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Density and Thermal Expansion Measurements of Several Mixed Oxide Glasses in the Solid and Liquid Regions

机译：固体和液体区域中几种混合氧化物玻璃的密度和热膨胀测量

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The density and thermal expansion of a number of mixed oxide glasses were measured in the solid and liquid regions by gamma densitometry. With this non-contacting technique, both physical regimes may be investigated as the temperature is varied and the glass viscosity varies over a wide range. Where rate-dependent crystallization can occur, the technique allows the continuous measurement of density as the liquid cools to a supercooled glass or a crystalline solid. Lead borate glasses were investigated in the range from 27 to 42 mol % PbO. The liquid phase volumetric thermal expansion coefficient was observed to decrease with increasing PbO content, in contrast to the solid phase linear thermal expansion coefficient. In soda-baria phosphate glasses (50 mol % P sub 2 O sub 5 ), liquid phase volumetric expansion coefficients were found to vary as the solid phase linear expansion coefficients. Two soda-alumina silicate glasses (60 mol % SiO sub 2 ) were investigated as well. Measurements on a lithia-aluminosilicate glass ceramic were obtained by this method to approximately 400 exp 0 C above the limit of conventional dilatometry, thereby allowing the measurement of the thermal expansion of high temperature crystalline phases, as well as the liquid phase density. (ERA citation 10:013742)

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