Study on preparation and performance of copper-based powder metallurgy brake pad with excellent wear resistance
In this paper,five kinds of copper-based powder metallurgy brake pads were independently designed,in which the ratio of different shape graphite and SiC content were adjusted,and the physical and mechanical properties,the friction and wear properties of five formula samples were tested and analyzed under the same experimental conditions.The results show that SiC particles have a reinforcing effect on Cu matrix surface,which can significantly improve the wear resistance of brake plate.The simultaneous use of Cr powder and high carbon Cr-Fe powder can strengthen the materials together.When the ratio of SiC is 1.5％and the ratio of lubri-cation group(sheet graphite∶granular graphite∶MoS2)is 9∶8∶1,the brake plate shows excellent high tempera-ture stability,thermal conductivity and heat dissipation and wear resistance,When the braking speed is 350 km/h,the average friction coefficient is 0.337,the highest temperature of the friction surface is 372 ℃,and the wear consumption is only 0.034 7 cm3/MJ,which can fully meet the braking requirements of 350 km/h and and above high-speed trains.This study has an important reference significance for the development and application of copper-based powder metallurgy brake pieces.
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