与45钢对摩材料干摩擦条件下的摩擦学性能

Tribological Properties of Friction Material with 45 Steel Under Dry Friction Condition

为选择与45钢对摩的摩擦副材料以适应干摩擦苛刻工况,采用RTEC多功能摩擦试验机,对超高分子量聚乙烯(UHMWPE)、改性聚醚醚酮树脂(改性PEEK)、浸渍呋喃树脂碳石墨(M120K)和浸渍巴氏合金碳石墨(M120B)4种配副材料的摩擦学性能进行测试,并利用扫描电子显微镜对磨损表面进行观察和分析,从微观角度揭示了4种材料的摩擦磨损机理。结果表明,随着载荷和转速的增加,平均摩擦系数大致呈现出M120B<UHMWPE<改性PEEK<M120K的规律,磨损率则大致呈现出M120B<改性PEEK<M120K<UHMWPE的规律。当载荷增大时,UHMWPE和M120K由磨粒磨损逐渐转变为粘着磨损;改性PEEK以粘着磨损为主并伴随轻微的磨粒磨损;M120B表现出磨粒磨损与粘着磨损共存的形式。当转速增大时,UHMWPE和M120B以磨粒磨损为主并伴随轻微的粘着磨损;改性PEEK和M120K以粘着磨损为主并伴随轻微的磨粒磨损。

In order to select the material of the friction pair for rubbing against 45 steel to adapt to the harsh working conditions of dry friction,the RTEC multifunctional friction testing machine was used to test the tribologi-cal properties of ultra-high molecular weight polyethylene(UHMWPE),modified polyether ether ketone resin(mod-ified PEEK),the impregnated furan resin carbon graphite(M120K)and the impregnated Babbitt alloy carbon graph-ite(M120B),and the wearing surface was observed and analyzed by scanning electron microscope(SEM).The fric-tion and wear mechanisms of these four materials were revealed.The results show that with the increase of load and speed,the average friction coefficient roughly presents the law of M120B<UHMWPE<modified PEEK<M120K,and the wear rate roughly presents the law of M120B<modified PEEK<M120K<UHMWPE.When the load increases,UHMWPE and M120K gradually change from abrasive wear to adhesive wear;modified PEEK is dominated by adhesive wear accompanied by slight abrasive wear;when the speed increases,UHMWPE and M120B are mainly abrasive wear accompanied by slight adhesive wear;modified PEEK and M120K are dominat-ed by adhesive wear accompanied by a certain degree of abrasive wear.