교 Bismuth vanadate (BiVO 4 ) is promising for photocatalytic application to produce hydrogen fuel from water splitting because of good stability and the moderate band gap (2.4 ev) absorbing visible light. However, this material itself reveals bad efficiency H 2 production, resulting from the lower position of conduction-band edge relative to the H+/H 2 level. As a result, this material is utilized by combining with another oxide (e.g., SrTiO 3 ) or semiconductor (e.g., MoS 2 ) to complement it. In this work, we propose the possibility of band edge tuning via strain for better hydrogen production, through firstprinciples hybrid functional calculation. S81-1 Designing Nanostructures for Phonon Transport Junichiro Shiomi *. The University of Tokyo, Japan Expanding the limits of low and high thermal conductivity of solid materials or realizing the current state-or-art values with other more abundant or multifunctional materials is the key challenge in thermal engineering (management, harvest, and reuse). To this end, recent progresses in material fabrication and characterization at the nanoscale has brought great advance in thermal science to understand the correlation between the lattice heat conduction of semiconductors and insulators and their atomistic structures. With this, now the demand for predicting and designing optimal materials is higher than 한국세라믹학회 119

140 2017 년한국세라믹학회추계연구발표회 ever. In order to overcome the vast parameter space of exploration, it is natural to consider combining thermal science and data science for high throughput screening and optimization of compounds and structures. In this talk, we will introduce some of our recent researches to (1) find crystalline compounds with high or low thermal conductivity by hierarchical screening, and (2) design nano/interfacial structures by coupling phonon transport calculation and optimization method. In (1), the route from the large database of crystal (compound) structures to the small database of thermal conductivity is divide into several steps with database sizes that gradually shrinks. Screening is then performed on each link between the steps differently accounting for the size of the database to enhance the screening efficiency and accuracy. In (2), we developed a framework by alternating between thermal-transport calculations and informaticsbased optimization technique. The results so far demonstrate the effectiveness and advantage of materials informatics in predicting/ designing structures for phonon transport, which can be extended to other transport properties. J. Shiomi, Phonon engineering of nanocrystalline silicon thermoelectrics, APL Materials, 4, (2016). S. Ju, T. Shiga, L. Feng, Z. Hou, K. Tsuda, J. Shiomi, Designing nanostructures for phonon transport via Bayesian optimization, Physical Review X, 7, (2017). T. M. Dieb, S. Ju, K. Yoshizoe, Z. Hou, J. Shiomi, K. Tsuda, MDTS: Automatic complex materials design using Monte Carlo tree search, Science and Technology of Advanced Materials, 18, (2017). S81-2 First-principles Materials by Design for Thermodynamically Stable Low-dimensional Electrides Mina Yoon *. Oak Ridge National Laboratory, USA, University of Tennessee, USA Two-dimensional (2D) electrides, emerging as a new type of layered material whose electrons are confined in interlayer spaces instead of at atomic proximities, are receiving interest for their high performance in various (opto)electronics and catalytic applications. A realization of electrides containing anionic electrons has been a great challenge because of their thermodynamic stability. For example, experimentally, only a couple of layered nitrides and carbides have been identified as 2D electrides. Here, we report new thermodynamically stable lowdimensional (1D and 2D) electrides by using a first-principles global structure optimization method, phonon spectrum analysis, and molecular dynamics simulation. The method was applied to binary compounds consisting of alkaline-earth elements as cations and group VA, VIA, or VIIA nonmetal elements as anions, and further extended to <~100K materials in databases. We demonstrated a new avenue to discover new electrides and provide new design principles, which will significantly boost the discovery of this new class of material with great technical application [1,2]. First-Principles Prediction of Themodynamically Stable Two-Dimensional Electrides, W. Ming, M. Yoon, M.-H. Du, F. Liu, K. Lee, and S. W. Kim, J. Am. Chem. Soc. 138, (2016). New electrides based on one-dimensional building blocks, Changwon Park, Sung Wng Kim, Mina Yoon (2017, submitted to Phys. Rev. Lett.). S81-3 Ensemble Approaches to the Computer Simulation of Site-disordered Solids Ricardo Grau-Crespo *. University of Reading Site-occupancy disorder, defined as the non-periodic occupation of lattice sites in a crystal structure, is a ubiquitous phenomenon in solidstate physics and chemistry. Examples are mineral solid solutions, non-stoichiometric ceramics, and metal alloys. The experimental investigation of these materials using diffraction techniques only provides averaged information of their structure. But many properties of interest in these solids are determined by the local geometry and degree of disorder, which escape an average crystal description, either from experiments or from theory. In this talk, I will introduce a methodology for the computer simulation of site-disordered solids, based on statistical mechanics and the evaluation of properties in configurational ensembles using interatomic potential or quantummechanical methods. The number of occupancy configurations can be greatly reduced by taking advantage of the crystal symmetry of the lattice, and thermodynamics properties can then be defined statistically from the energies of the configurations in the symmetryadapted ensemble. Furthermore, by using interatomic potentials or quantum mechanical calculations to calculate each configuration in the ensemble, we can go beyond thermodynamics and evaluate the effective values of other observables in the disordered solid, from geometric to spectral properties. I will briefly discuss some recent applications of this type of methodology to materials with applications in catalysis and energy. S81-4 First Principles Study of Spin Small Bipolaron in TiO 2 TiO 2 에서스핀바이폴라론에대한제일원리연구이동헌 1*, 한승우 1, 남호현 2. 1 서울대학교, 2 KAIST Bipolaron is a paired-polaron quasiparticle that often explains novel electrical and optical phenomena in solids. However, despite its widespread significance, there is a lack of theoretical study on the bipolaron model in real-level accuracy such as first-principles approach. Here we report that the spin-spin exchange interaction can lead to the formation of spin-singlet small bipolaron near impurity in non-magnetic d 0 oxides. In the prototypical TiO 2, we find that small bipolaron near a substitutional hydrogen is not formed in the anatase but is stably formed in the rutile due to antiferromagnetic exchange interaction between two Ti 3+ species bound to the hydrogen. It has been found that this bound small bipolaron is also available in other oxides such as HfO 2, as well as other defects such as oxygen vacancy and substitutional fluorine. Our work shows that small bipolaron generated when excess electrons are doped or excited in d 0 oxide can provide a new pathway to understand the distinctive electrical and optical properties of the oxide. S81-5 Computational Analysis for the Development of Highly Stable and Efficient Perovskite Solar Cells 유무기복합페로브스카이트태양전지의고효율과안정성확보를위한전산해석홍기하 *. 한밭대학교 Organic-inorganic hybrid perovskites (OIPVKs) have emerged as strong candidates for the low cost and high-efficient thin film photovoltaic absorber materials. The stability of OIPVKs is the most 120 한국세라믹학회

141 구두발표 important issue for the commercialization. Highly stable solar cells can be made with the strong materials which have resistance against heat, light, and humidity. As the material properties of OIPVKs can be easily manipulated by changing chemical constituents of perovskites, there have been numerous OIPVK varieties. Computational analysis and screening procedure can be an effective tool to find the potential candidates for the stable perovskite light absorbers. Here I will present theoretical analysis to find more stable organic-inorganic hybrid perovskite. Firstly, the physical origin of compositional engineering is addressed in terms of anti-stabilizer concept. Secondly, materials screening for Pb-free perovskites is presented focusing on tri-valent metal halide perovskites (A3X2I9, A=CH3NH3+(MA)/Cs, X=Bi/ Sb). S81-6 Reliability and Transferability of Neural Network Interatomic Potential in Perspective of Training-set Sampling Density 트레이닝세트샘플링밀도관점에서본원자간인공신경망포텐셜의신뢰성과범용성한승우 *, 정원석, 이규현, 유동선. 서울대학교 While the density functional theory (DFT) provides highly accurate information about material properties, its application is still limited to a few ps molecular-dynamics (MD) simulations with up to several hundred atoms. With classical force fields, one can handle much larger systems and several ns. However, the accuracy of classical MD critically depends on the interatomic potentials and optimizing the parameters in the force field requires strenuous efforts. Recently, neural-network potential (NNP) are gaining much attention. NNP is constructed through the machine learning on the reference ab initio data. Since NNP can provide promising models for the arbitrary functional forms, it gives interatomic potential that shows accuracy comparable to DFT. However, the reliability and transferability of the NNP is an open question. Furthermore, most of the previous works are focused on bulk or molecule systems. In the first part of this presentation, we introduce in-house NNP generation and MD simulation package named SNU Neural-network Atomic Potential Package (SNAPP). Next, we suggest a novel indicator called Gaussian-density function (GDF) that can notify when the simulation is likely to fail. Using GDF, one can test the reliability and transferability of given NNP. Finally, we apply GDF to overcome the bulk-biasing problem that arises when NNP is trained for defective systems. This is achieved by tunable force weighting which gives extra weights determined by sampling density of each atomic environment. S81-7 Defects in Functional Oxides 기능성산화물에서의결함이재찬 *, 엄기태, M. Rahman. 성균관대학교 Defects introduced into a material in an intrinsic or extrinsic way result in a wide variety of functionality in the material. We have studied an intrinsic defect such as oxygen vacancy, and extrinsic defects such as La and Pr in transition metal oxide, SrTiO 3, and rare earth metal oxide, CeO 2. It is well known from several studies that the oxygen vacancies can be singly ionized. However, the first-principles study shows that the oxygen vacancies cluster in a linear way, accompanied by electron localization, which successfully explains several phenomena including the decrease in the carrier density and photoluminescence in oxygen deficient SrTiO 3. Electron doping was also studied in La:SrTiO 3 thin films where the film thickness was varied down to a few unit cells. Large electron-lattice coupling is obtained along with anomalously large tetragonal distortion, which is sensitively influenced by the in-plane strain imposed to the thin films. The first-principles calculation proposes ferromagnetism in oxygen deficient CeO 2, doped with multivalent Pr. Various aspects of chemical doping toward functionality of oxides are presented in this study. S81-8 First-principles Studies on the Fundamental Mechanisms of CO 2 Conversion into Hydrocarbon Fuels Dong Yun Shin, Chang-Mi Lee, Jeong An Kwon, and Dong-Hee Lim *. Chungbuk National University The conversion of carbon dioxide (CO 2 ) into usable hydrocarbon fuels is important for recycling carbon resources and mitigating environmental problems. However, converting CO 2, which is a stable compound, requires a high additional energy. Therefore, it is essential to understand the electrochemical reduction mechanisms of CO 2 and develop more efficient catalysts. In the current study, the conversion of CO 2 into methane (CH 4 ) on copper (Cu)-based catalysts (flat surfaces, Cu nanoclusters (NCs), and graphite-supported single Cu atom) were investigated to understand the fundamental mechanism of CO 2 reduction, and to suggest a key factor for designing promising catalysts for CO 2 conversion into hydrocarbon fuels. The density functional theory (DFT) calculations revealed the lowest-energy reaction pathways on Cu(100), Cu(110), and Cu(111) planes, and determined that the potential limiting step for CO 2 reduction lies between the reaction intermediates CO* and CHO* (* denotes the state adsorbed on the catalyst surface). The energy barrier to the potential limiting step on Cu surfaces is lowered in the following order: Cu(110) < Cu(100) < Cu(111). A key factor for obtaining the lowest energy barrier on Cu(110) may be the largest interatomic distance on the Cu(110) surface among the three surfaces, which enhances the interaction between the key intermediate CHO and the Cu surface, compared to that between CO and the surface. This finding may be applied to developing promising catalysts for CO 2 reduction by designing a Cu thin film on a supporting material with larger lattice constant than Cu. The potential-limiting steps with the energy barrier on the Cu 13 NCs (0.64 ev), Cu 55 NCs (0.83 ev), and Cu(111) surface (0.86 ev) also lie in the CO* CHO* step. The formation of an adsorbed CHO intermediate depending on the NC surface geometry may significantly influence the energy barrier. Also, the CO 2 reduction on the graphite-supported single Cu atom appeared to be a more favorable reaction to methanol (CH 3 OH) production than CH 4 production. Details of electronic property analyses of the investigated systems were conducted such as the density of states, charge density difference, and highest occupied molecular orbital and lowest unoccupied molecular orbital band gap. S81-9 Developing Neural Network Interatomic Potential and Tunable Force Weighting for Defective Systems 원자간인공신경망포텐셜개발과결함계시뮬레이션을위한조정가능포스가중치함수의활용 한국세라믹학회 121

142 2017 년한국세라믹학회추계연구발표회 정원석 *, 이규현, 유동선, 한승우. 서울대학교 Recently machine learning (ML) interatomic potentials are gaining much attention as the next generation classical force field. Among the ML potentials, neural network based potential (NNP) with symmetry function descriptor has been demonstrated to be successful for describing potential energy surfaces (PESs) of given atomic system. In principle ML potentials can be applied to any kind of material systems for it has no fixed function form and it has high flexibility to learn from the given ab initio data. Since the early work of Behler et al. on phase transition of bulk Si phases, 1 numerous groups have developed and published NNP works for various systems. However, most of the previous works are focused on bulk solid systems or molecule systems. In this presentation we extend the usage of NNP to defective systems such as bulk with a point defect, surface slabs and address the problem that arises when NNP simulation is applied on defective systems. When comprising a training set for defective solid systems, most of the atoms fall in the position of bulk-like conditions. Thus most of fitting capability of NNP is used on the bulk part of the training set and the fitting error converge on defect atoms. As a consequence, NNP struggles from describing PES of non-bulk-like atoms. To solve the bulk-biasing problem we suggest tunable force weighting which gives extra weights on force term in the loss function. The weights are determined by sampling density of each atomic environment. [1] Behler et al. PRL 98, (2007) S81-10 Machine Learning for Crystalline Interface Teruyasu Mizoguchi 1,2*. 1 University of Tokyo, Japan, 2 JST-PRESTO, Japan Interface plays crucial roles of materials properties. The big influence of the interface to the materials properties is caused by its different atomic structure from inside bulk. Determining the central structures at the interface for bringing about the properties and understanding the structure-property relationship are thus one of the most significant task in the materials science. However, the determination of the interface structure is always challenging because of the geometrical freedoms of the interface. Here, we demonstrate powerful approaches for unveiling the structure of the interface with an aid of machine learning. In my presentation, I am going to introduce two machine learning methods based on Bayesian optimization and virtual screening. Furthermore, the structure-property relationship of crystalline interface will be touched. [Ref] S. Kiyohara et al., Science Adv. (2016), Jpn. J. Appl. Phys. (2016). S81-11 Ab-initio Study of MoS 2 p-n Junction and Application as a Hydrogen Evolution Reaction Catalyst 제일원리계산을통한 MoS 2 p-n 접합구조의이론적연구와수소생성반응촉매로서의활용방안강성우 *, 한승우. 서울대학교 For decades, there have been many efforts to store energy into H 2 by water splitting hydrogen evolution reaction (HER). There requires additional bias to equilibrium voltage, which is called overpotential, should be provided to obtain enough current. Therefore, the efficiency of HER significantly depends on the catalytic material. Recently, transition-metal dichalcogenides (TMDs), especially MoS 2, have been considered as a promising candidate for HER. One attempt was made to reduce the overpotential by transferring n-mos 2 on p-type Si [1]. The overpotential was reduced by the built-in potential developed between Si and MoS 2. In this presentation, we theoretically investigate the electronic structures of MoS 2 p-n junction and explore its potential applications as HER catalysts. We investigate the charge distribution and electronic structure, and build a simple model to understand the physics of 2- dimensional p-n junctions. In addition, we examine the possibility of lowering overpotential by built-in potential developed across the p-n junction. We demonstrate that built-in potential in experimental doping limit may significantly increase the catalytic performance. We also find that the band gaps of vertical TMD p-n junctions transform from indirect to direct by doping, which could be utilized for optoelectronic applications. [1] Kwon, Ki Chang, et al. Energy & Environmental Science 9.7 (2016): S81-12 Discovery of New Allotrope of Silicon (Si 24 ) Using High- Pressure Technique: Computational Prediction and Experimental Synthesis 새로운실리콘구조 (Si 24 ) 의발견및응용가능성에대한연구김덕영 *. 포항공과대학교 Silicon is a backbone element of contemporary semiconductor technology. Diamond structured silicon (d-si) is the stable form at ambient conditions and its allotropes have been studied in broad range of pressure-temperature conditions. Despite lots of efforts to find another form, there are only a few known allotropes of silicon at ambient conditions, compared with abundant meta-stable forms of carbon, which prevents silicon from being next generation energy platform. In this presentation, we show our recently discovered new allotrope of silicon, synthesized using a high-pressure technique, guided by our computational prediction. Starting from a high-pressure precursor Na 4 Si 24, we discovered Si 24 by evaporating sodium atoms [1]. It possesses an open framework structure with 1.3 ev quasi-direct band-gap, which is regarded as an optimal bandgap for photovoltaics. We will present possible application of Si 24 using computational study and report further progress [2-3]. [1] D. Y. Kim, S. Stefanoski, O. Kurakevych, T. Strobel, Synthesis of an open-framework allotrope of silicon, Nature Materials (2015) [2] Z. Zhao, H. Zhang, D. Y. Kim, W. Hu, E. S. Bullock, T. A. Strobel, Properties of Exotic Metastable Ge: The case of ST12, Nature comm (2017) [3] X. Tong, X. Xu, B. Fultz, H. Zhang, T. A. Strobel, D. Y. Kim, Phonons in Si 24 at simultaneously elevated temperature and pressure, Phys. Rev. B (2017) G9-1 Synthesis of Indium Hydroxide Powders by a Precipitation Method and Crystal Growth Behavior 침전법을이용한 Indium hydroxide 분말의합성및결정성장거동최은경 1*, 심광보 1, 김응수 2, 조우석 2. 1 한양대학교, 2 한국세라믹기술원 122 한국세라믹학회

143 구두발표 고밀도 ITO 타겟제조를위해입자의크기가미세하면서도응집성이적은 In 2 O 3 분말을합성해야한다. 본실험에서는 In 2 O 3 분말의특성에영향을미치는전구체 Indium hydroxide 분말의크기와형상을제어하는것에목적을두고있다. 출발물질로써 Indium metal 을질산 (HNO 3 ) 과증류수의혼합용액에용해시켜 In(NO 3 ) 3 용액을만들었다. 침전제로수산화암모늄 (NH 4 OH) 을사용하여농도, ph, 온도가 Indium hydroxide 특성에미치는영향을분석하였다. X-ray diffraction 으로각시료의결정상을분석하고 Crystallite size 를계산하였으며, TEM 으로입자의형상과크기를분석하였다. 그결과 In(NO 3 ) 3 농도가증가할수록얻어지는 Indium hydroxide 의입자크기는증가하였고일정한농도의 In(NO 3 ) 3 용액에서침전 ph 변화에따른 Indium hydroxide 의입자크기와형상의변화는관찰되지않았다. 침전시온도가상승할수록입자크기는증가하였다. G9-2 Evaluation and Verification of Color Management System in Digital Ceramic Printing 디지털세라믹프린팅의색채관리평가및검증노형구 *, 김응수, 조우석. 한국세라믹기술원본연구는세라믹타일제조공정에서디지털세라믹프린터의효율적인운영을위해잉크출력밀도를제어하여컬러재현평가와검증을실시하였다. 디지털세라믹프린팅에사용하는액상잉크를분리 건조하여분말상태로안료를분석하였다. 디지털세라믹프린팅의색채관리를위해잉크채널구축 (Creat a New Mode), 잉크제한 (Ink Restriction), 잉크선형화 (Linearization), 잉크혼합농도제한 (Ink Limit) 단계를통해출력한세라믹팔레트의반사율을측정하고, 잉크포화도, 잉크출력밀도및볼륨값을연산하여최적의프로파일을구축하였다. 디지털세라믹프린팅의경우고온열처리공정에서의발색안정성과생산비용을고려하여 Blue, Hot- Pink, Yellow, Black 잉크로 4채널로구축하였다. 최적의잉크출력밀도는 Blue 잉크에서 1.19 g/cm -3 와 Black 잉크에서 1.27 g/cm -3 로나타났으며, Hot-Pink 잉크에서 0.78 g/cm -3 과 Yellow 잉크에서 0.57 g/cm -3 로교정장치에서제시하였다. 최적의프로파일을적용한색공간범위를평가및검증결과, 안정적인컬러와색역확장을확인할수있었지만 Green, Red, Purple, Orange 혼합색에서탁한톤의낮은채도를나타냈다. 이를위해출력이미지의컬러와톤을고려하여프로파일을구축하거나표준별색을적용한색역을확장하여야할것으로판단되었다. G9-3 Materials and Process Development for Manufacturing Porcelain figures by a Powder Bed Type 3D Printer Powder bed 방식의 3D 프린터를이용한도자기조형물제조기술개발최정훈 1*, 김응수 2, 조우석 2. 1 경상대학교, 2 한국세라믹기술원본연구에서는기존의점토-장석-규석기반의도자기원료를보완하여 binder jetting 방식의 3D Printer에사용할수있는원료를개발하였고이를이용하여 porcelain figure 를조형하고시유하여최종제품을완성하였다. Binder jetting type의 3D printing 기술은분말을뿌려 layer를형성하고그위에 binder 용액을분사하여경화하는과정을반복하여기물을조형한다. 우선적으로 Porcelain figure 를제조하기위해서는소결후 mullite, quartz, glassy phase 등으로구성된 body를형성하기위해점토, 장석, 규석등의원료를적정비율로조합하여야한다. Layer를형성하는분말을준비할때조성뿐만아니라입자형상과크기, 흐름성, 충진밀도등분말의특성을고려하여야한다. Binder 용액은적정한시간안에 powder bed 안으로스며들어분말들간의 link를형성하고건조후 에는다음단계로의 handling 이가능하도록성형강도를유지하여야한다. 이를위해 binder 용액과반응하여경화를촉진하고성형강도를증진시키는보조물질을첨가하였다. 분말형상은구형에가까울수록흐름성과충진밀도가증가하게된다. 입자크기는커질수록흐름성은증가하는반면에충진밀도는감소하게된다. 그러므로조성과더불어사용되는분말들의형상및물성을최적화하였다. 이전체의과정을제품의디지털스케치, powder bed 원료의최적화, porcelain figure 의성형과소결단계로나누어단계별로고려되어야할점들에대해논의하였다. G9-4 Printability of Digital Color Ceramic Ink on Glazed Surface of Inkjet-Printed Ceramic Tiles 잉크젯프린팅도자타일의유약표면에서세라믹잉크의유약표면인쇄적성평가김진호 *, 한규성. 한국세라믹기술원 1000C 이상의고온에서도안정적인발색특성을보이는세라믹잉크를활용한디지털프린팅기술은우수한내구성을가지는제품을다양한디자인을적용하여생산할수있는친환경공정이라는장점으로인해최근관심이높아지고있다. 특히건축용세라믹타일산업에서잉크젯프린팅기술도입을통한디지털공정으로의전환은점점가속화되고있으며, 이와관련된프린팅시스템및고온발색세라믹잉크에관한연구가활발히진행되고있다. 본연구에서는세라믹타일의표면유약층에서고온발색세라믹잉크의인쇄적성을분석하였다. 디지털 4원색인 Cyan, Magenta, Yellow, Black 색상의고온발색세라믹잉크가프린팅된세라믹타일의표면및단면의미세구조를분석함으로써세라믹잉크의종류에따른인쇄특성에대해비교하였다. 또한고온열처리공정이필수적으로요구되는세라믹소재의특성상잉크젯프린팅후세라믹잉크패턴의열처리공정에따른거동변화에관하여고찰하였으며, 세라믹타일유약층에서세라믹잉크의인쇄적성은미세구조및고온소성과정에큰영향을받고있음을확인하였다. G9-5 Effect of Glaze Chemical Compositions on Chemical Strengthening 유약화학조성이화학강화에미치는영향김형준 1*, 최재호 1, 박형빈 1, 나혜인 1, 김기수 2, 한윤수 1. 1 한국세라믹기술원, 2 한국도자기 We investigated the effect of glaze chemical compositions on chemical strengthening. The glaze was designed with Na 2 O-Al 2 O 3 - SiO 2 (NAS) ternary system for the bone china. Bone china coated with NAS glaze was treated with KNO3 molten salts from 420 o C to 510 o C. Fabricated specimens were evaluated to hardness, depth of layer (DOL), scratch resistant test and compressive residual stress. NAS glaze coated bone china was improved hardness approximately 40% than commercial product. Tendency above evaluation items and reason for the NAS glaze more effective than that of commercial product were explained in this presentation. SS2-1 컴퓨터, 산학연을바꾸다이준근 *. 한국과학기술연구원우리의생활은알게모르게수많은컴퓨터로운영, 지원, 또는감시되고있다. 아버지의금융포트폴리오관리, 어머니의쇼핑, 아이들의공주구하기게임등이좋은예이다. 뿐만아니라테러등각종범죄의예방및수사등도컴퓨터의도움없이는불가능한일이다. 산학연에서도예외는아니다. 컴퓨터가 4차산업혁명의중 한국세라믹학회 123

144 2017 년한국세라믹학회추계연구발표회 심에서있고, 각종컴퓨터시뮬레이션이학문의진보에핵심적역할을하고있다. 산업계에서컴퓨터의역할은차세대산업혁명인생각하는공장 Smart Factory 로대변될수있다. 이것은무선인터넷, Cloud computing, robot, 사물인터넷 (Internet of Things, IoT), Big data, 사물이지능적으로제어되는인공지능등을모두연계시킨것이다. 이를통해가상제조와실제제조의병행이현실화되고시행착오와불량품의완전제거, 제한없는주문제작등을가능케한다. 한국의제조업혁신 3.0, 독일의 Industry 4.0, 중국의 Made in China 2025, 미국의 NITRD/SmartAmerica Challenge, 일본의스마트제조이니셔티브등이그좋은추진프로젝트의예이다. SS2-2 한국세라믹산업발전을위한산 학 연협력 -세라믹소재상용화촉진생태계조성사업- 김광진 *. 전남테크노파크전남테크노파크세라믹산업종합지원센터는산업부로부터지원받은비산화물세라믹인프라구축 (5개년 ) 과, 세라믹원료소재상용화인프라구축사업 (5개년 ) 을 2016년말에완료하면서, 제품상용화, 시제품제작을위한장비약 80여종을일괄구축했다. 더물어전라남도는세라믹산업을지역진흥산업으로지정, 전남도내의세라믹기업을대상으로 R&D 및비R&D로구분기업지원을다년간해오고있다. 그결과전남도내전통세라믹기업수 311개사, 종엄원수 2479명, 매출 4571억원 ( 인당매출액 1.8억원 ) 대비첨단세라믹기업수 44개사, 종업원수 2058명, 매출 9300억원으로, 산업구조고도화를실현시켰고, 전통세라믹기업은수출을향상시켰고, 첨단세라믹기업을집적화시켜산업구조고도화를실현시켰다. 아울러목포시는센터를중심으로 세라믹산업일반산업단지 를 116,455 m 2 (35천평) 조성하여분양중에있으며, 첨단세라믹기업집적화를위해산단투자비도지원하고있다. 현재 3개기업이세라믹분말공장을건설하였다. 당센터는구축된인프라를활용하여, 세라믹사업화 / 상용화를지원하기위해 세라믹소재상용화촉진생태계조성사업 을수행하고있는데, 최상의성과를얻고자, 전국적으로산학연협력네트워크를강화하고있다. 즉, 대학이나연구소의좋은연구결과를상용화 / 사업화하기위한시험생산라인을기업과당센터가공동으로구성운영하여시생산을하면서, 시제품제조, 엔지니어링을통해양산조건을확립한후양산설계 / 엔지니어링, 고객사승인까지의모든단계를지원, 기업이해당제품의상용화 / 사업화를꼭성공하도록지원해주고있다. SS2-3 동아시아경제공동체형성과국제산학연협력임대영 *. 배재대학교최근국제화는세계화와지역화의흐름으로진행되고있고, EU나 NAFTA 와같이지역간, 국가간경제블록화에서경제통합으로진행되어큰시장을형성하고있다. 이에대응하기위한한국을포함한아시아국가들은아시아적가치를발견하고아시아경제공동체구축에적극대응해야하는매우중요한시기이다. 한국을비롯한동아시아의 3국 ( 한국, 중국, 일본 ) 은 3국간의협력인 한중일환황해경제기술교류회의 를통한협력뿐만아니라 ASEAN과협력하여소위 ASEAN+3의아시아경제공동체구축을하려는노력을하고있다. 한국은세계의추세에대응하기위하여아시아국가간종합적인산학연연계의경제협력모델창출을적극적으로수행해야한다. 한국이다가오는아시아시대를대응하기위한한중일 3국이모두만족할만한산학관협력방향과사업을제시하여야하고한- 일, 한 - 중양국간사업을시작하여, 점차적으로한 - 중 - 일 3 국간종합적인산학연사업을전개해야된다. 그구체적인방법으로한국중소기업의경쟁력강화를위한러시아노보시비르스크의원천기술이전과한인미국교수, 재일교포기술자등자신이개발한특허와기술개발경험을활용하여선진기술이전을실시함. 국제공동과제를수행하는국내대학원생을대상으로국제공동과제를수행하고있는선진대학및연구기관에파견시킨후해당국내중소기업연구개발요원으로취업으로유도하는인력양성이필요하다. 아시아개도국기술확산연구를진행하여인도차이나반도국가등새로운시장을확보하고, 이지역내한국과학기술의영향력을확산시키기위하여국내기업의기술및경영노하우의전수하고, 전문가를파견한다. 이러한국제산학연협력을통하여자유로운아시아, 잘사는아시아, 친구되는아시아를지향하는신아시아산학관협력으로발전시킬수있는지혜와경험을나눈다. SS2-4 Characteristics of Thermal Spray Coating Powders by Plasma Treatment 플라즈마를이용한세라믹용사분말처리에따른특성변화문흥수 1*, 박새미 1, 천세민 2. 1 ( 주 ) 세원하드페이싱, 2 국가핵융합연구소세라믹용사코팅분야에서는치밀한코팅막이요구되고있고, 치밀한용사코팅막을위해서는입자의빠른속도와, 작은용사분말로해결할수있다. 그러나, 용사분말이작아질때큰입자에서영향이적은반데발스인력으로인해분말이응집되어상용적용이어렵다. 이를해결하기위하여미세한분말을서스펜션 (suspension) 화하고이를이용하여 Suspension plasma spray (SPS) 코팅방식으로치밀한코팅막구현에많은연구가진행되고있다. 본연구는용사분말을미세화하고분말표면거칠기와반데발스인력을극복할수있는다양한방법을시도하였으며, 표면개질에따른용사분말특성과대기플라즈마 (Atmospheric plasma spray, APS) 에표면개질된용사분말을적용하여치밀한코팅막구현에관하여연구하였다. SS2-5 세라믹산업육성을위한한국세라믹기술원의역할 -과거의발자취, 현재의모습, 미래의역할- 이명현 *. 한국세라믹기술원한국세라믹기술원은 100여년의전통과역사를가진세라믹전문연구기관으로서그동안세라믹산업발전의중심에서중요한역할을수행해왔다. 1912년중앙시험소에요업부를신설하면서부터 2009년한국세라믹기술원으로독립하여현재에이르기까지세라믹산업의역사와함께호흡해왔다고볼수있다. 이에한국세라믹기술원의과거발자취와현재의모습을먼저고찰해봄으로써세라믹산업육성을위해한국세라믹기술원이담당했던역할과그성과들을살펴볼것이다. 그리고 4차산업혁명과더불어미래환경패러다임의변화등국내외급속한환경변화속에서한국세라믹기술원이세라믹산업을육성하고선도하는데어떠한역할을수행해야할것인지에대한방향성도제시해보고자한다. SS2-6 How Can Micro TiO 2 and Nano TiO 2 Link Together to Form a Hybrid TiO 2 조현대 *. 코스메카코리아 *OBJECTIVE: This research paper demonstrates how micro TiO 2 and nano TiO 2 can link together to form a hybrid TiO 2. The use of this 124 한국세라믹학회

145 구두발표 hybrid product reduces irritation and has more UV protection than normal sunscreen products. *Methods: To find out the best condition of combining two different types of TiO 2,which are micro and nano TiO 2, a ratio between AlCl 3 and nano TiO 2 is controlled. The main formulation of this mixture provides a more powerful SPF rating. *Results: The hybrid and AlCl 3 compound, when coated together at a.3% ~.5% ratios, created the most uniform pigment. The best compound to coat the materials at is an AlCl 3 level of 0.4%, and a 1:2 ratio of micro TiO 2 to nano TiO 2. When this compound is formulated into a BB cream, then there is a high level of improvement in SPF and PA, with the SPF level at 33.8% higher, and the PA level at 24.5% higher. *CONCLUSION: AlCl 3 and inorganic pigment hybrid compound (micro and nano TiO 2 ) coated together in an ultraviolet protection product creates an SPF and PA synergy effect. SS3-1 Status of ISO/TC206 Fine Ceramics Shuji SAKAGUCHI *. National Institute of Advanced Industrial Science and Technology, Japan: Secretary ISO/TC206 ISO/TC206 is a technical committee (TC) in ISO for fine ceramics (means advanced ceramics) established in We already have 97 published ISO standards in this field, and 37 items under discussion for new standards. Actively participating countries are 15, and the observer countries of 16 are the members of this TC. We have 12 working groups for the discussing categories for the wide range of the field for ceramics, not only for the materials itself but for some applications. In the presentation, I will report the discussion results in the plenary meeting of this year, that was held in Italy in July More than 20 years have passed since the establishment of this TC, the proposed items tend to shift, from for the measurements of some basic properties of monolithic ceramics (mechanical and thermal properties) to some typical applications (photocatalysis, ceramic bearings, composites, etc.). SS3-2 Activities on Composite Working Group in ISO/TC 206 국제표준화기구 (ISO) 파인세라믹스기술위원회 (TC206) 섬유강화복합체전문가그룹활동박지연 *. 한국원자력연구원고온기계적특성, 파괴인성및내환경성이우수한소재인 SiCf/ SiC 복합체와같은섬유강화세라믹복합체 (CMC) 항공우주원자력등의극한환경용차세대구조재료로고려되고있다. 소재가개발되어부품으로적용되려면설계자들이활용할수있는소재관련신뢰성이확보된물성성능정보가요구되며이를토대로설계코드를개발할수있게된다. 소재물성의신뢰성을확보하는방법의핵심요소가평가절차의표준화다. 따라서각국은자국의표준뿐만아니라국제협력을통한국제표준절차제정에많은노력을기울이고있다. ASTM, DIN, JIS, AFNOR, KS, ISO 등이그예들이다. 국제표준화기구 (ISO) 에서는산하에분야별로기술위원회 (Technical Committee : TC) 를조직하고, 기술위원회산하에소재나주제별로전문가그룹 ( 작업반, working group : WG) 을두고그룹별로평가절차제정을수행하고있다. 국제표준화기구의파인세라믹기술위원회인 ISO/TC 206 산하에는 12개의전문가그룹들이구성되어있으며, 그룹별로국제표준을검토 / 제안 / 제정하고있다. WG04 는복합체전문가그룹이며, 특히섬유강화 복합체에초점을맞추어국제표준제정에대한역할을수행하고있다. 본발표에서에대한활동과관련국제표준화현황을소개하고자한다. SS3-3 Test Method on Performance of Visible Light Responding (VLR) Photocatalyst Using FTIR ; TCE Tai Kyu Lee *. NANOPAC Co Ltd ISO/TC 206 'Fine ceramics' decides to take a role to establish standards with cooperation of experts and industries by forming Working Group 9 to deal with International Standardization of Photocatalysis. 15 standards on UV responding (UVR) photocatalysis have been published since active discussion was begun in Now much more attention to standardization on visible light responding (VLR) photocatalysis has been gathered not only from scientists but also from industry sectors because of closer real application than UVR photocatalysis. As of 2016, 4 standards have been published and 7 items for visible standards are under discussion. In this presentation, performance test method of VLR photocatalysis of TCE using an insitu FTIR reactor is introduced. Blue LED (Main peak ; 164 μw/cm 2 at λ = 472 nm) and True Violet LED (λ = nm) are used as a light source of visible light, and homemade ON doped TiO 2 photocatalyst has been prepared. This test method expects to be discussed in CASP meeting in Danang and in NEAS Forum in Through close collaboration with Japanese experts and Chinese experts eventually this item will be proposed to ISO/TC206 for IS discussion. SS3-4 Ultraviolet Photoluminescence Imaging for Polytype Analysis in the Conductive SiC Crystals 자외선유도발광이미지분석에의한 SiC 단결정의폴리타입평가의표준화최형석 *, 윤지영, 정성민. 한국세라믹기술원 Silicon carbide (SiC), which has a closed packed crystal structure, is a promising wide bandgap (WBG) material applicable to laser diodes (LDs)/light emitting diodes (LEDs) or power electronic devices. During crystal growth, many types of stacking order of SiC can occur within the bulk of a single sample due to temperature fluctuations in the sample, and these different types of stacking order are called polytypes. Polytypes have identical closed-packed planes, but differ in the stacking sequence in the third axis perpendicular to these planes. These polytypes of SiC have the same density and Gibbs free energy, but different electronic band structures. The differences in band structures cause emitted luminescence to have different wavelengths when ultraviolet (UV) light is incident on the SiC. SiC can be grown using several crystal growth techniques such as physical vapor deposition (PVD), high temperature chemical vapor deposition (HT- CVD), top seeded solution growth (TSSG), etc. In the production process, polytype inclusion generation is one of the drawbacks of bulk SiC. Therefore, a rapid test method to discriminate polytypes is important for mass production of SiC crystals. This presentation introduce the research and standardization process of the test method to evaluate the polytypes of SiC by ultraviolet induced photoluminescence measurement using non-contact and full-field measurement techniques. 한국세라믹학회 125

146 2017 년한국세라믹학회추계연구발표회 SS3-5 Standardization of Test Methods for Ceramic Materials in Additive Manufacturing 3D 프린팅용세라믹소재평가방법국제표준화현황최기인 *. 한국세라믹기술원 3D 프린팅기술발전및구현가능소재의다양화로인해, 3D 프린팅시장지배력은과거프린터개발기술중심에서 3D 프린팅에활용될수있는신소재개발중심으로옮겨가고있다. 현재까지는저가로대량공급이가능한고분자 ( 플라스틱 ) 소재가 3D 프린팅소재시장을주도해왔으나, 최근금속분말, 합금소재, 세라믹소재, 융 복합신소재등이전까지 3D 프린팅산업에서충분히활용되지못했던고부가가치소재에대한연구개발이가속화되면서 3D 프린팅용신소재시장규모는더욱커지고있으며, 이에 3D 프린팅용신소재관련표준주도권선점을위한선진각국의경쟁역시더욱치열해질것으로예상된다. 본발표에서는 3D 프린팅용세라믹소재평가를위한국제표준화현황을살펴보는한편, 향후 3D 프린팅산업동향과연계한세라믹소재표준화방안을모색해보고자한다. SS3-6 Test Method for Crystalline Quality of Gallium Nitride (GaN) Single Crystal using High Resolution XRD 고분해능 XRD를이용한 GaN 단결정박막의결정성품질시험방법표준화이선홍 *. 한국세라믹기술원 Gallium Nitride (GaN) is a most useful semiconductor for applications requiring high temperature, high power and high frequency (wide bandgap, high thermal conductivity, high breakdown field and high saturation velocity). Its potential has been known for many years, but a lack of high quality material has greatly delayed development of GaN devices. Substrate diameters have been steadily increasing since the commercial introduction of substrates in 1991 and crystal defects have been greatly reduced in the past 10 years. Commercial devices are available, but their widespread use will depend on the ability of growers to make large, inexpensive, defect free materials available. While various methods for measuring the defect of GaN thin film have been presented until now, the most typical method for measuring the crystallinity (degree of average defect) of single crystal thin films that have wide area (2 inch, 4 inch etc.) is HR-XRD. However, this method can easily create a great error margin as the result value is analysed to be very different depending on the measuring process and conditions of the user or the pretreatment of sample, etc. Therefore, a standard on universal measurement methods and conditions is absolutely necessary. This standard is the one for measuring the crystallinity of GaN single crystal using HR-XRD analyzer. Epi or bulk GaN wafer with AlGaN and InGaN crystal structure is included in the scope of this standard. SS3-7 Methods for Chemical Analysis of High Purity Barium Titanate Powders 타이타늄산바륨분말의화학분석방법표준화이명규 *. 한국세라믹기술원전기 전자산업분야에서기능성세라믹소재로사용되고있는타이타늄산바륨 (Barium titanate; BaTiO 3 ) 은압전, 유전율이뛰어나다양한전자부품의중요한원료로사용되고있다. 또한, 최근제품의물성이나전기적특성변화를주기위하여타이타늄산바륨에이트리아 (Y 2 O 3 ), 실리카 (SiO 2 ) 등의첨가제를주입하기도하며, 세륨 (Ce), 니오븀 (Nb) 등을가하여반도체로사용하기도한다. 첨가제가극미량이라하더라도타이타늄산바륨의물성과전기적특성은크게달라지기때문에, 제품의품질관리를위해서는주원료인바륨과티타늄의순도확인은물론조제된타이타늄산바륨에존재하는불순물이나첨가제의목적으로주입한원소의함유량을정확히분석하는것이매우중요하다. 타이타늄산바륨의주요원소및미량원소에대한화학분석방법은아직까지국제표준으로제정된사례가없으며, 이러한국제적으로표준화된시험방법의부재는해당원료나제품에대한신뢰성저하와연결되고이러한문제점들을해결하기위하여해당소재에대한화학분석방법표준화를진행하고자한다. SS3-8 Test Method for Total Conductivity Measurement of Conductive Fine Ceramics 전도성파인세라믹스의전기전도도측정방법김수연 1*, 류지승 1, 신태호 2, 김용남 3, 이희수 1. 1 부산대학교, 2 한국세라믹기술원, 3 한국산업기술시험원 A 4-probe method is the most popular method for measuring the conductivity of conductive ceramics, which have ionic or electronic conduction. This method is able to solve the problems of 2-probe method that the measurement of the ionic conductivity is not available and the error values of contact resistance are significant. However, the precision and compatibility of data are insufficient due to the absence of clear criterion of a geometry factor of the contact electrode of the 4- probe method. DC 4-probe method uses more common equipment than the AC method so that instant measurement is available and utilize it in real time for the industry. We optimized the parameters such as a diameter of the wire, a distance between wires, and a current used in the DC 4-probe method for two commercial La 0.8 Sr 0.2 MnO 3-δ. We attempt to improve 4-probe measurement method by progressing international standardization. SS4-1 한반도-동북아 ( 아므르강 -요하유역) 지역토기의흐름최상흘 *. 한양대학교한반도, 시베리아아므르강유역, 중국요하유역등지에서발굴된이른신석기시대의토기는세계문명발상지의토기보다앞선토기이다. 1. 한반도제주고산리에서 8,000~10,000년전토기가출토 (1988년발견, 1991~98년발굴 ) 되었다. 이토기는식물성섬유로보강된태토를사용하였다.( 비슷한토기편이아무르강유역에서도출토 ). 또, 강원도오산리, 부산영선동등한반도여러곳에서덧무늬토기, 누른무늬토기, 빗살무늬토기등선사시대토기가출토되었다. 2. 아므르강유역가사지역에서 13,000년전토기가출토되었다.(1975~90년) ( 고산리출토토기와유사 ) 2000~02년에는수추섬에서신석기시대유적을한-러공동으로발굴조사가실시되었다. 3. 요하유역紅山문화권, 興隆窪문화권에서 8,000년전빗살무늬토기등유물이출토되었다. ** ( 지양시사이렌동동굴에서 19,000~20,000년전토기편발굴 ) SS4-2 신라의고대유리 (Ancient Glass in Silla Dynasty) 김철영 *. 하스 126 한국세라믹학회

147 구두발표 약 5000 년전인류가유리를만들기시작한이래 BC 20 세기경부터는메소포타미아, 이집트등지에서다양한종류의유리가생산되어화장품병, 보석등장식용으로사용되었다. 이러한유리기술은 AD 1 세기경로마로전달되면서더욱활성화되었고그이후유럽의여러지역으로퍼져나갔다. 우리나라에도 AD 1 세기경부터신라를중심으로해상무역이일어나고이를통해서양의유리가한반도로유입되게된다. 또한일부유리는중국을통해전래되기도하였다. 백제무열왕릉에서출토된유리동자상과많은유리구슬, 유리관이백제고분에서나왔다. 신라황남대총, 천마총등에서출토된유리그릇, 유리병은로마, 사산조페르시아등으로부터전래된것으로보인다. 그리고유리구슬, 굽은옥거푸집이발견되어유리가신라시대에직접제조되었음을보여주고있다. 이번발표에서는신라시대에사용되었던각종유리들을소개하고이들유리가어떻게신라에전래되었는가를소개하려한다. 그리고일부유리가우리나라에서실제로제조되었을가능성에대하여토론해보려고한다. SS4-3 한국최초의요업교육기관공업전습소한상목 *. 강원대학교 1907년일본통감부는공업에관한기술을전습시키기위하여지금의공업고등학교나전문대학에상당하는 2년제의조선최초의교육기관인공업전습소를설치하였다. 설치학과는염직, 도기, 금공, 목공, 응용화학, 토목등 6개학과였고건물의위치는경성부이화동낙산아래동리였다. 당시해외로파견하던관비유학생을제한하여이들을수용하기위한목적도겸하였던전습소는 15세에서 25세의지원자에게일본어, 한문, 산술, 구두시험을치루어 1회에 67명을입학시켰다. 교사는전원일본인이었고, 학생들은매월 6원의수당을받았으며모두기숙사에수용하였다. 도기과의전습과목은도기와자기, 공통과목은물리, 화학, 수학, 도화, 일어, 영어였다. 도기과졸업생들은요업이론과실기를겸하여수학하였으므로산업계에서도자기생산에크게이바지할수있었다. SS4-4 The Cement Industry of Korea 우리나라의시멘트산업송종택 *. 단국대학교우리나라의시멘트산업연대기별발전은태동기 ( 탄생부터 ~1960 년대 ), 도약기및성장기 (1970~1980년대), 성숙및구조조정기 (1990년대 ) 를거쳐재도약기 (2000년대 ) 에이르게되었다. 광복후한국의시멘트산업은 50년대초반, 우리시멘트인들의노력으로 6.25로파괴된삼척시멘트공장의복구와 1957년 UNKRA원조로대한양회문경시멘트공장이건설된것이산업발전의시발점이다. 특히, 1970년대부터는품질향상, 품종다양화와생산기술의향상등과같은질적성장에치중하기시작하였으며, 1980년대에들어서는최신설비의증설과함께중유에서석탄으로의연료전환을완료하여경제성과생산안정성을기하는한편, 시멘트산업의제반기술수준도선진국수준에이르러세계 6위권의시멘트강국이되었다. 우리나라의시멘트생산능력의증가는주로 1960년대부터 1990 년대말사이에이루어졌으며, 1990년이후연산 6천만톤을넘는 생산능력을유지하게됨으로써, 중국, 인도, 미국및일본에이어우리나라가세계 5 위의시멘트생산능력을갖추게되었다. 그러나시멘트의생산은수요에맞추어조절하고있으며, 2015 년도의시멘트총생산량은약 5,174 만톤이었다. 또한, 우리나라의시멘트산업은짧은기간에생산기술과설비가세계정상급으로발전하여왔다. 오늘날, 고도의기술을자랑하는 NSP 가마가등장하여그성능을발휘하고있으며, 분쇄기술은새로운분쇄방식으로의전환그리고분쇄설비및방식의부분적인개량이나개선에의한분쇄에너지저감노력이계속될것으로생각된다. SS4-5 한국내화물공업의미래이홍림 *. 연세대학교우리나라내화물산업의성장과기술발전의역사는일제강점기에일본의자본과기술로설립되었던몇몇회사들이해방후에국내의낙후된기술로점토질내화물을제조하면서소규모로운영을시작했으며, 1940~1950년대국내내화물산업의태동기를거쳐, 1950년대중반에중공업, 제강, 유리, 시멘트공장이설립되는것을계기로내화물생산시설의근대화와기술향상등이이루어지기시작하였고, 1973년포항제철 (POSCO) 용광로의준공과함께국내내화물수요는크게증가하기시작하였다. 당시제철설비에대비한내화물기술기반이부족했던국내내화물업체들은일본, 유럽등의선진내화물회사들과기술제휴를통해내화물품질및제조기술, 축로기술등을축적하였으며, 이는내화물기술이발전하는계기가되었다. 1980년대와 1990년대를거치면서제품의국산화와내화물제조기술의개발에부단한노력을기울임으로써제조공정및품질안정성을확보하였으며, 국내내화물제조기술은해외선진의회사들의제품과경쟁할수있는수준의품질특성과제조기술력을확보하게되었다. 2000년대에는국내철강산업의규모가더욱커지게되었고, 철강과내화물업체들은상호협력을통해서상호간에기술이더욱성장하게되었다. 그러나최근가격경쟁력우위를바탕으로한중국산내화물이대량수입되고, 이추세는계속될것으로예상되고있어서당분간국산품이중국산제품과의가격경쟁에서우위를차지하기는어려울것으로보인다. 내화물의가격경쟁력약화는생산감소와수입량증가로이어지고, 이에따른점진적인산업규모의축소, 수익성감소및제조기술력의약화등은향후내화물산업의쇠퇴를가져올것으로우려되고있다. 한편, 국내에서제조되는내화물의품질은우수한것으로평가되지만, 다른나라에서제조할수없는고난이도기술의제품은거의없다고해도과언이아니다. 내화물제조비용및가격경쟁에서중국등후발국가들에비해뒤쳐지는국내내화물업계가직면하고있는현실에대해서내화물산업의유지와미래를위한방안이필요하다. 그방안들중의하나로서무엇보다도기술력의고도화가시급한것으로생각된다. 이에더하여내화물제조기술과관련된엔지니어링세라믹스, 우주개발산업등유사기술의개발과관련제품개발역시고려해야할것이며, 내화물고유의기능을초월하여우주시대와 4차산업혁명시대에적합하도록내화물산업을발전시켜나가야할것이다. 한국세라믹학회 127

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151 포스터발표 I P1-G1-1 Piezoelectric Properties of 0.78(Bi 0.5 Na 0.5 )TiO Sr- TiO K x NbO 3 Lead-free Ceramics 0.78(Bi 0.5 Na 0.5 )TiO SrTiO K x NbO 3 비납계세라믹스의압전특성김성원 *, 정승재, 윤지선, 정영훈, 박운익, 백종후, 홍연우, 조정호. 한국세라믹기술원 Effect of non-stoichiometric deficiency on the piezoelectric properties of 0.78(Bi 0.5 Na 0.5 )TiO SrTiO K x NbO 3 (x = 0.96, 0.98, 1.0) lead-free ceramics was investigated. From the X-ray diffraction patterns, it was confirmed that all compositions have a single perovskite structure without any secondary phases, but the phase transition occurred by the electric field. SEM analysis revealed that the grain size of the sintered specimens increased with increasing K 2 CO 3 content (x). A-site cation deficiency of K 2 CO 3 induced the increase of frequency dependence on dielectric properties. With decreasing K 2 CO 3 content (x), the remanent polarization increased, while the electric-field-induced strain and driving field decreased. These results could be attributed to the field defect by the A-site vacancy. P1-G1-2 Evaluation of Electrical Power Output on Piezoelectric Energy Harvester using PZT-PZNN Laminate Film driven in 3-1 Vibration Mode PZT-PZNN 라미네이트필름을이용한압전캔틸레버에너지하베스터의 3-1 진동모드전기적출력성능평가나용현 *, 이민선, 윤지선, 박운익, 조정호, 백종후, 정영훈. 한국세라믹기술원본연구에서는 0.73Pb(Zr 0.47 Ti 0.53 )O Pb[(Zn 0.45 Ni 0.55 ) 1/3 Nb 2/3] O 3 (PZT-PZNN) 라미네이트 (laminate) 필름을이용한압전에너지하베스터를제조한후전기적출력성능을평가하였다. 압전에너지변환소재로사용된 PZT-PZNN은높은에너지밀도 (d 33 *g 33 = 15, m 2 /N) 특성을가지며테이프캐스팅 (tape casting) 공정을이용하여제조된약 35 um 단일층두께를갖는 PZT-PZNN 필름은내부전극으로 Ag 전극을도포하여총 10층을가압한후, 920 o C에서 4시간동안동시소성공정을통해압전라미네이트필름을성공적으로제조하였다. 두께모드 (3-1 mode) 진동구현을위하여사다리꼴형태의캔틸레버빔표면에제조한 PZT-PZNN 라미네이트필름을부착하여압전에너지하베스터를제작하였다. 이를이용하여주파수응답특성및부하저항에따른전압, 전력특성을평가하였다. Bending resonance frequency는 156 Hz에서확인하였으며, 1.5 G의진동가속도에서 4.89 mw/cm 3 로높은전력밀도를나타내었다. 또한진동가속도를고려한 normalized power factor는 7.65 mw/g 2 cm3 로매우우수한압전하베스터성능을나타내었다. P1-G1-3 Development of Thermally Conductive Inorganic- Organic Insulation Composites Based on Liquid Crystalline Epoxy 액정성에폭시를기반으로한고방열성유무기절연복합소재개발박성대 *, 이우성. 전자부품연구원 This presentation introduces the thermally conductive inorganicorganic insulation composite materials. We have been studying the polymer-based thermally conductive composite such as insulation sheets, die attach silver adhesives, and so on. The synthesized epoxy with relatively high thermal conductivity are used as matrix polymers of these composites. Fillers are also very important factors in high thermally conductive inorganic-organic composites. Selection of proper fillers and surface treatment affect the thermal conductivity of composite as well as rheological and mechanical properties. We studied the filler network formation based on large size aluminum nitride and agglomerated boron nitride, and the optimum curing condition of epoxy resin compositions. The result showed high thermal conductivity above 15 W/mK and good copper peel strength about 2 kgf/cm. We expect that this result can be applied to the high power application fields such as LED packaging, power module assembly, high heat dissipation EMC, and so on. P1-G1-4 Solution-type Protective Thin Film Alternative to CIGS Solar Cell EVA Film Shield CIGS 태양전지의 EVA 필름보호막을대체가능한용액형보호박막연구이상희 *, 장호정. 단국대학교태양전지의보호막은필수요소중의하나이다. 또보호막에서나오는결함을최소로하고광투과율을높게하는것이중요한요소이다. 여러종류의태양전지중에서일반적으로 CIGS태양전지는외부로부터침투하는산소와습기등을차단할수있는보호막을형성해야한다. 또광투과율이높은보호막을선택하는데대부분보호필름을 EVA(ethylene vinyl acetate) 필름으로라미네이션공정과정을통하여형성한다. EVA 필름이 80% 이하의광투과율을갖고있다. 하지만이는 EVA 필름한장의광투과율로써일반적으로라미네이션공정에서 7장이상을사용하는데실제로는보다낮은광투과율을갖는다. 라미네이션공정과정은복잡하고실패확률도높아공정의어려움을보이고있다. 또무인항공기에적용시무게증가에따른비행시간이감소되어무인항공기에적용하기적합하지않다. 따라서공정과정을간소화하고높은광투과율을갖는경량화한보호막필름의연구가중요하다. 본연구는휨성을갖는 CIGS태양전지에침투하는외부의습기로부터차단하고 80% 이상의높은광투과율과경량보호막을개발하는연구를진행하였다. 본연구에서는 WVTR(Water Vapor Transmission Rate) 분석과밴딩테스트를통해신뢰성을확보하였고 CIGS태양전지를부착할수있는무인항공기의날개를 3D 프린터로직접설계및조립하고무게변화에따른무인항공기비행시간을시뮬레이션을통해분석하였다. 그결과개발한보호막을적용한무인항공기비행시간은약 1.2배비행시간이증가하였다. P1-G1-5 Magnetoelectric Characteristics of Magnetostrictive/ Piezoelectric Laminates employing 15-mode Ceramic-Epoxy Composite 15-모드세라믹-에폭시복합체로구성되는자왜 / 압전복합소자의자기전기특성조경훈 *, 유일열. 금오공과대학교자기전기소자는자기장을전기장으로변환할수있는특성을지니고있어메모리, 센서, 액츄에이터, 고주파소자, 광학소자및에너지하베스팅등다양한분야로의응용이제안되고있다. 기존의많은연구들은주로자왜 / 압전복합체구조를적용하였고, 대부분 31-mode 압전층을사용하여소자를구성하였다. 최근 33-mode의압전 macro-fiber-composite을압전층으로사용하여자기전기특성을증가시킨연구결과들도보고되고있다. 압전체의압전상수및계수들은일반적으로 15-mode가가장높은값을나타내며 33- 한국세라믹학회 131

152 2017 년한국세라믹학회추계연구발표회 mode, 31-mode 순으로이어진다. 그럼에도불구하고자왜 / 압전복합체소자에 15-mode 압전층을적용한사례는좀처럼찾아보기힘들며가장큰이유는자기전기효과를구현하기에적합한 15-mode 압전층의설계기술및그구현공정기술의부재에있다. 압전층의 15-mode 구현을위해서는분극방향과전극면이서로평행해야하며압전층의길이가 cm-scale 로커질경우에는길이방향으로의분극공정이매우어려워진다. 본연구에서는저주파대역에서효과적으로 15-mode 를구현할수있는새로운압전복합체구조와그공정을소개한다. 또한, 이로구성된높은자기전기감도를나타내는자기전기소자가보고된다. P1-G1-6 High-performance Gas Sensors based on 2D-SnS 2 by Atomic Layer Deposition 원자층증착법을통한이차원 SnS 2 가스센서송영근 1,2*, 편정준 1,2, 심영석 1, 주병권 2, 김성근 1, 강종윤 2. 1 한국과학기술연구원, 2 고려대학교 Two-dimensional (2D) materials have been attracted as candidates for future electronics since atomically thin layer form has exceedingly high surface-to-volume ratios. As a representative, transition metal dichalcogenides (TMDCs) have recently received a considerable attention due to their relatively high adsorption energy and sufficient band gap. Hence, various studies on the use of TMDCs have been extensively conducted as a gas sensor over the past years. However, low response, around tens of percent, still remains a challenge to be solved. Herein we investigated SnS 2 because of their high electronegativity which leads to more excellent reactivity. Firstly, SnO was synthesized by the sulfurization of atomic layer deposition (ALD) in a wide temperature range from 120 to 210 o C. After sulfurization process in H 2 S ambient at 350 o C, we could confirm that 210 o C synthesized SnS 2 has superior crystallinity and high surface roughness than other conditions. Hence, to applying SnS 2 for gas sensor, sensing performance for NO 2 and NH 3 was systematically studied using 210 o C synthesized SnS 2. We have observed excellent response with more than 100 times the response to 5 ppm NO 2 compared to other 2D materials (around tens of percent) at room temperature. Furthermore, to enhance the sensing performance, we used ultraviolet-ozone (UVO) treatment to modify the surface of SnS 2 and measure the gas sensing properties as elevating measurement temperature from RT to 200 o C. P1-G1-7 High Performance Wearable Gas Sensor Based on Si Nanomembranes 실리콘기반의고감도웨어러블가스센서한수덕 1*, 고관진 2, 황석원 2, 강종윤 1. 1 한국과학기술연구원, 2 고려대학교인간의코를대신하는가스센서는나노기술의발전으로성능이대폭향상되었으며, 극미량의가스를감지해야하는산업과군사, 환경, 의료등다양한분야에서이용되고있다. 다양한재료와방식의가스센서가개발되고있으며, 최근사물인터넷시대의도래와함께웨어러블장치로서가스센서가큰화두로떠오르고있다. 웨어러블장치에가스센서가적용되기위해우선센서구동전력소모가작아야되며, 유연한기판에적용하여구부리거나당겨도그특성이유지되어야한다. 또한신체에직접적용할수있 도록생체친화적인소자로구성되어야하며, 상온에서안정적으로작동할수있어야한다. 지금까지상온에서구동가능한웨어러블가스센서로 graphene, CNT 와다양한 1 차원나노구조체재료들이연구되어왔다. 하지만아직상온가스센서성능의미성숙, 복잡한공정, 반복생산의어려움, 고비용등의문제로실제웨어러블제품에적용하기어렵다. 이번연구에서는이러한점들해결하기위하여단결정실리콘박막을이용한새로운형태의웨어러블상온가스센서를제안하였다. 실리콘은가장대표적인반도체물질로저렴한가격으로다양한방식의공정이개발되어있다. 박막형태의실리콘을유연한폴리머기판위에전사하고 IDE 타입의전극을구성하여 NO 2, NH 3 등다양한가스를흘려주며전기저항변화를측정하였다. 만들어진센서는상온에서 NO 2 가스에대하여높은선택성을나타내었으며, 100 이상의감도와 (R gas /R air ) 60 초이내의빠른반응과회복특성을보였다. 기존에연구된상온가스센서에비하여매우높은센싱능력을나타내었으며, 반도체 MEMS 공정을적용하여대면적, 대량생산이가능하여차세대웨어러블가스센서소자로높은잠재력을가지고있다. P1-G1-8 The Study on Insulation of Fe-Si Magnetic Powder by Thin Si-O-C Glass Layer Si-O-C 유리층에의한 Fe-Si 자기분말의절연에관한연구오혜령 *, 양형우, 이규현, 이우성. 전자부품연구원 Recently, as electronic devices have become smaller and magnetic cores are required to have properties such as high permeability and low eddy current loss at high frequencies in inductors and transformers applications. Therefore, in this study, we tried to reduce the eddy current loss by producing the insulated coating on the surface of the soft magnetic metal particles. The ceramic coated layer with Si- O-C component were used for the insulation layer of metal powder, and the magnetic material with ceramic insulated layer were obtained by glass reaction with the resistivity reduced by the insulation layer. P1-G1-9 Magnetic Properties of Mn-Zn/Polymer/Ni-Zn Ferrite Multilayer Film by Spin-spray Deposition 스핀스프레이증착에의한 Mn-Zn / Polymer / Ni-Zn 계페라이트다층막의자기적특성연구이규현 *, 양형우, 오혜령, 이우성. 전자부품연구원본연구는스핀-스프레이합성법을활용해 Mn-Zn 페라이트및 Ni- Zn 페라이트의이종결합다층페라이트막을합성하고, 이에따른페라이트다층막의구조와자기적특성을고찰하였다. 이종의페라이트막을사용하여전체적인자기적특성의향상시키고, 페라이트막사이에폴리머 layer를코팅하여구조적인 stress 및안정적인성장에대한연구를진행했다. 주상구조의페라이트박막은두께가증가할수록잔류응력에의한박리현상및자기적특성저하등이나타나는데, 본연구에서는전체적인막의두께를증가하면서기공에의한 stress를줄이기위하여막과막사이에폴리머 layer를코팅을하였으며그럼에도안정적으로페라이트막이성장하는것을확인했다. 스핀-스프레이합성법을통해형성된다층의페라이트막은 SEM, XRD 등의분석을통해 Spinel 구조및주상형상으로성장하였음확인하였고, Impedance Analyzer를사용해 50 MHz의고주파영역에서고투자율의특성을나타내는것을확인했다. 이연구를통해이종페라이트박막의형태로전자기차폐및흡수에활용되는안테나, 인덕터등의전자기소자에응용이가능할것으로기대된다. 132 한국세라믹학회

153 포스터발표 I P1-G1-10 Effects of Ti-doping on Enhancement of Electrochemical Properties in DLC Film Ti 도핑이 DLC 막의전기화학적성질미치는영향연구조영주 *, 김광호. 부산대학교 T he DLC film have drawbacks for the electrode applications, such as high electrical resistivity and poor adhesion to substrates. In this study, various Ti content, Ti doped DLC films on Ti substrate were synthesized by a hybrid deposition technique using PECVD with HiPIMS. We systemically investigated influences of functionally graded sublayers, titanium doping and the correlations between the microstructure, electrical and electrochemical properties of the DLC film electrode. The results showed that the functionally graded sublayer of Ti to Ti-DLC were improving adhesion strength between the Ti substrate and DLC layer. The potential window of Ti-DLC/Ti electrodes was slightly decreased as Ti contents increase, but the electrical resistivity of DLC films was significantly reduced by small doping of Ti (3.2 at. %). In addition, the electrochemical activity and catalytic ability of the Ti-DLC/Ti electrode were also improved. P1-G1-11 Study of Electrochemical Properties of N-DLC Film for Electrode 전극활용을위한 N-DLC 박막의전기화학적특성연구손명준 *, 김광호. 부산대학교 DLC (Diamond like carbon) 박막을전극재료로활용하기위해서는높은전기저항과금속성기판에대한낮은접착력을극복해야한다. 본연구에서는 PECVD에의해합성된 DLC/Ti 전극의증착및열처리온도가접착강도와전기적및전기화학적특성에주는영향을체계적으로조사하였다. 그결과, arc ion plating (AIP) 법에의해증착된 Ti/TiC 중간층의도입은스크래치테스트와전기화학적싸이클테스트에서향상된접착강도및수명을가져온다는것을확인하였다. 그리고 arc droplet은 DLC 박막의표면적을넓혀전기화학적활성도를높이는긍정적인역할을하였다. 증착온도가높을수록 DLC 막의 sp2/sp3 비율이증가하였고, 이에따라비저항은감소하였으며전기화학적활성도는증가하였다. 반면, 가장높은전기화학적전위창은 300 o C에서얻어졌으며더높은온도에서감소하였다. P1-G1-12 Effect of Buffer Layer on Properties of Ni-Zn Ferrite Films Grown on Flexible Substrates by Spin-spray Deposition 양형우 *, 이규현, 오혜령, 이우성. 전자부품연구원 Recent developments of ferrites can fulfil the special requirements of electromagnetic interference (EMI) and near field communication (NFC) applications. Here, we have developed a Ni-Zn ferrite with buffer layer on flexible substrates (Polyimide) by the spin-spray deposition method. The effects of buffer layer on the structural and magnetic properties of Ni-Zn ferrite films were investigated by SEM, XRD, AFM and Impedance analyzer. Structure analysis indicates that the crystal structure of Ni-Zn ferrite film with buffer layer is spinel structure, which also have a columnar structure normal to the surface. The Ni-Zn ferrite films exhibit high permeability that exceed the Snoek s limit for bulk Ni-Zn ferrite. Ni-Zn ferrite films with buffer layer have relatively high permeability µ ~ 450 and µ ~ 1 up to 50 MHz, and is promising to be used as thin film devices such as a magnetic applications. The spin-spray deposited Ni-Zn ferrite films with buffer layer exhibiting high magnetic properties at both low and high frequencies provide great opportunities for fundamental studies and novel magnetic devices. P1-S11-1 The Effects of Edge Grinding Wheel Shape on the Edge Chip of Sapphire Wafers 사파이어웨이퍼의 Edge 부위 Chip 결함에대한 Edge Grinding Wheel 형상에의한영향김정 *, 송기수, 곽일환, 조현정. 한솔테크닉스 Increasing the grinding-wheel service life and reducing the edge chipping phenomenon in the groove grinding process of sapphire substrate, often requires time-consuming trials for optimizing major process parameters, including the wheel design, feeding rate, rotational speed, and cutting depth. In the present study, to better understand the effect of various process parameters on edge chipping and wheel performance, the edge grinding process behavior of sapphire substrate using various edge grinding wheels was evaluated. With the purpose of reducing the edge chipping size by changing the edge wheel manufacturing specification, we studied the effects of outer diameter, shank material, groove shape, groove angle of edge grinding wheels. P1-S11-2 Study on the New Process for Sapphire Glass with Curved(2.5D) Surface 곡면 (2.5D) 을갖는사파이어유리의새로운공정에관한연구송기수 *, 김정, 곽일환, 조현정. 한솔테크닉스 Oscar method is widely used for manufacturing the sapphire with curved surface for watch glass. Oscar method is a basically singlepiece process, so it is not suitable for mass production and automation. We studied on the new process suitable for mass production of sapphire glass with curved surface. The key processes are CNC grinding for machining curved surfaces and CMP process of batch type. For surface roughness and long life time, research on the bond material composition and diamond size of grinding wheel were carried out. For polishing of sapphire with curved surfaces in batch process, pad materials with different elastic modulus were tested. P1-S11-3 Current Status and Future Prospects of High Performance Piezoelectric Single Crystals: Lead-based and Leadfree 연계및비연계고효율압전단결정의개발현황및전망이호용 1*, 이종엽 2, 김문찬 2. 1 선문대학교, 2 ( 주 ) 세라콤 Crystallographically engineered Relaxor-PT single crystals, specifically PMN-PT and PZN-PT, offer much higher piezoelectric and electromechanical coupling coefficients (d 33 > 1,500 pc/n, k 33 > 0.9), when compared to PZT ceramics. Therefore, the high performance piezoelectric single crystals have been expected to replace polycrystalline PZT ceramics in many application fields such as ultrasound transducers (medical and NDA), SONAR transducer, piezoelectric actuators, piezoelectric sensors, ultrasonic motors and piezoelectric energy harvesting, etc. Recently the solid-state single crystal growth (SSCG) technique for fabricating the high performance lead(pb)-based piezoelectric single crystals such as PMN-PT and PMN-PZT has been successfully developed. Since the SSCG process is quite simple and similar to conventional sintering process, compared to conventional single 한국세라믹학회 133

154 2017 년한국세라믹학회추계연구발표회 crystal growth methods such as flux and Bridgman methods, it is very cost-effective and suitable to mass production. And recently the SSCG method was successfully applied to growth of lead(pb)-free piezoelectric single crystals of high electromechanical coupling coefficients (k 33 > 0.9). In this presentation the recent progress on development and application of lead-based and lead-free piezoelectric single crystals will be introduced. P1-S11-4 Solid State Single Crystal Growth of 0.75(Na 0.5 Bi 0.5 )- TiO SrTiO 3 and its Characteristic Electrical Properties 0.75(Na 0.5 Bi 0.5 )TiO SrTiO 3 의단결정및물성 Le Gia Phan 1*, Pham Thuy Linh 1, Dang Thanh Nguyen 1, Joong-Sook Lee 1, J.G. Fisher 1, Hwang-Pil Kim 2, Wook Jo 2. 1 Chonnam National University, 2 Ulsan National Institute of Science and Technology Ceramics of 0.75(Na 0.5 Bi 0.5 )TiO SrTiO 3 (NBT-25ST) show a giant strain caused by a field induced phase transition, with a value of inverse piezoelectric coefficient, d 33*, of 600 pm/v at 4 kv/mm [1] that makes them attractive for stack actuator applications. As of yet, the electrical properties of NBT-25ST single crystals have not been studied. In this work, NBT-25ST single crystals have been grown for the first time by the Solid State Crystal Growth (SSCG) technique on [001] and [110]-oriented seed crystal at an optimized sintering temperature of 1250 C. The grown single crystal thickness is ~300 mm after sintering for 5 hours with an [110]-oriented seed. The single crystal shows relaxor ferroelectric behaviour. A rhombohedraltetragonal transition temperature of ~125 C was revealed through the relative permittivity and the loss tangent curves. A temperature of maximum dielectric constant was obtained at ~218 C via the relative permittivity curves. The conductivity vs. temperature curve shows an activation energy of ± ev. The piezoelectric properties of the NBT-25ST single crystal are measured and compared with those of polycrystalline ceramics. P1-S11-5 Origin of Large Piezoelectric Effect in Pb(Mg 1/3 Nb 2/3 )- O 3 -PbTiO 3 Single Crystals Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 단결정의높은압전특성의원인김황필 1*, 신유리미 1, 안창원 2, 이호용 3, 이상구 4, 조욱 1. 1 울산과학기술원 (UNIST), 2 울산대학교, 3 선문대학교, 4 ibule Photonics Co., Ltd. Polarization rotation may not be the reason why PMN-PT single crystals present excellent piezoelectric properties as well as giant electromechanical strains. Here we demonstrate that the aforementioned functional properties have little to do with a polarization rotation by the comparison between the ibule bridgman crystal and the Ceracomp SSCG crystal. We implied that the true reason for the enhanced properties be related to a possible presence of relaxor vs. ferroelectric boundary that favors a miniaturization of domain sizes, i.e., nano-polar domains. P1-S11-6 Enhanced Properties of Lead-free Piezoelectric Ceramics by Using Template Grain Growth Method 입자배향성장법을이용한무연압전세라믹의향상된특성강우석 1*, 최강호 1, 안창원 2, 조욱 1. 1 울산과학기술원 (UNIST), 2 울산대학교 Piezoelectric materials have possibility to apply for various area due to their characteristic of transform from mechanical energy to electric energy and from electric energy to mechanical energy. But, there were some trouble to use them in practice. One of the problem is that excellent properties were showed at single crystal not the poly crystal. So, we need to single crystal, but it is expensive to manufacture. For this reason, many researchers have been looking for way to increasing piezoelectric properties. Some groups research on changing composition by using dopant, or increasing the number of component system for enhanced properties. But, here is more efficiency method to improve the piezoelectric properties. It is Template Grain Growth (TGG). This method allows to growth of the matrix with same direction of the template. The matrix crystal can be well-aligned better than conventional ceramics. Therefore, TGG lead to improvement of piezoelectric properties. We investigated effect of TGG method through some piezoelectric materials. Some promising lead-free piezoelectric material systems based on bismuth were used as the matrix powder and BaTiO 3 templates were synthesized by topochemical method. The effect of TGG for the piezoelectric properties will be discussed in this paper. P1-S11-7 Characterization of GaN Grown by HVPE as Thickness HVPE로성장시킨 GaN 단결정의두께에따른특성평가이희애 1*, 박재화 1,2, 이정훈 1, 이주형 1, 박철우 1,2, 강효상 1,2, 강석현 1, 심광보 1. 1 한양대학교, 2 에임즈마이크론 ( 주 ) GaN은 GaP, GaAs, GaAlAs 등기존의재료들에비해우수한발광특성을갖고있어, 이를고휘도 LED, LD에적용하기위한많은연구가진행되고있다. 그러나 sapphire 기판위에성장시킨 GaN 단결정은 sapphire와의큰격자부정합과열팽창계수차이때문에결정내부에잔류응력과결정결함이존재하게되며, 이는발광소자의발광효율및전자소자의수명감소등저해요인으로작용하게된다. 본연구에서는 HVPE를이용하여두께 0.4 ~ 1.5 mm로성장시킨 GaN 단결정을통해, GaN 결정의두께증가에따른특성을분석함으로써, 고휘도 고출력 LED 제조에기판으로의적용가능여부를평가하고자하였다. 성장된두께에따른특성분석은 KOH/NaOH 화학습식에칭후, 에칭된표면을 SEM으로관찰하여결함밀도를분석하였고, 결정내부의잔류응력을확인하기위해 Raman spectroscopy 분석을사용하였다. 또한 Photoluminescence 분석을통해광학적특성을분석하였다. P1-S11-8 Synthesis and Microwave Dielectric Properties of the Bi 2 Ge 3 O 9 Ceramics 비스무스저머늄옥사이드세라믹의합성과마이크로웨이브유전특성 MA XINGHUA *, 남산. 고려대학교 In this work, the synthesis process and the microwave dielectric properties of the Bi 2 Ge 3 O 9 ceramics have been studied for the first time to investigate their potential application for the advanced substrate materials. During the synthesis of Bi 2 Ge 3 O 9 ceramics by using Bi 2 O 3 + 3GeO 2 powders, the Bi 4 Ge 3 O 12 phase was formed at low temperature ( 800 o C). However, Bi 4 Ge 3 O 12 preferentially adopted GeO 2 -excess phase, and this phase was consistently present in the sintered Bi 2 Ge 3 O 9 ceramic as a secondary phase. Therefore, Bi 4 Ge 3 O 12 powder was first calcined and subsequently reacted with GeO 2 powder to obtain the pure Bi 2 Ge 3 O 9 ceramic through the 134 한국세라믹학회

155 포스터발표 I following reaction: 1/2Bi 4 Ge 3 O /2GeO 2 Bi 2 Ge 3 O 9. Formation of the Bi 2 Ge 3 O 9 phase was initiated at temperature of 850 o C. The pure Bi 2 Ge 3 O 9 ceramic sintered at 875 o C for 8 h had a dense microstructure with an average grain size of 2.7 μm. Furthermore, the pure Bi 2 Ge 3 O 9 ceramic exhibited promising microwave dielectric properties for the advanced ceramic substrate: ε r = 9.7, Q f = 48,573 GHz and τ f = 29.5 ppm/ o C. P1-S14-1 Electrical and Optical Properties of PbS Films Fabricated by Chemical Bath Deposition and their Photovoltaic Characteristics Chemical Bath Deposition으로성장한 PbS 박막의전기적, 광학적특성과이를이용한광전압형중적외선소자응용김중동 1*, 오은순 1, 안학영 2, 조소혜 3. 1 충남대학교, 2 고려대학교, 3 한국과학기술연구원 PbS와 PbSe는 IV-VI 반도체로낮은밴드갭과높은흡수율을이용하여적외선에응용되는물질이며열전소재나 solar coating에응용되는물질이다. PbS는박막뿐아니라나노선, 나노입자와같은나노구조형태로많이연구되고있다. 본연구에서는 Chemical Bath Deposition으로 PbS 박막을성장하고구조적, 전기적, 광학적특성을측정하였다. Hall 측정결과 p-type으로정공의이동도는 40 cm 2 / Vsec를얻을수있었으며이는동일한방법으로성장한 PbS 박막으로는보고된가장높은값이다. 적외선대역의투과도와반사도를이용하여얻은밴드갭은 0.45 ev로 bulk의경우와유사한값을얻을수있었다. 또한이박막을설퍼링이나셀레나이제이션처리를하여특성이변화하는것을연구하였는데 hole 농도가높아지는것을확인하였다. 이박막을이용하여광전압형중적외선소자를제작하고특성을평가하였다. P1-S14-2 Effects of Cu Content on Electrical Properties of Copper-nickel Manganite Thin Films 구리-니켈망가나이트박막의전기적특성에미치는구리함량의영향최용호 *, 전창준, 정영훈, 윤지선, 박운익, 백종후, 홍연우, 조정호. 한국세라믹기술원 [(Ni 0.3 Mn 0.7 ) 1-x Cu x ] 3 O 4 (0.22 x 0.30) thin films were fabricated by metal-organic decomposition to develop new thermal imaging materials applicable to microbolometer. The effects of Cu content on the electrical properties of the annealed films were studied. The thin films annealed at 400 C for 1 h showed a thickness below 100 nm. The microstructure of the annealed films was not affected by the Cu content. A single phase of cubic spinel structure was confirmed in all of the annealed films. The resistivity (ρ) of the annealed films decreased with increasing Cu content due to the hopping mechanism between Cu 1+ and Cu 2+ cations in octahedral sites. The negative temperature coefficient of resistance (TCR) of the annealed films also decreased with an increase of Cu content. Good electrical properties with values of ρ = 5 Ω cm and TCR = -1.45%/K at 25 C were obtained in x = 0.28 films annealed at 400 C for 1 h. P1-S14-3 Optical Properties of Infrared Transparent ZnS Ceramics by Sintering Holding Time 소결시간에따른적외선투과용 ZnS의광학적특성여서영 *, 권태형, 박창순, 김창일, 박운익, 윤지선, 정영훈, 홍연우, 조정호, 백종후. 한국세라믹기술원 Zinc sulfide (ZnS), being an important II-VI group semiconductor with its excellent physical properties has recently been investigated extensively due to its wide band gap and high refractive index. ZnS is applicable for a variety of other applications, such as light-emitting diode (LEDs), flat panel devices, solid state solar window layers, phosphors, photoconductors and infared (IR) window/lens etc. Polycrystalline hot-pressed ZnS is one of the most important IR permeate materials, which has excellent mechanical and optical property comparing with polycrystalline chemical Vapor Diffusion-ZnS. For this reason, ZnS has been studied for its wide applications in infrared optical windows and some other infrared image system. In this study, the effect sintering holding time on the transparency of ZnS ceramics in HP process was investigated systematically. Hydrothermal synthesis powder (180 o C 70 h) sintered at same sintering temperature (950 o C) and sintering pressure (30 Mpa) for different sintering holding time. The structural and optical properties of HP-ZnS crystals are analyzed with X-ray diffraction, scanning electron microscopy and Fourier tranform-infrared spectroscopy. P1-S14-4 Synthesis and Characterization of Infrared Transmission ZnS Ceramics by Heat Treatment Time 열처리시간에따른적외선투과용 ZnS 세라믹의합성과특성박창순 *, 권태형, 여서영, 김창일, 박운익, 윤지선, 정영훈, 홍연우, 조정호, 백종후. 한국세라믹기술원 Infrared transmission zinc sulfide (ZnS) ceramics have been widely studied to meet this high transmission. Infrared transmission ZnS require a high purity and density to achieve high transmission. To achieve a high purity and density, the studies of heat treatment and sintering process are needed. In this study, heat treatment and sintering time behavior of ZnS powders produced through hydrothermal synthesis at 180 o C for 70 h were studied. The heat treatment of ZnS powders proceeded at respectively unheated, 30 min, 1 h, 2 h, 4 h for 550 o C in a vacuum atmosphere (10-2 torr). And the heat treated ZnS powders were sintered by hot press sintering method in a vacuum atmosphere (10-2 torr). To investigate the change of structural properties and optical properties of ZnS ceramics, using X-ray diffraction, scanning electron microscopy, and Fourier transforminfrared spectroscopy. P1-S14-5 Properties of DLC-deposited Chalcogenide Window DLC가증착된 Chalcogenide window의광학적특성정주연 *. ( 주 ) 유니벡최근열감지센서및열영상처리를위한적외선광학계에관한연구가광학산업에서큰주목을받고있다. 본실험에서는 PECVD 방법을사용하여적회선용 Window 재료인 Chalcogenide에 DLC 를증착하여광학적특성을조사하였다. 증착된박막의두께는 a-step으로측정하였고, 내구성조사를위하여테이프, 내마모, 염수분무실험등을실시하였다. 적외선광학재료의중요한특성인투과도는적외선분광기를사용하여측정하였다. 실험결과 DLC가증착된 Chalcogenide window는 bare Chalcogenide window 대비약 30% 의투과율향상을관찰할수있었다. 증착된 chalcogenide window를사용하여제작된광학계의활용예에대하여간단히소개한다. 한국세라믹학회 135

156 2017 년한국세라믹학회추계연구발표회 P1-S15-1 Characteristic Change of Metal Insulator Metal (MIM) Capacitor by Deposition of High-k Insulator using PE- ALD PE-ALD를이용한적층구조 High-k 절연체의증착에따른 Metal Insulator Metal (MIM) Capacitor 의특성변화심호재 *, 최은화, 고원, 이강원, 표성규. 중앙대학교반도체산업의급격한발전으로초고집적화시대가됨에따라커패시터의높은전하축적도가요구되고있다. ANALOG/MIXED- SIGNAL (AMS) 공정은 4개의주요공정으로분류된다. 그유형은다음과같다 : 금속-절연체-금속 (MIM), 폴리실리콘-절연체-폴리실리콘 (PIP), lateral flux (finger), MOS-style (depletion or accumulation). 그중비메모리반도체공정인 Metal Insulator Metal (MIM) 커패시터는전압과온도에매우훌륭한선형성의특징으로인해매우각광받는기술이다. 절연물질로현재사용되는실리콘산화막또는실리콘질화물은두께가얇아짐에따라급격하게누설전류가증가되어대체높은유전상수를가진Al 2 O 3, ZrO 2, HfO 2 등의절연체에대한연구가활발히이뤄지고있다. 본연구에선플라즈마전처리후 plasma enhanced-atomic layer deposition (PE-ALD) 을사용하여 Al 2 O 3 /HfO 2 /Al 2 O 3 (AHA), SiO 2 / HfO 2 (SH) 적층구조의절연체를형성하였으며 SiO 2 의두께비율에따른커패시터성능의영향성을평가하였다. 절연층의특성인 Breakdown 특성을 TEM 이미지를통해표면형상을관찰하였으며 VRDB (Voltage Ramp Dielectric Breakdown) 를측정하여차세대절연막으로서의가능성을확인하였다. P1-S15-2 Synthesis of Metal Nanotube Composites by Electrospinning Electrospinning에의한금속나노튜브복합재료의합성이강원 *, 최은화, 심호재, 고원, 표성규. 중앙대학교금속나노튜브는메모리, 센서, 전극및분석과같은많은응용분야에서광범위하게사용되어왔지만그과정은값비싸고복잡하다. 기존사용되었던 AAO (anodic aluminium oxide) 또는 PC (poly carbonate) template은금속을도금하고 template을제거하여사용됐다. 금속나노튜브의장점은넓은비표면적, 화학적안정성, 기계적안정성및고유한특성이다. 또한 high-density magnetic memory, catalyst for solar/fuel cells, sensing device, drug delivery system와같은많은응용분야에서사용된다. 본연구에서는 Ni 나노튜브의간단하고저비용의공정으로방향성이없는나노섬유로사용되는 photoresist derived electrospun nanofibers와적절한 UV 처리를통해 Pd 활성화된무전해 Ni nanofiber를개발했다. 속이빈 Ni nanofibers로 nanocomposite을형성하기위해서는전기방사와무전해도금기술이요구되며, 전기방사로만들어진 polymer nanofibers를 template로사용하고그위에무전해도금기술로 50nm 내외의매우얇은두께의 Ni을도금하여새로운구조의촉매를개발하였다. 이번연구를통해개발한속이빈 Ni nanofibers nanocomposite은절대적으로쓰이는촉매의양을최소화할수있어경제적이며, triple phase boundary (TPB) 가극대화되어반응속도를높일수있으며, 속이빈구조이므로기체연료의추가적인통로로쓰일수있을것으로기대된다. 이를증명하기위하여 Ni nanoparticles가아닌 Ni nanofibers를적용한 Ni-YSZ 신소재로전극을제조하고, 전극에대한열적 / 화학적안정성, 기계적강도및전기적, 전기화학적특성을평가하였다. P1-S15-3 Microstructural Evolution of CIGS Thin Films by Electroless Plating Process 무전해도금을이용한 CIGS 태양전지박막형성및마이크로구조특성분석고원 *, 최은화, 심호재, 이강원, 표성규. 중앙대학교 CuIn 1-x Ga x Se 2 light absorber layers has attracted great attention as next-generation solar cell due to its high absorption coefficient and excellent power conversion efficiency. However, a conventional fabrication process of depositing CuIn 1-x Ga x Se 2 thin films usually utilize co-evaporation and electroplating processes, nevertheless, both of them are expensive and it offers narrow option for substrate material to enhance efficiency because selenide process need to conduct in high temperature. In this study, CuIn 1-x Ga x Se 2 thin films are deposited by electro-less plating (ELP) which possesses the advantages of low processing cost, easy preparation, easy mass production (no vacuum). During the reaction, citric acid and NTA as complexing agents to reducing CuCl 2, InCl 3 and H 2 SeO 3 and ph maintain to 5. Field emission scanning electron microscopy (FE- SEM) is used to investigate the thickness of CIGS layer is 1 μm to 2 μm. According to scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX), the distribution and elements composition of deposited thin films were exposited. P1-S15-5 Synthesis and Analysis of Sensing Characteristic of nano-sized ZnO/Zeolite-MWCNT ZnO/Zeolite-MWCNT의합성및가스센싱특성분석최은화 *, 심호재, 고원, 이강원, 표성규. 중앙대학교인간과기기간상호작용심화에따라모든기기가지능화되고있으며, 이에따라센서의기능도소형화 복합화되고있다. 그중에서가스센서는공장이나병원등일상생활에서유독가스나유해물질을검출할수있어미리중독을예방하므로매우유용하게사용된다. 이번연구에서는선택성이우수한센서재료를개발하여기존반도체식가스센서의감도를제고하고자하였다. 탄소나노튜브를기반으로각종나노분말을합성하여 ZnO- MWCNT, Zeolite-MWCNT 나노복합체를제조하여가스센서에응용하였다. MWCNT는그자체의작은사이즈, 높은비율의표면적으로인해매우민감하기때문에응답속도가빨라서센서응용에매우적합하다. 또한 ZnO, Zeolite 같은경우흡착제, 흡수제로많이사용되기도하기때문에선택적가스에대한흡착성을가지고있다. ZnO-MWCNT와 Zeolite-MWCNT의합성은모두균일한분산에중점을두었고그구조와결정성은 FE-SEM, XRD, Raman spectroscopy를통하여분석을진행하였다. 또한가스센서에서사용된가스는에탄올, 아세트산가스이며 ZnO-MWCNT와 Zeolite-MWCNT 두물질을입혀서반도체식가스센서를제작하여가스에대한감도를측정하였다. 즉 ZnO-MWCNT와 Zeolite- MWCNT와같은선택성이우수한센서재료를개발하여기존반도체식가스센서의감도를제고하고자하였다. P1-S15-6 Atomic Layer Deposition Oxide Thin Film Analysis Using Resonance Raman Scattering 공명라만산란을이용한원자층증착산화물박막분석기법심호재 *, 최은화, 고원, 이강원, 표성규. 중앙대학교현재차세대디스플레이를만들기위해서는높은전자이동도와신뢰성을갖춘고성능트랜지스터가필요하다. 이에따라우수한전기적, 광학적특성을가진산화물박막트랜지스터에대한연구가이루어지고있다. 그중, 산화아연은화합물반도체에속하고, 약 3.4 ev의넓은밴드갭을갖는물질이다. 가시광선에서투명 136 한국세라믹학회

157 포스터발표 I 하여레이저및 LED 와같은장치에적합한재료로각광받고있으며저온에서성막하여도높은채널이동도를얻을수있다는장점이있다. 본연구에서는 130 o C 이하에서원자층증착 (Atomic layer deposition) 을이용하여다양한두께의산화아연을증착하였다. 원자층증착으로성장된산화아연박막의특성을명확히분석하는것이목표이며, 실리콘웨이퍼의계면상태, Bonding stress 측정을위해원자력현미경 (Atomic Force Microscopy) 분석을진행하였다. 각증착된산화아연의상분석을위해 X- 선회절분석기 (X-Ray Diffraction) 를이용하여분석하였다. X- 선회절분석기와는달리라만분광법은광자의비탄성산란을측정할수있는도구이므로라만분광법으로박막을분석을실시하여라만분석과 XRD 데이터를비교하여정량및정성분석을비교분석을실시하였다. 또한, 방출스펙트럼은광발광 (Photoluminescence) 스펙트럼분석을실시하였다. P1-S16-1 Study on Semi-insulating SiC Growth Process for High Resistivity 고저항의반절연 SiC를구현하기위한성장방법연구이채영 1*, 최정민 1, 김영곤 1, 최수훈 1, 박미선 1, 장연숙 1, 정광희 2, 김태희 2, 최이식 2, 이원재 1. 1 동의대학교, 2 사파이어테크놀로지본연구는 PVT (Physical Vapor Transport) 법을이용한고순도실리콘카바이드를사용하여바나듐이도핑된반절연 SiC 단결정성장에미치는영향에대한연구를진행하였다. 다공성흑연으로제작된내부도가니 (Ø30 mm 25 mm) 안에는바나듐카바이드 (VC) 의분말을채워넣어어떠한바나듐승화양상을보이는지비교하기위해흑연도가니상부와하부에각각삽입하였다. 6H-SiC, Siface의종자정을사용하여 o C의성장온도에서 50 h 동안성장을진행하였으며, 이때아르곤분위기에서성장압력을 mbar로유지시켰다. 성장된결정은투과 / 흡수스펙트럼을확인하기위해 UV-VIS-NIR 을이용하여스펙트럼분석을하였고, X-ray를이용하여 X-ray 회절패턴과결정성을확인하였다. 또한광학현미경을이용하여결함및표면을관찰하였으며, SEM (Scanning electron microscope)/ EDS (Energy dispersive spectrometer) 와 SIMS (Secondary Ion Mass Spectrometry) 분석을통해바나듐도핑및불순물농도를확인하였다. 또한 Corema 측정을통해웨이퍼의비저항값을확인할수있었다. P1-S16-2 Simulation Study of Breakdown Voltage of Lateral 4H-SiC MOSFET with RESURF and Source Field Plate RESURF와소스필드플레이트가설계된수평형 4H-SiC MOSFET 의항복전압의시뮬레이션연구김태은 *, 이호준, 하민우. 명지대학교 4H-SiC는우수한전기물성과낮은진성캐리어생성률로인하여전력용반도체소자에적합한소재로보고되고있다. 본연구의목적은수평형 4H-SiC MOSFET에 RESURF (reduced surface field) 와소스필드플레이트를설계하여 1200 V급항복전압을구현하는것이다. 채널과 n+ 드레인사이에위치한 RESURF용 n 접합은역바이어스시수직및수평방향으로공핍되어전계의최대값을감소시킬수있고, 소스필드플레이트는게이트에지에집중된전계를분산시킬수있어항복전압을개선할수있다. 소자의항복전압을연구하기위하여이차원수치해석시뮬레이션을이용하였다. P- 드리프트층의농도, 두께및길이는각각 cm -3, 22 μm 및 10 μm이었다. RESURF용 n 접합의깊이와길이는각각 1 및 12 μm 이었다. 또한게이트산화막의두께및게이트전극과소스필드플레이트사이절연막의두께는각각 0.1 μm 및 0.5 μm 이었다. RESURF 용 n 접합의도핑농도에따라드레인항복전압은민감하게변화하며, 도핑농도, cm -3 일때최대값, 1250 V 을가진다. 또한소스필드플레이트를제거하면드레인항복전압은 950 V 로감소된다. 소스필드플레이트길이역시항복전압에영향을미치며 10 μm 일때최대항복전압을가진다. RESURF 용 n 접합길이는증가할수록공핍영역이확대되어항복전압역시증가한다. 또한게이트산화막과드레인에지에걸리는전계를동시에감소시키기위한 two-zone RESURF 도설계되었으며, 2 개 RESURF n 접합들의농도에따라서드레인항복전압이변화됨을연구하였다. P1-S16-3 Formation of the Uniform Interface Ni/4H-SiC Ohmic Contact with Titanium as Barrier Layer Ti 금속을이용한 Ni/4H-SiC의균일한계면을가지는오믹접촉형성나문경 1*, 금주연 2, 강인호 1, 문정현 1, 김상철 1, 김형우 1, 석오균 1, 방욱 1. 1 한국전기연구원, 2 창원대학교 Development of silicon carbide (SiC) devices is of great interest since they outperform silicon-based counterparts, providing lower onresistance, high switching speed, and high thermal conductivity. Formation of low-resistance ohmic contacts is one of the most critical issues during device processing for the reliable performance and its wide application. It would simplify the device fabrication processes using nickel (Ni) because which can simultaneously form n-type and p-type ohmic contact with SiC. Although the conventional Ni contact has many advantages, it also has drawbacks, such as the formation of rough interfaces and the difficulty in controlling the depth of reaction, which cause the problem about stability and reliability. In this study, we developed the formation of the uniform ohmic contact interface. For solve this problem, titanium (Ti) is applied to contact metal as barrier layer. Ti exhibits good adhesion to SiC, it is expected to improve the interface property of Ni/SiC ohmic contact. The electrical characteristics and the formed silicide structure were proceeded to compare to whether or not application of the Ti barrier metal to contact metal. P1-S16-4 Simulation Study of Electrical Characteristics of SiO 2 / 4H-SiC MOSFET with n- JFET Junction N- JFET 접합에따른수직형 SiO 2 /4H-SiC MOSFET의전기적특성의시뮬레이션연구이호준 *, 김태은, 하민우. 명지대학교 Si에비해항복전계가 10배큰 4H-SiC는고내압과낮은스위칭전력손실을가지며높은열전도성으로고온동작및소형화칩이가능한장점을갖는다. 본연구의목적은수치해석시뮬레이션을이용하여수직형 4H-SiC MOSFET의채널이끝나는영역에 n- JFET 접합을설계하여 JFET 저항에따른전기적특성을연구하는것이다. 소자의 active 항복전압은 600 V가만족되도록설계를수행하였다. 설계된수직형 SiO 2 /4H-SiC MOSFET의 n- 드리프트층의농도와두께는각각 cm -3 와 5 μm이며, half cell pitch는 5.95 μm이다. 소자의채널길이와 SiO 2 게이트절연막의두께, 추출된문턱전압은각각 1.7 µm, 50 nm, 3 V이다. 동일한두께를가지는경우 N- 드리프트농도가증가함에따라드레인항복전압이증가함을확인하였다. N- JFET 접합의농도 (n JFET ) 는온-저항과항복전압모두에 한국세라믹학회 137

158 2017 년한국세라믹학회추계연구발표회 반비례하였다. 소자의온 - 저항은게이트전압 = 15 V 및드레인전압 = 2 V 조건에서추출하였다. n JFET 이 , cm -3 인및 N- JFET 접합이없는경우 (n JFET = cm -3 ) 온 - 저항 ( 항복전압 ) 은 8.44 mω-cm 2 (55 V), 8.50 mω-cm 2 (655 V), mω-cm 2 (667 V) 으로추출되었다. N- JFET 접합이설계되었어도 n JFET 에따른온 - 저항의차이가크지않은이유는 JFET 길이 (1.25 µm) 으로짧아 JFET 저항이크기때문이다. JFET 길이를 2.25 µm 으로증가시키면 n JFET 가 , cm -3 이면온 - 저항은 7.28, 7.94 mωcm 2 으로 n JFET 에따른 R on,sp 변화가커진다. 결론적으로수직형 4H- SiC MOSFET 의온 - 저항과 active 항복전압의최적화트레이드오프관계를확보하려면 N- JFET 접합의최적화연구가필요하다. P1-S16-5 Electrical Properties of Entirely Implanted Lateral MOSFETs Using On-axis Semi-insulating SiC Substrates without Epi-layer 에피층이없는정축반절연 SiC 기판을이용하여이온주입공정만으로형성된수평전계효과트랜지스터의전기적특성문정현 1*, 이현수 2, 김형우 1, 방욱 1, 석오균 1. 1 한국전기연구원, 2 경상대학교 In this work, we have investigated the electrical properties of gate oxide/sic interface for the firstly fabricated lateral MOSFETs using on-axis semi-insulating SiC substrates without epi-layer. The samples were processed by using on-axis V doped semi-insulating (VDSI) 6H- SiC and on-axis high-purity (HPSI) 4H-SiC substrates. For comparison, n-type 4 o off-axis <0001> oriented 4H-SiC substrate with a 10 μm thick epi-layer, doped with a concentration of cm -3 was also prepared. The all (p-well, n + and p + source) regions were formed by implanting Al or N ions at 773 K. The mobilities of on-axis HPSI and 4 o off-axis n-epi samples were 14, 19 cm 2 V -1 S -1 respectively. It is shown that twenty percent of the mobility redued by using on-axis HPSI substrate as compared with the value of 4 o off-axis n-epi substrate. On the other hand, for the on-axis VDSI sample, the two mobilities peak at 37, 50 cm 2 V -1 S -1. The mobility of VDSI sample was twofold higher than that of HPSI sample. The bulk SIMS results reveal that concentration of impurites (V, B, Al, N) for VDSI sample were much higher than that of HPSI. The interface layer is expected to react at oxide/vdsi substrate interface to form a compound during thermal oxidation process which may stabilized the interface layer chemically. P1-S16-6 Fluorescence Characteristics in Various SiC Polytypes Evaluated by Raman Spectroscopy, Photoluminescence and X-ray Topography 다양한 SiC 결정내폴리타입별발광특성분석및평가신윤지 *, 변대섭, 윤지영, 최형석, 정성민. 한국세라믹기술원탄화규소 (SiC) 소재는고전압, 고주파및고출력반도체분야에가장적합하다고알려져있으며, 기존의실리콘소재에비해물리적, 전기적특성이월등히뛰어나차세대전력반도체소재로써주목받아왔다. SiC는 polytypism으로알려진다양한결정구조를가지는데, 가장많이연구되고있는결정다형 (polytype) 으로 3C, 4H, 그리고 6H가있다. 이러한다양한상은결정의적층주기에의해형성되는것으로서, 결정상마다서로다른전기적특성을가지고있어서산업에서는단일상을갖는단결정 SiC를성장시키는것이무엇보다중요하다. 이들결정상은 Raman spectroscopy, Photoluminescence 등의광학분석법을통해손쉽게판별할수있다. 본논문에서는, 자체적으로개발한 Ultraviolet Florescence (UVF) 분석법을이용하여다양한결정상을갖는 SiC 샘플들을분석하고, 또한 UVF 분석기법을평가했다. UVF 는 SiC 결정상을수초내에, 웨이퍼단위로분석할수있는강력한기술이며, 별도의샘플전처리작업을필요로하지않아손쉽게접근할수있는새로운광분석기법이다. 본연구를위해 PVT 법으로성장시킨 4H-SiC 잉곳을웨이퍼로가공후 UVF 로결정상분석을진행했으며, 분석한결과를토대로 Raman spectroscopy, Photoluminescence 그리고 Synchrotron X-ray topography 측정을통하여 UVF 분석법의평가를함께진행하였다. P1-S16-7 Analysis of Carbon Concentration and Temperature Distribution in the Top Seeded Solution Growth for SiC Bulk Crystals SiC 단결정성장을위한상부종자용액성장법에있어서카본농도와온도분포에대한고찰 Ha Minh Tan 1*, 신윤지 1, 이명현 1, 김철진 2, 정성민 1. 1 한국세라믹기술원, 2 경상대학교 Silicon carbide (SiC) is a promising material for the next generation power semiconductors due to its excellent electrical and mechanical properties. There are known several methods to growth SiC crystal so far. The top seeded solution growth (TSSG) method has been known as a method able to achieve high quality SiC bulk crystal because the crystal growth of SiC could be done under near equilibrium condition. In TSSG method, the direct factors determining the crystal growth rate are t he supersaturated amount of the dissolved carbon in Si melt especially near the seed crystal and the kinetics of the crystal growth on the seed crystal. To evaluate the crystal growth of SiC, we employed simulation technique considering the carbon solubility, mass and heat transfer in the Si melt. The temperature gradients in the Si liquid were evaluated under several hot zone design. Experimental crystal growth was carried out under some selected design. For the characterization of the grown crystals, optical image, Raman spectroscopy and high resolution X-ray diffraction were carried out. P1-S16-8 Static Characteristics of Lateral p-i-n Diode Implemented on 4H-SiC Semi-insulating Substrate 4H-SiC 반절연기판을이용한수평형 p-i-n 다이오드의전기적특성분석이현수 1*, 석오균 2, 김형우 2, 문정현 2, 방욱 2, 박기철 1. 1 경상대학교, 2 한국전기연구원 Demand for 4H-SiC lateral devices with high blocking voltage is increased with the necessity to implement both high voltage device and low voltage circuits on a single chip. In this paper, to figure out the potential of a 4H-SiC semi-insulating substrate as a candidate material for lateral devices, we propose and investigate the static characteristics of a lateral p-i-n diode implemented on the 4H-SiC semi-insulating substrate without using an epitaxial layer. The on-axis HPSI (High Purity Semi-Insulating) substrate was used to fabricate the lateral p-in diodes, and static characteristics of the devices were investigated. In order to improve the forward characteristics, the intrinsic region of the proposed diodes was replaced with CPL (Current Path Layer). To investigate the effect of CPL length on static characteristics, length of CPL was varied from 5 to 20 μm. Measured maximum breakdown 138 한국세라믹학회

159 포스터발표 I voltage of the proposed diodes was 935 V with CPL length of 20 μm. Forward voltage drop of the proposed diode was 2.1 V at I A = 1 μa regardless of the CPL length without any significant deviations. In addition, when the CPL is inserted, the forward current increased because the diffusion length of the free carriers becomes longer. Considering the measured forward and reverse characteristics of the proposed diode, semi-insulating substrate with CPL is suitable for the 4H-SiC lateral device. P1-S16-9 Low Leakage Current of 4H-SiC Junction Barrier Schottky (JBS) Applying Trench Structure 낮은누설전류를갖는 4H-SiC 트렌치 JBS 다이오드김동영 1*, 석오균 2, 김형우 2, 방욱 2, 박기철 1. 1 경상대학교, 2 한국전기연구원 We have fabricated junction barrier Schottky diode (JBS) applying trench structure in order to prevent electric field concentration at Schottky metal effectively. As a results, we obtained lower leakage current than planar JBS. To fabricate the proposed device, trench structure was formed before process of ion-implantation. Trench structure was formed by ICP-RIE with SiO 2 etching mask. We optimized condition of trench etching to prevent premature breakdown phenomenon by eliminating the micro-trench and making the U-Shape. The trenched JBS we proposed showed similar to forward characteristics with conventional JBS while its leakage current is 10-2 times lower. Through this structure, we would reduce a power dissipation under reverse bias. The effect of trench and width of Schottky metal will also discussed. P1-S16-10 Improvement of SiC Crystal Quality in TSSG Process Using Modified Crucible Structure 상부종자용액성장법에서변형된도가니를이용한고품질 SiC 단결정성장에관한연구김영곤 1*, 최수훈 1, 이채영 1, 최정민 1, 박미선 1, 장연숙 1, 이원재 1, 신윤지 2, 정성민 2, 이명현 2. 1 동의대학교, 2 한국세라믹기술원탄화규소 (Silicon carbide, SiC) 는고전압그리고고주파, 고온전자의응용디바이스에적합한넓은밴드갭의물성을가지고있기때문에차세대전력반도체로써유망한물질이다. 많은 SiC 단결정성장방법중의하나인용액성장법은열평형에가까운상태에서공정이진행되므로고품질 SiC 단결정을얻는좋은성장방법중의하나로알려져있다. 오늘날, 용액성장법으로써상부종자용액성장법 (top-seeded solution growth, TSSG) 이많이사용되고있으나, 성장도중공정분위기의불안정으로용액내부의다결정생성및 SiC 결정내부로의융액혼입등의문제로장시간성장및고품질의 SiC 결정을얻는데에어려움을겪고있다. 이러한문제를해결하기위하여, 많은연구자들이용액의조성을변경시키며, 유체흐름을바꿔주기위하여 hot-zone 구조를변경하는등의여러방법을이용한연구를활발히진행하고있다. 본실험에서는도가니의구조변경을통하여용액흐름을조절하고도가니로부터용해되는탄소의양을증가시켜성장분위기를안정하게만들어줌으로써고품질의 SiC 단결정을얻을수있다는예측으로연구를진행하였다. 유체흐름과온도구배그리고탄소농도분포를알아보기위하여 CGSim TM (STR Group Ltd, Russia) 을이용한수치적시뮬레이션을진행하였다. 종자정으로는 2인치의 4 off-axis 4H-SiC, C-face 가사용되었고성장온도 1900 C 에서 5 시간동안성장이진행되었다. 성장된결정은성장률및결정내부의상태와성장후의도가니내부의관찰을위해광학현미경을사용하였고, polytype 와결함분석을위하여 Raman spectroscopy 가사용되었다. 결과적으로, 변형된도가니를사용한결정에서고품질의 SiC 단결정을얻을수있었다. P1-S16-11 Growth of Semi-insulating SiC using V-doped SiC Powder 바나듐이도핑된탄화규소분말을사용한반절연 SiC 단결정성장정은진 1*, 권용진 1, 정성민 1, 이명현 1, 최두진 2, 김영희 1. 1 한국세라믹기술원, 2 연세대학교 Recently, SiC is also known as a semiconductor substrate especially for power devices replacing Si for high-end application. Especially, SiC gained big attention for high-power microwave applications due to its superior properties compared to Si and GaAs, such as large bandgap, high electron velocity, high electron breakdown strength and high thermal conductivity. For this application, SiC substrate should be semi-insulating by reducing charge carriers stem from n-type / p- type impurities, such as N, P, Al and B. The semi-insulating SiC substrates could be produced by two different ways: reducing the impurities by purification or compensating the impurities by doping amphoteric dopant, especially V. In this study, V-doped SiC powder was applied to the bulk crystal growth of V-doped SiC. First, the V-doped SiC powder was prepared with direct carbonization method. Then SiC single crystal was grown with physical vapor transport (PVT) method using the synthesized V- doped SiC powder. The grown SiC ingot was investigated with high resolution x-ray diffraction, micro-raman spectroscopy and secondary ion mass spectrometry (SIMS) analysis. As results, we confirmed that the V concentrations in each wafers were relatively uniform, which suggested the V-doped SiC powder was effective to control the vaporization of V concentration in the grown crystals. P1-S16-12 Monolithic Two-color Emission of InGaN/GaN Multi Quantum Well Light Emitting Diode on SiC Substrate 이주형 *, 이준채, 신희진, 곽태명, 신은영, 이승아, 소병찬, 남옥현. 한국산업기술대학교 InGaN-based semiconductors have been grown on sapphire substrate, but the sapphire substrate has large mismatch with GaN (~16%). This lattice mismatch generates many dislocations and thereby deteriorates device performance. On the other hand, SiC substrate has small lattice mismatch with GaN (~3.4%) and high thermal conductivity (4.9 W/ cm k), so that it is suitable for high efficiency InGaN-based light emitting diode (LED). At present, phosphor conversion white LEDs are mostly used for general lighting. However, the phosphorconversion white LED has been shown the many demarits such as the discolorlation by phosphor-degradation and the high process cost. Therefore, it is necessary to develop the phosphor-free white LED (PF-WLED) which has simple in-situ process and robust property[1]. In this work, we have investigated mixed color InGaN/GaN multi quantum wells (MQWs) on SiC substrate to verify the feasibility for PF-WLED. Firstly, the three pairs of green quantum wells were grown at 720 o C on n-gan layer, and then the two pairs of blue quantum wells were grown at 750 o C on SiC and sapphire substrates by metalorganic 한국세라믹학회 139

160 2017 년한국세라믹학회추계연구발표회 chemical vapor deposition (MOCVD).The crystal quality and optical properties of the mixed MQW LED grown on SiC has been studied compared with that grown on sapphire. The detailed experimental results will be reported and discussed at the conference. [1] D. Min, D. Park, J. Jang, K. Lee and O. Nam, Sci. Rep. 5, (2015) P1-G2-1 Characterization of the Kinetic Properties of (La,Sr)- (Mn,Al)O 3 for Solar Thermochemical Fuel Production 태양기반의열화학연료생산반응에서 (La,Sr)(Mn,Al)O 3 물질의반응속도론적특성분석김연주 *, 김준규, 정우철. KAIST Synthesis of fuel gas by solar-driven two-step thermochemical reactions using metal oxide as an oxygen carrier is rising as an attractive technology to produce H 2, CO, and syngas, which can be sources to generate a transportable and dispatchable chemical fuel. Although CeO 2 (ceria) shows high performance in these reactions, extremely high reduction temperature (~1500 o C) to achieve proper amount of oxygen non-stoichiometry is impeding the reactor design and operation. To avoid this problem, perovskite oxides (ABO 3 ) have been investigated. In this study, we synthesized thin films of La 0.6 Sr 0.4 Mn 1-x Al x O 3 (LSMA) via pulsed laser deposition (PLD) and characterized their redox kinetics under relevant conditions (T = o C, po 2 = atm) using electrical conductivity relaxation (ECR) method. The values of the surface oxygen exchange coefficient (k S ) were obtained by analyzing relaxation profiles, and the redox kinetics of LSMA were studied with respect to temperature, oxygen partial pressure, and Al concentration in order to find the optimized materials composition and fuel production conditions. P1-G2-2 Characteristics of Mine Backfill by Utilizing of CFBC Coal Ash 순환유동층발전회를활용한광산채움재의특성조용광 1*, 남성영 1, 김춘식 1, 이용무 1, 서신석 1, 조성현 1, 이형우 1, 안지환 2. 1 한일시멘트, 2 한국지질자원연구원산업이발전함에따라석탄재의발생량은점점증가하고있다. 석탄재는미분탄연소방식 (Pulverized coal Combustion, PC) 과순환유동층보일러 (Circulating Fluidized Bed Combustion, CFBC) 에서발생된석탄재로구분할수있다. CFBC보일러는고체입자를유동화하여연소하는방식으로우수한연소효율과낮은환경부하의이점으로청정화력발전으로인식되고있으며그결과전세계에서차지하는비율은점차증가하는추세이다. 그러나 PC석탄재와달리 CFBC석탄재를건축재료로서활용할경우 F-CaO에의해급격한발열과균열이발생되며, 과량의 SO 3 성분에의해부피팽창우려가있어활용이제안되어왔다. 따라서 CFBC석탄재의새로운용도에대한연구가활발히진행되고있으며, 그중광산채움재는 CFBC석탄재를활용할수있는유망한기술분야로대두되고있다. 국내에는가행광산과휴 폐광산을합하여 5,000개이상의광산이있으며, 그중지하공동이존재하는광산은 2,000개이상으로추정되고있다. 지하공동의존재는지반침하및붕락, 산성침출수에의한토양오염등의경제. 사회적인피해를발생시키고있다. 이에본연구에서는 CFBC보일러에서배출되는석탄재를탄산화시켜제조한비산재와바닥재를활용하여광산채움재를개발하고그특성을연구하였다. 본논문은환경부글로벌탑환경기술개발사업중유용자원재활용기술개발사업 ( 과제번호 : ) 의지원에의하여연구되었으며이에감사드립니다. P1-G2-3 Preparation & Characterization of Plasma-sprayed Gadolinia-doped Ceria as a Electrolyte Substrate 용사코팅법으로만든 GDC 기판의전해질특성분석손찬진 1*, 임지원 1, 문흥수 2, 김진욱 2, 송선주 1. 1 전남대학교, 2 ( 주 ) 세원하드페이싱 Fully stabilized ceria doped 10% of gadolinia was synthesized by solid state reaction method and deposited as a thick film by plasma spray coating. The crystal structure and phases developed were characterized by X-ray diffraction (XRD). The surface structure, surface morphology and microstructure developed were studied by scanning electron microscopy (SEM). The plasma sprayed GDC was characterized for its electrolytic properties by ac and dc conductivity measurements. The maximum conductivity for plasma sprayed GDC was found to be Scm -1, which was lesser than the conductivity of standard GDC of Scm -1 at po 2 =0.21 atm. However; conductivity trends in the arrhenius plot was observed to be similar for entire GDC s suggesting that the conductivity mechanism is same and dominated by oxygen ion conductivity independent of oxygen partial pressure. These promising electrolytic properties of thermal sprayed GDC suggest that the thermal spray coating method may lead to be used as a potential method for the fabrication of NOx sensor. P1-G2-4 Synthesis of High Lithium ion Conducting NASICON/ Glass Composite Electrolytes 고리튬이온전도성 NASICON/Glass 복합고체전해질합성윤근영 *, 이은정, 황해진. 인하대학교리튬이온배터리는산화물계양극과유기계액체전해질을사용한다. 이때액체전해질의이온전도도는 10-2 S/cm 2 의높은값을가진다. 하지만액체전해질의누수및분리막의파괴로인한쇼트로화재및폭발사고가발생함에따라안정성에대한문제가항상제기되고있다. 그렇기때문에화재및폭발을예방하고높은용량의배터리제작이가능한고체전해질에대한연구가진행중에있다. 고체전해질을상용화시키기위해액체전해질과비슷한높은이온전도도와리튬음극과의반응이없는소재의개발이필수적이다. NASICON 계열의세라믹스는리튬이온전도도가높고수분과대기중에서안정적인장점을가진소재로서차세대고체전해질로주목받고있다. NASICON 계리튬이온전도성소재중에서 LiZr 2 (PO 4 ) 3 (LZP) 는리튬금속과의반응이없고안정하지만리튬이온전도도가낮고소결이어려운단점때문에상용화의걸림돌이되고있는실정이다. 또한 LZP는상온에서 triclinic상이안정적이지만, 60 o C 이상으로가열할경우 rhombohedral상으로상전이하게되며 triclinic 상과 rhombohedral 상의이온전도도는상온에서각각 S/cm 2, S/cm의전도도를가진다. 본연구에서는 Zr 대신 Y를치환하여상온에서 rhombohedral 구조를안정화하고리튬이온전도성을갖는 lithium borosilicate 유리를 LZP에복합화함으로써소결밀도를높이고이온전도도를향상하고자하였다. P1-G2-5 Study on the Characteristic of Liner and Cover Material by Accelerating Agent 급결제에따른광산차수재의특성연구 140 한국세라믹학회

161 포스터발표 I 조용광 1*, 남성영 1, 김춘식 1, 서신석 1, 조성현 1, 이형우 1, 안지환 2. 1 한일시멘트, 2 한국지질자원연구원현재폐광산의지하공동에의해발생되는지반침하및붕락등을방지하기위해광산채움재에대한연구가현재활발히진행되고있다. 하지만채움재의경우토양오염등 2 차적인환경문제를일으킬수있다. 이러한문제를해결하기위해채움재를시공하기전에차수층을설치하여유해물질이주변환경으로이동하는것을차수층의두께와투수속도로예측되는기간동안지연시켜환경적인문제가발생되지않도록하고있다. 하지만차수재의경우낮은투수성과더블어시공후급결성능을가져야하며급결성능이저하될경우다량의리바운드함량에의해작업효율성과경제적인문제가발생될수있다. 하지만현재급결제의종류및특성을고려하여차수재에적용한연구는부족한실정이다. 급결제의역할은시멘트, 콘크리트에첨가하여수화반응을촉진시켜응결및경화속도를현저히짧게하는재료이다. 하지만급결제를과량첨가할경우급격한물성저하를가져올수있으며소량첨가할경우급결성능이떨어지기때문에급결제의함량조절이중요하다. 따라서본연구에서는광산차수재를개발하고급결제의종류및함량에의한급결성능과물성에대해평가하였다. 본논문은환경부글로벌탑환경기술개발사업중유용자원재활용기술개발사업 ( 과제번호 : ) 의지원에의하여연구되었으며이에감사드립니다. P1-G2-6 Titanium Sub-oxides, TiO 2-x (x = 0, 0.2, 0.25, 1), as an Alternative for Li-ion Anode 리튬이온전지용타이타늄산화물음극재연구 Beyene Anteneh Marelign *, Brindha Moorthy, 공정훈, 김도경. KAIST Extensive researches are being carried out worldwide to replace the energy obtained from fossil fuel by renewable energy sources due to environmental concerns. Renewable energy sources (sun, wind, tide e.t.c.) are intermittent in nature; thus, efficient energy storage mechanism should incorporate with them for convenient utilization. Lithium ion batteries have successfully been used as energy storage devices in portable electronics for the past few decades. However, there are still unresolved issues (like safety, cost, capacity e.t.c.) for large scale energy storage applications. The safety issue is associated with the low lithiation potential and corresponding SEI layer and lithium dendrite formation of the widely used graphite anode; which in turn can cause thermal runway and consequent fire break out especially when operated at high rate. Efforts have been made to replace the graphite anode with other intercalation material. Different studies have demonstrated TiO 2 based anodes as a good candidate for replacing graphite. However, their poor electronic conductivity need to be addressed to fully utilize their potential as anode. Here we demonstrated reduced form of TiO 2 as an alternative anode for Li-ion battery. The electronic conductivity is enhanced to a large extent by the reduction process but as the expense of structural change. We investigated the optimum degree of reduction which gives a better performance. P1-G2-7 BiFeO 3 Nanoparticles as Anode Material for Sodiumion Battery 나트륨이온배터리음극재료용 BiFeO 3 나노입자 Brindha Moorthy 1*, Kamala Bharathi 2, Do Kyung Kim 1. 1 KAIST, 2 SRM University Sodium ion batteries have been considered as an alternative to lithium ion batteries in large-scale energy storage applications owing to the low cost. Here, we report on synthesis and possibilities of utilizing BiFeO 3 (BFO) nanoparticles as an anode component for sodium (Na) ion batteries. XRD and Raman spectroscopy measurements shows that as synthesized BFO exhibits rhombohedral distorted perovskite structure. Cyclic voltammetry (CV) reveals that conversion redox mechanism takes place at first discharge and subsequently two alloying process. BiFeO 3 nanoparticles with alginate binder delivers initial capacity around 650 mah/g and gradually decreases to ~200 mah/g at 100th cycle at 0.1 C rate. The conversion reaction mechanism during the electrochemical reaction in BiFeO 3 is probed by combining ex-situ XRD and XPS measurements after electrochemical cycling. High initial capacity of BiFeO 3 gives an indication that it can be utilized as an anode component for Na ion batteries after stabilizing the capacity fading. P1-G2-8 Electric Potential Measurement on All-Solid-State Batteries using an Embedded Reference Electrode 최한울 *, 임형태. 창원대학교 Three-electrode setup is used to measure working electrode potential with respect to reference electrode. A reference electrode is utilized to understand reaction mechanism of single electrode (working electrode). Three-electrode cell is universally used in lithium ion batteries based on liquid electrolyte, whereas this kind of analysis has not been applied for all-solid-state batteries. The electrochemical performance of solid state batteries is inferior because of high interfacial resistance between solid electrolyte. Thus, it is important to in-situ measure the working electrode potential and interfacial resistance between electrode and electrolyte, in all-solid-state system. In the present sturdy, we fabricated all-solid-state batteries consisting of Li 2 S-P 2 S 5 solid electrolyte, lithium silicide anode and TiS 2 cathode, with Pt reference electrode embedded in the solid electrolyte. The voltage between the anode/reference electrode and the cathode/ reference electrode were measured using Pt probe under open circuit condition and as a function of current density (C-rate). P1-G2-9 Aluminum-Air Batteries Capable of Shape-Reconfiguration 형상재구성가능알루미늄공기전지최상진 *, 이대희, 김광묵, 이윤연, 김보경, 문주호, 심우영. 연세대학교 The battery shape is critical limiting factor affecting foreseeable energy storage applications. In particular, deformable metal air battery systems could offer a low cost, low flammability, and high capacity, but the fabrication of such metal air batteries remains challenging. Here, we show that a shape-reconfigurable materials approach, in which the deformable components composed of microand nanoscale composites are assembled, is suitable for constructing polymorphic metal air batteries. We adopt an aluminum air battery cell as an ideal platform, which involves three-electron transfer during charging reactions; as a result, it provides a specific capacity that rivals that of a single-electron lithium-ion battery. The resulting battery can endure significant geometrical distortion such as three- 한국세라믹학회 141

162 2017 년한국세라믹학회추계연구발표회 dimensional stretching and twisting while the electrochemical performance is preserved. This work represents an advancement in deformable aluminum air batteries using the shape-reconfigurable materials concept, thus establishing a paradigm for shapereconfigurable batteries with exceptional mechanical functionalities. P1-G2-10 Charaterization of Polymer Coated Si Nanosheets as Anode Materials for Li ion Batteries 폴리머코팅된실리콘나노시트의리튬이온전지음극재특성박정민 *. 연세대학교 Lithium ion batteries (LIBs) have been used as energy storage systems in many electronics applications. The development of LIBs requires developing electrodes with a high energy density and durable structures. Regarding this, Si has a large theoretical capacity of 4,200 mahg -1, which is a much larger capacity density than that of the commonly used carbon. In spite of its large capacity, Si has not been commercialized as an anode material for lithium battery systems because of its poor cyclic retention. Two dimensional (2-D) nanostructures also have advantages and a large surface area to volume ratio with excellent stress relaxation. Hence, because of these advantages, 2-D Si nanosheets (SiNSs) can be a new candidate for high energy density materials for LIB systems. However, their electrochemical properties have not been studied intensively. Also, the volume expansion during lithiation/delithiation was occured the elimination of the host material between to the substrate. In this study, the polymer coated Si NSs electrodes were fabricated by spin-coating process. The polymer was used 2 ~ 4 % CMC power solution in D/I water. The CMC solution was dispersed on grown Si NSs electrode using spin-coater with 500~1500 rpm for 1 min. The CMC coated Si NSs have heat treatment for 8 h at 40 o C in a vacuum oven. Half-cell tests were carried out for investigating electrochemical properties. The cells were subjected to galvanostatic cycling using Battery Charging-Discharging system between to 2.0 V at C/10 rate. P1-G2-11 Delineating the Role of PbO 2 Nanoparticle Size in Aging for Lead Acid Battery 납축전지의노화에대한 PbO 2 나노입자의효과분석진단아 *, 심우영. 연세대학교 The lead-acid battery is the most commonly used battery because it is cheaper than newer technologies and has high power-to-weight ratio. This feature makes lead-acid batteries attractive for use in motor vehicles to provide the high current required by automobile starter motors. However, its low charge efficiency of ~50% limits the cycle life of the battery. This has led to extensive studies into the aging mechanism with a view to enhancing the charge efficiency. Sulfation is a major cause of aging in the lead-acid battery, which is partially reconverted back to an electrochemically active form resulting in a corresponding loss of capacity. In this study, we developed a unique nanoparticle strategy that can suppress sulfation. This enhances the reversible phase transition between PbSO 4 and PbO 2 and potentially allows the batteries to be operated with an enhanced lifetime. Our results suggest that control over the size of PbO 2 nanoparticles is critical to the aging mechanism. Large PbO 2 nanoparticles suppress sulfation, which leads to the nearcomplete reversible phase transformation from PbSO 4 to PbO 2. This approach addresses one of the significant challenges for realizing a high cycle life, while improving the mechanical stability and shedding, which are also correlated to battery life. P1-G2-12 Coating Behavior and Oxidation Resistance of Graphite Fiber Coated with SiC Using Silica Sol 실리카졸을이용하여탄소섬유에코팅한 SiC 코팅막의코팅거동및내산화특성안수빈 *, 방정원, 이윤주, 신동근, 김영희, 권우택. 한국세라믹기술원 In this study, SiC was coated to improve the oxidation resistance of carbon fiber composite used as an insulation material. The SiC coating film was formed by reaction between silica and carbon fiber surface, and two type of silica sol which are hydrosol and organosol is used. The SiC coating film is formed through two reactions between silica and carbon. First, a SiO gas is generated and SiC is formed by the reaction between the gas and the remaining carbon. In particular, it is important to control the amount of oxygen in the silica to minimize damage to the carbon fibers after coating. The coating behavior of SiC/C composite was analyzed with FESEM and XRD, and oxidation resistance properties were checked by weight loss method in an air atmosphere of 400 C. As a result, SiC coating with silica sol improved oxidation resistance. P1-G2-13 Selective Mixed-potential NO 2 Gas Response Performance of p-type NiO and CuO Nanostructure for Comparatively Low Operating Temperature 저온작동형 p-type NiO와 CuO nanostructure의선택적인혼합전위형 NO 2 가스반응성능 Chandran Balamurugan *, 손찬진, 홍재운, 송선주. 전남대학교 We have designed a solid-state electrochemical gas sensing electrodes based on nickel oxide (NiO) and copper oxide (CuO) nanostructure for selective detection of NO 2 at comparatively low temperature by using different weight (wt) percentage (%) of a doped noble metal oxide such as Pd, Pt and Ag. Of the compare to the planer oxide sensing electrode, the combination of the different wt% noble metal based composite electrode was found to be a high and fast response to NO 2 gas. The optimized sensor electrode response was studied continuously with an NO 2 concentration in the range of 1 to 100 ppm. The observed EMF values are varied linearly with the NO 2 gas concentration in an air reference with a fast response and recovery time. The effects of noble metal introduction on the electrodes are discussed based on the NO 2 response. Furthermore, the optimized sensing electrode shows excellent stability and repeatability with successively repeated cycles of exposure to NO 2 gas with an optimum operating temperature. In addition, to modify the surface morphology of the electrode, we prepared various vol wt% pore performer mixed sensing electrodes. The obtained porous electrodes are shows better gas response characteristics both in terms of speed and response owing to the higher porosity. Finally, the effect of electrode subtracts porosity and NO 2 gas response and recovery times were discussed. 142 한국세라믹학회

163 포스터발표 I P1-G2-14 Study of Anti-corrosion Methods for Boiler Systems by Designed Equipment 고안한장비를통한보일러시스템의내부식방법들에대한비교연구방정원 *, Minh Dat Nguyen, 안수빈, 김수룡, 김영희, 권우택. 한국세라믹기술원 The corrosion at high temperatures of boiler systems has been a big problem on various industrial fields. The main causative factors of corrosion in the boiler systems were high temperatures and specific gas environments (for example, chlorine gas). Many researchers have concentrated materials and methods to inhibit and control corrosion phenomenon, however studies of estimation and comparison of the anti-corrosion methods were rare. In this study, we designed equipment to evaluate anti-corrosion methods on the unique temperature and gas conditions of boiler system. Most boiler systems have two different temperatures at the inside (~500 C) and outside (~800 C) of boiler tubes due to steam generation at inside of tubes. By using this equipment, we studied not only anti-corrosion methods (ceramic coating, silica taping, plasma coating, high velocity oxygen fuel coating and overlay Inconel welding), but also corrosive effects of chlorine gas. The results revealed the corrosion mechanisms on the surface of boiler tubes. In addition, we estimated the remaining life of the boiler tubes on these anti-corrosion methods from the results by FE-SEM, EDS and weight loss method. P1-G2-15 Synthesis of CuSbS 2 and CuSbSe 2 Nanocrystals for Solar Material: Crystallographic and Optical Properties 태양전지재료 CuSbS 2 와 CuSbSe 2 나노크리스탈의합성 : 그결정학적및광학적특성박보인 *, 이도권, 이승용. 한국과학기술연구원 CuSbS 2 (CAS) and CuSbSe 2 (CASe) nanocrystals (NCs), which are earth-abundant materials, were simply synthesized by mechanochemical synthesis method. Only pure precursors such as copper, antimony, sulfur, and selenium were used without any organic solvents and also no additional chemicals. the NCs were synthesized within a short time and sudden phase changes were occurred by selfignition and propagation as the mechano-chemical properties. XRD, Raman, and TEM analysis were carried out to determine the crystallinity and secondary phase of synthesized CAS and CASe NCs. Optical properties was investigated by UV-Vis spectroscopy and it was observed that the band gap was about 1.0 and 1.5 ev. CAS CASe colloid dispersed in only anhydrous ethanol was prepared and coated on Mo substrate by facile doctor blade coat method. without Additional post-treatment, CAS and CASe NCs for solar material were perfectly obtained without secondary phases. P1-G2-16 A Novel Approach for High Performance Lithium Ion Batteries Fabricated by Additive Manufacturing 박수진 *. 재료연구소화석에너지를대체하기위한리튬이차전지는스마트기기와같은소형전지부터드론, 전기차및에너지저장시스템과같은중대형전지까지다양하게활용되고있다. 하지만리튬이온배터리의적용범위가넓어지는만큼기존공정의한계점또한부각되고있다. 일반적으로리튬이차전지의전극제조공정에서용매로사용되는 N- methylpyrrolidone (NMP) 는인체에유해하며환경오염을일으키는물질이다. 이러한 NMP 를대체하기위해수계용매를사용하는등다양한연구가진행되었지만아직 NMP 를완벽히대체할수있는적합한용매를찾지못해현재까지 NMP 를사용하고있는실정이다. 뿐만아니라기존 tape casting 공정방식은복잡한형상또는멀티소재의전극프린팅에적합하지않다. 이러한문제점을해결하기위해본연구에서는 3 차원적층방식을전극제조공정에적용하기위한연구를진행중이다. 전극의 3D 프린팅을통해정교함이요구되는마이크로배터리부터리튬이온이동경로를고려한이상적인구조및멀티소재의전극적용까지가능하게함으로써고출력, 고용량배터리를구현하고자한다. P1-G2-17 Preparation and Properties of Epoxy Composite with Modified Boron Nitride for Non Solvent Blendin 건식혼합을위해표면처리된질화붕소를첨가한에폭시복합체제조및특성문소윤 *, 임형미. 한국세라믹기술원 Heat dissipation for electronic and powered devices has been considered more attention due to high density package. The polymer composites are expected to substitute metal because of light weight, low cost, anti-corrosive, good process, etc. Development of thermal conductive polymer composite may increase performance stability, thermal stability, reliability, and increase of life time in the application of polymer composites. The polymer composites are composed of polymer resin and fillers, such as metal, ceramic, or carbon, however, metals are heavier than other two kinds of fillers, and carbon has high thermal conductivity but at the same time high electric conductivity. Therefore, the electrically insulative and thermally conductive polymer composites will come true through ceramic fillers of oxides or nitrides. Epoxy treated boron nitride was obtained in order to increase of thermal conductivity. The surface properties epoxy treated boron nitride were evaluated with FT-IR and wettability. The thermal properties of epoxy treated boron nitride and epoxy composite were performed using TGA and LFA P1-G2-18 Comparison of Characteristic of δ-al 2 O 3 Nano-fluids Produced by Sonication and Nano-disperser 나노디스퍼저와초음파분산장치를사용해제조한나노유체의특성비교최임주 1*, 서한결 1, 최태종 2, 장석필 2, 정대수 1, 임형미 1. 1 한국세라믹기술원, 2 한국항공대학교나노유체는기존열전달유체에열전도도가높은나노입자들을분산시켜열전달효율을상승시킨유체이다. 나노유체제조는 onestep method와 two-step method가사용되며, one-step method의경우고진공챔버를사용해나노입자의형성과동시에분산시키는기술로균일한입자크기와분산안정성이우수하지만진공챔버사용에따른고비용및공정시간이긴단점을갖고있다. two-step method의경우나노입자제작단계와분산단계를분리한방법으로, 초음파분산장치를사용해나노입자를기존열전달유체에분산시키는공정이다. 공정이비교적단순하지만입자응집및침전이쉽게발생하고입자크기제어가어려우며대량생산에한계가있다. 본연구에서는 two-step method의단점을해결하고입자크기제어기술및대량생산에용이하며우수한열물성을가지는나노유체를제조하고자하였다. 나노유체제조시우수한열전도도 한국세라믹학회 143

164 2017 년한국세라믹학회추계연구발표회 를가지는 Al 2 O 3 나노입자를사용했으며초음파분산장치와나노디스퍼저를이용해나노입자의분산시간및분산안정성을비교하였고, 원심분리공정을이용해입자크기를제어하여열전도도가우수한나노유체를제조하였다. 제조된나노유체의입자크기, 점도, 분산안정성, 열전도도를 PSA, 회전점도계, Turbiscan, 비정상열선법을사용하여평가하였다. P1-G2-19 Production and Electrochemical Characteristics of Activated Bio-carbon for Electrochemical Double Layer Capacitor (EDLC) 전기이중층커패시터 (EDLC) 를위한바이오활성탄의제조및전기화학적특성확인김용일 *, 백정훈, 김종휘, 윤하나, 이찬우, 유정준. 한국에너지기술연구원 EDLC는높은충방전효율과매우신속한출력응답특성을지니며, 우수한내구성으로반영구적인수명특성을가지고있다. 특히친환경적인소재를사용함으로써, 최근문제가되는환경오염적인문제에서도자유로울수있다. 이러한EDLC에적용되는대표적인활물질인활성탄은발달된세공구조를갖는무정형탄소로서, 빠른충방전, 장수명, 친환경, 광범위한작동온도조건등을가져야하는전기이중층커패시터의전극활물질로많이사용되고있다. 특히, 활성탄을제조하는출발물질의경우활성탄의크기나형태, 불순물함유량등을결정하는중요한요소로써, 현재상용되고있는활성탄은주로야자각, 톱코크스, 피치, 레진등을원료로하여제조되고있었으나, 최근환경적인요소로인해바이오물질이주목받고있다. 본연구에서는바이오물질인 Starch를출발물질로활용하여, 수열합성법과화학적활성화를위한 KOH용액진공함침등의방법을이용하여고순도의활성탄을제조하였으며, 그에따른물리적특성과전기화학적특성을확인하였다. P1-G2-20 A Study on the Morphology and Cathode Efficiency of Recovered Silver from Solar Cell with Variation of Current Density and Electrolyte Concentration 전류밀도와전해질농도의변화에따라태양전지로부터회수된은의형상및음극효율에관한연구이준규 *, 이진석, 안영수, 강기환. 한국에너지기술연구원일반적으로태양광모듈은유리, 알루미늄프레임, 태양전지, 봉지재및백시트로구성되어있다. 모듈을구성하고있는재료중태양전지에는소량의은이포함되어있는데이를효율적으로폐태양광모듈에서회수하는것은경제적인관점에서매우중요하다고할수있다. 본연구에서는태양전지에포함되어있는은을전기화학적으로회수하는동시에고순도화하는연구를진행하였다. 회수된은의형상과음극효율은전류밀도와전해질의농도변화에의존하였는데, 전류밀도가증가될수록전착된은의형상은입자상에서수지상으로변하는것을알수있었다. 반면, 음극효율은전류밀도가낮을수록, 전해질농도가높을수록증가하는경향을보이는것을확인하였다. 최종적으로높은음극효율을갖는고순도의은을회수하기위한임계전압을계산하였다. P1-G2-21 Environment Recovery and Purification of Silver from Solar Cell using Organic Acid 태양전지로부터유기산을이용한은의친환경적인회수및고순도화 김정훈 *, 이진석, 안영수, 강기환. 한국에너지기술연구원최근태양광산업의발전이급증함에따라서수명이다한폐태양광모듈의발생또한급증하고있다. 이러한이유로폐태양광모듈을재활용공정에적용하고유용소재를회수하는연구가활발하게진행되고있다. 태양광모듈을구성하고있는소재중에은을회수하는연구는크게진행되지않았는데이는태양광모듈에서은이차지하는비율이매우낮기때문이다. 하지만, 은은각종산업에서중요한재료로사용되고있으며, 태양광모듈을구성하고있는재료중은이차지하고있는가치는거의절반에가깝기때문에태양광모듈에서은을효율적으로회수한다면경제적으로큰가치를창출할수있다. 본연구에서는태양전지전면전극으로활용되고있는은을친환경적으로회수하기위해서유기산을이용한습식제련공정을진행하였다. 유기산과산화제의비율에따라은의침출거동을확인하였으며, 침출된은은화합물의형태로침전및환원반응을통해서회수하였다. 회수된은은전기화학적인공정을통해서고순도화되었으며, 최종적으로회수된은의순도는 4N 이상이었다. P1-G2-22 Synthesis and Electrochemical Characterization of Hyrogen Storage Oxides using V 1-x Ti x O 2 Oxide Systems V 1-x Ti x O 2 를사용한수소저장산화물의합성및전기화학특성분석김정현 *, 김미경, 송선웅, 정기채. 한밭대학교수소는공해를배출하지않는친환경적인에너지원으로대두되고있다. 하지만현재사용하는수소저장법중고압탱크저장법은체적당수소밀도가낮아효율이낮고, 액화수소저장법은장기보관시손실및특수단열용기가필요하다는단점이있다. 따라서이러한단점들을보완하는안정한수소저장방법이필요하다. 본연구에서는수소저장산화물로적용이가능한 VO 2 를기반으로 V를 Ti로부분적으로치환한수소저장산화물 V 1-x Ti x O 2 (x = 0.1, 0.3, 0.5, 0.7, 0.9) 을합성하여미세구조와전기화학특성을분석하였다. P1-G2-23 Phase Synthesis and Electrical Conductivities of Vanadium and Chromium Oxide Systems for Hydrogen Storage 수소저장을위한 Vanadium 및 Chromium 산화물합성및전기전도도특성김정현 *, 박교리, 송선웅, 정기채. 한밭대학교수소는무게대비에너지가높고발화가용이하다. 또한사용후환경오염물질을배출하지않아친환경에너지원으로각광받고있으나, 단위부피당에너지밀도가매우작다는문제점이있어상용화를위해서는효과적인수소저장기술이요구되고있는상황이다. 주로금속계열의수소저장물질에대한연구가진행되고있으며수소저장합금이외의다양한방면의연구는미비한상태이다. 반면수소는터널격자구조를가지고있는 Vanadium Oxide의빈공간에들어가전자구조상태를변화시킬수있으며백금나노입자와결합시킨 Vanadium Oxide 박막을만들어단위격자에최대 2개의수소원자를흡착하거나탈착할수있다는최근연구결과가존재하며, 이를바탕으로수소저장문제를다방면으로해결하기위해본연구그룹에서는 VO 2 산화물을이용한수소저장물질에대한연구를진행하고있다. 본연구에서는 Vanadium Oxide와 Chromium Oxide를이용하여산화물을합성하여결정구조특성을분석하였다. 또한합성된산화물을이용하여 Air분위기및 H2 분위기에서의전기화학특성을분석하였다. 144 한국세라믹학회

165 포스터발표 I P1-G2-24 O3-NaMnO 2 /P2-Na 2/3 Ni 1/3 Mn 2/3 O 2 Composite Cathode for Sodium Ion Batteries 나트륨이온전지용 O3-NaMnO 2 /P2-Na 2/3 Ni 1/3 Mn 2/3 O 2 복합체양극이연우 1*, 변동진 2, 김창삼 1. 1 한국과학기술연구원, 2 고려대학교 P2-type Na 2/3 Ni 1/3 Mn 2/3 O 2 cathode for sodium ion battery has good cycle and rate performances in the working voltage range of V. There is little decrease in charge/discharge capacity as increasing the C-rate from 1 /30 to 1/5 C. Furthermore, the initial discharge capacity is maintained after a few hundred cycles. However, the discharge capacity of this P2-type cathode is 90 mah/g in the voltage range of V, which is only 52% of its theoretical capacity. If this P2-type material is charged to 4.5 V, the charged capacity reaches about 170 mah/g, but the discharge capacity rapidly decreases over cycles. The irreversible phase transformation from P2- to O2-type is the reason of the capacity fade. There have been reported several methods to suppress the phase transformation, such as transition metal substitution and surface coating. Here we report a O3-NaMnO 2 /P2- Na 2/3 Ni 1/3 Mn 2/3 O 2 composite cathode which has an improved reversible capacity. P1-G2-25 Volumetric Power Density Improvement of Metalsupported Solid Oxide Fuel Cell 금속지체형고체산화물연료전지체적전력밀도향상에관한연구이재석 *, 이건호, 배중면. KAIST 고체산화물연료전지 (Solid Oxide Fuel Cell, SOFC) 는고온 (600~1000 o C) 형연료전지로써대기오염물질배출이적어친환경적이며효율이높고다양한연료를사용할수있다는장점을기반으로차세대에너지원으로써각광을받고있다. 하지만고체산화물연료전지는모든층이세라믹물질로이루어져있어기계적 / 열적강건성이낮다는점때문에수송 / 이동분야보다는정치형발전분야에제한되어활용되고있다. 금속지지체형고체산화물연료전지 (Metal-supported Solid Oxide Fuel Cell, MS-SOFC) 는고체산화물연료전지지지층으로금속을도입함으로써낮은기계적 / 열적강건성을보완할뿐만아니라산화 / 환원사이클에강하며재료비가경제적이라는장점이있다. 금속지지체의제작방법중하나로 Ni, Al, Fe 등의금속분말을소결시켜다공성금속지지체를제작하는방법이있지만이경우높은온도의환원분위기에서니켈의조대화및철의확산과같은문제점이있다. 따라서본연구에서는높은체적전력밀도와경제적이점을위해얇은두께 (~100 µm) 의천공된금속지지체를적용하여금속지지체형고체산화물연료전지를개발하였으며개발된단위전지에대한형태학분석및전기화학성능평가를진행하였다. 또한얇은두께의연료극기능층을도입함으로써단위전지의전기화학적성능이성공적으로향상되었으며총 90% 이상의단위전지체적전력밀도향상이확인되었다. P1-G2-26 Development of Nickel Electroless Plating Process for Multiscale SOFC Anode Fabrication 멀티스케일 SOFC 연료극제작을위한니켈무전해도금공정개발강주현 *, 이건호, 유재영, 배중면. KAIST Solid oxide fuel cell (SOFC) is an electrochemical energy conversion device composed of ceramic components. It is one of the most efficient fuel cell systems which operates at high temperature ( o C), and it has advantages, such as low polluting gas emission and high energy and power density, compared to internal combustion engines. In anode of SOFC, fuel is oxidized and generates electrons. In these reactions, multiscale phenomena occurs on anode side. Fuel and electron transport through the micro scale support structure, and energy conversion reaction occurs at the interface of electrolyte and anode in nano scale domain. Therefore, many research groups are interested in the fabrication of multiscale SOFC anode for performance improvement. In this study, nickel electoless plating process was developed to fabricate multiscale SOFC anode. A microporous LSGM substrate was fabricated by screen printing on dense LSGM pellet, and then pure nickel particles were coated onto the LSGM substrate by nickel electroless plating process to fabricate Ni-LSGM half-cell. Then, area specific resistance (ASR) and electrochemical impedance spectroscopy (EIS) measurement were conducted to evaluate the electrochemical performance. As a result, the possibility of nickel electroless plating process for multiscale SOFC anode fabrication was confirmed. P1-G2-27 Hybrid Solid Electrolyte with the Combination of Ceramic and Ionic Liquid for Li-ion Batteries 리튬이온배터리를위한세라믹및이온성액체를이용한복합하이브리드전해질김현우 *. 울산과학기술원 Concerning the safety aspects of high-voltage Li-ion batteries, a pelletized hybrid solid electrolyte (HSE) generation of high-voltage pseudo-solid-state Li-ion batteries. use in pseudo-solid-state Li-ion batteries. The LLZO particles are enclosed by the ionic liquid as a LLZO ILE matrix, and are quantified by FESEM elemental mapping. The chemical stability of the LLZO in the ILE is confirmed by powder XRD and FT-IR analysis. The HSE, with an optimized weight ratio of 80% LLZO, 19% Py14TFSI, and 1% lithium bis(trifluoromethanesulfonyl)imide, exhibits good thermal stability, even at 400 C. The optimized HSE reveals an ionic conductivity of S cm1 and an electrochemical stability of 5.5 V with Li metal. Pseudo-solid-state Liion cells are fabricated using the HSE, and afford initial chargedischarge capacities of 140/130 ma h g1 (Li/HSE/LiCoO 2 ) with 99% capacity retention at the 150th cycle. The scope of the HSE is widened to high-voltage (> 8 V) pseudo-solid-state Li-ion batteries through a bipolar stacked cell design. Dendrite formation is hindered during cycling in the Li-ion cell. Hence, the present investigation will greatly contribute to the next generation of high-voltage pseudo-solid-state Li-ion batteries. P1-S23-1 Coupled Technology of CO 2 Utilization and CH 4 Conversion to Syngas through the Dual-phase Membrane 복합체산소분리막을이용한 CO 2 자원화및메탄변환합성가스동시생산연구박정환 *, 권영일, 강신명, 주종훈. 충북대학교지구온난화에의한환경문제가심화되어감에따라온실가스중가장많은비중을차지하는 CO 2 의배출량을감소시키기위한연구가활발히진행되고있다. CO 2 포집및저장기술이제안되었으나포집을위한공정및폐기처리등으로인한높은비용으로인해최근에는 CO 2 를직접 CO 등으로자원화하는기술이주목받고있다. 특히혼합전도성세라믹산소분리막은분리막양단에 CO 2 와 CH 4 을공급하여산소분압차이를형성하는것에의해 CO 2 로부터산소만선택적으로분리하는것이가능하여, 이를기반으로 CO 2 자원화및 CH 4 변환에의한합성가스 (H 2 +CO) 생산이동 한국세라믹학회 145

166 2017 년한국세라믹학회추계연구발표회 시에가능한장점을갖는다. 이러한장점에도불구하고세라믹산소분리막을기반으로한 CO 2 자원화및 CH 4 동시변환연구는매우미흡한상태이다. 본연구에서는분리막양단의기체변환반응에높은화학적 / 기계적안정성을갖는이온전도성형석구조 (AO 2 ) 산화물을기반으로페로브스카이트 (ABO 3 ) 산화물을전자전도성소재로혼합한복합체분리막을연구하였다. 복합체산소분리막의산소투과도및기체변환반응의선택성을향상시키기위해분리막표면에 Ruddlesden-Popper, Perovskite, fluorite 의다양한다공성활성층을코팅하였고, 각각의소재에따른산소투과도와생산된합성가스의 H 2 /CO 비율을확인하였다. 또한희석한기체분위기를이용한기존연구들과달리순수한 CO 2 및 CH 4 를이용하여실제공정분위기에서장기적인구동안정성을확인하였다. P1-S23-2 Elucidation of the Surface Exchange Kinetics in Dualphase Membrane by the Permeation Model 산소투과모델을통한복합체분리막의표면교환반응해석나범탁 1*, 박정환 1, 박종혁 1, 유지행 2, 주종훈 1. 1 충북대학교, 2 한국에너지기술연구원세라믹산소분리막기술은산소이온전도성산화물을사용해대기중으로부터순수한산소를분리할수있는기술이다. 최근이산화탄소저감문제를해결하기위해순산소연소 (oxy-fuel combustion) 가그해결책으로부상함과동시에종래의분별증류를통한순산소제조기술보다생산단가를크게낮출수있는산소분리막기술도함께주목받고있다. 형석구조산화물 (AO 2 ) 기반의복합체산소분리막은기계적, 화학적안정성이우수해분리막의상용화를목적으로많은연구가이뤄지고있다. 최근표면활성층코팅을통해복합체분리막의산소투과도가크게향상된다는사실이보고되었다. 하지만코팅층에의한복합체분리막의산소투과도향상메커니즘에대한연구는아직부족하다. 본연구에서는 La 0.6 Sr 0.4 CoO 3-δ 가코팅된 La 0.7 Sr 0.3 MnO 3 ± δ -Gd 0.1 Ce 0.9 O 2-δ (LSM 20 vol%/gdc 80 vol%) 복합체분리막양단의산소분압에따른산소투과도를측정하고이로부터산소공급면과투과면각각의표면교환반응계수를산소투과모델을통해저항의형태로계산하였다. 계산된표면교환반응계수로부터코팅층에의한복합체분리막의산소투과도향상메커니즘에대해고찰하고실제산소분리막작동분위기에서공급면과투과면의반응속도를비교하였다. P1-S23-3 Effect of Segregated Cation on the Ionic and Electronic Conductivity of Ruddlesden-Popper, Pr 2 NiO 4+δ 양이온의 segregation이 Ruddlesden-Popper, Pr 2 NiO 4+δ 의전기적특성에미치는영향강신명 1*, 김동영 2, 주종훈 1. 1 충북대학교, 2 삼성전자이온 - 전자혼합전도성세라믹소재들은산소분리막또는고체산화물연료전지 (Solid oxide fuel cell, SOFC) 의전극물질로써적용가능성이높아세계적으로연구의관심이집중되고있다. 대표적인물질로 La 1-x Sr x CoO 3-δ (LSC) 와같은 perovskite 계물질의전기적특성, 전극반응특성, 그리고표면반응기구에대하여연구가되어왔다. 최근들어, LSC의표면교환반응은양이온의 segregation에영향을받는것으로보고하고있고, 특히 SrO segregation에의해표면교환반응특성에변화가생긴다는것으로보고되고있다. 하지만 cobaltite 계 perovskite 물질의높은열팽창계수 (TEC) 및낮은화학적안정성, 열화현상으로인한장기안정성미확보등으로인하여전기화학적응용에제한이있다. 이러한단점을극복하기위해높은이온 - 전자혼합전도특성과화 학적안정을가지는 Ruddlesden-Popper 구조 (K 2 NiF 4 ) 의 Ln 2 NiO 4+δ (Ln = La, Pr, Nd 등 ) 가대체물질로고려되고있다. 특히 Pr 2 NiO 4+δ 는 Ln 2 NiO 4+δ 물질중에가장높은표면교환반응특성과높은확산계수를가지는것으로보고가되고있다. 본연구에서는 Pr 2 NiO 4+δ 의표면교환반응에대한 single oxide (PrO x 와 NiO) segregation 의효과를확인하기위하여 Pr 2 NiO 4+δ 와 PrO x, NiO 혼합체에대한상변화, 전기전도도, 산소투과특성등에다양한실험을통하여체계적으로연구하였다. 4-probe DC 방식으로측정한전기전도도는 600 o C 이상의고온에서 NiO 함량이증가함에따라증가하는거동을보였고, Pr 2 NiO 4 의 metal-semiconductor 전이온도 ( o C) 가 NiO 에의해 200 o C 이하로이동하는것을확인하였다. P1-S23-4 Synthesis and Coating Properties of Hydrophilic Coating Solutions using Alkali Silicates 알칼리실리케이트를이용한친수성코팅액합성과코팅특성김정현 *, 김영대, 송선웅, 정기채. 한밭대학교현대사회에서는대규모플랜트의요구가증가함에따라금속기반의구조물들이주로사용되고있다. 금속구조물들은장기간안정적인기계적특성의유지및부식방지를위해서다양한방법으로코팅처리를실시하고있으며본연구에서는알칼리실리케이트를이용하며친수성코팅액을합성하여적용하였다. 합성된코팅액을이용하여열처리온도및분위기에따른접촉각의특성을분석하여친수성으로판단되는최적조성을파악하였다. 동시에내식성및자가세정특성을분석하였다. P1-G3-1 Characteristics of Environment Barrier Coatings on Reinforced SiC Fiber Ceramic Composite 섬유강화 SiC 복합체의내환경코팅기술김지유 1*, 문흥수 1, 이기성 2. 1 ( 주 ) 세원하드페이싱, 2 국민대학교가스터빈의연소기라이너와같이높은고온과함께수증기와같은가혹한환경에서내구성을가져야하는세라믹스복합체를개발하는연구가활발하다. 세라믹스복합체만으로가혹한환경을견딜수없음에내고온코팅기술 (Thermal barrier coating) 과내환경코팅기술 (Environment barrier coating) 이개발되었다. 본연구에서는내환경코팅및내고온코팅에사용되는분말을개발제조하여 APS 코팅기술을사용하여코팅최적화를연구하였다. 또한모재와내환경코팅, 내고온코팅의접착력을높이기위한본드코팅층의분말개발및코팅최적화를연구하였다. 제작한시편의내구성을알아보기위해열내구성평가를실시하여평가분석하였다. P1-G3-2 Study on Synthesis and Characterization of N-doped TiO 2 Powder N도핑된 TiO 2 합성및물성평가연구유리 *, 이나리, 피재환, 안계석, 김유진. 한국세라믹기술원질소도핑된이산화티타늄 (N-doped TiO 2 ) 은환경 / 광촉매분야에서주목받고있는재료로써, 이번연구에서졸겔법을활용하여가시광응답형 N도핑된 TiO 2 를합성하였다. 출발물질로티타늄 (IV) 이소프로폭사이드 (TTIP) 와 NH 4 Cl 또는 NH 4 OH를이용하였고, 출발물질간농도비율및열처리온도를조절하였다. 합성된 N-doped TiO 2 는 XRD, TEM, UV, methylene blue test을이용하여결정구조, 형상, 반사율, 흡수율등의물성을평가하였다. 특히, 출발물질간의비율이높아질수록장파장대로쉬프트되는것을반사율을통 146 한국세라믹학회

167 포스터발표 I 해확인하였고, 흡수율을통해 methylene blue 가분해되는효과를흡수율을통해확인하였다. P1-G3-3 The Study on the Chromaticity Behavior of Iron-oxide based Inorganic Pigments according to Morphology of Coating Layer 코팅층형상에따른산화철기반무기안료의색도거동에관한연구안계석 *, 유리, 김유진. 한국세라믹기술원 The material of Iron-oxide takes center stage for inorganic pigment. Especially, the α-fe 2 O 3 and β-feooh represent for red and yellow pigment. Various types of coating layer have been reported implementing to increase chromaticity of the core inorganic materials. In this study, hollow type α-fe 2 O 2 and β-feooh@sio 2 nanoparticles were fabricated by treatment of SiO 2 shell with mild basic solution. Spindle shaped α-fe 2 O 3 and β-feooh nanoparticles were initially prepared as core materials and subsequently coated with silica via sol-gel method. The hollow structure core-shell particles were produced by dissolution of SiO 2 s hell with NH 4 OH. The morphology and coloration of each samples were investigated in detail by transmission electron microscopy (TEM), and CIE Lab color parameter measurements. P1-G3-4 Measurement of Effective Thermal Conductivity for Li 2 TiO 3 Pebble-bed using Laser Flash Method Laser Flash 방법을이용한 Li 2 TiO 3 페블베드의유효열전도도측정구덕영 *, 박이현, 이영민, 안무영, 김창석, 박순창, 조승연. 국가핵융합연구소증식블랑켓의설계건전성및성능예측을위해서는이를구성하고있는각종재료의물성자료가필요하며, 삼중수소증식재로사용되는 Li 2 TiO 3 페블에대해서는페블베드형태에서의유효열전도도값이반드시필요하다. 재료의열전도도를측정하는방법으로는 Hot Wire, Hot Disc, Laser Flash 방법등이있으나, Laser Flash 방법은다른측정법과비교하여상대적으로측정온도의범위가넓으며, 뛰어난정확성및재현성을가지고빠른시간내에샘플의열전도도를측정할수있는장점이있다. 따라서본연구에서는 Laser Flash법을이용하여 Li 2 TiO 3 페블베드의열전도도를측정하기위한샘플홀더를개발및검증하였다. 일반적인 Laser Flash 측정장치는디스크형태의샘플을측정할수있도록샘플홀더가설계되어있기때문에, 페블베드의유효열전도도를측정하기위해서는새로운샘플홀더의설계가필요하다. 본연구에서개발한샘플홀더는컨테이너, 측면링및하부디스크로구성되어있다. 페블을담을수있는컨테이너는그라파이트를이용하여제작되었으며, 측면링및하부디스크는샘플로흡수되는열이그라파이트컨테이너로전달되어손실되는것을최대한막기위해퀄츠를이용하여제작되었다. 또한본연구에서개발된페블베드의열전도도측정용샘플홀더는상온뿐만아니라고온에서도안정적으로열전도도를측정할수있도록설계되었으며, Li 2 TiO 3 페블베드를이용하여상온에서부터 800 o C까지의유효열전도도를측정함으로써이에대한검증을완료하였다. P1-G3-5 Synthesis and Properties of Spherical Silica Aerogel Powders by Emulsion Polymerization from Water Glas 구형실리카에어로겔분말의합성및응용이경진 *, 정현아, 황해진. 인하대학교 실리카에어로겔은우수한단열성능을가진차세대단열소재로알려져있으며, 구조적특성으로인하여초단열, 초경량, 초저유전성방음성등의특별한특성을갖게되어투광성단열재나차세대신소재로의활용가능성이매우높은소재로기대되고있다. 하지만현재까지도에어로겔의높은제조비용은상용화되는데가장큰방해요인이되고있다. 따라서. 본연구에서는상용화를가로막는고가의공정비용, 시간등을제어하여저비용으로단시간에고품질의구형실리카에어로겔을제조하고자하였다. 에멀젼합성법을이용하여안정적으로실리카에어로겔분말을제조하고공정시간을 2 시간이내로단축하여우수한특성을가지는구형의실리카에어로겔을제조하는연구를진행하였다. 그결과구형의실리카에어로겔의제조공정은액적의형상을제어함으로써실리카에어로겔의형상도제어가가능하다는것을알수있었으며. 공정시간은표면개질공정시간을성분, 온도등의조건을변화시켜단축시킴으로써총공정시간을 2 시간이내로단축시킬수있었다. 또한, 균질한구형의분말을형성시키기위해균질기등으로에멀젼의액적을제어하였으며 Na 0.1% 이하의높은순도로고품질의구형실리카에어로겔을제조할수있었다. P1-G3-6 Annealing Effects on the Optical and Adhesion Properties of DLC Films on Glass Substrate 유리기판에증착된 DLC 필름의광학및접착특성에미치는열처리효과이혁주 *, 임대순, 이응석. 고려대학교 Hydrogenated diamond like carbon (DLC) films were deposited on glass substrate using direct current (DC) magnetron sputtering. Deposited DLC films were annealed in temperature range o C using rapid thermal annealing (RTA). In this study, the optical and structural properties of hydrogenated DLC films on glass substrate were studied. Raman analysis was used to investigate the bonding structure of DLC films. As annealing temperature increased, the graphitization was promoted and sp 2 /sp 3 ratio increased slightly. The transmittance of hydrogenated DLC showed 70% with film thickness 100 nm in visible light region. However, after annealing over 400 o C, the transmittance of DLC films decreased rapidly. The adhesion property of DLC films was measured using scratch tester. The critical load showed over 85N except for annealing temperature 600 o C. Atomic force microscopy (AFM) were used to measure the surface roughness. In conclusion, optical and adhesion properties of DLC films can be understood by analyzing the bonding structure. P1-G3-7 Mechanical Strength of Reaction-bonded Silicon Carbides with Different Specimen Siz 반응소결탄화규소의시편크기에따른기계적강도김성원 1*, 이소율 1, 오윤석 1, 이성민 1, 한윤수 1, 김영석 2. 1 한국세라믹기술원, 2 ( 주 ) 이노쎄라반응소결탄화규소 (Reaction-bonded silicon carbide, RBSC) 는치밀체를제조하기위하여탄화규소와탄소로이루어진골격에용융실리콘을함침하여제조한복합세라믹스의한종류이다. 반응소결탄화규소는다른탄화규소속결체에비하여자유로운형상과비교적저온의열처리온도로인하여다양한응용분야에사용되어왔다. 본연구에서는래디언트튜브로사용하기위해원심캐스팅으로성형한탄화규소튜브를제조하였다. 반응소결탄화규소튜브를 한국세라믹학회 147

168 2017 년한국세라믹학회추계연구발표회 이용하여일반적인곡강도, C-ring 등다양한크기의시편에대하여기계적강도를평가하였다. 또한, 이러한다양한시편의강도간에있어 size scaling 을적용하고그유용성을고찰하였다. P1-G3-8 Phase Formation and Microstructure of SiAlON-based Ceramics for Cutting Superallo 초합금절삭공구용사이알론계세라믹스의상형성과미세구조김성원 *, 이소율, 최재형, 한윤수, 이성민. 한국세라믹기술원가스터빈고온부의금속부품에주로사용되는초합금 (Superalloy) 계소재는고융점, 고경도, 내산화성등의우수한특성으로고온구조소재로널리쓰인다. 초합금의고경도, 저열전도도특성으로인해일반적인금속소재에비해절삭가공이어려우며이소재를가공하기위한코팅초경, 세라믹스등다양한소재의절삭공구가개발되어사용되고있다. 특히초합금의절삭공구로사용되는세라믹스소재로는사이알론 (SiAlON), 알루미나휘스커 (Alumina- SiC Whisker) 복합체가있다. 본연구에서는이터븀산화물을소결조제로하여반응소결을통해제조된사이알론소재의상형성과미세구조에대해살폈다. 특히소결조제의양, Si/Al 비, 소결온도에따른알파 / 베타사이알론의형성거동과미세구조의특성을고찰하였다. P1-G3-9 서스펜션플라즈마스프레이를이용한 Ytterbium Disilicate 환경차폐코팅의제조 Fabrication of Ytterbium Disilicate Environmental Barrier Coating by Suspension Plasma Spray 류호림 *, 오윤석. 한국세라믹기술원우주항공및방위산업은고속화, 고성능화를통해급속히발전하고있다. 이에따라장비의고효율, 경량화, 내열성, 내부식성을갖춘복합소재의개발과그를유지하고보호할수있는기술이요구되고있다. 각광받는복합소재중 SiC 기반의 CMC(Ceramic Matrix Composites) 는초고온용소재로여러분야에관심받고있지만, 고온, 고압의환경에서발생하는물등의환경에노출되면화학반응에의해부식이발생하며재료의수명을단축시키고, 때론장비의구동을저해할수도있다. 이를방지하고고온, 고압의수증기환경에서기재를보호하여장비의수명을늘리기위해환경차폐코팅기술 (Environmental Barrier Coatings, EBC) 이필요하다. 본연구에서, EBC는 Coating층과기재간의높은부착력을위해 Bond coat와 Top coat로이루어진 Double layer Coating을하였다. 이때 Top Coat로는 Ytterbium Disilicate (Yb 2 Si 2 O 7 ) 을 Top Coat 로제조하고자한다, 그이유로는 Ytterbium Disilicate는기재인 SiC와열팽창계수가유사하며, EBC에서의주요특성인높은내산화성과내열성을가지고있다. 기판재는상용의소결된 SiC를이용하였고, Bond Coat는 SiC기판재와 Top coat 사이의열팽창계수를보이는실리콘 (Silicon, Si) 를사용하였다. EBC 제조방법으로는서스펜션플라즈마스프레이 (Suspension Plasma Spray, SPS) 방식을이용하여적용하였다. Ytterbium Disilicate를제작하기위해서 Yb 2 O 3 와 SiO 2 powder를일정비율로 Ball Milling 후하소 (Calcination) 1400~1500 o C 및 Planetary Milling 하여 Suspension을제조하고입자의입도분석후에증착하였다. 제조한 Ytterbium Disilicate 코팅층에대하여 XRD, SEM을통한결정상의확인과미세구조등을분석하였다. P1-G3-10 Analysis of Resistance Plasma of Y 2 O 3 and YF 3 Coating by Suspension Plasma Spray Method 서스펜션플라즈마스프레이코팅법을이용한 Y 2 O 3 및 YF 3 코팅막의내플라즈마특성분석김민숙 1*, 김경자 1, 박주석 1, 김경훈 1, 김형순 2. 1 한국세라믹기술원, 2 인하대학교 Thermal plasma spray coating 법은플라즈마를이용하여금속및세라믹등과같은원료를반용융또는용융상태로용사하는코팅법으로빠른속도로후막의제조가가능하다는장점을가지고있다. 기존의 thermal plasma spray coating 의경우에는원료의원활한투입을위하여 30~200 µm 크기의과립분말을코팅원료로사용하기때문에고융점의세라믹코팅시과립분말의미용융등의문제로인하여코팅막내부에큰기공이존재하여낮은코팅막밀도, 모재와부착력저하, 층상형태의미세구조형성등다수의결함이발생하여코팅막의특성이저하되는문제를가지고있다. 반면 suspension plasma spray coating 은과립분말대신 1~5 µm 크기의세라믹분말을용매에분산시켜 suspension 상태로원료를공급하여고밀도의코팅막제조와나노크기의미세구조형성이가능하기때문에기존의과립을이용한코팅법보다우수한특성의코팅막제조가가능하다. 본연구에서는반도체장비부품의코팅원료로널리활용되고있는 Y 2 O 3 와최근내플라즈마코팅원료로연구되고있는 YF 3 를서스펜션플라즈마스프레이법을이용하여코팅을진행하였다. 또한 Y 2 O 3, YF 3 를원료로한서스펜션플라즈마스프레이코팅을플라즈마저항성을평하기위하여 CF 4 플라즈마분위기에서한시간동안노출시킨후특성을분석하였다. P1-G3-11 Digital Light Processing of High Refractive Index Ceramics 넨코네노브 *. 재료연구소 Silicon nitride outperforms metals for a variety of applications as a result of high-temperature stability, low creep under high temperature and high stress conditions, oxidative resistance, thermal shock resistance, and wear resistance. Current methods for production of Si 3 N 4 parts include high-pressure sintering and are limited to simple shapes. Our work combines digital light processing (DLP) 3D printing with Si 3 N 4 superior properties to create complex 3D structures. The ink system for 3D printing used consists of Si 3 N 4 powder, resin monomers, photoinitiator, and dispersant. Higher Si 3 N 4 vol% ink is desirable for denser sintered body. However, the viscosity of the ink dramatically increases as solid loading of Si 3 N 4 is increased due to the low surface charge of the particles which start to agglomerate. Different organic resin monomers for the ink system were investigated including TMPTA, PPGDA, and HDDA to control processability of the ink system. Superior rheological properties of the ink are achieved with the HDDA monomer system. With customised DLP 3D printing set-up, ca. 50 vol% Si 3 N 4 ink is printed in various 3D shapes and successfully sintered as beta Si 3 N 4 3D structures. The relationship between the cure depth and the various factors affecting it is shown on the right as well as a graph of the cure depth of the Si 3 N 4 ink with a reference Al 2 O 3 ink, which has much higher cure depth due to the lower refractive index difference between photocurable resin and Al 2 O 3. P1-G3-12 Study on the Sintering Behavior of TiC Composite by Using Sintering Additive 소결조제첨가에따른 TiC 복합체의소결거동연구 148 한국세라믹학회

169 포스터발표 I 이삼행 1*, 안종필 1, 소성민 1, 박주석 1, 이광호 2, 이성갑 3. 1 한국세라믹기술원, 2 ( 주 ) 부일신소재, 3 경상대학교 Ti(C, N) 계서멧 (cermet) 은높은강도, 경도, 화학적안정성으로절삭공구와같은고기능성산업용부품으로사용되고있다. 최근서멧의 metalic color 를이용하여장식재산업으로의적용이확대되고있다. 하지만 TiC, TiN 은강한공유결합으로대표적인난소결성재료로알려져있고치밀한소결을위해서는소결보조재및고온의소결공정이요구된다. Ni, Cr 금속은서멧소결에서주로사용되는소결조제로알려져있지만인체유해성 ( 알러지반응 ) 으로인해장식재사용에있어제약이따른다. 본연구에서는 TiC 복합체의치밀한소결을위하여소결조제를첨가하였으며이에따른기계적특성, 미세구조분석을통해 TiC 복합체소결거동에관한연구를진행하였다. P1-S33-1 Effects of Encapsulation in Healing Agent on Crack Resistance of Self-Healing Thermal Barrier Coatings 치유재의캡슐화에따른자가치유열차폐코팅의균열저항성에미치는영향전수혁 *, 이승수, 정성훈, LYU GUANLIN, 박현명, 정연길. 창원대학교열차폐코팅 (TBCs) 은가스터빈고온부품인베인, 블레이드, 연소기등에적용되어고온부품의열화방지와모재의온도수용성을높여주고있다. 그러나, 가스터빈의효율향상과대형화에따라터빈입구온도는점차상승되고있어 ( 현재 1600 o C까지상승 ) 기존열차폐코팅에사용하고있는이트륨이첨가된안정화지르코니아 (YSZ) 는적용한계성을나타내고있다. 특히, 기존 YSZ이적용된열차폐코팅은운용중발생하는복합응력에의한파괴가발생할수있다. 최근이를해결하기위해자가치유열차폐코팅이제시되었으며, 치유물질에대한전처리효과에대한연구가지속적으로진행되고있다. 따라서본연구에서는최근연구가진행중인 MoSi 2 을치유물질로사용하여치유성능의향상 (MoSi 2 의조기반응과기계적응력향상 ) 을위한치유물질의캡슐화공정과코팅재에대한연구를수행하였다. 본연구에서적용된코팅재는삼성분계로서, TEOS, NaOMe 그리고 Al(OEt) 3 를각 1 : 1 : 1, 2 : 1 : 1, 5 : 1 : 1 몰비로혼합한후 MoSi 2 를캡슐화하여기존 YSZ과혼합한물질을출발분말로사용하였다. YSZ과캡슐화된 MoSi 2 를이용하여 10 mm 지름의시험편을제작하였으며, 자가치유성능을확인하기위하여비커스압입법을이용하여인위적인균열을형성한후 1100 o C의온도에서 40분가열 20분냉각하는등온산화시험으로균열진행및치유거동을고찰하였다. 또한제작한시험편에압입시험을통해기계적특성을평가하였으며, 이를통하여 TEOS와 NaOMe, Al(OEt) 3 를 5 : 1 : 1의 mol% 로캡슐화한 MoSi 2 가혼합된출발분말로제작된시험편에서가장우수한균열저항성및높은기계적특성을확인하였다. 이러한결과로치유재적용열차폐코팅의적용성및균열거동에대한저항성을확인할수있었다. P1-S33-2 Structural Properties and Photocatalytic Activity of Low Temperature Electrospun 1D Titanium Dioixide 저온에서전기방사를이용해제작된티타늄옥사이드나노섬유의구조분석및광촉매특성평가송찬근 1,2*, 윤종원 1, 원종한 2. 1 단국대학교, 2 한국기초과학지원연구원 Electrospinning is one of simple methods for generating oxide semiconductor nanofibers by combination with the sol-gel process. However, it is well known most of the experiments using the electrospinning require more than 500 C heat treatment. In this study, TiO 2 nanofibers were fabricated by the sol-gel process and the electrospinning method. These nanofibers made of heat-treated at a relatively low temperature of 280 C. Also these nanofibers were subjected to UV cleaning process. Crystalline phase, surface morphology, micro structure properties and surface chemical states of fabricated nanofibers were characterized by XRD, SEM, TEM, Raman and XPS, respectively. According to XRD results, nanofibers were composed of the anatase and rutile mixed phase at the calcination temperature of 280 C. The average diameter of TiO 2 nanofibers were about 250 nm. Raman spectroscopy and XPS results, it was confirmed that the residual carbon. Therefore, the residual carbon of TiO 2 nanofibers was removed by UV cleaning. The photocatalytic properties were evaluated by degradation of methylene blue under solar light irradiation. The photocatalytic properties of TiO 2 nanofibers were better compared to P25 powders. Especially, in the case of the after UV cleaning TiO 2 nanofiber samples were efficiency of about two times compared to P25 powder. P1-S33-3 Effects of Interface stability, Thermal Durability and Thermal Barrier Performance in Thermal Barrier Coatings with Their Purities 열차폐코팅순도에따른계면안정성및열적내구성과열차폐성능평가박현명 1*, 정성훈 1, 전수혁 1, LYU GUANLIN 1, 정연길 1, 박광용 2, 김인수 2, 양병일 2. 1 창원대학교, 2 두산중공업가스터빈고온부품에서모재의온도수용성확보를위해적용되는열차폐코팅은가스터빈의연료효율향상과대형화추세에따른터빈입구온도의상승으로보다우수한열적내구성및안전성을요구받고있다. 이러한열차폐코팅의열적내구성은미세구조및이를형성하는출발분말과깊은연관성을가진다. 따라서본연구에서는탑코팅의분말종류, 즉분말의순도및상 ( 일반순도, 고순도, 단사정상포함유무 ) 에따른열차폐코팅의열차폐성능과열적내구성을평가하였으며, 이를위해화염열충격시험 (JETS: Jet Engine Thermal Shock) 을진행하였다. 시험조건은 25초간화염 (1400 o C) 에노출되고, 25초간냉각가스질소 (N 2 ) 를이용하여 2000회까지진행하였으며, JETS 시험진행중탑코팅표면과모재표면에광학온도계 (pyrometer) 를이용하여열차폐성능을평가하였다. 출발분말의종류및단사정상의포함유무에상관없이모든시험편은 JETS 시험에서 2000회까지건전한상태를유지하였으나, 고순도분말을적용한경우일반순도분말을적용할경우보다우수한열차폐성능을나타내었다. 한편, 박리까지의 JETS 시험을통해출발분말의순도및상특성이급격한온도변화를갖는환경에서열차폐코팅의열적내구성및안정성에미치는영향을고찰하였다. P1-S33-4 Thermodynamic Medeling and Application of Tantalum Carbide CVD 탄탈륨카바이드의화학기상증착에대한열역학모델링과응용김현미 1,2*, 최균 1, 심광보 2. 1 한국세라믹기술원, 2 한양대학교, 탄탈륨카바이드 (TaC) 는 3000 o C 이상의높은융점을가지며, 우수한내열성, 내삭마성, 내화학성및내열충격저항성과같은특성을가지고있는초고온세라믹소재중하나이다. 이러한특성으로인하여우주항공, 군사무기, 고온고압엔젠분야같은그한환경에서의응용소재로써각광받고있다. 초고온특성을가지는화 한국세라믹학회 149

170 2017 년한국세라믹학회추계연구발표회 학양론비의 TaC 를화학기상증착 (CVD) 법으로얻기위해서는공정변수에대한정교한설정이필요하다. 본연구에서는 TaCl 5 -C 3 H 6 - H 2 시스템에서 CVD 를통한 TaC 증착공정의온도, 압력, 조성 (Ta/ C 비율 ) 을변화시켰을때석출되는상의영역을열역학계산을통해나타내었고, 이계산결과를기반으로실험조건을설정하였다. 증착변수중 Ta/C 비율의조절을위해서 TaCl 5 분말은분체정량공급장치를통해공정시간동안균일하게공급되었다. 공정변수에따른열역학계산결과와실제실험결과를비교하였고, 온도에따른 TaC 의증착특성변화를분석하였다. P1-S33-5 Modeling of Chemical Vapor Infiltration Process for C/SiC Composite Using CFD CFD를이용한 C/SiC 복합체제조를위한화학기상침투법의모델링김경미 1,2*, 최균 1, 이종흔 2. 1 한국세라믹기술원, 2 고려대학교탄소섬유강화탄화규소복합체 (C/SiC) 는기존세라믹스의낮은열적혹은기계적충격저항성을극복하여다양한응용분야에사용될수있다. 특히뛰어난비강도 (specific strength) 와고온안정성, 내마모특성때문에 1400도이상의초고온에서경량구조를필요로하는우주및항공분야에많이사용된다. 이러한복합체를제조하는방법으로는화학기상침투법 (CVI) 이있다. 이는열분해된기상의화학종들을프리폼내부의서로연결된개기공속으로침투시킨후섬유표면에서분해시켜치밀화하는공법으로, 다른공정에비해매우균질한고순도의 SiC 기지상을형성시킬수있다. 하지만, CVI공정후에도프리폼내의큰기공들은남아있게되며, 이러한잔류기공들의분포는프리폼내의가스의거동이나공정온도와압력에따라달라진다. 본연구는프리폼의균일도를높이기위하여공정조건을 CFD 시뮬레이션으로예측하였으며그결과를같은공정으로제조한복합체의미세구조와비교하였다. P1-S33-6 Synthesis of Boron Nitride Coated Carbon Fiber By Structural Substitution Method Using Graphene 그래핀을이용해탄소섬유에구조치환방법으로 Boron nitride 합성김혜영 1*, 김우식 1, 도환수 1, 황진욱 2, 김철진 2. 1 한국세라믹기술원, 2 경상대학교 Carbon fiber (CF) has extraordinary mechanical properties, chemically resistant and lower thermal expensive coefficient. However, CF shows very low mechanical strength at high temperature in oxidation atmosphere. Carbon atoms of CF reacted with oxygen over 300 o C and then which transformed to CO 2 and CO gas. In order to prevent oxidation of CF, we studied the formation of Boron nitride (BN) on the surface of CF using structural substitution of form graphene to BN. Boron nitride has excellent insulating properties, thermal conductivity and mechanical strength at the high temperatures therefore BN could protect the oxidation of CF at the high temperature with oxygen atmosphere. Lattice parameter of hexagonal BN is almost matched with graphene structure (over 99.%). So we could synthesized BN structure on the surface of graphene coated CF by structural substitution method. The structure feature of BN was analyzed FE-SEM, FT-IR, and TGA. P1-S33-7 Preparation and Absorption Characteristics of Silicon Carbide Mat under Microwave KHISHIGBAYARKHOSERDENE *, 주영준, 조광연. 한국세라믹기술원 Flexible silicon carbide fibrous mats were fabricated by combination of electrospinning and polymer-derived ceramics route. During the electrospinning process, various spinning parameters such as solution concentration, electric potential and flow rates were applied in this experiment. The electrospun PCS fibrous mats were cured under halogen vapor atmosphere and heat treated at 1300ºC. Random and networked structure of SiC fiber mats have shown strong microwave absorption properties under 2.4 GHZ of frequency. The microwave absorption was strongly depended as function of its thickness and fabrication parameters. SiC fiber mats can be heated up to 1600 o C within couple of seconds with appropriate amount of thickness due to the microwave absorption. P1-S33-8 Mechanical Properties of Carbon Fiber Reinforced Porous Ceramics by Direct Foaming 직접발포성방법에의해제조된카본섬유가보강된다공체세라믹스의기계적특성장우영 1*, 이기성 2, 이성민 3, 김익진 1. 1 한서대학교, 2 국민대학교, 3 한국세라믹기술원 This paper reports the mechanical properties of carbon-fiber reinforced porous Al 2 O 3 ceramics by a direct foaming. The thermodynamic instability of bubbles in wet foam due to the large and highly energetic interfacial area is the main challenge of processing such foams from colloidal suspension. Smaller bubbles under pressure diffuse into larger bubbles. This is known as Ostwald ripening, and it results in coarsening of the wet foam. Hence, the bubble size distribution broadens. To optimize the wet foam stability and the moderate mechanical strength of porous ceramics, the air content, bubble size, relative bubble size, and fiber content of Al 2 O 3 particle hydrophobized and stabilized colloidal suspensions are investigated. Hertzian indentations are used to evaluate the damage behaviour under constrained loading conditions. The mechanical behaviour from indentation load-displacement curves is compared according to carbon-fiber contents in the samples P1-S33-9 Manufacturing and Properties of Epoxy/Basalt Fiber Composite Applied to Various Type of Flame Retardants 난연제를종류별로적용한현무암섬유 / 에폭시복합체제조및특성평가이수연 *, 임형미, 이두진, 문소윤. 한국세라믹기술원 FRP (Fiber Reinforced Plastic) 는재료의가공성, 경량성, 경제성등과함께섬유를첨가함에따른고강도, 내마모성등의장점을가지기때문에기계, 항공, 해양등의많은분야에서활용되고있다. 에폭시수지가 FRP에가장대표적으로사용되는 matrix인데, 에폭시수지는가공이용이하며전기절연성및화학적, 기계적특성이우수하여다방면에서응용되나, 난연성이취약하여난연특성을요구하는분야에는응용이제한적이라는단점이있다. 본연구에서는 FRP의난연특성을향상시키기위하여난연제종류별로복합체를제조하고그특성을평가하였다. CaSO 4 2H 2 O, Ca(OH) 2, CaCO 3 를사용하여 Ca 계난연제별로특성을비교하였고, Al(OH) 3, Mg(OH) 2 와함께 MgCO 3 를사용해수산화물난연제별및탄산이들어간난연제별로섬유복합체를제조하여특성을평가하였다. TGA 및 SEM 분석을통해입자의특성을파악하였고, 제조한복 150 한국세라믹학회

171 포스터발표 I 합체의난연성과기계적특성을측정하기위하여 LOI 및콘칼로리미터와인장강도를측정하여그특성을비교하였다. P1-S33-10 The Characteristics of Modified Polycarbosilane (PCS) with Different Organic Solvents 다른유기용매로개질된폴리카보실란의특성주영준 1*, KHISHIGBAYARKHOSERDENE 1, 김철진 2, 조광연 1. 1 한국세라믹기술원, 2 경상대학교 Silicon carbide (SiC) fibers, which have a high tensile strength, thermal resistance, and chemical resistance, are emerging as a material for application to ceramic matrix composites (CMCs). However, SiC fiber converted from polymer precursor suffer from various problem in the production process. Especially, Polycarbosilane (PCS) as a polymer precursor commonly has a poor spinnability during melt spinning because it breaks easily by low molecular weight (M n : ). In this study, the structure of precursor was modified by polymer blend method to improve the spinnability of melt spinning and continuity of PCS green fiber. The melting point and ceramic yield of PCSs polymer-blended with the solvent, having a different boiling point and equilibrium vapor pressure, changed through the reaction between PCS and solvent. The GPC profiles of blended PCS with para-, ortho-, and meta-xylene solvents show the increase of high molecular weight by the cross-linking of polymer structure. Since the ratio of Si-H/Si-CH 3 is similar and formation of new peak was not detected in IR spectrum, the reaction between PCS and solvent is considered as a physical bond. The apparent activation energy of PCSs was also calculated by Andrade equation to confirm the sensitivity for the temperature. Finally, PCS green fibers, that were spun with modified PCS, were converted to SiC fibers by pyrolysis at 1300 C. And then, the surface and mechanical strength of SiC fiber were analyzed by SEM and tensile strength analyzer. P1-S42-1 The Newly Synthesis Method of Amorphous N-doped TiO 2 Nanoparticles by Plasma-assisted Electrolysis and its Photocatalytic Property in Visible Region 플라즈마전기분해법을이용한새로운비정질 N-doped 산화티타늄나노입자제조방법및가시광영역에서의광촉매특성평가김태형 *, 이찬기, 박경수. IAE고등기술연구원산화티타늄은물리적또는화학적으로특별한성질을가지고있어여러분야에서사용하기위해많은연구가진행되어왔으며, 광촉매, 투명전극, 태양전지와같은응용분야에서사용되고있다. 그중 N-doped 산화티타늄은좁은 band gap으로인해가시광영역에서광촉매특성을보이며강력한유기물분해물질로집중적으로연구되어왔다. 산화티타늄은보통졸겔법, 수열합성법또는침전법에의해제조되고있는데이방법들은용액의 ph나온도와같은변수를정확히조절해야하고반응시간이길며반응후에도반응한유기물을제거하기위해세척과건조과정을필요로한다. 이러한단점들을보안하기위해플라즈마전기분해법을이용하여나노입자를제조하였다. 일반적으로이방법은소량의전해질과짧은반응시간을이용하여부식되기쉬운금속표면에두껍고내구성이좋은산화층을형성시켜부식으로부터보호하기위한층을만드는방법이었다. 실험변수들을조절하여비정질산화티타늄을제조할수있었다. 또한전해질농도를조절하여입자사이즈를 16 nm에서 28 nm 까지조절할수있었다. 제조된입자를이용해입자구조에따른광 촉매특성을평가하기위해비정질산화티타늄을각각다른열처리온도를통해 anatase, rutile 그리고두상이섞인형태로제조하였다. 광촉매특성은메틸오렌지용액에입자를투입후 300 W xenon lamp 를조사하여측정하였으며측정결과두상이섞인상태의입자가가장높은효율을보였으며이는서로다른 band gap 사이의상호작용으로인한결과라고볼수있다. 이새로운방법을이용한산화티타늄제조방법을통해산업분야에높은질과대량생산의장점을가짐으로써많은공헌을할수있을거라고생각된다. P1-S42-2 The New Synthesis Method of Indium Tin Oxide Nanocubes and its Simple Control of Sn Content by Plasma Electrolyic Oxidation 플라즈마전해산화방법을이용한새로운산화인듐주석나노큐브제조및 Sn 도핑량조절에관한연구김태형 *, 박경수, 이찬기. IAE고등기술연구원다양한재료들이가시광영역대에서의높은투과도와전기전도도를가지는투명전극을만들기위해연구되어왔다. 많은연구들이보여주듯이, 가장높은잠재력을가진물질은 n-type이고 3.5 ev의넓은밴드갭을가지는 indium tin oxide (ITO) 이다. 높은투명도와낮은저항을가지고있음에따라, film-base의장치들인 panel display, reflective film, photovoltaic cell 그리고가스센서등에이용되어왔다. ITO nanoparticle을제조하기위해 hydrothermal, solgel 그리고 precipitation 등의방법들이이용되고있지만, 이방법들은용액의온도, ph 등에민감하게반응하고제조하는데많은시간이걸린다. 이러한단점들을보안하기위해, plasma electrolyte oxidation (PEO) 방법을이용하여 IT alloy에서나노입자를합성하였다. PEO는부식하기쉬운금속표면에균일한산화막을형성시켜내구성을높이는방법으로마그네슘, 알루미늄및아연등에사용되고있는기술이다. 용액의조건을변화시킴으로써, 산화막이아닌산화금속을제조할수있었다. 제조된 ITO의구조는전해질의농도, power supply의 frequency 에많은영향을나타내는것으로나타났다. 입자의크기는 95 ~ 130 nm 사이로조절할수있었으며, 제조된입자는 Cubic 형태의 indium hydroxide로나타났다 (JCPDS card no ). 이러한방법으로제조된나노입자는 500 o C 2 h 열처리를통해 ITO로변형시킬수있었으며, XRD를통해관찰할수있었다 (JCPDS card no ). P1-S42-3 The Synthesis Method of Indium Oxide Nanocubes by Plasma-assisted Electrolysis 플라즈마전기분해방법을이용한산화인듐나노입자제조에관한연구김태형 *, 박경수, 이찬기. IAE고등기술연구원 Indium oxide 나노입자는 cubic 구조를가지고있으며 transparent conducting oxide, hot mirror 그리고 optical coating에사용되고있다. 그동안 indium oxide는 hydrothermal, sol-gel, precipitation 등을이용한방법으로많이제조되어왔다. 하지만이방법들은전구체를사용하여제조함에따라 ph, 용액의온도와같은변수에매우민감하며오래시간이걸린다. 따라서이러한단점들을해결하기위해 plasma-assisted electrolysis 방법이도입되었다. 이방법은금속표면에산화층을형성시켜두껍고높은내구성으로인해부식을막을수있도록하는기술이었다. 여기에이용되는용액의조성을변화시켜코팅이아닌금속막대로부터나노입자를성장시킬수있는방법을도입하였다. 한국세라믹학회 151

172 2017 년한국세라믹학회추계연구발표회 Indium bulk 를 KOH 10 mmol 용액에담그고양극에연결한다음, 음극에는안전한금속인 Stainless steel 을연결한다. 음극의역할은양극에연결된금속에균일한전압을걸어주기위한장치이다. 반응온도는 20 o C 로유지하였으며, 반응시간은 10 min 으로유지하였다. 합성된입자의구조는 cubic structure 였으며, 전해질의양이증가함에따라수득되는입자의양또한증가하였다. 그러나전해질의농도가증가함에따라 plasma 의세기가증가하여원래가지고있던구조를잃고 agglomeration 이형성되었다. 전해질의농도변화없이반응시간을증가시켰을때구조의변화는없었고수득되는입자의양이증가하였다. XRD 분석을통해 indium oxide 와 indium hydroxide 의혼상임을확인하였고, 열처리를통해 indium oxide nanocube 를얻을수있었다. P1-S42-4 The Graphene Quality Depending on Copper Catalyst in Chemical Vapor Deposition Method 화학기상증착방법에서구리촉매에의한그래핀품질최동수 1*, 이영훈 2, 유정현 2, 윤대호 2. 1 동아대학교, 2 성균관대학교 Graphene is excellent alternative material replacing ITO due to its superior electrical and optical properties as well as flexibility. However, it is necessary to improve the graphene quality or to stack graphene because monolayer graphene has a poor sheet resistance. Stacking graphene process is terribly inconvenient, since the controlling graphene is so tough due to its very thin thickness. Therefore, we need to improve the quality of graphene in chemical vapor deposition method. CVD is a commonly used method for large area graphene fabrication. The study for metal substrate as a catalyst has attracted tremendous attention for the last few years. Copper has been used as growth catalyst due to its low carbon solubility in the synthesis of monolayer CVD-graphene. The solubility is closely related with the self-limiting precipitation growth and surface decomposition of carbon-containing molecules. Herein, graphene film was synthesized on the different fabricated type copper foils having similar thickness by thermal CVD method. As-grown graphene on copper catalyst was characterized. The X-ray diffraction peak shows the crystalline graphene on electrolyte or rolled copper catalysts. Graphene was transferred to target substrates using wet transfer process. Graphene was analyzed by Raman spectroscopy, scanning electron microscopy (SEM) to figure out their characteristics and to find the optimum catalyst condition. P1-S42-5 Residue Free Transfer of Graphene Using Cyclododecane 싸이클로도데케인을이용한그래핀의전사방법김민정 1*, Andrea Gnisci 2, Giuliana Faggio 2, Nicola Lisi 3, Andrea Capasso 4, 이관형 1. 1 연세대학교, 2 University Mediterranea of Reggio Calabria, 3 ENEA, 4 Istituto Italiano di Tecnologia Graphene, two-dimensional (2D) hexagonal lattice structure, has superior properties, such as high mechanical strength, flexibility, transparency, and conductivity. Due to these properties, graphene has attracted a great interest from researchers and has been considered as a promising candidate for flexible electronic devices. Among the synthesis techniques of graphene, chemical vapor deposition (CVD) is one of the most promising techniques for large-scale production. Because metal substrates, such as Ni, Cu, and Pt, are used as a growth template, graphene film grown by CVD should be transferred onto another substrate for fabrication of electronic devices. Generally, a polymer thin film is used to support graphene layer during etching process of metal substrate. However, it is impossible to perfectly eliminate all the polymer film despite of repetitive rinsing and annealing at high temperature. Because this residual polymer lowers electrical properties of graphene, new transfer technique has been required for commercialization of CVD-grown graphene. Here we report a residue-free transfer method by using sublimatable polymer, cyclododecane. The cyclododecane film supports CVD graphene during transfer process, then it is vaporized slowly at room temperature, remaining no residue. Therefore, no additional removal process of polymer is required. Our result shows a promising transfer technique for large-scale production of graphene devices, which can be also used for other nanomaterials. P1-S42-6 Structure-controlled Sb 2 Se 3 Nanowires/Thin Films Fabricated via Modification of Annealing Process and their Photoelectrochemical Characteristics 열처리조건조절을통한 Sb 2 Se 3 나노와이어및박막구조제어와광전기화학적특성김영빈 *, 백승기, 김주성, 윤영대, 조형균. 성균관대학교 Sb 2 Se 3 is an emerging material as a photovoltaic absorber due to its high absorption coefficient (> 10 5 cm -1 ) and suitable band gap (1.33 ev). Unlike other chalcogenide materials such as Cu 2 (Zn,Sn)S 4 and Cu(In,Ga)Se 2, Sb 2 Se 3 has no the secondary phase and has a low melting point, which can make it possible to synthesize Sb 2 Se 3 with uniform composition. Interestingly, Sb 2 Se 3 crystals have a layered structure that covalent bonded ribbons are stacked with van der Waals bonds. Due to layered structure, crystal growth direction controlled Sb 2 Se 3 has no dangling bond at the surfaces which show low surface potential differences (< 10 mv) at grain boundaries, minimizing the defect location. In our study, we synthesized Sb 2 Se 3 nanowires and thin films which have preferred crystal growth orientation, by utilizing layeredstructure of Sb 2 Se 3, for photoelectrochemical (PEC) applications, such as water splitting and purification. This Sb 2 Se 3 nanowires show p-type conductivity and high photoelectrochemical stability during water splitting in strong acidic or basic solutions due to low surface potential and the lack of defects. But, Sb 2 Se 3 thin films have intrinsic conductivity, so it can show both p-type and n-type characteristics in PEC characterization. P1-S42-7 Polycrystalline SnO 2 -CuO Hollow Nanofiber Networks for High-performance H 2 S Gas Sensor H 2 S 가스센서의높은특성을갖는다결정 SnO 2 -CuO 나노튜브네트워크센서박기륭 *, 송요셉, 조홍백, 좌용호. 한양대학교 Polycrystalline SnO 2 -CuO composite hollow nanofibers are synthesized and envisaged for a high-performance H 2 S gas sensor. Resistive sensors composed of SnO 2 and CuO are known to be highly efficient in detection of detrimental H 2 S gas in terms of sensitivity, selectivity and detection time. The SnO 2 -CuO nanotubes were synthesized via facile process of electrospinning with a mixed solutions of Sn and Cu precursors followed by heating process owing to Kirkendall effect 152 한국세라믹학회

173 포스터발표 I drawing on the different diffusion rate between SnO 2 /CuO and Sn/Cu. The CuO nanoparticles were homogeneously distributed within SnO 2 tubular shape having 15 nm wall thickness. High enhancement of the sensitivity (R a /R g ) of 170 and very fast response time of 10 s with a stable recovery time to a low concentration of H 2 S to 1 ppm at 150 o C were exhibited as a promising candidate for gas sensor system due to increased surface area with metal oxide catalyst. P1-S42-8 New Doped Graphene Electrode for Lowering Contact Resistance of MoS 2 이산화황몰리브데늄의컨택저항을낮추기위한새로운도핑그라핀전극서동제 1*, 김영덕 2, 이재준 1, 나주관 1, Takashi Taniguchi 3, James Hone 4. 1 연세대학교, 2 경희대학교, 3 National insitute for Materials Science, 4 Columbia University Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have been attracting a wide range of research attention. The presence of unsaturated d-orbitals, in which the transition metal contributes to the band structure of the material, makes TMDCs a focus of research by interesting properties such as charge density waves, magnetism, and superconductivity. However, there are still challenges such as low-resistance and air-stable and thermally stable ohmic contacts with an order of magnitude lower contact-resistance. To date, various methods such as the use of graphene contact and phase engineering, do not provide true ohmic contact. Here, we demonstrate low resistance ohmic contact to molybdenum disulfide (MoS 2 ) using highly n-type graphene, nitrogen doped graphene. FETs fabricated on hbn encapsulated MoS 2 had n-type behavior with an on/off ratio of about ~10 5 and a field-effect mobility of 65 cm 2 /Vs at room temperature. In addition, the conductance of MoS 2 devices with a shift in the threshold voltage from positive to negative signifying a transition from the more n-type behavior of nitrogen doped graphene to enhancement mode by doping effect at low temperature. Therefore, using doped graphene represent a new device paradigm that overcomes a significant bottleneck in the performance of TMDs and a wide variety of other 2D materials. P1-S42-9 Three-dimensional Graphene and Silicide Nanowire Hybrids as a Li-ion Battery Anode 그래핀 - 니켈실리사이드나노와이어 3차원리튬이온배터리음극소재장원준 *, 박원일. 한양대학교 Although the lots of research have improved the performance of lithium-ion batteries, their cycle stability and energy density at high rate condition remain insufficient. Recently, Silicon-based material, having much higher theoretical capacity than conventional graphite anode, has emerged as one of the most promising new anode material to follow those requests. However, the general problems of silicon active materials, large volume expansion and unstable formation of solid-electrolyte interface layer, have hindered the real application in industry field. In this work, 3D mesoporous graphene encapsulated silicide nanowire electrode has been synthesized using two-step chemical vapor-deposition process. The 3D Graphene give not only conductivity to electrode but also prevent direct contact between active material (silicide nanowire) and electrolyte. Thank to this, silicide nanowires can maintain high capacity during 1000 cycles and exhibit high rate capability. P1-S42-10 Fabrication of High-k Dielectric Thin Films using 2D Perovskite Nanosheets 2차원페로브스카이트나노시트를이용한고유전율박막의제작임해나 1*, 류소연 1,2, 성영은 3, 최지원 1. 1 한국과학기술연구원, 2 고려대학교, 3 서울대학교 Researching on two-dimensional (2D) materials have been strongly boosting for next-generation devices because of its high mobility and optical properties. Above all, Dion-Jacobson perovskites nanosheet have been attracting attention as a dielectric thin film because it shows high-k dielectric permittivity undisturbed for thickness and low dielectric loss at the same time. However, the dielectric permittivity of thin films is still inadequate compare with thick film value, so development of new composite nanosheets to enhance dielectric performance is necessary. Here, we synthesized a new perovskite Sr 2(1-x) Bi 2x Nb 3 O 10 nanosheets by the exfoliation from KSr 2(1-x) Bi 2x Nb 3 O 10 perovskite oxide. Then, we successfully fabricate a high-k thin film by Langmuir-Blodgett deposition. The nanosheets thin film shows the great dielectric permittivity above 550. Therefore, these results show that the newly synthesized dielectric nanosheets have enhanced dielectric properties and may be used in new 2D electronic devices. P1-G5-1 Effect of Solid Loading of Zirconia Slurry on the Granule Formation by Two-fluid Spray Drying 지르코니아슬러리내고체함량이분무건조시과립형성에미치는영향정형도 *, 이종국. 조선대학교 3Y-TZP 지르코니아분말을이용하여여러조성의슬러리를제조한다음분무건조에의하여둥근형태의과립을제조하였으며, 지르코니아슬러리내분말함량과첨가제사용이과립형성에미치는영향을고찰하였다. 3Y-TZP 지르코니아슬러리내고체함량은분무건조가가능한 40~60 wt% 로제어하였으며, 용매로는이소프로필알콜을사용하였다. 또한슬러리안정성과과립형성을촉진시키기위하여분산제와결합제를각각사용하였다. 분산제로는 Triton X-100을, 가소제로는 PEG 20,000을, 그리고결합제로는 PVB 를각각사용하였다. 또한슬러리의점도를낮추기위하여암모니아수를이용, ph를 11.5로조절하였으며, 볼밀을행하여분산성및균질성을개선하였다. Two-fluid 타입의분무건조기를사용하여 195 C에서분무건조를행하여둥근과립을제조하였으며, 포집된과립분말의형상과미세구조를공정조건과연계하여고찰하였다. 또한제조된과립분말을이용하여성형및소결물성을관찰한후, 슬러리내고체함량등슬러리제조조건및분무건조공정조건이과립분말특성에미치는영향을분석하였다. 슬러리내분말의함량이증가할수록, 과립의크기가증가하였으며, 구형도가큰과립분말이형성되었다. 이러한과립분말의미세구조를관찰한결과, 입자간에보다균질하고치밀한구조를나타내었으며, 이로인하여성형밀도및소결밀도가증가하였다. 전반적으로분무건조에의한지르코니아과립제조시과립의형상과미세구조는슬러리조성과점도, 분말의입도분포, 분무건조공정조건들에의하여크게변화하였다. 한국세라믹학회 153

174 2017 년한국세라믹학회추계연구발표회 P1-G5-2 Sintered Characteristics of Zirconia Ceramics with Solid Loading on Slip Casting 주입성형시슬립내고체함량에따른지르코니아소결특성김대성 *, 이종국. 조선대학교현재사용되는대부분의치과용지르코니아임플란트는지르코니아블록을정밀선반으로가공하여주로성형하는데, 이러한선반가공은지르코니아성형체표면에많은균열을유발하게된다. 발생된균열은소결시치밀화를통해부분적으로제거될수있지만, 남아있는일부균열로인해임플란트의기계적물성및신뢰성이크게저하된다. 본연구에서는성형체의표면가공이필요없는주입성형을통하여지르코니아성형체를제작한후소결하여표면결함을최소화한고밀도의지르코니아시편을제작하고자하였다. 주입성형에사용된슬러리는 3Y-TZP 지르코니아분말과증류수, 그리고점도조절용분산제 (Darvan C) 를혼합하여제조하였다. 이과정에서암모니아수를이용, 슬립의점도를가장낮게유지하도록 ph를 11로제어한후, 고체첨가량에따른슬러리의점도변화를분석하였다. 고체첨가량이 50 wt% 일때슬러리점도는 36.4cP 로가장낮게나타났으며, 고체첨가량을 65 wt% 로증가시키는경우슬러리점도는 730cP로급격하게증가하였다. 고체첨가량이변화된각각의슬러리를이용하여주입성형체를제조한후, 900 o C 에서 1차열처리후, 1500 o C에서 2시간소결하여얻은소결시편의물성을관찰하였다. 그결과모든시편에서소결밀도가 6.01 g/cm 3 이상인치밀체가얻어졌으며, 그중에서도고체첨가량이 50 wt% 일때가장높은밀도 6.03 g/cm 3 를나타내었다. P1-G5-3 Enhancement of Surface Roughness on Zirconia Substrate by Room Temperature Spray Coating 상온분사코팅에의한지르코니아기판의표면조도향상김형진 *, 이종국. 조선대학교지르코니아는우수한기계적물성및생체적합성을가지고있으며, 광학적으로도심미성이뛰어나치과용임플란트재료로사용되고있다. 그러나생체불활성소재이기때문에체내에골조직과의결합력이떨어지고이로인하여생체조직과의직접적결합이형성되지않는단점이있다. 본연구에서는지르코니아분말의상온분사코팅을통하여지르코니아기판의표면거칠기를높이고, 이를통하여골결합성능이우수한지르코니아시편을제작하고자하였다. 상온분사코팅시표면거칠기를높이기위하여코팅분말의입자크기, 기판의왕복횟수, 노즐과의거리등을조절하면서코팅층을형성하였다. 예비실험을통하여얻은공정조건으로부터기판과분사노즐과의거리를 5~50 mm까지변화시켰으며, 기판의왕복횟수는 25~100회로조절하였다. 공정조건에따른코팅층의형태와미세구조를전자현미경으로관찰한결과, 표면거칠기는기판과노즐사이거리에따라변하였으며, 코팅횟수가증가할수록코팅층두께와표면거칠기가점차증가하였다. P1-G5-4 Removal of Pollutants from Wastewater by Iron Oxide/ Mesoporous Carbon Nanocomposites as Fenton Catalysts 산화철 / 메조다공성탄소나노복합체를펜톤반응촉매로이용한수중오염물질제거천진녕 1*, 이진우 2. 1 한국세라믹기술원, 2 포항공과대학교본연구에서는산화철 (Fe 3 O 4 ) 나노입자가메조다공성탄소의기공내에담지된형태의나노복합체를합성하고, 이를펜톤 (Fenton) 반응의촉매로활용하여수중에존재하는유기물질및중금속이온제거에우수한효과를나타냄을확인하였다. 평균 30 nm 크기의메조기공을갖는메조다공성탄소 (MSU-F-C) 에습식함침법을이 용하여철전구체를담지한후열처리하는과정을통해, 약 20 nm 크기산화철나노입자가메조다공성탄소의기공내에담지된형태의나노복합체를합성하였으며, 합성된소재는높은포화자화도와함께매우작은잔류자기를나타내었다. 합성된산화철 / 메조다공성탄소나노복합체를페놀 (phenol) 및비소 (arsenic) 이온제거를위한펜톤반응의촉매로활용한결과, 상용산화철소재대비우수한활성을나타내었으며, 자성을이용한물질회수및분산을통한재사용이용이함또한확인하였다. P1-G5-5 Peptide Directed Synthesis of Continuous DNA Nanowires for Analysis of Large DNA Molecules DNA의 SEM 분석을위한나노입자와 peptide 기반의 DNA metallization 및이를통한 nanowire 의합성김경일 1*, 이성현 2, Xuelin Jin 2, 김수지 1, 조규봉 2, 이정헌 1. 1 성균관대학교, 2 서강대학교 Being an important genetic molecule with programmable functionality, DNA is actively studied in diverse areas in cutting-edge science and technology. Although numerous studies have reported the visualization of DNA molecules, most studies were carried out with transmission electron microscopes, atomic force microscopes, or fluorescence microscopes, which are actually not desirable for whole analysis of micro/millimeter sized DNA molecules with nanometer sized features. Although scanning electron microscope (SEM) has great potential for DNA analysis with nanometer scale resolution and millimeter scale permissible range, it has been rarely used for analyze of whole DNA molecules. In this work, we developed a novel approach to synthesize smooth and continuous DNA nanowires applicable for analysis of large DNA molecules by SEM. By introducing thiol-tagged DNA binding peptides, we could densely introduce thiol groups into native DNA molecules. This allowed us to immobilize DNA molecules on conductive gold substrates and densely anchor gold nanoparticles onto DNA backbone. Subsequently, we could use these gold nanoparticles as seeds to guide smooth and continuous DNA templated metallization. Using our method, we not only could image smooth and uniform structures of λ-dna (48.5 kb), its dimer (97 kb), and trimer (145.5 kb), but also observe entangled three-dimensional images of DNA using SEM, which are very difficult to be achieved with other analytical techniques. P1-G5-6 Engineering Hierarchical Porosity of Synthetic Graft Materials For Highly Enhanced Bone Regeneration 향상된골재생을위한나노 / 마이크로 / 마크로의기공을모두갖는계층적다공성합성골이식재에대한연구이규성 *, 김대환, 이정헌. 성균관대학교 Synthetic graft materials can be an ideal alternative of allografts and xenografts because they have less concerns of unwanted immune reactions or disease infections after surgery. However, as the mechanical and structural properties of synthetic graft materials are very different from those of natural bones, their performance is generally not comparable to other graft materials. In this work, we introduce a novel method to synthesize a graft material mimicking natural bone structures by controlling their hierarchical porosities. We used hydroxyapatite nanoparticles and 154 한국세라믹학회

175 포스터발표 I used a bottom-up based approach to introduce both nanoscale and micro/macroscale pores into synthetic graft materials. The graft materials with hierarchical porosity not only had good biocompatibility and osteoconductivity but also turned out to significantly improve bone regeneration. P1-G5-7 A Study on the Applicability of Pretreatment for Commercialized Continuous Milling Equipment to Improve Biofuel Production of Lignocellulosic Biomass 목질계바이오매스의바이오연료생산향상을위한상용화된연속식밀링장치의전처리적용가능성연구구양모 *, 이진형. 한국세라믹기술원목질계바이오연료생산을위해서는복잡한구조를가진바이오매스의효소접근성을향상시키기위한전처리공정이필수적이다. 현재까지개발된전처리방법은화학적전처리방법과물리적전처리방법이있으며현재까지는화학적전처리방법이가장많이활용되는방법이다. 하지만화학적전처리방법은화학촉매를사용하여전처리후발효저해제를발생시키는문제점이있는반면물리적전처리는발효저해제를발생시키지는않지만에너지소비가많다는문제점이있다. 무엇보다도산업적으로활용하기위해서는연속공정을통해대용량처리가가능해야하지만아직까지이에대한연구는진행된적이없다. 본연구에서는기존에상용화장비로유효한연속식밀링장치세가지를선정하여목질계바이오매스의전처리공정의활용가능성을확인하였다. Continuous ball mill (CBM), Air classify mill (ACM), High speed mill (HSM) 세가지를활용하였으며바이오매스는옥수수대를사용하였다. 전처리후바이오매스의분쇄효율을평가하고, 당화효율향상을측정하였다. 최종적으로본공정의에너지소비량을비교하여적용가능성을평가하였다. P1-G5-8 The Direct Production of Jet Fuel from Vegetable Oil over Zeolite 제올라이트를이용한식물성오일로부터바이오항공유직접생산최일호 1,2*, 황경란 2. 1 한국과학기술연구원, 2 고려대학교, 3 한국에너지기술연구원바이오항공유를얻기위하여, 기존의탈산소공정과수첨업그레이딩및증류과정을거치지않고, 원료에서부터항공유를바로생산할수있는방법으로써 8족금속 (Pt, Ni) 이담지된제올라이트촉매를이용하여식물성오일로부터항공유분을생산해보았다. 식물성오일로써대두유가사용되었고, 항공유직접생산에적합한촉매조성을얻기위해 Si/Al 비 (5.1, 30, 80) 가다른여러 HY- 제올라이트가검토되었고, 최적반응조건을도출하기위한반응압력, 온도등을변화시킨실험이연속식고정층촉매반응기에서수행되었다. 또한, Mg나 Zr 등이조촉매로써항공유생산에주는영향도검토되었다. 반응으로부터발생되는가스와액상생성물은가스크로마토그래피 / 질량분석, 산가분석, Simulated Distillate (SIMDIS) 를통해생성가스의조성과액상생성물내카본넘버별분포및조성, 항공유분으로적합한생성물의분율등을확인하였다. 반응결과 (350 o C, 40bar 수소 ), Si/Al 비가낮을수록액상생성물내에지방산이높게나타났고 (Si/Al 비 5.1에서 36.9% 의지방산검출 ), Si/Al 비가높을수록탄소범위 8에서 17사이의이성화된탄화수소분율이증가하였다 (Si/Al 비 80에서 40.5% 의이성화선택도 ). 활성금속으로써 Pt는 Ni에비해더높은이성화선택도 (47.1%) 와액상생성물내 63% 수준의항공유분을보여주었으나, 액상수율이 Pt촉매가 Ni촉매에비해20% 가량낮은 64.6% 를보여주었다. P1-G5-9 Change of Product Phase in the Bone Cement Prepared From Granulated Reactants 과립을이용해제작한인산칼슘계본시멘트의생성물질변화오경식 *, 조현호. 안동대학교 Brushite계시멘트는경조직재건을위해사용되며반응물로 dicalcium phosphate dihydrate (CaHPO 4 2H 2 O : DCPD) 를생성하도록고안되었다. 그런데반응결과 dicalcium phosphate (CaHPO 4 : DCP) 생성하는경우가있으며특히오랜기간습도가높은조건에서보관한경우두드러진다. 이는보관중수분에의해경화반응의구동력이손실된결과로알려져있다. 한편시멘트의출발물질을과립화하면경화액의양이감소하여밀도와강도를개선할수있다. 하지만과립화된원료는반응의구동력을낮다는점에서장기보관한시멘트와유사하므로 DCP의생성여부를점검할필요가있다. 본연구에서는삼인산칼슘과립의열처리온도와경화액첨가량을변수로 DCP생성을관찰한결과처리온도와경화액첨가량이높을수록 DCP의생성이활발해짐을확인하였다. 이는모두경화반응중과포화도를낮추는공통점이있어 Brushite 계시멘트에서 DCP의생성원인을과포화도의변화로설명하였다. P1-G5-10 Effective Power Generation in Microbial Fuel Cells Controlled by Ca 2+ Ion 이수연 1*, 김소영 2, 정택동 2, 이진형 3. 1 한국에너지기술연구원, 2 서울대학교, 3 한국세라믹기술원 In many exoelectrogenic bacteria, biofilm formation occurs in sequential process of transport, attachment, formation of colonies, and maturation using their appendages like pilus. Type IV pili (T4P) are involved in electron transfer to biotic and abiotic surfaces as well as biofilm formation. Recent studies have revealed Ca 2+ -binding in the T4P assembly proteins such as PilY and PilC are essential for pilus production. Moreover, Ca 2+ ions may impact extracellular electron transfer due to the association of Ca 2+ near cytochromes found in the recent crystal structure of decaheme cytochrome, MtrF. Herein, we have modified electrode surface with Calix[4]arenetriacid-monoquinone (CTAQ) to enhance electrochemical communication between exoelectrogenic bacterium Pseudomonas areuginosa PA1 and anode surface. The ionophoric quinone derivative CTAQ has been shown to transfer electrons by coupling with redox-inactive metal ion Ca 2+ in the vicinity of redox centers. In aqueous environments, proton coupled electron transfer reaction of CTAQ can be modulated by presence or absence of Ca 2+ ions in the redox centers. An examination of the influence of Ca 2+ ions on biofilm formation and electron transfer to the CTAQ-modified anode indicates that the transition between the inactive and active states was used to control the electrode activity by external factor as logic switches in the system. Finally, the Ca 2+ -recognized electrode could modulate biofilm formation and electron transfer in the MFC. P1-G5-11 Localized Injectable Drugs Delivery Hydroxyapatite Microspheres for Osteoporosis Therapy 이진형 *, 고일환. 한국세라믹기술원 This study describes the preparation of hydroxyapatite microspheres for local drugs delivery. The formation of the hydroxyapatite microspheres were initiated by enzymatic decomposition of urea and accomplished by emulsification process (water-in-oil). The microspheres obtained were sintered at 500 o C. Scanning electron micro- 한국세라믹학회 155

176 2017 년한국세라믹학회추계연구발표회 scope (SEM) indicated that the microspheres have various porous with random size, which maximizes the surface area. Cytotoxicity was not observed after sintering. Osteoporosis drugs, alendronate and BMP-2, were loaded into HAp microspheres and the releases of both molecules showed sustained releasing profiles. Finally, animal trial was performed to justify all the involved concerns to develop in vivo drug carrier. P1-G5-12 Stable and Continuous Long-term Enzymatic Reaction Using an Enzyme-nanofiber Composite 이진형 *. 한국세라믹기술원 This study shows the preparation and application of enzymenanofiber composites for long-term stable operation. The enzymenanofiber composite was prepared by coating an enzyme-aggregate, the esterase from Rhizopus oryzae, on the surface of the nanofibers. The enzyme-nanofiber composite was repeatedly used in 30 cycles of substrate hydrolysis and still remained active. It was found that enzyme-nanofiber can be used in both repeated-batch and continuous modes for long-term stable operation. P1-G5-13 Environmentally Friendly Pretreatment of Plant Biomass by Planetary and Attrition Milling 구양모 1*, 권정회 2, 이진형 1. 1 한국세라믹기술원, 2 에코바이오홀딩스 ( 주 ) This study evaluated the use of planetary and attrition milling as pretreatment processes for lignocellulosic straw was treated. Since the samples could be milled and enzymatically treated using the same media, loss of the biomass due to washing was effectively eliminated. In contrast, conventional sodium hydroxide and soaking in aqueous ammonia (SAA) processes showed a loss of 34.2% and 14.8%, respectively. Furthermore, milling produced significantly lower concentrations of soluble phenolics than the alkali treatments. Using a bioluminescent bioreporter strain that is sensitive to these phenolics, neither of the milled samples elicited a response while the sodium hydroxide and SAA samples led to a 25.8 and 4.7 -fold induction, respectively. Although planetary milling produced more reducing sugars than attrition milling before saccharification, both had similar monosaccharide yields, i.e., 0.38 and 0.34 g/g-biomass, respectively, when 40 g/l rice straw was treated. P1-G5-14 Improvement of the Injectability in the Brushite Bone Cement with the Sequence of Mixing among the Reactants Brushite Bone Cement에서출발물질의혼합순서변화에따른주사성개선오경식 *, 강철진, 강동훈, 구영진, 박홍렬, 차민경. 안동대학교인산칼슘계시멘트는 Vertebroplasty를이용한척추질환의치료에핵심적소재이다. 이를위해서는우수한주사특성이필요한데, 주사특성의개선을위하여원료분말과경화액관련으로다양한시도가있었다. 인산칼슘계시멘트중에서 Brushite계시멘트는 β- tricalcium phosphate (β-tcp) 와 monocalcium phosphate monohydrate (MCPM) 가핵심구성성분이며 calcium sulfate hemihydrate (CSH) 도흔히첨가된다. 본연구에서는이들분말성분을경화액과혼합할때 MCPM과 CSH를먼저경화액과혼합후주사하는경우에주사성의변화를관찰하였다. 본연구에서는주사율을탑재된양대비배출된양으로정의하고배출된페이스트의경화후상을분석하는방법으로주사체의상태를점검하였다. 6:2:2의질량비로 β-tcp, MCPM, CSH분말을혼합후 0.6 ml/g의경화액을도입하는경우에는 82% 의주사율을나타내었으나 MCPM과 CSH 를먼저같은경화액과혼합후 β-tcp를나중에혼합해주사한경우에는 98% 의주사율을나타내어명확한개선효과가나타났다. 이러한주사특성에대해경화액혼합량의영향을확인하였으며주사된경화체의밀도를분석하여혼합순서의영향을검증하였다. 156 한국세라믹학회

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179 포스터발표 II P2-G1-1 Crystallographically Textured PZT Thin Films by Solgel Process and their Energy Storage Characteristics 임경원 1,2*, 황건태 1, 최종진 1, Ventateswaru Annapureddy 1, Peddigari Mahesh 1, 김가연 1, 이삼녕 2, 류정호 1. 1 재료연구소, 2 한국해양대학교 PZT thin films have been used for various applications such as transducers, memory devices, actuators, sensors, and electric capacitors for more several decades. Among such various applications of PZT thin films, the capacitors with high energy density and high discharging rate have been attracting attention due to their superior ferroelectric properties and large polarization compare to other materials. As the ferroelectric thin films of the perovskite structure have different polarization characteristics along the crystallographic orientations, the charged energy density can be tailored by these. In this study, we fabricated the crystallographically textured Pb(Zr 0.52 Ti 0.48 )O 3 thin films by sol-gel process and investigated the effect of orientation on the energy storage and discharging capability of the films. The stored energy density of (100)-textured film showed superior to that of others, while the efficiency of it is slightly lower than that of other. It is believed that (100)-textured PZT film has large potential for high performance high energy density capacitors where large energy density and rapid discharging rate are required. P2-G1-2 Enhancement of Dielectric Constant of Alumina/ Fewlayer Graphene Multilayer Composties 이은실 1*, 최기범 2, 심우영 1, 윤대호 3, 김종영 2. 1 연세대학교, 2 한국세라믹기술원, 3 성균관대학교 Graphene-ceramic nanocomposites are becoming import and promising electrionic materials for plasma-resistant applications due to their electro-conductive and mechanically robust (fracture-, wear-, and plasma-resistant) nature. In this work, we present a facile one-pot synthesis of platy alumina/few-layer graphene composite by planetary milling. The resulting composites have electrical conductivity exhibiting percolation behavior (threshold~0.74 vol%) and highly enhanced permittivity (ε~17.3) compared to pure platy alumina (ε~7.3). Percolative permittivity exhibits almost frequency-independent behavior until 10 MHz even though increased dielectric constant arises from interfacial polarization, which can explained by graphene/ graphene oxide (GO) multilayer filler model. After percolation threshold, the permittivity is further enhanced up to ~260 (@1 khz) which amounts to > 35 fold increase, compared to pure platy alumina. Dielectric relaxation is observed for the composites before threshold at high temperature, which arises from interfacial capacitance due to thin graphene oxide layer between FLG platelets. Real permittivity increases up to > 20,000 at 400 o C at low frequency, whereas dielectric loss remains as ε" < 10. High temperature impedance analysis result shows that grain boundary term due to dielectric GO shell of FLG is responsible for microwave dielectric relaxation at high temperature. P2-G1-3 Humidity Sensing Properties of BaTiO 3 Thin Films Prepared by Aerosol Deposition Process Aerosol deposition 공정으로제작한 BaTiO 3 박막의습도센싱특성조명연 *, Jun-Ge Liang, Cong Wang, Zhao Yao, Ming-Qing Liu, 김남영, 오종민. 광운대학교최근이상기후현상과산업기술의발달과함께경제적이며정확하고신뢰성있는습도센서의역할이점차중요해지고있다. 이 중세라믹필름기반습도센서는높은민감도, 빠른응답시간, 장기간의작동안정성의장점으로넓은분야에걸쳐응용분야를확대해가고있다. 또한, 세라믹필름표면의수화민감도는다른습도감지재료보다높기때문에 perovskite 구조를가진 BaTiO 3 강유전체세라믹에대한연구가활발히진행되었다. 하지만, 기존의세라믹코팅공정들은막의재결정화를위해고온혹은여러단계의열처리공정이필수적이다. 고온에서공정을진행하면결합력은우수하지만, 입자들의화학적조성의변화가발생할수있으며코팅층내에기공이생길수있다. 따라서, 본연구에서는상온공정이면서기존공정대비 10 배이상의고속세라믹코팅이가능한 Aerosol deposition (AD) 공정을사용하여 BaTiO 3 박막을제작하였으며, AD 공정으로제작한필름의특별한내부미세구조를착안하여새로운공정을통한고성능습도센서제작의가능성을조사하였다. 이를위해, 600 도이하에서저온열처리한 BaTiO 3 박막의향상된습도센싱특성을박막의결정성과표면및단면미세구조를통해분석하고, BaTiO 3 박막의습도센싱메커니즘을고찰하였다. P2-G1-4 Phase Stability of YBa 2 Cu 3 O 7-δ for the Nominal Composition of Y : Ba : Cu = 1 : 1 : 2.5 in Low Oxygen Pressures 낮은산소분압에서의 Y : Ba : Cu = 1 : 1 : 2.5 조성의 YBa 2 Cu 3 O 7-δ 의상안정성이두호 *, 박인성, 유상임. 서울대학교 We have investigated the phase stability of the YBa 2 Cu 3 O 7-δ (YBCO) compound for the specimens with the nominal composition of Y : Ba : Cu = 1 : 1 : 2.5 in low oxygen pressures (PO 2 ) ranging from 1 to 150 mtorr. Since this nominal composition has been employed for the fabrication GdBa 2 Cu 3 O 7-δ (GdBCO) coated conductors via the Reactive Co-Evaporation Deposition and Reaction (RCE-DR) process, an accurate information on the phase stability of YBCO is prerequisite for the optimal processing of YBCO CCs via RCE-DR. In this study, Y-Ba-Cu-O amorphous precursor films were deposited on LaAlO 3 (001) substrates at 200 C by Pulsed Laser Deposition (PLD). As-deposited amorphous films were annealed at various high temperatures in low oxygen pressures. Experimental results show that the stability boundary of YBCO for this nominal composition is clearly shifted to the lower temperature regions compared with that for the composition of Y : Ba : Cu = 1 : 2 : 3. In the PO 2 regime of 5-20 mtorr, surface morphologies of the films are noticeably changed at temperatures below the YBCO phase boundary. Details will be presented for a discussion. P2-G1-5 Effects of Glass Frit and RuO 2 Addition on the Characteristics of NTC Thermistors NTC 서미스터의특성에미치는 Glass Frit 및 RuO 2 첨가의영향구본급 *, 정동인, 정솔지. 한밭대학교저온동시소성이가능한 NTC 서미스터를개발하기위해 NiO- MnO 2 -Co 3 O 4 계 NTC 서미스터의전기적특성에미치는무연계 Glass frit와 RuO 2 첨가의영향에대하여연구하였다. 먼저무연계 Bi 2 O 3, B 2 O 3, SiO 2 등을이용하여 1100도에서용융한유리를증류수에급냉하여 Glasst를제조하였고이를미분쇄하여 Glass Frit를만든후 NTC 서미스터에 0~20 wt.% 첨가하여 800도 ~1100도에서소결하여 NTC 서미스터를제조하여전기적특성을측정하였다. Glass Frit를 10 wt.% 첨가하여 900 o C에서소결한시편의미세구조가 Glass frit를첨가하지않고 1100도에서소결한시편의미세 한국세라믹학회 159

180 2017 년한국세라믹학회추계연구발표회 구조와유사한시편을얻을수있었다. 그러나시편의저항 - 온도특성을측정한결과 Glass Frit 를첨가하지않은시편에비해저항온도계수인 B 정수는비슷하였으나전반적으로저항이높게나타남을알수있었다. 이와같은문제를해결하기위해저항이낮고저항온도계수가 100 ppm/ o C 로낮은 RuO 2 를첨가하여 NTC 서미스터를제조하여소결온도가 900 도로낮으면서도저항이낮은서미스터를제조하였다. RuO 2 첨가량이많을수록저항이낮게나타남을알수있었다. 그러나 RuO 2 를많이첨가하면 RuO 2 의 + TCR 특성의영향으로 NTC 특성이사라짐을알수있었다. P2-G1-6 Zeolitic Imidazolate Framework-7 Derived ZnO Nanoparticles as a Highly Sensitive and Selective Acetone Sensor Zeolitic Imidazolate Framework-7을통해얻은 ZnO 나노입자의아세톤감응특성윤지원 1*, Rui Wang 1, 박준식 2, 정현묵 1, 이종흔 1. 1 고려대학교, 2 전자부품연구원 Zeolitic Imidazolate Framework-7 (ZIF-7) nanoparticles were synthesized by the precipitation of Zn 2+ using benzimidazole, which were converted into highly uniform and well-dispersed ZnO nanoparticles for gas sensor applications by heat treatment at 500 o C for 24 h. ZnO nanoparticles prepared from ZIF-7 exhibited high surface area and abundant mesopores. The sensor based on ZIF-7 derived ZnO nanoparticles exhibited highest response to 5 ppm acetone (R a /R g = 57.6; R a : resistance in air, R g : resistance under exposure to the gas) at 450 o C and revealed negligible cross-responses to other interfering gases such as ethanol, trimethylamine, ammonia, p-xylene, toluene, benzene, carbon monoxide and carbon dioxide. Synthesis of uniform metal oxide nanoparticles from ZIF precursors can be used to design high performance gas sensors. P2-S12-1 Preferential Orientation Control of Halide Perovskite Thin Film by Flashing Annealing 순간적열처리를통한할라이드페로브스카이트박막의우선배향제어김세윤 1*, 조효정 2, 성시준 2, 이시홍 1, 김대환 2, 허영우 1. 1 경북대학교, 2 DGIST A number of strategies have been developed to improve the coverage, uniformity and morphology of the halide perovskite light absorber. The control of its morphology is very important because the morphology of the perovskite layer has an influence in charge separation and solar cell operation. The surface morphology of the film is determined by the grain orientation because the exposed facets of the grain consist of the planes which have low surface energy. In this study, we report a novel method for (100) oriented perovskite solar cell and its growth mechanism for the first time. A novel method was proposed in one-step spin coating, where N,N-dimethyl sulfoxide (DMSO) was used as a cosolvent in the gamma butyrolactone (GBL) solution containing 1 M of MAI and PbI 2. The microstructure of the perovskite films changed from randomly oriented films with uncovered area to (100) oriented films with uncovered area when annealing temperature increased from 100 to 150, 200 and 300 o C. And finally, the (100) oriented films without uncovered area were formed at 400 o C of annealing temperature. The largest lateral grain size of the oriented perovskite was observed to be more than 20 μm with very flat surface morphology. Also, the orientation of the films was changed by the spinning time of the spin coater. It could be estimated that the thermal energy and the amount of the residual solvent plays a very important role in controlling the (100) oriented perovskite films. P2-S12-2 Halide Perovskite Film Formation Mechanism by Two-step Solution Process: Ripening Growth Model 2단계용액공정의할라이드페로브스카이트박막형성기구 : Ripening 성장모델김세윤 1*, 조효정 2, 성시준 2, 김강필 2, 한정우 1, 김대환 2, 허영우 1. 1 경북대학교, 2 DGIST A number of strategies have been developed to improve the coverage, uniformity and morphology of the light absorber. The solution processed technique using two-step method has been proposed to improve the pore filling, the coverage, and the morphology of the perovskite films. However, there are two problems on two-step process due to the growth mechanism, such as residual PbI 2 and the nonuniform morphology (the existence of the pin-hole with large cuboid grain). It is necessary to understand the formation mechanism in two-step process so as to gain the optimized films, such as the uniform morphology without residual PbI 2. In this study, we discuss an Ostwald ripening growth model via two-step process in the planar structure solar cell, and deal with the causes of the two main problems, such as residual PbI 2 and film morphology. Also, the relation between the residual PbI 2 and the PCE of the planar structure solar cell will be discussed. The compact PbI 2 film is coated on the b-tio 2 layer, and the 0.038, and 0.1 M of MAI solution (CH 3 NH 3 I/isopropanol) were loaded on the PbI 2 films for just 20 sec, respectively, for the model experiment. Using low concentration of MAI solution, the large size and small quantities of the isolated cuboid perovskite grains with nonuniform morphology were observed. However, the continuous films of the perovskite phase with a lot of residual PbI 2 were observed when using high concentration of MAI solution by XRD, FESEM and STEM images. P2-S12-3 Synthesis and Properties of NMP-Based MAPbI 3 Thin Films for Perovskite Solar Cells NMP 용액기반의페로브스카이트태양전지용 MAPbI 3 박막합성및특성연구윤영훈 *, 김세윤, 정희수, 신승학, 백승태, 허영우, 이상욱. 경북대학교최근신재생에너지에대한관심과연구의증가와함께유-무기하이브리드재료를이용한태양전지에대한연구가급속도로증가하고있다. 페로브스카이트결정구조를가지는유-무기하이브리드광흡수층기반의태양전지 ( 페로브스카이트태양전지 ) 는 2009 년 3.8% 의효율을시작으로빠른속도로발전하였고최근 22% 를넘기며그성장을이어가고있다. 이러한 PSC의비약적인성장은비용매를이용한중간상형성기술을기반으로한다. 이방법을통해 Methylammonium lead iodide 페로브스카이트박막을형성하면결정립의크기와두께가균일한고품질막을얻을수있다고보고되었다. 중간상을형성하는형성하는물질은비공유전자쌍을가지며루이스어덕트를형성하는데유리한물질이어야한다고알려져있는데, dimethylsulfoxide (DMSO), thiourea가대표적이다. 본연구에서는, N-methyl-2-pyrrolidone (NMP) 를 methylammonium iodide와 lead iodide 원료용액에혼합하여박막을형성할경우중간상이형성되는것을확인하였다. 이때, NMP 기반중간상의형 160 한국세라믹학회

181 포스터발표 II 성정도를제어하면, 기존 DMSO 기반의방법과는상이한과정으로박막이형성되는것을확인하였다. 또한, 이 NMP 기반의방법으로비교적균일한결정립과균질한페로브스카이트박막을형성할수있었고, 이박막을이용한페로브스카이트태양전지를제작하여소자특성을분석하였다. 본연구는앞으로다양한용매들에대해중간상의존재에대한연구와중간상이페로브스카이트층에미치는영향에대해연구하는데기반이될수있을것으로기대된다. P2-S12-4 Sol-Gel Coating Method of MAPbI 3 Thin Film Using Lead-acetate Solution on Porous Membranes 다공성멤브레인에서의 Lead-acetate 용액을이용한 MAPbI 3 박막의졸-겔코팅법에대한연구신승학 1*, 권승리 2, 진영운 2, 김병조 2, 한만형 2, 한길상 3, 이상욱 1, 정현석 2. 1 경북대학교, 2 성균관대학교, 3 University of Pittuburgh 최근유-무기할라이드페로브스카이트물질은광전소자인태양전지및 LED에유망한물질로떠오르고있다. 유-무기할라이드페로브스카이트는광전소자로응용될때, 일반적으로다양한나노구조체위에코팅된다. 특히 PSCs에서는넓은 coverage와높은 pore-filling이소자의성능을결정한다. 이를위해 Two-step, antisolvent, ion-exchange법등의다양한용액공정과 evaporation, ALD 등의증착공정이연구되고있지만, 충전율이상대적으로낮고비용과공정의문제가있다. 본연구에서는다공성나노구조체위에 MAPbI 3 페로브스카이트층을졸-겔법으로코팅하는연구를진행하였다. Lead-acetate 용액은산화막표면에대한침투성이우수하며, PbO, PbI 2 로의순차적변환에의해 MAPbI 3 로쉽게변할수있다. 이러한특성을이용하여졸-겔법으로다공성 TiO 2 막위에 MAPbI 3 를코팅할때, 솔루션의 aging 시간과열처리승온속도를변수로두어실험하였다. 또한다공성 TiO 2 막외에 TiO 2 나노막대및 Anodic Aluminum Oxide (AAO) 막위에 MAPbI 3 막을코팅하였다. 이러한박막을 FE-SEM, XRD, DTA, TGA 그리고 SIMS 분석을통하여미세구조와물성을관찰하였다. 이를통해 aging된 lead-acetate 용액과낮은승옥속도로열처리하여졸-겔법페로브스카이트막을코팅할때, 기존의용액공정보다넓은 coverage와높은 pore-filling을갖는막을코팅할수있음을확인할수있었다. P2-S12-5 Enhanced Organic-Inorganic Hybrid Perovskite Resistive Switching Memory by Using Guanidinium Lead Iodide and Methylammonium Lead Iodide Guanidinium Lead Iodide와 Methylammonium Lead Iodide 유무기하이브리드페로브스카이트를이용한저항변화메모리김영훈 *, 신현정, 인용재, 서성록. 성균관대학교 Recently, organo-lead halide perovskite materials have received attention for use as resistive switching materials. For example, methylammonium lead iodide (MAPbI 3 ) has been reported as good resistive switching layer operating at low voltage with high on/off ratio (~10 6 ). In the MAPbI 3 -based cell, it showed stable set process (HRS LRS) but unstable reset process (LRS HRS). It can be explained that conducting filaments formed by electric field in the MAPbI 3 layer are not ruptured clearly. We found that guanidinium lead iodide (GAPbI 3 ) also showed resistive switching behavior with low operating voltage and high on/off ratio. However, GAPbI 3 -based cell showed unstable set process, which means conducting filaments were not formed easily. To have optimal conducting filaments, we mixed GAPbI 3 and MAPbI 3 (3:1) and it showed stable set and reset processes. It showed stable write-read-erase-read cycles (~900 cycles), which showed enhanced performance than MAPbI 3 -based cell (~300 cycles). P2-S12-6 Sequentially Vapor Grown Hybrid Perovskite for Planar Heterojunction Solar Cells 순차적기상성장하이브리드페롭스카이트를이용한평면헤테로접합태양전지최원규 1, 나성재 1, 박찬규 1, 우수인 1, Fatma Pinar Gokdemir 2, 문태호 1. 1 단국대학교, 2 Yildiz Technical University High-quality and reproducible perovskite layer fabrication routes are essential for the implementation of efficient planar solar cells. Here, we introduce a sequential vapor-processing route based on physical vacuum evaporation of a PbCl 2 layer followed by chemical reaction with MAI vapor. The demonstrated vapor-grown perovskite layers show compact, pinhole-free and uniform microstructure with the average grain size of ~320 nm. Planar heterojunction perovskite solar cells are fabricated using TiO 2 and spiro-ometad charge transporting layers in regular n-i-p form. The devices exhibit a best efficiency of 11.5% with small deviation indicating the high uniformity and reproducibility of the perovskite layers formed by this route. P2-S13-1 Mechanically Induced Metal-insulator Transition in NdNiO 3 Thin Films NdNiO 3 박막에서기계적자극에의한금속-절연체전이김성호 1*, 설대희 1, 오차돌 2, 허승양 2, 김영민 1, 손준우 2, 김윤석 1. 1 성균관대학교, 2 포항공과대학교 Metal-insulator transition (MIT) of transition metal oxides has been studied widely for applying resistive switching memories. Among the various candidates for this application, NdNiO 3 (NNO) thin film, which is one of the families of rare-earth perovskite nicklate materials, has been extensively examined due to its sharp MIT properties that can be controlled by temperature, electric field and doping. Recently, it was reported that MIT can be effectively induced through mechanical stimuli in oxide thin film. In this presentation, we explore mechanically induced MIT in NNO thin films using atomic force microscopy (AFM). We observed pre-formed conducting spots using current-afm and showed that they can be switched to high resistive state by mechanical stimuli. In addition, scanning transmission electron microscopy (STEM) combined with energy dispersive X-ray spectroscopy (EDX) revealed that the conducting spot can be related to the bucket-type Ni deficient region in NNO thin film. The observed results demonstrate presence of the mechanically induced MIT and its mechanism in NNO thin films. P2-S13-2 Electromagnetic Interference (EMI) & Heat-dissipating Properties of Sheet Used as Filler of Al-Al(OH) 3 Core-shell Structure Al-Al(OH) 3 코어쉘구조의필러가충진된시트의전자파차폐-방열특성평가문수인 1,2*, 허훈 1, 윤종원 2, 박춘근 1, 유은성 1. 1 한국생산기술연구원, 2 단국대학교 In high integrated electronic devices, generated heat and electromagnetic interference (EMI) cause a lot of performance problems. 한국세라믹학회 161

182 2017 년한국세라믹학회추계연구발표회 Many techniques such as heat-dissipating & EMI shielding sheet have been developed to control the heat and EMI. The sheet consists of matrix resin and filler having thermal conductivity and shielding EMI. Aluminum is widely used as a filler because it is highly thermal conductivity (237 W/m K) and reflection effect. But metal filler can result in malfunctioning of the electronics by electrical conductivity and limit to apply to insulated devices. So, we coated Al(OH) 3 insulating materials on the surface of Al powder to make core-shell structured filler and observed electrical, thermal, EMI shielding properties using LCR-meter, Hipot test, Thermal conductivity and network analyzer. In result, the shell of Al@Al(OH) 3 over 170 nm thickness have similar to Al 2 O 3 resistance [21.36 kv, base on 1 MHz]. The silicone sheet having Al@Al(OH) 3 filler of breakdown voltage is 1.72 kv. The voltage is higher sheet of Al filler [0.45 kv]. Thermal conductivity of sheet using filler Al, Al 2 O 3, Al@Al(OH) 3 have 0.91, 0.48, and 0.81 respectively. EMI shielding effectiveness have 40, 6, 25db in GHz. Therefore, we observed Al@Al(OH) 3 filler be possible to apply heat-dissipating & EMI shielding sheet and also in various devices. P2-S13-3 Enhanced Responsivity of Solution-Processed ZnO Ultraviolet Phototransistor by Introducing Highly Conductive SnO 2 Thin Film Layer 고전도성 SnO 2 박막의도입으로인한용액공정 ZnO 자외선포토트랜지스터의응답성향상최호중 *, 서세훈, 송재선, 박성주, 이상한. 광주과학기술원 Although the ZnO-based ultraviolet (UV) phototransistors have drawn a significant interest due to unique properties of ZnO, phototransistors with only single-layer ZnO have exhibited still low electrical and UV photoresponse characteristics. The electrical and UV photoreponse characteristics of ZnO single-layer UV phototransistor are considerably improved by inserting of highly conductive SnO 2 front layer. The photogenerated electrons from ZnO UV sensitive layer transfer readily to highly conductive SnO 2 carrier transport layer because ZnO has higher conduction band than SnO 2 and fast recirculation through the SnO 2 carrier transport layer contributes to improvement of the UV photoresponse of the SnO 2 / ZnO bilayer UV phototransistor. Here, we report the feasibility of the low cost, large scale and high performance solution-processed SnO 2 / ZnO bilayer UV phototransistor with enhanced electrical and UV photoresponse characteristics. The responsivity and detectivity of SnO 2 /ZnO bilayer UV phototransistor are considerably enhanced than those of ZnO single-layer UV phototransistor. This high UV photoresponse characteristics can be further enhanced by applying the gate voltage (V GS ). P2-S13-4 Characteristics of NdNiO 3 Synthesized in the Ambient of Oxygen Gas by Using Solid State Reaction Method 박정웅 *, 김상모, 당예, Nguyen Thi Nguyen. 가천대학교 Perovskites RNiO 3 (R = Pr, Nd, La, Sm) have been studied due to their interesting ferroelectric, magnetic and optical, transport properties, including the occurrence of a metal-insulator transition at temperatures (< 400 K). Among them, NdNiO 3 are well known for metal-insulator transition depending on temperature and their phase diagram is controlled by the Ni-O-Ni bond angles. In this study, we prepared NdNiO 3 powers by using modified solid using modified solid state reaction method in the atmosphere of oxygen gas. NdNiO 3 powder was blended with NiO 3 and NiO 3 powders thoroughly at the stoichiometric ratio in a ball mill (200 rpm at room temperature) for 24 h, dried in an oven at a temperature of 100 C. Mixed Nd 2 O 3 and NiO 3 powders was calcined at the temperature of C for 3 h in oxygen gas atmosphere. After calcination for 3 hour, all detected XRD peaks were well matched with peaks of standard ABO 3 structure. To investigate metal-insulator transition of samples, As-prepared powders were pressed at a pressure of ~50 MPa and then sintered at 1300 C. NdNiO 3 films were fabricated using rf sputtering system in the ambient gas mixture of argon and oxygen. Their electrical and structural properties of as-prepared NdiO 3 films were investigated. P2-S13-5 The Effect of Eu 2+ Concentration in Ca 4 (PO 4 ) 2 O:Eu 2+ Red Emitting Phosphor Synthesized by Sol-Gel Method for LED Application LED 응용을위한 Sol-gel법으로합성한 Ca 4 (PO 4 ) 2 O:Eu 2+ 적색형광체의 Eu 2+ 농도에따른형광특성변화연구홍우태 *, 이성제, 박성준, 양현경. 부경대학교 Currently, white light emitting diodes (WLEDs) combined with blue LEDs and yellow phosphors are popular lighting source because of the long working lifetime and high luminous efficiency. However, these white LEDs exhibits a low color rendering due to the lack of red emission. To solve this problem, addition of red phosphors in the white LEDs is emerging solution. There are many studies about red phosphors with blue excitation, for example nitrate, sulfate based phosphor. Recently, phosphate compounds have emerged as important host materials because of their low synthetic temperature, high conversion efficiency, high physical and chemical stability, and ease of control over particle size. Among the phosphate materials, Eu 2+ doped tetracalcium phosphate (Ca 4 (PO 4 ) 2 O:Eu 2+ ) phosphors emit a red light centered 669 nm with blue excitation that can be applied as red phosphor in white LEDs. In past study, the tetra-calcium phosphate was synthesized by solidstate reaction that have disadvantages, such as long reaction time and high reaction temperature and irregular morphology. Owing to oxygen atom in chemical composition of tetra-calcium phosphate, a synthesis of tetra-calcium phosphate based on solution were regarded as impossible way. In this study, the Ca 4 (PO 4 ) 2 O:Eu 2+ phosphors were synthesized by sol-gel method with different Eu 2+ concentration. The effect of Eu 2+ concentration on the structural, surface morphology and luminescence properties of the Ca 4 (PO 4 ) 2 O:Eu 2+ phosphors are discussed. P2-S13-6 Deep Red-emitting Ca 14 Al 10 Zn 6 O 35 : Mn 4+ Phosphor for Blue-converted White LEDs 청색 LED 기반의백색 LED에적용가능한 Ca 14 Al 10 Zn 6 O 35 : Mn 4+ 적색형광체의형광특성연구박진영 1*, 정종원 2, 양현경 1. 1 부경대학교, 2 창원대학교 The basic requirements of red phosphors for LED are including significant absorption in blue light, high quantum efficiency of red emission, high thermal quenching temperature and high physical and chemical stability. At present, rare-earth ions for red emitted activator 162 한국세라믹학회

183 포스터발표 II such as Eu 3+, Pr 3+ and Sm 3+ have been widely reported. However, their application on WLEDs are not suitable due to high price of rare-earth ions and their sharp absorption peaks in UV to blue regions. Recently, Mn 4+ activated luminescent materials are considered as a good redemitting phosphor candidate for warm WLEDs. Under the UV or blue light irradiation, the emission spectrum of Mn 4+ ion typically dominated by the narrow emission bands in the red region between 620 and 760 nm. Additionally, the absorption spectra exhibit two broad bands between UV and blue region corresponding to the 4 A 2g 4 T 2g and 4 A 2g 4 T 1g (4F) spin-allowed transitions. Thus, it is noted that Mn 4+ ions can be used as an activator for synthesizing the red phosphors. In this work, a novel deep red emitting Ca 14 Al 10 Zn 6 O 35 :Mn 4+ phosphors were synthesized by a citrate sol-gel method. The structural and optical properties were evaluated. Finally, a warm WLEDs were successfully fabricated by using a blue chip LED combined with YAG:Ce 3+ phosphors and Ca 14 Al 10 Zn 6 O 35 :Mn 4+ phosphors. P2-S13-7 Template Engineering of Epitaxial BiVO 4 Photoanode for Efficient Water Splitting 효율적인물분해를위한단결정 BiVO 4 광전극성장송재선 1*, 차재성 1, 이미경 2, 정혜원 3, 서세훈 1, 유지애 1, 김태민 2, 이종민 1, 노희성 1, 김도현 4, 정상윤 1, 안현지 1, 이병훈 1, 박정웅 4, 박현웅 3, 장호원 2, 이상한 1. 1 광주과학기술원, 2 서울대학교, 3 경북대학교, 4 가천대학교 Bismuth vanadate (BiVO 4 ) has been received much attention as a promising photoanode material for hydrogen production by photoelectrochemical (PEC) water splitting due to narrow optical band gap and suitable band edge positions for water oxidation. However, unfortunately, the actual photoactivity of BiVO 4 is considerably limited by poor electron transport and slow water oxidation kinetics. In this regard, although many studies have been carried out to improve photo-efficiency by the enhancement of electron transport and water oxidation kinetics of BiVO 4, there are few researches on the growth of epitaxial BiVO 4 to explore fundamental properties of BiVO 4 for PEC water splitting because extremely flat epitaxial films is poor in photoefficiency due to its low surface active area. Here, we report the growth of epitaxial BiVO 4 using thin γ-wo 3 template layer deposited on SrTiO 3 (001) substrate covered by SrRuO 3 (SRO) bottom electrode by using pulsed laser deposition (PLD). Consequently, at 1.23 V RHE (reversible hydrogen electrode), the photocurrent density of epitaxial BiVO 4 on γ-wo 3 template layer (2.20 ma cm -2 ) are approximately 10 times higher than that of bare BiVO 4 due to the effective charge transfer by γ-wo 3 intermediate layers and subsequently the increase of surface active area of epitaxial BiVO 4. This study strongly suggests that epitaxial BiVO 4 grown by using template layer can be a cornerstone for an in-depth understanding of fundamental properties of BiVO 4 itself for PEC water splitting. P2-S13-8 Multiferroic Fe, Co doped Bi 3.25 La 0.75 Ti 3 O 12 Film with CoFe 2 O 4 Fe, Co 도핑을통해자기조립된 CoFe 2 O 4 를갖는 Bi 3.25 La 0.75 Ti 3 O 12 박막안현지 1*, 정순길 2, 김정규 3, 이종민 1, 김상모 4, 한준영 4, 송재선 1, 정상윤 1, 김소영 1, 이병훈 1, 박두선 2, 고경태 3, 박정웅 4, 이상한 1. 1 광주과학기술원, 2 성균관대학교, 3 포항공과대학교, 4 가천대학교 Multiferroic materials have recently attracted attention due to novel functionality by magnetoelectric coupling between ferroelectric and magnetic orders. However, multiferroic materials at room temperature are unusual. For this reason, several multiferroic materials with selfassembled CoFe 2 O 4 (CFO) have been reported by fabricating ferromagnetic CFO nanocomposite in ferroelectric films. However, the CFO mixed target transforms ferroelectric structure, furthermore it also causes degraded ferroelectricity. Especially, in case of the ferroelectric Bi 4 Ti 3 O 12 (BiT), the BiT structure converted to similar Bi 5 Ti 3 FeO 15 (BTFO) phase, although epitaxial BTFO-CFO film, shows multiferroic properties at 10K. Here, we report multiferroic Fe, Co doped BLT films with CFO at room temperature. Furthermore, we verified that the self-assembled CFO can be also observed in the BLT film by simple Fe, Co doping, not CFO mixed target. In order to optimize multiferroic properties, epitaxial Bi 3.25 La 0.75 Ti 2 (Fe x Co 1-x )O 12 (x = 0, 0.5, 0.65, 1) films were grown on SrTiO 3 by pulsed laser deposition. Fe, Co co-doped BLT films have CFO phase and also have ferromagnetic properties, unlike each Fe-BLT, Co-BLT films. Additionally, only BLFCT (Fe:Co = 1:1) film has multiferroic properties at room temperature because excess Fe doping generates transformation of BLT and CFO structure. It is expected that novel multiferroic film with CFO phase are revealed through applying this simple doping in the ferroelectric films. P2-S13-9 Synthesis of Superparamagnetic Fe 3 O 3 Core- Shell Colloids 초상자성체 Fe 3 O 3 코어쉘콜로이드합성서호준 *, 문건대. 한국생산기술연구원 Manipulation of the initial structures of nanocrystals is desired to integrate the ability to harness the size-dependent properties of individual nanocrystals with the possibility to control collective properties due to interations between the subunits. Herein, we report the synthesis of magnetically-movable Fe 3 O 3 core-shell colloids based on superparamagnetic magnetite nanocrystals and chemical transformation. The water-dispersible magnetite colloidal nanocrystal clusters have uniform size range from about 30 to 200 nm. The magnetite nanocrystal clusters can be coated with metal oxides to form core-shell structures without losing the superparamagnetic nature of magnetite nanocrystals. P2-S13-10 Electrical Performance and Humidity Sensing Properties of All Oxide based Flexible and Ultra-thin TFTs 산화물기반투명한초박형유연 TFT의전기적특성및우수한습도센싱특성정성현 *, 김경수, 안철현, 조형균. 성균관대학교최근 Internet on Things (IoT) 라하여가전제품, 모바일장비및웨어러블소자등다양한임베디드시스템과인터넷을연동하여생체정보, 보완신호나외부환경변화에대한정보를습득할수있는스마트한센서소자에대한관심이급증하고있다. 이러한차세대스마트센서는신체나곡률반경을가진물체에부착, 삽입하여외부환경변화를감지하는데사용될것이라고예상되며센서의활용성을높이기위해선유연성, 저전력구동, 전면투명성과더불어환경변화에대한높은반응특성을갖는소자를제작하는것이중요한요소기술이다. 한국세라믹학회 163

184 2017 년한국세라믹학회추계연구발표회 본연구에서우리는약 5 µm 초박형 parylene 기판위에높은이동도 / 안정성 / 투명성을가지는 InGaZnO (IGZO) 채널층및 InSnO (ITO) 투명전극을사용한전면투명의초박형유연 thin film transistor (TFT) 소자를제작하였고전기적특성평가및 bending test 를통해기존의불투명한금속을사용한초박형유연소자와물리적인특성을분석하였다. 또한상대습도 (30-90%) 별제작된 a- IGZO TFT 의전기적특성변화를확인하여비인지형의 a-igzo TFT 의습도 sensor 로써의가능성을제시하였다. P2-S13-11 Analysis Gas Sensing Property of a-igzo Thin Film Transistor based NO 2 Gas Sensor via Deposition Condition 증착분위기에따른 a-igzo 박막트랜지스터기반이산화질소가스센서의센싱특성분석김경수 *, 안철현, 정성현, 조형균. 성균관대학교 For high selectivity and responsibility, metal oxide based gas sensors have been studied. When NO X gas is attached to film, the oxidation gas withdraws major carriers of metal oxide film result in reduce conductivity of metal oxide film. But typical gas sensors have low sensitivity against target gas. With intrinsic characteristic of TFT and possibility to control conductance of channel layer by gate voltage TFT type gas sensor has possibility which is higher sensitivity performance against oxidation gas than resistor type gas sensor. Amorphous InGaZnO (a-igzo) TFT has superior electrical performance; low off current, high mobility, availability for large scale. Besides its outstanding electrical performance, a-igzo TFT can easily react with oxidation gas. Nevertheless, study of a-igzo TFT for gas sensor is leak. Also none of group study the gas sensing property against conductivity of channel with TFT type gas sensor. In this study, we analysis relation between conductivity of channel and sensitivity against oxidation gas by controlling gas ratio during deposition. Oxidation gas attached on channel surface can change carrier concentration of a-igzo channel and as a result electrical performance can be change. When we deposited channel layer, we change deposition conditions such as Ar/O 2 gas ratio to control amount of oxygen vacancy which act as carriers into a-igzo channel layer. Then we compare gas sensing properties against oxidation gas between high conductivity and low conductivity a-igzo TFT. P2-S13-12 A Comparative Study of DFT+U Functionals: Double Counting, Spin Density, and Hund Interaction DFT+U 범함수의비교분석연구 : 중복셈, 스핀밀도, 훈트상호작용이시헌 *, 한명준. KAIST A systematic study has been performed to investigate the DFT+U (density functional theory + U) functionals. Motivated by the recent DFT+U studies reporting unreasonable Hund interaction (J) dependence in several transition metal compounds, we focused on the J-dependence in DFT+U. To understand the general behavior of the method, a comprehensive analysis of DFT+U formulations and their relation to standard exchange-correlation functionals are provided. Two representative double counting forms, namely fully localized limit and around mean-field, are also investigated. Unphysical J- dependence originated from the spin density energy is clearly noticed in energetics and spin up/down potentials for both double countings. Applications to different types of materials (MnO, NiO, SrRuO 3, and BaFe 2 As 2 ) are also performed using our new implementation into OpenMX software package. It further elucidates the undesirable effects on the ground state magnetic properties arising from the spin density. We demonstrate that a common practice of using DFT+U based on the spin density exchange-correlation functional has a serious drawback in predicting material properties while the theory based on the charge-only density functional is a promising scheme. P2-S13-13 First-principles Prediction of Magnetic Ground State of Correlated Oxides: the Case for LaMnO 3 강상관계산화물의자성바닥상태에대한제일원리예측 : LaMnO 3 장승우 *, 이시헌, 윤홍기, 한명준. KAIST LaMnO 3 is one of the prototypical materials in which charge, spin and orbital degree of freedom play together in producing complicated phase diagram. Despite of its long history, it is still challenging to correctly describe the magnetic ground state of LaMnO 3 from firstprinciples [1-3] due to many technical and fundamental issues among which most serious are the determination of interaction parameters and the intriguing dependence on the DFT and DFT+U functional formalisms [4]. In this study, we try a fully ab-initio prediction of bulk LaMnO 3. To estimate interaction parameters (Hubbard U and Hund J), we used constrained random phase approximation (crpa) method. With these parameters and spin-unpolarized DFT+U with FLL (fully localized limit) double counting, we successfully obtained the A-type antiferromagnetic ground state with Mott-Hubbard gap (rather than the charge transfer type). On the contrary, the combination of different values of interaction parameters as well as the DFT+U formalisms can easily lead to the unphysical magnetic ground state solutions. [1] H. Sawada and K. Terakura, Physical Review B 58, 6831 (1998) [2] T. Hashimoto et al., Physical Review B 82, (2010) [3] T. A. Mellan et al., Physical Review B 92, (2015) [4] S. Ryee and M. J. Han (submitted) P2-S13-14 Quantified Degeneracy and its Application to Transition-metal Oxides 정량화된축퇴수와전이금속산화물에의응용심재훈 1*, 이시헌 1, 이훈표 2, 한명준 1. 1 KAIST, 2 강원대학교 While degeneracy can play an important role in determining the material characteristics, e.g. metal-insulator transition, there is no well-defined way to quantify it in real materials having complicated band structure. In this presentation, we suggest a way to quantify the effective degeneracy by introducing entropy-like terms. This new quantity well describes the electronic behaviors of the real materials, i.e., transition-metal oxides. DFT+U and +DMFT calculations of the 3d titanates, 4d ruthenates, and 5d iridates show that the effective degeneracy'''' provides useful insight to understand these systems and their origin of metal-insulator transition. P2-S13-15 Electron-lattice Coupling in Correlated Materials of Low Electron Occupancy 전자가적게점유되어있는강상관계물질에서전자와격자의상호작용엄기태 1*, 최민수 1, 송경 2, 최시영 3, 이대수 4, 엄창범 5, 이재찬 1. 1 성균관대학교, 2 포항공과대학교, 3 재료연구소, 4 서울대학교, 5 위스콘신주립대학교 164 한국세라믹학회

185 포스터발표 II In correlated materials including transition metal oxides, electronic properties and functionalities are modulated and enriched by couplings between the electron and lattice degrees of freedom. These couplings are controlled by external parameters such as chemical doping, pressure, magnetic and electric fields, and light irradiation. However, the electron-lattice coupling relies on orbital characters, i.e., symmetry and occupancy, of t 2g and eg orbitals, so that a large electron-lattice coupling is limited to eg electron system, whereas t 2g electron system exhibits an inherently weak coupling. Here, we design and demonstrate a strongly enhanced electron-lattice coupling in electron-doped SrTiO 3, that is, the t 2g electron system. In ultrathin films of electron-doped SrTiO 3 [i.e., (La 0.25 Sr 0.75 )TiO 3 ], we reveal the strong electron-lattice-orbital coupling, which is manifested by extremely increased tetragonality and the corresponding metal-toinsulator transition. Our findings open the way of an active tuning of the charge-lattice-orbital coupling to obtain new functionalities relevant to emerging nanoelectronic devices. P2-S13-16 Enhanced NO 2 Sensing Characteristics of rgo- In 2 O 3 Sensor on Flexible Substrate 이산화질소감지특성향상 rgo-in 2 O 3 유연기판센서나찬웅 1*, 김재혁 2, 김효중 3, 우형식 2, Arunava Gupta 4, 김한기 3, 이종흔 2. 1 한국생산기술연구원, 2 고려대학교, 3 경희대학교, 4 University of Alabama In 2 O 3 porous sphere and rgo-in 2 O 3 nanostructure were prepared by a solvothermal route and their gas sensing characteristics were investigated. In 2 O 3 porous sphere showed a response (resistance ratio) of 1.4 when exposed to 0.5 ppm NO 2 at 150 o C. The response to 0.5 ppm NO 2 was significantly increased to 22.3 with In 2 O 3 -rgo nanostructure. In addition, selectivity to NO 2 was also enhanced by p- n junction between the p-type rgo and n-type In 2 O 3. The enhancement of the gas sensing characteristics was attributed to the expansion of the electron depletion layer in In 2 O 3 nanoparticles by forming a nano-scale p-n junction. The rgo-in 2 O 3 hybrid materials on ITO/APC/ITO/CPI provides a simple and robust tool to control both the gas selectivity and the gas sensitivity. P2-S13-17 Electrical Conductivity of Black BiOCl 블랙BiOCl의전자전도도명윤 1*, Wenshen Song 2, Layla Mehdi 3, Nigel D. Browning 3, Andrey Krayev 4, 박정희 5, Li Yang 2, Parag Banerjee 2. 1 세종대학교, 2 Washington University in St.Louis, 3 Pacific Northwest National Laboratory, 4 AIST-NT Inc., 5 고려대학교 We studied conductivity switches from p-type of BiOCl to n-type of black BiOCl with generated oxygen vacancies by UV illumination at the exposed (001) surface. This n-type conductivity occurs by formation of oxygen vacancy at the surface of BiOCl nanosheets, confirmed by XPS spectra that oxygen vacancy gradually increasing as a function of UV illumination time. The raman spectra shows oxygen vacancy related vibration mode was rising under 2 mtorr and low temperature PL, the result reveals decreasing band edge emission of BiOCl due to high density oxygen vacancies placed under conduction band edge of black BiOCl. The oxygen partial pressure 1/4.05 dependent electrical conductivity shows σ = po 2 with a positive slope under low pressure region for the BiOCl and σ = po 2 1/5 with a negative slope under atmospheric region for the black BiOCl. P2-G2-1 Formation of Ruddlesden-Popper Faults and Oxygen Electrocatalysis in LaNiO 3 Thin Films LaNiO 3 박막에서 Ruddlesden-Popper 결함의형성과전기화학적산소촉매활성의향상박주미 *, 배형빈, 정성윤. KAIST Two-dimensional homologous Ruddlesden-Popper (RP) faults are generated in LaNiO 3 thin films via simple control of the cation nonstoichiometry. Here, we demonstrate that strong tetragonal distortion of [NiO 6 ] octahedra is induced by more than 20% elongation of Ni-O bonds in the faults, directly visualized by scanning transmission electron microscopy. Furthermore, we identify that the distortion in the faults lead to remarkably higher electrocatalytic activities than other surface sites during the electrochemical oxygen evolution reaction. For oxide-based electrocatalysts, atomic-scale direct probing of active sites and subsequent verification of the structure-activity relationship are important issues to increase electrochemical conversion efficiency. Therefore, this obvious evidence of the octahedral distortion and its impact on electrocatalysis in LaNiO 3 suggests that the formation of RP-type faults can be an efficient way to control the octahedral geometry and considerably enhance the oxygen catalytic performance of perovskite oxides. P2-G2-2 A Study of TiO 2 based Oxide Composites as Anode Material for Li-ion Battery TiO 2 기반산화물복합체의리튬이온전지음극재적용연구황태연 1,2*, 김희진 1, 윤종원 2, 허훈 1. 1 한국생산기술연구원, 2 단국대학교 A lithium ion battery is an energy storage device based on electrochemical reactions. At present, graphite is a most used anode material owing to high coulombic efficiency but it has a disadvantage that reversible capacity (372 mah/g) is limited by the LiC 6 stoichiometry and it has low power density due to slow diffusion rate. In this study, we prepared oxides based composites to replace graphite as the anode material, and it was applied as the anode of the lithium ion battery. Lithium ion batteries based on TiO 2 have advantages such as high stability, safety, and it has an operating voltage in range of 1.5~1.8 V (vs.li/li + ). On the other hand, SiO 2 has a strong Si-O bond and low electrical conductivity, which limits research on secondary batteries. In this experiment, SiO 2 was added to TiO 2 to form Ti-O-Si bonds to confirm the reactivity with Li-ion, and compared with TiO 2 single phase. Also, since oxides have low electric conductivity, we added a modified-cnt with high electric conductivity to improve cells performance. And we fabricated halfcoin cells after characterization of the composites. Finally, cyclic voltammogram, galvanostatic charge/discharge characteristics and electrochemical impedance spectroscopic characteristics were analyzed. P2-G2-3 Electrochemical Properties of Mn-doped LaFeO 3 Nanofiber Synthesized by Electrospinning 전기방사로제작된망간이도핑된란탄페라이트나노섬유의전기화학적특성 한국세라믹학회 165

186 2017 년한국세라믹학회추계연구발표회 정중훈 *, 윤종원, 한진주. 단국대학교 Mn-doped LaFeO 3 nanofibers were successfully prepared by electrospinning. The X-Ray Diffraction (XRD) pattern of the Mndoped LaFeO 3 fibers indicated nanofibers with orthorhombic perovskite crystalline structure without secondary phase. Transmission Electron Microscopy (TEM) image revealed that the Mndoped LaFeO 3 nanofibers were composed of the fine particle about nm. From the XPS analysis, the chemical composition of the Mn-doped LaFeO 3 nanofiber was confirmed as stoichiometric LaFeO 3. LaFeO 3 nanoparticle with a crystallite size about 100 nm has C s of 15 F/g. But LaFeO 3 nanofibers with a diameter of nm and crystallite size about 45 nm have C s of 38 F/g. Also, Mn 15 mole% doped LaFeO 3 nanofibers found to have a crystallite size of 25 nm and C s of 138 F/g. It is 3.63 times higher than pure LaFeO 3 nanofiber the value. The increase in the specific capacitance is thought to be due to the decrease in crystallite size and the rise in oxygen vacancy, that are caused higher reaction surface area. In other words, the enhanced oxidation-reduction reaction at the surface resulted in outstanding specific capacitance. A lso, Mn doped LaFeO 3 is a material with thermal stability and is expected to be useful for high temperature capacitors. P2-G2-4 Fabrication and Microstructure of Zn doped CeO 2 Nanoparticles by Hydrothermal Process 수열합성을통해합성한 Zn을도핑한세리아나노분말의합성및미세구조분석배동식 *, 이원준, 손정훈. 창원대학교 Zn doped CeO 2 nanoparticles were prepared under low temperature and high pressure conditions by precipitation from metal nitrates with aqueous ammonium hydroxide. Zn doped ceria nanoparticles were obtained by a reaction at the temperature range of 120 o C~180 o C for 2~10 h. The average size and size distribution of the synthesized particles were around 10nm and narrow, respectively. The specific surface area of the synthesized Zn doped CeO 2 nanoparticles above 100 m 2 /g. The XRD diffraction pattern shows that the synthesized powders were crystalline. The effects of synthesis parameters, such as the reaction temperature and time, are discussed. P2-G2-5 Synthesis and Characterization of Ru doped CeO 2 Nanopowders by a Solvothermal Process 용매열공정을이용한 Ru doped CeO 2 나노분말합성및분석배동식 *, 옥지영, 손정훈. 창원대학교 Ceria nanoparticles have long been investigated and used as catalyst. Ceria has unique redox cycle and this resulting in high oxygen storage capacity (OSC). It is well known for its role in three way catalyst and these unique properties derived from redox properties. And its catalytic behavior can be improved by doping the metal ions in CeO 2, which can be possibly activate the lattice oxygen. Ru doped CeO 2 was synthesized by a solvothermal process. The synthesized nanoparticles were characterized by FE-SEM, XRD, EDS and BET. The average size and distribution of the synthesized Ru doped CeO 2 was about 5-10 nm and narrow respectively. The effect of the solvents, reaction time and reaction temperature on particle size and morphologies were studied. P2-G2-6 Fabrication and Characterization of Cu doped CeO 2 Nanopowders by Hydrothermal Process 수열합성법을이용한 Cu doped CeO 2 나노분말합성및특성분석배동식 *, 최연빈. 창원대학교 Cu doped CeO 2 nanoparticle is synthesized reaction at 120~180 o C for 2~10 h. The average size and distribution of the synthesized Cu doped CeO 2 was controlled by reaction temperature and times. The synthesized Cu doped CeO 2 was characterized by FE-SEM, XRD and BET etc. The average size and distribution of the synthesized Cu doped CeO 2 was below 10 nm and narrow, respectively. The shape of the synthesized Cu doped CeO 2 powders was spherical type. The average size of synthesized Cu doped CeO 2 decreased with reaction times and temperature decreased. The specific surface area of the synthesized Cu doped CeO 2 was above 100 m 2 /g reaction at 150 o C for 2 h. P2-G2-7 Characterization and Synthesis of Silver doped Ceria Nano Particle by a Hydrothermal Processing 수열합성법으로은도핑세리아나노분말합성및특성배동식 *, 이동규, 손정훈. 창원대학교 CeO 2 는높은산소저장능력 (OSC) 으로인해 3원촉매에사용되고있다. 본연구에서는 CeO 2 의산소저장능력을향상하기위하여 Ag 를첨가하였다. 나노크기의은첨가세리아를합성하기위하여수열합성법을적용하였다. 세리아전구체는 Ce(CH 2 CO 2 ), 은전구체는 AgNO 3 를사용하였고, ph 조절을위하여 NH 4 OH를사용하였다. 반응온도는 o C에서 2-10시간동안반응하여합성하였다. 합성된분말의특성평가는 X-ray diffraction (XRD), 전계방사형주사전자현미경 (FE-SEM), 비표면적측정 (BET), 성분분석 (EDS) 으로분석하였다. 합성된은첨가세리아분말의평균입자크기는 10nm이하이고, 분포는균일하였다. 합성된은첨가세리아입자의결정성을 XRD로측정한결과 cubic상이였다. 120 o C에서 2시간반응하여합성한분말의비표면적은 100 m 2 /g 이상을얻었다. P2-G2-8 Synthesis of Silicon Anodes via Alloying with Inert Metals for Enhancing Electrochemical Performance of Lithium Ion Battery 리튬이온배터리의전기화학적특성향상을위한금속-실리콘합금음극재의합성권성우 *, 홍성현. 서울대학교실리콘 (Si) 은가장높은이론용량을갖는리튬이온전지의음극재로써, 상용화되어있는흑연계음극재의낮은용량을대체할수있는소재로주목받고있다. 그러나실리콘은리튬이온의삽입시큰부피팽창으로인해낮은수명특성을보이고, 낮은전기전도도를보인다는문제점을갖고있다. 따라서, 실리콘음극재의리튬이온의삽입시구조를유지할수있는완충층 (buffer layer) 를제공함과동시에낮은전기전도도를개선할수있는디자인이필요하다. 3 M과일진전기등의기업에서실리콘물질에금속합금을코팅해기존의문제점을해결할수있다고발표한바있다. 특히, 3 M에서는기존의흑연음극재와새로운실리콘합금음극재를병용하여같은부피에서더높은용량을갖는배터리를확보하였다고발표하였다. 본연구에서는다양한금속물질로코팅한실리콘음극재를합성하는방법에대하여고찰하였다. 금속전구체가들어있는용액에실리콘입자를투입해에이징시킨후, 건조및수소분위기에서의열처리를통하여실리콘입자와금속전구체를간단히반응 166 한국세라믹학회

187 포스터발표 II 시킬수있었다. 이러한반응은짧은시간내에반응이가능하며, 조성제어가매우쉽다는장점을갖고있다. 또한, 마그네슘환원또는금속을활용한 chemical etching 을통해실리콘에 pore 를형성하여금속이실리콘에잘흡착될수있는조건을제공하고자하였다. 본연구에서합성한금속 - 실리콘음극재는금속및금속규화물이완충층으로작용하여실리콘음극재의부피팽창을막을수있으며, 금속의높은전기전도도로인해향상된전기화학적특성을얻을수있다. 그결과로 85% 이상의높은초기효율및 100 사이클이상의안정적인수명특성을갖는음극재를합성하였다. P2-G2-9 V 4 P Nanocomposite as a High Performance Anode Material for Lithium-Ion Batteries 리튬이온전지용음극소재 V 4 P 나노복합체의합성및특성평가김경호 *, 정철호, 홍성현. 서울대학교 There are active researches on new electrode materials for lithium-ion batteries (LIBs) in order to enhance their electrochemical properties for various portable electronic and electric vehicle (EV) applications. To search for better anode materials for LIBs, a wide range of compounds including metals, alloys, oxides, phosphides, and sulfides have been extensively investigated. In particular, metal phosphide group have attracted much attention due to their high degree of electron delocalization leading to a low oxidation state of the metal and also to a strong covalent character of the bonding between metal and phosphorus. As a result, metal phosphide shows an overall lower insertion potential compared to the counterpart oxides. In the present study, we firstly synthesized the V 4 P 7 using high energy mechanical milling and introduced as an anode material for LIBs. The electrochemical properties and reaction mechanisms between V 4 P 7 and Li + were investigated. The V 4 P 7 electrode delivered a high discharge and charge capacities of 1035 and 882 ma h g -1 with a high initial coulombic efficiency of 85% at current density of 100 ma g -1. To enhance their electrochemical properties, V 4 P nanocomposites were prepared by carbon coating method using dopamine as the carbon source, and these composites showed the enhanced cycle retention properties. P2-G2-10 Effect of TiO 2 Coating on SEI Layer Formation of SnO 2 Thin Film Anode for Lithium Ion Battery 리튬이온전지음극재용 SnO 2 박막의 SEI 층형성에 TiO 2 코팅이미치는영향김형호 *, 홍성현. 서울대학교주로휴대폰등모바일 IT 기기의전원으로사용되고있는리튬이온전지는기술이발달함에따라자동차및에너지저장등의더큰저장용량을필요로하는용도로사용이확대되어다양한후보소재군에대한연구들이활발히이루어지고있다. 또한, 부피팽창이큰 Si이나 SnO 2 등의물질에 C나 TiO 2 등을코팅하여 pulverization 현상을방지하고, 충 방전과정에서필연적으로생성되는 solid electrolyte interphase (SEI) layer의지속적인생성을억제하여수명특성을향상시키는연구들도진행되어왔다. 그러나이러한코팅층들이 SEI layer의종류나두께등에가져오는직접적인변화에대한연구는크게주목받지못하였다. 본연구에서는원자층증착법 (ALD) 를이용하여증착한 SnO 2 박막에같은방법으로 TiO 2 코팅을하여코팅두께에따른 TiO 2 -SnO 2 박막음극재의충 방전과정에서생성되는 SEI layer 를관찰하여비교함으로써, TiO 2 코팅이 SEI layer 형성에어떠한영향을끼치는가에대하여분석하였다. 그리고이러한 SEI layer 의두께나구성물질등의변화의원인에대해규명하고, 재료의전기화학적특성에미치는영향에대해분석하고자하였다. P2-G2-11 Nanopore-Embedded Graphitic Carbon Shell on Silicon Anode for High Performance Lithium Ion Battery 실리콘위다공성그래피틱카본코팅을통한리튬이온배터리음극소재적용정철호 *, 홍성현. 서울대학교 Ever growing demand for large-scale energy storage devices needs for high energy density and long cycle life Lithium ion batteries that could not be attained by the currently used battery system. Substituting the anode materials from graphite (370 mah g -1 )to Si (3579 mah g -1 ) has been realized as a promising solution. However, Si goes through a dramatic volume change during cycling and thus undergoes a drastic structural deformation. Among the strategies, Si composites with graphene or its derivatives have been focused to improve the electrochemical performance owing to its outstanding electrical conductivity, mechanical flexibility. The direct growth of graphene or graphitic carbon on Si has been mainly achieved by chemical vapor deposition, which is challenging due to the formation of electrochemically inactive SiC. The conformal graphene coating on Si has been also obtained by wet chemical process, which requires a multiple-step for catalyst coating before carbonization. Recently, metal-containing graphitic carbon has been facilely prepared by transition metal mediated polymerization of dopamine and subsequent carbonization. By utilizing this methodology, a metallic nanoparticle embedded graphitic carbon can be directly grown on Si without precedent metallic graphitization catalyst coating. The embedded metallic nanoparticles can be etched out leaving the nano-pores in the graphitic carbon. Synthesized nanopore-embedded graphitic carbon coated Si is investigated as an anode for LIBs. P2-G2-12 Synthesis and Electrochemical Performances of NaFePO 4 /C Composites as Cathode Materials for Aqueous Sodium- Ion Battery 수계전해질기반소듐이온전지용 NaFePO 4 /C 복합전극합성및전기화학특성평가연구정규남 *, 류명현, 이종원. 한국에너지기술연구원대용량에너지저장시스템 (Energy Storage System, ESS) 은에너지의효율적이용및전력수급해결을위한핵심기술이다. 최근리튬이온전지가 ESS 분야로영역을확대하고있으나, 가격, 리튬자원수급측면에서개선이필요한실정이다. 저가의풍부한소듐자원을활용하는소듐이온전지는 ESS 분야에서리튬이온전지를비롯한기존의이차전지를대체하고 ESS의저가격화를실현할수있는유망기술로, 특히기존유기계전해질의안정성문제를해결하고자수계전해질을적용한소듐이온전지기술개발에대한관심이최근높아지고있는실정이다. 본연구에서는 Olivine 구조의 NaFePO 4 양극소재의충방전안정성을개선시키고자전도성탄소소재를복합화하는연구를수행하였으며, 이를수계전해질기반소듐이온전지에적용하여전기화학특성을평가하였다. 기존 LiFePO 4 소재를전기화학적으로 delithiation/sodiation을수행하 한국세라믹학회 167

188 2017 년한국세라믹학회추계연구발표회 여 NaFePO 4 소재를합성하였고, 다양한양의탄소소재와혼합을통하여 NaFePO 4 /C 복합소재를제조하였다. 충방전평가후전극표면구조를분석하여, 수계전해질하에서의 NaFePO 4 전극의열화반응메커니즘에대하여분석하였으며, 탄소복합양에따른전극표면보호및전기화학특성개선에대한영향성을해석하였다. P2-G2-13 Improving the Interfacial Resistance at the Electrode/ LATP Solid Electrolyte Interface in All-Solid-State Batteries 전고체전지용 LATP 고체전해질및전극계면저항개선연구정규남 *, 신현섭, 이종원. 한국에너지기술연구원상용화된리튬이온전지는유기계기반의액체전해질을사용하고있으나, 유기계전해질의경우폭발 / 화재의위험성이높아전지의안전성을향상시키기위하여유기계액체전해질을무기계기반의고체전해질로대체한전고체이차전지개발필요성이증가되어왔다. 전고체이차전지기술실현을위해서는고이온전도특성을갖는신규고체전해질소재를개발하는연구뿐만아니라, 고체전해질과전극사이의높은계면저항문제를해결하는노력이필요하다. 무기계기반고체전해질중 NASICON 구조의 Li 1+x Al x Ti 2-x (PO 4 ) 3 (LATP) 산화물고체전해질의경우기계적안정성이뛰어나며, 상대적으로우수한이온전도특성 (> , 상온 ) 을나타내어최근많은연구가진행되고있으나, 산화물전극소재와산화물고체전해질간의계면저항이매우커전고체전지의출력및수명특성에큰문제점을야기하는것으로알려져있다. 본연구에서는전극과 LATP 고체전해질사이의계면저항을감소시켜전고체전지의전기화학특성을개선시키기위하여, 고분자전해질및이온성액체를첨가하여전고체전지를제조하였다. 계면분석및임피던스분석을통하여, 고분자및이온성액체가전극 / 고체전해질계면에첨가될경우계면저항에미치는영향성에대하여분석하였으며, 전고체전지충방전평가등을통하여전극 / 전해질계면특성이전고체전지셀열화에미치는영향성에대하여연구하였다. P2-G2-14 Enhanced Photocatalytic Activity of SrtiO 3 Photoanode in TiO 2 Terminated Surface TiO 2 Terminated SrTiO 3 광음극표면에따른광촉매효율연구조태연 *, 이재찬. 성균관대학교 Step edges play a key role in a variety of equilibrium processes, such as thermal roughening and faceting, and influence the kinetics during crystal growth. Consequently, steps at transition metal oxide surfaces have received considerable attention for many years. Here, we focus on step edges on strontium titanate (SrTiO 3 ), which is a candidate of solar water splitting applications. We found that the photochemical marker (i.e., absorbed PbO 2 particle) was mainly located at the step edges of TiO 2 -terminated SrTiO 3 (001) substrate by using atomic force microscopy (AFM). This indicates that photo-oxidation reactions are dominant at the step edges due to its higher surface energy. The Cyclic voltammetry measurement also shows that a photocurrent strongly depends on the mean terrace-width of the SrTiO 3. The enhanced photocurrent was obtained when the smaller terrace-width substrate was utilized. Our results have an implication that surface structures can be applied to photocatalytic water splitting. P2-G2-15 Effect of Non-transition Metal Substitution on Fe and Mn-based Sodium Metal Oxide as Cathode Material for Sodium Ion Batteries 나트륨이온전지양극소재용 Fe 및 Mn 기반나트륨금속산화물에미치는비전이금속도핑의영향왕지은 1*, 정영화 2, 김도경 1. 1 KAIST, 2 포항가속기연구소 The sodium-ion battery (SIB) have attracted much attention as next generation of rechargeable battery which can replace lithium-ion battery (LIB). Compared to LIB, SIB usually have lower energy density but is much more desirable in view point of cost because the sodium source is more abundant and widely distributed. Because the reaction mechanism of SIB is similar to that of LIB, many researchers are focused on layered metal oxides as cathode materials for SIB. One of the traditional approaches to improve electrochemical performance of layered metal oxide cathode materials include substitution of transition metals. Another possible approach is by substituting nontransition metal elements such as Al, Mg, and alkali elements. Nontransition metal elements are electrochemically inactive, so these elements do not contribute to the capacity but they may contribute to structure stability and ionic mobility, improving cycle-life performance and rate capability. In this study, non-transition metal element was doped into Fe and Mn-based sodium metal oxide, which is widely known cathode material for SIB. The electrode material is synthesized by simple solid state synthesis. The structure change of the as-synthesized cathode materials and the effect of substitution on structure change during electrochemical reaction was compared by X-day diffraction analysis and electrochemical tests were conducted to evaluate its performance. P2-G2-16 Synthesis and Characterization of an Intertwined Carbon Nanofiber Web for High-Areal-Capacity Lithium-Sulfur Battery 리튬-황전지의면적당용량향상을위한탄소나노섬유구조체합성과특성평가연구윤종혁 *, 김주형, 김도경. KAIST Lithium-sulfur batteries (LSBs) have been regarded as a bright candidate for next-generation lithium rechargeable batteries. That is because the LSB has a high theoretical specific capacity (1,675 mah g -1 ) and gravimetric energy density (~2,500 Wh kg -1 ). In spite of these virtues, the LSB has been afflicted by the low electrical conductivity of elemental sulfur ( S cm -1 ) thereby the LSB suffers from electrically resistive environment and the inner sulfur undergoes low utilization so-called sulfur activation. Hence, a cooperation of conductive carbon materials are extensively examined to facilitate the electrical conductivity of the LSB systems. A majority of these previous studies, however, were effective to a low amount of sulfur loading (2 mg cm -2 ). Herein, we reports an intertwined carbon nanofiber web as a free standing and binder-free cathode to expedite the electrical conductivity and enhance the loading amount of the sulfur. The cathode realized over 10 mg cm -2 of sulfur loading with a high specific capacity of 752 mah g -1. The reversible capacity retains 90.4% of the initial capacity after 100 cycles, which indicates a little capacity degradation of 0.09% on each cycles. The corresponding areal capacity achieves > 7 mah cm -2 and this result overcomes the areal capacity of the current lithium-ion batteries. P2-S22-1 Perovskite Oxide Electrode for High-performance Reversible Solid Oxide Cells 168 한국세라믹학회

189 포스터발표 II 고성능가역고체산화물전지를위한페롭스카이트산화물전극개발곽민준 1*, 나영흠 2, 김태우 3, 김선동 3, 서두원 3, 최현종 3, 우상국 3, 명재하 3. 1 과학기술연합대학원대학교 (UST), 2 고려대학교, 3 한국에너지기술연구원고체산화물전지의전극은전기전도도, 이온전도도, 촉매능특성을모두만족시켜야하고운전환경인고온, 산 / 환원분위기에서높은물리적 / 화학적안정성또한가져야한다. 기존의고체산화물전지의연료극의경우, 금속과이온전도체를혼합한써멧 (cermet) 을주로사용하고있으나, 낮은비표면적과많은양의금속촉매를사용해야하는한계점을갖고있다. 또한, 고온및산 / 환원분위기에서입자간의응집현상에의한삼상계면의감소와탄화수소연료이용시탄소피독에의해열화가발생되고있다. 본연구에서는기존써멧전극을대체하기위해혼합이온 / 전자전도체 (Mixed Ion-Electron Conductor, MIEC) 에서원하는나노금속촉매를용출법을이용한고성능고내구성의전극을개발하고자하였다. 페로브스카이트구조에서 A-site 의결핍구조와환원방법에따라다양한전이금속나노입자의자가성장 ( 용출 ) 이일어나는현상을분석하였으며, 이를이용하여 700~900 도에서수소및수증기를연료로이용하여전기를만드는반응 ( 연료전지반응 ) 및수소생산반응 ( 전해반응 ) 이하나의시스템에서가능한고체산화물전지에적용하여우수한성능과장기안정성을평가하였다. P2-S22-2 A Study of Catalytic Properties of Iron Oxide-based Composite Catalyst Powders for Carbon Dioxide Reduction 이산화탄소환원을위한산화철계복합촉매분말의특성연구배동현 *. 한국과학기술연구원온실가스의대량배출은지구온난화를야기하였으며기상이변및해수면상승이지속적으로발생되고있다. 대표적인온실가스중하나인이산화탄소는지구온난화현상에 50% 이상의영향을주는것으로알려져있어, 이산화탄소의처리문제는사회환경적문제로대두됨에따라이산화탄소의처리문제를위한해결방안이여러각도에서모색되고있다. 역수성가스전환반응 (Reverse Water Gas Shift reaction; RWGS) 은이산화탄소와수소를이용하여물과일산화탄소를생성하는반응으로, RWGS을고온동시전해반응에접목하면수소와일산화탄소로이루어진합성가스의생산이가능하다. 이를이용하면태양전지및풍력으로생산된신재생에너지의저장이가능하고액화공정을추가하면기존의에너지공급인프라에손쉽게접목가능한 Solar Fuel의시스템구성이가능하다. 하지만 RWGS는열역학적으로 800 o C 이상의고온에서운전하여촉매소재의폭이좁고, 총에너지수지면에서효율이제한적이다. 본연구에서는산화철계촉매소재를기반으로하여이산화탄소환원용복합촉매분말을제조하였다. 촉매반응시 H 2 /CO 2 의반응가스비율, 반응온도, 복합촉매분말의조성등을변화시키고, 반응된가스시료는 GC (gas chromatography) 를이용하여촉매활성도및장기안정성을분석하였다. 그결과귀금속류촉매에준하는이산화탄소환원효율과장기안정성을확인하였다. 산화철계복합촉매는그경제성으로인해고온동시전해뿐만아니라인공광합성분야의환원촉매등으로널리사용될수있을것으로기대된다. P2-S22-3 Synthesis of SrFe 0.8 Ti 0.2 O 3-δ and Electrochemical Test with Electrolyte Support for Symmetric SOFC 양면형 SOFC 전극용 SFTO 합성및전기화학성능실험 곽민준 1*, 김선동 2, 최현종 2, 나영흠 3, 서두원 2, 우상국 2. 1 과학기술연합대학원대학교 (UST), 2 한국에너지기술연구원, 3 고려대학교기존 SOFC 는탄화수소를연료로사용하여연료극에서의탄소증착, 황오염그리고복잡한공정과정으로인한비용증가의문제점이있었다. 이를해결하기위해전해질지지체를기반으로하여산화 / 환원분위기에서안정적인전극을코팅한양면형 SOFC (Symmetric SOFC) 를제작하였다. SSOFC 는하나의전극재료를사용하기때문에한번의열처리로셀을제작가능하며전극과전해질간의호환성문제와가스흐름을역전하여탄소증착과황오염문제를해결할수있는장점이있다. 이번실험에서는 SSOFC 의전극으로산화 / 환원분위기에서안정한 SrFeO 3 (SFO) 에산소분압과넓은온도범위에서더안정한구조를위해서 Ti 가 Fe 에 20% 첨가된 SrFe 0.8 Ti 0.2 O 3-δ (SFTO) 를페치니공법으로합성하였다. 이후 SFTO 의이온전도도향상을위해 YSZ, GDC, LSGM, LSGMZ 를각각반응성실험과성능평가를실시하였다. 그결과반응성이없고가장성능이좋은 LSGMZ 를 SFTO 와 1:1, 1:2, 2:1 의비율로섞어 SFTO-LSGMZ paste 를제작한후전해질지지체에코팅해전기화학성능평가를진행하였다. P2-S22-4 Ceramics Thick Film for Interconnector of Solid Oxide Electrolysis Cell 고체산화물전해셀용세라믹스연결재에관한연구노희석 1*, 친펜 1, 최현종 2, 김선동 2, 우상국 2, 이중건 1. 1 피츠버그대학교, 2 한국에너지기술연구원고체산화물전해셀 (solid oxide electrolysis cell, SOEC) 는물을분해하기위해필요한전기에너지가고온에서더낮아지는현상을이용하여, 고체산화물연료전지 (solid oxide fuel cells, SOFC) 로수소를생산하는방법이다. 적은전기에너지에의한물분해와양방향운전이가능하고전력저장을위한시스템으로적합하다. 연결재는 SOEC의스택제조를위한핵심재료이다. 단위셀을연결하는연결재는산화및환원분위기에접하기때문에화학적으로안정하고, 전기전도성이높은특성, 낮은이온전도성, 다른셀구성품과의열팽창계수일치등이요구된다. 널리사용되는 Fe-Cr 계통의금속재료의연결재는 Cr의기화로인해고온에서셀스택의성능이저하되는단점이있다. 이문제를해결하기위해, 본연구에서는세라믹스로이루어진 SOEC용연결재의제조공정및전기화학적물성에관해서조사하였다. (La,Sr)MnO 3 계세라믹스를선택하여, 분말합성공정변수에따른원료분말의크기와 (La,Sr)MnO 3 소결체의최종미세구조의변화를평가하였다. 재료합성과정을조절하여소결체의입자와밀도를동시에증가시킨결과입계 (grain boundary) 에서일어나는정공 (hole) 산란현상을억제시키고, 고온에서정공의전도도가급격히증가해서세라믹스의전기전도도를증가하는것을관찰하였다. 그리고, 다른 (La,Sr) 계페로브스카이트계세라믹스와비교해서, 미세구조가조절된 (La,Sr)MnO 3 세라믹스가 YSZ 세라믹스와계면반응을억제시켜서 1200도이상에서도 SrZrO 3 등의이차상형성이억제되는것을확인하였다. P2-S22-5 La 0.8 Sr 0.2 FeO 3-δ : Defec t Structure, Electrical Conductivity, Chemical Diffusivity, Thermo-Chemical Expansion, Oxygen Nonstoichiometry La 0.8 Sr 0.2 FeO 3-δ : 결함구조, 전기전도도, 화학확산계수, 열화학팽창, 산소부정비량배호한 *, 임하니, 송선주. 전남대학교 한국세라믹학회 169

190 2017 년한국세라믹학회추계연구발표회 Electrical conductivity, oxygen chemical diffusivity and the chemical expansion of the La 0.8 Sr 0.2 FeO 3-δ used for the application of fuel electrode for solid oxide reversible cells are essentially governed by its defect structure, and its overall defect concentration can be directly measured by oxygen nonstoichiometry. Although it has low total conductivity, recently, because high surface exchange currents comparable to conventional Ni-based cermet at 700 o C and high chemical stability under carbon-containing fuel conditions were reported, LSF82 has been attracted as a plausible candidate for fuel electrode. Because most of the defect chemical research regarding LSF82 have been limited to higher temperature over 1000 o C, thermodynamic quantities and defect equilibrium should be extended to lower temperature. In this work, we report the defect chemistry including spin state of Fe on LSF82, reaction constants with partial molar enthalpy and entropy of reactions, components obtained from Gibbs-Helmholtz equation, and Statistical thermodynamic model. Finally, various equilibrium defect concentrations were successfully calculated as a function of temperature and oxygen partial pressure. P2-S22-6 In situ Activation of A Site Deficient La(Sr) A-x TiO 3 as a Potential Ceramic Anode for Redox Stable SOFCs 고체산화물연료전지용 In situ 활성 A 사이트결핍구조 La(Sr) A-x - TiO 3 기반전극김한빛 *, 신태호. 한국세라믹기술원 A site deficient La(Sr)TiO 3 based oxide has been studied as potential SOFC anode because of its stability in reducing atmosphere, doping flexibility and electronic conductivity. Since La(Sr)TiO 3 based oxide shows poor electro-catalytic activity and ionic conductivity, improvement methods of its catalytic activity and electrochemical conductivity should be strongly requested in harsh condition and even after reduction and re-oxidation. In this study, to overcome these drawback, in-situ activation of A site deficient La(Sr)TiO 3 and exsolved metal nanoparticles such as Ni and Cu were tried in SOFC anode. Well dispersed A site deficient La(Sr)TiO 3 based oxide paste lead to phase separation and smaller microstructure in electrode after heat treatment, and consequentially, smaller microstructure can decrease the temperature for reduction of electrode to SOFC operating temperature. In addition, exsolution of metal particles is happened by reduction in same SOFC operation conditions, moreover, ex-solved metal nano-dot could increase the catalytic activity of electrode. Thus, without any additional process after cell production, improvement of electrode performance was achieved by exposing the SOFC operating condition. P2-S22-7 Fabrication of Nano Scale Bi-layer Using Chemical Solution Deposition and Evaluation of Single Cell Charateristics Chemical Solution Deposition을이용한나노단위이중층제작및단전지특성평가남궁연 *, 홍재운, 임하니, 송선주. 전남대학교고체산화물연료전지 (SOFC) 는전기화학반응을이용해전력을생산하는차세대발전기구중하나이다. SOFC는기존의화석발전에비해친환경적이고연료의공급에따라반영구적인사용이가능하며보다높은효율의에너지변환이가능하다는점에서각 광받고있다. SOFC 의전력생산원리는기본적으로산소산화, 환원반응에기초한다. 이 SOFC 의성능은미세구조의변화, 사용되는물질등다양한요소에따라결정된다. 특히전해질, 전극, 가스가만나는지점인 Triple Phase Boundary(TPB) 의반응자리를늘리는것이분극저항감소에도움이된다. 본연구에서는 Chemical Solution Deposition(CSD) 공정을통해이전해질, 양극사이계면을조절하고자하였다. CSD 는 sol-gel 법중하나로용액또는현탁액을표면위에도포한후입자가침전하여열처리를통해결정화가이루어지는방법이다. 이를통해만든층은기존전해질소결온도보다낮은온도에서치밀한구조를얻을수있다. 또한 grain 의크기가상대적으로작아 grain boundary 의양도많아져전극과전해질사이의계면을조절할수있다. 이와같은결과를토대로계면의미세구조변화에따른단전지성능을 Electrochemical Impedance Spectroscopy(EIS) 를통하여분석하고자하였다. P2-S22-8 Degradation Study of Anode-supported Solid Oxide Fuel Cells Operating under H 2 S Containing Fuel 이호성 *, 이현미, 임형태. 창원대학교 Solid oxide fuel cells (SOFCs) operate under various type of fuel, such as biogas and syngas, due to their high operating temperature (> 700 o C) without the need of pre-reforming. H 2 S poisoning is an important issue for solid oxide fuel cells operated with biogas and syngas. This study investigates various factors, such as H 2 S concentration, operating temperature and water content in fuel gas, affecting degradation of SOFCs. The electrochemical impedance spectra (EIS) of the cells were measured in pure hydrogen fuel and compared to H 2 S additives (before poisoning). The performance degradation was studied with concentration of H 2 S (0~50 ppm) at 700 o C under a constant current (500 ma/cm 2 ) condition. In all cases, the H 2 S contained in the fuel caused a rapid drop in the cell performance (named 1st drop), followed by a slow and steady deterioration (named 2nd drop). In the 2nd drop section, the high concentration of H 2 S accelerated the voltage loss while the voltage drop was not observed at the low H 2 S concentration (5 ppm). For posttest analyses, X-ray Diffraction Spectroscopy (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), and Raman spectroscopy were used. Raman results indicate nickel sulfides were formed in the anode layer, especially at the high H 2 S concentration. Thus, the degradation of SOFCs under H 2 S containing fuel is attributed to the formation of the nickel sulfide at Ni anode. P2-S22-9 MnO-doped Titanium Pyrophosphates (Ti 1-x Mn x P 2 O 7 ; x = 0 0.2) for Intermediate-Temperature Proton-conducting Ceramic-electrolyte Fuel Cells Aman Bhardwaj 1*, Bhupendra Singh 2, 임지원 1, 송선주 1. 1 전남대학교, 2 Indian Institute of Technology MnO-doped TiP 2 O 7 (Ti 1-x Mn x P 2 O 7 ; x = 0-0.2) were synthesized by digesting oxide precursors with H 3 PO 4 in a two-step synthesis method. Various compositions of Ti 1-x Mn x P 2 O 7 were characterized by X-ray diffraction (XRD), thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). XRD of 1050 C sintered samples showed the formation of (TiO)P 2 O 7 in 한국세라믹학회

191 포스터발표 II mol% MnO-doped samples. SEM images of 1050 C sintered Ti 1-x Mn x P 2 O 7 samples showed that MnO acts as a sintering aid, with the higher amount of MnO leading to a better densification. It was observed that the ionic conductivities of MnO-doped sintered samples were higher than that of un-doped TiP 2 O 7 (TiP) sample. The increase in ionic conductivity of MnO-doped TiP2O7 can be attributed to MnO acting as an acceptor dopant, and increased densification of the MnOdoped samples. In un-humidified air, among various MnO-doped samples, Ti 0.9 Mn 0.1 P 2 O 7 (TMP10) showed the highest ionic conductivity with a magnitude of S cm 1 at 250 C and Scm -1 at 500 C. Furthermore, the ionic conductivity of TMP10 was higher than that of Ti 0.88 Mn 0.12 P 2 O 7 (TMP12), which could be attributed to the formation of defect pairs in TMP12. In addition, comparison with the literature data showed that the ionic conductivity of TMP10 was higher than those observed for the high-temperature sintered TiP 2 O 7 samples. P2-S22-10 Phase Synthesis, Microstructural and Electrochemical Properties of Nd and Sm Substituted into Layered Perovskites as Cathode Materials for Intermediate-temperature Solid Oxide Fuel Cells 중 저온형고체산화물연료전지의공기극으로사용되는 Nd과 Sm이치환된 layered perovskite 산화물의상합성, 미세구조및전기화학특성김정현 *, 송선웅. 한밭대학교고체산화물연료전지는고온영역에서운전될경우공기극의크롬피독현상, 스택의밀봉, 분리판금속의산화와같은문제가발생된다. 이러한문제를해결하기위하여 500~700 o C의중 저온온도구간에서운전하기위한연구가활발히진행되고있다. 특히중 저온의온도범위에서공기극의분극저항증가에따른성능감소가전체분극저항의 50% 이상을상회하기때문에새로운공기극물질에대한연구가필수적이다. 최근본연구그룹은 SmBa 0.5 Sr Co 2 O 5+δ layered perovskite 산화물을합성하여우수한전기화학특성을확인하였다. 본연구에서는 AA B 2 O 5+δ 구조의 SmBa 0.5 Sr Co 2 O 5+δ layered perovskite 산화물을기반으로 Samarium과 Neodymium을단계적으로치환한 (Sm 1-x Nd x ) Ba 0.5 Sr 0.5 Co 2 O 5+δ layered perovksite 산화물의상합성, 미세구조특성및전기화학특성을분석하였다. P2-S22-11 Synthesis and Electrochemical Properties of Nonstoichiometric Layered Perovskite Oxides as Cathode Materials for Intermediate-temperature Solid Oxide Fuel Cells 중 저온고체산화물연료전지공기극으로적용하기위한비화학양론조성의 Layered Perovskite 산화물의합성및전기화학특성김정현 *, 우성훈, 송선웅. 한밭대학교고온영역에서운전되는고체산화물연료전지 (Solid Oxide Fuel Cell) 는세라믹전극의활성화에의해높은전력밀도를보이는장점이있으나금속재료의내구성및산화작용에따른다양한문제를가지고있다. 최근에는국내외의많은연구기관에서는실용적인측면과상용화에유리한중저온형고체산화물연료전지 (Intermediate Temperature-operating Solid Oxide Fuel Cell, IT- SOFC) 연구에많은노력이진행되고있다. 본연구에서는 Layered Perovskite인 SmBa 0.5 Sr 0.5 Co 2 O 5+δ (SBSCO) 의 A-site를비화학양론조성으로합성하여결정구조특성을분석하였으며온도에따른전기전도도및면적비저항특성을분석하였다. P2-S22-12 The Effects of the Calcination Temperature of the Composite Electrode on the Fuel Cells and Co-electrolysis Performance 복합체전극의상합성온도에따른연료전지및동시전해성능변화신민호 *, 박종성, Anggia Erdienzy, 이한진, 신은경, 김재율. 명지대학교공기중포집한이산화탄소를이용하여메탄과같은탄화수소연료로전환하기위해서는이산화탄소를일산화탄소로분해하여야하며, 방법중하나로는고체산화물연료전지의전해전지를사용하는방법이있다. 또한, 이산화탄소만이아닌수증기를포함한이산화탄소를동시전기분해함으로써, 탄화수소연료합성에필요한 syngas를제조할수있으며, 이를동시전해 (co-electrolysis) 라하며, 최근전지구적인환경문제및에너지고갈문제를동시에해결할수있는기술로활발히연구가이뤄지고있다. 기존의 Ni-YSZ Cermet은고체산화물연료전지의음극물질로많이사용되고있다. 이러한 Cermet류의전극들은장기간안정성과산화-환원안정성이좋지못하다. 따라서 Cermet과같이이온전도도및전기전도도를같이갖는산화물복합체전극의개발이필요하다. 본연구에서는 (La,Sr)(Cr,Mn)O 3 (LSCM)-YSZ 산화물복합체전극의상합성온도에따른결과를고찰하였다. 복합체전극을만들기위해 68%~72% 기공율을가지는 YSZ지지체에 50 wt% 의 La 0.8 Sr 0.2 Cr 0.5 Mn 0.5 (LSCM) 을함침법을통하여만들었다. LSCM 전극물질은 YSZ와반응하지않으며페로브스카이트계물질이다. 우리는 LSCM의상합성온도에따라전지의연료전지 (fuel cell), 동시전해전지 (Co-electrolysis cell) 성능을측정하였으며, 상합성온도에따라성능의차이가나타남을확인하였다. 산화물복합체의순수한성능만을비교하기위해촉매는사용하지않았으며, 기존에보고된 LSCM의상합성온도 1200 o C 보다낮은온도에서측정을실시하였고, XRD 분석과미세구조관찰을통하여상합성의유무와각각의상합성온도에따른차이를확인하였다 P2-S31-1 Preparaion and Characterizations of Silicon Carbidebased Ceramic, Embranes 탄화규소기반세라믹분리막의제조및특성평가이수진 *, 하장훈, 자이검아바스, 이종만, 송인혁. 재료연구소현재까지수처리분야에서사용되어온고분자분리막은운용온도의제한과낮은강도및화학적안정성등의문제를가지고있어그적용범위가한정적일수밖에없다. 반면, 세라믹분리막은고온유입수에대응이가능하며, 화학적안정성이뛰어나혹독한환경에서도특유의장점을이용하여적용될수있으며, 분리막의교체주기도감소시킬수있어분리막소재로주목받고있다. 세라믹소재중탄화규소는열적, 화학적안정성이우수하나강한공유결합을이루고있어 2000 o C 이상에서소결이가능한난소결성물질이다. 이러한문제점을극복하기위하여고령토를소결조제로첨가함으로써점성을지닌입계상을형성하여 1400 o C에서소결이가능하도록하여경제적인문제를극복할수있도록하였다. 정밀여과를위하여알루미나코팅공정을도입하여평균기공크기를 0.11 μm까지감소시켜박테리아, 에멀전크기의부유물을걸러낼수있도록하였다. 또한, 알루미나다층코팅공정을통해알루미나코팅층의두께에따른분리막의특성을측정하였다. 알루미나코팅을 1회 ( 코팅두께 : 10 μm) 실시했을때수투과율은약 m -2 h -1 bar -1 정도였으며, 3회 ( 코팅두께 : 40 μm) 실시했을때약 m -2 h -1 bar -1 정도로측정되었다. 이를통해코팅층의횟수가늘어남에따라코팅층의두께가두꺼워졌으나, 수투과율은크게떨어지지않는것을확인할수있었다. 그리고분리막의 한국세라믹학회 171

192 2017 년한국세라믹학회추계연구발표회 성능을좌우할수있는파울링을최소화하기위해알루미나슬러리를볼밀함으로써표면평탄도를개선하였다. P2-S31-2 Preperation and Characterization of a Carbon-coated Reticulated Porous Alumina Material 탄소코팅다공성알루미나폼의제조및특성평가이수진 1*, 하장훈 1, 최재령 1, 이종만 1, 송인혁 1, 정태주 2. 1 재료연구소, 2 안동대학교최근, 전자및통신기기의수요확산과군사용도로응용분야가다양한전파흡수소재에대한관심이확대되고있다. 군사용도의응용중레이더전파흡수소재로기존에사용되어온고분자재료는고온환경에서열변형이발생하고, 이로인한물성저하가발생하게된다. 이러한문제점을해결하기위해고온환경에적용가능한세라믹전파흡수소재개발의필요성이대두되고있다. 3차원네트워크구조를갖는개기공다공체세라믹은 70-95% 의높은기공률을갖는다. 본연구에서는폴리우레탄스펀지를알루미나슬러리에함침하여열분해를통해다공성알루미나폼을제조하였으며, 전파흡수기능을갖게하기위해다공성알루미나폼에탄소를코팅하여내열개기공알루미나전파흡수소재를개발하였다. X밴드 (8.2 GHz~12.4 GHz) 에서의전파흡수특성측정결과탄소의양이 10 wt.% 일때, 8.2 GHz에서 db(90% 흡수 ) 의값을갖는전파흡수소재를제조하였다. 또한, 세라믹폼의높은기공률특성상강도가낮으므로폴리우레탄의기공밀도와소결온도의조절을통하여다공성알루미나폼의강도를증진시킬수있도록하였다. 이를통해폴리우레탄의기공밀도가 45 ppi (pores per inch) 이며소결온도는 1600 o C일때, 가장높은 8.89 MPa의압축강도값을갖는다공성알루미나폼을제조하였다. P2-S31-3 Fabrication and Application of Porous Titania Particles for Water Purification 다공질타이타니아분말의합성및수처리용광촉매응용기술조영상 *. 한국산업기술대학교광촉매효과가발견된이후로, 타이타니아나노입자의합성및환경정화용광촉매응용을위한연구는광범위하게행해져왔다. 현재다양한루트를통해상용화된타이타니아나노입자의구매가저렴한가격으로가능한수준으로범용기술로자리잡고있다. 환경정화용소재외에도선크림등자외선차단을위한소재로도타이타니아나노입자가활용되고있으며, 그응용범위는점차확장되는추세이다. 하지만최근결정상을갖는나노입자의생체독성이이슈로부각되고있으므로, 기존에타이타니아나노입자가활용되던적용분야에서제한적인활용만가능할수있는상황이대두되고있다. 이러한관점에서기존에광촉매로활용되던타이타니아나노입자를대체할수있는신규소재의개발이요구되며, 기존과성능면에서차별화된기술의연구가필요하다. 본학술발표에서는콜로이드자기조립기술에의해다공질타이타니아분말소재를합성하고, 이를광촉매로응용하는연구결과를소개하고자한다. 다공질타이타니아분말의기공크기제어, 입도제어등을통해수처리용광촉매로써의성능에미치는영향을연구하였다. 모델오염물질로써로다민 B, 메틸렌블루등의유기물을분해하여대부분을제거할수있는고효율광촉매기능성을구현하였으며, 슬러리형태의광촉매반응기에적용한뒤, 자연침전에의해마이크로미터크기를갖는다공질광촉매분말을정화수로부터자연스럽게분리할수있음을설명하고자한다. 감사 : 본연구는한국연구재단신진연구자지원사업의연구비지원 (NRF-2017R1C1B ) 에의해수행되었으며, 이에감사드립니다. P2-S31-4 Fabrication and Applications of Porous Ceramic Fibers by Electrospinning Method 전기방사에의한다공질세라믹미세섬유의합성및응용기술조영상 *. 한국산업기술대학교본학술발표에서는전기방사기술에의해세라믹재질의다공질섬유를합성하고이를광촉매또는흡음재등에응용하는연구결과에대하여소개하고자한다. 미세섬유의제조를위하여기존의방사기술이활용가능하지만, 실험실수준에서손쉽게적용할수있는전기방사기술은필터등의고전적인응용분야를포함하여흡착재, 촉매담체, 전극소재, 세포배양지지체등광범위하게활용되고있다. 이는방사용액의성분조절을통하여다양한소재의미세섬유를제조할수있으며, 방사조건을제어하여미세섬유의크기를조절할수있는용이성에기인한다. 전기방사로형성된미세섬유는섬유사이의공간이비어있으므로, 그자체가다공성을지닌다. 본연구에서는추가적인다공성을부여하기위하여섬유내부에주형물질을주입시키고, 고온소성에의해이를제거하여다공질미세섬유를합성하고이를응용하는연구결과에대하여소개하고자한다. 본연구에서는콜로이드주형법에의하여다공질미세섬유를전기방사기술에의하여합성하였다. 방사용액에는고분자라텍스입자및세라믹전구체를포함시켰으며, 전기방사공정후에고온소성을거쳐다공질세라믹미세섬유를제조할수있었다. 미세섬유의기공크기는주형물질의입도를조절하여제어할수있었으며, 세라믹재질은액상전구체의종류를변화시켜실리카, 타이타니아등의금속산화물의구현이가능하였다. 본연구에서는이를응용하기위하여다공질타이타니아섬유는수처리용광촉매로응용할수있었으며, 다공질실리카미세섬유는고내열성흡음소재로응용하였다. 본연구는국토교통부국토교통기술촉진사업의연구비지원 (17CTAP-C ) 에의해수행되었습니다. P2-S31-5 Effect of Al 2 O 3 content on Flexural Strength of Pyrophyllite Mineral-Based Ceramic Membrane 납석광물기반세라믹분리막의곡강도에대한알루미나함량의영향김명중 *, 최광일. ( 주 ) 아이비머티리얼즈지구환경문제로인하여물부족에대한관심이지속적으로증가하면서물을재순환하여사용하기위해분리막 (Membrane) 기술이적용되고있는데그중에서도화학적으로안정하여내구성이뛰어나고높은통기성을갖는세라믹분리막에대한관심이증가하고있다. 이러한세라믹분리막은대부분세라믹지지체를기반한다층의막구조로이루어져있는데소재의양적인측면에서세라믹막에비해세라믹지지체가차지하는비중이매우큰데대부분고가의알루미나원료를사용하고있어경제성이떨어진다. 따라서이지지체를경제적으로제조하기위해국내다량으로부존하는알루미노-실리케이트점토광물인납석 (pyrophyllite) 을이용하여알루미나원료를대체함으로써경제성있는세라믹분리막지지체를개발하고자하였다. 이를위해납석을최대한사용하고자알루미나의함량을조절하여세라믹압출성형법으로제품을제작하였고 UTM을이용하여 3점곡강도를측정하였고 Porosimeter를이용하여기공특성을파악하여그영향을확인하였다. 172 한국세라믹학회

193 포스터발표 II P2-S31-6 Fabrication and Characterization of Porous Foaming Ceramics Using Waste Coffee 폐커피를이용한다공성발포세라믹제조및분석이주현 1*, 곽민석 2, 양현경 2, 김해주 2. 1 맥한신소재, 2 부경대학교 Currently, the cost of recycling waste coffee powder is increasing in the market. A more efficient way to recycle waste coffee powder is needed. We focused that the waste coffee powder can be applied to new format through the production of foaming ceramics using such waste coffee grounds. By using the waste coffee powder as foaming agent, a foaming ceramic are fabricated to applied in the construction materials. Compression strength of foaming ceramic using waste coffee was 2.31 MPa, and the far-infrared emissivity and emission power of foaming ceramics were confirmed and W/(m 2 μm), respectively. The deodorization rate of NH 3 and H 2 S of foaming ceramics using waste coffee were 83.7% and 99.8%, respectively. Compared with a standard of the emission of environmentally hazardous substances, the foaming ceramic using waste coffee was satisfied the standard. As a result, we confirmed that the foaming ceramic using waste coffee had various functionalities, and it could be applied in various fields. P2-S31-7 Properties of Alumina-Coated Silicon Carbide Membranes for Wastewater Treatment 알루미나가코팅된수처리용탄화규소분리막의특성김현민 1*, 김수창 1, 염희종 1, 김영욱 1, 송인혁 2. 1 서울시립대학교, 2 재료연구소 Crack-free γ-al 2 O 3 -coated SiC membranes were successfully prepared using a simple heat-treatment and dip-coating process at a temperature as low as 850ºC in air. The changes in the porosity, flexural strength, flux, and oil rejection rate of the membranes were investigated while changing the initial SiC particle size. Larger SiC particles led to bigger pores, resulting in higher flux in the oily water and a lower oil rejection rate. The SiC membranes with a support prepared from 10 μm SiC powder showed an exceptionally high oil rejection rate (99.9%) with a feed oil concentration of 600 mg/l at an applied pressure of 101 kpa. Typical flexural strength, porosity, steady state flux, and permeability of the Al 2 O 3 -coated glass-bonded SiC membrane were 80 MPa, 45%, m 3 m -2 s -1 at an applied pressure of 101 kpa, and m 3 m -2 s -1 kpa -1, respectively. P2-S31-8 Porous Calcium Phosphate (CaP) Scaffolds using 3D Printing System; Rapid Direct Deposition with CaP Paste 자유형상제조기술 (3D Printing) 기술기반의다공성 3차원고기능성생체세라믹지지체공정기술조인환 *, 맹우열, 최재원, 김민훈, 고영학. 고려대학교 We herein propose a novel way for manufacturing highly porous biphasic calcium phosphate (BCP) scaffolds with tubular structure with proper mechanical properties using rapid direct deposition of dual phase initial feed rod, which are consisted of a carbon black paste core with ceramic paste as a shell. This novel technique make full use of inherent propriety of methylcellulose (MC) polymer used as the binder in aqueous system for fabricating stable initial feed rod. This allowed samples with dual pore structure both 3-dementionally fully interconnect pore and interconnected tubular BCP channel. In this study, to accomplish the goal, one of the advanced and promising technique named RDD-Robot ; rapid direct deposition robot system is applied to fabricating 3-D porous bio-ceramic scaffold and controlling their pore structure specifically the porosity with a BCP as a starting materials, which is well known as a one of the most biocompatible bio-ceramic. The 3-D porous BCP scaffolds are deposited in acetone bath by using air pressed 3-D RDD robot with a syringe and 20-gauge nozzle tip. In the syringe, BCP-MC (methyl cellulose) paste which are comprised of 60 wt% of BCP and 5 wt% of MC(methyl cellulose) in relation to distilled water, are packed. The characteristics of sintered 3-D porous BCP scaffolds were closely observed by SEM (scanning electron microscopy) and their mechanical property in terms of compressive strength is examined. P2-S31-9 Study on Gas Permeability and Pore Structure of Porous Alumina-Based Ceramics 김재 1*, 하장훈 2, 이종만 2, 송인혁 2. 1 과학기술연합대학원대학교 (UST), 2 재료연구소 Darcy s law is widely applied in literature and industries to understand fluid flow in porous materials. Because it has simplicity that we consider only the viscous effect on the fluid pressure drop and establishes a linear dependence between the pressure gradient and the fluid velocity through the porous medium. However, Forchheimer s equation which establishes a more realistic dependence between fluid pressure and fluid velocity, has been used to obtain the permeability constants k 1 and k 2. Therefore, in this study, comparison of porous alumina-based ceramics fabricated from different starting powder size aims to find suitable equation to analyse porous material which have complexity of pore structure. For analysing gas flow, Forchheimer number which is useful instead of Reynolds number was required to be used to determine main pressure regime which one is viscous effect or inertial effect by fluid velocity and pressure gradient in porous alumina-based ceramics. P2-S31-10 Effects of Carbon Source Compositions on the Properties of Porous SiC Body Fabricated by a Direct Reaction between Carbon and Silicon 카본출발원료가규소와카본의직접반응으로제조된탄화규소의다공체의특성에미치는영향염미래 1*, 윤성일 2, 박상환 3, 최성철 1. 1 한양대학교, 2 고려대학교, 3 한국과학기술연구원세라믹다공체는집집필터, 촉매및촉매담지체, 흡착체, 단열재료, 여과재료, 전극재료및인공생체재료, 경량구조재료와같이다양한산업분야에서사용되고있으며, 그중탄화규소다공체는탄화규소의우수한열기계적및내화학적특성으로가혹한환경조건에서도사용이가능하기때문에최근화학, 환경및에너지산업분야에서핵심소재로주목을받고있다. 본연구에서는실리콘과카본의직접반응을이용해메조-마이크로의기공크기를갖고기계적특성이우수한탄화규소다공체를제조하였으며, 출발카본원료가탄화규소다공체의기공특성및물리적특성에미치는영향에관하여연구하였다. 출발원료인카본 /CNT가혼합된원료와실리콘의몰비1.0~2.5로변화시켜에탄올을이용하여습식볼밀링으로혼합한후, evaporator로건조해혼합분말을제조하였다. 사용된 CNT의양은전체카본의 0~30 wt% 를사용하였으며, 제조된 한국세라믹학회 173

194 2017 년한국세라믹학회추계연구발표회 혼합분말은 < 45 um 이하의분말을분급하여사용하였다. 일축가압법으로제조된성형체는 Ar 분위기하에서 1250 o C, 10 시간열처리하여잔류규소가없는탄화규소다공체를제조하였다. 출발원료인카본의몰비가증가함에따라제조된탄화규소다공체의압축강도는 30 MPa 에서 5 MPa 로감소하였으며, 기공률은 65% 에서 75% 로다소증가하는것으로나타났다. 또한카본원료내 CNT 의양이증가함에따라제조된탄화규소다공체의기공률은증가하였고, 압축강도는감소하는것으로나타났다. 제조된탄화규소다공체의비표면적은 50 m 2 /g 로크게차이가나지않았다. P2-S31-11 The Effects of SiC Powder on the Mechanical Properties of Liquid Phase Sintered Porous SiC with Al 2 O 3 -Y 2 O 3 - SiO 2 미세탄화규소분말첨가가 Al 2 O 3 -Y 2 O 3 -SiO 2 계액상소결탄화규소다공체의기공및기계적특성에미치는영향윤성일 1*, 박상환 1, 남산 2, 염미래 3. 1 한국과학기술연구원, 2 고려대학교, 3 한양대학교탄화규소 (SiC) 는비산화물계세라믹으로서기계적강도, 화학적안정성및열충격특성이우수하여구조세라믹스재료로서널리사용되어왔으며, 이러한우수한기계적특성을갖는탄화규소다공체는디스플레이공정용진공척, 세라믹멤브레인, 고온분진필터등다양한분야에서이용되고있다. 본연구에서탄화규소다공체를소결하기위하여알루미나, 이트리아및실리카분말을소결조제로사용하였다. 소결조제간의균질한혼합을위화여알루미나, 이트리아및실리카분말을미분탄화규소분말과함께알루미나볼을사용하여에탄올용매에서 24시간동안볼밀링하였다. 건조된소결조제 / 미립탄화규소혼합분말과 63 um 크기의과립탄화규소분말을탄화규소볼을사용하여건식으로 6시간동안혼합한후혼합분말무게대비 8% 의 PVA(1 wt.% sol) 용액을첨가하여 40 MPa의압력으로일축가압성형하였다. 탄화규소다공체는 Ar 분위기에서 10 o C/min의속도로 1500 o C까지승온한후 1시간유지시켜제조되었다. 소결조제의함량이 20 vol.% 인탄화규소다공체의굽힘강도는미립의탄화규소분말함량이 0~30% 로증가함에따라 47.2 MPa에서 27.7 Mpa로감소하였으나기공율은 40% 에서 38.9% 로큰변화가없었다. P2-S31-12 Impact of Al 2 O 3 -TiO 2 /ZrO 2 -SiO 2 Colloidal Suspension Properties to Porous Ceramics Al 2 O 3 -TiO 2 /ZrO 2 -SiO 2 가다공성세라믹스제조를위한콜로이드현탁액의물성에주는영향김익진 *, Bijay Basnet, 장우영, 박중규. 한서대학교 Aluminium titanate (Al 2 TiO 5 ) based porous ceramics were synthesized by a direct foaming method using α-al 2 O 3, TiO 2, ZrO 2, andsio 2 as starting materials. This study reports on the impact that the rheological and colloidal properties to the wet-foam stability of porous ceramics obtained from a particle-stabilized colloidal suspension via direct foaming. The partial hydrophobization of the colloidal suspension was carried out by applying propyl gallate (PG) as a surfactant. The effect that rational composition had on the wet foam stability in terms of the rheology, surface tension, average bubble size and air content are discussed in this paper. The results show a wetfoam stability of more than 87% which corresponds to an air content of 85% with a colloidalsuspension of 1:1 ratio. The addition of ZrO 2, - SiO 2, suspension decreases the viscosity of the colloidal suspension to a create a favourable condition for wet foam stability. The uniform distribution of highly open/interconnected pores was controlled with an increase in the ratio of ZrO 2, - SiO 2 of up to 20 wt.% and thick struts, leading to a higher wet foam stability for porous ceramics. P2-S32-1 Joining of SiC Monoliths Using a Thin Ti 3 AlC 2 Tape and the Elimination of Joining Layer by Solid-state Diffusion Ti 3 AlC 2 막테잎을이용한 SiC 단미체결합과고체확산에의한접합층제거 Pipit *, Amit Siddharth Sharma, 정동혁, Arifin Septiadi, 윤당혁. Yeungnam University We report the feasibility study on the joining of SiC monoliths using a thin Ti 3 AlC 2 tape and subsequent elimination of joining layer via solid-state diffusion. The base SiC monolith was fabricated by simple hot pressing of SiC particles after adding 5 wt.% Al 2 O 3 -Y 2 O 3 sintering additive. A butt-joint configuration was prepared and joined by hotpressing under 3.5 MPa applied pressure after inserting a thin Ti 3 AlC 2 tape. Experimental parameters, including joining temperature (1700 and 1900 o C), holding time (5 and 8 h) and interlayer thickness (10 and 60 µm), were varied to obtain a sound mechanical joint. The integrity of the joints was examined by microstructural observation in terms of elemental distribution, phase distribution, the evolution of pores and cracks, and mechanical testing. Especially, the joining interface was indistinguishable, while maintaining a good mechanical bonding between two neighboring base material without presence of joining interlayer, for the SiC monolith joined at 1900 o C. The fracturing during the mechanical test occurred from the joining body rather than the joining interface, indicating the optimum quality of the joint with the strength of 290 MPa. These findings highlighted the elimination of joining interlayer, which might be an ideal joining for practical applications because the absence of joining region led to the preservation of mechanical properties of the SiC base materials. P2-S32-2 Analysis of Crack Density by Thermal Shock in Environmental Barrier Coatings 내환경코팅층의열충격에의한균열밀도분석서형일 1*, 이기성 1, 박지연 2. 1 국민대학교, 2 한국원자력연구원가스터빈의에너지효율증대를위하여고온에서작동하는가스터빈의개발이이루어지고있다. SiC는고온에서의우수한열내구성과, 고경도를가지는특성으로가스터빈에사용될유망한후보재료이다. 고온에서의가스터빈의작동에는산화반응과, 터빈의기동 -정지간의발생하는열충격이발생할수있기에이에대한내구성연구평가가필요하다. 또한고온에서수증기와산소의접촉으로인한산화반응과반응생성물에의해발생하는 SiC의질량감소는제품의수명과작동에영향을줄수있다. 따라서본연구에서는 SiC의고온에서의환경차단을위한, 코팅층의열충격에대한특성을평가하였다. Mullite, Yb 2 SiO 5, Y 2 SiO 5 를 EBC 코팅층소재로선정하여 SiC에플라즈마용사법으로코팅한시편을가공한후, 고온에서부터열충격시험을하였다. 열충격시험후, 광학현미경을통한미세균열의분석을통해균열밀도를분석하였다. P2-S32-3 A Study on the Tensile Properties of Tubular-type Ceramic Matrix Composites Using Hoop Tensile Test fixture Hoop tensile 시험치구를이용한 tube형섬유강화세라믹복합소재의인장특성연구 174 한국세라믹학회

195 포스터발표 II 이슬희 1*, 김수현 2, 김세영 2, 한인섭 2, 송종섭 3, 최헌진 1. 1 연세대학교, 2 한국에너지기술연구원, 3 충남대학교 C/SiC ( 탄소섬유강화세라믹복합소재 ) 는내열 내환경특성이매우뛰어나항공우주부품및고온환경부품에적용되고있다. 본연구에서는 Filament winding method 로제조된 tube 형 C/SiC 복합소재의 Hoop tensile strength 를평가하고자하였고, Hoop tensile strength 에영향을줄수있는치구의직경, 치구사이간격등의변수를변화시켜최적의시험조건을도출하기위한연구를진행하였다. 이를위해동일방법으로제작된평판시편과특성비교인장시험또한동시에수행하였다. Tube 형시편은평판시편에비해인장시험시굽힘응력이발생하며이로인한내축과외축의변형률의상이로응력상태가다르게나타난다. 이를최소화하기위해치구조건을변화시켜인장시험을수행하였다. 결과적으로, 내축과외축모두의동일한인장하중인가가불가능하여평판시편과비교시강도결과값은낮게나타났지만강성결과값은매우유사함을알수있었다. 따라서, Hoop tensile test 는 tube 형 CMC(Ceramic matrix composites) 부품의강성평가에적합한방법으로판단되었다. P2-S32-4 Study on the Oxidation Resistance of EBC Coated SiC by Arc Ion Plating 내환경코팅재가적용된 SiC 소재의제조및산화특성평가박정환 *, 정양일, 박동준, 최병권, 김현길, 김원주. 한국원자력연구원 SiC 는내열성, 내충격성, 높은열전도도등고온에적용가능한열적특성과고강도, 내마모성등의우수한기계적특성을가지고있기때문에에너지산업및항공우주산업용고온부품소재로연구되고있다. 최근에는우수한내방사성을가지는 SiC를원자력분야에적용하여상용원자로의안전을향상시키는사고저항성강화피복관, 차세대원자로의하나인초고온가스로노심부품등으로사용하기위한연구가활발히진행되고있다. 그러나 SiC 는고온에서산화가일어나고, 특히원자로가동조건및사고조건에서수증기와반응하여침식에의한부식이일어나는것으로보고되고있다. 또한 SiC 복합체의경우 SiC 섬유와기지상사이에존재하는열분해탄소와같은계면상이고온환경에서산화에의해기계적특성을감소시켜원자로안전을저해하기때문에 SiC 부식방지에대한중요성이커지고있다. 그러므로 SiC 부식을방지하기위해수증기와 SiC의접촉을차단하는내환경코팅 (EBC, Environmental Barrier Coating) 에대한연구가활발히진행되고있다. 최근에는 CVD, Sol-gel, PVD 등다양한코팅법을이용하여 SiC 표면에내산화막을코팅하는연구가활발히진행되고있다. 특히 PVD 방법중아크이온플레이팅 (AIP, Arc Ion Plating) 은높은이온화율과함께모재와의높은밀착력등많은장점을가지고있기때문에내산화막코팅법으로주목을받고있다. 이에본연구에서는고온내산화성이우수하다고알려진 Cr 계합금재료를아크이온플레이팅코팅법을사용하여 SiC 표면에코팅하였다. 뿐만아니라원자로정상운전조건및사고조건에서 Cr 합금이코팅된 SiC 의부식특성을분석함으로써원자력분야에대한 SiC 소재적용가능성을평가하였다. P2-S32-5 Effect of Carbon Fiber Surface Treatment on Thermal and Mechanical Properties of C/SIC Composites 탄소섬유표면처리공정을통한 C/SIC 복합소재의열적, 기계적특성변화연구송종섭 1*, 김세영 2, 김수현 2, 성영훈 2, 백경호 1. 1 충남대학교, 2 한국에너지기술연구원 열전도도가우수할경우과열로인한열손상을줄일수있을뿐만아니라적정온도유지에용이하여냉각시스템에적합하다. LSI 공정으로제조된 C/SiC 복합소재는고온에서의안정성, 산화저항성, 높은열충격저항성등의특징을갖고있어극한환경에서사용할수있지만, 열전도도특성은금속에비해상대적으로낮다. 본연구에서는, 고온환경에서사용되는 C/SiC 복합소재의냉각시스템효율을향상시키기위해질산을사용하여표면처리시간에변화를준탄소섬유를이용하여 segment 균열비율을증가시킨 C/SiC 복합소재를제작한후열적, 기계적성질을분석했다. 섬유표면처리시간증가와함께복합소재의열전도도는증가하였지만, 3 점굽힘강도는 60 분처리까지소폭감소한후, 급격히감소했다. 이는 segment 균열의증가에따른 SiC 매트릭스, free silicon 의증가되는현상과, 질산처리에따른섬유손상으로인한강도저하가원인이라고판단된다. P2-S32-6 Hoop Strength Test using Internal Pressure of Multilayered SiC Composite Tube 다중층 SiC 복합체튜브의내부압력을이용한후프강도평가연구이현근 *, 김대종, 박지연, 김원주. 한국원자력연구원다중층 SiC 복합체튜브는원자력발전소의핵연료피복관의안정성을향상시키기위한사고저항성핵연료로제안되고있으며, 시스템원자로의냉각재상실중대사고시냉각재와의반응에의한수소발생량이매우낮아현재경수로의지르코늄합금피복관을대체할수있는주요후보중하나이다. 원자로의핵연료피복관으로적용되기위해서는핵분열생성물에의해발생하는내부압력으로부터파손되지않고기계적강도및가스기밀성을유지할수있어야한다. 핵분열생성물에의한내부압력은피복관에원자방향의후프응력을야기시키며, 일반적으로피복관튜브형상재료의후프강도는튜브내에폴리우레탄플러그를삽입하고압축시켜튜브에원주방향의응력을주어파괴시키는방법으로측정하였다. 그러나상기방법에서는후프응력이내부압력으로유도된인장응력에비해플러그의전단특성및마찰등의특성으로인해튜브전체에균일하게분포되지않으며그양상이다르게유도될수있다. 따라서본연구에서는 SiC 복합체튜브의후프강도를측정하기위해오일압축을이용하여튜브전체에균일하게내부압력을가하는장치를개발하였으며, 단미 SiC층과 SiC 복합체로이루어진삼중층및이중층 SiC 복합체튜브의후프강도를측정하였다. 내부압력에의해야기된후프응력으로인해파괴된다중층 SiC 복합체튜브의미세구조를분석하였다. 기존연구에서수행된플러그를이용한후프강도값과비교하기위하여유효면적 (Effective surface) 개념을적용하였다. 내부압력으로측정한다중층 SiC 복합체튜브의후프강도값을후프응력이유도되는유효면적과폴리우레탄플러그후프강도평가방법을전산모사로분석한결과를종합하여분석하였다. P2-S32-7 Effect of Annealing on Crystallization and Mechanical Properties of Amorphous SiC Coated by Chemical Vapor Deposition 화학기상증착방법으로코팅된비정질 SiC에열처리가기계적성질과결정성에미치는영향이승호 *, 김대종, 이현근, 박지연, 김원주. 한국원자력연구원화학기상증착법에의해제조된 SiC는고온에서의우수한기계적특성과산화저항성을가질뿐아니라중성자조사에의한기계적강도저하및부피변화가거의없다. 현재가압형경수로의핵연료피복관으로지르코늄합금이사용되고있으나, 사고발생시고 한국세라믹학회 175

196 2017 년한국세라믹학회추계연구발표회 온에서의지르코늄합금과냉각재의산화반응에의해발행하는수소로인해폭발위험성이아주크다. 이러한단점을보완하기위해고온특성이우수한 SiC f /SiC 복합체가핵연료피복관의대체재료로고려되고있다. 하지만, 결정성이떨어지는 SiC 의경우에는기계적특성을비롯한물성저하가우려되기때문에열처리등을통하여결정성을향상시키려는노력들이있다. 본실험에서열처리온도에따른 SiC 의결정구조와기계적특성변화를알아보고자하였다. SiC 는화학기상증착 (chemical vapor deposition, CVD) 법을이용하여흑연기판위에박막형태로제조하였고결정성이낮은 SiC 를증착하기위해실제증착온도보다낮은온도에서증착하였다. 열처리온도는 Ar 분위기에서 1400 o C o C 구간에서실시하였다. SiC 코팅층의미세구조는 SEM 을이용하여관찰하였으며상분석은 X 선회절분석법을이용하여분석하였다. 이후열처리에따른기계적거동변화는 nanoindenter 를이용하여측정하였다. P2-S32-8 Dispersion of Hafnium Oxide in an Aqueous System HfO 2 분말의수계분산특성김준섭 *, 이세훈. 재료연구소초고온세라믹스분말은일반적으로열탄화환원법을이용하여합성하며고순도의나노분말을얻기위해서다양한방법들이시도되고있다. 재료연구소에서는방전플라즈마소결로 (SPS) 를이용하여 HfC, HfB 2 ZrB 2, ZrC 등고품위의나노초고온세라믹스분말합성을수행하였고순도및특성을향상시키기위한연구를지속하고있다. 이연구에서는 HfC, HfB 2 분말의원료분말인 HfO 2 분말의수계분산특성에대해조사하였다. 분산제의종류및첨가량에의한분산효과, ph 변화에따른분산효과, 나노분산기 (Microfluidizer) 사용에따른분산효과에대해서침전거동, 제타전위측정, 입도측정, SEM 관찰을통해서평가하였다. 이연구에서사용된 PEI, PEG, PAA 3종의분산제에서모두양호한분산특성을나타내었으며, 0.5 wt% 이상에서포화되는경향을나타내었다. HfO 2 분말은분산제를사용하지않은경우에도 ph5에서분산안정성을나타내었다. 나노분산기처리를수행하였을때응집되어있던입자들의분산효과가크게향상되었으며 3회이상처리했을때 10분이내에침전되는입자가 20% 이하로감소하였다. 처리후첨전되지않은입자의평균입경은 <100 nm 였다. P2-S32-9 Manufacturing and Characterization of Silicon Carbide Fiber Mat for Surface Heating Element for Infrared Heating Element 적외선발열체용탄화규소섬유매트면상발열체의제조및특성평가배성군 *, 신동근, 이윤주, 이현명, 조광연, 김우식, 권우택. 한국세라믹기술원면상발열체를이용한적외선가열은완전연소가가능하여환경오염물질이발생하지않으며, 특히, 탄화규소면상발열체는 1200 o C 이상에서도열화학적으로안정적이고적외선방사율이높아서에너지효율향상이가능하다. 본연구에서는폴리카보실란을이용한탄화규소섬유제조공정기술을적용하여면상발열체용탄화규소매트를제조하였다. 폴리카보실란을용융점부근에서방사하여섬유로제조한후, 산화안정화단계에서하중을주어섬유간접촉도를제어하여물리적접촉을통해매트화시킨후 1300 o C에서열처리하여화학적안전성을가지는다공성탄화규소매트를제조하였다. 제조된매트는 SEM을이용하여미세구조와섬유의굵기및섬유 간접촉도를관찰하였고, 상업용가스버너및마이크로웨이브를주사하여발열특성을평가하였다. P2-S41-1 Effects of Interfacial Energy and Annealing on the Microstructure of NiTe 2 Thin Films on Glass Substrates 유리기판에서의 NiTe 2 박막미세구조에대한계면에너지와어닐링의영향육태원 1*, Lee Sung Hyuk 1, 이규형 2, 김석준 1. 1 한국기술교육대학교, 2 강원대학교 A specific sputtering technique and an ex situ annealing process increased both the grain size of NiTe 2 thin films and the number of grains with basal planes parallel to the substrate. These properties are important when utilizing NiTe 2 as transparent electrodes, because larger grains lower the electrical resistivity. In addition, grains arranged in specific directions are helpful for exfoliation in order to reduce their thicknesses. The NiTe 2 films fabricated by the compound sputtering technique exhibited a lower interfacial energy between the film and the glass substrate as compared to those prepared by cosputtering. The lowered interfacial energy resulted in larger grains in the compound-sputtering films as compared to those in the cosputtered films. Ex situ annealing enabled a further increase in the grain size from 63.4 nm to 140 nm. *Corresponding author : Suk Jun Kim P2-S41-2 Effect of Multi-Substitution on the Thermoelectric Property of the Ca 11-x Yb x Sb 10-y Ge y (1.29 x 9.65; y = 0, 0.25) System Ca 11-x Yb x Sb 10-y Ge y (1.29 x 9.65; y = 0, 0.25) 시스템의열전특성에다중치환이미치는영향연구이준수 *, 유태수, 최웅진. 충북대학교 Thermoelectric (TE) materials can be used to convert the wasted heat from many different heat sources into electricity. In recent years, a series of binary and ternary pnictogen containing the small amounts of triels- or tetrels-doping, which include the A 11 Pn 10-x T x (A = Rb, Cs, Sr, Ba, Eu, Yb; Pn = Sb, Bi; and T = Si, Ge, Sn) systems has also been studied for its thermoelectric applications. In particular, according to the previous article about A 11 Sb 10 (A = Ca, Yb) system reported by Prof. Kauzlarich and Prof. Snyder, if a solid-solution system of Ca 11-x Yb x Sb 10 were successfully prepared, then the electronic property could be finely tuned between a metal and a semiconductor as in the Ca 1-x Yb x Zn 2 Sb 2 solid-solution. Therefore, in this research, we discuss our systematic experimental and theoretical investigations of the effect of Multi-Substitution using both of cationic and anionic elements on the quaternary tetrel compounds the Ca 11-x YbxSb 10-y Ge y (1.29 x 9.65; y = 0.25) System. These compounds have been synthesized by using either Sn metal-flux or arc-melting and characterized by both powder and single crystal X-ray diffractions. As a result, we expect to see the influence of cationic and anionic doping on the electronic properties as well as thermoelectric properties, the site-preference of cations and anions based on the QVAL values, and the rationale of some historically large ADP values on two particular atomic sites. In addition, we also discuss the results of SEM and EDS, and TGA analyses. 176 한국세라믹학회

197 포스터발표 II P2-S41-3 Influence of the Second-Phase Intercalation on the Termoelectric Properties of the Zintl Phase Ca 1.5 Yb 3.5 Al 2 Sb 6 : AlSb/InSb 최웅진 1*, 남근우 2, 이준수 1, 임성지 1, 유태수 1. 1 충북대학교, 2 한국지질자원연구원 Thermoelectric (TE) materials can be used to transfer the wasted heat from many different heat sources into electricity via the Seebeck effect. Zintl phase compounds are one of the attractive choices for TE application due to their intrinsically complex crystal structures and semiconducting characteristics. In particular, a Zintl compound Ca 1.5 Yb 3.5 Al 2 Sb 6, which is a member of the solid-solution Ca 5-x Yb x Al 2 Sb 6 (1.0 x 5.0) system including a mixed cation of Ca 2+ and Yb 2+, has shown a significantly enhanced ZT value as the structure type transformed from the Ba 5 Al 2 Bi 6 to the Ca 5 Ga 2 Sb 6 after annealing treatment. Two slightly different crystal structures of the Ba-type and Ca-type phases were characterized before and after annealing, respectively, by both powder and single-crystal X-ray diffraction analyses. The two title phases adopt the orthorhombic space group Pbam (Z = 2, op26). To further enhance ZT value of this Zintl compound, we have attempted to introduce a small amount of a second phase, such as AlSb and InSb, which can act as a phonon scatter. Thus, two binary compounds acting as a secondary phase, respectively, were presynthesized, then mixed with other elements to produce the targeted mixed-compound of Ca 1.5 Yb 3.5 Al 2 Sb 6 and AlSb or InSb. A series of theoretical calculations using tight-binding linear muffin-tin orbital (TB-LMTO) method were also performed to understand chemical bonding and the overall electronic structure of the title compounds. P2-S41-4 Two Strategic Approaches to Enhance the Thermoelectric Protperty of the Zintl Phase Ca 5 x Yb x Al 2 Sb 6 y Ge y System 진틀상 Ca 5 x Yb x Al 2 Sb 6 y Ge y 의열전물성향상을위한두가지접근임성지 *, 유태수. 충북대학교 The solid-solution Zintl compounds Ca 5 x Yb x Al 2 Sb 6 (1.0 x 5.0) system have been known to be synthesized by the arc-melting method, and two slightly different crystal structures of the Ba 5 Al 2 Bi 6 type and Ca 5 Ga 2 Sb 6 -type phases have been characterized using powder and single-crystal X-ray diffractions. In our earlier investigations, we revealed that the Ca 5 Ga 2 Sb 6 -type phase showed a better thermoelectric performance than that of the Ba 5 Al 2 Bi 6 -type phase. With this Zintl compound, two strategies to improve ZT value have been attempted. One is the Sb/Ge anion mixing to introduce a hall doping for the Ca 5 Ga 2 Sb 6 -type phase, and the other one is an introducing of a phase segregation from a parent Ca 5 Ga 2 Sb 6 -type phases into a mixture containing a Ba 5 Al 2 Bi 6 -type as well. For the Sb/Ge anion-mixing study, several compounds in the CaYb 4 Al 2 Sb 6-y Ge y system containing different ratios of Sb and Ge were synthesized by arc melting. After then, the compounds underwent the phase transition from the Ba 5 Al 2 Bi 6 -type to the Ca 5 Ga 2 Sb 6 -type structure via annealing process at 700 C for 2 weeks. The resultant compound indeed shows an enhanced ZT value implying the hole doping was partially successful. For a phase-segregation study, as synthesized Ca 1.5 Yb 3.5 Al 2 Sb 6 underwent an annealing process for various durations from one to three days. Once the two title phases were observed in powder X-ray diffraction experiment, a series of thermoelectric property measurements were conducted. P2-S41-5 The Effect of Sintering Pressure on the Thermoelectric Transport Properties of the Polycrystalline SnSe 소결압력이다결정 SnSe의열전수송특성에미치는영향조준영 1*, SIYAR MUHAMMAD 1, 남재현 1, 류종훈 1, 지상구 1, 진우찬 1, 배성환 2, 김진상 3, 박찬 1. 1 서울대학교, 2 경남대학교, 3 한국과학기술연구원 SnSe is considered as a very promising thermoelectric (TE) material since Zhao et al. reported ultrahigh ZT value of ~2.6 at 923 K in single crystalline SnSe. However, because of the poor mechanical properties and the difficulty of fabricating single crystal, many studies on making and improving the properties of polycrystalline SnSe were carried out. The electrical conductivity of polycrystalline SnSe is remarkably low compared to the single crystal SnSe due to the low carrier concentration. Several studies were carried out to increase the carrier concentration by doping elements. The enhancement of TE properties of polycrystalline SnSe, however, was not substantial. Polycrystalline SnSe has anisotropic crystal structure, which means that the electrical and thermal properties strongly depend on the crystal orientation. If the SnSe grains are preferred oriented along the favorable transport directions, the electrical properties can be improved. In this study, the textured polycrystalline SnSe samples were prepared by spark plasma sintering, and the effect of sintering pressure on the thermoelectric transport properties of polycrystalline SnSe were investigated. XRD and FE-SEM analyses were used to identify the phases and observe the microstructure of the SnSe samples. The change of ZT will be discussed in terms of the carrier concentration and the effective mass, and the effect of sintering pressure on the thermoelectric transport properties will be presented. P2-S41-6 High Thermoelectric Performance by Nano-inclusion and Randomly Distributed Interface Potential in N-type (PbTe 0.93-x - Se 0.07 Cl x ) 0.93 (PbS) 0.07 Composites Dianta Ginting *, Lin, Chan-Chieh, 이종수. Kyung Hee University In a composite of two dissimilar or homologous semiconductors with different energy band gaps or metal/semiconductor composites, we expect a band bending effect at the interfaces. The band bending effect by different Fermi levels of two compounds can selectively scatter carriers due to energy-dependent scattering time, resulting in the enhancement of Seebeck coefficient. In addition, the nano-inclusion in a matrix effectively scatters phonons. Here, we demonstrate the effect of electron and phonon scattering by nano-inclusion in n-type (PbTe 0.93-x Se 0.07 Cl x ) 0.93 (PbS) 0.07 (x = , 0.01, 0.1 and 0.2) composites, thereby the nano-inclusion in a matrix increases the Seebeck coefficient as well as reduces lattice thermal conductivity in (PbTe 0.93-x Se 0.07 Cl x ) 0.93 (PbS) The chlorine doping increases Fermi level to the bottom of conduction band giving rise to increase of electron concentration. Simultaneous emergence of high Seebeck coefficient and low thermal conductivity gives the exceptional ZT value of 1.52 at 700 K for small chloride doping (x = ), which is very high value in n-type thermoelectric materials. The randomly distributed interface potential, induced by Fermi level tuning, with nano-inclusion is a new criterion to analyze thermoelectric properties 1 한국세라믹학회 177

198 2017 년한국세라믹학회추계연구발표회 (1)Ginting, D.; Lin, C.-C.; Yun, J. H.; Yu, B.-K.; Kim, S.-J.; Rhyee, J.- S. Journal of Materials Chemistry A P2-S41-7 The Effect of Cr Doping on Thermoelectric Properties of Polycrystalline SnSe Cr 도핑이다결정 SnSe 재료의열전특성에미치는영향지상구 1*, 조준영 1, SIYAR MUHAMMAD 1, 남재현 1, 류종훈 1, 진우찬 1, 배성환 2, 박찬 1. 1 서울대학교, 2 경남대학교 Single crystal SnSe has been a promising thermoelectric (TE) material since it s high ZT value of ~2.6 at 923 K was reported. However, due to the weak mechanical strength and complicated processing to make single crystal SnSe, TE properties and studies to improve TE properties of polycrystalline SnSe have been reported. Polycrystalline SnSe has significantly low electrical conductivity compared to the single crystal SnSe due to the low carrier concentration. Therefore, enhancement of the carrier concentration is needed for polycrystalline SnSe to be used effectively in practical applications. One of the effective methods to control the carrier concentration is doping. The reported ZT values of doped polycrystalline SnSe, however, are not larger than 1.0. A new doping elements which can further improve the TE performance, can make the polycrystalline SnSe much more attractive for the practical application. In this study, the effect of the Cr doping on the thermoelectric properties of polycrystalline SnSe was investigated. Sn 1-x Cr x Se (x = 0, 0.01, 0.03, 0.05 mol%) powders were prepared by mechanical alloying. And then, Cr doped SnSe bulk samples were fabricated by spark plasma sintering. Phase and microstructure of the samples were analyzed by XRD and FE-SEM, respectively. The change of ZT will be discussed in terms of the carrier concentration, and the effects of Cr doping on TE properties of polycrystalline SnSe will be presented. P2-S41-8 Synthesis of Porous Cu 2 SnSe 3 Compound to Optimize Thermal and Electrical Conductivities for Efficient Thermoelectric Devices, using Spark Plasma Sintering 전기전도도와열전도도최적화를위한, SPS 소결을이용한다공성 Cu 2 SnSe 3 제조 SIYAR MUHAMMAD *, 조준영, 남재현, 류종훈, 지상구, 박찬. Seoul National University Thermoelectric materials are normally prepared using a sintering process to achieve high density. However, it has recently been shown that the introduction of porosity in thermoelectric compounds can lead to improved ZT due to very low thermal conductivity. Porosity may also be an advantage in conventional longitudinal thermoelectric modules in which a high thermal flux density can create problems. Wet chemistry routes for porous structures are very popular to get the controlled pore size with high porosity, but are not desirable for thermoelectric materials due to loss of electrical conductivity. To preserve the electrical conductivity of the porous thermoelectric structures, researchers use hot press method, followed by leaching of the inert species to get reasonable porosity. In such systems the mechanical properties of the bulk structure are degraded while electrical conductivity is not good enough to get desired thermoelectric efficiency. Herein we introduce a novel method to get reasonable porosity yet conductive Cu 2 SnSe 3 compound, during conventional spark plasma sintering process. Synthesis and optimization for the low thermal conductivity with minimum loss in electrical conductivity of the porous Cu 2 SnSe 3 structure will be presented. P2-S41-9 Developing the Hot Extrusion Process for the Preparation of Near Net Shape n-type Bi-Te-Se-based Thermoelectric Materials 열간압출을이용한고성능 / 고신뢰성 Near Net Shape N형 Bi-Te-Se 계소재제조황정윤 1*, 이규형 1, 김성웅 2. 1 강원대학교, 2 성균관대학교상온에서높은열전성능을갖는소재인 Bi-Te계합금은 Zone melting 공정을이용함으로써, 높은성능구현을위한고배향성의 ingot으로제조되고있다. 그러나낮은기계적강도에의한신뢰성문제로그응용이제한되어최근에는높은기계적강도를가지고있는다결정소재개발이진행되고있다. 열간압출및가압소결공정으로높은신뢰성과 Zone melting제조 ingot과동등한수준의소재제조가가능하지만, 열전소자제조시낮은수율문제로인한소재제조비용이증가하는문제가있어상용화에어려움을가지고있다. 본연구에서는열전소자제조시수율을혁신적으로개선할수있는 NNS(Near Net Shape) 소재제조가가능한열간압출기반의공정을개발하였고, 최적화된조성개발을통해기존다결정소재대비 10% 이상증대된높은열전성능을구현하였다. P2-S41-10 Influence of Spark Plasma Sintering Temperature and Time on the Thermoelectric Properties for n-type (Hf 0.5 Zr 0.5 ) Ti 0.3 NiSn Sb Half-Heusler Compound Nguyen Van Du 1*, Jamil 1, 신원호 1, 서원선 1, 김명호 2, 이순일 1. 1 한국세라믹기술원, 2 창원대학교 In this report, the half-heusler (Hf 0.5 Zr 0.5 ) 0.7 Ti 3 NiSn Sb compounds were prepared by vacuum induction melting method combined with annealing and ball milling process. The influence of spark plasma sintering (SPS) temperature (900, 1000, 1050, and 1100 o C) and time (10 minutes, 1 h and 2 h) at pressure of 70 MPa was investigated in the compound. The X-ray diffraction analysis revealed the half-heusler structure and small amount of impurity phases in all samples. The calculated lattice parameter from XRD data of the samples revealed a slightly decrease with higher SPS temperature. In addition, the SPS temperature increase up to 1100 o C led to increase of density and grain size, which resulted in an increase of thermal conductivity and electrical conductivity. The Seebeck coefficients of the samples show negative values indicating n-type semiconducting behavior, and no significant correlation with the sintering temperature and time. The power factor (PF) was evaluated from the measured data, and the significant variation of PF in SPS time and temperature dependence was obtained due to the electrical conductivity variation. With the examined conditions, the highest ZT value of at 865 K was achieved with the sample SPSed at 1050 o C for 10 minutes. P2-G5-1 Mechanical Properties of Polylactic Acid/Ions Substituted Beta-Tricalcium Phosphate Composite Using Ultrasonic Dispersion 초음파분산을이용하여제조한폴리락트산 / 이온치환베타- 삼인산칼슘복합체의기계적특성유경현 *, 김현진, 김용준, 윤석영. 부산대학교 178 한국세라믹학회

199 포스터발표 II Biodegradable polylactic acid (PLA) based organic/inorganic composites were widely used for temporary medical devices. Existence of biodegradable inorganic materials in composite enhanced biocompatibility and osteoconductive property. However, filler formed agglomerates in organic matrix and these agglomerates caused deterioration of mechanical properties. In this study, improve the mechanical properties of composite by enhancing filler strength and dispering filler more uniform. Biodegradable composites were prepared with PLA and β-tricalcium phosphate (β-tcp). In order to enhance the mechanical properties of β-tcp, Fe ions were substituted in β-tcp by co-precipitation method. For dispersity, ultrasonic dispersion method for different times was used. Mechanical properties of the composite was investigated by tensile and flexural tests. The results showed that degree of dispersity was more affecting the mechanical properties of PLA/β-TCP composites. P2-G5-2 On the Injectability in the Calcium Phosphate Bone Cement and the Effect of Granulation and Heat Treatment 인산칼슘계 Bone Cement의주사배출특성의의미와과립화및열처리효과오경식 *, 김현우. 안동대학교인산칼슘계시멘트의주사특성은 Kypoplasty 등척추치료에중요한역할을하는특성이다. 주사특성의정의에대해서는논란이있어서주사를위해필요한힘을의미하는경우와주사후 Filter pressing 등의현상이없이균질한페이스트상태를유지하는지를기준으로하는의견이있다. 본연구에서는주사성을단순히탑재된양대비배출된양으로해석하고배출된페이스트의경화후상을분석하는방법으로주사특성을보완하여평가하였다. 10 ml/ min의속도로 400 Pa의압력에서 Brushite계시멘트를 12초만에주사기에서배출하여주사특성을평가하였다. 크기가약 100 µm 인과립을열처리한결과주사성이증가하였다. 과립을 1000도에서열처리한경우에는과립과분말의혼합비에따라 82~88% 에범위에분포한반면 1150도에서열처리한결과주사성이 95% 이상으로증가하였다. 이와같은주사성의증가는열처리온도가높을수록비표면적이감소하여분말에제공되는액상의증가하기때문에점도를감소시킨결과로해석되었다. 경화된상은모두 Brushite로나타나정상적경화를일으키는것으로확인되었다. P2-G5-3 Mechanical Properties of 30 wt% Tricalcium Phosphate /Al 2 O 3 Composites 30 wt% Tricalcium Phosphate /Al 2 O 3 복합재료의기계적성질하정수 *, 정희철. 안동대학교 Tricalcium phosphate (TCP) 는생체활성이우수해뼈대체재료로매우적합하며, hydroxyapatite (HA) 와달리생체에재흡수될수있는성질이있어뼈재생을위한 scaffold로도유망하다. 그러나소결체의강도가낮아서큰하중이걸리는부위로의적용에문제가있다. TCP의기계적성질을향상시키기위해 Al 2 O 3, ZrO 2 등과같은강한재료를첨가하여복합화하는방법이주로연구되어왔다. 생체활성과기계적성질둘다만족하는재료를만드는또다른방법은 TCP를기계적성질이우수한재료에생체활성부여성분으로첨가하는것이다. TCP/Al 2 O 3 복합재료에대한이전연구들을보면, 25 wt% TCP 경우소결밀도가 64% 로매우낮았고 8.6 MPa (Brazilian) 의낮은강도가얻어졌다. 또 60 wt% TCP 경우소결밀도제시는없었고 84 MPa (3-p MOR) 의강도가얻어졌다. 본연구에서는 polymer complexation 방법으로합성한 TCP 분말을이용하 여 TCP 가 30 wt% 첨가된 Al 2 O 3 복합재료를제조한후소결밀도, 결정상, 미세구조, 강도, 파괴인성을분석하였다 o C, 2 h 소결하여 96% 의높은밀도를갖는복합재료가얻어졌고, 구성성분들간에반응이없었다. 그리고 1 μm 이하의 Al 2 O 3 입자들과 3 μm 이하의 TCP 입자들로구성된미세구조를가지고있었다. 강도는 61 MPa (Brazilian) 과 187 MPa (3-p MOR) 로서이전연구들의복합재료에비해매우향상된결과를얻었다. 또한파괴인성은 1.7 MPa m 1/2 (indentation) 과 2.5 MPa m 1/2 (notched beam) 로서단일 TCP 나 HA 에비해 2-3 배향상된결과를얻었다. P2-G5-4 Parylene Passivation Layer Coated in situ-synthesized Cadmium Sulfide Nanowire Photosensor for Using Medical Detection of Carcinoembryonic Antigen 파릴렌이코팅된카드뮴설파이드나노선광센서의의료진단응용김홍래 *, 봉지홍, 송현우, 김태헌, 박준희, 변재철. 연세대학교 The direct in situ synthesis of cadmium sulfide (CdS) nanowires (NWs) was presented by pulsed laser deposition and direct synthesis of CdS nanowire on IDE electrode. But CdS nanowire surface is oxidation by oxygen in the air. So we confirm the oxidant on the surfaces of the CdS NWs using X-ray photoelectron spectroscopy, transmission electron microscopy, and time-of-flight secondary ion mass spectrometry. We also fabricated a parylene-c film as a surface passivation layer for In situ synthesized CdS NW photosensors. And we investigated the influence of the parylene-c passivation layer on the photoresponse during the coating of parylene-c under vacuum using a quartz crystal microbalance and a photoanalyzer. Finally, we used the in situ-synthesized CdS NW photosensor with the parylene- C passivation layer to detect the chemiluminescence of horseradish peroxidase and luminol. And we applied it to medical detection of carcinoembryonic antigen (CEA). P2-G5-5 TiO 2 Nanowire Target Chip for MALDI-TOF Analysis of Small Molecule TiO 2 나노선칩을이용한저분자량물질의 MALDI-TOF 분석박종민 *, 노주윤, 김미라, 김문주, 송지천, 변재철. 연세대학교 MALDI-TOF mass spectrometry has become a powerful analytical tool for peptide and protein analysis. MALDI-TOF MS has various advantages compared to other analytical methods including easy sample preparation, sensitive detection (< fmol), and a wide detection range up to 500 kda. However, MALDI-TOF MS has a limitation with respect to quantitative analysis as well as in analysis of low molecular weight compounds due to intense chemical noise (background) from the organic matrix that has a molecular weight of ~300 Da. In this study, we fabricated TiO 2 nanowire target chip for MALDI-TOF MS to eliminate matrix noise, and to detect small biomolecules. TiO 2 nanowires integrated MALDI sensing chips were synthesized by mild hydrothermal process called wet corrosion process. SEM and TEM measurements revealed that morphology of synthesized TiO 2 nanowires have a diameter of 30 nm, and the crystal structure was determined by XRD and Raman spectrometry. The photocatalytic activity of TiO 2 nanowire chips was tested by the degradation of methylene blue under UV irradiation. The feasibility of detecting small biomolecules by TiO 2 nanowire chip was demonstrated with peptides, amino acids and drugs. In addition, quantitative analysis of glycine, arginine, glutamic acid, proline was 한국세라믹학회 179

200 2017 년한국세라믹학회추계연구발표회 carried out and limit of detection was 10 pm for glycine, arginine, glutamic acid, and 100 pm for proline. P2-G5-6 The Mechanical Properties of Dental Glass-ceramics 치과용글라스세라믹의기계적성질손시원 *, 김성민, 김준형, 임형봉. ( 주 ) 하스치과보철산업은기대수명의증가및삶의질향상으로인해지속적으로성장하고있는분야이다. 특히, CAD/CAM을이용한치과보철재료시장은꾸준히성장을하고있으며관련연구또한전세계적으로진행되고있다. 인간의치아를대체하기위해서는저작력을견딜수있는충분한강도, 대합치및인접치와의마모를줄일수있는적당한경도, 자연치와유사한색을나타낼수있는색및투광성등이치과보철재료로서의대표적요소로자리잡고있다. 현재이런요소들을만족하는대표적인재료로는글라스세라믹이있으며, 그중에서리튬다이실리케이트는현재가장일반적으로자연치를대체할수있는재료중하나로꼽히고있다. 이연구에서는, 리튬다이실리케이트치과용보철재료에서의대표적제품을이용하여구강내에서적용후나타날수있는기계적성질의변화를확인하였다. P2-G5-7 Bioinspired Bio Ceramic Scaffolds with Continuously Gradient Porous Structure Using Co-extrusion of Ceramic/ Camphene Feedrod 생체모방기술을이용한경사기능형다공성세라믹지지체제조기술안민경 *, 김종우, 맹우열, 고영학. 고려대학교생체다공성세라믹소재는외상또는선천적기형및결손으로인하여손실된인체의뼈를대신하기위해체내에매식되는소재로서치과용골충진제및정형외과용골대체재로다양한의료분야에서사용되어지고있다. 인체의뼈구조를모방하여만들어지는인공뼈의경우기공구조 ( 기공크기. 형상, 기공율 ) 에의해기계적특성및생체특성에영향을미친다. 인체의뼈구조를재현하기위한다공성인공뼈의제조기술로, 특히기존기술이갖는단순치밀층과단순다공성구조의한계를극복하여기계적특성을고려한치밀층의두께가제어가능하고생체특성에영향을주는기공구조가연속적으로증진되는경사기능형다공성세라믹시편을제조하였다. 또한마이크로 / 마크로이중기공의경사기능형다공성구조를가지는세라믹시편을제조하였다. 이중경사기능구조를가지는다공성세라믹시편을제조하기위하여높은세라믹분율을갖는세라믹 / 캠핀기반슬러리로치밀층을제조하고다공성구조를제조하기위하여쉽게제거가가능하고또한압출이가능한캠핀동결매체를이용한슬러리를제조하여각다른두성형체를제조하고제조된두성형체를적층한후연속적으로압출하여경사기능형파이버를제조하고동시에 3D프린팅기술이용하여생체모방경사기능형다공성세라믹소재를제조평가하였다. P2-G5-8 Characteristics of Al 2 O 3 -Matix Composites Fabricated with 30 wt% Hydroxyapatite 30 wt% Hydroxyapatite가첨가된 Al 2 O 3 기지복합재료의특성하정수 *, 한유정, 신희섭, 한창민, 권명진, 이재국, 윤은섭. 안동대학교 Hydroxyapatite (HA) 는생체활성이우수하지만강도가낮은단점으로큰하중이걸리는정형외과나치과영역에서의다양한활용이제한되고있다. HA의기계적성질을향상시키기위해 Al 2 O 3, ZrO 2, 또는 mullite와같은강한재료를보강성분으로첨가하여복합화하는방법이주로연구되어왔다. 생체활성과적절한강도를 겸비한재료를만드는또다른전략은 HA 를강한재료에생체활성부여성분으로첨가하는것이다. 본연구에서는 Al 2 O 3 에 HA 가 30 wt% 첨가된복합재료의제조를시도하였다 o C 와 1250 o C 에서각각소결이가능한 Al 2 O 3 와 HA 분말들을혼합, 성형후 1300 o C/2 h 과 1350 o C/2 h 두가지소결조건으로시편을제조하였다. 밀도측정, XRD, SEM, 3 점강도시험을통해시편을분석하였다. XRD 분석결과두온도에서다 HA 상은없고 TCP(α, β 혼재 ) 상이 Al 2 O 3 와함께존재하였다 o C 의경우 CaAl 4 O 7 상이추가로확인되었다. 이는 HA 의분해가발생하였고, 분해생성물인 CaO 가더높은온도에서는 Al 2 O 3 와반응까지했음을말해준다. 소결밀도는 69% 와 78% 로서매우낮았다. HA 의분해를방지하기위해 MgF 2 를 HA 무게에대해 6.6 wt% 를첨가하여동일한조건으로소결하였다. 이경우 TCP 상대신 fluoroapatite (FA) 상이 Al 2 O 3 와함께존재하였다. 이는 MgF 2 첨가로 1350 o C 까지 HA 결정구조가안정화되었음을보여준다. 소결밀도는 79% 와 87% 로서, 그리고강도는 104 MPa 와 143 MPa 로서두경우다 1350 o C 시편이더높았다. 단일 TCP 와 HA 의강도는각각 15 MPa 과 26 MPa 정도로알려져있는데본연구의 FA/ Al 2 O 3 복합재료는이보다훨씬우수하다. P2-G5-9 Machanical Strength of Artificial Bone Prepared by the Precipitation of Hydroxyapatite/Fish Collagen Nanocomposite 수산화아파타이트 / 어류콜라켄의나노복합체석출에의해제조된인공골의기계적강도김병기 1*, 장명철 1, 황재호 2. 1 군산대학교, 2 ( 주 ) 마린테크노 Artificial bone was fabricated by using the hydroxyapatite/collagen nanocomposite, in which the nanocomposite slurry was prepared by wet precipitation of hydroxyapatite in aqueous collagen solution. We used as-received fish collagen prepared from Salmon skin. Freeze dried collagen [MarineTechno, Korea] was solved in acetic acid and DI H-O. The dry fish collagen was easily solved in aqueous acetic acid solution and Hydroxyapatite precipitates were well formed in fish collagen acetic acid solution. The formed HAp/COL nanocomposite slurries were filtered by using Glass filter in Aspirator. The filtering rate was higher than that of HAp/COL nancomposites using animal collagen such as pig skin or cow bone. The samples were dried at 50 o C in air drier. We evaluated mechanical strength such as compressive strength and tensile strength. The compressive strength was attained to 70MP and tensile strengh samples could be fabricated by using a special HDPE mould and Aspirater filtering. FT-R analysis was done to conform the chemical bonding between collagen and hydroxyapatite. Characterization was done by using DTGA,SEM and XRD analysis. P2-G5-10 Effect of ph and Reaction Temperature on the Preparation of Hydroxyapatite Powders by Co-precipitation 공침법을이용한수산화아파타이트분말제조에미치는 ph 및반응온도의영향이정아 *, 이인호, 김정주. 경북대학교인산칼슘계화합물의하나인수산화아파타이트는화학조성과결정구조가사람의뼈와유사하여생체접합성이우수한이식재료로알려져있으며인공뼈와인공치근등에이용되고있다. 제조방법으로는수열합성법, 용액침전법등의습식법과고상반응합성법의여러방법이있으나, 제조분말의순도, 경제성, 소결성등 180 한국세라믹학회

201 포스터발표 II 에서용액침전법이가장일반적으로사용된다. 본연구에서는 Ca(NO 3 ) 2 4H 2 O 와 (NH 4 ) 2 HPO 4 를출발원료로하여공침법을이용하여수산화아파타이트분말을제조하였다. 이때 Ca/P ratio, ph 그리고반응온도를변화시켜화학양론조성의수산화아파타이트가합성되는조건을찾아보았으며 XRD, FT-IR, SEM 등을이용하여제조된분말의특성을분석하였다. Ca/P 의 ratio 가증가할수록, ph 가높을수록그리고반응온도가증가할수록수산화아파타이트단일상이생성되었다. P2-G5-11 Photo-curable 3D Plotting Technique for Complexshaped Architecture with High Shape Retention Using a Ceramic Suspension 광경화세라믹슬러리기반고형상유지능 3차원플라팅기술맹우열 *, 이정빈, 조인환, 고영학. 고려대학교 This study proposes a novel way of creating three-dimensional ceramic object with pre-determine computer modelling design file by photo-curing-assisted 3D plotting technique, which can rapidly photopolymerized in situ by UV light throughout extruding green filament mixture of biphasic calcium phosphate (BCP) ceramic powders and photocurable monomers and photo initiator, dispersant by a fine nozzle. In particular, a mixture of 90 wt% diruethane dimethacraylate (UDMA) and 10 wt% triethylene glycol dimethacrylate (TEGDMA) enables the favorable extrusion properties which can have a shear thinning behavior. Most importantly, the slurry also has good shape retention because of high green strength after photo-polymerization. This result has been proven by a free-standing helical architecture, which was successfully produced without any supporting materials. In addition, the unique in situ photo-polymerization process during extrusion allows the green filaments to be strongly bonded each other, while maintaining their circular cross-section, and thus a ceramic scaffold of interconnected pore with a tightly controlled porous structure could be produced. This innovative approach allows for the formation of complex shape architecture such as dense/porous object of mimic natural bone structure. P2-G5-12 Photo-curable Ceramic-based 3D Printing Technique for Porous Bio-ceramic Scaffolds 광경화성세라믹기반 3D 프린팅기술을이용한고품질다공성생체세라믹스캐폴드제조이정빈 *, 고영학, 맹우열, 이윤희. 고려대학교본연구에서는생체친화성이우수한세라믹분말중하나인 BCP (biphasic calcium phosphate) 분말을광경화성모노머인 HDDA(1,6- Hexanediol diacrylate) 에고함량 (50 vol% 이상 ) 으로혼합하기위해, 분말분산을위한적합한분산제 (CC-9) 를선정하였고, 3D 프린팅 (Digital Light Processing) 에적용가능한흐름성을가질수있도록, 희석제 (Decalin) 를첨가하였다. 희석제의경우, 함량이증가함에따라, 성형체의수축이줄어들어형상재현성이높아지지만, 상대적으로전체조성에서차지하는모노머의비중이떨어져성형체의강도가저하되는경향을보이기때문에, 구조물이충분한강도를가질수있는조성을최적화하였다. 이렇게제조된세라믹 / 모노머복합물은 3D 프린팅 (Tape-casting 원리활용 ) 하기에적합한점도 ( 세라믹함량 50 vol% Pa s) 를가지며, 최종적으로장비의광파장 (405 nm) 에맞는광경화개시제 (P.P.O., 2 wt%) 를 Photo- DSC를통해평가하였고, 경화시간등을조절하여광경화거동을최적화하였다. 3차원다공성스캐폴드는세라믹함량이 45 vol% 와 50 vol% 이상의복합물을제조하였고, 이를 1250 o C 에서소결하여평가를진행하였다. 주사전자현미경으로미세구조를관찰한결과, 소결체가변형이나결함등이없이형상을잘유지하였으며, 세라믹함량이증가함에따라미세기공이줄어들며, 더욱치밀화된것을확인하였다.3 점굴곡강도를평가한결과, 동일한기공율 (55 ± 0.13 vol%) 을가지지만, 복합물내무기물함량이 45 vol% 인샘플 (19.96 ± 1.8 MPa) 에비해, 50 vol% 샘플 (29.28 ± 2.7 MPa) 의경우, 함량이증가함에따라매우높은기계적강도를가지는것을확인하였다. 또한생체유사용액인 SBF 용액에서아파타이트생성능을평가하였다. P2-G5-13 Preparation of Biphasic Calcium Phosphate (BCP) via Wet Chemical Preparation 습식화학적합성법에의한 Biphasic calcium phosphate (BCP) 의제조및물성이병우 *, 홍일곡. 한국해양대학교 Biphasic calcium phosphate (BCP) consists of both tricalcium phosphate (β-tcp) and hydroxyapatite (HA) has great attention due to its enhanced biocompatibility. In this study, bioactive BCP nanoparticles were prepared by two different wet chemical methods: simple precipitation and hydrothermal process. Solution processes have been proven to be one of the easiest ways of preparing nanosize powders. The wet chemical processes offer the advantageous features such as simple, low-cost and low-temperature synthesis. The BCP powders were prepared through the processes using calcium hydroxide as calcium precursor, phosphoric acid as phosphorus precursor under various preparative conditions. The powders prepared were calcined at different temperatures ranging from 500 C to 900 C to study the phase developments. The aim was to evaluate the morphology, particle-size, crystallinity and phases of the powders obtained by the precipitation and the hydrothermal process. The nanoparticles were investigated by high resolution electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. P2-G5-14 Development of Engineering Techniques for the Improvement of Organic Waste-fed Methane Biogas Producing Systems 유기성폐기물자원유래메탄바이오가스생산공정개선을위한 Engineering 기술개발권정회 *, 송효순, 김영민, 박대섭. 에코바이오홀딩스 ( 주 ) 우리나라기준유기성폐기물의가용물량은약 676만 ton/ 년으로추정되며, 이가운데약 4.6% 에해당하는 31만 ton/ 년을에너지화하여활용하고있다. 음식물류폐기물의약 93% 는퇴비및사료등으로재활용처리되고있다. 2013년음식물쓰레기에너지화추진을위하여음식물쓰레기바이오가스화시설 7개소를추가로설치하고음식물쓰레기투입병합바이오가스화시설설치를확대하고있다. 염분및이물질함유에따른품질문제와수요처부족으로인해재활용되는음식물쓰레기중일부를에너지화로전환, 바이오가스화시설의효율성을높이기위해서하수슬러지, 축산분뇨를병합처리하는추세이다. 이에당사에서는원료윤연성제고를위한 package화된원료맞춤형다중모듈형전처리기술개발을연구중이다. 현장에서반입되는유입물 (220 ton/ 일 ) 을물리적전처리후, 균질화조에미생물촉진제를투입하여, 메탄가스발생량증 한국세라믹학회 181

202 2017 년한국세라믹학회추계연구발표회 가와저해물질인황화수소의감소를자동화하기위해 MPC 시스템을적용하여, 플랜트운영공정개선을개발중에있다. P2-G6-1 The Effect of BaO on Physical Properties in V 2 O 5 - BaO-ZnO Glass System 김소영 1*, 김선훈 1, 박준 1, 최주현 1, 김진혁 2. 1 한국광기술원, 2 전남대학교 In today s display industry, laser sealing is a key technology in order to achieve the high level of functionalization, miniaturization and durability. The effective glass frit composition used to absorb laser energy and to seal commercial OLED mobile device. As organic based panels play a key role in display device, customized sealing materials and processing is to be developed according to improve the reliability and productivity for display devices. In this study, V 2 O 5 - BaO-ZnO glass system was prepared by general melting and quenching method. The effects of BaO vs ZnO on thermal (Glass transition temperature, Softening temperature), mechanical (Knoop hardness) and thermomechanical (thermal expansion coefficient) properties were investigated for V 2 O 5 -BaO-ZnO glass system. As the amount of BaO increased, it is found that glass transition temperature and Knoop hardness linearly increased. Considering the results obtained from the experiments above, V 2 O 5 -BaO-ZnO glass system is appropriated to laser sealing applications such as OLED mobile device. P2-G6-2 Fabrication of Phosphor in Glass using Glass-fusing Technique for White LED Application 백색 LED 응용을위한파유리를사용한형광체유리의합성방법연구이우철 *, 홍우태, 이유진, 양현경. 부경대학교 Light emitting diodes (LEDs) have been developed as a solid state lighting and are still investigated widely for improving its power and efficiency. Laser diodes (LD) based light source,which is a part of development of light source, to become a next generation light source in illumination and display applications. In a conventional method, A film that consist of phosphor and epoxy is used for color convertor. However, epoxy film is not applicable to high power LED and LD due to degradation of epoxy. From this reason, the Phosphor in Glass (PIGs) has been reported due to thermal stability compared with conventional film. In this study, we fabricated the the PiGs using glass-fusing technique with domestic microwave oven. The PIG compose to a common soda-lime glasses and YAG:Ce phosphor was fabricated in order to characterize stability and luminescent properties of PIGs. In the synthesis procedure, (1) microwave absorption time and (2) weight ratio between YAG:Ce phosphor and glasses were optimized in order to apply in a high power LED and LD. P2-G6-3 Physical Properties of D-glass Fibers According to Continues Fiber Spinning Conditions 연속섬유방사조건에따른 D-glass fiber의물리적특성정보라 1*, 이지선 1,2, 이미재 1, 임태영 1, 이영진 1, 전대우 1, 신동욱 3, 김진호 1. 1 한국세라믹기술원, 2 인하대학교, 3 한양대학교가장보편적인복합소재로사용되는 E-glass (electrical glass) fiber 는여러장점을보유하고있지만 1 MHz의주파수에서 6.7~7.8로 높은유전율을가지므로기판소재에는적합하지않다. 기판소재에서유전율이높다는것은전력손실이크다는것을의미한다. 그러므로 E-glass 의높은유전율을보완하는 D-glass (dielectric glass) 가필요하다. D-glass 는 1 MHz 에서 3.8 ~ 4.2 로같은조건에서 E- glass 절반정도의유전율을가진다. 전자재료에서 D-glass 는섬유의형태로가공되어전자기판의보강재로활용된다. 본연구에서는 D-glass 조성의모유리를제조해투과율, XRD 와유전율을측정하였다. 또한모유리를 1400 o C 에서 100 ~ 300 rpm 으로 rpm 의변화를주어 D-glass 섬유를제조하였다. 그후 D-glass 섬유의싱글필라멘트를이용해직경을관찰하는등섬유의물리적특성을확인하였다. P2-G6-4 The Effect of Nano-NiO Additive on the Adhesion Strength and the Bubble Structure in Vitreous Enamels 에나멜의밀착강도와버블구조에미치는나노 NiO 첨가제의영향김주형 *, 류봉기. 부산대학교 The effect of NiO nano powders on the adhesion strength and the fishscale has been investigated. The ball drop test indicated that the adhesion strength was greatly increased by adding mill addition of nano powder of NiO. Enamel adhesion strength and bubbling microstructure was studied using optical and scanning electron microscopy (SEM) along with energy dispersive spectroscopy (EDS) analysis. The results showed that nano powder of NiO as mill addition can change the interface composition and structure, and ensure interdiffusion between enamel and steel. Also, bubble gas size had more larger as the amount of mill addition increased and cracking of the enamel layer, generally referred to as fish-scaling, was reduced. P2-G6-5 Refractive Index Measurement of Nanoparticle Dispersed Liquid and Its Application for the Becke Line Method 나노입자분산액의굴절률측정및베케라인측정법적용이지인 1*, 신상열 1, 정운진 2, 김진호 3, 조성훈 4, 최용규 1. 1 한국항공대학교, 2 공주대학교, 3 한국세라믹기술원, 4 이화정공산화물계열나노입자가균질하게분산된액상소재는해당입자의입도및분산특성에따라나노입자분산이전의기존액체보다높은굴절률을가지게된다. 나노입자가고르게분산되어상분리가발생하지않고산란이적게발생하는나노입자분산액의굴절률이상용표준굴절액이가지지못하는 ~1.8 이상으로향상되는경우, 베케라인측정법의새로운매질로적용될가능성이있다. 이에본연구에서는최소편각법을적용하여산화물나노입자분산액의굴절률을측정하였으며, 굴절률과나노입자함량과의관계를정량적으로파악하였다. 나아가나노입자분산액의굴절률을더욱향상시키기위한시도를하였으며, 이러한분산액을활용하여베케라인측정법으로도로표지용유리알의굴절률을평가하고자하였다. P2-G6-6 Fabrication of Phosphor-in-glass with High Luminous Efficacy for High-power White LEDs 고출력백색 LED용고효율 phosphor-in-glass 제조남윤희 1*, 김병호 1, 김선욱 1, 이영진 1, 김진호 1, 전대우 1, 이미재 1, 박태호 2, 이정수 2, 황종희 1. 1 한국세라믹기술원, 2 ( 주 ) 베이스 Phosphor-in-glass (PiG) has been studied as a color converter for a white LED due to its outstanding light conversion efficacy and longterm stability compared to conventional color converters. Recently, as the demand on high power LED is increased, color converters are 182 한국세라믹학회

203 포스터발표 II required to improve luminous efficiency, and therefore, we focused on minimizing the light loss to increase the efficacy. We prepared glass, BaO-ZnO-B 2 O 3 -SiO 2 system to improve the refractive index and pulverized it through dry-ball milling to make glass frits. The particle size of frits was controlled by changing milling time. To fabricate PiGs, we added phosphor into the resultant glass frits and sintered them. We measured the optical properties of PiGs and determined the optimum pulverization condition. As the particle size of the glass frit increased, transmittance of sintered glass (without phosphor) increased at the visible range. Specially, the highest luminous efficacy of the PiG was obtained when the particle size of glass frit was similar to phosphor particle, and this is because of the scattering decrease which was occurred between glass frits and phosphor particles. P2-G6-7 Redox Behavior of Sn in Akali Free Aluminoborosilicate Melts Alkali free aluminoborosilicate 용융유리에서 Sn의산화환원거동최근호 *, 김기철, 강소희, 김기동. 군산대학교유리제조산업에서용융유리내다가원소의산화환원거동은유리제조과정뿐만아니라최종품질에서도굉장히중요시된다. 이러한다가원소의산화환원거동은전기화학적측정방법중하나인 Square Wave Voltammetry (SWV) 법으로추적이가능하며, 대부분의연구는 Pt 도가니를사용하여진행되어왔다. Pt 도가니를사용하여 SWV를진행할경우, 도가니와용융유리계면에서의유리조성변화가없으며, 여러번사용할수있다는장점을가진다. 하지만실험중발생하는전기장의영향으로인해 voltammogram에많은 noise를야기한다는단점이있다. 본연구에서는 Alkali free aluminoborosilicate 계유리조성에다가원소로서 Sn을첨가하여산화환원거동을서로다른 3가지재질의도가니를사용하여고찰하였다. 실험은 1400~1100 o C에서진행되었으며, SWV와 Oxygen activity 측정을통해 redox ratio, 자유에너지, 확산계수를산출하여각도가니에따른영향을비교분석하였다. P2-G6-8 Synthesis of Large Diameter, High Dipersive Ge-Sb-S- Ga Chalcogenide Glass System 대구경, 고분산 Ge-Sb-S-Ga 칼코지나이드유리의합성최근창 *, 박준, 최주현. 한국광기술원 Chalcogenide glasses,composed of chalcogen elements (S, Se, Te), have been interesting objects for studying in optical system due to their unique properties like high refractive index and non-linearity. They have good transmittance at NIR and Mid IR wavelength range, so they can be strong candidates that would substitute for expensive germanium lens in the optical infrared industry. In this study, we optimized synthesis condition and confirmed thermal, structural, mechanical and optical properties for lens applications. The Ge-Sb-S- Ga chalcogenide glass ingot up to 60 mm diameter were synthesized by melt-quenching method: sample was quenched in water after melted in rocking furnace. After annealing, we confirmed absence of crack inside ingot using IR camera system and amorphous phase using X-Ray Diffraction (XRD). We also measured Differential Scanning Calorimetry (DSC) and Thermo Mechanical Analyzer (TMA) to know the glass transition temperature (Tg), thermal conductivity and thermal expansion coefficient. The averaged ~ 60% transmittance and ~ 2.6 refractive index were obtained by using FT-IR and refractometer at IR range respectively. Finally, we successfully set up synthesis process making six ingots with good quality per 1 process for mass production. P2-G6-9 Physical Properties of AR-Glass Fibers with Refused Coal Ore in Continuous Fiber Spinning Conditions 연속섬유방사조건에따른석탄폐석을함유한 AR-glass 섬유의물리적특성이지선 1,2*, 임태영 2, 이미재 2, 전대우 2, 이영진 2, 현승균 1, 김진호 2. 1 인하대학교, 2 한국세라믹기술원본연구에서는, 40 wt% 의석탄폐석을함유한 AR-glass 조성을이용하여연속방사에의해유리섬유를제조하였다. 먼저마블유리의용융특성을확인하기위하여원료를백금도가니에넣고 1650 o C로용융시킨후서냉하였다. 맑은마블유리인지확인하기위해서투과율을측정하였고고온점도를측정하여연속방사조건을조사하였다. 와인딩속도를 100~700 rpm 변화에따른직경의변화를관찰하였다. 섬유화온도를 1240~1320 o C 변화에따른직경의변화또한확인하였다. 제조된방사섬유의특성은광학현미경관찰, 인장강도, 탄성률, 내알칼리테스트등으로확인하였다. P2-G6-10 Development of Porous Refractory Materials Used Coal Tailings 선탄경석을활용한다공성내화소재개발김효성 1*, 윤상옥 2, 김세훈 2, 김상호 1, 김동표 2. 1 강원테크노파크, 2 강릉원주대학교선탄경석은 SiO 2 와 Al 2 O 3 가주성분인점토광물과장석광물로구성되어있어세라믹산업에활용될수있는원료임에도재사용없이적치되는실정이다. 본연구에서선탄경석을자원으로활용하기위해 Foam glass 또는 Multicellular glass라고불리는발포유리를제조하여특성을평가하였으며, 선탄경석을발포유리의원료로사용하기위한유리조성을개발하였다. 선탄경석 : 폐유리 : 발포제를 1:1:1로혼합하여발포유리를제작하여밀도, 기공률, 열전도도, 등을측정하여물성평가를진행하였다. P2-S61-1 Fabrication of Dense Plasma Resistant YAS Frit Coating Layer 내플라즈마성 YAS계치밀코팅층제조박의근 *, 이현권. 금오공과대학교반도체제조공정에서초미세선폭화가진행됨에따라플라즈마공정이진행되는챔버에서오염입자의발생을저감하는것이매우중요한주제가되고있다. 이를위해내플라즈마성이우수한소재의채택이광범위하게이루어지고있다. 현재반도체공정용핵심부품의소재로는 Al 2 O 3, SiC, AlN, Y 2 O 3 등이사용되고있으며최근에는내플라즈마성이우수한 Y 2 O 3 를이용한연구개발이진행되고있는추세이다. 고가의 Y 2 O 3 를사용하는대신재료에투입되는비용을절감하기위하여코팅상의내플라즈마소재에관한연구가진행되고있으며일반적으로용사코팅방법이활용되고있다. 하지만, 용사코팅의경우플라즈마식각공정에서코팅박리가일어나고그에따른입자탈락으로인한공정상의오염을야기시키는문제점이있으며, 고가의장치를별도로필요로하여제작단가를상승시키는요인으로작용한다. 본연구에서는소재의공정단가를낮추면서 Y 2 O 3 의내플라즈마특성에버금가는치밀코팅층을연구개발하고자하였다. 실험은내플라즈마성 YAS(Y 2 O 3 -Al 2 O 3 -SiO 2 ) 계프릿을제조하고, 제조된프릿을코팅조건을달리하여소결알루미나세라믹스표면에고밀도의 YAS계코팅층을형성하였다. 제조된 YAS계코팅층을조 한국세라믹학회 183

204 2017 년한국세라믹학회추계연구발표회 건에따라비교분석함으로써 YAS 계치밀코팅층을형성하기위한가장적절한공정을제시하고자하였다. P2-S61-2 Fabrication of Hydropobic Anti-Reflection Thin Film by using Screen Printing Method Screen printing법을이용한내오염반사방지막제조. 최창식 1*, 이미재 1, 이영진 1, 전대우 1, 현승균 2, 김진호 1. 1 한국세라믹기술원, 2 인하대학교 Screen printing 법을이용하여유리기판위에반사방지막을제조하였다. 반사방지 (anti-reflection, AR) 막은태양전지, LED, 광검출기등의광전자소자와디스플레이효율과투과도를향상시키기위해적용되고있다. 현재적용되고있는반사방지막필름은고가의건식법을이용되고있지만, 건식법의경우생산단가및대면적화가어려운문제점을가지고있다. 이러한문제를해결하기위해본연구에서습식공정중 sol-gel법을통해 SiO 2 용액을얻었으며, 유기화합물을합성하여코팅액을제조하였다. 그후코팅공정이간단하며대면적화가가능한 screen printing법을이용하여반사방지막을제조하였다. P2-G8-1 Study on Electronic Structures of HfO 2 Polymorphs using First-principles Calculations 제일원리계산을이용한 HfO 2 Polymorphs의전자구조연구우태호 1*, 이효동 1, 권길식 1, 오민욱 2. 1 주식회사경원이앤씨, 2 한밭대학교실리콘기반 MOSFET(Metal Oxide Semiconductor Field Effect Transistors, 금속산화물반도체전계효과트랜지스터 ) 에서는전통적으로이산화규소 (SiO 2 ) 를유전체물질로사용하였다. 트랜지스터집적도증가로인해게이트유전체인이산화규소 (SiO 2 ) 에서많은누설전류등이발생되면서, 이를대체하기위한재료로유전상수 K 가높은물질에대한연구가증대되었다. HfO 2 는높은유전상수및넓은밴드갭으로 MOSFET에서이산화규소 (SiO 2 ) 를대체하는물질로사용되지만, 순수한 HfO 2 는 SiO 2 보다열적으로불안정하다. 이를보안하기위해 Si, La, N 같은특정원자를도핑하는연구가활발히진행중이다. 한편 HfO 2 는단사정계 (monoclinic), 정방정계 (tetragonal), 입방정계 (cubic) 등과같은 polymorphs를가지고있고, 제조공정에따라다양한 polymorphs가발현된다. 또한 HfO 2 의 polymorphs는도핑등에의해서도제어되는것으로보고되고있다. 따라서본연구에서는제일원리계산법 (MedeA-VASP) 을이용하여각 HfO 2 polymorph의형성에너지및전자구조를계산하였다. 또한도핑원소에첨가됨에따라단사정, 정방정, 입방정결정계의상안정성변화를전자구조계산관점에서해석하였다. P2-G8-2 First-principles Investigation of Cu Based Ruddlesden- Popper Phase for Highly Efficient Lead-free Photoactive Materials 고효율무연광활성물질연구를위한구리기반 Ruddlesden- Popper 구조의제일원리분석도경연 *, 김성훈, 이동화. 포항공과대학교 Depletion of fossil fuels and increased pollution has increased the need for developing new energy sources. Among various renewable energy techniques, solar cell has received a great attention. Especially, organic-inorganic hybrid perovskite solar cell based on (CH 3 NH 3 )PbI 3 has received much attention since high efficiency has achieved by easy manufacturing process. However, the inclusion of toxic lead (Pb) in the hybrid perovskite has led to develop new materials that can substitute Pb. In this study, A 2 BX 4 structure is chosen to see whether the variation of components can lead to possible candidates. Our First- Principles investigations have led to understand strong correlation between bandgap and constituent elements (A = alkali metals, B = Cu, X = halide ions). In addition, we have identified physical origin of the variation of bandgap in Ruddlesden-Popper perovskite structure. Our findings will be a cornerstone for designing novel Pb-free photoactive materials. P2-G8-3 First Principle Investigation on Forming-free Process of MAPbI 3 based Hybrid Perovskite Memristor 제일원리를통한 MAPbI 3 기반멤리스터의 forming free process에대한분석김성훈 *, 이동화. 포항공과대학교 Because of high density, fast switching speed and low power consumption, memristor has received a great attention as a next generation nonvolatile memory. Although oxide-based memristor have been studied the most, various technical issues have limited their usage as practical memory devices. Recently, MAPbI 3 -based organic inorganic hybrid perovskite memristor shows promise for its potential application as a next generation memory since the low operating voltage and high on off ration have been achieved. In addition, forming free resistance switching character is another attractive feature since it can reduce the process for an initial filament formation in conventional oxide-based memristor device. However, the atomistic origin of the forming-free resistance switching process has not been clearly understood. In this study, thus First-principles density function theory (DFT) is employed to understand the forming free resistance switching of MAPbI 3 based memristor device. Our study has identified that the forming free operation is a result of defect induced charge separation in MAPbI 3 P2-G8-4 Establishment of a Numerical Model on Switching Behaviors of Resistive Memory 저항메모리의스위칭거동에대한수치해석모델수립민경환 *, 권용우. 홍익대학교차세대메모리중하나인 RRAM은기존의메모리들과비교하여상대적으로간단한 MIM(Metal-Insulator-Metal) 구조를통한 scaling-down, 동작속도, 저전력등의이점으로각광받고있다. 최근 RRAM의거동 (forming, set, reset) 을설명하기위한다양한모델들이제시되고있다. RRAM의 switching operation은 conductive filament(cf) 의형성과파괴에의해일어난다. 이러한현상에대한이해는금속산화물내의금속이온및공공, 산소이온및공공의거동, 전압인가에따른전기적, 그리고그로인한열적해석등을기반으로한다. 더불어금속의 redox reaction, dielectric과 electrode 의계면에대한해석등또한이루어져야할것이다. 하지만아직 transient state에서이러한현상들에대해동시적해석을통한 RRAM의 set/reset에대한 switching mechanism은명확히규명되어있지않다. 본연구에서는 CF의정전기적거동대한요인들을단순화하여주가되는요인인결함형성에대한 quasi-stationary simulation을진행하였다. 그리고 voltage 변화에따라스위칭모델에기반하여 high resistance state(hrs) 에서 low resistance state (LRS) 로의변화를 CF 형성을토대로해석하였다. 184 한국세라믹학회

205 포스터발표 II P2-G8-5 Study of Phase-Change Memory Cell Geometry for Improvement of Multi-leveling Characteristics 다치화특성의향상을위한상변화메모리의구조에대한연구신민규 *, 권용우. 홍익대학교기존의 von Neumann 구조를바탕으로하는뉴로모픽칩기술은많은수의뉴런과시냅스소자로인하여에너지효율이낮은문제점을가지고있다. 이를해결하기위해시냅스소자로써차세대메모리중그기술의성숙도가가장높은상변화메모리가연구되고있다. 상변화메모리는다른메모리들과는다르게 0과 1사이에많은수의중간상태를가질수있고, 이는적은수의소자로실제시냅스의연속적인연결강도를모사할수있어뉴로모픽칩의에너지효율을높이기에유리하다. 본연구에서는이러한다치화 (multilevel) 특성을향상시키기위해저항의 On/off ratio를키우고중간상태를가지는 current나 voltage의영역인 transition 영역을넓히는것에초점을맞춰상변화메모리 (PCRAM) 의구조및계면저항에따른영향성을전산모사를통해분석하였다. 구조의영향성은 Self-Heating Wall (SHW) 구조와 Self-Heating-Pillar (SHP) 구조를비교하여각구조에따른 current path의비정질화정도가 transition 영역에미치는결과를분석하였다. 또한, 계면저항의영향성은전극과상변화물질 (PCM) 의계면사이의 thermal boundary resistance (TBR) 과 electrical interface resistance (EIR) 을변화시켜가며저항과전류사이의경향성변화에대해분석하였다. 마지막으로이러한분석들을바탕으로더좋은아날로그동작방식을가지는상변화메모리의새로운구조에대해연구해보고자한다. P2-G8-6 Improvement of Peeling for Metal Layer on Anodized Al Surface by Etching 에칭방법을통한 Al 양극산화막과전도층의박리현상개선나사균 *, 이연승. 한밭대학교파워 LED 분야에서가장많이사용되는금속 PCB 구조중에, 방열층으로는금속소재인알루미늄 ( 합금 ) 을사용하고, 그위에알루미늄 (Aluminium) 표면을양극산화 ( 아노다이징 ) 처리하여절연층으로사용하며, 이위에 Ag 페이트로인쇄회로를구성한후, 이인쇄금속층위에무전해도금을통해전도층 ( 니켈보론 (Ni-B) 혹은 Cu 층 ) 을형성한구조가많이활용되고있다. 하지만, 고효율 LED용금속방열기판제조시메탈기판의인쇄금속층 ( 페이스트형금속층 ) 과전도층사이, 또는양극산화알루미늄 (Al 2 O 3 ) 으로이루어진절연층과인쇄금속층에서나타나는스트레스로인한전도층의박리현상이나갈라짐현상이발생되어전도도에불량이발생하게된다. 본연구에서는기존금속방열기판제조시에형성되는양극산화알루미늄 (Al 2 O 3 ) 으로이루어진절연층과 Ag 페이스트인쇄금속층 ( 인쇄회로 ), 그리고이후 Ag 페이스트위에형성되는전도층 (Ni층) 사이의스트레스문제를에칭방법을사용하여해결하고, 양극산화알루미늄표면손상이없도록하였다. 이에칭방법을통하여스트레스로인한절연층과전도층의박리현상이나갈라짐현상을제거하여전도도의불량을개선할수있었다. 전도층으로무전해도금법을이용하여 Ni 층을 Ag 페이스트인쇄회로위에형성하여, 인쇄금속층및양극산화알루미늄표면의에칭효과에따른변화를 Field Emission Scanning Electron Microscope (FE-SEM), Optical microscope (OM) 등을이용하여조사관측하였다. 한국세라믹학회 185

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207 포스터 발표 III 187

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209 포스터발표 III P3-G1-1 Structural Characteristics and Microwave Dielectric Properties of Mg 4 Nb 2-x (M y W 1-y ) x O 9 (M = Al 3+, Zr 4+ ) Ceramics Mg 4 Nb 2-x (M y W 1-y ) x O 9 (M = Al 3+, Zr 4+ ) 세라믹스의구조적특성과마이크로파유전특성김정훈 *, 현무열, 김응수. 경기대학교 With the rapid progress of the wireless communication industry, frequency ranges applicable to electronic systems have expanded remarkably. Mg 4 Nb 2 O 9 ceramics with the corundum structure have received attention as high Qf dielectrics. Dependence of the microwave dielectric properties on the structural characteristics of Mg 4 Nb 2-x (M y W 1-y ) x O 9 (M = Al 3+, Zr 4+, 0.05 x 0.15) ceramics were investigated. For the specimens sintered at 1350 o C at 10 h, a single phase of Mg 4 Nb 2 O 9 with corundum structure was obtained from x = 0.05 to x = 0.1 for M = Al and from x = 0.05 to x = 0.15 for M = Zr, respectively. The structural characteristics of Mg 4 Nb 2-x - (M y W 1-y ) x O 9 ceramics were quantitatively evaluated by Rietveld refinement method. With increasing x, the dielectric constant (K) value of specimens was decrease due to the higher the dielectric polarizability of the Nb 5+ (3.97 Å) than those of substitution ions such as (Zr 1/2 W 1/2 ) 5+ (3.225 Å 3 ) and (Al 1/3 W 1/3 ) 5+ (2.397 Å 3 ). The Qf value was dependent on the average bond valence of the specimens. Effects of the microstructural characteristics on the microwave dielectric properties of the specimens were also discussed. P3-G1-2 The Superconducting Properties of BaHfO3 -doped EuBa 2 Cu 3 O 7-δ Films Fabricated by Pulsed Laser Deposition 펄스레이저증착법을이용하여제조한 BaHfO가도핑된 EuBa 2 Cu 3 O 7-δ 박막의초전도특성박유진 *, 오원재, 유상임. 서울대학교 We report the superconducting properties of BaHfO 3 (BHO)-doped EuBa 2 Cu 3 O 7-δ (EuBCO) films on CeO 2 -buffered MgO (100) single crystal substrates fabricated by Pulsed Laser Deposition (PLD) using the Nd:YAG (λ = 355 nm) pulsed laser. According to previous report, EuBCO is a promising candidate for the next generation superconducting wire since the critical current (I c ) of BHO-doped EuBCO Coated Conductors (CCs) are superior to that of BHO-doped GdBCO CCs with increasing the thickness up to ~ 3.6 μm. However, the effect of BHO dopant on the EuBCO film has never been fully clarified yet. Thus, in this work, we tried to investigate the BHO doping effect on the superconducting properties of the EuBCO films, including the critical temperature, T c and flux pinning properties. Various EuBCO films with x mol % BHO dopant (x = 0, 2.5, 3.5, 5, 7.5 and 10) were fabricated using the EuBCO + BHO mixed target. Samples were characterized by X-ray diffraction (XRD), Field Emission-scanning Electron Microscopy (FE-SEM), R-T measurement system, and Magnetic Property Measurement System (MPMS). Details will be presented for a discussion. This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No ). And Part of this study has been performed using facilities at IBS Center for Correlated Electron Systems, Seoul National University. P3-G1-3 Magnesium doped Indium Oxide Hollow Spheres for Highly Sensitive and Selective Ethanol Gas Sensor 마그네슘이도핑된인듐산화물중공구조를이용한고감도및고선택성에탄올가스센서조영무 1*, 이철순 1, Rui Wang 1, 박준식 2, 이종흔 1. 1 고려대학교, 2 전자부품연구원 Pure In 2 O 3, 0.5 and 1.0 wt% Mg doped In 2 O 3 hollow spheres were prepared by ultrasonic spray pyrolysis of the solution containing In-, Mg-nitrate and sucrose and their gas sensing characteristics toward 5 ppm C 2 H 5 OH, p-xylene, toluene and HCHO were investigated at o C. The 0.5 wt% Mg doped In 2 O 3 hollow spheres showed the highest gas response (R a /R g ; R a : resistance under exposure to the air, R g : resistance under exposure to the gas) to the 5 ppm C 2 H 5 OH (69.4) which was significantly higher than those of pure and 1.0 wt% Mg doped In 2 O 3 hollow spheres (24.4 and 35.7). The enhancement of ethanol response by adding Mg in spite of decrease in the volume of mesopores and specific surface area was attributed to the dehydrogenation reaction of C 2 H 5 OH into reactive CH 3 CHO and H 2 assisted by basic Mg component. P3-G1-4 Effects of Oxygen Partial Pressure on the Properties of ZnO:(Al,Sb) Thin Films Grown by PLD PLD법으로증착한 ZnO:(Al,Sb) 박막의산소분압에따른특성변화구한솔 *, 허영우, 이준형, 김정주. 경북대학교 Ⅱ-Ⅵ 족반도체인 ZnO는 LED, LD와같은광전소자의소재로주목받고있는투명전도산화물중하나이다. Intrinsic defect로 Zn interstitial, O vacancy를가지는 ZnO는기본적으로 n-type conduction을띠게된다. ZnO를이용한소자의성능을향상시키기위해서는 p-type ZnO에대한연구가필요하다. 1족과 5족의원소를도핑하여 p-type ZnO를제작하고있지만, self-compensation과낮은 acceptor solubility로인해안정한 p-type ZnO 제작에는어려움을겪고있다. 본실험에서는 Pulsed Laser Deposition (PLD) 으로 ZnO:Al 0.01 Sb 0.02 박막을제작하였다. acceptor로사용된 Sb의고용량을증가시키기위해 co-doping 법을이용하였으며, O vacancy와관련된 selfcompensation의영향을확인하기위하여 oxygen pressure를변화시키면서박막을증착하였다. c-plane sapphire를기판으로사용하여 500 o C의증착온도에서 oxygen pressure를 mtorr 범위로바꿔가며증착하였다. XRD, SEM, Hall measurement, XPS 등을사용하여박막의구조적, 전기적물성을관찰하였다. ZnO:Al 0.01 Sb 0.02 박막은모든 oxygen pressure에서 30 in-plane rotation을한상태로주로 (0002) preferred orientation으로성장하였다. Hall measurement를이용하여전기적특성을측정한결과, 1-60 mtorr의 oxygen pressure에서는 n-type conduction을나타냈으나 100 mtorr 이상의 oxygen pressure에서는 p-type conduction 을나타냈다. XPS를이용하여 Sb의 bonding state를관찰해보았을때, n-type conduction을나타내는 1 mtorr 에서는 Sb 3+ 가, p-type conduction을나타내는 200, 500 mtorr에서는 Sb 5+ 가더우세한것을볼수있었다. P3-G1-5 Effect of Sintering Temperature and Oxygen Partial Pressure on Evaporation and Densification of In-Sn-Zn-O Transparent Conductive Ceramics 소결온도및산소분압이 In-Sn-Zn-O 투명전도성세라믹스의휘발및치밀화에미치는영향김도겸 *, 김명언, 이도윤, 허영우, 김정주, 이준형. 경북대학교 한국세라믹학회 189

210 2017 년한국세라믹학회추계연구발표회 최근 flexible 및 wearable 전자기기의급속한발전과관심으로인해더높은수준의 flexible 디스플레이패널이요구되고있다. Indium tin oxide (ITO) 투명전극이일반적으로디스플레이패널에널리사용되어왔지만, 기판이휘어질때결정질필름에균열이발생하기쉽다는단점이있다. 이러한관점에서, ITO 보다더쉽게비정질투명전도성필름의구현이가능한 In-Sn-Zn-O (ITZO) 계등의다성분계소재에대한연구가활발히진행되고있다. 스퍼터링을위한타겟의조건으로는고밀도및작은입자크기를들수있으며, 특히 ITZO 와같은다성분계타겟은 In:Sn:Zn 의성분비가정밀하게유지되어야한다. 그러나 In 2 O 3, SnO 2, ZnO 모두증기압이높아고온소결시쉽게휘발한다는문제점이있으며이로인하여소결후출발조성과성분비가달라질수있다. 본연구에서는소결온도와산소분압이 ITZO 의소결시발생되는휘발, 치밀화및상합성에미치는영향을분석하였다. ITZO 성형체는하소과정없이 o C 온도범위에서 2 시간반응소결하였다. 이때소결분위기는공기및산소 (PO2=1 기압 ) 로각각조절하였다. 소결된샘플의상 (phase) 은 X-ray diffraction (XRD) 를이용하여조사하였으며, 소결후휘발정도는시편의표면에서내부방향으로 Electron Probe Micro Analyzer (EPMA) 조성분석을시행하였다. Thermogravimetric Analysis (TGA) 분석을통하여성분의휘발시작온도및휘발량을조사하였다. 분석결과산소분위기는전반적인휘발을상당히억제하며, 본실험 (ITZO) 의경우 ZnO 의휘발이가장심한것으로확인되어소결공정인자조절및출발조성조절등이필요할것으로생각된다. 아울러소결한샘플의밀도, 입자크기등미세구조에대한분석도이루어졌다. P3-G1-6 Flexible Durability of Transparent Electrodes deposited by Aerosol Deposition Process by Aerosol Deposition Method AD공정으로성막한투명전극박막의유연내구성연구이동원 1*, 조명연 2, 이상헌 1, 김용남 1, 오종민 2. 1 한국산업기술시험원, 2 광운대학교현재전자기기들은과학기술이급속도로발달해가면서점점소형화, 경량화가되어가고있으며, 혁신적인디자인과공간활용을가능하기위해서는유연성을갖춘기기들이또한요구되고있다. 유연한전자기기를제작하기위해서는투명하면서유연성을갖는전극과 PET (polyethylene terephthalate) 등과같은유연성을가진기판을사용해야한다. ZnO, AZO, ITO 등은투명전극소재로많은각광을받고있으며많은연구자들에의해서전기적인성질, 광학적인성질에대한연구가진행이되어왔다. 그러나투명전극소재의내구성연구는아직도많이부족한것이현실이다. 따라서본연구에서는 PET 기판에 ZnO, AZO 등과같은투명전극을성막하여굽힘시험및피로시험을통하여전극의내구성연구를중점적으로진행하였으며, 이를위한코팅공정으로상온고속코팅이가능한 aerosol deposition (AD) process를응용하였다. 또한, AD 공정으로성막된투명전극의신뢰성을평가하기위해내환경및내화학시험을진행하였다. P3-G1-7 Inducing Multiferroic Properties in Psudo-cubic Nickel Ferrite through a Forced Oxygen Deficiency 산소결핍으로인한의사입방정구조인니켈페라이트에서의다강체특성유도조재현 1*, Haribabu Palneedi 2, Annapureddy Venkateswarlu 2, 류정호 2, 조욱 1. 1 울산과학기술원, 2 재료연구소 It is noticed that multiferroic properties can be derived structural transition and ordering of spin or charge. Given this, we attempted to achieve the realization of magnetoelectric properties in psudo-cubic structured NFO by forced oxygen vacancies at a fundamental level. Here, we show not only that the magnetic moment is improved by this intentional treatment but also that these oxygen-deficient nickel ferrite systems with metrically cubic structure have a meaningful magnetoelectric effect (ME) at room temperature, indicative of a multiferroicity induced possibly due to a localized non-cubic distortion. As well, we found that the appearance of ME coupling is not solely due to the increasing localized non-cubic distortion in that there exists an optimal composition, i.e., NiFe 1.6 O 3.4, beyond which both ME coupling and saturation magnetization value are deteriorated. Please note that these oxygen-deficient nickel ferrite systems belong to an inverse cubic spinel structure, where piezoelectricity must be, in principle, absent. Given that the magnetoelectric effect is a phenomenon bridging magnetic and electrical properties, these oxygen-deficient nickel ferrite systems can be referred to as a multiferroic, a possible origin of which may lie at a highly localized scale. P3-G1-8 Study on Thermal Stability and Mechanical Properties of Al 2 O 3 /PVDF-HFP Composite Separator for Lithium-ion Batteries Al 2 O 3 코팅유 / 무기복합분리막의열안정성및기계적물성에대한연구이상헌 *, 이동원, 김진용, 정재범, 김용남. 한국산업기술시험원최근전기, 전자산업이급속히발전함에따라이러한분야에사용되는소형화, 경량화, 고성능화가가능한리튬이차전지의중요성이높아지고있다. 이에따라이차전지의안정성에중요한역할을담당하는핵심부품인분리막에대한관심도가크게증가되고있다. 이차전지에사용되는분리막은충전과방전이가능한이차전지의핵심소재로양극과음극이접촉해단락되는것을방지한다. 기존에는이러한조건들에적합한재료들로폴리올레핀계열분리막들이사용되었으나최근에는열적안전성과기계적안전성을개선하기위해서세라믹복합분리막이이차전지의분리막재료로연구되고있다. 분리막코팅소재로서는알루미나가대표적으로이용되고있으며초미분이면서고순도의알루미나분말이우수한특성을나타내고있다. 본연구에서는입자크기및형상이다른알루미나파우더를딥코팅방식을이용하여 PE 양면에코팅하였고코팅분리막에대한물성평가를진행하였다. 또한코팅분리막두께에따른열적, 기계적안정성에대한평가도진행하였다. P3-G1-9 The Mechanism of Piezoelectric Properties in Mnmodified 0.67Bi 1.05 FeO BaTiO 3 Ceramics 김다정 1*, 이명환 1, 송태권 1, 김명호 1, 도달현 2. 1 창원대학교, 2 계명대학교 Manganese ions have diverse valence states, such Mn 2+, Mn 3+, and Mn 4+. Mn-modified lead-free ceramics have a significant influen ce on their electrical properties and sintering behavior due to different defects with oxygen vacancies. One of lead-free piezoceramics in BiFeO 3 - BaTiO 3 system, there is mainly focused on their relevant piezoelectric and electromechanical properties as well as their relatively high Curie temperature. Most published reports depend on the reduction of defects in dopant-modified BiFeO 3 - BaTiO 3 ceramics. 190 한국세라믹학회

211 포스터발표 III In this poster, we investigated on the formation of the defects are in Mn-modified 0.67Bi 1.05 FeO BaTiO 3 ceramics sintered in the furnace-cooling and water-quenching process. As a result, lowvalence MnO sample have high performance piezoelectric constant (d 33 = 331 pc/n, d 33 * = 257 pm/v) and total strain (S max + S neg = S total ) is 0.36%. P3-G1-10 Effect of Dispersion and Carbon Addition on Microstructure of Alumina Sintered Body 분산및탄소첨가가알루미나소결체의미세구조에미치는영향유창민 1*, 이창현 2, 신효순 1, 여동훈 1, 김성훈 3. 1 한국세라믹기술원, 2 고려대학교, 3 신라대학교반도체와디스플레이제조장비에서판재형상을갖는고신뢰성알루미나구조세라믹을주로사용하는데, 이는이는알루미나구조세라믹의우수한기계적신뢰성과균질성뿐만아니라 μm 수준의정밀도와다양한형상을구현할수있다는장점때문이다. 최근디스플레이의대형화추세에따라이를제조하기위한알루미나구조세라믹의대형화역시필수불가결하게되었다. 이러한대형알루미나제조기술의경우소재의특성과더불어이를정밀하고쉽게가공할수있는가공성의확보또한매우중요한소재특성중하나이며, 이를위해미세구조를제어할필요성이존재한다. 따라서본연구에서는슬러리분산및탄소첨가가알루미나소결체의미세구조에미치는영향을검증하고자하였다. 우선수계분산제인 BYK-012, 194 등여러종류의분산제에대하여알루미나와분산제의적합성실험을진행하였으며분산제의양과 ph 를조절함으로써최적의분산조건을확인하였다. 그후가공성향상을위하여슬러리에탄소를첨가함으로써소결체의기공크기와분포에주는영향을검토하고자하였다. 이렇게제조된슬러리는 ''filter casting'' 방식을이용해성형체로제조하였고소결한후 SEM을이용하여미세구조를확인하였다. P3-G1-11 Effects of Glass Formation on Mechanical and Thermal Properties of Cordierite-mullite Ceramics 글래스형성이코디어라이트-뮬라이트세라믹의기계적열적특성에미치는영향김시연 1*, 임진현 1, 신효순 1, 여동훈 1, 윤호규 2. 1 한국세라믹기술원, 2 고려대학교 LCD, OLED 설비및태양광셀웨이퍼건조및소성공정에 IR히터, 할로겐램프히터가주로사용되고있다. 이들램프들은가열되는동안미세먼지입자. 설치공간제약, 잦은교체등의문제점을가지고있다. 이러한문제점을개선하고자적층형히터적용에대한요구가높아지고있다. 이러한적층형세라믹히터소재로 Mullite는 alumina silica계화합물로우수한열적특성과저열팽창특성을나타내고있다. 그러나소결온도가너무높기때문에세라믹히터로적용되기어렵다. 소결온도를낮추기위해서 MgO, Y 2 O 3 를소결조제로첨가하고, 열충격내성을증진시키고자코디어라이트를첨가하였다. 그결과 1300~1400도에서소결체를얻었으며 3 점곡강도가 200 MPa 이상, 열팽창계수는 3 ppm/ C가측정되었다. P3-G1-12 Low Temperature Sintering and Mechanical Properties of Mullite Ceramics 뮬라이트세라믹스의저온소결및기계적물성임진현 1*, 김시연 2, 여동훈 2, 신효순 2, 정대용 3. 1 한국세라믹기술원이천분원, 2 한국세라믹기술원, 3 인하대학교 뮬라이트 (3Al 2 O 3-2SiO 2 ) 는높은내침식성과내화학성, 우수한열안정성과기계적성질, 크리프저항성등으로인하여고온구조재료로널리사용되어왔다. 특히 Si 와유사한열팽창계수특성으로인하여프로브카드기판소재로적용하기위한연구가활발히진행되고있다. 그러나순수뮬라이트는 o C 의높은소결온도와기판소재로사용하기에부족한강도특성으로인하여적용에어려움을겪고있다. 따라서본연구에서는 Y 2 O 3, MgO, Cr 2 O 3 를첨가제로선정하여 o C 에서 2 시간소결하여소결특성을확인하였다. 그결과, 1350 o C 에서뮬라이트에 4wt% 의 Y 2 O 3, 2 wt% 의 MgO, 2 wt% 의 Cr 2 O 3 를첨가한조성의소결밀도가 3.23 g/cm 3, 3 점곡강도는 275 MPa, o C 영역에서의열팽창계수는 3.87 ppm/ o C 로측정되었다. P3-G1-13 Manufacture of High Strength Substrate for Chip Type Supercapacitor Package Chip Type Supercapacitor Package용고강도세라믹기판제이창현 1*, 신효순 2, 여동훈 2, 김효태 2, 남산 1. 1 고려대학교, 2 한국세라믹기술원 Chip type supercapacitor용기판으로사용되는세라믹소재의기판은높은강도특성및절연특성을요구하며, 평탄도및전극과의접착력이우수해야한다. 이러한세라믹소재기판을제조하기위하여후막공정인 Tape casting 법으로세라믹 sheet를제조후적층및소결한다. Tape casting법을적용하기위해서는세라믹파우더, 용매, 분산제, 바인더, 가소제등여러종류의복합혼합물인세라믹슬러리를제조해야한다. 이때슬러리는최적화된슬러리조성을설계할필요가있다. 이러한방법으로제조한세라믹 sheet를 Chip type supercapacitor의기판으로적용하기위해서 punching 및전극 printing 공정에서매우높은정밀도를요구한다. 하지만세라믹기판소재의소결시나타나는수축오차들이기판의 dimension과휨현상등에영향을미친다. 따라서본연구에서는알루미나, 지르코니아조성을기반으로하는 green sheet의슬러리조성최적화와 punching 및소결최적화를통하여 Chip type supercapacitor용 package 기판제조공정을최적화하고자하였다. 제작된기판은광학현미경을이용하여정밀도를관찰하였으며, SEM을이용하여미세구조를확인하였다. 이결과를이용하여 Chip type supercapacitor에고강도세라믹기판적용을위한최적화된공정을제시하고자하였다. P3-G1-14 The Study on the Melting Point Decrease and the Resistance Change of Low Melting-point Ag Paste for Heatable Glass Caused by Addition of Nano-Ag Powders 발열유리용저융점 Ag paste의 nano-ag 첨가에따른융점강하및저항변화에대한연구김태훈 1*, 장세홍 1, 박성대 1, 강윤찬 2. 1 전자부품연구원, 2 고려대학교자동차의전장화추세에따라발열윈드쉴드 (windshield) 에대한요구가높아지고있다. 최근발열유리용 Ag paste는 Pb free 이슈를해결하기위해낮은융점의 Ag paste가필요하게되었다. 그러나현재사용되는 Ag paste는수마이크론크기의 Ag powder 또는 Ag flake를사용하여소성을위해 600 o C 이상의고온이필요하다. 이를해결하기위해 nano-ag를사용함에따라, 융점강하효과및이에따른전극과발열전도막의계면저항감소를기대할수있다. 본연구에서는 Ag flake의함량을줄이고 spherical한 nano Ag powder를늘린 Ag paste를제조하였다. 제조된페이스트는 DSC 를이용하여융점의변화여부를확인하였다. 또한 low-e 유리위에스크린프린트로도포한후, 열처리를진행하여 nano-ag 함량 한국세라믹학회 191

212 2017 년한국세라믹학회추계연구발표회 에따른저항변화를확인하였으며, 이러한변화가발열유리의발열특성에미치는영향을관찰하고자하였다. P3-G1-16 Electrical Properties and in-situ Temperature Stability of (Bi, Na, K, Li)TiO 3 Piezoceramics (Bi, Na, K, Li)TiO 3 압전세라믹의전기적특성및온도안정성이경자 *, 김병훈, 양선아, 이민구. 한국원자력연구원 The dielectric, piezoelectric and ferroelectric properties of 0.76(Bi 0.5 Na 0.5 )TiO (Bi 0.5 Li 0.5 )TiO 3-0.2(Bi 0.5 K 0.5 )TiO 3 ceramics were investigated to clarify the optimal sintering temperature and the vibration characteristics were examined for a compression-mode accelerometer assembly in which (Bi,Na)TiO 3 -based ceramics sintered at the optimized temperature served as the piezoelectric elements. The increase in the grain size of the (Bi,Na)TiO 3 -based ceramics with the sintering temperature provides a beneficial contribution to the piezoelectric coefficient; however, it detrimentally contributes to the depolarization temperature. The temperaturedependent charge sensitivity of the accelerometer was governed by the small-signal piezoelectric coefficient d 33 rather than by the largesignal piezoelectric coefficient d * 33 of the (Bi,Na)TiO 3 -based ceramics. The significant decrease in the charge sensitivity in the vicinity of the depolarization temperature is closely related to the main intrinsic contribution to the piezoelectricity, i.e., the decrease in the crystal anisotropy associated with the temperature-induced polar ferroelectric-nonpolar relaxor phase transition. P3-G1-17 The Effects of Additive and Sintering Atmosphere on the Sintering and the Properties of PZT Ceramics 첨가제와소결분위기가 PZT 세라믹스의소결및압전특성에미치는영향최정식 1*, 이창현 2, 신효순 1, 여동훈 1, 이준형 3. 1 한국세라믹기술원, 2 고려대학교, 3 경북대학교 MLCC(Multilayer ceramic capacitor) 와 MLCA(Mlutilayer ceramic actuator) 등의다양한분야에서저온소결은비용절감등의여러가지장점을지니고있다. 특히 Pb계열압전세라믹스의경우소결온도가 950도이하일경우, 원가가상대적으로낮은 Cu paste 를전극으로이용할수있다는장점이있다. 하지만이러한 paste 를사용하게될경우, 산화방지를위하여환원분위기에서소결하여야하며이러한환원분위기는 paste외에도 Pb계열세라믹스의압전특성에도영향을미친다. 산화분위기에서소결하는경우 perovskite(abo3) 구조에서 A-site에공공이생성되어비유전율, KP 그리고 d33 등이증가하게되며, 환원분위기에서소결하는경우 O자리에공공이생성이되어 Qm 등이증가하게된다. 즉산화분위기에서는 donor, 환원분위기에서는 acceptor로작용수있다. 따라서본연구에서는 Cu paste를적용한 Pb계열의압전세라믹스를제조하여저온소결및소결분위기에따른압전특성변화와첨가제의종류에따른압전특성변화에대해연구를진행하였다. 소결온도는 950 o C에서진행하였으며, 이때산소분압을조절하여환원분위기를제어하였다. 이에따라첨가제의종류가 d33, KP, Qm 등의압전특성에미치는영향을비교분석하였다. P3-G1-18 Electric-field-induced Properties and Electrocaloric Effects of B-site Ordered/disordered PST Relaxor PST 완화형강유전체의 B-site 이온배열변화에따른전계유기특성및전기열량효과변화 홍창효 1*, Romain Faye 2, Torsten Granzow 2, Emmanuel Defay 2, Ke Wang 3, 조욱 1. 1 울산과학기술원 (UNIST), 2 Luxembourg Institute of Science and Technology, 3 Tsinghua University B-site cations (Sc 3+, Ta 5+ ) in Pb(Sc 1/2 Ta 1/2 )O 3 (PST) ceramic can be ordered and/or disordered by different thermal treatments after sintering. When PST annealed at a suitable temperature for an appropriate period, the B-site cations become ordered (PST-O), which behaves like ferroelectrics. However, when the PST is quenched from a certain temperature far above the sintering temperature, the B-site cations can remain disordered (PST-D) at room temperature, which behaves like canonical relaxor ferroelectrics. The degree of B-site ordering was calculated from the ratio of the intensities between the superlattice reflection (111) and the adjacent lattice reflection (200) based on an X-ray diffraction technique. The electric-field-induced properties and dielectric properties of PST-O and PST-D were investigated at various temperatures ranging from -70 to 150 o C, with reference to their dielectric permittivity maxima, where most phenomena characterizing ferroelectrics and relaxor ferroelectrics take place. As we expected, PST-O and PST-D showed typical polarization hysteresis, strain and switching current curves of the ferroelectrics and the relaxor s respectively. Besides, PST-O shows the high electrocaloric effect as T = -1.8 K at RT. P3-G1-19 Ferroelectric-based Synaptic Devices with Oxide Heterostructure 강유전체산화물이종접합기반의시냅스소자이준봉 1*, 최택집 1, 김윤석 2, 이호진 1, 윤여균 1. 1 세종대학교, 2 성균관대학교 Ferroelectric polarization related charge transport have been utilized for novel electronic devices, such as ferroelectric tunnel junction, switchable diode, and ferroelectric memristor. Recently, ferroelectricbased oxide heterostructure has been proposed for synapse device that exhibits a high on/off ratio, low power consumption and short process time. In ferroelectric-based synapse devices, gradual electroresistive modulation is associated with change of ferroelectric domain configuration, providing the controllability of the electric conductance for the effective operation of synapse devices. In this work, we fabricated a ferroelectric-field-effect transistor based synapse devices with channel layer of metal to semiconducting transition (MST) oxide. Ferroelectric polarization reversal can control the amount of applied energy to MST oxide phase transition and channel conductance at the same time. Our ferroelectric heterostructure with analog-like electroresistive modulation is highly desirable for realizing a new synapse device. P3-G1-20 Structural and Optical Properties of CaGd 2 ZrSc(AlO 4 ) 3 : Ce 3+ Garnet Structure Phosphor for White LED Applications Garnet 구조형광체의구조적광학적특성. 김하준 *, 임종찬, 김윤화, 임원빈. 전남대학교 Single-phase yellow phosphor, CaGd 2-x ZrSc(AlO 4 ) 3 :xce 3+ (CGZSA: Ce 3+ ), possessing cubic symmetry with varied Ce 3+ concentrations was synthesized using the solid-state reaction method. The samples were characterized using X-ray diffraction (XRD), excitation spectra, emission spectra, thermal quenching, and decay curves. The cubic phase of CGZSA:Ce 3+ phosphor was confirmed via XRD analysis. 192 한국세라믹학회

213 포스터발표 III The photoluminescence spectra of CGZSA:Ce 3+ phosphor demonstrated that the phosphor could be excited at the wavelength of 440 nm and a broad yellow emission band was centered at 541 nm. These results indicate that the phosphors are adequately excited by blue light and have the potential to function as a yellow-emitting phosphor for applications in white light-emitting diodes. P3-G1-21 Nano Encapsulation of K 2 SiF 6 :Mn Phosphor for Moisture-Stable Light-emitting Devices 발광소자용형광체의수분안정화를위한 Nano-encapsulation Paulraj Arun Kumar *, 임원빈. Chonnam National University A moisture-stable, red-emitting fluoride phosphor with an organic hydrophobic skin is reported. A simple strategy was employed to form a metal-free, organic, passivating skin using oleic acid (OA) as a hydrophobic encapsulant via solvothermal treatment. Unlike other phosphor coatings that suffer from initial efficiency loss, the OApassivated K 2 SiF 6 :Mn 4+ (KSF-OA) phosphor exhibited the unique property of stable emission efficiency. Control of thickness and a highly transparent passivating layer helped to retain the emission efficiency of the material after encapsulation. A moisture-stable KSF- OA phosphor could be synthesized because of the exceptionally hydrophobic nature of OA and the formation of hydrogen bonds (F H) resulting from the strong interactions between the fluorine in KSF and hydrogen in OA. The KSF-OA phosphor exhibited excellent moisture stability and maintained 85% of its emission intensity even after 450 h at high temperature (85 C) and humidity (85%). White light-emitting devices were fabricated using surface-passivated KSF and Y 3 Al 5 O 12 :Ce 3+ which exhibited excellent color rendering index of 86, under blue LED excitation. P3-G1-22 Bending Flexibility Evaluation of Cu Layer-Intervened ZnO:Al Thin Films 구리층이삽입된 ZnO:Al 박막의굽힘유연성평가김승원 *, 최홍제, 김다빈, 조용수. 연세대학교 This work introduces the mechanical fracture behavior of one of the typical TCO (transparent conducting oxide) thin films, i.e., Al-doped ZnO (AZO) thin films here, under an extended range of bending conditions when a Cu buffer layer is intervened between the film and a polyethersulfone (PES) substrate. So far, metal interlayer approach has been reported mainly to improve the electrical conduction of the TCO thin films. However, the bending fracture behavior of the metalintervened TCO structure has not been introduced. This study is the first one examining the effect of the buffered metal layer on the fracture resistance under flexible condition, on the basis of quantitative evaluation of mechanical parameters including fracture energy, film strength and fracture toughness. As the best example, a 20 nm-thick Cu layer resulted in a ~37.1% improvement in the fracture resistance, which means that we can bend further the TCO films without generating cracks. The estimated high values of fracture energy ~224.7 Jm -2, film strength ~196.9 MPa and fracture toughness ~5.8 MPa m 1/2 support well the substantial enhancements in bending fracture resistance. P3-G1-23 Dielectric Properties and Grain Boundary Potentials of Ag/Zn/Mn/Ga-Doped CaCu 3 Ti 4 O 12 Thin Films 은 / 아연 / 망간 / 갈륨이도핑된 CCTO 박막의결정립계퍼텐셜과유전특성조아라 *, 김지원, 한찬수, 오효찬, 조용수. 연세대학교 CaCu 3 Ti 4 O 12 has been recognized as one of the rare materials having a very large dielectric constant due to its intrinsic interfacial polarization, in which the electrical state of grain boundary determines the magnitudes of induced dipoles. Here, the grain boundary potential and relative permittivity are investigated for the CaCu 3 Ti 4 O 12 thin films doped with Zn, Ga, Mn and Ag, which are processed by a solution deposition technique. It was found that grain boundary potential is related to the level of dielectric constant. This effect is attributed to the increased charge accumulation near the grain boundary, depending on the choice of dopant. As the best example, 1 mol% Ag-doped CaCu 3 Ti 4 O 12 thin films demonstrate the best relative permittivity, compared to pure and other-doping cases, as associated with a higher grain boundary potential of mv compared to 82.6 mv for the reference film. P3-G1-24 Effect of Excess MgO Content on Microwave Dielectric Properties of Mg x Ti 0.9 (Zn 1/3 Ta 2/3 ) 0.1 O 3 (1 x 1.075) Ceramics Mg x Ti 0.9 (Zn 1/3 Ta 2/3 ) 0.1 O 3 (1 x 1.075) 의마이크로파유전특성에미치는 MgO 과다함량의영향김재민 *, 김응수. 경기대학교 The dependence of microwave dielectric properties on the MgO content of Mg x Ti 0.9 (Zn 1/3 Ta 2/3 ) 0.1 O 3 (1 x 1.075)ceramics were investigated. High quality factor (Qf ) MgTiO 3 -based ceramics can be obtained by eliminating secondary phases. Single phase of MgTi 0.9 (Zn 1/3 Ta 2/3 ) 0.1 O 3 was observed for the specimens with x = to x = MgTi 2 O 5 was detected at x = 1.0, while MgO was observed at x = as secondary phases along with the main phase of MgTi 0.9 (Zn 1/3 Ta 2/3 ) 0.1 O 3. The Qf value of the specimens increased from x = 1 to x = and then decreased. The highest Qf value (244,000 GHz) of the specimens was observed at Mg Ti (Zn 1/3 Ta 2/3 ) 0.1 O 3. Dielectric constant (K) shows a similar tendency to Qf value. The relationship between the microstructure and microwave dielectric properties of the specimens was also discussed. P3-G1-25 Surface Modification of Zinc Oxide Nanoparticle by Grafting-to Method and Fabrication of ZnO Nanocomposite Grafting-to 방법을이용한 ZnO의표면개질및유무기복합체의제조정혜진 *, 박성대, 양현승. 전자부품연구원 ZnO는화합물반도체로그간압전체, 화장품, 백색안료등에사용되었으나, 고품위단결정및박막성장기술이진행되면서주목받고있다. 자외선차단, 적외선흡수, 열전도성, 항균성및내마모성등의특성을이용해서바닥타일, 플라스틱, 코팅, 등에폭넓게사용되어왔다. 이와같은 ZnO의장점을이용하고자, 유기소재에 ZnO를복합하는연구가진행중이다. 특히, ZnO의특성을극대화하기위해서, 유기소재내 ZnO의분산성을다양한방법으로향상시킨연구결과가있다. 기존에는 ZnO의표면을실란화합물을이용한표면개질을통해서분산성을향상시킨연구결과가많이있다. 본연구에서는 grafting-to 방법을이용하여 ZnO 표면에 Isophorone diisocyanate (IPDI) 로처리한후, Hexadecylamine (HDA) 등을도입하는실험을진행하였다. 표면개질유무는 BET 한국세라믹학회 193

214 2017 년한국세라믹학회추계연구발표회 와 FT-IR, TGA-DSC 등으로분석하였으며, 이를유기용매및유기소재내에서의분산특성을 Turbiscan 으로확인하였다. P3-G1-26 Ultrafine 3D-stacked Sensor Architecture for Multigas Detection 멀티가스감지를위한초소형 3D 적층형센서구조박태완 *, 최영중, 백종후, 조정호, 박운익. 한국세라믹기술원 Hierarchical 3-dimensional (3D) nanofabrication has become necessary for future device applications such as sensors, memories, energy generators, and optical devices. Among many kinds of nanofabrication methods, pattern-transfer printing has garnered much attention due to its process simplicity, cost effectiveness, and pattern resolution to produce functional nanoscale materials. However, there are still remaining challenges to be resolved to realize more facile and rapid formation of multi-functional arrays for next-generation device applications. In this study, we introduce a simple and practical nanotechnology to generate hierarchical 3D multi-material nanoscale & microscale (sub-20 nm & sub-10 um) arrays composed of various metals or metal oxides by shadowing and depositing replica patterns obtained from a master mold. In addition, we demonstrate how to easily fabricate a nanoporous (size: nm 2 ) multi-sensor arrays for the detection of four harmful gases by one-step pattern-transfer printing of four sensing materials on replica patterns. This useful approach would be extendable to the other nano-patterning method based on the pattern-transfer printing and material systems for other future device applications. P3-G1-27 Structural and Piezoelectric 0.77Bi 0.5 Na 0.5 TiO SrTiO 3 Lead-free Piezoceramics 0.77Bi 0.5 Na 0.5 TiO SrTiO 3 무연압전세라믹스의구조적및압전특성정승재 *, 김성원, 윤지선, 정영훈, 박운익, 백종후, 홍연우, 조정호. 한국세라믹기술원 The Bi 0.5 Na 0.5 TiO 3 -SrTiO 3 ceramics represent giant strain properties above the specific driving electric field. This phenomenon is due to the coexistence of ferroelectric phase and ergodic relaxer phase formed by inhomogeneous diffusion of SrTiO 3 to Bi 0.5 Na 0.5 TiO 3. Until now, numerous researches have been performed to reduce the driving electric field or to increase strain. In this study, 0.77Bi 0.5 Na 0.5 TiO SrTiO 3 (0.77BNT-0.23ST) piezoceramics were synthesized by the solid state reaction method and the modified columbite method. A single phase with perovskite structure of 0.77BNT-0.23ST was confirmed by X-ray diffraction analysis. Piezoelectric properties characterized by ferroelectric hysteresis loop and strain curve were investigated. Domain and core-shell structures observed by TEM analysis were also discussed. P3-G1-28 Multiferroic Property of Samarium doped BiFeO 3 Ceramics at Morphotropic Phase Boundary 사마륨이첨가된비스무스페라이트의상공존영역에서다강체특성분석최해인 *, 이명환, 김다정, 김명호, 김원정, 송태권. 창원대학교 The bismuth ferrite (BiFeO 3, BFO) is a room-temperature multiferroic material with high Curie temperature (1100 K) and high Neel temperature (653 K). Base on the multiferroic order of BFO system, it will be applied to multi-function sensor devices. However, pure BFO system cannot be approached to single phase due to the bismuth volatility and valence electron state transition of iron. It is a hinder to measure the electronic property due to the high leakage current. To measure the multiferroic property of BFO system, solid solution with rare-earth orthoferrite is the way to improve of the ferroelectric and magnetic properties. In a specific selected of solid solution, SmFeO 3 (SFO) with BFO system is improved the multiferroic property near the morphotropic phase boundary (Bi 0.86 Sm 0.14 FeO 3 ). In this study, Bi 0.86 Sm 0.14 FeO 3 ceramics are studied with different sintering method; water-quenching (WQ), air-quenching (Q) and furnace-cooling (FC). The phase and structure are observed rhombohedrally distorted perovskite structure with orthorhombic phase. The ferroelectric remnant polarization observed with 20 μc/cm 2, 17 μc/cm 2 and 15 μc/ cm 2 from WQ, Q and FC. Temperature-dependent dielectric constant is observed the ferroelectric to paraelectric transition temperature at 450 o C from WQ. Other detail information will be present in poster. P3-G1-29 Investigation into the Lithium Electrochemical Behavior of Sn/Sb Alloys 주석 / 안티모니합금의리튬전기화학거동에관한연구원창민 *, 김대경, 이혁재. 안동대학교과학기술의발전으로전자기기들의사용량이많아지면서배터리는전자기기들의전원으로사용되어없어서는안될중요한물품이되었다. 현재배터리는최고의에너지밀도와높은사이클수명을지니고있는리튬이온배터리를통상적으로사용하고있다. 본연구의목적은높은이론용량을지니고있는 Tin과좋은사이클특성을지닌 Antimony의기계화학적방법을통해합금화하여비율에따른전기적특성을비교및분석하는것이다. 비율에따른분말들의특성평가를위해 XRD, SEM, PSA 분석과 type Coin Cell을제작하여전기화학적거동을알아보았다. Tin의함량이많을수록초기용량은높은편이지만사이클특성이떨어진다. 하지만 Antimony의함량이많아질수록사이클특성이우수해지는것을보여준다. Sn 9 : Sb 1의비율부터 Sn 3 : Sb 7의비율까지합성된분말들중에서 Sn 4 : Sb 6의분말이가장우수한 capacity 및 Cycle performance가얻어졌다. P3-G2-1 Electrochemical Characterization of Manganese Oxide Nanofibers Prepared by Electrospinning 전기방사로제작된망간산화물나노섬유의전기화학적특성평가한진주 1*, 정중훈 1, 송찬근 2, 윤형중 2, 원종한 2, 윤종원 1. 1 단국대학교, 2 한국기초과학지원연구원전극의산화환원반응을이용해전하를축적하는슈퍼캐패시터 (supercapacitor) 의경우금속산화물중전기화학적특성이우수한 RuO 2 *H 2 O에대한연구가많이이루어지고있으나, 원료의원가가높아상용화에제한적이다. 따라서원가가낮고자원이풍부한금속산화물인 MnO x 는환경친화적재료로리튬이온배터리등에서효율적인전극재료로많은연구가이루어지고있다. 본실험에서는 1차원나노구조체를비교적간단히제작하는방법인전기방사법을활용하여망간산화물 1차원나노와이어를제작하고열처리온도에따른망간산화물의결정구조, 미세구조및화학양론조성평가를수행하고, 열처리온도에따른망간산화물을슈퍼캐패시터의적용가능성을검토하고자전기화학적특성평가인순환전류전압 (CV) 측정및임피던스측정, 직류충방전 (GCD) 특성평가를수행하였다. X선회절분석을이용하여망간산화물결정구조 194 한국세라믹학회

215 포스터발표 III 를분석한결과 400 o C 로열처리된망간산화물의경우 Mn 2 O 3 와 Mn 5 O 8 의혼상이었고, 600 o C 열처리시료의경우 Mn 2 O 3 단일상으로확인하였으며, FESEM 을통한미세구조분석결과나노와이어의평균직경은 200~300 nm 로확인되었다. 제작된망간산화물을니켈폼에캐스팅한작용전극을 1 mol KOH 전해질용액속에서 CV 측정결과전기용량값으로 F/g 을나타내었으며 600 o C 열처리한시료의경우 F/g 을나타내었다. 본발표에서는망간산화물의열처리온도에따른전기용량값의차이를결정구조, 미세구조및화학양론적분석의결과를기반으로발표하고자한다. P3-G2-2 Determining Degradation Mechanisms of Solid Oxide Fuel Cells under Diverse Current Cycling Conditions SOFC의다양한부하변동조건에서의내구성평가및열화메커니즘분석김유동 *, 박가영, 박준영. 세종대학교 Solid oxide fuel cells (SOFCs) have big potential to change from the current fossil fuel-based energy to the clean and sustainable hydrogen fuel infrastructure. However, various operating conditions, such as load cycling, gas atmosphere, and temperature distribution, result in decreasing the operational stability of SOFCs. It has been reported that the long-term durability of SOFCs is dependent on the operating conditions. Thus, it is of significance to analyze main degradation mechanisms under a variety of operating conditions. The degradation of the cell originates from the deterioration of each cell component and the interactions between the cell components such as agglomeration of nickel particles and mechanical failure of electrolyte. In this research, the Ni-cermet anode-supported yttria-stabilized zirconia electrolyte cell is fabricated and tested at 700 o C with humidified hydrogen (3% H 2 O) and ambient air. The diverse operating logics are applied for the long-term durability tests such as load trip, load cycle, and constant current. The load trip is repeated current density from 0 to 200 ma/cm 2 for 12 h at 700 o C. The load cycle is applied to cell with different current density which are 120 and 200 ma/cm 2 on every 12 h at 700 o C. The electrochemical analysis of cells are performed using electrochemical impedance spectroscopy and microstructure analysis of degraded cell is also carried out using a field emission-scanning electron microscopy. P3-G2-4 Crystallization and Fabrication of High Purity CaCO 3 Powder from Waste Seashells 버려진폐패각으로부터고순도 CaCO 3 분말제조와결정화이연승 *, 박정호, 신상모. 한밭대학교탄산칼슘 (CaCO 3 ) 은일반적으로고무, 플라스틱, 도료, 시멘트, 제지의충진제및코팅제, 페인트, 식품및의약품, 그리고인쇄잉크등등의다양한분야에이용되면서그수요가매우큼에따라, 매년백만톤이상이전세계적으로생산된다고한다. 일반적으로, 고순도탄산칼슘분말은채광된석회암을소성하여제조된다. 이제조과정에서대개 800 o C 이상의고온에서이루어지는소성과정때문에 CO 2 가스가대기중으로방출되게된다. 전세계에소성중에배출되는이산화탄소의양은천만톤에이른다고한다. 탄산칼슘은자연상에암석의형태로만존재하는것이아니라동물의뼈, 조개껍질등과같은형태로도존재한다. 패각 ( 조개껍질 ) 은탄산칼슘이주성분 ( 약 95%) 을이루고작은양의유기물 ( 약 5%) 로구성 되어있어, 암석형태의석회석이외에탄산칼슘을풍부하게함유하고있는자연자원이다. 따라서, 폐조개를재활용하려는많은시도가있어왔지만, 이전의시도는역시나고온소성공정을포함하고있다. 본연구에서는폐기물조개껍질을이용하여상온에서 closed system 을적용하여방출된이산화탄소를포획하는방식으로 CO 2 배출을최소화하여침전된탄산칼슘파우더를제조하였다. 이방식은저온공정에저탄소배출공정으로친환경적공정이면서도처치곤란한페기물처리에있어서매우효과적인방식으로생각되어진다. 패폐각으로부터얻어진탄산칼슘분말은채광및소성석회암으로만든상업적으로침전된분말보다훨씬높은순도를가지고있었으며, 공정조건에따라탄산칼슘의결정화를조절할수있었다. P3-G2-5 Electrochemical Properties of Sr 2 Nb 3 O 10 Ultra-thin Films Grown by Langmuir-Blodgett Method 랭뮤어블로젯방법으로증착한스트론튬나오븀옥사이드박막의전기화학특성이웅희 *, 권상효, 임미르, 남산. 고려대학교 Metal oxide-based materials for the pseudocapacitors have been widely investigated because they showed the higher specific capacitance than the electric-double-layer capacitors (EDLCs). Recently, a new type of pseudocapacitor, which can be explained by the cation intercalation mechanism, has been proposed. Present work - investigates the electrochemical properties of the Sr 2 Nb 3 O 10 (SNO) nanosheets for the application to the pseudocapacitors. The SNO was obtained from KSr 2 Nb 3 O 10 (KSN) ceramics using soft-chemical exfoliation. KSN is one of the Dion-Jacobson (D-J) layered perovskites that is useful for the application of ultra-thin films. They can be easily exfoliated layer-by-layer to form nano-sized sheets. The exfoliated SNO nanosheets were deposited on a Pt/Ti/SiO 2 /Si substrate using the Langmuir-Blodgett method at room temperature. The structural and supercapacitor properties of these films will be presented in this work. P3-G2-6 Structural Investigation of Lithium-Containing Metal Sulfides with Layered Structure by Neutron Diffraction Study 중성자회절분석을통한, 층상구조리튬함유금속황화물의구조고찰김재겸 1*, 임한진 1, 김성철 1, 김영일 2, 김승주 1. 1 아주대학교, 2 영남대학교 The crystal structure of Li 5 AlS 4 was characterized by ab initio structure determination on the basis of powder neutron diffraction data. This structure is built from a hexagonal close-packed (hcp) arrangement of sulfur atoms with a stacking sequence of ABAB. The hcp sulfide lattice consists of two different double-sulfide layers alternately stacked along the c-axis. Between the first pair of sulfur layers all the tetrahedral interstices (T + and T - sites) are filled with lithium and aluminum atoms. All octahedral interstices between the second pair of sulfur layers are occupied by the remaining lithium atoms. We have compared the structure of Li 5 AlS 4 with those of various lithium-containing metal sulfides like Li 2 FeS 2, NaLiMS 2 (M = Zn, Cd), Li 4 GeS 4, LiGaS 2 and γ-li 3 PS 4 to discuss the correlation between the structure and the lithium ionic conductivity. 한국세라믹학회 195

216 2017 년한국세라믹학회추계연구발표회 P3-G2-7 Carbonized Nano Cellulose Metal Oxide Composite based Supercapacitor for High Performance Energy-storage System 고효율에너지저장시스템을위한탄화나노셀룰로오스-금속산화물기반의수퍼캐패시터이희진 *, 윤철민, 이준봉, 이호진, 윤여균, 이상우, 조아영, 최택집. 세종대학교 Supercapacitor has been extensively studied among the electrochemical energy storage systems due to its high-power performance and long cycle life. Interconnected porous nanostructure with large specific surface area is necessary for enhanced supercapacitor performance. In this study, we designed 3 dimensional (3D) architecture from nano cellulose and iron oxide through colloidal synthesis for supercapacitor with high specific capacitance and excellent electrochemical stability. Compared to single structured materials, our 3D heterostructures of carbonized nano cellulose - iron oxide composites have higher specific capacitance and longer cycle stability due to high surface area of ion-accessibility and high electric conduction. Such an improved supercapacitor performances are attributed to synergic effect of larger porosity, carbonized nano cellulose based conduction path and iron oxide nanoparticles with good redox reactions. Our results demonstrate that 3D nanostructured metal oxide nano cellulose composite are of importance in development of high performance energy-storage systems. P3-G2-8 Synthesis of BaSnO 3 Nano-crystalline Using Hydrothermal Method 수열합성법을이용한 BaSnO 3 나노결정합성차유림 *, 이유나, 윤영수. 가천대학교 BaSnO 3 물질은이의우수한구조적, 광적, 전기적특성을가지는것으로알려져있다. 특히, BaSnO 3 는 perovskite 구조적특성으로인하여전기전도성을가지며, 이를이용하여센서, n형반도체, 태양전지, 콘덴서, 광촉매, 광양극등의연구에주목받고있다. 이에본연구에서는수열합성법을이용하여나노크기의 columnar, hollow, sphere 구조를가지는다양한형태의 BaSnO 3 를합성하였다. NaSnO 3, Ba(NO 3 ) 2 를사용하여 columnar 구조의 BaSn(OH) 6 를합성하였고, Hollow 구조의 BaCO 2 core@shell 형태를만들기위해 Etheylene Glycol, BaCl 2 *2H 2 O, Na 2 CO 3, Na 2 SnO 3 *3H 2 O 를사용하였다. 합성된 BaSn(OH) 6 와 BaCO 2 core@shell을하소시켜 BaSnO 3 를얻을수있었다. Sphere 구조의 BaSnO 3 는 columnar 구조의 BaSnO 3 을합성한후볼밀링을함으로써얻을수있었다. 합성된 3가지구조의 BaSnO 3 를 SEM, XRD, EDS를통해구조및정성분석을하였고, 전기전도도측정을통한전기적특성을확인하였다. 구조에따른전기전도도의차이를확인할수있었으며향후다양한분야에활용가능성을확인하였다. P3-G2-9 Development and Evaluation of Li 2 TiO 3 Ceramic Material for Tritium Production 삼중수소생산을위한 Li 2 TiO 3 세라믹재료합성및특성평가김대윤 *, 김인예, 윤영수. 가천대학교최근 ITER(International Thermonuclear Experimental Reactor) 프로그램과같이핵융합에대한관심이증가하고있다. 핵융합은원자력발전과달리친환경적인발전으로원자력발전만큼높은에너지를발생시킬수있다. 핵융합발전을위해서는삼중수소가필요하며, 삼중수소는자연계에존재하지않으므로인위적으로만들어 야한다. 핵융합반응에서삼중수소증식재로사용되는리튬은중성자와의반응을통하여삼중수소를형성하게된다. 이때삼중수소증식재는높은열적, 화학적안정성을가져야하며, 빠른삼중수소방출등의특성을가져야한다. 삼중수소증식재로사용되는물질로는 Li 2 O, Li 2 TiO 3, LiAlO 2, Li 2 ZrO 3, Li 4 SiO 4 등이있으며, 그중 Li 2 TiO 3 는높은기계적및다른물질과반응에대한화학적안정성, 높은삼중수소확산으로인하여가장유망한후보중하나이다. 본연구에서는볼밀공정을적용한고상법으로 Li 2 TiO 3 세라믹재료를합성및특성평가를진행하였다. 핵융합모사환경에서삼중수소증식재내의리튬이온의이동을확인하기위하여임피던스측정을진행하였으며, 핵융합로내블랭킷과의반응성을확인하기위하여 STS316L 과의확산시험을진행하였다. 이와같은분석을통하여 Li 2 TiO 3 세라믹분말이삼중수소증식재로써적합한지확인하였다 P3-G2-10 Synthesis of Highly Uniform CuCo 2 S 4 Ball-in-ball Hierarchical Nanospheres as High Performance Electreode for Supercapacitors 슈퍼캐패시터를위한고성능전극으로서매우균일한 CuCo 2 S 4 ball-in-ball의계층적나노구의합성이영훈 1*, 유정현 1, 최동수 2, 윤대호 1. 1 성균관대학교, 2 동아대학교 In recent years, supercapacitors (SCs), an electrochemical energy storage device, have emerged as an alternative to solve excessive energy consumption and depletion of fossil fuels. Although SCs possess excellent cycling stability, high power density and specific capacitance, the performance of SCs has been restricted for their low energy density. The characteristics of SCs are dependent on their electrode materials, configurations and morphologies. In the case of electrode materials, Binary transition metal sulfides (BTMSs) such as CuCo 2 S 4 have several key advantages; rich redox reactions, the synergistic effects by interaction between diverse metal compound, better specific capacitance and electrical conductivity than single transition metal oxides. In particular, the ball-in-ball structure of the electrode material can decide diffusion/transport paths of electrons, the specific surface area and the active sites for electrochemical reactions. Herein, we successfully synthesized the CuCo 2 S 4 novel ball-in-ball multi-shell nanostructures via uniform CuCo-glycerate nanospheres as precursor for SCs. The structural and chemical compositions of CuCo-glycerate and CuCo 2 S 4 were confirmed through SEM, TEM, XRD and FT-IR. In addition, their electrochemical performances were investigated by CV and galvanostatic charge/ discharge measurements. P3-G2-11 High Performance Impregnated Composite Cathode for Reversible Protonic Ceramic Fuel Cells Saqib Muhammad *, You-Dong Kim, Jun-Young Park. Sejong University Declining fossil fuels and global weather changing are great concerns for researchers worldwide. The improvement of the fuel efficiency and exploitation of reproducible energy sources are the key to the problems of energy supply and environmental pollution. Reversible solid oxide cells (RSOCs), which can work in both fuel cell and electrolysis cell modes, have attracted increasing attention to solve these issues. Reversible solid oxide cells (RSOCs) can work for power generation by converting fuel chemical energy directly to electric energy as solid oxide fuel cells (SOFCs). And they also can convert 196 한국세라믹학회

217 포스터발표 III excess electrical power to chemical energy as solid oxide electrolysis cells (SOECs) for oxygen production. Researchers have investigated proton conducting fuel cells (PCFCs) as a promising alternative to a high temperature operating SOFCs. PCFCs can provide an intriguing potential at intermediate temperature (IT), low activation energy, high Nernst potential, and good fuel utilization. However, in comparison to SOFCs, the performance of PCFCs is still lacking due to suitable cathode materials. In this study, we tailor the cathode by applying wet impregnation method to extend the triple phase boundaries (TPBs) of the air electrode. Moreover, in order to investigate the practical use of PCFCs, the accelerated durability test is designed and carried out by periodical current cycling stresses.the objective of this work is to achieve high performance and durable cathode for PCFCs. P3-G2-12 Improvement of the Durability of Flat Tubular Cells for High-temperature Steam Electrolysis and Cyclic Operation 평관형양방향수전해셀의양방향전환운전안정성확보안준성 1*, 최성민 2, 박만수 2, 이종호 2, 김병국 2. 1 서울대학교, 2 한국과학기술연구원수소는기존전기화학적에너지저장방식인 2차전지에비해에너지밀도가 5~10배큰이상적인에너지저장물질로서대용량 고효율에너지저장및전력생산이가능한최적의미래에너지원으로평가받고있다. 최근수소의형태로에너지를외부시설에저장하기때문에저장용량과시간의제한이없는양방향가역연료전지기술이차세대에너지저장시스템기술로주목받고있다. 안정적인전력생산과에너지저장및분산형발전의관점에서연료전지및수전해셀을통합한가역연료전지는대용량수소생산 / 저장및전력생산이가능하므로, 전력의수요충족및안정적에너지공급에최적의기술이될것이다. 따라서현재까지확보한 SOFC용세라믹소재 공정기술을바탕으로평관형양방향수전해셀에최적화된구성소재, 공정기술및미세구조제어기술을개발함으로써수전해성능을향상시키고양방향전환운전의안정성을확보하고자한다. P3-G2-13 Development of Novel Bi 2 O 3 -based Oxygen Ion Conductors via Double Doping Strategy 이중도핑전략에의한신조성비스무스산화물이온전도체개발윤병현 *, 강석범, 최도영, 김대원, 이강택. DGIST 고체산화물산소이온전도체는고체산화물연료전지 (SOFC), 산소센서및산소분리막과같은다양한분야에응용될수있어광범위한연구가진행되어왔다. 대표적인산소이온전도체로는 fluorite 구조를가지는 ZrO 2, CeO 2 그리고 Bi 2 O 3 계열이존재하는데, 그중에서도 Bi 2 O 3 계열이가장높은산소이온전도도를가지는것으로알려져있다. 최근 Dy 0.08 Gd 0.04 Bi 0.88 O 1.5 (DGSB) 와 Dy 0.08 W 0.04 Bi 0.88 O 1.5+δ (DWSB) 와같이이중도핑전략을이용하여개발된 Bi 2 O 3 기반이온전도체는일반적으로단일도펀트만을가지는이온전도체보다높은이온전도도를가지는것으로보고되어있다. 하지만이러한물질을개발하기위해필요한도펀트간의비율및함량이결정학적, 열적그리고전기화학적성능에미치는영향을밝히는기초연구는많이진행되어있지않을뿐만아니라아직시도되지않은도펀트의조합이다수존재한다. 따라서본연구에서는이중도핑전략을이용하여신물질을개발하고, 이에대한구조적, 열적, 전기화학적특성을측정하였다. P3-G2-14 Systematic Study on Compositional Effect on Fundamental Properties of Stabilized Bi 2 O 3 안정화비스무스산화물의조성변화에따른기초물성연구윤병현 *, 정우영, 박재우, 이강택. DGIST 고체산화물연료전지 (SOFC) 는높은효율로인해서차세대에너지변환장치로주목을받아오고있다. 하지만높은구동온도 ( 800 o C) 로인해장기간구동시성능열화가크게발생하는문제를안고있다. 따라서구동온도를중저온으로내릴시에도합리적인성능과안정성을가지는 SOFC를개발하기위해서 750 o C 이하의중저온에서도높은이온전도도를가지는전해질물질을개발하는연구가광범위하게진행되어왔다. 안정화 Bi 2 O 3 은 730 o C 에서 830 o C 사이에존재하는 δ 상이구조내에존재하는높은산소결함 (25%) 으로인해서높은이온전도도를가지고있다. 하지만그이하의온도에서는이온전도도가낮은상으로상변이일어나다. 따라서 δ 상을낮은온도범위까지안정화시키는연구가진행되어왔다. 본연구에서는 δ 상을안정화시키기위해서두가지도펀트를동시에사용하는이중도핑전략을사용하였다. 지금까지함께사용되어오지않았던두도펀트간의비율과함량을체계적으로조절하여, 이에따른 δ 상안정화에미치는영향을 XRD 를통해서관찰하였고, 열분석을통해서상안정성을관찰하였다. P3-G2-15 Development Low-end Ceramic Panel and Paint for Humidity Control to Improve the Residential Environment 주거환경개선을위한저가보급형습도조절용세라믹패널및도료개발김태연 1*, 이종규 1, 윤석영 2. 1 한국세라믹기술원, 2 부산대학교취약계층은일반가구에비해시설및가구가열악한환경에서생활하여과습도 (80%RH 이상 ), 과건조 (30%RH 이하 ) 에노출되어건강을위협받고있는반면국내외흡방습자재기술은고가이거나취약계층의주거에적용하기엔기능상부적합한측면을가지고있다. 취약계층의경제적부담을고려하여석고와활성백토를이용해저가에성능이우수한패널및도료를제조하여흡방습, 휨강도, 부착강도, 열전도율을평가하였다. 패널의휨강도는백시멘트첨가시증가하고흡방습은활성백토비율이증가할수록높은성능을보였다. 도료의부착강도와흡방습은활성백토의증가에따라성능이좋아졌고 1 mm 두께보다 3 mm 두께가흡방습량이 25% 증가하였다. 패널의열전도율은타제품보다낮은값이측정되었으며도료는유사한수치가측정되었다. 이연구를통해취약계층은저렴한친환경조습자재를제공받고전력을사용하지않는제품을사용하여에너지를절감시켜무전력제습을실현함으로써탄소를저감시키는효과를기대할수있다. P3-G2-16 Nanocellulose-metal Oxide Hybrid Nanostructure for Flexible Electrode of Li-ion Battery 윤철민 *, 최택집. 세종대학교 Nanocellulose is considered as the sustainable materials due to renewability, affordability and non-toxicity in nature. As a chemical raw material, nanocellulose can form flexible or strong networks that are suitable templates for artificial nanostructure with enhanced electrochemical performances. Here we prepared nanocellulose-metal oxide hybrid nanostructure from cellulose nanofibrils and oxide nanobelt via hydrothermal method using transition metal oxide precursor and TEMPO oxidized cellulose nanofibers. Oxide nanobelts with high aspect ratio are structurally uniform and single crystalline. Nanocellulose-metal oxide hybrid nanostructures are formed into 한국세라믹학회 197

218 2017 년한국세라믹학회추계연구발표회 films by vacuum filtration and hot-pressing, and then films are carbonized under compared regarding electrochemical performance for Li-ion batteries. Our hybrid nanostructure can provide a new route into the development of high capacity, unique architecture, and suitable electrode potential for promising electrode materials. P3-G2-17 Evaluation Methods for Active Length of the Light Water Reactor Fuel Corresponding to Each Scanning Method by a Gamma Detector 감마검출기를이용한스캐닝방법에따른경수로사용후핵연료소결체의 active length 평가방법권형문 *, 오완호, 장정남, 김도식. 한국원자력연구원경수로사용후핵연료소결체의 active length는피복관내부의소결체에서방출하는감마선을연료봉측면에서검출하여측정할수있다. 이방법은연료봉하단부터일정한속도로연료봉을하강하면서측면에고정설치된감마선검출기로연료봉으로부터방출되는감마선을계수하여핵연료소결체위치를비파괴적으로확인하는방법이다. 연료봉을스캐닝하는방법에는대략 3 가지정도가있다. 첫번째는스캐닝하는연료봉이채널당일정길이를이동하면서측정하는방법이고, 두번째는스캐닝하는채널의시작시간과종료시간을확인하여스캐닝하는위치를확인하는방법이다. 세번째는두가지방법과다르게일정간격의위치에서연료봉을정지하고, 정지하는동안감마선을계수하는방법이다. 각방법에따라사용후핵연료의 active length 평가방법은달라지게된다. 본연구에서는각스캐닝방법에따른 active length 평가방법을도출하였다. P3-G2-18 Optimization of Sb-incorporated Cu 2 O Thin Film for High Crystallinity and Conductivity Sb를첨가하여성장한 Cu 2 O박막의고결정성, 고이동도를위한성장조건의최적화윤영대 *, 조형균, 백승기, 김주성, 김영빈. 성균관대학교 p형산화물반도체인 Cu 2 O는높은흡수계수를가지며자원친화형, 친환경적소재이기때문에태양전지의흡수층, 물분해광전지의광음극소재등다양한활용이가능하다. 이러한 Cu 2 O 박막을넓은면적에서증착, 전구체의재활용, 저가설비, 저온증착등의장점이있는전기화학증착공정으로증착하면산업, 경제적경쟁력이진공공정에비해우위를점할수있다. 하지만기존의전기증착법을이용하여성장한 Cu 2 O 박막은진공공정을이용하여성장한박막에비해낮은전도도를갖기때문에이를기반으로태양전지의흡수층이나물분해의광음극을제작할경우빛에의해생성된전자와정공이효과적으로이동하지못해소자의효율이진공공정기반결과에비해낮을수밖에없다. 이러한박막의전도성문제를해결하고자증착방법의최적화, 증착후처리공정적용등다양한방법이시도되었다. 본연구는기존의문제를해결하는방안으로성장거동부터제어할수있는계면활성제 Sb를첨가하여 Cu 2 O 박막의우선배향성을향상시켜박막의이동도를개선시켰으며, 추가적인열처리공정과성장 potential 변화를통하여 Cu 2 O 박막의전도도및결정성을최적화시키는내용에관한것이다. Cu 2 O 박막의전기증착성장과정에서 Sb 이온을첨가하고성장 potential에변화를주어최적화점을찾았고, 최적박막에대하여결정성과전도도확보를위한열처리추가공정을진행하였다. 성장한박막들에대하여 X-ray diffraction, current-voltage 등을통해증착된박막의구조적, 전기적특성을분석하였으며전기화학적분석방법인 capacitance-voltage, impedance spectroscopy 등을통 해 Sb 몰농도별박막의캐리어농도및이동도특성을분석하여박막특성을확인하였다. P3-G2-19 The Electrochemical Property of Nanostrucutral LiNi 0.6 Co 0.2 Mn 0.2 O 2 Cathode Materials for Li Ion Battery 나노구조를갖는 LiNi 0.6 Co 0.2 Mn 0.2 O 2 양극활물질의전기화학적특성심재현 *, 김영민. 성균관대학교 Cathode materials in Li ion batteries strongly depends on their morphology and size, thus if morphology of cathode material is transformed during Li ion insertions and extraction in the host materials, it could drastically affect the electrochemical performance. In particular, further the morphological changes also brings fresh surface of cathode materials in contact with electrolyte that rebuild solid electrolyte interface (SEI) layers which cause irreversible loss of capacity. Therefore, a nano-sized cathode materials having a large specific surface area will form more SEI layers, which results in deterioration of electrochemical performance. In this study, we tried to incorporate nano-sized cathode materials with high specific surface area into bulky cathode materials. The cathode materials, which is produced by confining a nano-sized materials within a bulk-sized material, can reduce the reaction area with the electrolyte. In addition, since the prepared cathode active material has a similar size of the commercial cathode materials, there is no restriction on the use of the conductive agent and the binder to prepare the current collector. These materials can exhibit the high capacity and high rate characteristics of the nanostructural cathode materials and can overcome the surface SEI layers of the nanostructure and the low capacity per volume. P3-G2-20 CuIn 3 Se 5 Photoelectrochemical Cell for Water Splitting System with High Photocurrent 김주성 *, 김영빈, 백승기, 윤영대. 성균관대학교 Photoelectrochemical (PEC) water splitting system is one of the attractive energy harvesting methods due to the exhaustion of fossil energy problems. The search of photo-active materials with suitable band gap led us to research chalcopyrite compounds. Recently, many papers are reported about the physical properties of CuInSe 2, and it shows high solar energy conversion efficiency of 20.4%. However, just fewer papers dealing with the physical properties of CuIn 3 Se 5 have been reported for photoanode. In our study, n-type semiconductor CuIn 3 Se 5 is a suitable photo-absorption material for PEC water splitting system because of its adequate direct band gap of 1.3 ev, which can absorb a significant part of the solar spectrum. The holes excited into the valence band of CuIn 3 Se 5 are energetic enough to be transferred to water for oxygen evolution. Nevertheless, CuIn 3 Se 5 photo-anode has a critical limitation in terms of high PEC performance. The high performance of CuIn 3 Se 5 based PEC cells has been limited because of surface defect sites which cause a decline of charge transfer at the interface between electrolyte and surface. In this work, Enhanced surface condition of CuIn 3 Se 5 with Al 2 O 3 passivation layer shows a high photo-absorption performance it because of suppressed the charge recombination on the surface, and good stability. A high photocurrent with only one photo-absorption 198 한국세라믹학회

219 포스터발표 III layer CuIn 3 Se 5 is highly significant result for PEC water splitting system. P3-G2-21 Fabrication and Characterization of Oxide Coatings Formed on Aluminium wire by Plasma Electrolytic Oxidation 박상준 *, 송정환, 임대영, 조민정. 배재대학교 Plasma electrolytic oxidation (PEO) is environmentally friendly electrochemical techniques used to improve the desired functional properties by creating thick, dense, and ultrahigh hardness oxide coatings with high insulation resistance on light metals and their alloy. The PEO treatment of light metal alloy can be applied to computers, automobiles, aerospace components, a plurality of equipment and materials, such as engineering equipment parts. Light metals are expected as a replacement material has an advantage in light weight, durable, energy efficient. Passive metals such as light metals of Al, Mg, Ti may have a number of problems such as corrosion resistance, wear resistance, oxidation resistance. Study on surface treatment of the light metals for solve this problem, it is being actively conducted. We present our results on the structure and properties of the oxide coatings formed on Al wire by the PEO process with fixed electric parameters such as current density and ratio of anode/cathode current. The crystal structure, surface and cross-section morphology, and hardness of the oxide coatings formed on Al wire was precisely measured. P3-G2-22 Absence of Distinctively High Grain-Boundary Impedance in Polycrystalline Cubic Bismuth Oxide 다결정비스무스산화물에서결정립과입계의교류임피던스분석정현준 *, 정성윤. KAIST In this work, we studied a fluorite structure oxides: Yttria stabilized zirconia, (YSZ); Gd doped CeO 2 (GDC); erbia stabilized Bi 2 O 3 (ESB); Zr doped erbia stabilized Bi 2 O 3 (ZESB); Ca doped erbia stabilized Bi 2 O 3 (CESB) in the temperature range of 250 to 600 o C using electrochemical impedance spectroscopy (EIS). As is well known, grain boundary blocking effect was observed in YSZ and GDC. However, there is no grain boundary effect on ESB, ZESB, and CESB. The Nyquist plots of these materials exhibit a single arc at low temperature. This means that there is no space charge effect on δ- Bi 2 O 3. In addition, impedance data was analyzed by using the brick layer model. We indirectly demonstrate that grain boundary ionic conductivity is similar to or even higher than bulk ionic conductivity on cubic bismuth oxide. P3-G2-23 Photovoltaic and Grain Boundary Characteristics of CuIn 0.7 Ga 0.3 Se 2 Thin Films Processed by a Na-Dissolved Precursor Solution Na 첨가전구체용액에의해제작된 CuIn 0.7 Ga 0.3 Se 2 박막의광전및결정립계특성장진우 *, 최익진, 이승민, 조용수. 연세대학교 This work deals with the effect of intentional Na incorporation into the CuIn 0.7 Ga 0.3 Se 2 (CIGS) absorber thin films by a simple spin-coating process of Na-dissolved non-toxic precursor solution in regard to enhanced photovoltaic efficiency and grain boundary potentials. The achieved efficiency of ~8.21% is the best efficiency so far for the pure CIGS thin film absorbers without post-sulfurization process. The increases in carrier concentration, open circuit voltage and fill factor are responsible for the enhanced photovoltaic properties. These properties depend on the content of Na. Potential contribution by defects is discussed based on photoluminescence spectra of samples with different Na content. Na incorporation may induce the reduction of the donor-like In Cu defects and thus incur the increases of net hole density and open circuit voltage. The proper incorporation (~ 0.25 mol%) of Na turns out to be beneficial in creating favorably a higher grain boundary potential, which provides better current pathways, as observed by means of Kelvin probe force microscopy. P3-G2-24 The Effects of Blended Cathode Materials for Allsolid-state Li-ion Batteries 전고체리튬이온전지에대한혼합양극의효과이정선 *, 허국진, 송혜경, 김동윤, 임진섭. 한국생산기술연구원 Currently, rechargeable lithium-ion batteries (LiBs) are widely used for xevs such as hybrid, plug -in hybrid and electric vehicles as a power source. However, the safety concern of the LiBs is still one of the major challenges due to using flammable organic liquid electrolytes. All-solid-state batteries (ASSB) may be promising candidate to solve the problem because it uses non-flammable inorganic solid electrolytes as an electrolyte and separator. The effects on the blended cathode materials for all solid state lithium-ion batteries with an oxide based solid electrolyte were studied. The parent materials can minimize their shortcomings by blending two cathode materials and the blending ratios may be tailored for high energy, power density with improved stability. In this report, we investigated the influence of blended cathode materials such as LiNi 0.7 Co 0.15 Mn 0.15 O 2 /LiFePO 4 on the structure, cycling stability and rate performance by tools such as Powder X-ray Diffraction, Field-emission SEM, and a Differential Scanning Calorimeter (DSC) and energy dispersive X-ray spectrometer (EDS) analysis. P3-G2-25 Optimization of Electrode-electrolyte Interface for All-solid-state Lithium-ion Batteries by Using Hot Press Process 핫프레스공정을통한전고체전지의양극전해질계면특성연구김태현 1,2*, 윤빈나 1, 정훈기 1. 1 한국과학기술연구원, 2 고려대학교 Since there is a steady demand to decrease the usage of fossil fuel for Clean-society, lithium-ion batteries have received a lot of attention as large-scale power storage system. In general, traditional organic electrolyte of lithium-ion batteries reveals the risks of flammability. In this regard, the use of inorganic solid electrolytes is the key material for resolving safety issue. Despite of such a big advantage of safety issue, inorganic solid electrolytes are very difficult to use in solid state batteries mainly because of hardship to construct the intimate contact on cathode-electrolyte interface which originated from the void and mismatched grain boundary. Therefore, the contact of materials must be improved by adopting a revised press condition. In this work, the hot press process is introduced as an effective technique to increase the contact point in the materials. Surface and cross section of hot pressed composite cathode are inspected by SEM/ EDS analyses which reveal that voids and grain boundaries were remarkably reduced. In consequence, there is increased ionic transportation of Li in electrode-electrolyte interface. Furthermore, 한국세라믹학회 199

220 2017 년한국세라믹학회추계연구발표회 Li[Ni 0.6 Co 0.2 Mn 0.2 ]O 2 /Sulfide solid electrolyte/indium metal half-cell was assembled by means of the optimized hot press process and electrochemical performance was investigated. P3-G2-26 Synthesis and Characterization of High Temperature Stable Pt@SiO 2 Catalyst 고온에서도안정한 Pt@SiO 2 촉매의합성과특성평가김승현 *, 이시원, 정우철. KAIST Metal nanoparticles have been widely used due to their excellent reactivity in chemical and electrochemical catalytic processes, such as automobile exhaust control and hydrocarbon reforming. However, the catalytic activity loss caused by aggregation of nanoparticles always arises as a big obstacle to application in high temperature processes. Thus, many studies are ongoing to hinder agglomeration. In this study, we have successfully fabricated Pt nanoparticles with three different sizes individually coated with gas permeable silicon oxide shell (Pt@SiO 2 ) by sol-gel method using TEOS as silica source. Physical characterization have been performed using transmission electron microscopy (TEM), X-ray diffraction (XRD) and Brunauer-Emmett- Teller (BET). The samples showed resistance to sintering in temperature up to 650 C. To confirm the catalytic activity of the samples in high temperature reaction, methane oxidation have been performed and their reactivity depending on their Pt core sizes have been discussed. Through the synthesis of well-controlled Pt@SiO 2 catalyst, stability and catalytic activity is achieved even in high temperature. P3-G2-27 Study on the Complex Carbonate Formation Behavior of CFBC Coal Ash 순환유동층발전회를활용한복합탄산염생성거동연구남성영 1*, 김춘식 1, 조용광 1, 서신석 1, 조성현 1, 이형우 1, 안지환 2. 1 한일시멘트, 2 한국지질자원연구원삼척화력순환유동층발전소는저품위석탄, RDF 등의다양한가연성물질에대해광범위한연소사용이가능하며, 약 900 o C의낮은연소로질소산화물생성을억제할수있는장점으로최근각광받고있는연소방식이다. 그러나, 부산물인발전회는콘크리트또는모르타르혼화재료로서규정하고있는플라이애쉬 (KS L 5405) 기준치의 SiO 2, Al 2 O 3, Fe 2 O 3 등의무기물질함량이낮아부합하지못하며, 산화칼슘 (CaO) 이 PC 연소발전회에비해상대적으로다량함유되어있어콘크리트혼화재로사용할경우유리석회 (free- CaO) 성분이콘크리트의이상응결현상, 슬럼프의손실, 지연제의사용량증가, 내구성저하등의문제를발생시킬수있다. 특히콘크리트의팽창, 균열등의문제를발생하여물성을저하시키는것으로알려져있어, 새로운재활용용도및방안확보가필요한상황이다. 본연구에서는팽창, 균열등의문제를일으키는산화칼슘 (CaO) 와 CO 2 를활용하여복합탄산염물질을제조하여, 온실가스저감뿐만아니라광산채움재등의신규재료로서활용을목적으로하였다. 다양한복합탄산염생성조건하에고액비 (Liquid/Solid), 온도, CO 2 농도, 압력등다양한조건에서 CO 2 고정화에따른거동을평가하여최적조건을도출하였다. 본논문은환경부글로벌탑환경기술개발사업중유용자원재활용기술개발사업 ( 과제번호 : ) 의지원에의하여연구되었으며이에감사드립니다. P3-G2-28 Process Analysis of Purification and Continuous Casting of Multicrystalline Silicon Ingot for Solar Cell 태양전지용다결정실리콘잉곳의고순도화및연속주조공정해석이준규 *, 이진석, 안영수, 강기환. 한국에너지기술연구원야금학적정련법인방향성응고를이용해실리콘잉곳을고순도화및연속주조하기위해서는실리콘잉곳이주조될때내부응력과미세구조가제어되어야만한다. 본연구에서는방향성응고를다결정실리콘잉곳을주조할때원통형도가니의온도분포, 응고거동및응력분포를공정해석을통해서계산하였다. 또한공정조건에따른잉곳의미세구조를예측하였고, 같은조건에서제조된잉곳과비교함으로써공정해석을통한주조해석의신뢰성을검증하였다. 최종적으로잉곳제조시공정변수가될수있는성장속도, 출력, 실리콘용탕수위를 Moving Mass Source Methode에적용하였으며, 이를이용해잉곳주조시응력을최소화하고미세구조를제어할수있는공정조건을확인하였다. P3-G2-29 Synthesis of Rod-shaped LiCoO 2 by Hydrothermal Method 수열합성을이용한 rod 형태의리튬코발트산화물의합성김학연 *, 양재형, 김태중, 김용선. 인하대학교 LiCoO 2 (LCO) is the most widely used for cathode material for lithium ion batteries (LIBs) because of its good properties in every aspect required for LIBs. In this study, rod-shaped LCO particles were synthesized via hydrothermal method followed by twice heating process: the Co-precursor of Co(CO 3 ) 0.35 Cl 0.2 (OH) 1.1 nanorods was prepared by a hydrothermal route. the precursor was transformed into Co 3 O 4 by heating at 450 ~ 500 o C. Finally, the Co 3 O 4 were mixed with LiOH H 2 O, and calcined at 750 ~ 1000 o C to synthesize LCO. The morphological and structural characteristics were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD), and the electrochemical property was measured by galvanostatic charge/discharge test. The results indicated that heating at 500 o C and 800 o C during the first and second heating process respectively provided optimized electrochemical performance while maintaining the rod shape of the LCO particles. P3-G2-30 P2-type Layered Cathode Materials for Sodium-ion Rechargeable Batteries with High Initial Coulombic Efficiency 소듐이차전지에서높은초기쿨롱효율을갖는 P2 type 층상구조양극재김성인 *, 유승을, 엄지용. 자동차부품연구원 Sodium-ion rechargeable batteries (SIBs) have attracted great attention as promising next-generation rechargeable batteries, especially for large-scale energy storage systems (ESS), owing to the natural abundance of Na resources and the similarities in their chemical structure and reaction mechanism to commercial lithium-ion batteries (LIBs). Thus, enormous efforts have been made to improve the electrochemical performance of SIBs through the development of novel cathode materials. According to the previous literatures, P2-type layered cathode materials for SIBs have suffered from their low initial coulombic efficiency, which inevitably requires the pre-sodiation of carbon anode materials under full cell systems. In this regard, we focused on how to increase their initial charge capacity with sacrificial salts in the level of electrode fabrication. Actually, the suppression of irreversible 200 한국세라믹학회

221 포스터발표 III capacity of P2-type layered cathode materials are challenging without specific electrode design. Thus, in the present study, we suggest new electrode fabrication process with sacrificial salts (i.e. NaN 3 ) to reduce the high initial irreversible capacity of P2-type layered cathode materials for SIBs. P3-G2-31 Fabrication of Polyaniline Loaded ZnO/ZnS/FTO Phtoelectrode for Enhanced Hydrogen Generation 수소제조용 polyaniline/zno/zns/fto 광전극김현 *, 양비룡, Brayek Amine. 금오공과대학교 Heterojunction structures are attracting lots of attention for enhancing the electron injection across the interface. ZnO-ZnS@polyaniline one-dimensional nanohybrid films are synthesized on conducting glass substrates in a controlled way, using a simple three-step electrochemical deposition, chemical sulfurization of ZnO nanowire array as reactive template and spin-coating technique. The Electrochemical measurements were performed under visible light. The light irradiance, measured by a thermopile detector, was 100 mw/cm 2. A monochromator (74,000, Newport) was used to investigate the monochromatic responses (for IPCE, applied bias photon to current efficiency (ABPE), and band gap energy measurements) of samples. 1 The as-prepared ZnO-ZnS@polyaniline one-dimensional nanohybrids are found to exhibit significantly an enhancement in the IPCE as compared to ZnO nanowire arrays. The observed enhancement in photoelectrochemical activity is attributed to the photosensitization effect of visible light responsive PANI. The special electron structure in the heterojunction helped to reduce the energy barrier height at the interface and enhanced the separation of photo-generated carriers. Thus, the photoelectrochemical performance and the dispersing stability of the composite photocatalysts in water were highly improved. Hence, our proposed structure is a promising candidate as a photoanode for solar energy-to-hydrogen conversion devices. P3-G2-32 Photoelectrochemical Reduction of CO 2 to Methanol Using Ag NPs-loaded NiO/BaTiO 3 /FTO 광전기화학적 CO 2 환원메탄올제조용 Ag NPs/NiO/BaTiO 3 /FTO 김현 *, 양비룡, Brayek Amine. 금오공과대학교 As a cathode material for fuel generation from CO 2 reduction in a photoelectrochemical system, layered BaTiO 3 /NiO films were developed and their surfaces were decorated with transition metals (i.e. Ag, Au, Cd, Cu, Pb, and Sn). Deposition of the transition metals effectively enhanced CO 2 conversion to fuel in terms of faradaic efficiency. In particular, Ag/NiO/BaTiO 3 demonstrated outstanding performance among the transition metals: for methanol yield production with high faradaic efficiency at V (vs. SHE), which was a higher potential than standard redox potentials of methanol formation from CO 2. Moreover, electrochemical impedance spectroscopy (EIS) showed that the deposition of the transition metals onto BaTiO 3 /NiO electrode effectively generated photo-induced electron hole pairs under visible light irradiation. The reported system consisting of Barium Titanate and over-layer Nickel oxide loaded Ag NPs exhibits remarkable stability with time. P3-G2-33 Band Alignment Offset Study of Polyaniline/ZnS/ ZnO Heterojunctions Polyaniline/ZnS/ZnO 헤테로접합밴드구조김현 *, 양비룡, Brayek Amine. 금오공과대학교 Energy band alignments at heterointerfaces play a crucial role in defining the functionality of semiconductor devices, yet the search for material combinations with suitable band alignments remains a challenge for numerous applications. The energy band alignment at the heterointerface between ZnO, ZnS and PANI was studied using photoelectron spectroscopy. We investigated band offsets at PANI/ ZnS and ZnS/ZnO interfaces in a typical PANI/ZnS/ZnO heterojunction PEC cell by combining x-ray photoelectron spectroscopy and optical absorption spectroscopy. X-ray photoelectron spectroscopy and optical absorption spectroscopy measurements indicate that the conduction-band offsets at both PANI/ZnS and ZnS/ZnO interfaces show type-ii alignment with values of 0.54 ev and 0.41 ev, respectively. Our results suggest that, although type-ii alignment for PANI/ZnS heterojunction can form less of a barrier to electron transport across the interfaces, the narrowing of the interface barrier increases recombination of carriers. P3-G2-34 Flexible Thin Film Batteries for Power Source of Smart Lens 스마트렌즈의전력원으로사용하기위한유연박막전지이현석 1*, PARMAR NARENDRA SINGH 1, 김광범 2, 최지원 1. 1 한국과학기술연구원, 2 연세대학교 Recently bio-sensor based devices for diverse health monitoring system have been attention. Several requirements should be satisfied in order for devices which are attached on a human body to remote health monitoring and environmental conditions. Firstly, it has to be transmitted and detected the signals. Second, energy storage devices are required in order that a bio-devices implement remote monitoring. Thus, a battery that can be charged and discharged will be needed. Lastly and most importantly, the energy storage devices should be flexible due to be attached on contact lens. So far, there is no report in the literature about applying energy storage devices to contact lens even though many research groups have issued various reports about smart lens. We have researched lithium ion secondary batteries as power source to operate glucose sensor in smart lens. In this study, we fabricated flexible thin film batteries on polyimide substrate. Flexible thin film batteries with olivine cathode materials were fabricated by radio frequency (RF) magnetron sputtering. The flexible thin films battery on contact lens exhibit the 25 μwh discharge power. P3-G3-1 Evaluation of Indentation Characteristics of Double Layer Thermal Barrier Coatings after Thermal Shock 란타늄 / 가돌리늄지르코네이트이중열차폐코팅의열충격후압입특성평가최소담 1*, 이기성 1, 김태우 1, 김성원 2, 오윤석 2, 김형태 2. 1 국민대학교, 2 한국세라믹기술원오늘날발전용가스터빈과항공용엔진에주로사용되고있는열차폐코팅 (TBC) 은높은온도에서모재의변형을막아보호하므로터빈의작동가능온도를높여주는역할을하고있다. 이러한열차폐코팅은터빈의효율을위해터빈의작동온도가높아짐에따라 한국세라믹학회 201

222 2017 년한국세라믹학회추계연구발표회 그중요도가증가하고있으며, 이에따라열차폐코팅의소재와공정들에대한연구가활발히진행되고있다. 현재열차폐코팅은주로모재위에본드코팅층과탑코팅층이차례로적층되는구조를사용하고있으며, 소재는주로안정화지르코니아 (YSZ) 를사용하고있다. 하지만안정화지르코니아는 1200 o C 이상이되면상분리가일어나기때문에, 이를보안하기위해높은온도에서상변화가거의없는란타늄 / 가돌리늄지르코니아계 (LGZ) 의소재연구가이루어지고있다. 하지만 LGZ 의소재는모재와의열팽창계수차이가상대적으로크므로열이가해졌을때모재와의팽창차이로박리에취약하다는단점이있다. 이에따라본연구에서는 LGZ 의열팽창계수를고려해 YSZ 과함께이중의코팅재를도입하여시편을제작하여특성평가를실시하였다. 이중층구조의효용성을알기위해 YSZ 단층구조로코팅된두가지시편과함께비교하였으며, 1350 o C 의온도 1100 사이클의열충격전후구형압입법을통한탄성평가와, 다이아몬드압입을통한경도평가를실시하였다. 이를통해 LGZ 이중코팅의가능성을확인해보았다. P3-G3-2 Manufacture and Mechanical Properties of SiC Seal for Manufacturing Mechanical Seals by Pressureless Sintering 상압소결에의한메카니컬씰제조용 SiC 씰제조및기계적특성평가서정민 *, 김우식, 신동근, 조광연, 도환수. 한국세라믹기술원 Mechanical Seal이란기계식밀봉장치로 Pump 등의기기내에서누수를방지하는역할로일반산업용외에석유화학, 발전소, 원자력등다양한분야에서사용된다. Silicon carbide( 탄화규소, SiC) seal은내화학성, 경도, 내마모성등기계적, 열적특성이우수하고자체윤활성이높아재질선택이확대되는우수한소재이다. 우수한화학안정성으로인해고온, 고진공, 고응력과같은극한환경하에서사용이가능하다. 본연구에서는 SiC Mechanical Seal 소결체의기계적특성을향상시키고제조공정의간소화를위하여 B4C를소결조제로첨가후분말을과립화하여 granule 형태로제조한후 140 MPa 압력을가하고 2200 o C에서 Ar분위기 6시간유지하여상압소결을한결과약 90~95% 의치밀화를갖는소결체를얻었다. 실온에서꺽임강도는약 340 MPa, 경도는 2400hv, 내마모성은비마모량이마찰계수는최대 최소 0.059의결과를얻을수있었다. P3-G3-3 Fabrication of Y 2 O 3 -MgO Nanocomposite by Carbon contamination-free Spark Plasma Sintering with Tungsten Punch 텅스텐펀치를이용한탄소침탄이억제된 Y 2 O 3 -MgO 복합재의방전플라즈마소결김홍래 *, 홍성현. 서울대학교 Polycrystalline transparent ceramics, such as MgO, MgAl 2 O 4 and Y 2 O 3 have drawn lots of attention due to their excellent optical, mechanical, and thermal properties. Among them, Y 2 O 3 and MgO have a longer wavelength cutoff and lower emissivity than other midinfrared materials. In addition, Y 2 O 3 -MgO nanocomposite below 150 nm grain size tends to exhibit superior mid-infrared transparency, mechanical strength and thermal shock resistance than those singlephase optical ceramics because the presence of one phase naturally impedes the grain growth of the adjacent phases, giving rise to the reduced grain size. In the fabrication process of Y 2 O 3 -MgO nanocomposite, grain growth should be suppressed to achieve high transparency. For this reason, spark plasma sintering (SPS) was applied in an attempt to make nanocomposite with 100 nm grain size due to low sintering temperature and short process time. However, SPS process required a post annealing process to negate the bad effect of carbon contamination resulting from its carbon-rich environment; graphite die. Although the incorporated carbon can be transformed into CO or CO 2 bubbles during post annealing process, it can cause optical degradation due to the associated pores. I n this study, Y 2 O 3 -MgO nanocomposite ceramic was fabricated via SPS process to suppress the carbon contamination by introducing BN-coated tungsten punch instead of the conventional graphite punch. It exhibited a high mid-infrared transparency without extra postannealing process. P3-G3-4 Physical Properties of Silane doped SiC Diesel Particulate Filter (DPF) Bonding Materials 실란첨가에따른디젤매연저감장치 (DPF) 용접합제물성변화김진원 *, 홍동민, 한성진. ( 주 ) 아이비머티리얼즈 Diesel Particulate Filter (DPF) 란디젤엔진의배출가스중매연을저감시키는매우효과적인장치이다. 이러한 DPF는형태와소재에따라크게구분되는데이중 SiC를기반으로하는 DPF는다른소재의 DPF에비해우수한내열특성과높은여과효율을가짐에도불구하고높은열팽창계수로인한단일허니컴 (honeycomb) 의일체형으로제조가불가능하다. 이에 SiC DPF는세그먼트 (Segment) 단위로제작하고각세그먼트를세라믹접합제를이용하여접합후완제품을제조하는방식이널리이용되는데이때사용되는세라믹접합제의소재물성에의해 SiC DPF의열적, 물리적성능이일부결정한다. 본연구에서는 SiC DPF의접합제의물성을향상시키기위해접착증진제인트리메톡시실란을첨가하였으며이에따른접합재의물성변화를비교평가하다. 제조된접합제는 X-ray 회절분석법 (XRD) 와주사전자현미경 (SEM), X-선형광분석 (EDS) 을이용하여결정성및미세구조, 성분원소의변화를확인하였으며 SiC DPF 의내열충격성에영향을주는요인중하나인열팽창계수와 ASTM C 1161 규정에따른 3점굽힙강도와 4점굽힙강도를이용하여강도및접합력을비교평가하였다. P3-G3-5 Effect of Fumed Silica Slurry Viscosity on the Characteristics of the Granule 흄드실리카슬러리점도의과립특성에미치는영향조상근 *, 오현명, 이현권. 금오공과대학교현재반도체공정에적용되는고순도석영유리부재는하나의형태만으로구성될수없기때문에다양한형상제조를위한기술개발이요구되고있다. 이와관련되어나노급실리카원료분말을과립화함으로써분체에유동성과높은충진성을부여하는연구가진행되고있다. 특히, flame 법에의해제조되는흄드실리카의경우나노입자가망상구조로응집되어형성되기때문에과립이필수적이다. 일반적인과립제조는슬러리로부터출발하여과립을제조하는방식이므로필연적으로슬러리의특성이최종과립특성에큰영향을미치게된다. 따라서, 본연구에서는원료분말로나노급흄드실리카를사용하고분말및첨가제의함량, 볼밀시간등을변수로하여그에따른슬러리점도가과립특성에미치는영향을파악하고자하였다. 실험은조건에따라제조된슬러리의점도를측정하고그로부터얻어진과립의특성을탭밀도, 입도분석, SEM 이미지분석을통해평가및분석하였다. 202 한국세라믹학회

223 포스터발표 III P3-G3-6 Effect of Ball-mixing Ratio on the Miling Effeciency of Alumina Powders 볼혼합비가알루미나분말밀링효율에미치는영향김재홍 *, 박의근, 이현권. 금오공과대학교현대공업에서고순도세라믹스를제조하기위한미세분말의제조는매우중요한요소이다. 분쇄는기계적인힘을통해미세분말을만드는작업으로서일반적으로공정비용이저렴하고다양한재료를쉽게다룰수있는볼밀링이소재분야에서널리채택되고있다. 볼밀링시분말의밀링효율은밀링조건에큰영향을받으며, 이는주어진시간내에미세하고균질한세라믹분말을제조해야하는현업에서매우큰관심사이다. 이에따라세라믹분야에서분쇄에관한연구가지속적으로진행되고있다. 본연구에서는서로다른크기의볼을혼합하여최적분쇄효율을제시하고자하였다. 상업적으로많이사용되고있는알루미나분말을원료분말로사용하고, 서로다른크기의알루미나볼 (3 mm, 5 mm, 10 mm) 을사용하여배합비에따른분쇄효율을측정하였다. 이후, 분쇄된분말을비교분석하여볼혼합비와분쇄효율의상관관계를평가하고분석하였다. P3-G3-7 Effect of Current on the Microstructure and Mechanical Properties of Spark Plasma Sintered Si 3 N 4 통전소결된질화규소세라믹에미치는전류의영향류종훈 *, 조준영, SIYAR MUHAMMAD, 남재현, 지상구, 진우찬, 박찬. 서울대학교 Silicon nitride (Si 3 N 4 ) is a promising structural ceramic due to its excellent mechanical strength, hardness and good chemical stability at high temperature. Two well-known commercial methods used to make dense Si 3 N 4 bulk are hot pressing (HP) and conventional sintering. Full densification of Si 3 N 4 is difficult due to the strong covalent nature of Si-N bonds, which can impose low self-diffusion coefficient and high temperature for sintering. Spark plasma sintering (SPS), which consists of uniaxial pressure and heating by a pulsed electric current passing through the die that contains powder, can be used to obtain dense Si 3 N 4 in a short time and at relatively low temperature compared to commercial sintering methods. Many studies on the high density of Si 3 N 4 obtained by SPS were reported, but the mechanism of the sintering process of Si 3 N 4 during SPS is still under discussion. In this study, the effect of current on the mechanical properties and microstructure of spark plasma sintered Si 3 N 4 was investigated. The bulk Si 3 N 4 samples were fabricated by SPS and HP with same sintering conditions, which include temperature, time and pressure. The phase, microstructure and mechanical properties of sintered Si 3 N 4 bulk samples made using the two processes will be compared, and the effect of current on the microstructure and mechanical properties of Si 3 N 4 will be discussed. P3-G3-8 Effect of Annealing on the Mechanical Property Changes on TaC Films Fabricated by LPCVD 저압화학기상증착법으로제조된 TaC 박막에열처리가기계적물성변화에미치는영향한장원 1*, 김대종 2, 박지연 2, 이현근 2, 박찬 1, 김원주 2. 1 서울대학교, 2 한국원자력연구원 Ultra High Temperature Ceramics (UHTCs) are been used as structural materials or coating materials in extremely high temperature required environments such as space rockets or nuclear applications. Refractory (Si, Zr, Ta, Hf etc) carbides are the candidates for these applications and tantalum carbide (TaC) is one of the widely used UHTCs material with its stable properties in ultra high temperature region. Recently, there have been efforts to lower the deposition temperature of UHTC materials. Low Pressure Chemical Vapor Deposition (LPCVD) methods are performed in relatively lower temperature region including the similar properties which has been fabricated in the high temperature region. TaC was deposited on graphite disc by LPCVD method with TaCl 5 -C 3 H 6 -H 2 -Ar system. Annealing was carried out at 1850 o C for 4 h under Ar condition. The advantage of annealing is that, it is easy to adjust the crystallinity of materials. The phase and microstructures of the thin films were analyzed by XRD and SEM. In this study, we have investigated the influence of annealing and the changes in mechanical property of TaC thin films. The results will be presented and discussed. P3-G3-9 Rapid Consolidation of AlN-graphene Composite and its Mechanical Properties AlN-그래핀복합재료급속소결과기계적성질에관한연구손인진 *, 조우진. 전북대학교 Pure AlN can be expected for using as packing components and engine materials for high power integrated circuits as a result of its high temperature stability, excellent corrosion resistance, high thermal conductivity, low density, excellent electrical insulation, thermal expansion coefficient close to that of Si. However, its low fracture toughness at room temperature limits for wide application in industry. Its drawback is low fracture toughness for wide application in industry. The fracture toughness of AlN can be improved using fabrication of nanostructured composite materials. In this regard, nearly full density of nanostructured AlN-graphene composites were sintered within short time using pulsed current activated heating. The mechanical properties (hardness and fracture toughness) and microstructures of AlN and AlN-graphene composites were observed using FE-SEM and Vickers hardness tester and also compared respectively. Both hardness and fracture toughness increased simultaneously by the addition of graphene to AlN because of grain refinement of AlN and blocking crack propagation by the addition of graphene. P3-G3-10 Mechanical Properties and Consolidation of Nanostructured Nb 2 C-Al 2 O 3 Composite 나노구조의 Nb 2 C-Al 2 O 3 복합재료치밀화와기계적성질에관한연구손인진 *, 박근오. 전북대학교 In spite of many attractive properties of niobium carbide, the drawback of metal carbide is low fracture toughness to use wide applications. To fabricate nanostructured composite is common method to improve fracture toughness. Nanopowders of Nb 2 C and Al 2 O 3 synthesized mechanochemically according to the reaction (Al 4 C Nb + 3O 2 3Nb 2 C + 2 Al 2 O 3 ) from Al 4 C 3 and Nb powders by high-energy ball milling. The synthesized powders were consolidated by pulsed current activated sintering method within two min under the 80 Mpa pressure. Nb 2 C and Al 2 O 3 in composite sintered by rapid heating consist of nanophase. The fracture toughness of a 한국세라믹학회 203

224 2017 년한국세라믹학회추계연구발표회 nanostructured Nb 2 C-Al 2 O 3 composite of this study is better than that of previous study. P3-G3-11 Thermal Properties of C Fiber-Reinforced SiC Composites 카본섬유강화탄화규소복합재료의열적특성김현민 1*, 김영욱 1, 임동원 2. 1 서울시립대학교, 2 ( 주 ) 데크카본 Ceramic matrix composites (CMC), based on reinforcements of carbon fibers and matrices of silicon carbide is the most important CMCs for brake disk applications. For the brake disk applications, control of the thermal properties as well as the improvement of mechanical properties of C fiber-sic composites (C/SiC composites) is the most critical issues for the applications. In the presentation, the effect of additives on thermal properties of C/SiC composites were investigated. The thermal conductivity of C/SiC composites increased with increasing additive content. However, the thermal conductivity decreased with icreasing the sintering temperature. Maximum value of thermal conductivity achieved is two times higher than that of the C/SiC composites without additves. Sintered density and thermal conductivity of C/SiC composites with 10~30 wt% additives were ~2.5 g/cm 3 and ~37 W/(m k), respectively. P3-G3-12 Sintering Behavior and Dopant Effect in Y 2 O 3 도펀트첨가에따른 Y 2 O 3 세라믹스의소결거동김창훈 *, 이정아, 허영우, 이준형, 김정주. 경북대학교할로겐족플라즈마에저항을갖는 Y 2 O 3 세라믹스는반도체 dry etching장비의 chuck등내부부품으로응용이가능하다. 또한 vacuum sintering, HIP, HP등특수한조건에서소결을진행하였을때 Y 2 O 3 는투명하게제작이가능하다. 하지만 Y 2 O 3 는녹는점이 2425 o C로매우높고소결온도또한 1600 o C 이상으로고온의가혹한조건의공정이필요하다. Two-step sintering 그리고 Y 2 O 3 에다양한 dopant를첨가하여고온의소결온도를낮추려는시도가많이보고되어있다. 본실험에서는 Y 2 O 3 에 2가의양이온과 4가의양이온을 co-doping하여 1400 o C dhseh, Air분위기에서소결을진행하였다. 각각 Y 2 O 3 세라믹스의소결거동과미세구조변화를관찰하였으며, FE-SEM, XRD, dilatometer를이용하여각각미세구조, 상분석, 수축거동, 밀도, plasma etching성을관찰하였다. P3-G3-13 Microstructure and Thermal Conductivity of Sintered Reaction Bonded Silicon Nitride with : Effect of Classification of Si Powder and Additives Size 분급된실리콘분말과소결조제크기에의한질화규소세라믹의미세구조와열전도도연구고신일 1*, 김하늘 2, 김진명 2, 고재웅 2, 박영조 2, 권세훈 1. 1 부산대학교, 2 재료연구소 Yttria and magnesia are contributed to the densification by LPS (liquid phase sintering) as a sintering agent in silicon nitride ceramic. LPS is able to make a sintered body superior in mechanical and thermal properties when promoted grain growth of β-silicon nitride by control of microstructure. In this study, silicon powder and sintering additive was pulverized using a high-energy mill for 12 h. Pulverized silicon powder was classified to remove coarse powder (above D 90 ) using a centrifuge. Then prepared specimens by each condition was nitrided at 1450 o C and sintered at 1900 o C for 6 h under 0.9 MPa N 2. When using a SEM was observed a microstructure of each sample, it confirmed the development of the microstructure of the specimen with a silicon powder of classifying and a sintering additive as a raw state. Also, thermal conductivity is affected by microstructural change and in this study we have obtained highest 88 W/mK. P3-G3-14 Preparation of Cermet by Carburization of Titanium Alloy 타이타늄합금에대한탄화과정을통한서메트제조권한중 1*, 문아람 2, 서창열 1. 1 한국지질자원연구원, 2 과학기술연합대학원대학교 (UST) 서메트는절삭공구중텅스텐탄화물과코발트로제조되는초경소재와달리타이타늄탄질화물과니켈로구성된복합체를말한다. 서메트제조는니켈이액상이되는온도에서소결하는액상소결법에의해이루어지는데이때액상이된니켈은타이타늄탄질화물분말사이기공을채우게되고이러한과정을통해치밀화된서메트가제조된다. 하지만타이타늄의높은산화친화력으로인하여타이타늄탄질화물과액상니켈간적심성은좋지못하고결과적으로액상니켈이타이타늄탄질화물사이기공을완벽하게채우는것은쉽지않은일이다. 이연구에서는타이타늄합금에대한탄화를통해타이타늄탄질화물과금속이균일하게혼합되어있는분말을제조하고이를소결하여건전한조직을갖는서메트를제조하는것을목표로하였다. P3-G3-15 Deposition and Characterization of Carbon-controlled SiC-coated Layer by Chemical Vapor Deposition for Improving Surface Quality of Graphite Mould CVD법을이용한 SiC 코팅층형성및카본조절을통한그라파이트금형막질개선에관한연구김경호 1*, 황국진 1, 이희수 2, 임성실 3, 배시영 1, 이명현 1. 1 한국세라믹기술원, 2 부산대학교, 3 제너코트최근스마트폰의곡면형디자인의보급과함께 3차원유리성형기술이대두되고있다. 이러한비평면유리의성형을위해서는재료의가공성과함께 700도이상의고온에서의내구성, 낮은표면조도 (< 100 nm), 긴공정수명이가능한내마모성 (> 2000회 ) 등의요구조건을만족시킬수있는금형의제작이필요하다. 이를위해본연구에서는통상사용되어오던그라파이트금형의막질을개선한 SiC 기반세라믹복합체형성및분석을진행하였다. SiC 기반코팅층의증착및카본의조절은화학적기상증착법 (CVD) 법을이용하였다. 기본공정은 Methyltrichlorolsilane (MTS) 와수소를각각 50 sccm을주입하고약 1250도의온도에서 SiC층을증착하였고, 카본의조절을위하여주입소스량및성장온도를변화시켰다. 증착된세라믹복합체의특성을평가하기위하여 XRD, SEM 및표면조도를측정하여비교하였다. 그후 SiC 코팅된그라파이트블록을이용하여글라스의자중접합을테스트를통해증착된코팅레이어의유효성을확인하였다. 따라서, 본연구는높은내구성과탈착력을갖는세라믹그라파이트복합체개발을통해스마트기기의 3차원윈도우산업에기여할것으로보인다. P3-G3-16 Thermal and Mechanical Properties of Additives doped Large Grain UO 2 Pellet 첨가제가도핑된큰결정립 UO 2 소결체의열적, 기계적특성평가오장수 *, 김건식, 김동주, 김종헌, 김동석, 양재호. 한국원자력연구원원자력발전의경제성을증가시키기위해서는고연소도핵연료의개발이필요하다. 핵연료의연소도를높이면우라늄자원이절약되고동시에핵연료주기비가절감되기때문에핵연료의경제성 204 한국세라믹학회

225 포스터발표 III 이향상된다. 연소도의증가는빠른출력변화, 순간적인고출력등의가혹한운전환경이요구된다. 이와같은운전환경에서는핵연료소결체에서발생한핵분열생성물에의해핵연료봉특성이열화되고급격한출력변동에의해소결체가팽창하여피복관에응력이가해져피복관의변형이핵연료안전성을저해하는요인이다. 이를해결하기위해서핵분열생성물의방출이적고출력변화시부피변화를최소화하여핵연료봉의 PCI (Pellet-Clading Interaction) 특성이개선된소결체개발이요구된다. PCI 특성을개선하기위해서는핵분열기체방출을억제할수있고소결체가쉽게변형이일어나피복관에가하는응력을완화시켜 PCI 에의한파손을줄일수있어야한다. 이두가지특성은큰결정립소결체개발로이룰수있다. 큰결정립소결체는가소성과핵분열기체방출완화능력을향상시킨다. UO 2 소결체의결정립을증가시키는다양한공정변수는첨가제, 소결온도, 소결시간, 소결분위기등이있다. 그중에서첨가제를사용하는방법이널리연구되어왔다. 본연구에서는첨가제를이용하여큰결정립을가지는소결체를제조하고이에대한열적, 기계적특성을평가하였다. P3-G3-17 Development Status of Microcell UO 2 Fuel Pellet for Accident Tolerant Fuel 사고저항성핵연료미소셀 UO 2 소결체개발현황김동주 *, 김건식, 김동석, 오장수, 김종헌, 양재호. 한국원자력연구원 2011년일본후쿠시마원전사고이후, 핵연료개발방향은경제성뿐아니라안전성향상으로흐름이변화되었다. 세계각국은핵연료안전성향상을위한사고저항성핵연료 (Accident Tolerant Fuel, ATF) 의독창적인개념및기술개발을활발히진행중이다. 한국원자력연구원에서는독창적인사고저항성핵연료개념중하나로써미소셀 UO 2 소결체 (Microcell UO 2 fuel pellet) 개발을진행중이다. 미소셀 UO 2 소결체는기존의 UO 2 소결체내에금속또는세라믹그물망을배열하여, 열전도도를증가시키거나핵분열생성물 (Fission product) 을포획하는기능을갖도록하는것이다. 이를통하여, 핵연료사고전개를지연및완화시켜중대사고발생확률저감에기여할수있다. 개발중인미소셀 UO 2 소결체에대하여해외연구로연소시험을진행중이며, 온라인데이터측정을통하여그우수성이확인되고있다. 본발표에서는사고저항성핵연료미소셀 UO 2 소결체개발현황및결과를소개하고자한다. P3-G3-18 Molecular Weight and Content of PVA on the Properties and Sintering Behavior of Nano Yttria Powder Prepared by PVA Solution Route PVA 중합도및첨가량이폴리머용액법으로제조된나노 Yttria 분말의특성및소결거동에미치는영향양영균 *, 이상진. 국립목포대학교이트리아는높은융점과고온안정성을보이며고온까지상전이가일어나지않는다. 이러한특성때문에이트리아는고온내화학성기판, 반응성금속용해용도가니와노즐등광범위한응용분야를가지고있다. 광학및투명이트리아세라믹은넓은범위의적외선투과성을보이며, 이러한특성들로인하여적외선센서및레이저뿐만아니라미사일보호용돔을개발하는데이상적인소재로각광받고있다. 일반적으로투명이트리아소결체를얻기위해서는고온의열처리가요구되나, 높은비표면적의나노크기이트리아분말을사용하면소결온도를낮출수있었다. 또한입자크기의조절로인한투광성조절도가능하다. 본연구에서는 PVA (Polyvinyl Alcohol) 을양이온분산제로사용하는고분자용액법을이용하여비교적간단한공정으로낮은열처리온도에서단시간 에입도가균일한이트리아초미세분말을제조하였다. 약 20 nm 이하의크기와 50 m 2 /g 이상의비표면적을갖는이트리아분말의합성이가능하였으며, 1600 C 상압소결에의해 99.5% 이상의상대밀도를갖는이트리아소결체를얻을수있었다. 하지만, 미량의기공과입도의불균일성에의해우수한투광성에는어느정도제한이따랐다. 이를개선하고자 PVA 중합도와첨가량을달리하여합성된나노이트리아분말의특성에미치는영향을알아보고, 합성된나노분말을이용한소결을통하여치밀화및투광성향상을꾀하고자하였다. P3-G3-19 Effect of Mixing Ratios of Alkali Stimulants with Sodium Silicate Solutions on the Properties of Geopolymer Ceramics 알칼리자극제와소듐계물유리의혼합비율이지오폴리머의물성에미치는영향 CHEN ZHILEI *, 강태성, 이상진. 국립목포대학교지오폴리머 (Geopolymer) 는알루미노실리케이트계원료와강알칼리자극제의탈수축중합반응을이용하여보다친환경적이고공정비용이비교적저렴한소재로일부국가에서건축소재로이용되기도한다. 최근이같은친환경적인특성으로인해관련연구가활발하게진행되고있으나, 이들대부분이공정개선및강도개선방법에그치는경우가많다. 본연구에서는메타카올린을사용한지오폴리머에촉매의역할을하는알칼리자극제 (40 wt% KOH solution) 와물유리 (Sodium silicate solution) 의혼합비율에변화를주고이에대한물성변화를고찰하였다. 미분쇄된카올린분말을열처리하여메타상으로제조하고이를실험에이용하였다. 연구의변수를최소화하기위해분말과혼합용액 ( 알칼리자극제와물유리의혼합용액 ) 의비율을 100 : 75로고정하였으며, 알칼리자극제는 40 wt% 의 KOH 수용액을이용하였다. 알칼리자극제와물유리의혼합용액의양을일정하게고정하고이들의비율에변화를줄때, 물유리의비율이높을수록최대 10% 미만의선형수축율을보였다. 이에반해알칼리자극제의비율이높은경우, 경화속도가감소하였으며, 시편의수축이일어나지않았다. 이같은경향을중심으로각조건에따른시편의기공율, 압축강도, 미세구조등물성을고찰하였다. P3-G3-20 Mechanical Properties of Ceramic-polymer Composites by Addidtion of Ceramic 세라믹첨가에따른세라믹-폴리머복합체의기계적특성조용현 1*, 박주석 1, 이성갑 2, 김경훈 1. 1 한국세라믹기술원, 2 경상대학교 Life expectancy has been increasing due to improved quality of life and medical technology, while interest in toothe restoration has been increasing in patients with prior/acquired tooth defect. Recently, dental treatment of toth defect patients has been mainly performed through tooth restoration using artificial teeth. In this process, the gap between the natural tooth and the zirconia crown is reported to be a problem. To solve this problem, a method of injection resin into the gap between the natural tooth and the zirconia crown is widely used. However, the resin (for natural teeth) used at this time, there is separated due to lack of bonding with the zirconia crown, and resulting in re-operation due to low durability and thus lead to decrease in satisfaction and reliability of the tooth restoration procedure. Accordingly, it is necessary to develop a zirconia bonding resin which can be used semi-permanently by preventing separation from zirconia crown and improving mechanical properties. In this study, semi-solid composite resin was firstly prepared by 한국세라믹학회 205

226 2017 년한국세라믹학회추계연구발표회 stirring and defoaming with liquid polymer and ceramic powder under vacuum condition. Finally, composite resin was prepared by photopolymerization using ultraviolet light. To characterize the ceramic-polymer composite resin, bulk density, 3-point bending strength, wear resistance, vickers hardness, bond strength to zirconia block, shrinkage ratio were employed. P3-G3-21 Fabrication of a UO 2 Nuclear Fuel Pellet with Metallic Micro-Cell Structure using Mo Platelet Mo platelet을사용한금속미소셀구조 UO 2 핵연료소결체제조김동석 *, 김동주, 오장수, 김건식, 김종헌, 양재호. 한국원자력연구원경수로핵연료개발에있어 UO 2 핵연료소결체의열전도도향상은가장중요한연구목표중하나이다. 열전도도향상으로얻을수있는이점은소결체내부의온도구배완화및감소된운전온도로인한열응력완화, 핵분열생성물감소, 그리고원자로운전과안전에대한마진의증가를들수있다. 특히최근동향은핵연료의안전을보다중시하는추세로, 사고저항성핵연료 (Accident Tolerant Fuel, ATF) 의개발에전세계적으로중점을두고있다. 본연구에서는, UO 2 핵연료소결체의열전도도증가를위하여, Mo platelet을이용하여미소셀구조를지닌핵연료소결체를제조하였다. Mo platelet 분말로둘러쌓인 UO 2 그래뉼들이압착된미소셀형태로써, 셀벽을이루고있는 Mo 금속이연속적인연결망을구성하여효과적으로열을전달, 방출할수있는미세구조를형성하였다. 이와같이제조된미소셀핵연료소결체의미세구조분석과함께열전도도향상에대해살펴보았으며, 사용된 Mo platelet 의크기에대한영향또한살펴보았다. P3-G3-22 SiO 2 Coating Layer Formation of Complex Structure by CTAB Functionalization of Fe 3 O 4 Superparamagnetic Nanoparticles with Core-shell Structure 코어쉘구조를갖는 Fe 3 O 4 초상자성나노입자의 CTAB 기능화를통한복잡구조의 SiO 2 코팅층형성채동호 1*, 안계석 2, 신재록 1, 이현승 1, 최성철 1. 1 한양대학교, 2 한국세라믹기술원초상자성나노입자의의학및산업분야와같은광범위한분야에적용을위해초상자성입자를기반으로하는연구가지속적으로진행되고있다. 특히, 화학적안정성을갖는동시에초상자성거동을갖는대표적인입자인 Fe 3 O 4 입자의연구가대표적으로이루어지고있다. 본연구에선 Sol-gel 방법을적용해서 Fe 3 O 4 나노입자에 SiO 2 코팅층을형성을통해코어쉘구조를구성하였으며, CTAB 전처리과정을거쳐 porous한 SiO 2 코팅층을형성하여코어쉘구조를형성하였다. TEOS precursor를통한 SiO 2 코팅층형성을통해입자의정전기적반발력을유발하여 Fe 3 O 4 의 agglomeration 현상을방지하였다. 더불어, CTAB 전처리를통해표면의 amine group 을통해입자의전기적특성을초래하여 porous한 SiO 2 코팅층을형성하였다. CTAB 전처리과정을거친 Fe 3 O 2 입자와전처리과정을거치지않은코어쉘나노입자를비교하였다. 표면전하특성을확인하기위해 Zeta potential을측정했고, FT-IR을통해표면의기능기를확인했다. 또한, 코어쉘형상및코팅층의두께를확인하기위해 TEM을측정하였으며마지막으로 Fe 3 O 4 입자의자기적특성을분석하기위해 VSM을측정하였다. P3-G3-23 Mechanism of Bonding Reaction of Au Double Metal to Fe 3 O 4 /NH 2 Nanoparticles Surface-functionalized by Sol-gel Method Sol-gel 법에의해표면기능화된 Fe 3 O 4 /NH 2 나노입자에 Au 이중금속의접합반응메커니즘연구김태균 1*, 안계석 2, 이현승 1, 한진순 1, 허재욱 1, 최성철 1. 1 한양대학교, 2 한국세라믹기술원초상자성나노입자 (Fe 3 O 4 ) 에 Au 이중금속이선택적으로결합된복합물질은 quantum dot 과같은형광물질의접합을통해바이오이미징, 바이오센싱, 발열치료등질병을조기에진단, 검진, 치료할수있는테라그노시스 (Theragnosis) 에적합한소재로주목받고있다. Fe 3 O 4 /Au 의형태로이중금속의접합을위해서는 Fe 3 O 4 표면에충분한양의양 (+) 전하가필수로수반되어야한다. 양전하의형성은 Amine(NH 2 ) functionalization 을통해유도할수있으며, 대표적인 Amine 형성전구체는실레인계열의무기바인더 APTES((3- Aminopropyl)triethoxysil) 와고분자계열의 PEI (polyethyleneimine) 의물질을통한형성이가능하다. 본연구에서는입자합성, 코팅, 표면기능화의많은장점을보유한 sol-gel 합성법을도입하여수용성용매하암모니아 (NH 4 OH) 촉매를통해 Hydrolysis 와 Condensation 의반응을유발하였다. 입자표면에안정적이고충분한양의양전하를갖는 Amine 기능기부착은음 ( ) 전하특성을갖는 Au 와정전기적인력 (Electrostatic attraction) 을통해이중금속과결합이가능했다. 부착된기능성 Amine 그룹은 Fourier Transform Infrared (FT-IR) spectra 를통해 N-H 및 C-H 굽힘진동 peak 를통해부착유 / 무를판별하였으며, Zeta-potential 을통해표면음전하의특성과양전하의특성을분석하였다. 또한, FE-TEM (Field-Emission Transmission Electron Microscope) 을통해 Fe 3 O 4 /Au 의형상및결합여부를확인하였다. P3-G4-1 Mechanical Properties of 3D Printing Based Ceramic Mold and Core with Composite Starting Materials 복합출발물질이적용된 3D 프린팅기반세라믹주형및중자의기계적특성박혜영 *, 최현희, 김봉구, 이혜주, 조근호, 김은희, 정연길. 창원대학교최근 3D 프린팅공정과유기 무기바인더전환공정을결합한새로운세라믹주형및중자제작공정이제안되었으나출발입자의입도가큰경우, 시험편내많은기공으로인해충분한성형및소성강도를발현하지못하였다. 따라서, 본연구에서는출발입자로뮬라이트비드 ( 평균입도 : 250 um) 입자에비교적입도가작은뮬라이트분말 ( 평균입도 : 16 um) 와기계적특성이우수한지르콘플라워 ( 평균입도 : 43 um) 를혼합하여출발분말로적용하였으며, 이에따른성형및소성강도특성을향상시키고자하였다. 출발분말과분자량의차이가큰두가지의 poly vinyl alcohol (PVA) 수용액을혼합하여 3D 프린터로제작된시험편은저분자량의 PVA 를 250 C에서 4시간열처리하여제거하여무기바인더가코팅될공간을확보하였으며, 규산염과금속알콕사이드로구성된무기바인더전구체에침지한후 1000 C에서열처리를통해강도를발현시켰다. 출발분말의복합화를통해시험편의성형밀도는증가되었으며, 미세구조분석을통해기공감소를확인할수있었다. 한편, 출발분말의복합화와성형밀도의증가로인해무기바인더코팅효율증가와유리질전환효율의향상을가져왔으며, 이러한것은시험편의소성강도를향상시켰다. 본연구를통해 3D 프린팅공정에서출발분말의복합화와유기 무기바인더전환공정적용이우수한강도특성을갖는세라믹주형및중자의제조가가능함을확인할수있었다. 206 한국세라믹학회

227 포스터발표 III P3-G4-2 전기방사법을이용한자성나노섬유의제조와자기특성나경한 1*, 김완태 1, 박동철 2, 신현규 3, 최원열 1. 1 강릉원주대학교, 2 주식회사위드엠텍, 3 한국산업기술시험원최근전자공학의발달로인한일상및산업현장전반에서의사용기기고집적화와그에따른신호간섭차폐기술및스핀트로닉스를응용한새로운메모리소자기술등이조명받으면서, 그기반이되는자성재료역시주목받게되었다. 재료의자기특성은미세구조에큰영향을받는데, 이에나노기술을이용해미세구조를부여한자성복합재료에관한다양한연구가진행되고있다. 다양한형상의나노구조체를제조하기위한방법들로템플레이트법, 수열합성법, 양극산화법등이있으나 1차원의섬유상을얻기위한공정에는전기방사법이대면적제조의용이성, 빠른생산수율등의이점을갖는다. 전기방사법으로얻은나노섬유는재현성이높고큰종횡비를갖기때문에졸-겔반응을이용해세라믹나노섬유를제조하기위한방법에도응용되며연구성과의발표와보고도지속적으로증가하고있다. 본연구에서는전기방사를응용하여대표적강자성체인 Fe 2 O 3 나노섬유를균일하며재현성높게얻을수있는용액및전기적, 열처리조건을확인하고섬유의지름등형상에따라자화특성이어떻게달라지는지연구하였다. 미세구조는전계방출형주사전자현미경을이용하여관찰하였으며, XRD 분석결과를통해결정상을확인하였다. P3-G4-3 Drug Detection of Porous TiO 2 Arrays by Optical Interferometric Sensing 다공성 TiO 2 어레이의광간섭센싱에의한약물감지김완태 *, 나경한, 최원열. 강릉원주대학교양극산화법에의해제조되는다공성 TiO 2 어레이는수직정렬하고개방된기공구조와큰비표면적및광전특성을이용하여의료용재료, 산화물가스센서, 광간섭센서, 광촉매및수소생성과및유기태양전지의광전극등에사용된다. 이런다공성 TiO 2 어레이의양극산화공정을통한제조에서는다양한변수가작용하며각각의응용을위해변수의통제가중요하다. 또한, 이런양극산화를통해제조된다공성 TiO 2 어레이는박막에서일어나는 Fabry-Perot 효과로인해백색광으로부터간섭무늬를반사하고, 이런간섭무늬는다공층의굴절률같은광학적특성의변화에의해변하게된다. 따라서, 굴절률등에의한간섭무늬의상변화를이용하여바이오센서로응용이가능하다. 이연구에서는불소이온이과증류수가포함된유기전해액에서정전압공정으로제조된다공성 TiO 2 어레이를광간섭효과를일으키는박막층으로사용하였으며, 또한약물을탑재하는담체로사용하였다. 약물용출은 flow cell 안에서분석하였으며증류수수조안에서용출되는 alendronate sodium 을광학적으로측정하였고, 약 2 nm의 optical thickness 변화가 5 시간이상지속되는것으로분석되었다. P3-G4-4 A Mixing Ratio Optimization of Ball Mills With ZnS:Cu,Al for Size control by Ball Milling Method ZnS:Cu,Al의입도조절을위한볼밀의최적혼합비결정차지현 1*, 김은미 1, 오정표 2, 허기석 1. 1 한국생산기술연구원, 2 전남대학교광원으로주로사용되는무기형광체인 ZnS:Cu,Al 형광체입자의활용도를높이기위해, Ball Milling 방식을사용하여입자의크기를세분화하였다. 본연구에서는 ZnS:Cu,Al 분말의입도를미세화하기위해직경이 10 mm, 0.5 mm인 Ball을광구병에혼합하여에탄올과 Ball Milling을진행하였고, 이때두가지 Ball의최적혼합비를찾고자하였다. 이후에탄올을사용해분말을세척한후 24 시간동안 80 도의온도에건조하였다. 건조된분말을유발기를사용하여입자를고르게하는단계를진행하여세분화된입자를얻을수있었다. 혼합물실험계획법을이용하여최적의혼합비를적용한후입도를분석한결과, 평균입도는 μm 이고그표준편차는 로얻어졌다. P3-G4-5 Characteristics of Light Emitting Smart Window using the PDLC and ZnS:Cu 고분자분산액정과무기형광체를사용한발광가능한스마트윈도우제작및특성오정표 *, 김은미, 허기석. 한국생산기술연구원최근투과율조절기능이있는스마트윈도우가건물외벽, 스크린, 투명디스플레이, 태양광컨트롤러등전기-광학특성이필요한분야에주목받고있다. 특히고분자분산액정 (Polymer-dispersed liquid crystal; PDLC) 을사용한스마트윈도우는 electrochromic, thermochromic, photochromic 방식의스마트윈도우에비해구동속도가매우빠르고유연성기판등의스트레스가많이전달되는환경에적용할수있고제작방법이간단하며, 대면적제작이용이하기때문에스마트윈도우제작에많이사용되고있다. 이연구에서는고분자분산액정과무기형광체인 ZnS:Cu 를사용하여발광기능이포함된스마트윈도우를제작하고특성을분석하였다. 제작방법은발광기능이추가된 PDLC mixture를제작하고광경화방식을사용하여제작하였다. 실험변수는 PDLC에 ZnS:Cu 형광체첨가량에따라서제작하였고, 이때첨가량은 1.16 wt%, 2.88 wt%, 5.25 wt%, 8.11 wt%, wt% 였다. 제작된발광기능이추가된스마트윈도우의최대투과율은 Air 대비약 60 % 였으며, 최대발광세기는약 10 cd/m 2 으로측정되었다 P3-G4-6 Characteristics of Possibility Transmittance Control and Luminescence Smart Window 투과율조절및전계발광스마트윈도우제작및특성분석김은미 *, 오정표, 허기석. 한국생산기술연구원고분자분산액정 (Polymer-dispersed liquid crystal; PDLC) 을사용한스마트윈도우는제작이단순하고유연성기판을사용하여제작이가능하기때문에건축용유리, 투명디스플레이, 태양광컨트롤러등의전기-광학소자에서투과율조절이필요한분야에활용되고있고, 구동속도가빠르고, On-Off 투과율차이가크기때문에스마트윈도우로써주목받고있다. 이연구에서는고분자분산액정과무기형광체를사용하여발광기능이추가된 PDLC 스마트윈도우를제작하고전기-광학적특성을분석했고, PDLC에무기형광체를 0.5 wt%, 1 wt%, 3 wt%, 5 wt%,7 wt%, 9 wt% 첨가하는조건으로제작하였다. 이때 550 nm를기준으로투과율이가장높은시편은 0.5 wt% 였으며 Air 대비약 70% 였으며이때발광세기는약 5 cd/m 2 으로측정되었다. 이와같은결과는밝은환경에서 On/Off 동작을통해스마트윈도우기능을하며, 어두운환경에서간접조명으로활용할수있을것으로판단된다. P3-G4-7 MRI Signal Properties of Morphology and Size Hanging Gd(OH) 3 by the Various Types and Ratios of Solvents 자기공명영상의적용을위한용매와혼합비에따른수산화가돌리늄나노입자의크기및형상변화연구장호원 *, 박성준, 박진영, 양현경. 부경대학교 In recent years, the synthesis of inorganic micro- and nanostructure materials with tunable size and morphology with different dimensions (zero, one, two, and three) have received great attention because of 한국세라믹학회 207

228 2017 년한국세라믹학회추계연구발표회 unique and useful electronic, optical, and magnetic properties. The hydrothermal or solvothermal method is an important technology for the preparation of low dimension nanostructures. Solvents used in solvothermal have property from non-polar to polar and interact host materials. The morphology and size of materials is changed by the intensity of solvent polar. The Gd-based nanoparticles are promising multifunctional properties. The Gd 2 O 3 is also a useful host material because of its good chemical durability, thermal stability, and low phonon energy. In this research, Gd(NO 3 ) 3 phosphors were synthesized by a hydroand solvothermal method used in ethylene glycol, acetone, 2- propanol, toluene, and hexane as solvents, and each solvent added different ratio with mixed water (40/0, 30/10, 20/20, 10/30 and 0/40). A series of powders were characterized by X-ray diffraction (XRD) using a Philips X pert/mpd diffraction system with Cu-Kα radiation (λ = Å). The surface morphology of the powders were investigated with the field emission scanning electron microscopy (FE-SEM). The PL and PLE spectra of the prepared samples were recorded on a PTI (Photon Technology International) fluorimeter using a Xe-arc lamp. P3-G4-8 Study on Synthesis and Characterization of Morphology Controllable TiO 2 Nanoparticles Using AHFT by Solution Routes 신동윤 *, 이덕희, 박재량, 이찬기, 박경수. 고등기술연구원 TiO 2 is one of the most widely researched semiconducting metal oxides and it often used in various industrial fields such as photocatalyst, Li ion battery, solar cell (DSSCs/QDSSCs), sensor, pigments, cosmetics because of its unique structure, nontoxicity, low cost, chemical properties. Up to now, numerous studies have revealed that the performance of TiO 2 nanostructures is generally determined by the physical properties such as crystal structure, surface, morphologies and phase. Moreover, considerable efforts have been devoted to developing various TiO 2 nanostructure and morphologies of 0D to 3D and other hierarchical nanostructures using solutionbased routes including sol-gel, precipitation, hydrothermal, solvothermal and so on. Herein, various TiO 2 nanostructures were fabricated via facile precipitation and hydrothermal approach with ammonium hexafluorotitanate ((NH 4 ) 2 TiF 6, AHFT) as precursor. Field emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM) result showed that flower-like, hollow sphere, nanowire and nanotube of TiO 2 easily obtained. Also, we evaluated the effect of various experimental conditions such as temperature, reaction time, solvent, etc. Based on the results, we propose the synthesis possibility of TiO 2 nanostructure using AHFT as raw material. P3-G4-9 Synthesis of High Purity Tungsten Oxide Nanopowder by RF Induction Thermal Plasma 신동윤 *, 박경수. 고등기술연구원텅스텐은각종산업에서사용되고있는희소금속으로서모든금속원소중가장녹는점이높은고융점 (3,695 K) 금속이며높은밀도 (19.26 g/cm 3 ) 를가지고전성과연성이뛰어나다. 또한고온열적특성, 강도및내마모성이우수하여초경합금, 필라멘트, 용접용전극, 전기 전자부품재료등에널리사용되고있다. 최근들어 나노스케일의금속혹은금속산화물은전기소자, 광학소자등으로의응용을위해다양한형태의나노구조체개발연구가이루어지고있으며그중에서도텅스텐산화물은전기변색소자, 가스센서, 광촉매등으로의응용가능성이매우뛰어나나노재료개발및특성평가연구에많은관심을끌고있다. 본연구에서는고온플라즈마공정을통하여산화텅스텐 (WO 3 ) 마이크로분말의기화 - 급속냉각을거쳐산화텅스텐나노입자를제조하였으며실험결과분말은 XRD, SEM, TEM 을이용하여결정상, 조직, 성분분석을실시하였다. P3-G4-10 A Study on Fabrication of TiO 2 -SiO 2 Core-Shell Nanocomposite and Photocatalytic Characterization 신동윤 *, 이덕희, 박재량. 고등기술연구원광촉매는빛에의해반응성이높은활성종을생성하여휘발성유기화합물의분해나살균등환경정화목적으로널리사용되고있다. 대표적인광촉매소재로널리이용되고있는 TiO 2 는굴절률이높고광학적성질이우수하여폭넓게사용되고있으나효율이낮고이용할수있는빛이자외선영역으로제한적이다. 본연구에서는졸-겔법을통해상용 TiO 2 나노분말에 SiO 2 를코팅시킴으로써 TiO 2 -SiO 2 core-shell 나노복합체를제조하였다. 졸-겔공정은다른방법에비하여분말입자의크기가미세하고저온에서분말입자를얻을수있는장점이있고, 종래의용융법등에서만들수없는새로운조성의세라믹스를만들수있는특성을가지고있다. 졸-겔코팅을위해전구체종류, 촉매, 온도등여러실험적변수들에따른영향을제시하고제조된나노입자의물리적평가및광촉매성능을평가하였다. P3-G4-11 Titanium Oxysulfide Thin Films Fabricated by Atomic Layer Deposition for Visible-light Driven Water Splitting 가시광선에의한물분해를위한 ALD를통해합성된 TiOS 박막남호철 *, 신현정, 배창득, 양현우. 성균관대학교 We describe the atomic layer deposition (ALD) of titanium oxysulfide films. A new ALD chemistry of tetrakis(dimethylamido)titanium(iv) and hydrogen sulphide (H 2 S) is proposed for fabricating amorphous titanium sulfide layers. We found that the resulting films subsequently underwent oxidation upon reactions under ambient condition, resulting in titanium oxysulfide (TiO 2-x S x ). The resultant structures were analyzed by using X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy, indicative of the formation of TiO 2-x S x. A combined study of Hall-effect measurements and Mott-Schottky analysis showed n-type semiconductor behaviours possessing a good conductivity. Optical properties testify that the present system has a moderate band gap in between the related binary end compounds such as TiS 2 and TiO 2. Moreover, we studied our titanium oxysulfide films for photoelectrochemical water splitting. By comparing the results under ultraviolet and simulated solar light irradiations, the present TiO 2-x S x system exhibited to be active with visible light for water splitting. P3-G4-12 Edge-site Effect on Photocatalytic Performance of MoS 2 Thin Films Fabricated by Atomic Layer Deposition 원자층증착법에의해합성된 MoS 2 광촉매성능에끼치는 Edge site 영향신현정 *. 성균관대학교 208 한국세라믹학회

229 포스터발표 III We first describe that when atomic layer deposition (ALD) is applied to layered materials such as MoS 2, MoS 2 exhibits the non-ideal mode of ALD growth on planar surfaces. This non-ideality does not allow for the conventional linear relationship between the growth thickness and the number of cycles, but it controls the relative ratios of the edgesites and basal planes of MoS 2 to the exposed surfaces. The number of edge sites produced was carefully characterized in terms of the geometric surface area and effective work function and was correlated to the HER performance. With the simple, planar MoS 2 films, we monitored the resulting catalytic performance, finding current densities up to 20 ma cm -2 at -0.3 V versus the reversible hydrogen electrode (RHE), a Tafel slope of 50 to 60 mv/decade, and an onset potential of 143 mv versus RHE. P3-G4-13 Synthesis and Characterization of Silica Aerogel Powders using Alcohol in Sol-Gel Process 졸-겔공정시알코올을이용한실리카에어로겔분말합성및특성이상은 1*, 안영수 2, 이진석 2, 홍창국 3, 조철희 1, 허소연 2, 고혜인 3. 1 충남대학교, 2 한국에너지기술연구원, 3 전남대학교물유리를이용한실리카에어로겔분말합성과정중의졸-겔공정시겔화반응을위하여일반적으로염기성촉매를사용한다. 본연구에서는졸-겔공정과정에서희석된물유리에무기산을첨가하여실리카졸을제조한후, 겔화반응을위하여염기성촉매를이용하지않고알코올을첨가하여신속하게습윤겔을얻었다. 이후용매치환및표면개질동시공정을수행한다음상압건조하여신속하게실리카에어로겔분말을합성하였다. 합성시무기산및치환용매의첨가량등에따라실리카에어로겔분말의특성에미치는영향을알아보았고, 또한분말의합성용량을증대시킴에따른분말의물성변화등도조사하였다. 이를위하여제조된실리카에어로겔분말에대해비표면적, 기공크기및기공부피, 밀도, 미세구조등을분석하였다. P3-G4-14 Fabrication and Characteristics of Silica Aerogel Blanket by Ambient Pressure Drying 상압건조에방법에의한실리카에어로겔블랑켓제조및특성허소연 1*, 안영수 1, 이진석 1, 홍창국 2, 이상은 3, 고혜인 2. 1 한국에너지기술연구원, 2 전남대학교, 3 충남대학교에어로겔은초다공성비정질물질로서기계적강도가취약하고소수성이있어성형이쉽지않고, 취급이용이하지않기때문에암면, 유리면및폴리에스터등에복합화시켜에어로겔블랑켓을제조함으로써응용상의제한및시공상에로점등을해결할수있다. 본연구에서는에어로겔분말제조과정중에생성된소수화겔이들어가있는혼합용액을분리한후, 이용액의침적을위해용매와혼합시켜제조된혼합용매를직조섬유상에침적복합화시킨후, 고비용초임계건조공정이아닌상압건조공정을거쳐에어로겔블랑켓을저비용으로제조하였다. 구체적으로는출발원료로물유리를사용하고암모니아수가아닌알코올을이용하여겔화시켜얻은습윤겔에치환용매및표면개질재를첨가하여소수화겔을형성한다음, 헥산등의용매를혼합하여블랑켓을침적시킨후, 이를상압에서건조하여실리카에어로겔블랑켓을제조하였다. 이와같이제조된에어로겔블랑켓내의에어로겔분말의비표면적, 기공크기및용적등의물리적특성과블랑켓의미세구조및열적특성등을분석하였다. P3-G4-15 Quantum Dot-converted White Light-Emitting Diode 파장변환방식양자점백색발광다이오드박슬기 1,2*, 장호성 1, 이광렬 2. 1 한국과학기술연구원, 2 고려대학교삼사원계황동광인하향변환양자점은수나노미터 (nm) 의크기로전기적, 광학적특성이크기와조성에의해크게변화될수있다. 자외선이나가시광선을흡수한후가시광선에서근적외선에이르는다양한파장의빛을발광한다. 이러한특성을이용해청색 Light-Emitting Diode (LED) chip 위에양자점을도포하면백색을발광하는백색 LED를구현하는것이가능하다. 그중 CuInS 2 (CIS) 양자점은발광밴드의폭이넓은황색발광을나타내므로, 백색 LED를제조하는데적합한재료라할수있다. 그러나황색발광 CIS 만으로는가시광선스펙트럼에해당하는전파장영역에대해발광을나타내지않기때문에, 우수한연색특성을가지는백색 LED를구현하기어렵다. 이러한문제를해결하기위해황색발광 CIS와적색발광 CIS를합성한후백색 LED를제조하였다. 합성된양자점의크기와형상및결정구조, 광특성을조사하기위해 TEM, XRD, PL 분석을수행하였으며, 황색및적색발광 CIS를도포하여제작된백색 LED의광특성을조사하였다. P3-G7-1 Development of High Performance Precast Block for Steel-Making 열간특성이우수한제강용 Precast Block 개발박준영 *, 곽민재, 하창기, 고진석, 이석근. 한국내화 ( 주 ) 부정형내화물에사용되는 Calcium-Aluminate Cement (CAC) 는 Castable에적합한레올로지및기계적강도를부여함으로써내화물에가장많이사용되는결합제이다. 그러나, CAC내 CaO 성분이열간에서저융점물질생성을유도하여내화물의열간특성및내식성을저하시킨다. 따라서, 제품의특성향상을위해 CAC 함량을저감시킬필요가있다. 또한시공체의균일한품질유지및침식이극심한유탕부 (Impact Zone) 보강을위해 Precast Block화할필요가있으며, Precast Block 적용시유탕부를분리시공함으로기계적 열적충격에의한 Crack 확장을완화시킬수있다. 본연구에서는 Al 2 O 3 -MgO질용강래들유입재의 CaO 함량을 1.0% 이하로제한한 Ultra Low Cement Castable (ULCC) Precast Block을개발하여열간에서의저융점물질생성최소화를통해제품의특성을향상시켰다. Lab. Test 에서강도, 내침식성평가를진행한결과, Low Cement Castable (LCC) 대비약 10% 의열간특성및내침식성향상을나타냈으며, Field Test에서도기존 LCC 대비초기 Crack의확장정도가완화되었고, 약 10% 의수명향상을나타냈다. P3-G7-2 Analysis of Setting Retarder Mechanism of Low Cement Castables Low Cement Castable의경화지연기구해석설용남 *, 이슬비, 고진석, 이석근. 한국내화 ( 주 ) 일반적인 Castable은시멘트를결합제로사용하고, 수화반응에의해경화되면서유동성이소실된다. Castable의유동성은작업능률과시공체상태에영향을주기때문에경화지연제를첨가하여경화시간을조절하고있다. Low Cement Castable은 Boron계경화지연제가널리사용된다. 경화지연제는시멘트 Ca 2+ 이온과경화지연제이온이반응하여난용성의염을만들고, 시멘트표면에보호막을형성하여수화반응을지연한다고알려져있다. Boron계경화지연제는특성에따라여러종류가있으며, Castable 사용용도에맞게선택하여사용한다. 한국세라믹학회 209

230 2017 년한국세라믹학회추계연구발표회 본연구는 Low Cement Castable 에사용되는 Boron 계경화지연제종류에따른유동성과경화시간차이를밝히는데목적이있다. 물에시멘트를분산시킨용액을교반후여과하여각종이온을포함한추출액을만들고, 서로다른 Boron 계경화지연제를첨가하여 ICP 이온분석과 ph 를측정했다. 그결과, 경화지연제에따라 ph 차이가발생했고, Al 을함유한겔침전물이생성됐다. 또한, Low Cement Castable 은경화지연제종류에따라 ph 와이온용출량이달라서 Castable 의유동성과경화속도차이가나타났다. P3-G7-3 Corrosion Behavior of Zirconia Refractories by Mold Flux Containing Calcium Fluoride Calcium Fluoride가포함된 Mold Flux에의한지르코니아내화물의침식거동소성민 1*, 김경훈 1, 박주석 1, 김형순 2. 1 한국세라믹기술원, 2 인하대학교 Zirconia (zirconium dioxide, ZrO 2 ) is particularly used in carbon containing refractories of steelmaking such as sliding plates, submerged entry nozzles (SEN) because of good fracture toughness, low thermal conductivity, high corrosion resistance against various types of molten slags. In refractory applications the zirconia is CaO or MgO stabilized zirconia, therefore many studies have be reported the corrosion mechanism of CaO or MgO stabilized zirconia refractories by molten slags. Whereas Y 2 O 3 stabilized zirconia is not used as refractories, accordingly the interaction of stabilized zirconia with metallurgical slags is few investigated. However, more research in corrosion behavior of Y 2 O 3 stabilized zirconia is necessary to improve zirconia based refractories. In this study, we investigate the corrosion of MgO, CaO and Y 2 O 3 stabilized zirconia by mold flux for submerged entry nozzles at 1,550 C under static condition. After experiment, mold flux-zirconia interfaces were analyzed by FE-SEM/ EDS, XRD to compare corrosion behavior depending on the type and content of stabilizing agents. It was determined that interaction of zirconia and mold flux precipitate a phase transformation of zirconia from tetragonal or cubic into monoclinic. P3-G7-4 Improvement of Mechanical Properties of Silica-Based Ceramic Core with Addition of SiC SiC 첨가를통한실리카계세라믹코어의기계적특성향상김봉구 *, 박혜영, 최현희, 조근호, 김은희, 정연길. 창원대학교중공형주조품제작에있어주조품내부에공간을형성하는데중요한구성품인세라믹코어는주조시고온의용탕과직접적으로접촉하고, 용탕의자중을고려하여고온강도의발현은필수적이며, 고온강도의증진을위해서는출발물질에서조성의개선이필요하다. 본연구에서는기존에널리사용되고있는실리카계세라믹코어의기계적특성을개선하기위해실리카결정화 (Cristobalite) 의촉매역할을하는탄화규소 (SiC) 의첨가및유-무기전환공정을적용하여특성을고찰하였다. 출발물질로는현재세라믹코어화합물로가장많이사용되는지르콘 (ZrSiO 4 ) 과용융실리카 (SiO 2 ) 를사용하였다. 출발물질과무기바인더전구체 ( 실리카의전구체인 Tetraethyl Orthsilicate와산화나트륨의전구체인 Sodium Methoxide) 를혼합후건조하였으며, 준비된분말에 SiC를각각 5%, 10%, 15% 의무게비로첨가하여유기바인더 (PVA, Poly vinyl alcohol) 와혼합하여압축공정으로시험편을제작하였다. 제작된시험편은 80 o C, 1 h 건조후 1000 o C, 1 h에서열처리하여유리질형성을유도하였다. 시험편의소성강도를측정한결과, SiC를 15% 첨가한시험편의소성강도는 31.7 MPa로 SiC를첨가하지않은시 험편의소성강도인 25.3 MPa 에비해약 6 MPa 이상높은강도특성이발현되었으며, 이는 SiC 를첨가함에따른충진밀도의증가와소결성의향상에기인하는결과로사료된다. 본연구를통해실리카계세라믹코어제작에있어 SiC 를첨가함에따라세라믹코어의기계적특성을향상시킬수있음을확인할수있었다. P3-G7-5 Improvement in Hygroscopicity of Inorganic Binder and Strength Reduction through Dual Coating Process 이중코팅적용을통한무기바인더의흡습성및강도저하개선최현희 *, 박혜영, 이혜주, 김봉구, 조근호, 김은희, 정연길. 창원대학교기존의사형주조에적용되는주형은출발물질과유기바인더를혼합후성형하여제조되는데, 제조공정이간단하고낮은생산비용으로인해주조산업에서널리사용되어왔다. 하지만주조중고온에서유기바인더의분해로인해주형에결함이생성되고붕괴되거나수축팽창으로인해복잡하고정밀한치수의주조물을형성하기에어려움이있다. 이를해결하기위하여유기 무기바인더전환공정이제시되었으나, 열처리전상온에서장시간보관시에는수용성인무기바인더의흡습성으로인해주형의강도저하및파손이발생하게된다. 따라서, 본연구에서는무기바인더의흡습성을개선시키기위해비수용성유기바인더를재코팅하는이중코팅공정을도입하여기존의공정과비교하였다. 제작된시험편은기존의무기바인더전구체 (TEOS: SiO 2 전구체와 NaOMe: Na 2 O 전구체 ) 용액에침지하고건조과정후, 시험편제작을위하여사용되던 PVA 또는레진계바인더를대신하여기계적및열적성질이우수한비수용성유기바인더 PP (Poly Propylene) 용액에침지및건조하였고, 1000 o C에서열처리를하여유기 무기전환공정으로유리질을형성하였다. 접촉각측정결과, 기존공정의시험편에서는흡습성이매우커서접촉각의측정이불가능했지만비수용성유기바인더로재코팅한시험편에서는접촉각이증가하였고, 증가된접촉각으로인해무기바인더의흡습성이개선됨을예측할수있었다. 또한, 무기바인더에침지후상온에서유지시간에따른강도특성및미세구조비교에서도비수용성유기바인더코팅층의영향으로성형및소성강도가유지됨을확인할수있었다. P3-G7-6 Characteristics of Multi-Layered Porous Plug for Steel-Making 제강용다단형 Porous Plug 특성평가장문진 *, 김환식, 최현철, 이석근. 한국내화청정강생산및야금효과증대를위해사용되는Porous Plug는래들바닥에설치하고불활성 Gas(N2, Ar) 를취입하는기능성내화물로용강온도및성분의균일화, 비금속개재물 (Non-metallic inclusion) 의부상분리촉진, 용강의물리 / 화학적반응가속화를통해강의순도를향상시킨다. 다단형포러스플러그 (Multi-layered porous plug) 는기존의일반형포러스플러그를 2개이상으로분할하여적층한포러스플러그로상하부물성편차및제품설계길이제약을해소하여품질안정성및수명증대를위해적용하였다. 본연구에서는다단적용이포러스플러그의물리 / 화학적특성에미치는영향에대해고찰했다. 포러스플러그상 / 하부의물성편차에대해비교분석했고, 고온반응성을확인하기위해침윤시험을실시했다. 통기율측정및실로적용을통해조업안정성을확인하였다. 물성시험결과다단형포러스플러그가일반포러스플러그에비해상 / 하부편차가 26% 이상줄어듬을확인했다. 이는포러스플러그길이가작아짐에따라균일한성형압이적용 210 한국세라믹학회

231 포스터발표 III 되기때문으로보인다. 또한실로적용결과기존제품에비해용손율이 27% 향상됨을확인했다. P3-G7-7 Fabrication of Silica based-ceramic Core with Different Particle Morphology 입자형상에따른실리카기반세라믹코어제조에관한연구박정수 1*, 여정구 2, 조철희 1. 1 충남대학교, 2 한국에너지기술연구원본연구에서는비정형및구형실리카를출발물질로사용하여세라믹코어에서세라믹입자형태의영향에관한연구를하였다. 세라믹입자는세라믹코어의물성에영향을미치는요소인사출성형공정, 기계적특성및미세구조에영향을준다. 비정형및구형실리카로제조한세라믹코어의물성을평가하기위해피드스탁의점도, 굽힘강도, 수축률, 기공율, XRD 및 SEM을측정하였다. 구형실리카를사용하여피드스탁의점도를낮추고, 세라믹코어의강도를향상시켰으며, 수축률을줄일수있었다. 또한, 세라믹코어의성능을향상하는데중요한역할을하는크리스토발라이트가구형실리카를사용한세라믹코어에서더많이형성되는것을관찰하였다. P3-G7-8 Study on the Photocuring Shaping and Heat Treatment of Porous Silica Body 실리카다공체의광경화성형및열처리에관한연구박정수 1*, 여정구 2, 양승철 2, 조철희 1. 1 충남대학교, 2 한국에너지기술연구원본연구에서는용융실리카와아크릴수지를사용하여다공성실리카시편을제작하였다. 실리카분말을아크릴수지에첨가하여혼합을하였을경우 75 wt% 까지의고형분량을확인하였다. 고형분량을높이기위하여나노크기의미세한분말이분산된아크릴수지를분산제의역할로첨가하였고, 82 wt% 까지고형분을증가시킬수있었다. 이렇게제조한슬러리를 UV 광원을조사하여성형체를얻었다. 제작한성형체는 1200~1450 o C 온도범위에서열처리를해소결체를만들었다. 최종시편의꺽임강도, 수축률, XRD 및 SEM을분석을진행하였고, 경화및소결후외형의변화를외관상관찰하였다. 결과적으로경화및소결후외형상뒤틀림등의결함이없으며강도를가지는실리카다공체를제작하였다. P3-G7-9 Effect of Impregnation Solvent on the Physical and Mechanical Properties of Silica-Zircon Porous Composites 실리카 -지르콘계다공체에서함침액이물리기계적물성에미치는영향박정수 1*, 이진석 2, 여정구 2, 조철희 1. 1 충남대학교, 2 한국에너지기술연구원본연구에서는석유계왁스결합제를사용하여다공성실리카-지르콘시편을제작하였다. 제작한시편은최고 1450 o C의온도에서소결을행하였다. 소결체를각각페놀수지, 폴리비닐알코올및우레아의농도를달리하여준비한용액에넣고함침을시켰다. 함침한시편은함침액의물성에따라조건에달리하여건조하였다. 함침시편의강도를비교하기위하여상온에서 3점꺽임강도를측정하였고, 페놀수지용액을사용하여함침한시편의강도가가장우수한것으로나타났다. 더자세한분석을위하여미세구조, 상분석및기공률을측정하였다. 측정결과함침후실리카- 지르콘이외의상은발견되지않았고, 50 wt% 의함침용액에서물성이달라지는것을관찰하였다. P3-G7-10 Investigation of Hydration Process and Biocompatibility of Portland Cement based on Calcium Silicate 칼슘실리케이트기반의포틀랜드시멘트의수화과정및생체적합성에대한연구임지원 *, 국재근, 임하니, 송선주. 전남대학교 MTA (Mineral Trioxide Aggregate) 는치아및잇몸에적용시우수한생체적합도를보이고, 방수, 밀폐효과가뛰어나세균의증식을억제하고, pulp capping( 치수복조법 ), pulpotomy( 치수절단술 ), resorption repair 등다양한분야에서사용이가능하다는장점이있다. 기존 MTA 제품은제조방법의불명확성으로인한높은단가, 취급의어려움, 긴경화시간 (~2시간 45분 ), 연구부족에따른카피제품의개발저하라는문제점을가지고있었다. 그렇기때문에신조성과미세구조를제어할수있는 MTA를개발할필요가있다. 포틀랜드시멘트를기반으로한규산칼슘 (Calcium silicate) 은기존 MTA 제품과비슷한조성, 항균반응, 생물학적특성을지니고있고, 상대적으로가격이저렴하다는특징을가지고있다. 그러나중금속을함유하고있어독성이라는문제점을가지고있다. 그렇기때문에독성을제거한새로운포틀랜드시멘트제조는기존의 MTA를대체할수있는좋은후보군중하나이다. 샘플의제작은 MTA 구성성분중에서잘알려진규산칼슘계시멘트를독립적으로합성하였다. C2S, C3S는고상법을이용하여제작하였고, C3A 는 Pechini법으로합성하여제작하였다. 단일상여부, 입자사이즈, 구성성분등의정량적인분석을위해서 XRD, SEM 및 EDX 분석을하였고, 각각의수화과정을분석하기위해 EIS를이용하였다. 수화과정중에발생하는열은 DSC 분석을이용하였고, 수화가일어난후의시멘트또한 XRD, SEM 및 EDX분석을통해경화시간및수화율을비교분석하였다. 또한생물학적적합성에대해평가하여상용화가될수있는후보군중하나임을확인할수있다. P3-G8-1 Evaluation Method for Grain Size and Pore Ratio of Ceramic Heat Dissipation Materials 세라믹방열소재의 Grain size 및 Pore ratio 평가법전기욱 *, 주민호, 신희연, 김영성. LG전자최근전기소자가고성능 / 집적화됨에따라발열에의한주변소자의오작동, 기판열화등이발생하고있다. 이는소자성능저하를야기시키기때문에, 발열을제어하는기술에대해많은관심과연구가이루어지고있다. 전기자동차파워모듈, 열확산기판등에주로사용되는방열세라믹소재는소재종류, 불순물 / 기공등의결함그리고결정립크기및분포에의해특성이좌우된다. 보편적으로사용되는 SEM 분석으로는결함이나결정립형상에대한정성적평가가가능하지만, 통계적인정량수치는얻을수없다. 본연구는 SEM 이미지프로세싱프로그램 ( 직경측정법 ) 을개발하여, 이미지내에서관찰되는전체결정립크기및기공분율을통계적으로평가하는분석기술에관한것이다. SEM 영상을격자화한뒤에각결정립 / 기공에해당하는교차된격자선의개수를계산하여기공의분율을도출하였고, 연속되는결정립 / 기공의격자길이계산을통해결정립크기를정량화하였다. 이를활용하여방열소재 3종 (Al 2 O 3, AlN, Si 3 N 4 ) 에대한소재별평균결정립크기 / 기공분율을정량적으로계산하여, 각각 Al 2 O um/15.42%, AlN 4.48 um/11.61%, Si 3 N um/20.74% 로결과를얻을수있었다. 한국세라믹학회 211

232 2017 년한국세라믹학회추계연구발표회 P3-G8-2 Temperature Dependent Elastic and Thermal Expansion properties of W3Co3C, W6Co6C and W4Co2C Ternary Carbides 온도에따른 W3Co3C, W6Co6C, and W4Co2C 삼원계탄화물의탄성특성및열팽창특성변화연구김지웅 *, 김명재. 한국지질자원연구원 W3Co3C, W6Co6C, and W4Co2C are known as h-phases of WCeCo materials that format the expense of the Co phase, because Co allows C diffusion. Their intrinsic properties are generally poorly understood. We report here first-principles calculations of the temperaturedependent elastic and thermal expansion properties of these three phases. We calculated the elastic constants by using the strainestress relations. The effects of temperature on the elastic propertieswere examined in the framework of Debyee Grüneisen theorywith the quasistatic approximation. Using the results of the elastic properties,we examined the rigidness, brittleness, and ductility of the ternary carbides. In addition, we confirmed the reliability of our Debye calculations by comparing the results of previous experiments and phonon density of states with quasi-harmonic approximation. The results expand our understanding of the ternary carbides in the WCeCo system. P3-G8-3 Quantitative Expression of the Pore Fragmentation and Change of the Sintering Pressure 기공분해정도의정량적표현과소결구동력의변화오경식 *, 백용균. 안동대학교소결중치밀화속도는기공의소멸속도로결정된다. 기공의소멸속도는소재의표면에너지와계면에너지등의물리량은물론기공의부피및구조에따라결정된다. 기공의소멸속도에는기공의갯수도중요한변수이다. 같은기공률인조건이라도미세한기공이다수있는경우와조대한기공이소수있는경우의기공소멸속도는동등하지않다. 이와같은차이를치밀화속도에도입하기위해기공률변화에따른기공의수변화로부터기공의개수가갖는효과의정량화를시도하였다. 이는기공의부피당개수 (n) 와기공의부피비 (f) 가비례하는경우, 무관한경우, 그리고반비례하는경우로구분되며이를간단히지수 (m) 으로나타내었다. m의값에따른기공의분해정도의정량적의미를알아보았으며이때기공의수축율및치밀화속도를계산하였다. P3-G8-4 Preparation and Luminescent Properties of Long Afterglow Phosphor 장잔광형광체의합성및광특성박인용 *. 한밭대학교장잔광형광체는자발광과축광성의두종류가있으며, 야광도료나방재표시용등으로이용되고있다. 자발광형광체는형광체에방사선물질을첨가하여여기원 (exciting source) 으로사용하므로발광이오래지속되지만, 방사선물질을사용함으로써취급에주의를요한다. 한편, 축광성형광체는여기원인광에너지를흡수 축적하여그에너지원을차단한후에도장시간동안발광하는형광체로흡수-발광과정을반복하는성질을갖고있다. 본연구에서는적색축광성형광체로알려진 Zn 3 Ga 2 Ge 2 O 10 :Eu 3+,Pr 3+ 형광체의 Zn 자리에 Ca 이온을일부치환하여 Ca의첨가량에따른효과를조사하였다. 이들형광체는고상반응법으로합성하였다. 원료분말을 24시간동안볼밀링을하고대기분위기중에서 900 o C에서 2 시간하소한후 disc형태로성형을하여 1200 o C에서 2시간동안 대기분위기에서소결하여시편을제조하였다. 이들형광체의특성분석으로는결정구조와발광특성및잔광에대하여조사하였다. P3-G8-5 The Effect of Activator Contents on Luminescent Properties of Chlorospodiosite Phosphor Chlorospodiosite계형광체의활성제첨가량변화에따른발광특성박인용 *. 한밭대학교 Apatite 결정구조를갖는 calcium holophosphate계는대표적인청색형광체로서널리사용되고있다. 본연구에서는 apatite와는다른결정구조를갖지만, 장파장자외선의여기원 (exciting source) 에서높은발광효율을갖는 chlorospodiosite (Ca 2 PO 4 Cl) 계청색형광체의합성을위해활성제로써 Eu 2+ 이온을사용하여첨가량에따른발광특성을조사하였다. 이들형광체는칼슘, 유로피움, 인의염수용액을사용하여공침법 (coprecipitation) 으로전구체침전물을얻고 hotplate로가열하여액체를증발시킨후, 500 o C에서 1시간가열하였다. 얻어진분말을환원열처리를하여청색형광체분말을합성하였다. 이들형광체분말의결정구조와광학적특성을 XRD, spectrometer 로분석하였다. (Ca+Eu)/P 원자비는 2:1로고정하고 Eu 2+ 이온비를변화시켜활성제농도의영향을조사하였다. 또한열처리온도에따른특성도조사하였다. P3-G8-6 Plasma Corrosion Resistance Evaluation by Materials 소재별플라즈마내식성평가김동표 1*, 김승래 1, 윤상옥 1, 김세훈 1, 김상호 2, 조형환 1. 1 강릉원주대학교, 2 강원테크노파크반도체및디스플레이제조공정중플라즈마를사용하는공정에서필수적으로사용되는세라믹소재는플라즈마에의해식각되어 Particle 발생으로오염원으로작용하고있다. 본연구에서는내플라즈마소재로일반적으로사용되고있는소재의플라즈마에따른내식성평가및내구성을향상시키기위한소재개발을진행하였다. 내플라즈마소재로사용되고있는 Al 2 O 3, Bulk Y 2 O 3, Y 2 O 3 용사코팅소재를플라즈마조사시간에따른변화를밀도, 무게감량, 표면거칠기, 미세구조등을관찰하였으며, 내구성을향상시키기위해밀도를향상시켜플라즈마에내식성을평가하였다. P3-G9-1 Synthesis and Characterization of Oxide Composite for Stereolithography SLA 3D 프린팅용무기산화물복합소재합성및특성평가이진욱 1*, 남산 1, 황광택 2, 김응수 2, 김진호 2, 한규성 2. 1 고려대학교, 2 한국세라믹기술원 3D 프린팅이란 3차원으로디자인된디지털정보에따라얇은 layer 를적층하여복잡한형태의 3차원제품을생산하는기술이다. 3D 프린팅기술은적층방식에따라다양한방식으로연구되어왔으며, Stereolithograpy Apparatus(SLA) 는레이저를이용하여광경화성소재를적층하는방식의 3D프린팅기술이다. 기존 3D 프린팅용소재는대부분플라스틱과금속을활용하고있으나, 최근에는다양한소재를 3D프린팅에적용하려는연구가활발히진행되고있다. 세라믹소재의경우고온소성공정을요구하는고유의특성으로인해아직까지연구초기단계에머물러있으나, 세라믹산업이나날이커져가는 3D 프린팅시장에진입하기위한경쟁력을갖추기위해서는 3D 프린팅용세라믹소재개발이매우시급한실정이다. 본연구에서는 SLA 방식의 3D 프린팅에적용될수있는무기산화물기반의복합소재를합성하고적층성형특성에대해분석하였다. 무기산화물과광경화성소재를복합화하여 SLA로 212 한국세라믹학회

233 포스터발표 III 적층된성형체의물성분석을통해세라믹소재를활용한, 3D 프린팅적용가능성에대해연구하였다. P3-G9-2 Ink-jet Printing of Thermally Stable Ceramic Ink for Digital Decoration 잉크젯프린팅용고화도세라믹잉크의합성과프린팅특성연구이지현 1*, 한규성 2, 황해진 1, 황광택 2, 조우석 2, 김진호 2, 권종우 2. 1 인하대학교, 2 한국세라믹기술원세라믹잉크젯프린팅기술은디자인이미지를디지털화하여이미지또는패턴을출력하기때문에기존스크린프린팅공정에비해소비자가원하는이미지또는패턴의변화에대해즉각적인대응이가능하다. 또한원하는위치에만선택적으로잉크를토출시키기때문에잉크의효율이매우높고폐기물의발생이거의없어친환경적인공정구축이가능하다는장점이있다. 이러한장점으로인하여세라믹잉크젯프린팅기술은최근산업적으로크게주목받기시작하였다. 잉크젯프린팅용고화도세라믹잉크의요구조건으로는원활한잉크토출을위한적절한점도, 표면장력, 300 nm 이하의안료입도, 분산안정성그리고 1000 o C 이상에서의발색안정성등이있다. 본연구에서는잉크젯프린팅에사용되는고화도세라믹잉크를제조하고다양한기판에서의프린팅특성을확인하였다. 세라믹잉크에사용된고화도세라믹안료는고상법에의해합성되었고, 결정구조, 미세구조및발색특성을분석하였다. 미립화공정을거친후세라믹안료는점도, 표면장력및분산안정성이잉크젯프린팅적용에최적화된세라믹잉크로합성되었다. 합성된세라믹잉크를잉크젯프린팅공정으로세라믹타일및유리기판에적용하였으며, 고온소성공정에따른프린팅특성에대해연구하였다. P3-G9-3 Fabrication and Characterization of MAl 2 O 4 (M=Co, Ni, Zn) Pigment Powders by a Reverse Micelle Processing 역마이셸공정을이용한 MAl 2 O 4 (M=Zn, Co, Ni) 안료분말합성및특성분석배동식 *, 손정훈. 창원대학교 Spinel structure (AB 2 O 4 ; A=Co, Ni, Zn and B=Al) pigment nanoparticle was synthesized by a reverse micelle processing for inorganic pigment. Co(NO 3 ) 2, Ni(NO 3 ) 2 6H 2 O, Zn(NO 3 ) 2 6H 2 O, and Al(NO 3 ) 3 9H 2 O are used for precursor in order to synthesis pigment nanoparticles. The aqueous solution is consist of mixing molar ratio of (Co, Ni, Zn)/Al was 1 : 2 and heat treated at 800~1200 C for 2 h. The average size and distribution of synthesized pigment powders was in the range of nm and narrow, respectively. The average size of the synthesized pigment powders increased with increasing water to surfactant molar ratio and heating temperature. The phase peak of synthesized pigment powder increased with increasing heating temperature. The synthesized pigment powders were characterized by x-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM) and color spectrophotometer. The properties of synthesized powders were investigated as a function of such as molar ratio, heating temperature etc. P3-G9-4 Phase Evolution of Porcelain Raw Materials during Firing Process 소성과정에서도자기원료물질의상변화고찰김재겸 1*, 김종영 2, 김승주 1. 1 아주대학교, 2 한국세라믹기술원 Typical porcelains are made by firing raw materials consisting of mineral deposits such as clay, feldspar and quartz. The phase proportions and the firing conditions are very important factor to affect the physical properties of porcelains. In this work, porcelain raw materials fired at different temperatures were characterized by X-ray powder diffraction combined with quantitative phase analysis using the Rietveld method. The main components constituting the raw materials are quartz (SiO 2 ), microcline (KAlSi 3 O 8 ), albite (NaAlSi 3 O 8 ), muscovite (KAl 2 (AlSi 3 O 10 )(OH) 2 ), and kaolinite (Al 2 Si 2 O 5 (OH) 4 ). During the firing process, the microcline, albite, muscovite and kaolinite phases reacted with each other to produce the mullite and quartz phases embedded in an amorphous matrix. The amount of quartz remained nearly unchanged until a temperature above 1200 C; then, it converted to an amorphous phase at higher temperatures. P3-G9-5 Sintering Properties of 3Y-ZrO 2 Synthesized by forced Hydrolysis/Precipitation Method(II) 가수분해 / 침전법으로합성한 3Y-ZrO 2 의특성 (II) 김보랑 1*, 오영우 1, 채지훈 2, 강종봉 1. 1 경남대학교, 2 ( 재 ) 경북하이브리드부품연구원지르코니아 (ZrO 2 ) 는높은강도, 인성, 화학저항성, 열적안정성및내마모성등의특성으로인하여구조재료로서널리응용되고있으며, 특히 3Y-TZP(Tetragonal Zirconia Polycrystal) 는세라믹스의결점인취성을개선함으로서더많은용도를창출하고있다. 본연구는 ZOC(ZrOCl 2 8H 2 O), YCl 3 6H 2 O, AlCl 3 6H 2 O, FeCl 3 6H 2 O, MnCl 2 4H 2 O, NH 4 OH 및증류수를이용하여반응온도와반응시간을조절하면서열가수분해및공침과단일침전법으로수 nm 크기의 3Y-hydrous ZrO 2 1차입자와응집된 2차입자, 그리고소결조제인 Al 2 O 3, Fe 2 O 3, MnO 2 등을합성하고, 이를수세, 하소, 소결을행하여분말의크기. 형상, 상변화등으로시료의특성을분석하였다. 열가수분해의반응온도와반응시간은합성된입자의크기, 수율, 비표면적등에영향을미쳤으며, 침전제인 NH 4 OH는가수분해한졸입자의침강속도에영향을주었다. 침전후상등액을 XRF 로원소분석한결과미반응의 Zr 4+, Y 3+, Al 3+, Fe 3+ 등의이온이존재하지않아가수분해 / 침전법으로화학양론적인 3Y-hydrous ZrO 2 가그리고공침및단일침전법으로 Al(OH) 3, α-feooh 및 Mn(OH) 2 가합성되었음을확인하였다. 초기열가수분해법으로합성된 Hydrous Zirconia의 XRD 분석결과대부분 monoclinic 상이었으나 600 o C에서하소한시료는 mono-와 tetra- 상이혼재하였으며 1350 o C에서소결한시편은대부분 tetra- 상이었다. 침전시켜얻은소결조제를 total 1 wt% 이하로단일또는혼합첨가하여 1250 o C 에서소결시킨시편은균일한 grain을가지며 Al 2 O 3 1 wt% 첨가의경우밀도는이론밀도의약 98% 로이는 1350 o C에서소결한상용시편의밀도와비슷하며, 경도도사용의고온소결 3Y-TZP 와유사한값을나타내었다. P3-G9-6 Synthesis of Indium Hydroxide Powders by a Precipitation Method and Aging Effect 침전법을이용한 Indium hydroxide 분말의합성및 aging 효과최은경 1*, 심광보 1, 김응수 2, 조우석 2. 1 한양대학교, 2 한국세라믹기술원고밀도 ITO 타겟제조를위해입자의크기가미세하면서도응집성이적은 In 2 O 3 분말을합성해야한다. 본실험에서는 In 2 O 3 분말의특성에영향을미치는전구체 Indium hydroxide 분말의크기와형상을제어하는것에목적을두고있다. 출발물질로써 Indium 한국세라믹학회 213

234 2017 년한국세라믹학회추계연구발표회 metal 을질산 (HNO 3 ) 과증류수의혼합용액에용해시켜 In(NO 3 ) 3 용액을만들었다. 침전제로수산화암모늄 (NH 4 OH) 을사용하여농도, ph, 온도가 Indium hydroxide 특성에미치는영향을분석하였다. 또한침전물의 aging 시간에따른결정성장거동및응집효과를관찰하였다. P3-G9-7 Development of a Stable Al 2 O 3 Slurry coated with Silane Coupling Agent and Monomer 실란커플링제및모노머를이용한안정한 Al 2 O 3 슬러리제조기술류국현 1*, 김응수 2, 이종흔 1, 조우석 2. 1 고려대학교, 2 한국세라믹기술원산업및기술의융합에따라다양한소재의개발이요구되고있으며이에따라세라믹복합체를적용한 3D 프린팅기술개발이활성 화되고있다. 본연구에서는광경화공정등에적용가능한나노사이즈의알루미나를기반으로제조한슬러리의물성분석을실시하였다. 알루미나입자를 silane coupling agent 를이용하여코팅하고 monomer 와반응시켜안정한슬러리를제조하였다. 슬러리의유변학적특성은 Rheometer 장비를사용해 Apparent Viscosity, Oscillation sweep 을분석했다. 분산안정성을확인하기위해 Turbiscan 장비로분산조건의충족여부를확인하였다. 마지막으로알루미나슬러리내첨가제간의응집현상을관찰하기위해침전거동을분석하였다. 위의방식으로분석한결과, 적정점도및분산안정성을가지며응집현상이관찰되지않음으로보았을때분산안정성을가지는알루미나슬러리임을확인할수있었다. 214 한국세라믹학회

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237 엔지니어링세라믹스산학연기술교류회 P-1 직류및교류전기영동법및세라믹 - 세라믹접합법윤당혁. 영남대학교본산학연기술교류에서는저희연구실에서진행해온몇가지최근의연구결과에대하여소개하기로한다. 첫째는탄화규소섬유강화탄화규소복합체제작을위한기지상침착법으로활용한초음파를병행한직류또는교류전기영동법으로써, 탄화규소섬유로구성된프리폼의내부의미세기공까지세라믹분말로구성된기지상을침착함으로써밀도가높은섬유강화복합체를구현하는방법이다. 특히직류전기영동법은전기분해로인하여물을용매로사용하지못하는반면, 교류전기영동법에서는비대칭신호를적용함으로써물의전기분해를최소화함으로써친환경적인물을용매로사용할수있는장점이있다. 이러한전기영동법은위에서언급한복합체의제작외에도모재의형상에구애받지않는코팅층을형성할수있는방법이다. 두째는 Ti 3 AlC 2 또는 Ti 3 AlC 2 MAX 상을이용한 SiC 단미체또는 SiCf/SiC 의접합에관한것으로, 최소한의압력으로 1600 o C 이상의온도에서탄화규소의접합을실시할수있으며, 또한 Ti 3 AlC 2 의경우에는고온에장시간유지함으로써접합재를모재사이로확산시켜접합재가존재하지않는접합을구현하는방법이다. 셋째는 Ag 분말에 CuO 를 10 wt.% 내외첨가시킨페이스트나테이프를이용하여세라믹 - 세라믹또는세라믹 - 금속을접합시키는 reactive air brazing 에관한것이다. 이방법은공기분위기에서접합이가능한방법으로 960 o C 이상의온도에서 Ag 의용융에의한접합을이루는것으로 800 o C 내외의고온공기분위기에서도접합강도를유지하는장점이있다. 본방법은고온공기분위기작동에필요한고체산화물연료전지나산소분리막등의접합에사용할수있다. Keywords: 전기영동법, 섬유강화복합체, MAX 상접합, Reactive air brazing P-2 세라믹기능소재제조및분말공정기술이현권. 국립금오공과대학교 1. 기능소재관련기술 1) 내플라즈마성 YAS(Y 2 O 3 -Al 2 O 3 -SiO 2 ) 프릿제조및코팅기술 - 내플라즈마성 YAS 계프릿조성확립 - YAS 계프릿결정화도제어기술 - 내플라즈마성 YAS 계코팅층상 (Phase) 제어기술 - 코팅층두께제어 (100 um ~ 400 um) 및치밀코팅층형성기술 - Al 2 O 3 대비 2.7 배, Y 2 O 3 대비 70% 의내플라즈마성확보 2) 고열전도반응소결질화규소세라믹스 - Si 분말의평균입경및입도분포폭제어를통한불순물 (Al: ~20 ppm, 산소 : ~1 wt%) 저감기술 - Si 분쇄용매에따른열전도특성연구 - 소결조제함량에따른열전도특성연구 - 열전도도 81 W/mK 및기계적강도 1.02 GPa 의반응소결질화규소세라믹스제조 3) 반응소결알루미나공정을활용한세라믹스접합기술 - 고순도 (> 99.7%) Alumina-Alumina 치밀접합 - 접합용 Al/Al 2 O 3 혼합분말제조및함유페이스트제조기술 2. 제조공정관련기술 1) 고순도분말제조기술 - 이온교환수지를이용한물유리정제기술 - 정제물유리를이용한 4N 급실리카분말제조 4) 분말과립기술 - 슬러리고체함량및점도에따른분말과립형상및구조제어기술 - 소재 ( 알루미나, 나노 (20~30 nm) 실리카 ) 에따른분말과립입도 제어기술 - 나노실리카및알루미나분말과립제조기술 2) 분말분쇄기술 - 분말분쇄를통한평균입경및입도분포폭정밀제어기술 - Si scrap, Al powder, Glass-frit, Alumina etc. 3. 분말혼합기술 - 분말혼합도분석및평가연구 - XRD, PSA를활용한분말혼합지수분석연구 Keywords: 내플라즈마, 고열전도, 접합, 반응소결, 분말제어 P-3 저온에서 PVA 폴리머를이용한나노크기의이트리아분말합성및나노산화물분산강화합금분말의제조기술이상진. Mokpo National University 본연구자는나노크기의이트리아 (Y 2 O 3 ) 분말을 PVA 폴리머용액방법에의하여제조하는기술및이러한기술을응용하여나노이트리아분말이분산된나노크기의구리 (Cu) 분말을제조하는기술을보유하고있음. 수율이높으며소결성이우수한나노이트리아분말과나노산화물분산강화합금분말제조에대한기술임. 저온에서 PVA 를이용한나노크기의이트리아분말의합성기술 - 낮은온도에서합성되며, 고순도, 다공성의물성을갖는 yttria 분말의합성방법에관한것으로, 출발원료인 yttrium nitrate (Y(NO 3 ) 3 9H 2 O) 를증류수에용해시키고, PVA (Polyvinyl alcohol) 용액첨가량을조절하여겔타입 (gel-type) 의나노 yttrium 전구체를형성후, 열처리조건을조절하여평균입경약 20 nm ( 비표면적 : 90~120 m 2 /g) 의크기를갖는나노이트리아 (Y 2 O 3 ) 분말합성에관한것 PVA 용액합성법에의한나노산화물분산강화 Cu 합금분말의제조기술 - Cu-Y 금속염혼합물에 PVA 를금속의양이온들의원자가대비 1:4 내지 8 의비율로첨가하여 Cu-Y 전구체를제조하고환원분위기에서최대 400 o C 이하의온도에서열처리하여이트리아가분산된나노구리 (Cu-Y 2 O 3 ) 분말을제조하는기술로나노산화물분산강화합금분말의제조방법에관한새로운합성방법을제시 Keywords: Nano yttria powder, PVA polymer, Precursor, Cu-Y 2 O 3 alloy P-4 치과치료용 MTA 소재개발기술남궁연, 송선주. Chonnam National University 본연구자는지난 5 년간치과산업에서신경치료를위해사용되어지는 MTA (Mineral Trioxide Aggregate) 관련세라믹시멘트소재기술개발을추진하였으며다음과같은세라믹스관련기술을보유하고있음. o MTA(Mineral Trioxide Aggregate) 제조기술 - 고상법, Pechini 법등을이용한 C3A (tri-calcium aluminate), C2S (di-calcium silicate), C3S (tri-calcium silicate) 등의합성물제조 - EPC (experimental Portland cement) 제조 o EIS(Electrochemical impedance spectroscopy) 분석기술 Keywords: MTA, EPC, Hydration process, Impedance, 치과치료 P-5 SiC 다공체세라믹제조기술이계욱, 김득중. Sungkyunkwan University 다공성세라믹스는기공이갖는특수성을통해분리, 분산, 흡수및유체접촉기능등다양한기능적특성을보이며, 이를이용하여단열재, 흡음재, 경량벽재등의건축자재와탈취재, 배기가스정화 한국세라믹학회 217

238 2017 년한국세라믹학회추계연구발표회 용필터의환경분야에사용되어왔다. 더나아가최근에는물리적, 화학적성질을정밀제어하여반도체, 의약, bio, 환경, 신소재등의첨단분야에이용되고있는추세이며, 앞으로활용방안이넓어질전망이다. 본연구에서는친환경소재분야와에너지산업분야에서고온용소재로사용되는 SiC 다공체세라믹제작에사용되는여러기술들을소개하고자한다. Keywords: SiC, Porosity, Porous ceramics, Grain growth, Powder P-6 상온분사세라믹코팅기술박재혁, 김대근, 이명노, 임종우, 오승철. 아이원스 본아이원스주식회사기술연구소는지난 5 년간반도체및디스플레이, 기계구조산업체에서요구되는다양한기능성세라믹코팅기술개발을추진하였으며다음과같은상온분사세라믹코팅관련기술을보유하고있음. o 내전압용절연세라믹코팅관련기술 - 에어로졸상온분사방법에의한내전압세라믹코팅기술 - Oxide 계를이용한 180 V/um 의내전압특성코팅구현가능 - 대면적 3 차원복잡형상코팅가능 - 코팅적용분야 : metal PCB, Heater, LED 절연층세라믹코팅 o 고경도저마찰코팅관련기술 - 에어로졸상온분사방법에의한고경도코팅제조기술 - Al 2 O 3, TiN, AlN, WC 등의다양한무기소재를이용한고경도저마찰고팅구현 - 대면적 3 차원복잡형상코팅가능 - 코팅적용분야 : 강판및 Polymer 필름제조용롤러표면코팅 Keywords: 상온세라믹코팅, 대면적 3D 코팅, 고경도, 내전압, 내마모 P-7 항공기저장조내경부 Al 2 O 3 피막표면의정밀연마를위한슈퍼피니싱장치의개발최수현 1, 이건희 1, 신오철 2, 조영태 1, 정윤교 1. 1 Changwon National University, 2 Micron Al7075를소재로한항공기저장조는내부피스톤운동을이용하여기내의유압유분배및저장의역할을하는중요한부품이다. 고온, 고압의환경에서작동되는항공조의특성상내경부의내마모성, 내부식성을향상시키기위해 Al 2 O 3 피막을형성하는아노다이징표면처리가필수적이며이때상승한표면거칠기를 Ra 0.2 um 이하로낮추는후속공정이필요하다. 하지만현재후속공정이수작업으로진행되어작업자의안전및생산성문제로인해공정개선이필요하다. 따라서, 본연구에서는항공조내경부 Al 2 O 3 피막의정밀연마를위한자동화슈퍼피니싱장치를개발하고개발장치의연마능률을검증한후항공조내경부전구간균일연마가가능한효율적인연마조건을도출하여후속공정을개선하는데목적이있다. 그결과, 양호한성능의자동화슈퍼피니싱장치를개발하였으며, SiC, Al 2 O 3, Diamond 연마필름을이용한내경부 Al 2 O 3 피막표면슈퍼피니싱실험을진행하였다. 그리고다구찌실험계획법을적용하여최적연마조건을도출하였으며, 향후반응표면법을적용하여구체적인연마조건도출과선정된최적연마조건을바탕으로항공기저장조전면적균일연마를목표로연구를진행할계획이다. Keywords: Airplane Reservoir, Al 2 O 3, Superfinishing, Surface Roughness, Polishing Film P-8 고온구조용엔지니어링세라믹스제조및평가기술박상엽 1, 송준호 2. 1 Gangneungwonju National University, 2 Fine Ceramics Regional Innovation Center 본연구자는지난 20년간고온구조용세라믹관련산업체에서요구되는산화물, 질화물, 탄화물관련엔지니어링세라믹소재의기술개발을추진하였으며다음과같은엔지니어링세라믹스관련기술들을보유하고있음. o 치밀층 / 다공층산화물계적층체제조기술 - 연속테잎캐스팅방법에의한치밀충 / 다공층적층소결체제조기술 - 이종재료 ( 알루미나 / 뮬라이트 ) 의적층에따른계면제어기술 - 치밀층내미세구조 ( 입자및기공 ) 배향기술 - 치밀충 / 다공층적층소결체구조를적용한열충격시균열전파억제기술 o 절삭공구용텅스텐카바이드입자미세화기술 - WC-Co계에서입자성장억제제 (VC) 첨가에따른입자성장억제기술 - WC Scrap의 Up-cycling을통한초미립 WC 분말합성기술 o 반도체공정에사용되는고온용 AlN 히터의소결체제조및평가기술 - AlN 히터의열전도도및강도향상기술 - Tera Hertz파를사용한 AlN 소결체의물성증가요인평가기술 Keywords: 산화물적층체, 텅스텐카바이드, AlN 히터, 테라헤르츠 P-9 고성능나노구조에너지세라믹제조기술황해진. 인하대학교본연구자는지난 20 년간고체산화물연료전지 (SOFC), 전고상리튬이온전지, 고성능 / 다기능단열제, 고강도 / 고내구성 / 생체친화형세라믹블레이드등지속가능한사회의구현에필수적인친환경 / 저탄소소재개발을위한다양한엔지니어링세라믹소재기술개발을추진하였으며아래와같은세라믹스관련소재및공정기술을보유하고있음. o 고체산화물연료전지관련기술 - 연료극열화기구해석및내구성향상기술 - 신개념공기극및연료극형성기술 - 연료극크롬또는탄소침적저감을위한전극구조제어기술 o 전고상리튬이온전지관련기술 - 고안정성 lithium borosilicate 계고체전해질소재기술 - 고이온전도성 Nasicon 계고체전해질합성기술 - 제 1 원리및분자동역학시뮬레이션을활용한고이온전도성전해질소재설계기술 o 고성능 / 다기능단열제기술 - 구형실리카에어로젤고속합성기술 - 실리카에어로젤복합화블랑켓제조기술 - 실리카에어로젤복합화고내열성 / 고강도고분자제조기술 o 탄화규소분말합성기술 - 실리카의 carbothermal reduction 을통한 β-sic 분말합성기술 - β-sic 분말사이즈및입도분포제어기술 Keywords: 고체산화물연료전지, 고체전해질, 지르코니아, 실리카에어로젤, 탄화규소 P-10 플래시소결및초내열, 초고온내산화재료연구와미세구조분석기술황창훈, 오준협, 조대영, 김경윤, 정희준, 윤존도. 경남대학교본연구실은여러산업분야에서필요로하는재료의설계와미세 218 한국세라믹학회

239 엔지니어링세라믹스산학연기술교류회 구조분석에대한연구를진행하여왔다. 우주항공용내열재료로초고온다층코팅막제조와초내열합금의분석기법에대한연구를진행하였다. 또한소결온도가매우높은세라믹재료를빠른시간에치밀하게소결할수있는플래시소결 (Flash sintering) 법에대한연구도진행하고있다. 본연구실은다음과같은제조의설계및분석에대하여관련기술을보유하고있다. 초내열합금의열처리및미세구조분석기술 (2013~ 현재 ) - DSC 열분석을통해등온조건에서의고용한계선온도설계 - 온도조건별열처리를통한온도및시간에따른시효처리효과실험 - 고용한계선온도를기준으로피닝효과 (pinning effect) 에대한용체화처리온도 (sub-solvus) 연구 - 조성이다른초내열합금의미세조직분석을통한비금속개재물및석출상분석 플래시소결법연구기술 (2016~ 현재 ) - 수산화아파타이트의기존소결온도 1200 도보다낮은 900 도에서소결체제조 - 수초내에완전치밀체의수산화아파타이트제조 - 플래시소결법으로제조한시편의미세구조분석을통한소결효과조사 - 플래시소결장비구축예정 ( 공기중 ) - 여러물질에대한플래시소결장비적용연구설계 초고온내산화다층코팅막제조및분석기술 (2009~2013) - 탄소 / 탄소복합체를초고온분위기에서보호하기위한다층코팅막설계 - CVD 법을이용한 SiC 코팅층제조 - 딥코팅 (dip coating), 스프레이코팅, EB-PVD (Electon beam PVD) 법을이용한코팅막설계및제조 - SiOC 층을삽입하여층간미세균열에충진층설계및제조 - 총 4 층다층코팅막제조 (SiC/SiOC/SiC/Y 2 O 3 ) 및 1700~1900 o C 의내산화실험 Keywords: 플래시소결, 초내열합금, 다층코팅막, 내산화, 미세구조분석 P-11 고온구조용세라믹스기반기술박상환. 한국과학기술연구원본연구실에서는에너지, 환경, 반도체, 디스플레이산업에서요구되는고온구조용세라믹스소재관련기반기술개발이추진하였으며그로부터아래와같은엔지니어링세라믹스관련기술에대한연구경험을보유하고있음. o 반응소결탄화규소 - 연속반응소결방법에의한대형 SiSiC 소결체제조기술 - 대형판형 SiSiC 열교환기 in-situ 성형기술및소결기술 o Ternary carbide (MAX) 소재합성 / 소결기술 - 소결체및분말 : Ti 3 AlC 2, Ti 3 SiC 2, Cr 2 AlC,... - Ternary carbide을이용한 2-D Maxene 소재 - 고강도고인성 Ternary carbide nano composite o 방탄판용 B 4 C 소재 - In-situ 화학반응이용 B 4 C 복합재료저온소결기술 o 활성금속브레이징법에의한 Ceramic/metal 접합기술 -Si 3 N 4 /S.S.316, Al 2 O 3 /Cu... - 잔류응력제어를위한 buffer layer 설계기술 o 초고순도 SiC 분말제조기술 - SiC 분말 : 순도 7N, 크기 0.1 um ~ 200 um o 탄화규소다공체 - 대형고온분진 SiSiC 및 SiCf-SiSiC 다공체 filter - Liquid phase sintered SiC 다공체, Meso-Macro 기공 SiC 다공체 Keywords: 탄화규소, 접합, B 4 C, 다공체, Ternary carbide P-12 저온소결형고강도질화알루미늄세라믹소재개발류성수, 이화준, 조우석, 김형준, 김형태. 한국세라믹기술원최근전기자동차, 고속철도, 항공기와같은수송기기의동력이전기모터로점점바뀜에따라전력반도체가실장된전력모듈시장이급속하게증가하고있다. 전력을변환하고제어하는역할을하는전력모듈에인가되는높은전압으로인해발생하는열을효과적으로제거하는것이매우중요하다. 이를위해질화알루미늄 (AlN) 소재와같이높은열전도도를갖는세라믹소재를방열기판으로사용한다. 또한, 차세대수송기기, 전기자동차에사용되는전력모듈의경우높은열적내구성을요구되면서기계적강도값이높은세라믹의개발에대해필요성이대두되고있다. 본연구에서는먼저 AlN 의제조온도를낮추는연구를진행하였다. 이를위해비정질형태의다성분계 MgO CaO Al 2 O 3 SiO 2 (MCAS) 화합물을소결조제로개발하였다. 습식법으로만든나노크기 MCAS 첨가제를첨가한경우, 1600 도에서질화알루미늄을제조할수있었다. 개발된소재는기존의비해 200 도나낮은온도에서제조가가능함으로써기존업체들이별도의설비투자없이생산이가능할뿐만아니라, 제조단가도대폭낮아질것으로예상된다. 또한, 첨가제조성및함량, 소결공정조건등의제어를통해최종 AlN 소재의열전도도는 100 W/mK 이상, 기계적강도 600 MPa 이상의물성을확보할수있었다. 이를통해 LED 조명분야시장에서요구하는방열성능과제품가격이절충된이른바저가형세라믹방열기판소재개발을만족시켜주고, 높은열적내구성을요구하는전기자동차용파워모듈세라믹기판에도적용할수있을것으로기대한다. Keywords: 질화알루미늄, 저온소결, 첨가제, 고강도 P-13 Porous Ceramics from Particle Stabilized Colloidal Suspension Jung Gyu Park, Ik Jin Kim. Institute of Processing and Application of Inorganic Materials, Hanseo University The unique chemical composition and microstructure of porous ceramics enable the ceramic products used in number of applications such as filtration of molten metals and hot corrosive gases, hightemperature thermal insulation, support for catalytic reactions, filtration of diesel engine exhaust gases etc. These applications take advantage of special characteristics of porous ceramics such as low thermal mass, low thermal conductivity, controlled permeability, high surface area, low density, high specific strength. In this chapter, we emphasize on direct foaming method, a simple and versatile approach that allows fabrication of various porous ceramics with tailored microstructure along with distinctive properties. Foam stability is achieved upon controlled addition of amphiphiles to the colloidal suspension which induce in-situ hydrophobization, allowing the wet foam to resist coarsening upon drying and sintering. Keywords: Porous ceramics, Direct foaming, Wet foam stability, Laplace pressure, Adsorption free energy, Microstructure P-14 금속, 세라믹소재소결체의공정기술과개발유진수, 허세윤, 최종현, 신정후, 홍성현. Seoul National University 본연구팀은금속및세라믹산업체에서요구되는고밀도및우수 한국세라믹학회 219

240 2017 년한국세라믹학회추계연구발표회 한특성을가지는소결체의공정기술과개발을추진중이며다음과같은구조엔지니어링관련기술을보유하고있음. o 소결공정관련기술 - 고상, 액상, 통전활성소결등의다양한소결방법을통한 Fe 합금의완전치밀화기술 - 통전활성소결의 2 step 소결법과환원공정을통한 W 결정립성장억제및완전치밀화기술 - 침탄억제공정및후처리공정에의한, 통전활성소결을통한저침탄소결체제조기술 o 금속소재기술 - 통전활성소결법을이용한 Fe-Ni 합금의완전치밀화기술 - 자동차부품용 Fe-M-B-C (M= Ni, Mi, Cu etc) 합금의액상소결과미세구조조절기술 - 핵융합대면소재용 Wceramic(Y 2 O 3, TiC) 복합체개발 o 통전활성소결을통한세라믹복합체소재기술 - 구조재용 Al 2 O 3 /CNT, Al 2 O 3 /RGO 복합체의기계적, 전기적특성향상기술 - WLED 용 YAG:Ce 형광체세라믹및복합체제조기술 - 군수산업용적외선투명세라믹 Y 2 O 3 /MgO 복합체제조기술 Keywords: 통전활성소결, 금속소결, 액상소결, 투명세라믹, 세라믹복합체소결 P-15 고기능성비산화물기반융합소재연구및개발조광연, 신동근, 도환수, 김우식. 한국세라믹기술원본세라믹섬유복합재센터와연구자들은지난 20 년간첨단산업체의핵심부품으로사용되는고기능성비산화물기반융합소재관련엔지니어링세라믹소재기술개발을추진하였으며다음과같은엔지니어링세라믹스관련기술을보유하고있다. o 프리세라믹폴리머기반초고온탄화규소소재관련기술 - 고성능 SiC 섬유용폴리카보실란합성및응용기술 - 초고온프리세라믹폴리머합성기술 o SiC 섬유및복합소재기술 o C 급고온용 SiC 섬유기술 o C 급초고온용결정화 SiC 섬유기술 - 고성능 SiC 나노복합섬유제조기술 - PCS 응용 PIP 복합소재제조기술 o 비산화물소재관련기술 - 방열소재열전도제어및분산성향상 - 비산화물소결체제조및방열기판적용 - 비산화물발열복합체및효율향상 o 고성능 Nano-carbon 기반융복합재제조기술 - 기능성 nano-carbon(graphane, CNTs, etc.) 소재 - 고방열 graphene/cnts/metal 융복합체 - h-carbon 구조치환공정을통한 h-bn nano structure 형성기술 Keywords: 프리세라믹, 융복합재, 비산화물, SiC 섬유, 고기능 P-16 원자력및우주항공용세라믹복합재료제조기술김원주, 박지연, 김대종, 이현근. 한국원자력연구원본연구팀은지난 20 여년간원자력, 우주항공, 에너지산업등에서요구되는세라믹복합재료관련연구개발을수행하였으며 CVD, CVI 등을활용한고순도의탄화물기반구조세라믹스소재제조기술을보유하고있다. o 장섬유강화 SiC/SiC 복합체제조기술 - 튜브형상프리폼제조를위한 SiC 섬유와인딩기술 - Pyrolytic carbon 계면상제조기술 - Chemical vapor infiltration 을이용한고순도 SiC 기지상제조기술 - SiC whisker/nanowire 성장을이용한기지상고밀화기술 - 대면적 SiC 복합체튜브제조기술 ( 직경 150 mm, 길이 300 mm) o 유동층화학기상증착법에의한구형입자코팅기술 - 피복입자핵연료용 Pyrolytic Carbon, SiC, ZrC 코팅기술 - SiC/ZrC 복합코팅기술 o 화학기상증착법에의한초고온용세라믹스 (UHTC) 제조기술 - ZrC, TaC, HfC 등탄화물소재의고순도증착기술 Keywords : SiC, Composite, CVD, CVI, UHTC P-17 고온열전도도를이용하는구조세라믹스기술김성원. 한국세라믹기술원본연구자는지난 10 년간구조세라믹스중고온의열전도도특성을이용하는산화물 비산화물엔지니어링세라믹소재기술에대해연구개발을진행하였으며다음과같은엔지니어링세라믹스관련기술을보유하고있음. o 저열전도성희토류지르코네이트관련기술 - 차세대열차폐코팅용로서의희토류지르코네이트소재기술 - 희토류 (La, Gd) 지르코네이트의상분석 - 저열전도성희토류지르코네이트의결정 / 미세구조와열전도도연관성 o 서스펜션플라즈마용사 (Suspension plasma spraying) 공정기술 - in-situ 합성코팅층제조기술 - 수직분리구조를지니는열차폐코팅의제조기술 - 경사기능 2 층열차폐코팅의제조기술 o 에너지전달용탄화규소소재관련기술 - RBSC 소재의원료 SiC 분말입도와열전도도연관성 - 탄화규소튜브의실형상강도평가 (C-ring test) 및파단면분석 Keywords: 열전도도, 열차폐코팅, 희토류지르코네이트, 서스펜션플라즈마용사, 탄화규소 P-18 진공증착기술을이용한열차폐및내마모코팅기술오윤석. 한국세라믹기술원본연구자는지난 10 년간구조세라믹스중고온환경에노출된금속소재의보호용코팅으로서세라믹열차폐코팅기술에대해연구개발을진행하였으며, 다음과같은세라믹열차폐코팅관련기술을보유하고있다. o 고온열충격저항성세라믹제조기술 - 열차폐코팅용고온열충격저항성지르코니아제조기술 - 소결체제조를위한원료및열처리기술 - 복합조성의고온열충격저항성소재제조적용기술 o 고출력전자빔증발증착공정기술 - 고출력전자빔증착시스템기술 - 주상형구조지르코니아기반열차폐코팅의후막제조기술 - 저열전도및고온내구성코팅구조제어기술 o 하이브리드 PVD 시스템을이용한하드코팅기술 - Cr, Ti 계복합조성하드코팅기술 - 코팅층 Tribological behavior 평가기술 Keywords: 전자빔코팅, 열차폐코팅, 지르코니아, 고열충격저항성소결체, Hybrid PVD, 하드코팅 P-19 입자분산, 기공, 거친표면, sol-gel 구조, 상변태측정중성자극소각산란기술김만호. 한국과학기술연구원본연구팀은재료의구조를마이크론및서브마이크론에서측정 220 한국세라믹학회

241 엔지니어링세라믹스산학연기술교류회 할수있는극소각중성자산란측정장치 (KIST-USANS) 를 2012 년에한국원자력연구원하나로냉중성자실험동내에개발, 구축하였으며, 다음과같이세라믹에관련한다양한측정기술및데이터해석기술을보유하고있음. o 분말입자모양및분산측정기술 - 구형, 원통, 판상등 - 입자크기측정 - 입자의응집및분산측정기술 - 비표면적측정 o 기공측정기술 - 열린기공, 연결된기공, 닫힌기공판별 - 기공함량측정 - 기공간거리측정 - 기공크기측정 o sol-gel 반응 - 액상에서콜로이드입자구조및크기변화측정기술 o 표면거칠기측정기술 - 프랙탈표면, 확산표면, smooth 표면 Keywords: 입자, 기공, 비표면적, 밀도, 중성자극소각산란장치, USANS P-20 반도체장비용세라믹소재이성민, 박상준, 오윤석. 한국세라믹기술원본연구팀은지난 10 년간반도체및디스플레이산업에적용되는세라믹소재의플라즈마식각기구및내플라즈마성소재, 기능성소재에대한연구를진행하여왔음. 신조성을개발하고이를소결체및코팅으로적용하는연구를진행하고있음. o 반도체 / 디스플레이장비용기능성소개 - 히터, 정전척등반도체장비용소재의전기적특성측정기술 - 고열전도도 AlN hot press 기술 o 내플라즈마성평가기술 - 소결체및코팅의식각기구분석및식각율분석 - 세라믹표면오염입자분석 o 내플라즈마소재 - 고밀도 Y 2 O 3 코팅소재개발 - 오염입자저감 YOF 코팅기술개발 Keywords: 질화알루미늄, 내플라즈마성평가, Y 2 O 3, YOF, 코팅 P-21 세라믹 3D 프린팅기술윤희숙. 재료연구소본연구팀은지난 12 년간다양한세라믹을이용하여응용분야및소재의특성에맞는세라믹 3D 프린팅전주기공정기술을개발해왔으며다음과같은기술을보유하고있음. o Material Extruding (ME) system 을이용한세라믹 3D 프린팅기술 - 세라믹소재맞춤형 ME system 기술 ( 단순압출형, 압출 - 광중합복합형 ) - ME system 을위한세라믹패이스트제조기술 - ME system 을이용한각종세라믹 3D 프린팅기술 ( 인산칼슘계, 생체유리, 알루미나, 지르코니아, 질화규소계, 질화탄소계등 ) o ME system 을이용한생체골이식재제조기술 - ME system 을이용한생분해성세라믹골이식재제조공정기술 ( 인산칼슘계, 인산마그네슘계및생체유리계 ) - ME system 을이용한생체불활성세라믹골이식재제조공정기술 ( 알루미나및지르코니아 ) o ME system 을이용한생체세라믹 3D 프린팅실온공정기술 - 인산칼슘계, 인산마그네슘계및생체유리계세라믹골지지체실온공정기술 - 생체세라믹지지체생체기능성고기능화기술 - 세포 / 세라믹동시 3D 프린팅기술 o 세라믹소재맞춤형 Stereolithography (digital light process; DLP) system 기술 - 필름공급형 DLP 기반광중합형세라믹 3D 프린팅시스템기술 - 다종세라믹 3D 프린팅시스템기술 o DLP system 을이용한세라믹 3D 프린팅공정기술 - DLP system 용세라믹슬러리제조기술 ( 알루미나, 지르코니아, 인산칼슘계등 ) - DLP system 을이용한세라믹 3D 프린팅공정기술 - DLP system 을이용한다종세라믹 3D 프린팅공정기술 - 세라믹 3D 프린팅구조체후처리공정기술 Keywords: 세라믹 3D 프린팅, 생체세라믹, 구조세라믹, 재료압출형, 광중합형 P-22 고온구조용비산화물계세라믹스및세라믹섬유강화복합재료기술이세훈, 김준섭. 재료연구소본연구팀은지난 10년간고온산업체에서요구되는비산화물계세라믹스및세라믹섬유강화복합재료관련엔지니어링세라믹소재기술개발을추진하였으며다음과같은엔지니어링세라믹스관련기술을보유하고있음. o 탄화규소관련기술 - 나노탄화규소분말합성기술 ( 입도 200 nm, 순도 99.9%, 소결조제최대 12% 함유가능 ) - 나노탄화규소분말의단분산기술 ( 최대 62 vol% 의고농도슬러리제조가능 ) - 나노탄화규소분말의저온소결기술 ( 가압소결시 1525 o C, 상압소결 1900 o C 치밀화 ) o Ternary carbide (MAX) 소재기술 - Ti 3 AlC 2, Ti 3 SiC 2, Cr 2 AlC의분말합성및치밀화기술 o RBSN ( 반응소결질화규소 ) 관련기술 - RBSN의저온질화및소결기술 ( 질화온도 : 1100 o C, 소결온도 : 1600 o C) - RBSN을이용한저가격의나노질화규소소결체제조 ( 입계크기 : 300 nm) o SiCf/SiC 세라믹섬유강화복합재료 (Ceramic Matrix composites, CMC) 제조기술 - 전구체함침법 (Precursor impregnation and pyrolysis, PIP) 법을이용한 CMC 제조 (φ mm 원통형제조 ) - 섬유내나노 SiC filler의균일함침기술 - PIP 법으로제조된 CMC의고온특성향상기술 (1400 o C) - 저온가압소결법을이용한 CMC 제조 ( 소결온도 1600 o C) o 초고온세라믹스 (Ultra-high Temperature Ceramics, UHTC) 관련기술 - 고순도나노 UHTC 분말합성기술 (ZrB 2, ZrC, HfB 2, HfC, TaC, Ta-Hf-C) - 입도 nm, 금속계순도 > 99.9% (Zr, Hf 제외 ), 산소함량 0.5 wt%, 생산량 170 g/day - UHTC 분말의고농도분산기술 ( 최대 55 vol%) 및무소결조제저온가압소결기술 (14500) - 고순도나노 UHTC-SiC 복합재료제조기술 ( 입계크기 : 한국세라믹학회 221

242 2017 년한국세라믹학회추계연구발표회 nm) - 우수한내삭마특성을갖는 UHTC 제조기술 (oxy-acetylene torch, 27000, 대기중 30분삭마후삭마율 : mm/sec) - 초고온세라믹스섬유강화복합재료 (UHTC-CMC) 제조기술 (SiCf/ZrB 2, Cf/HfB 2 -SiC, Cf/HfC-SiC) Keywords: 탄화규소 (SiC), 질화규소 (Si 3 N 4 ), 초고온세라믹스 (UHTC), 나노분말합성, 나노분말분산, 세라믹섬유강화복합재료 (CMC), SiCf/SiC CMC, UHTC-CMC, 고온구조재료 P-23 다공질세라믹스송인혁, 이종만, 하장훈. 재료연구소본연구은지난 20 년간산업체에서요구되는다공질세라믹스관련엔지니어링세라믹소재기술개발을추진하였으며다음과같은엔지니어링세라믹스관련기술을보유하고있음. o 다공질세라믹스제조기술 - 압출법을이용한대면적다공질세라믹스 Crack-free 건조및소결기술 - 딥코팅법을이용한대면적다공성세라믹스코팅층두께및기공크기제어기술 - 표면개질법을통한수처리용다공질세라믹스내오염성증대기술 o 다공질세라믹스특성평가기술 - 수투과도측정계및통기도계를이용한다공질세라믹스투과특성평가기술확보 - 수은기공도계를이용한다공질세라믹스미세구조분석기술확보 P-24 복잡형상세라믹구조체설계및제작기술배창준. 재료연구소본연구팀또는연구자는복잡형상을갖는엔지니어링세라믹구조체설계및제작관련세라믹소재기술개발을추진하였으며다음과같은엔지니어링세라믹스관련기술을보유하고있음. o 복잡형상구조체제작세라믹 3D 프린팅기술 - 고농도저점도세라믹광경화잉크제조기술 - 탈지중발생된응력제어기술 - 복잡형상세라믹구조체탈지및소결기술 o 리튬이온배터리세라믹소재및공정기술 - 양극, 음극활물질제조기술 - 고용량, 고출력배터리전극설계및제작기술 - 광센서를통한배터리안전성기술 o 정밀주조용코어 - 쉘일체형세라믹몰드 - 정밀주조용세라믹잉크및몰드제작기술 - 세라믹몰드제작공정기술 - 세라믹몰드결정화도및물성제어기술 Keywords: 세라믹 3D 프린팅, 세라믹잉크, 배터리전극, 정밀주조용세라믹몰드 P-25 Ha-Neul Kim, Jae-Woong Ko, Young-Jo Park, Jin-Myung Kim. 재료연구소재료연구소엔지니어링세라믹연구실에서는다양한레벨의소결연구 ( 분말상및다공체부터치밀체까지 ) 와다양한종류의물질연구 ( 산화물에서비산화물까지 ) 를수행하고있다. 그중치밀체연구는다음의두가지소재개발을목표로이루어지고있는데, 첫째는전력반도체의절연기판용으로주목받고있는고열전도도비산화물인질화규소이고둘째는방탄또는적외선윈도우로사용가능한입방정의산화물인스피넬과이트리아투명세라믹이다. - 고열전도도질화규소하이파워응용을위해 Si 전력반도체를대체하는 SiC 전력반도체에대한연구가거듭되어, 2017 년올해안에국산기술에의한제품출시가가능하다는전망이나와있다. 그런데우리나라에서는 SiC 단결정에서부터에피기술, 모듈설계기술및패키징에이르는밸류체인상의거의모든기술이어느정도수준에는올라와있는것에반해전력반도체칩들을집적화하기위한고열전도도세라믹절연기판은현재 missing link 기술로분류되고있다. 재료연구소에서는동소재에대한다년간의지속적인연구를통해고열전도도와고강도를구현가능한신조성소결조제및독자적소성공정법을확보하고있다. - 투명세라믹스 1960 년대초에 GE 에서투광성알루미나를소개한이래다양한종류의세라믹스를진밀도로소결하는기술이개발되어왔다. 특히, 선진국에서는방산응용을타겟으로투명세라믹의대형화에까지성공하고있다. 재료연구소는 2013 년부터우리나라에서는처음으로투명세라믹관련의대형국책과제를수행해오고있는데, 고강도 / 고경도의방탄용스피넬과중적외선윈도우용이트리아연구에집중하여분말전처리 / 성형 / 소결에대한독자적인공정기술을확보하고있는데, 현재는 직경 60 밀리 두께 4 밀리 급의투명한시편이제작가능한수준에도달해있다 Keywords: 전력반도체, 질화규소, 고열전도도, 국방소재, 투명세라믹 222 한국세라믹학회

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255 Aman Bhardwaj P2-S22-9 Amit Siddharth Sharma S32-7, G3-6, G3-7, S32-15, P2-S32-1, S32-1 Andrea Capasso P1-S42-5 Andrea Gnisci P1-S42-5 Andrey Krayev P2-S13-17 Anggia Erdienzy P2-S22-12 Annapureddy Venkateswarlu P3-G1-7 Arathi G3-13, G3-12 Arifin Septiadi S31-9, S32-15, P2-S32-1 Arunava Gupta P2-S13-16 Attaur Rahman S11-6 Beyene Anteneh Marelign P1-G2-6 Bhupendra Singh P2-S22-9 Bijay Basnet P2-S31-12 Brayek Amine P3-G2-32, P3-G2-33, P3-G2-31 Brindha Moorthy P1-G2-7, P1-G2-6 Bukhari Syed Zaighum Abbas S31-6 Ch. Pflieger S31-2 Chandran Balamurugan P1-G2-13 Changhee Sohn S13-14 Chang-Mi Lee S81-8 CHEN ZHILEI P3-G3-19 Christos G. Takoudis S13-14 Cong Wang P2-G1-3 Dang Thanh Nguyen P1-S11-4 Darmawan bobby aditya G5-12 Deu Bhange S21-3 Dianta Ginting P2-S41-6, S41-5 Do Kyung Kim P1-G2-7 Dong Yun Shin S81-8 Dong-Hee Lim S81-8 Emmanuel Defay P3-G1-18 Fatma Pinar Gokdemir P2-S16-6 Ghulam Ali S21-3 Giuliana Faggio P1-S42-5 H. Richter S31-2 Ha Minh Tan P1-S16-7 Haribabu Palneedi P3-G1-7 Himchan Cho S12-5 Ho Nyung Lee S13-14 Hobeom Kim S12-5 Hwang-Pil Kim P1-S11-4 I. Voigt S31-2 IPPILI SWATHI G1-3 J. Richter S31-2 J.G. Fisher G5-12, P1-S11-4 James F. Scott S13-14 James Hone P1-S42-8 Jamil S41-7, P2-S41-10 Jatis Kumar Dash G4-5 Jeong An Kwon S81-8 Joong-Sook Lee P1-S11-4 Jun-Ge Liang P2-G1-3 Junichiro Shiomi S81-1 Jun-Young Park P3-G2-11 Kamala Bharathi P1-G2-7 Kang Taek Lee G2-8 Kati G2-5 Ke Wang P3-G1-18 Kenji Toda G6-2 KHISHIGBAYARKHOSERDENE P1-S33-7, P1-S33-10 Krishna C. Pitike S13-14 Layla Mehdi P2-S13-17 LE GIA PHAN P1-S11-4 Lee Sung Hyuk P2-S41-1 Li Yang P2-S13-17 Lin, Chan-Chieh S41-5, P2-S41-6 Liu Kai G8-4 LYU GUANLIN P1-S33-1, P1-S33-3 M. Rahman S81-7 M. Weyd S31-2 MA XINGHUA P1-S11-8 Mina Yoon S81-2 Ming-Qing Liu P2-G1-3 Minh Dat Nguyen P1-G2-14 Min-Ho Park S12-5 N. Reger-Wagner S31-2 Nenko S. Nenov G3-11 Nguyen Thi Nguyen P2-S13-4 Nguyen Van Du P2-S41-10, S41-7 Nicola Lisi P1-S42-5 Nigel D. Browning P2-S13-17 Parag Banerjee P2-S13-17 PARMAR NARENDRA SINGH P3-G2-34 Paulraj Arun Kumar P3-G1-21 Peddigari Mahesh P2-G1-2 Pham Thuy Linh P1-S11-4 Pipit S32-15, P2-S32-1, S32-7, G3-7 R. Kriegel S31-2 Radhe Agarwal S13-14 RAJA NAREN G5-13 Ram S. Katiyar S13-14 Ricardo Grau-Crespo S81-3 Romain Faye P3-G1-18 Rui Wang P3-G1-3, P2-G

256 Saqib Muhammad P3-G2-11 Serge M. Nakhmanson S13-14 Shuji SAKAGUCHI SS3-1 Siliang Chang S13-14 SIYAR MUHAMMAD S41-6, P2-S41-8, P2-S41-5, P3-G3-7, P2-S41-7 Su-Hun Jeong S12-5 Tae-Woo Lee S12-5 Tai Kyu Lee SS3-3 Takashi Taniguchi P1-S42-8 Teruyasu Mizoguchi S81-11 THAHEEM IMDADULLAH G2-8 Torsten Granzow P3-G1-18 Tran Van Dang G1-10 Ventateswaru Annapureddy P2-G1-1 Wahid Muhamad FR S32-1, G3-6 Wenshen Song P2-S13-17 Wook Jo P1-S11-4 Xuelin Jin P1-G5-5 Yogesh Sharma S13-14 You-Dong Kim P3-G2-11 Young-Hoon Kim S12-5 Zhao Yao P2-G

257 좌장 리스트 237

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259 RM Aloysius Soon 318C Mina Yoon ORNL 318C KAERI 317C KIER 317C KTL KISTI 318A KICET 318A A KCM 318A KICET 318A KICET 327B KICET 327A B A A C KERI UNIST KIST 318C KIMS B A B KICET 318B C A KIER 317A C KIER 317A KICET 317B KIMS B

260 RM KICET 317B KIMS 317B C KIMS 317B B UNIST 327C A KICET 318A KIMS 318C KICET KICET 327A KIER 317A KEIT 327A KICET B KETI 317A UNIST 318B A A KIST 318A KICET KICET 318C C C KOPTI KICET 317B KICET

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262 Powder Tech. Machine Tech. Coating Tech.

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