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为提高45Cr Ni Mo VA钢表面的耐磨性能,采用HEP Jet超音速等离子喷涂系统在其表面制备了Mo涂层,通过场发射型超高分辨率扫描电镜(Field Emission Scanning Electron Microscopy,FESEM)、X射线能量谱仪(Energy Dispersive Spectrometer,EDS)、电子扫描电镜(Scanning Electron Microscopy,SEM)及高精度三维形貌仪对比分析了涂层与基体的摩擦磨损性能及磨损机理,并对涂层磨损率的影响因素进行了研究。结果表明:轻载荷(试验载荷为5 N)、低频率(滑动频率为5 Hz)下,涂层的磨损率略低于基体,其磨损机理为粘着磨损和氧化磨损,而基体为粘着磨损、氧化磨损和轻微的磨粒磨损;重载荷(试验载荷为20 N)、高频率(滑动载荷为20 Hz)下,涂层的磨损率约为基体的50%,磨损机理同样为粘着磨损和氧化磨损,基体则表现为严重的磨粒磨损和氧化磨损;涂层磨损率随载荷的增加呈先上升后下降的趋势;涂层磨损率随滑动频率增大而上升,但上升速度不一,这与摩擦生热量对氧化膜生成速度影响程度密切相关;涂层磨损率随时间延长而稳定上升。
In order to improve the wear resistance of 45Cr Ni Mo VA steel, a Mo coating was prepared on the surface of the 45Cr Ni Mo VA steel by HES Jet plasma spraying system. The surface of the coating was characterized by field emission high-resolution scanning electron microscopy (FESEM) X-ray energy dispersive spectrometer (EDS), scanning electron microscopy (SEM) and high-precision three-dimensional topograph were used to analyze the friction and wear properties and the wear mechanism of the coating and the substrate. The rate of influence factors were studied. The results show that the wear rate of the coating is slightly lower than that of the matrix under light load (5 N test load) and low frequency (5 Hz sliding frequency). The wear mechanism of the coating is adhesive wear and oxidation wear, while the matrix is adhesive wear, Oxidation wear and slight abrasive wear; the wear rate of the coating is about 50% of that of the matrix under high load (test load of 20 N) and high frequency (sliding load of 20 Hz) Wear, the matrix showed serious abrasive wear and oxidation wear; coating wear rate increased with the load was first increased and then decreased; coating wear rate increased with the slip frequency increases, but the rate of rise, which It is closely related to the influence of frictional heat on the formation rate of oxide film. The wear rate of coating increases steadily with time.