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氧化锆基梯度功能材料的设计、制备与性能优化
作者:方媛1 苏云峰1 2 张永胜1 胡丽天1 
单位: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 2. 中国科学院大学 北京 100049 
关键词:氧化锆 石墨 功能梯度材料 力学性能 热膨胀 
分类号:TQ174
出版年,卷(期):页码:2016,44(12):1729-1735
DOI:10.14062/j.issn.0454-5648.2016.12.09
摘要:

 以石墨为单相润滑剂,设计、制备了梯度层热膨胀系数呈连续变化的氧化锆基功能梯度材料,研究了结构参数与梯度材料力学性能的关系。结果表明:通过调节石墨在复合材料中的空间分布特征,可实现对材料内残余应力大小的调节,进而实现材料力学性能的优化。增大梯度层数和承载层厚度均有利于梯度材料力学性能的提高。梯度指数p为2.5时,材料具有最佳的抗弯强度,抗弯强度可达750 MPa。材料的梯度结构设计实现了陶瓷复合材料的结构/润滑功能一体化。

 

Zirconia-based functionally graded materials with different thermal expansion coefficients (FGMs) were designed and prepared using graphite as a lubricant. The relation between the structure parameter of the prepared materials and their properties was investigated. The results indicate that the residual thermal stresses in the FGMs can be adjusted by changing the distribution of graphite in order to improve the mechanical properties. Increasing the number of graded layers and thickness of bearing layer of zirconia can favor the improvement of the mechanical properties. The bending strength is 750 MPa. The zirconia-based FGM has a maximum bending strength when the gradient index, p, is 2.5. This design realizes the integration of structure and lubricating function of the ceramic composites, which provides a basis for applications of ceramic materials in tribo-engineering.

 
基金项目:
中国科学院科技创新基金(CXJJ-15M059);中国科学院“青年创新促进会”人才专项(2013272)
作者简介:
方 媛(1988—),女,博士。
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