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In this study, we explored the thermal and mechanical properties of a SiO2-B2O3-ZnO-K2O-Na2O (SBZKN) glass compositionfor potential use in vacuum insulated glass windows. The glass's physical properties were controlled through the mixedalkali effect, with K2O and Na2O serving as network modifiers, maintaining a fixed total of 20%. The SBZKN compositionpowder vitrified below 1000 °C. Varying the K2O content from 0% to 20% resulted in reduced density and hardness of theglass specimen. DTA analysis indicated decreasing glass transition temperature (Tg) and crystallization temperature (Tp)with higher K2O content, reaching a minimum at 10%. The coefficient of thermal expansion peaked at 10% K2O content,and thermal conductivity was lowest with 15% K2O content. Heating a cube-shaped glass specimen (700 to 800 ℃) causedsemicircular spreading due to glass viscosity. Contact angle between spread glass and substrate decreased with temperaturebut generally increased with K2O content. At 800 ℃, all specimens showed excellent wetting with contact angles of 44° to72°. This study provides evidence of alkali mixing effects on thermal and mechanical properties, contributing vital data forfuture vacuum insulated glass window design and development.
