Making low-porosity materials with improved thermal resistance on the basis of corundum with added ZrO2, Si3N4, AlN, and SiO2

Added ZrO2, Si3N4, AlN, and SiO2 affect the consolidation of aluminum oxide on sintering in nitrogen, vacuum, and air, as well as affecting the therma l resistance of the materials. The relative density of material based on Al 2O3 is largely dependent on the type and amount of additive, the component ratio, and the sintering medium. High density and thermal stability occur i n materials formed by sintering in nitrogen from aluminum oxide containing ZrO2, Si3N4 Md SiO2.