A Study on Friction and Wear Characteristics of Copper-Based Powder Metallurgy Friction Blocks
To investigate the friction and wear performance of the copper-based powder metallurgy braking pad,a pin-disk fric-tion 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 in-creased 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.
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