Ni60A／MoS2复合涂层润滑膜的形成及自修复机理

Formation and Self-Repairing Action of Ni60A/MoS_2 Composite Lubricating Film

通过考察等离子体喷涂Ni60A/MoS2复合润滑涂层的摩擦学特性,探讨了复合涂层中MoS2润滑膜的形成及自修复作用,讨论了影响MoS2润滑膜形成过程及其润滑和减摩抗磨性能的因素,进而建立了用于说明润滑膜形成及破坏过程的物理模型。结果表明:润滑涂层润滑膜的形成机理包括摩擦开始、MoS2析出表面、MoS2覆盖表面和MoS2表面膜形成等4个阶段.润滑涂层润滑膜的破损过程包括膜的厚度不断减小、裂纹的产生、裂纹的扩展和润滑膜的剥落4个阶段.同时,硬质颗粒刺入润滑膜并导致润滑膜擦伤,从而大幅降低润滑膜的寿命,其降幅接近一半.

Based on the study of the tribological properties of plasma sprayed Ni60A/MoS2 composite coating, the formation and self-repairing mechanism of MoS2 lubricating film were inves- tigated, and the factors influencing MoS2 lubricant film formation process and its lubrication and anti-wear properties were discussed. A physical model for describing the process of the lubricating film formation and destruction was proposed. Results show that the formation of the MoS2 lubricating film can be classified into four stages, including the initial friction stage, an- choring stage of MoS2 on sliding surface, covering stage of the sliding surface by MoS2, and the formation stage of MoS2 film. The destruction process of the composite lubricating film includes decreasing of film thickness, emerging of crack, propagation of crack, and detachment of the lubricating film. The hard particles are able to micro-cut the lubricating film, resulting in scratch and abrasion destruction of the lubricating film and hence its lifespan was cut in about half.