轴承表面钨掺杂类金刚石薄膜性能研究

Study on Properties for W- Doped Diamond- Like Carbon Films on Bearing Surface

利用物理气相沉积技术在圆柱滚子轴承表面制备钨掺杂类金刚石(W-DLC)薄膜,通过试验考核了Cr4Mo4V高温轴承表面W-DLC薄膜的均匀性和断油条件下的减摩耐磨特性。结果表明:薄膜层间以及膜层与基体之间结合力不小于55 N;与未镀膜的基体表面相比,镀膜后表面的摩擦因数降低了70%,磨损量减少了约80%;经过30 min断油试验后镀膜轴承表面W-DLC薄膜仍保持完整,可继续使用,未镀膜轴承滚道表面出现烧蚀斑块、点状剥落,滚子表面出现较大的剥落坑与划痕等缺陷。

The W - doped diamond - like carbon （ W - DLC ） films is prepared by using physical vapor deposition tech- nique on surface of cylindrical roller bearings made of Cr4Mo4V. The uniformity of W - DLC film thickness and its anti -friction and wear properties under oil interruption condition are validated by test. The results show that the binding force between film layer and substrate and between film layers is no less than 55 N. Compared with uncoated surface, the friction coefficient of coated surface is reduced by 70%, and the wear loss is reduced by approximately 80% after coating. After 30 minutes oil cut interruption test, the bearings coated with W - DLC films remain intact and still func- tional. The raceway surface of uncoated bearings appears with ablative plaques and spot flaking, and the larger flaking pits and scratches are visible on roller surface.