铬对铜基粉末冶金材料摩擦磨损性能的影响  

Effects of Cr Content on Friction and Wear Properties of Copper Matrix Frictional Materials

作　　者：符蓉[1] 房顺利[1] 高飞[1] 韩晓明[1] 

机构地区：[1]大连交通大学连续挤压教育部工程研究中心辽宁大连116028

出　　处：《润滑与密封》2013年第10期15-20,共6页Lubrication Engineering

基　　金：国家973计划项目(2011CB612205);国家自然科学基金项目(51241003)

摘　　要：采用粉末冶金工艺制备铜铬基粉末冶金摩擦材料，在制动压力0．5～0．76MPa、制动速度1000—3000r／min范围内，探讨干、湿2种状态下铬对材料摩擦磨损性能的影响。结果表明，随铬含量增加，材料的摩擦因数和磨损量降低，且随制动压力增加，摩擦因数降低；在低摩擦速度时，湿摩擦因数低于干摩擦，高速时则相反。铬降低了材料的摩擦因数和磨损量的原因在于铬增加了材料的硬度而起到了降低摩擦面的损伤程度和表面粗糙度的作用。在较低的摩擦速度条件下，由于水分的润滑作用充分，导致摩擦因数降低，在高速摩擦条件下，水分冷却作用明显，导致表面微凸体间的啮合强度增加而使摩擦因数高于干摩擦。Copper-chromium based powder metallurgy friction materials were prepared through powder metallurgy. The effects of Cr contents on the friction and wear properties were explored under dry and wet conditions, with brake pressure range of 0. 5 - 0. 76 MPa and brake speed range of 1 000 - 3 000 r/min. The results show that the friction coefficient and wear of the materials are reduced with increasing chromium content, and the friction coefficient is reduced with the increase of the brake pressure;the wet friction coefficient is higher than dry friction coefficient at low speed, and lower at high speed. Chromium can reduce the friction coefficient and wear of the materials due to chromium increases the hardness of the material and plays a role to reduce the damnification and roughness of the friction surface. The wet friction coefficient is decreased at low friction speed, due to the lubricating function of water film, when at high friction speed, the cooling function of the water is obvious, resulting in the increase of engaging strength between the surface asperities, so that the friction coefficient is higher than that of dry friction.

关 键 词：铜基摩擦材料 铬 摩擦磨损 粉末冶金 

分 类 号：TH117.1[机械工程—机械设计及理论]