表面修饰纳米二硫化钼粒子的研制及极压性能

Preparation of Modified Nano-molybdenum Bisulfide and Their Properties at Extreme-pressure Condition

以十八烷氧基二硫代磷酸吡啶盐(PyDDP)为表面修饰剂,钼酸钠、硫化钠、稀硫酸、盐酸羟胺为原料,合成了PyDDP修饰的MoS2纳米微粒。优化了还原过程、硫代过程和酸析出过程的工艺参数;采用IR,TG-DTA,XRD等分析方法,对表面修饰纳米微粒进行了表征,并分析了表面修饰纳米二硫化钼微粒的形成机理。研究结果表明,所制备的微粒是一种表面为有机物修饰、存在无机核的无机/有机纳米复合微粒。通过四球试验,研究了所制备微粒的摩擦学性能,并利用SEM,EDXA等方法对钢球表面的形貌、钢球表面元素进行了分析,探讨了所制备微粒对材料的摩擦学改善的机理。

Using pyridine dialkyldithiophasphate （PyDDP） as the surface modifying reagent, nano-molybdenum disulfide （MoS2） particles are synthesized with sodium molybdenum acid, sodium sulfide, sulfuric acid and hydroxylamine as raw materials. The technological parameters of the reduction process, the sulfur replacement and the separation process with acid are all optimized. Infrared spectrum （IR）, Thermal Gravity and Differential Thermal Analysis （TG-DTA）, X-Ray Diffraction （XRD） are employed to analyze the structure of nano-particles prepared. The mechanism of the surface modified nano-molybdenum disulfide is also investigated and results show that the particles are built from a layer of organic materials and a core of inorganic compound. The tribological properties of molybdenum bisulfide （MoS2） are evaluated with a four-ball test method, and the surface micrograph and the elements compositions are obtained with SEM（Scan Electron Micrograph） and EDXA（Elctron Diffraction X-ray Analysis）. It is shown that the modified process could provide the materials with better surface properties.