ケイ酸塩ガラスの粘度ガラス転移点及びビッカース硬度に対する微量水分の影響

作花 済夫, 松下 和正, 渡辺 勉, 神谷 寛一

doi:10.2109/jcersj1950.89.1034_577

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けい酸塩ガラスの粘度，ガラス転移点及びビッカース硬度に対する微量水分の影響
Effects of Small Amounts of Water on the Viscosity, Glass Transition Temperature and Vickers Hardness of Silicate Glasses
ケイサンエンガラスノネンドガラステンイテンオヨビビッカースコウ

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A soda-lime-silica and an alkali lead silicate glass with varying amounts of water between 0.009wt% and 0.085wt% and between 0.009wt% and 0.063wt%, respectively, were prepared by heating in dried nitrogen and bubbling water vapor. Low temperature viscosities, thermal expansion coefficients, glass transition temperatures and Vickers hardnesses of these glasses were measured as functions of the water content. The decrease in logη at 550°C was about one for the increase of the water content of 0.76wt% in the soda-lime-silica glass and of 0.054wt% in the alkali lead silicate glass. No systematic variation with the water content was observed for the thermal expansion coefficient. The glass transition temperature was lowered by about 25°C for the increase of the water content mentioned above. The Vickers hardness was lowered with increasing water content; it decreased from 480kg/mm² for 0.009wt% water to 440kg/mm² for 0.085wt% water for the soda-lime-silica glass and from 430kg/mm² for 0.009wt% water to 395kg/mm² for 0.063wt% water for the alkali lead silicate glass. These changes in properties were explained on the basis of the concept that water produces weak break points in the structure of glass.

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窯業協會誌

窯業協會誌 89 (1034), 577-584, 1981

公益社団法人日本セラミックス協会

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