Effect of Temperature Dependence of Material Properties on the Critical Quenching Temperature Difference under Thermal Shock Test of Ceramics

Abstract

The critical temperature difference Δθc was determined by the water quenching test for two differently sized ceramic specimens to study the effects of temperature dependence of material properties and heat transfer coefficient on the thermal shock resistance of ceramics. The observed Δθc at each Biot number β were compared with those calculated numerically, considering the temperature dependence of material properties and heat transfer coefficient h in the thermal conduction equation. The Δθc changed with the size of the specimen, but the thermal shock fracture resistance R was constant for the same type ceramics. Therefore, it was suggested that the R was independent of β and useful for the evaluation of thermal shock resistance.