Research in the Area of Preparing Materials Based on Fuzed Quartz HCBS. Part 6. Effect of Firing Temperature on Material Sintering and Cristobalitization

The effect of firing temperature in the range 1000 - 1350A degrees C on indices for shrinkage, porosity, density, and strength of specimens based both fuzed quartz HCBS with different fineness, and cast system with a granular filler based upon them, is studied. Maximum indices for ultimate strength in bending are achieved after firing in the range 1200 - 1250A degrees C. Strength values for different materials are within the limits of 6 - 9%.With a further increase in firing temperature in spite of an increase in density material strength is reduced as a result of cristobalite formation. It is shown that a fundamental factor governing sintering kinetics is starting fuzed quartz viscosity in the corresponding temperature range.