Cement-Free Refractory Concretes. Part 2. High-Alumina and Corundum Ceramic Concretes1

On the basis of refractory bauxite and very fine quartz glass (VFQG) by means of stagewise combined wet grinding HCBS are prepared having a low moisture content and good binder properties that are achieved due to an optimum content within them of very fine particles (nano-particles and colloidal component). These HCBS are used as a matrix system in the manufacture of many forms of ceramic concrete in the systems Al2O3–SiO2, Al2O3–SiO2–SiC, and Al2O3–SiO2–SiC–C. All of them are distinguished by improved thermomechanical and operating properties. Based on electrocorundum and VFQG similar HCBS and corundum ceramics are prepared (95% Al2O3) with their use. Corundum ceramic concretes are prepared based on a vibration-cast mixture with a moisture content of 3.8% having porosity up to 11% and good strength at elevated temperature.