Abstract: The purpose of this study is to investigate the effect of the alumina and zirconium silicate grain size on friction and wear properties of friction material. The fiber reinforced organic friction materials are prepared by the way of thermoforming, and the friction and wear performance are tested. The effect of zirconium silicate and alumina particle size on the friction and wear properties of multi-fibers rein-forced resin-based friction materials has been investigated. The results show that zirconium silicate and alumina play significant role in increasing friction coefficient. With decreasing fillers particle size, the friction coefficient decrease. But coefficient stability is the best when filler size is middle. And it has also been found that the coefficients of friction changes slightly with decreasing particle size. By observing the morphology of the sample surface after wear, and to explore the mechanism of friction and wear. The SEM micrographs show that the moderate size of alumina and zirconium silicate added to the friction material play a protective role on surfaces and can reduce the wear.

Key words: filler, particle size, friction and wear