摘要
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 。
The sliding wear behavior of TiN composite coating with electric brush plating Ni W interlayer on 3Cr2W8V steel substrate has been investigated. The wear mechanisms of TiN/Ni W composite coating are analyzed based on observation of the worn coating surfaces with a scanning electron microscope. The results show that the mixed crystal Ni W brush plating interlayer crystallizes and precipitation strengthening occurs due to the temperature effects during the TiN deposition process. An interface diffusion layer is also formed between pallation. Moreover, the wear rates of the coatings initially increase with load increasing from 490 N to 980 N and then decreases as the load rises from 980 N to 1 470 N. This is mainly attributed to the change of the wear mechanisms of the coatings caused by a sharp load increase. Namely, the coatings are characterized by abrasive wear at relatively low load, while they are characterized by oxidation wear at extremely high load (above 1 470 N). Thelatter is usually accompanied by lower wear rate because of the friction reduction and wear resistant action of the resultant oxide film well bonded to the substrate.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2001年第4期246-250,共5页
Tribology
基金
湖北省自然科学基金项目资助 ( 2 0 0 0 J0 17)
华中科技大学模具技术国家重点实验室开放基金资助 ( 98-13)
湖北汽车工业学院科研基金项目资助 ( QY2 0 0 1-6 )
