等离子喷涂纳米FeS涂层的摩擦磨损性能研究

利用等离子喷涂技术在GCr15钢表面制备出纳米FeS固体润滑涂层,采用MHK-500型摩擦磨损试验机评价了FeS涂层在油润滑和干摩擦2种条件下的摩擦磨损性能,用扫描电子显微镜和X射线衍射仪观察分析了涂层的形貌、结构、物相组成和磨损表面形貌.结果表明,纳米FeS涂层的物相主要为六方FeS,还有少量Fe1-xS和氧化物,涂层由尺寸在50～100 nm的颗粒组成.与GCr15钢相比,纳米FeS涂层的减摩耐磨性明显提高,尤其在油润滑条件下摩擦系数降低1倍,在高载荷(375 N)条件下磨痕宽度降低近1倍.在油润滑和干摩擦条件下,FeS涂层的主要磨损失效形式均为塑性变形.

Tribological Properties of Nanostructured Iron Sulfide Coating Deposited by Plasma Spraying

Nanostructured iron sulfide coating was deposited by atmospheric plasma spraying. The friction and wear properties of the coating were investigated on an MHK-500 friction and wear tester under both oil lubrication and dry friction condition. The surface morphology, microstructure and worn surface morphologies of the coating were characterized with scanning electron microscopy. The phase composition of the coating was determined by X-ray diffraction. The coating was mainly composed of FeS, a small quantity of Fel1-xS and oxide. The coating was formed by small particles with size in the range of 50 - 100 nm. The plasma-sprayed nanostructured iron sulfide coating exhibited better tribological performance than GCr15 steel. Especially under oil lubrication, the friction coefficient of the nanostructured iron sulfide coating was half of that of GCr15 steel, the wear widths of the coating was also reduce to nearly half of that of GCr15 steel under high load. The failure of the coating was mainly due to plastic deformation under both oil lubrication and drv friction.