Friction and wear behavior of Cu-Fe{sub}3Al powder metallurgical composites in dry sliding

摘要

The dry sliding wear behaviour of unreinforced Cu alloy and on Cu-Fe{sub}3Al compositesfabricated by a powder metallurgy technique was tested on a block-on-ring test machine. The effectsof the contact pressure and the sliding speed on the wear behavior of Cu-Fe{sub}3Al composites and wear mechanisms during dry sliding were investigated. The worn surfaces were examined by scanning electron microscopy (SEM) and energy dispersivespectrometry (EDS). It was found thatthe coefficients of friction for the Cu-Fe{sub}3Al composites were approximately independent of the contact pressure and the sliding speed variation. With increasing volume fraction of Fe{sub}3Al particle, wear resistance of the composites increased atlower contact pressures but not at higher contact pressures, and the coefficients of friction slightly decreased. Because of formation of a protective oxide film on the sliding surface of the specimen at a low contact pressure and high sliding speed, andincrease in the work-hardening rate in the subsurface layer of the wear specimen, the wear rate of Cu-Fe{sub}3Al composites decreased with the sliding speed.