Tribological Characteristics of Copper Hybrid Composite at Elevated Temperature

Elevated temperature tribological characteristics of copper matrix composite reinforced with SiC and graphite particles were investigated on an MMU-5G wear machine under 250~400 ℃,and compared with SiC/Cu composite.Results show that addition of graphite particles could decrease the wear rate of both the hybrid composite and the counterpart,while keep the friction coefficient low and stable.Severe adhesive transfer was effectively prevented,therefore low wear rate was maintained until 400 ℃.A continuous graphite-rich mechanically mixing layer was formed on the elevated temperature worn surface in a mechanism of 'wear debris mixing' to 'hot pressing'.Its solid lubricity imparted the(SiC+Gr)/Cu composite with good friction and wear properties at elevated temperatures.