Research On Friction And Wear Property Of The Friction Materials With Several Carbon Filler Materials

This paper is to research the influence of five carbon fillers of petroleum coke, spherical graphite, flake graphite, artificial graphite and bamboo charcoal on the friction and wear performance of braking friction materials under high speed or high pressure, through the adjustment of carbon filler content and hybrid use of several carbon filler. It is indicated by the experimental results that friction materials containing petroleum coke or artificial graphite possess good friction coefficient at high temperature, but high wear loss, the friction material containing flake graphite possesses stable friction coefficient, but much high wear loss at high temperature, the friction material containing spherical graphite or bamboo charcoal possesses less wear loss, but decreased friction coefficient at high temperature. It is found by using two carbon fillers of petroleum coke, spherical graphite, artificial graphite and bamboo charcoal that friction material with petroleum coke and bamboo charcoal has better friction and wear performance, and friction material with artificial graphite and bamboo charcoal in the ratio of 3 to 1 has smooth friction performance and low wear loss under high pressure.It is showed by experimental results that there appears unavoidably low friction coefficient or high wear loss at high temperature for friction material containing single carbon filler, although the properties of friction and wear for the friction material can improve in certain rang by the content regulation of single carbon filler. The performance of friction and anti-wear for friction material can be much upgraded by hybrid use of several carbon filler. Stable friction coefficient and much low wear loss at high temperature and high speed under high pressure can be obtained for the friction material containing petroleum coke and artificial graphite and bamboo charcoal with the ratio of 1.5 to 1.5 to1.