In this study, we report that effects of a filler with a high coefficient of thermal expansion on a sealant for high-temperature (750 ~850 o C) SOFC. We designed a SiO 2 -BaO-ZnO-B 2 O 3 -Al 2 O 3 glass system with a softening temperature higher than 750 o 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 alongterm heat treatment, the leak rate decreased by about 5% after a heat treatment in an oxidizing atmosphere at 750 o C for 2000 h, also decreasing by about 6% after a heat treatment in a reducing atmosphere at 750 o C for 1000 h.
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