Research in the Field of Preparing Molded and Unmolded Refractories Based on High-Alumina HCBS. Part 9. Preparation and Properties of Mixed HCBS Composition: Fuzed Bauxite-Corundum, Quartz Glass, Reactive Alumina. Dilatometric Study of Materials Based on Them

Resumo

Combined wet comminution is used to prepare HCBS of composite composition, including fuzed bauxite-corundum as a basic material (89%) and very fine fuzed quartz (11%). Specimens are also based on this HCBS with an increased Al₂O₃ content due to introducing 10 – 30% reactive alumina into their composition. Dilatometric studies are performed making it possible to establish that for materials of all compositions there are four typical nonisothermal heating temperature ranges: normal thermal expansion (up to 900°C), sintering or shrinkage (900 – 1300°C), mullitization or growth (1300 – 1450°C), and sintering (shrinkage) of mullitized material (1450 – 1500°C).