陶瓷材料的预应力增强已经被证明有效，但是这种表面预应力对其他力学性能的影响如何仍不明晰，本工作将探讨表面残余压应力对复合构件的综合力学性能的影响，包括弯曲强度、弹性模量、断裂韧性、硬度以及损伤容限。为了实现表层压应力以及相适配的界面剪切应力，按质量分数比1∶1将莫来石和氧化铝混合磨成浆料涂覆在预烧后的氧化铝基体上，经无压烧结后，涂层与基体紧密结合，随着温度下降，2种材料不同的收缩率和界面约束形成表层残余压应力，从而实现氧化铝复合陶瓷的预应力强化，进而测试了该材料的各项力学性能。结果表明：预应力涂层有效提高了基体材料的弯曲强度，提高了38.9%；断裂韧性提高了36.5%，弹性模量稍降、硬度下降代表了涂层材料的性能。通过这些力学参数，计算得到复合氧化铝陶瓷的损伤容限从0.389 4 m1/2提升至0.452 7 m1/2，提高了16.26%。

The prestressing reinforcement has been proved to be effective for ceramics, but how this surface prestressing affects other mechanical properties is still unclear. The influence of surface residual compressive stress on the mechanical properties of composite members, including bending strength, elastic modulus, fracture toughness, hardness and damage tolerance are investigated in this work. In order to achieve suitable surface compressive stress and the appropriate interface shear stress, mullite and aluminum oxide are mixed and ground into a slurry with a mass fraction ratio of 1∶1 and coated on the pre-sintered alumina substrate. The coated samples were prepared by pressureless sintering. With the temperature drop, different shrinkage rates and interface constraints of the two materials form the residual compressive stress in the surface layer. Mechanical properties of the coated alumina were tested. The experimental results show that the prestressed design can effectively improve the bending strength of alumina by 38.9%; The fracture toughness is increased by 36.5%, and the elastic modulus and hardness are slightly decreased. The damage tolerance of the prestressed ceramic is increased from 0.389 4 m1/2 to 0.452 7 m1/2, which is 16.26% higher.