铜-石墨材料摩擦学行为的研究  

Tribological Behavior of Copper-graphite Friction Materials

作　　者：符蓉[1] 高飞[1] 宋宝韫[1] 王延辉[1] 

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《摩擦学学报》2010年第5期479-484,共6页Tribology

基　　金：国家863计划项目(2006AA03Z515);国家自然科学基金项目(50375025)的资助

摘　　要：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.Copper - graphite sintered materials were prepared by powder metallurgy technology. The relationship of the graphite content to the third body topography and the impact of the graphite content on frictional properties of the materials were investigated on a constant speed friction test machine. The results showed that, when less than 15%, the graphite had a significant influence to the material porosity and the friction temperature. The results demonstrated clearly the friction and wear property of the material was closely related to the graphite content and this was due to the effect of the third body containing graphite particles formed on the frictional surface under dry friction condition. The third body derived from low graphite content sintered materials had a high level of metal composition. Plowing effect of the hard metal led to higher friction coefficient and wear rate. With the increase of graphite content, the density and adhesion of the third body reduced because of the increase level of graphite in the third body. The low compactness and easy flow of the third body alleviated the surface plowing, lowered and stabilized the friction coefficient and, therefore, reduced wear rate.

关 键 词：复合材料 摩擦磨损 铜-石墨烧结材料 第三体 

分 类 号：TF125[冶金工程—粉末冶金] TH117.3[冶金工程—冶金物理化学]