Evaluation of the thermal resistance of structural ceramic upon testing of notched prismatic samples

An approach to determining the thermal stability of structural ceramics by thermal cycling of specimens with a special notch is considered. Characteristics of thermal shock resistance are proposed: the magnitude of the loss of crack resistance after thermal shock, the insensitivity of the material structure to defects formed at the apex of the notch as a result of thermal shock, and the degree of their accumulation at the apex of the notch. The test results are given for ceramics made of Al ₂ O ₃ , ZrO ₂ , partially stabilized with Y ₂ O ₃ (molar fraction 3%), and cermet ZrO ₂ -Y ₂ O ₃ (molar fraction 3%) with the addition of metallic chromium (volume fraction 50%). Tab. 3, ill. 6, bibliography: 10 titles.