Evaluation on Properties of CaO-BaO-B2O3-Al2O3-SiO2 Glass-Ceramic Sealants for Intermediate Temperature Solid Oxide Fuel Cells

doi:10.1016/j.jmst.2012.11.011

Abstract

Abstract:

To develop suitable sealants for intermediate temperature solid oxide fuel cells (IT-SOFC), glass–ceramics based on the CaO–BaO–B₂O₃–Al₂O₃–SiO₂ system were studied. Coefficient of thermal expansion (CTE), glass transition temperature (T_g) and dilatometric softening point temperature (T_d) of specimens were determined by means of dilatometer analysis and crystallization temperature was measured by differential thermal analysis (DTA). Also, crystallization behavior during prolonged heat-treatment and microstructure properties were studied by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Electrical properties were measured at different temperatures, and the results showed a high resistance (>10⁴ Ω) at the SOFC operation temperature (600–800 °C). Moreover, mechanical properties of heat-treated specimens (1, 10, 30, 50 h) were measured. Microstructure investigation revealed a well-adhered bonding between the sealant glass–ceramic electrolyte and glass.

Key words: Glass, Solid oxide fuel cells (SOFC), Thermal expansion, Mechanical properties, Electrical properties

Fatemeh Heydari, Amir Maghsoudipour, Zohreh Hamnabard, Sajad Farhangdoust. Evaluation on Properties of CaO-BaO-B₂O₃-Al₂O₃-SiO₂Glass-Ceramic Sealants for Intermediate Temperature Solid Oxide Fuel Cells[J]. J. Mater. Sci. Technol., 2013, 29(1): 49-54.

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Evaluation on Properties of CaO-BaO-B₂O₃-Al₂O₃-SiO₂Glass-Ceramic Sealants for Intermediate Temperature Solid Oxide Fuel Cells

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