热挤压态Al-Si-Pb轴承合金的摩擦学行为  

Tribological Behavior of Hot-extruded Al-Si-Pb Bearing Alloys

作　　者：王军[1] 安健[1] 杨晓红[1] 刘勇兵[1] 许德蔚[1] 

机构地区：[1]吉林大学材料科学与工程学院,吉林长春130025

出　　处：《摩擦学学报》2002年第4期268-272,共5页Tribology

基　　金：国家教委博士点基金资助项目 (19990 185 13 )

摘　　要：研究了热挤压对搅拌铸造 Al- Si- Pb合金组织与机械性能的影响 .结果表明 :热挤压可以显著改善合金铸态组织 ,降低气孔率 ,提高机械性能 ;随着铅含量增加 ,合金的摩擦系数与磨损率显著下降 ,尤其铅含量为 2 0 %与 2 5 %的合金抗咬合性能明显提高 .对其磨损表面的光学与 X射线光电子能谱分析表明 ,磨损表面了形成由 Al2 O3、Fe2 O3和 Pb的化合物组成的混合物润滑膜 ,这是其抗咬合性能得以改善的直接原因 .To improve the mechanical properties, especially the friction and wear characteristics of as-cast Al-Pb alloys, an attempt was made to study the friction and wear behavior of hot extruded Al-Pb alloys under dry sliding conditions. It was found that hot extrusion considerably improved the mechanical properties of as-cast Al-Pb alloys and greatly decreased the porosity that was caused by powerful stirring. The friction coefficient and the wear rate were decreased with the increase of lead content, especially the anti-seizure property of Al-Pb alloys containing 20 wt.% lead or 25 wt.% lead was improved remarkably. The optical and XPS analyses of the worn surface reveal that the reason is attributed to the formation of a black compact film of lubricant on almost the entire worn surface of specimens at high applied load. This film could be is a mixture of composed Al2O3, Fe2O3 and a compound containing Pb.

关 键 词：摩擦学行为 铝铅轴承合金 热挤压 磨损率 抗咬合性 

分 类 号：TG146.21[一般工业技术—材料科学与工程]