MoS_(2)−Ag−V_(2)O_(5)对镍基材料摩擦磨损性能的影响

Effect of MoS_(2)−Ag−V_(2)O_(5)on friction and wear properties of nickel-based composites

采用粉末冶金烧结工艺制备了含不同润滑剂(MoS_(2)、Ag和V_(2)O_(5))的镍基自润滑复合材料,研究了镍基复合材料在室温至600℃之间的摩擦磨损性能,通过X射线衍射仪、扫描电子显微镜和Raman光谱等分析相组成和磨损形貌。结果表明:镍基自润滑复合材料的摩擦系数随温度的增加呈先增加后降低的趋势。在室温条件下,随着Ag含量的增加,复合材料的摩擦系数减小;在600℃,随着V_(2)O_(5)含量的增加,复合材料的摩擦系数和磨损率均降低。在中低温,镍基自润滑复合材料主要由MoS_(2)和Ag起润滑作用,降低材料摩擦磨损;在高温,复合材料发生了摩擦化学反应,生成新的钼酸银润滑相,润滑机理是由钼酸银和V_(2)O_(5)的协同润滑效应。

The nickel-based self-lubricating composites added with the different solid lubrications(MoS_(2),Ag,and V_(2)O_(5))were prepared by powder metallurgy sintering.The friction and wear properties of the nickel-based composites were investigated between room temperature and 600℃.The phase composition and the wear surface micromorphology were analyzed by X-ray diffraction(XRD),scanning electron microscope(SEM),and Raman spectroscopy.The results indicate that,the friction coefficients of the nickelbased self-lubricating composites increase firstly and then decrease with the temperature increasing.At room temperature,the friction coefficients of the composites decrease with the increase of Ag content;at 600℃,the friction coefficients and wear rates of the composites decrease with the increase of V_(2)O_(5)content.The composites mainly reduce the friction and wear by MoS_(2)and Ag at medium and low temperatures;a new lubricating phase of silver molybdates is formed in the friction chemical reaction of the composites at the high temperature,and the lubrication mechanism is the synergistic lubrication effect of silver molybdate and V_(2)O_(5)at high temperature.