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采用阴极离子镀方法在YT14硬质合金刀具表面制备了Ti N涂层,用高温摩擦磨损试验机考察Ti N涂层在500℃高温下摩擦-磨损行为。通过扫描电镜观察涂层表面-界面形貌和高温磨损后表面形貌,用XRD分析了Ti N涂层物相变化,并用EDS能谱仪对结合界面进行线扫描分析和磨痕进行面扫描分析,同时用工具显微镜观察了表面犁沟形貌,对Ti N涂层500℃下磨损机理进行探讨。结果表明,Ti N涂层在500℃磨损后发生高温氧化,Ti N涂层表面磨痕处主要以Ti O2为主,这些氧化层起到了润滑减摩的作用,适合于高速切削与干式切削;在5 N载荷作用下,Ti N涂层的摩擦系数平均值为0.7116;在高温下Ti N涂层表现为氧化磨损,同时伴随着一定的磨粒磨损和黏着磨损。
The TiN coating was prepared on the surface of YT14 carbide cutting tool by cathodic ion plating. The friction and wear behavior of TiN coating at 500 ℃ was investigated by high temperature friction and wear testing machine. The surface morphology of the coating and the morphology of the surface after high temperature abrasion were observed by scanning electron microscopy. The phase transformation of TiN coating was analyzed by XRD. The scanning electron microscopy (SEM) and scanning electron microscope At the same time, the surface furrow morphology was observed with a tool microscope, and the wear mechanism of TiN coating at 500 ℃ was discussed. The results show that the TiN coating is oxidized by high temperature after it is worn at 500 ℃. TiO coating is mainly TiO2 on the surface of the TiN coating. These oxides play the role of lubrication and friction reduction. It is suitable for high speed cutting and dry cutting The average friction coefficient of TiN coating is 0.7116 under the load of 5 N. The TiN coating shows oxidative wear at high temperature accompanied by some abrasive wear and adhesive wear.