电场对WC―Co／Ti6A14V摩擦磨损性能的影响

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In order to study friction and wear performance of an electric field, the friction and wear experiments of WC-Co/Ti6AI4V were carried out on high speed friction and wear testing device designed by the authors. Three-dimensional profilometer was used to observe the worn surface morphology of Ti6A14V and to measure the surface roughness. Scanning electron-microscope（SEM） and energy dispersive X-ray spectroscopy（EDS） were used to examine the worn surfaces of WC-Co. Experimental results show that open circuit can reduce the influence of thermocurrent on the friction and wear of WC-Co/Ti6A14V,and the effects of strong electric field produced by static cooling technology are more significant. While restrain the wear of friction pair, it can improve the worn surface quality of Ti6A14V. SEM observation and EDS analysis indicate that under static cooling condition Rehbinder effect decreases the adhesion ability of titanium alloy thus to reduce adhesion wear of WC-Co. In highspeed sliding the main wear mechanism of WC-Co is adhesion wear and oxide wear,accompanying with microcracks.为了研究电场对摩擦副摩擦磨损性能的影响，在自行设计的高速摩擦磨损试验装置上，进行了WC―Co／Ti6A14V摩擦副的摩擦磨损试验。结果表明：断开摩擦副热电回路可以有效地减小热电流对WC―Co／Ti6A14V摩擦副摩擦磨损的影响，静电冷却环境下形成的强电场的效果更加明显，在抑制摩擦副磨损的同时还可以改善Ti6A14V磨损表面质量。通过扫描电镜及EDS能谱分析可知，静电冷却条件下的列宾捷尔效应削弱了钛合金的黏着能力，从而有效地减小了WC―Co的黏着磨损；WC―Co在高速摩擦时主要以黏着磨损、氧化磨损为主，同时伴有微裂纹的产生。