高铝铜合金激光熔敷层高载荷干摩擦下的摩擦磨损特性

采用激光熔覆技术在45#钢基体上制备高铝铜合金涂层,对涂层进行较高载荷下的干摩擦磨损实验研究,测定不同载荷下涂层的摩擦系数,观察涂层的磨损形貌,测量涂层不同载荷下的磨损失重量,探讨涂层的磨损机理。结果表明:随外加载荷的增加,激光熔覆层的摩擦因数变化很小,其值在0.65～0.83,具有很好的摩擦稳定性,磨损量随载荷的增加逐渐增大,但不同载荷下涂层的磨损机理不同,在100N的较低载荷下,涂层以磨粒磨损和刮擦磨损为主,随载荷增加到200、300N时,磨损失重的主要原因是切削磨损和磨粒磨损,当载荷超过400N时,涂层的磨损形式则以磨粒磨损、粘着磨损和剥落磨损的复合磨损形式体现.

Frictional wear characteristics of laser-melted coating of high-aluminium copper alloy under high load and dry friction

High-aluminium copper alloy coating was fabricated on #45 steel substrate with laser-melted cladding.Experimental investigation of dry frictional wear was carried out under high load,in which the coating friction coefficient was determined,the wear morphology was observed,the worn weight loss was measured under different loads,and the wear mechanism of the coating was explored.The result showed that the friction coefficient varied a little from 0.65 to 0.83,indicating that the coating exhibited a good friction stability.The abrasion loss of the coating increased gradually with the load and,however,the abrasion mechanism was different under different loads.Under the load below 100 N,the main wear form was abrasive and scraped wear,and with the load increased to 400 N,the main wear form was cutting and abrasive wear.When the load was more than 400 N,the main wear form became composite form with abrasive wear,adhesive wear,and spalling wear.