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 Al 2 O 3 –SiO 2 , Al 2 O 3 –SiO 2 –SiC, and Al 2 O 3 –SiO 2 –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% Al 2 O 3 ) 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.