Research in the Field of Preparing Molded and Unmolded Refractories Based on High-Alumina HCBS. Part 6. Mullitization and Thermal Expansion of Materials Based on Compound Composition HCBS1

Abstract

Sintering and mullitization are studied for specimens prepared on the basis of compound composition HCBS in the system bauxite – very fine quartz glass (VFQG), and also with addition of refractory clay. The nature of sintering and mullitization is governed to a considerable extent by SiO₂ content in the original composition (VFQG + clay). Dilatometric studies of specimens previously fired at 1600°C established that depending on composition thermal expansion values in the range 20 – 1000°C are within the limits of 0.5 – 0.6%, which is close or comparable with similar data for pure mullite.