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以不同含量的MoS2、CaF2为润滑相,加入Cu、Fe和合金等元素,采用粉末冶金烧结工艺制备了具有在室温和高温下均有自润滑作用的铁镍基复合材料。采用UMT-2摩擦磨损试验仪、扫描电镜以及X射线衍射测试并分析了复合材料的摩擦磨损性能以及机理。结果表明,随着MoS2含量的减少、CaF2含量的增加,在室温时摩擦系数、磨损率均增大;而高温时摩擦系数、磨损率先降低后增大。当MoS2、CaF2各含3%(质量百分数)时复合材料在室温和高温时拥有最佳的摩擦性能。该复合材料室温时主要是MoS2起润滑作用,降低材料的摩擦磨损;而高温时MoS2、CaF2与金属相互作用生成CrxSx+1以及MoO2、CaMoO4、Fe2O3、FeMo4F6等物质,这些物质在摩擦表面形成复合润滑膜而起润滑作用。
With different content of MoS2, CaF2 as lubricating phase, adding Cu, Fe and alloy elements, using powder metallurgy sintering process has prepared at room temperature and high temperature have self-lubricating iron-nickel matrix composites. The friction and wear properties and mechanism of the composites were analyzed by UMT-2 friction and wear tester, SEM and X-ray diffraction. The results show that with the decrease of MoS2 content and the increase of CaF2 content, the friction coefficient and wear rate increase at room temperature, while the friction coefficient and wear rate decrease first and then increase at high temperature. When MoS2 and CaF2 each contain 3% (mass%), the composites have the best tribological properties at room temperature and high temperature. MoS2 and CaF2 interact with metal to form CrxSx + 1 and MoO2, CaMoO4, Fe2O3, FeMo4F6 and other substances at room temperature, which form a complex on the friction surface Lubricate the membrane and play a role in lubrication.