AT13/WS_(2)复合涂层的制备及摩擦学性能

Preparation and Tribological Properties of AT13/WS_(2) Composite Coating

采用等离子喷涂技术和水热反应合成法制备Al_(2)O_(3)–13%TiO_(2)(AT13)陶瓷涂层和AT13/WS_(2)复合涂层,利用多功能摩擦学试验机和原子力显微镜,研究原位合成的WS_(2)对AT13陶瓷涂层表面摩擦磨损性能的影响,且利用场发射扫描电子显微镜(FESEM)、能谱仪(EDS)和X射线衍射仪(XRD)对AT13/WS_(2)复合涂层物相组成和微观形貌进行分析,探讨材料的磨损机理。结果表明:通过水热反应,可将WS_(2)粉末合成在AT13涂层表面微裂纹和孔隙中,制得AT13/WS_(2)复合涂层;在干摩擦测试条件下复合涂层的摩擦系数(0.2左右)相对AT13涂层(0.7左右)显著降低;在微观尺度下AT13涂层横向摩擦力(0.5 V)明显大于AT13/WS_(2)复合涂层(0.1 V);严重的磨粒磨损和脆性剥落是AT13涂层磨损的主要原因,WS_(2)的引入可改善AT13涂层的磨损情况,AT13/WS_(2)复合涂层展现出优异的自润滑性能。

Al_(2)O_(3)–13%TiO_(2)(AT13)ceramic coating and AT13/WS_(2) composite coating were prepared by plasma spraying technology and hydrothermal reaction synthesis method,the effect of in-situ synthesized WS_(2) on the tribological properties of AT13 was studied by multi-functional tribology testing machine(MTTM)and atomic force microscopy(AFM).AT13/WS_(2) composite coating phase composition and micro morphology were analyzed by using field emission scanning electron microscopy(FESEM),energy dispersive spectroscopy(EDS)and X ray diffractometry(XRD)to explore the wear mechanism of the material.The results show that AT13/WS_(2) composite coating can be prepared successfully by hydrothermal reaction,which can synthesize WS_(2) powder in microcracks and pores of AT13 surface.Under the dry friction test conditions,the friction coefficient of the composite coating(~0.2)is significantly lower than that of the AT13 coating(~0.7).Moreover,at the microscopic scale,the transverse friction of AT13/WS_(2) composite coating(0.1 V)is also surpassed than that of AT13 coating(0.5 V).Severe abrasive wear and brittle spalling are the main cause of the wear of AT13 coating,and the introduction of WS_(2) can improve the wear of AT13 coating,and AT13/WS_(2) composite coatings exhibit excellent self-lubricating performance.