Effects of Graphite Content on Performance of Copper-based Friction Materials

Copper-graphite sintered materials with graphite content varying from 2.5% to 30% were prepared by a process of powder metallurgy. The variation of the friction coefficient of the material at different friction speed was investigated, and correspondingly the wear rate was measured. The results show that the friction coefficient and wear rate decrease with the increase of the graphite content. When the content of graphite is less than 10%, the effect of the friction speed on the friction coefficient and wear rate is obvious. Moreover, the wear rate increases quickly with the rising of the friction speed. When the content is more than 15%, the coefficient is steady, and the increase of the wear rate is slight.