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Tribological Behaviour and Mechanism of Zirconia Toughened Mullite Composite Ceramic at Elevated Temperatures

TAN Ye-fa1,ZHOU Zhao-xia1,4,YU Ai-bing2,CAI Wen-li3,TAN Hua1,WANG Xiao-long1 (1.Department of Mechanical Engineering,PLA University of Science and Technology,Nanjing 210007,Jiangsu,China;2.Faculty of Engineering,Ningbo University,Ningbo 315211,Zhejiang,China;3.Design Institute of Engineering Science and Research,Guangzhou 510515,Guangdong,China;4.Commanding Institute of Engineer Corps,Xuzhou 221004,Jiangsu,China)  
In order to apply engineering ceramics to friction parts at high temperature conditions,the tribological behaviour and mechanism of zirconia toughened mullite composite ceramic(ZTM) worn against Y2O3 stabilized zirconia(TZP) ceramic were investigated.The results show that the wear rate of ZTM decrease with the increase of temperature;"negative wear" phenomenon results from the formation of a transferred layer on the worn surface of ZTM,at the condition of that the temperature is higher than 400?℃,the wear rate of TZP increase with the increase of temperature and a severe wear emerges when temperature is higher than 400?℃.The essence of the transferred layer is the surface diffusion of Zr atoms from TZP to ZTM surface.The wear mechanism of ZTM gradually changes from micro-cracking at 25?℃ to adhesive wear at elevated temperatures.The wear mechanism of TZP varies from micro-cutting accompanied by plastic deformation at 25?℃ to brittle fracture with the elevation of temperature.
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