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J. Korean Ceram. Soc. > Volume 42(12); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(12): 842.
doi: https://doi.org/10.4191/kcers.2005.42.12.842
SOFC용 유리-세라믹섬유 복합기밀재의 고온 기체누설 거동
이재춘, 권혁천, 권영필, 박성, 장진식1, 이종호2, 김주선2, 이해원2
명지대학교 신소재공학과
2한국과학기술연구원 나노재료연구센터
High Temperature Gas Leak Behavior of Glass-Ceramic Fiber Composite Seals for SOFC Applications
Jae-Chun Lee, Hyuk-Chon Kwon, Young-Pil Kwon, Sung Park, Jin-Sik Jang1, Jongho Lee2, Joosun Kim2, Hae-Won Lee2
Department of Materials Science and Engineering, Myongji University
1Byucksan Corp
2Nano-Materials Research Center, Korea Institute of Science and Technology
Glass composites containing ceramic fiber have been developed for Solid Oxide Fuel Cell (SOFC) seals. Effect of glass type, loading pressure and thermal cycle the leak rates of composite seals was investigated. Seal performance of two commercial glasses was compared with that of $SiO_2BaO-B_2O_3$ glass synthesized in this work. The leak rate for seals made of pyrex(R) increases from $~0.0005;to;~0.004sccm/cm$ as the gas pressure increases from 10 to 50 kPa. The soda lime silicate glass seal shows the leak rate two times higher than the one made of pyrex(R) or $SiO_2BaO-B_2O_3$ glass. The viscosity of glass at the seal test temperature is presumed to affect the leak rate of the glass seal. As the applied loading pressure increases from 0.4 to 0.8 MPa at $750^{circ}C$, the leak rate decreases from 0.038 to 0.024 sccm/cm for composite seals. It has been found that during 50 thermal cycles between $450^{circ}C;to;700^{circ}C$ leak rates remained almost constant, ranging from 0.025 to 0.03sccm/cm. The results showed an excellent thermal cycle stability as well as sealability of the glass matrix ceramic fiber composite seals.
Key words: Ceramic fiber, Glass, Seal, Leak rate, Solid oxide fuel cell
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