Al2O3基陶瓷材料与硬质合金摩擦的应力分析

利用ANSYS有限元分析软件对5种Al2O3基陶瓷材料（纯Al2O3、Al2O3／TiC、Al2O3／（W，Ti）C、Al2O3／Ti（C，N）和Al2O3／SiCw）在MRH-3环块磨损试验机上与硬质合金摩擦进行模拟仿真，得到摩擦磨损过程中的应力及分布，并与室温下的磨损实验结果相比较，同时还探讨了不同添加剂的Al2O3基陶瓷的磨损机理．结果表明：不同成分的Al2O3基陶瓷材料在摩擦磨损过程中最大主应力位于摩擦副接触区中心，最大剪应力位于摩擦副接触区边缘；载荷对主应力和剪应力大小的影响比转速的影响大；在相同的摩擦条件下，受到合应力越大的陶瓷其磨损率越大；合应力越大的陶瓷磨损后陶瓷表面越容易产生微裂纹．5种Al2O3基陶瓷磨损率的大小为：Al2O3〉Al2O3／（W，Ti）C〉Al2O3／Ti（C，N）〉Al2O3／TiC〉Al2O3／SiCw．

Stress Analysis of New Al203-Based Ceramic Materials Against Cemented Carbide During Wear Process

The process of dry friction and wear test of Al2O3-based ceramic against cemented carbide （YGS） at room temperature with a MRH-3 high-speed ring-block tribometer was simulated by using ANSYS software. The research materials were Al2O3, Al2O3/TiC, Al2O3/（W, Ti）C, AIEO3/Ti（C, N） and Al2O3/SiCw. The stress distribution of Al2O3-based ceramic materials against YG8 during wear processes was obtained, and was compared with the experiment results at room temperature. The wear mechanism of ceramics with different additives was discussed. Test results show that the maximum of main stress is located at the center of sliding couple, while the maximum of shear stress at the outside of sliding couple. The value of the stress increases with the increase of applied load, and the sliding speed just has little effect on the stresses. Under the same working condition, if the stress during wear process is large enough, micro - crack will appear on the surface of ceramic. The collating sequence of wear rate of these five ceramic materials is Al2O3 〉 Al2O3/（W, Ti）C 〉 Al2O3/Ti（C, N） 〉 Al2O3/TiC 〉Al2O3/SiCw.