铜基粉末冶金摩擦块摩擦磨损特性研究

A Study on Friction and Wear Characteristics of Copper-Based Powder Metallurgy Friction Blocks

为了探究铜基粉末冶金闸片块的摩擦磨损特性,在UMT-5摩擦试验机上进行销-盘摩擦试验,研究分析了转速、压力、温度对摩擦磨损性能的影响,并用3D光学显微镜对摩擦表面形貌进行分析。研究表明:摩擦块在235N法向压力时,随着摩擦盘转速的升高和摩擦时间的增加,摩擦块表面逐渐形成稳定的摩擦膜,平均摩擦系数先上升后下降,磨损量先下降后上升,然后再下降;在353N的法向压力下,随着摩擦盘转速的升高和摩擦时间的增加,没有形成稳定的摩擦膜,平均摩擦系数呈增大趋势,磨损量先减小后增大。两种压力下摩擦块的主要磨损形式都从轻微剥落向磨粒磨损转变,最终转变为剥层磨损和黏着磨损。

To investigate the friction and wear performance of the copper-based powder metallurgy braking pad,a pin-disk friction test was conducted on the Universal Material Tester(UMT-5).The influence of rotating speed,pressure and temperature on friction coefficient was analyzed and the surface morphology was observed by using a 3D optical microscope.Following results were obtained:At the 235N normal pressures,a stable friction film is gradually formed on the pad surface as the rotating speed and friction time increase.The average friction coefficient showed a trend of increasing first and then decreasing.The wear of pad and disc both decreased first and then increased,and then decreased again.At the 353N normal pressures,the stable friction film did not appear,the average friction coefficient showed a trend of increasing,and wear of the pad decreased at first and then increased and the wear of the disc increased approximately linearly.The wear mode of the friction block under both pressures changed from slight peeling to abrasive wear,and finally to delamination wear and dhesive wear.