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J. Korean Ceram. Soc. > Volume 50(6); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(6): 470.
doi: https://doi.org/10.4191/kcers.2013.50.6.470
고온 (750 ~ 850℃) SOFC용 밀봉재의 특성에 미치는 고열팽창계수를 갖는 필러의 영향
김빛남, 이미재, 황종희, 임태영, 김진호, 황해진1, 김일원2, 정운진3
한국세라믹기술원 광디스플레이소재팀
1인하대학교 신소재공학부
3공주대학교 신소재공학부
The Effects of a Filler with a High Coefficient of Thermal Expansion on a Sealant for High-Temperature (750 ~ 850℃) SOFCs
Bit Nam Kim, Mi Jai Lee, Jong Hee Hwang, Tae Young Lim, Jin Ho Kim, Hae Jin Hwang1, Il Won Kim2, Woon Jin Chung3
Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology
1School of Material Science and Engineering, Inha University
2CERA Co. Ltd.
3Division of Advanced Materials Engineering, Kongju National University
In this study, we report that effects of a filler with a high coefficient of thermal expansion on a sealant for high-temperature ($750{sim}850^{circ}C$) SOFC. We designed a $SiO_2-BaO-ZnO-B_2O_3-Al_2O_3$ glass system with a softening temperature higher than $750^{circ}C$. The properties of the glass system show not only low volumetric shrinking but also low swelling. The glass system did not create a crystal phase during along-term heat treatment. We fabricated a seal gasket with 0, 10, 15, and 20 wt% cristobalite added as filler materials with glass powder. The coefficient of thermal expansion of the seal gasket increased according to cristobalite content. During along-term heat treatment, the leak rate decreased by about 5% after a heat treatment in an oxidizing atmosphere at $750^{circ}C$ for 2000 h, also decreasing by about 6% after a heat treatment in a reducing atmosphere at $750^{circ}C$ for 1000 h.
Key words: High coefficient of thermal expansion, Filler, SOFC, Seal, Sealant
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