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http://dx.doi.org/10.4191/kcers.2013.50.6.470

The Effects of a Filler with a High Coefficient of Thermal Expansion on a Sealant for High-Temperature (750 ~ 850℃) SOFCs  

Kim, Bit Nam (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology)
Lee, Mi Jai (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology)
Hwang, Jong Hee (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology)
Lim, Tae Young (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology)
Kim, Jin Ho (Optic&Display Material Team, Korea Institute of Ceramic Engineering and Technology)
Hwang, Hae Jin (School of Material Science and Engineering, Inha University)
Kim, Il Won (CERA Co. Ltd.)
Chung, Woon Jin (Division of Advanced Materials Engineering, Kongju National University)
Publication Information
Journal of the Korean Ceramic Society / v.50, no.6, 2013 , pp. 470-475 More about this Journal
Abstract
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.
Keywords
High coefficient of thermal expansion; Filler; SOFC; Seal; Sealant;
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Times Cited By KSCI : 1  (Citation Analysis)
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