BaO-B2O3-SiO2-Al2O3 sealing glass for intermediate temperature solid oxide fuel cell

Glasses in the formulation close to BaSiO3-BaB2O4 eutectic compound are developed for sealing of intermediate-temperature (500-650 degrees C) solid oxide fuel cell (IT-SOFC). Thermal and microstructural analyses of the glasses with 0-10 mol% Al2O3 are also conducted. Detailed crystallization kinetics and interfacial stability of the glass in contact with yttria-stabilized zirconia (YSZ) and samaria-doped ceria (SDC) are investigated and compared. The results show that the formulation, 47BaO-21B(2)O(3)-27SiO(2)-5Al(2)O(3) (G1A5), performs the best on glass forming ability (GFA) among all tested formulations, and shows matched thermal expansion and working temperature to CeO2-based electrolytes of IT-SOFC. Two major crystalline phases that precipitate from G1A5 above 750 degrees C are platy hexacelsian and BaSiO3 grains. (C) 2011 Elsevier B.V. All rights reserved.