This study investigated the degradation in mechanical properties of an alumina subjected to thermal shock loading by systematic experiments on bend-bar specimens of two sizes, 3 x 4 x 45 mm and 9 x 12 x 45 mm. ΔT_c values for the large and small specimens were found to be 175 and 200℃, respectively. The reduction in thermal shock resistance with increasing sample size can be well described by the thermal elastic and fracture energy theories. However, if the size effect on the initial, unshocked fracture strength is considered, the size effect on the transport of heat during quench test might play a less important role in reducing the thermal shock resistance of large specimen.
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