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采用粉末冶金技术制备了铜-石墨烧结材料,通过定速摩擦试验机,研究了石墨含量与第三体形态的关系及对材料摩擦性能的影响.结果表明:石墨含量小于15%时,石墨对材料的孔隙度及摩擦温度影响明显,表现出材料的摩擦磨损性能与石墨含量密切相关,这归因于干摩擦条件下摩擦表面形成的含有石墨粒子的第三体对摩擦性能作用明显.石墨含量低,形成的第三体金属成分高,硬质金属的犁沟作用导致摩擦系数和磨损率较高.随石墨含量增加,第三体中的石墨含量增加,这导致第三体致密程度和黏着程度降低,松散易流动的第三体有利于降低犁沟程度,从而起到降低和稳定摩擦系数、减少磨损率的作用.
The graphite-graphite sintering material was prepared by powder metallurgy technology, and the relationship between the graphite content and the morphology of the third phase and the tribological properties of the material were studied by a fixed-speed friction tester.The results show that when the graphite content is less than 15% The influence of porosity and friction temperature of the material is obvious, showing that the friction and wear properties of the material are closely related to the graphite content, which is attributed to the obvious effect of the third body containing graphite particles on the frictional properties formed on the friction surface under dry friction. Low, the formation of the third body of high metal composition, hard metal furrow effect leads to higher friction coefficient and wear rate.With the increase of graphite content, the third body of graphite content increases, which led to the third body of the degree of density and adhesion To a lesser extent, the loosely flowing third body is conducive to reducing the furrow extent, thereby reducing and stabilizing the friction coefficient and reducing the wear rate.