【摘要】 以ZrO2 为基本组成相的层状材料 ,采用干法成型工艺 ,通过对表面层不同组分Al2 O3+ZrO2 和表面厚度的系统研究和设计 ,提出设计三层结构复合陶瓷层裂参数λ ,当λ小于 1.5时 ,表面层不会出现层裂 ,整体材料性能较好 .研究表明 ,表面残余压应力的存在 ,使得三层结构复合陶瓷较单层结构陶瓷表现出更高的强度、硬度、断裂韧性和其他性质 .45 %Al2 O3/ZrO2 / 45 %Al2 O3层状复合陶瓷的弯曲强度达 682MPa,断裂韧性达 16.2MPa·m1 /2 ;而单层ZrO2 陶瓷的弯曲强度和断裂韧性分别仅为 45 0MPa和 8.8MPa·m1更多还原

【Abstract】 The simple die_pressing technique was used to fabricate three layer Al 2O 3/ZrO 2 laminated ceramics in the form of film/substrate systems. The variable surface composition and surface thickness allow the designer to control the magnitude of the residual stresses in the outer layer to attain high strength, hardness and toughness. The study proves that strength and toughness of the 45%Al 2O 3/ZrO 2/45%Al 2O 3 lamination ceramics are 682 MPa and 16.2 MPa·m 1/2 respectively, and the ZrO 2 monalayer ceramics only are 450 MPa and 8.8 MPa·m 1/2 respectively. A critical non_dimensional parameter λ is introduced to evaluate whether cracking occurs or not.更多还原