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研究了 3Cr2 W8V基体上电刷镀 Ni- W中间层和离子镀 Ti N复合涂层的滑动磨损特性 ,并分析了涂层的磨损机理 .结果表明 :由于 Ti N沉积过程中的温度效应 ,混合晶态的电刷镀 Ni- W层发生晶化和析出强化 ,并形成界面扩散层 ,从而使 Ti N复合涂层的结合力和硬度明显提高 ;Ni- W中间层对 Ti N涂层起到有力的支撑作用 ,Ti N/ Ni- W复合涂层的耐磨性优于 Ti N单层 ,且明显优于 3Cr2 W8V基体和 Ni- W涂层 ;涂层的主要磨损机制为磨粒磨损和疲劳剥落 ;当试验载荷从 490 N到 980 N时 ,涂层的磨损率上升 ,而当载荷从 980 N上升到 1470 N时 ,涂层的磨损率下降 .这是由于磨损机制发生变化所致 ,前者以磨粒磨损为主 ,后者则以氧化磨损为主
The sliding wear characteristics of Ni-W intermediate layer and ion-plated TiN composite coating on 3Cr2 W8V substrate were studied and the wear mechanism was analyzed. The results show that due to the temperature effect of TiN deposition, Crystallization of brush plating Ni-W layer crystallization and precipitation strengthening, and the formation of interfacial diffusion layer, so that TiN composite coating adhesion and hardness was significantly improved; Ni-W intermediate layer of Ti N coating play Ti N / Ni-W composite coating has better wear resistance than Ti N single layer, and is obviously superior to 3Cr2 W8V matrix and Ni-W coating. The main wear mechanism of the coating is abrasive wear and Fatigue spalling; the wear rate of the coating increases when the test load is from 490 N to 980 N, whereas the wear rate of the coating decreases as the load increases from 980 N to 1470 N. This is due to changes in the wear mechanism, The former is mainly abrasive wear, while the latter is mainly oxidative wear