Oxidation Resistance Evaluation of Silicon Carbide Ceramics with Various Additives

Abstract

Five silicon carbide ceramics with various additives were evaluated for oxidation resistance at 1300°C in flowing dry and wet air. In the dry atmosphere, the oxidation of the five samples was diffusion‐controlled, and in wet atmosphere they exhibited a linear relation beween weight gain by oxidation and water vapor content. Water vapor in the atmosphere strongly accelerated oxidation. The influence of oxidation on room‐temperature strength was complex, but the samples were not as affected by oxidation.