Chiang Mai Journal of Science

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A barium-calcium silicate glass for use as seals in planar SOFCs with a chemical composition of 40.78mol%BaO-4.36mol%CaO-0.62mol%Al₂O₃-0.83mol%B₂O₃-47.41mol%SiO₂ was studied. Its coefficient of  thermal expansion (CTE) between 25-640^oC, glass transformation temperature (T_g) and softening temperature (T_s), determined by dilatometry, were 10.6x10^-6oC^-1, 646^oC and 694^oC, respectively. Isothermal devitrification heat treatment at 800^oC, which is in the intermediate operation temperature range of  planar SOFCs, revealed surface crystallization of various crystalline phases identified by XRD and SEM-EDS as BaAl₂Si₂O₈ (hexacelsian), BaSiO₃ and BaCa₂Si₃O₉ Kinetics of devitrification followed the . Johnson-Mehl-Avrami-Kolmogorov relationship with the Avrami exponent of  1.4. The overall CTE of  the obtained glass-ceramic after the isothermal devitrification heat treatment was comparable to that of  the glass. Adhesion test between the glass and the other components including YSZ and stainless steel grade AISI430 revealed that good union was achieved. The interfacial phenomena were studied by SEM-EDS and the mechanism of bonding were discussed.

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