Compatibility of mica glass-ceramics as gas-sealing materials for SOFC

Compatibility of mica glass-ceramics as gas-sealing material for solid oxide fuel cells (SOFC) has been investigated. Thermal expansion behavior and refractoriness were roughly suitable for SOFC constituent materials. The mica glass-ceramics joined solid electrolyte (8 mol% yttria-stabilized zirconia, 8YSZ) to separator (calcium doped lanthanum chromite, La0.8Ca0.22CrO3) in the temperature range of about 1000 to 1300 degrees C. The mica glass-ceramics are chemically stable to electrolyte and a serious chemical reaction was not observed through the connected interface between mica glass-ceramics and electrolyte. The joining between mica glass-cermics and separator was caused by the melting of residual glass matrix and an intermediate layer was formed by chemical reactions at the interface. A single cell unit consisted of a single cell and two separators was made using this mica glass-ceramics.