Y-TZP/Al_2O_3纳米复合陶瓷的压痕尺寸效应  

Indentation Size Effect of Y-TZP/Al_2O_3 Nano Composite Ceramics

作　　者：张永胜[1] 胡丽天[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000

出　　处：《机械工程材料》2011年第4期95-97,100,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50902132);中国科学院"西部之光"人才培养计划资助项目(2010)

摘　　要：通过控制初始粉体的晶粒尺寸和成型素坯的烧结条件，制备出了晶粒尺寸在100～500rim范围的Y—TZP／Al2O3纳米陶瓷复合材料；采用扫描电镜、X射线衍射仪分析了其显微结构和物相组成，并用压痕法测定了显微硬度。结果表明：该复合陶瓷主要由t-ZrO2相组成，同时含有少量α—Al2O3其显微硬度存在显著的压痕尺寸效应，且硬度与晶粒尺寸的平方根成反比。By controlling the initial grain size of powders and sintering conditions of the green body,Y-TZP/Al2O3 nano composite ceramics with grain size of 100- 500 nm were prepared. The microstructure and phase composition were analyzed by means of scanning electron microscopy and X-ray diffraction. Using indentation method the micro-hardness of the ceramics with different grain sizes was evaluated. The results show that the ceramics were composed of t-ZrO2 with little α-Al2O3 phase. The micro-hardness of the ceramics had obvious indentation size effect, and the hardness was inversely proportional to the square root of grain size.

关 键 词：Y-TZP/Al2O3复合陶瓷 纳米陶瓷 压痕尺寸效应 

分 类 号：TQ174.75[化学工程—陶瓷工业]