Investigation of crystallization kinetic of SrO–La2O3–Al2O3–B2O3–SiO2 glass and its suitability for SOFC sealant

Abstract Strontium–lanthanum–aluminoborosilicate (SrO–La 2 O 3 –Al 2 O 3 –B 2 O 3 –SiO 2 ) (SLABS) glass was prepared for sealant material in planar Solid Oxide Fuel Cells (pSOFC). Differential Thermal Analysis of the glass showed the formation of two crystalline phases, first one 807 °C and the second phase at 1021 °C. Crystallization kinetic of the first crystalline phase was investigated by differential thermal analysis (DTA) and using the JMA-kinetic model. The activation energy for crystallization was calculated to be 114.04 kJ/mol with frequency factor 5.9 × 10 3 . Coefficient of Thermal Expansion (CTE) of the glass was measured to be 9.72 × 10 −6 /°C. Optical band gap of the glass was measured to be 3.07 eV. Conductivity measured by Impedance spectroscopy found to be 5.68 × 10 −7  S cm −1 at 600 °C and it increased with temperature to 2.68 × 10 −6  S cm −1 at 800 °C. Activation energy for electrical conduction was measured to be 66.12 kJ/mol. Wetting behavior of the glass on a ferritic steel substrate was investigated under hot stage microscopy. It showed initial deformation temperature (IDT) 754 °C, softening temperature (ST) 840 °C, hemispherical temperature (HT) 1108 °C and flow temperature (FT) 1279 °C.