研究了三种 Al_2O_3陶瓷的损伤状态随热震温差变化的趋势。热震温差超过1000℃,致密、细晶的 Y-Al_2O_3陶瓷出现残存强度回升和相应的声衰减幅度下降。这是高温下呈粘滞态玻璃相于淬冷的瞬间吸收了部分能量,相应缓和了热震损伤作用的反映。基于共同的物质结构和显微结构,损伤陶瓷的断裂参数(σR,K_1C,γf)和声学参数(σ,ν_L,E)之间有良好的对应关系。 The damage states of three kinds of Al_2O_3 ceramics were studied with the change of thermal shock temperature difference. Thermal shock temperature difference exceeds 1000 ℃, dense and fine grain Y-Al_2O_3 ceramics appear residual strength rise and the corresponding sound attenuation decreased. This is a high temperature glass was viscous in the quenching moment absorbed some of the energy, the corresponding mitigation of thermal shock damage reflected. Based on the common material structure and microstructure, there is a good correspondence between the fracture parameters (σR, K_1C, γf) and the acoustic parameters (σ, ν_L, E) of the damaged ceramic.