含氢 WC/ C 复合涂层在不同润滑油环境的摩擦性能

利用非平衡磁控溅射技术,通过同时离化乙炔气体和共溅射石墨靶与碳化钨靶,在304不锈钢和单晶硅基底上沉积具有Cr过渡层和WC过渡层的含氢WC/C复合涂层。采用扫描电镜、Raman光谱仪、X射线衍射仪、纳米压痕仪等对涂层的微观结构、力学性能进行分析。利用Rtec摩擦磨损试验机对WC/C复合涂层与304不锈钢基底在PAO基础润滑油环境、发动机润滑油环境以及腐蚀性发动机润滑油环境进行摩擦性能测试。结果表明:涂层内含有较多类石墨sp2键,WC1-x相镶嵌在非晶碳基质中构成多相复合结构;涂层的硬度和弹性模量明显高于304不锈钢基底,且其H/E值远高于基底;与304不锈钢基底相比,在三种润滑油环境下涂层均具有较低的摩擦因数和磨损率。

Tribological Properties of Hydrogenated WC/ C Multilayer Coating UnderDifferent Lubricating Oil Conditions

Hydrogenated WC/ C multilayer coating was deposited by unbalanced sputtering technology. It was

produced by isolating the acetylene gas, sputtering the graphite target and tungsten carbide target at the same time. A

Cr translation layer and a WC translation layer were arranged for the coating on 304 stainless steel or silicon wafers.

The microstructure and mechanical properties of coatings were analyzed by scanning electron microscope(SEM), Ra-

man spectrometer, X-ray diffractometer (XRD) and nanoidenter. Rtec friction tester was used to investigate the tribo-

logical properties of coating under PAO base oil, engine oil and corrosive engine oil. The results indicate that plentiful

graphite-like sp 2 bonds were formed in the coating. It has the multiphase composite structure in which WC 1-x phase is

embedded in the amorphous carbon. Compared with 304 stainless steel, WC/ C coating has higher hardness, elastic

modulus and the value of H/ E significantly. Besides, the coating exhibits lower friction coefficients and wear rates

than base materials under three kinds of lubricating oil conditions.