Effect of increasing corundum on mechanical properties of silicon carbide refractories

Oxide materials such as Al2O corundum has a great influence on the mechanical and oxidation properties of refractory or refractory materials. In this paper, the effect of Al2O3 powder density, apparent porosity, linear shrinkage, and oxidation resistance of SiC composite refractory materials is investigated. Meanwhile, the compressive and flexural strengths were investigated before and after heat treatment. The mechanisms of oxidation resistance of SiC composite refractory materials have been investigated by using atmospheric heating at temperatures above 1400°C. The microstructures and phases, that formed in this research, have been investigated by corundum enhancement, using (SEM) scanning electron microscopy. Increasing the amount of Al2O3 reduces the linear shrinkage and consequently increases the density and mechanical strength. Moreover, with the maximum values ​​obtained by adding Al2O3 at 8 wt%, the flexural strength was initially increased and then decreased.