Evaluation Model of Critical Thermal Shock Resistance Temperature Difference for Engineering Ceramics

Traditional thermal shock resistance theories cannot be used for quantitative evaluation of thermal shock property of ceramics. To solve this problem, a novel model of thermal shock resistance for engineering ceramics was developed on the basis of traditional theories and previous research achievements. In this model, the critical thermal shock resistance temperature difference Tc was calculated using mechanical and thermal parameters of ceramics, and the effect of fracture toughness on thermal properties was discussed for the first time. The model can be used for qualitative and even half quantitative evaluation of the thermal shock property of ceramics. To verify the proposed model, thermal shock resistance experiments were performed on different series of ceramics, including those with different characteristics (dense and porous ceramics) and those with different typical structures (bulk and laminated ceramics). The results indicate that the experimental Tc was close to the calculated value, with an average error rate of about 5%.