层数对梯度自润滑陶瓷刀具材料Al_2O_3/TiC/CaF_2残余应力的影响

Effects of Layer Number on the Residual Stress of Gradient Self-lubricating Ceramic Tool Materials Al_2O_3/TiC/CaF_2

针对陶瓷减摩性能与耐磨性能不能在自润滑刀具中合理兼顾的难题,本研究将梯度功能材料设计思想引入Al2O3/TiC/CaF2自润滑陶瓷刀具材料的设计和制造中,并建立了该梯度自润滑陶瓷刀具材料的物理模型、组成分布模型和物性参数模型。采用有限元方法计算分析了层数对对称型梯度自润滑陶瓷刀具残余应力的影响,确定了最佳层数为7层。以本设计模型和有限元分析结果为基础,制备了分布指数为1.8的7层梯度自润滑陶瓷刀具材料Al2O3/TiC/CaF2。试验结果表明:所制备的梯度自润滑陶瓷刀具材料具有良好的力学性能。

Aiming at the problem that the wear resistance and antifriction property of serf-lubricating ceramic tools can＇t be reasonably concerned simultaneously, the idea of functionally gradient material （FGM） was used to design self-lubricating ceramic tools. The physical model, composition distribution model and physical parameter model of Al2O3/TiC/CaF2 gradient self-lubricating ceramic tool were fabricated. The effects of layer number on the residual stresses of symmetrically distributed gradient self- lubricating ceramic tools were analyzed with the finite element method. The optimum layer number is determined as 7. Based on the design models and finite element method, a gradient self-lubricating ceramic tool material Al2O3/TiC/CaF2 with the distribution exponent of 1.8 and layer number of 7 was fabricated, which had good mechanical properties.