Effect of graphite lubrication component type on the microstructure formation and properties of high-speed braking Cu-based friction materials
Cu-based friction materials with different lubrication component such as the flake graphite,spherical graphite,coke,artificial graphite,and cryptocrystalline graphite,were prepared by powder metallurgy technology.The tribological and brake performance of Cu-based friction materials with different lubrication component were tested by the MM3000 friction and wear tester.The results show that the average friction coefficient of the Cu-based friction material with artificial graphite as lubrication component is the highest(＞0.40),but the wear loss is the largest of all at the speed of 3 000～7 000 r/min.The friction coefficient of the Cu-based friction material with coke is the second(＞0.375),and the wear loss is the smallest of all.The friction coefficient and wear loss of the Cu-based friction material with coke is good than the Cu-based friction material with commonly used flake graph-ite.Under the braking condition of 7 000 r/min,the instantaneous friction coefficient of Cu-based friction material with artificial graphite is the highest,and the braking time is short.However,the surface temperature rise of the Cu-based friction material with artificial graphite is the largest.The instantaneous friction coefficient and braking time of the Cu-based friction material with coke is second,but the surface temperature rise of friction material is the smallest.The overall performance of the Cu-based friction material with coke is better than the friction material with flake graphite.Therefore,Cu-based friction materials with coke as lubrication component have better tribolog-ical and braking properties,relatively.
Cu-based friction materialslubrication componentfriction and wear propertiesbrake performancemicrostructure
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