氧化锆层状复合陶瓷表面压应力与相变增韧的关系  

Relationship between Surface Compressive Stresses and Transformation Toughening of ZrO_2 Laminated Ceramics

作　　者：陈蓓[1] 程川[2] 王里奥[2] 黄川[2] 

机构地区：[1]重庆大学高电压与电工新技术教育部重点实验室 [2]重庆大学资源与环境工程学院,重庆400044

出　　处：《材料科学与工程学报》2005年第6期806-809,共4页Journal of Materials Science and Engineering

摘　　要：利用维氏硬度仪和X射线应力分析仪、X射线衍射仪等手段分别对单层和层状氧化锆陶瓷进行了力学性能测试和分析,研究结果表明,在ZrO2层状复合陶瓷中,压痕裂纹的形成除了因塑性区体积变化产生的残余应力外,还与相变应力和表面压应力有关,表面压应力对表面裂纹具有较大的抑制作用。层状陶瓷断裂韧性提高,主要是通过表面压应力对压痕裂纹区应力强度因子的贡献、提高断裂相变量,强化相变增韧效果、细化晶粒等几个方面来实现的。The mechanical test and analysis have been done between the monolithic and layered ZrO2 ceramics by hardness machine, X-rays stress analyses and X-rays machines etc. The results show that the formation of indentation cracking has some relationship with the transformation stresses induced by martensitic transformation and surface compressive stresses, besides the residual stresses. Whereas the surface compressive stresses control the expansion of the surface cracks. Transformation toughening is the main reason for monolithic and laminated ZrO2 ceramics to increase strength and fracture toughness. The increasing of fracture toughness in ZrO2 laminated ceramics is realized mainly through the aspects such as the contribution of stress intensity factor under the surface compressive stresses, the increase of the fracture transformation amount and fining of the grains etc.

关 键 词：ZrO2层状复合陶瓷 表面压应力 相变增韧 断裂韧性 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]