Research in the Field of Preparing Molded and Unmolded Refractories Based on High-Alumina HCBS. Part 10. Effect of Firing Temperature on Properties of Materials Prepared Based on Mixed Composition HCBS from Fuzed Bauxite-Corundum, Quartz Glass, and Reactive Alumina1

Resumo

The effect of firing temperature of the properties of materials prepared on the basis of complex composition HCBS with a different Al₂O₃ and SiO₂ content is studied. Three typical isothermal firing temperature ranges are established for materials of all compositions: predominantly sintering or shrinkage (900 – 1200°C), predominantly mullitization, accompanied by growth (1200 – 1400°C), and mullitized material sintering (1400 – 1600°C). Comparative analysis is provided for material sintering and mullitization in nonisothermal heating regimes and with isothermal firing. It is established that even during heating to a prescribed firing temperature a marked reduction in porosity and considerable sintering or mullitization are noted.