【摘要】 利用等离子喷涂技术在TiAlZr钛合金基材上制备了WC-12Co涂层。XRD分析表明,等离子喷涂WC-12Co涂层主要以WC和W2C两相存在,并伴随少量的W,CoO和Co相。采用高精度高温液压式微动磨损试验机研究了涂层的微动磨损行为,用扫描电镜(SEM)、能谱仪(EDS)、激光共焦扫描显微镜(LCSM)对等离子喷涂WC-12Co涂层大气氛围中从室温(25℃)至400℃的滑移区微动磨损特性进行了研究,并与无涂层的TiAlZr钛合金基材进行了比较。结果表明:在室温(25℃)至400℃范围内,等离子喷涂WC-12Co涂层的摩擦因数随着温度的升高明显上升,而磨损体积基本不变;在此温度范围内,涂层的摩擦因数比基材低,磨损体积也比基材明显要低;等离子喷涂WC-12Co涂层提高了TiAlZr钛合金的抗高温微动磨损性能,其在室温(25℃)至400℃范围内的磨损机制主要以剥层形式为主,局部会有磨粒磨损。更多还原

【Abstract】 WC-12Co coating was prepared by plasma spraying on TiAlZr Titanium alloy substrate.Phase composition was analyzed by XRD.The structure of WC-12Co coating is mainly consisted of WC and W2C,accompanied by a little W,CoO and Co.Fretting wear tests in slip regime of WC-12Co coating were carried out on a high precision hydraulic fretting wear test rig.Fretting wear behaviours of WC-12Co coating from room temperature to 400 ℃ were studied by SEM,EDS and LCSM and compared with TiAlZr Titanium alloy.The results show that from room temperature to 400 ℃,the friction coefficient of coating increases with the increase of temperature and the wear volume is almost invariant.The friction coefficient of coating is lower than that of the substrate,and the wear volume is obvious lower than that of the substrate.WC-12Co coating by plasma spraying enhances the anti-fretting wear performance of substrate.Delamination wear is the major form of the damage mechanism of coating,accompanied by abrasive wear.更多还原