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Abstract

This study demonstrates the enhanced thermal expansion coefficient of mica based glass-ceramic composite synthesized by mixing of alkaline boroaluminosilicate glass, K2O-MgO-SrO-B2O3-Al2O3-SiO2 and fluorophlogopite mica (KMg3AlSi3O10F2) glass-ceramic. High glass transition temperature (698 °C) and softening point (733 °C) was experienced by DSC and dilatometry for this alkaline boroaluminosilicate glass. Opaque fluorophlogopite mica glass-ceramic was obtained from SiO2-MgO-Al2O3-B2O3-K2O-F glass by controlled heat-treatment at 1000 °C based on DSC thermograph. Composites were prepared by mixing the high thermal expansion (11.26 × 10-6/K at 50-800 °C) mica glass-ceramic and alkaline boroaluminosilicate glass (having thermal expansion = 6.03 × 10-6/K at 50-700 °C) by wet mixing technique in isopropyl alcohol. XRD pattern of the glass/ glass-ceramic composites, heat-treated at 900 °C for 2 h followed by 800 °C for 10 h duration, confirms the presence of predominant fluorophlogopite mica, KMg3AlSi3O10F2 phase. Thermal expansion value significantly increased with the content of mica glass-ceramic in the glass/glass-ceramic composite mixture. It is found that the thermal expansion coefficient (50-800 °C) of composite prepared by mixing 90 boroaluminosilicate glass: 10 fluorophlogopite mica (wt. %) is 10.47 × 10-6/K and increased to 10.87 and 10.91 × 10-6/K for 80:20 and 70:30 system, respectively. Mica glass-ceramic composites with such higher thermal expansion value (> 10.5 × 10-6/K) can be applicable for SOFC sealing purpose.

Keywords

Glass Glass-ceramic Composite Thermal expansion

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