EFFECTS OF THE SiO2-B2O3 RATIO ON THE STRUCTURE AND PROPERTIES OF B2O3-ZnO-SiO2-BaO-LiO2-Al2O3-Na2O-CaO PARENT GLASS AND GLASS-CERAMICS

The experimental results show that a decrease in the SiO2/B2O3 ration reduced the glass transition temperature, but had little effect on the crystallisation temperature. The basic glass powder pressed into strip samples were sintered at a temperature of 630 to 690 degrees C. With a decrease in the SiO2/B2O3 ratio, the structure of glass and glass-ceramics changed, and the same change also occurred in the crystal phase in the glass-ceramics. When the SiO2/B2O3 ratio was 0.29, the glass-ceramics sintered at 670 degrees C reached the best properties, including the bending strength, density, and acid resistance. When the SiO2/B2O3 ratio was 0.29, the coefficient of thermal expansion of the glass-ceramics sintered at different temperatures were maintained in the range of 6.3 - 7.2 x 10(-6) K-1.

Automated summary

The experimental results show that a decrease in the SiO2/B2O3 ratio reduces the glass transition temperature, but has little effect on the crystallisation temperature. The structure of glass and glass-ceramics, as well as the crystal phase in the glass-ceramics, changes with a decrease in the SiO2/B2O3 ratio. Glass-ceramics sintered at 670 degrees C with a SiO2/B2O3 ratio of 0.29 exhibit the best properties, including bending strength, density, and acid resistance. The coefficient of thermal expansion of the glass-ceramics sintered at different temperatures is maintained in the range of 6.3 - 7.2 x 10(-6) K-1 when the SiO2/B2O3 ratio is 0.29.