The potential of aluminosilicate glass ceramics based on the AO-SiO_2-Al_2O_3-B_2O_3 system (A = Ba, Ca, Mg) was investigated by systematic fundamental investigations. 13 different compositions were considered to determine also the influence of different Al_2O_3 concentrations and of nucleating agents in the MgO containg sealants. Glasses were obtained by the quenching of melts. Their characteristic temperatures, crystallization, and crystallization kinetics were determined. Electrical conductivities and component volatilities were additionally obtained for the sealants. Extensive studies revealed the chemical interactions at the interface between the sealants and the SOFC component materials, Ni and 8YSZ for the anode, 8YSZ for the electrolyte, as well as the oxide dispersion strengthened (ODS) alloy Cr5FelY_2O_3 and a ferritic steel for the interconnect. The results showed that aluminosilicate glass ceramics have a high potential for the development of sealants for SOFC. Guidelines for the development are given.
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