Mixed alkali effect on the thermal properties of SiO2-B2O3-ZnO-K2O-Na2O glass system
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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.
Abstract
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.
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