Network structure and thermal property of a novel high temperature seal glass
In this study, novel glasses based on SrO–La2O3–Al2O3–B2O3–SiO2 system are investigated for solid oxide fuel and electrolyzer cells. The network structure evolution of the glasses with increasing B2O3:SiO2 ratio was studied using Raman spectroscopy. The thermal properties of the glasses, including glass transition temperature Tg and glass softening temperature Td, were studied using dilatometry. The thermal stability of the glasses was investigated using X-ray diffraction. The study shows that as the B2O3:SiO2 ratio increases, the SrO–La2O3–Al2O3–B2O3–SiO2 glass micro-heterogeneity and the amount of non-bridging oxygen atoms increase. Correspondingly, the Tg of the SrO–La2O3–Al2O3–B2O3–SiO2 glasses changes from 635 to 775°C, and the Td changes from 670 to 815°C. Glass thermal stability decreases with B2O3:SiO2 ratio increase. The glass without B2O3 is thermally stable after being kept at 850°C for 200 hrs.
PACS33.20.Fb 61.05.Cp 68.60.Dv 64.70.Ph
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