WC/C固体润滑涂层的滑动摩擦磨损性能研究

Friction and Wear Properties of WC/C Solid Lubricant Coating

在CETR UMT-2摩擦磨损试验机上用Si3N4陶瓷球和纯钛(TA2)球作为对磨副,对物理气相沉积(PVD)方法制备的WC/C固体润滑涂层进行了球-盘式的滑动摩擦磨损实验。利用光学显微镜(OM)、扫描电子显微镜(SEM)和电子能谱(EDX)对磨损表面进行了微观分析,探讨了WC/C涂层的摩擦磨损机理。结果表明:滑动速度对WC/C涂层的摩擦特性影响很大,较小的滑动速度有利于在两种对磨副的磨痕表面形成致密连续的转移膜。Si3N4球作为对磨副时,WC/C涂层的损伤主要表现为剥层及氧化磨损;纯钛球作为对磨副时,涂层损伤表现为轻微的磨粒磨损和氧化磨损,WC/C涂层拥有良好的抗钛粘着性能。

WC/C solid lubricant coating was prepared by Physical Vapor Deposition （PVD） technique. The friction and wear properties of the WC/C coating sliding against Si3N4 ceramic ball and titanium ball were investigated by using CETR UMT-2 micro-tribometer in a ball-on-disc configuration. The worn surfaces of the coating and counterparts were evaluated by Optical Microscope （OM）, Scanning Electron Microscopy （SEM） and Energy Dispersive X-ray spectroscopy （EDX）, and the wear mechanism of the coating was discussed consequently. The results showed that the sliding velocity had great influence on the friction properties of the WC/C coating, and a relatively lower sliding velocity was of benefit to forming dense and continuous transferred films on the two counterparts. The wear damage of the WC/C coating was characterized by a combination of delamination and oxidative wear when sliding against Si3N4 ball, and by a combination of ultra-mild abrasive and oxidative wear when sliding against titanium ball. The WC/C coating exhibited good anti-adhesion properties against titanium.