纳米二硫化钼粉体制备及其摩擦学性能

Preparation of MoS_2 Nanopowder and Its Tribological Properties

以钼酸铵和硫化铵为原料,通过化学沉淀法制备了纳米二硫化钼颗粒,利用透射电子显微镜（TEM）和X射线衍射（XRD）对粉体粒子形貌、大小和相结构进行了分析.利用立式万能摩擦磨损试验机测定了纳米二硫化钼的摩擦学性能,采用扫描电子显微镜（SEM）和能量色散谱仪（EDS）观察分析了磨损表面形貌及表面元素组成.结果表明：制备的纳米二硫化钼是粒径为40~50 nm左右的球形颗粒,具有大量的悬空键和很高的表面活性;作为固体润滑剂能明显降低摩擦系数,提高摩擦副的耐磨性能,易于在摩擦表面形成牢固的吸附膜和化学反应膜.

Molybdenum disulfide （MoS2） nanopowder particles as a solid lubricant were prepared by chemical precipitation with ammonium molybdate and ammonium sulfide as raw material and grain alcohol as surfactant. The morphology and phase structure of MoS2 nanoparticles were characterized by transmission electron microscope （TEM） and X-ray diffraction （XRD）, and its tribological properties were investigated on a vertical universal friction/wear tester. The worn surfaces of specimens were observed by scanning electron microscope （SEM） and the surface element composition was determined by means of energy dispersion spectrometry （EDS）. The results showed that the MoS2 nanoparticles are spherical-shaped with mean particle size about 40--50 nm, and lots of dangling bond and their high surface energy/activity can play the role as solid lubricant in reducing greatly the friction coefficient of a friction pair so as to improve the wearability. It was found that the lubricating mechanism is that the powdered MoS2 nanoparticles are easy to be firmly adsorbed on rubbing surface to form a MoSz thin film that will reacts chemically with metallic surface to become a wearable protecting film under high load at high temperature.