Research in the Area of Preparing Materials Based on Fuzed Quartz HCBS. Part 7. Study of Centrifugally Molded Refractory Sintering and Cristobalitization1

Resumo

The effect of nonisothermal heating temperature in the range 1100 – 1500°C on shrinkage indices and and degree of cristobalitization is studied for quartz steel-pouring refractory specimens with a ceramic concrete structure. Cristobalite formed at elevated temperature has a reduced (150 – 220°C) transition temperature into the low-temperature form. Quartz steel-pouring refractories with a ceramic concrete structure have good thermal shock resistance, and in contrast to corundum-graphite refractories, requiring preliminary high-temperature heating, may operate without the latter (“cold start”).