纳米-亚微米MoS_2涂层的结构和摩擦性能

Microstructure and tribological properties of nano-and submicron-structured MoS_2 coating deposited by plasma spraying

利用等离子喷涂技术在GCr15钢表面制备了纳米-亚微米MoS2固体润滑涂层.采用MHK-500型摩擦磨损试验机在油润滑条件下测试了MoS2涂层的摩擦学性能.利用扫描电子显微镜和X射线衍射仪观察分析了涂层的表面和断面的磨损形貌以及涂层的物相组成.结果表明,纳米-亚微米MoS2涂层的物相主要为六方的MoS2,还有少量的Mo,Mo2S3和MoO3.涂层的晶粒尺寸在100～400 nm.与GCr15钢原始表面相比,纳米-亚微米MoS2涂层的减摩耐磨性有了明显的提高,摩擦系数降低近1倍,在载荷为375 N的条件下,磨损量也降低近1倍.

Nano- and submicron-structured MoS2 coating was deposited by atmospheric plasma spraying. The friction and wear properties of the coating were investigated with an MHK-500 friction and wear tester under oil lubrication. The microstructure, phase composition and worn surface morphologies of the coating were analyzed with SEM and XRD. It was found that the coating is mainly composed of MoS2, and a small quantity of Mo, Mo2S3 and MoO3 are also found. The grain size of the coating is 100-400 nm. The tribological properties of the plasma-sprayed nano- and submicron MoS2 coating are more superior to that of the GCr15 steel. The friction coefficient of the nano- and submicron-structured MoS2 coating is half of that of GCr15 steel. The worn volume of the coating was also reduced to nearly half of that of GCr15 steel under high load.