| 고온 (750 ~ 850℃) SOFC용 밀봉재의 특성에 미치는 고열팽창계수를 갖는 필러의 영향 |
| 김빛남, 이미재, 황종희, 임태영, 김진호, 황해진1, 김일원2, 정운진3 |
한국세라믹기술원 광디스플레이소재팀
1인하대학교 신소재공학부
2세라
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 |
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| ABSTRACT |
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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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