Hot‐pressed SiC was oxidized at temperatures from 900° to 1300°C, and the fracture toughness was determined by the indentation method. The apparent fracture toughness of the surface layers increased with oxidation temperature and then decreased. The observed variations in apparent fracture toughness were consistent with earlier observations of strength variations in oxidized SiC. Some specimens were fractured, and the fracture surfaces were characterized. Based on these observations, the variations in fracture toughness were attributed to variations in residual compressive stresses induced by oxidation.
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Zdaniewski et al. (1987) studied this question.
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