Effect of Speed on Friction and Wear Properties of Cu-based Material

According to the performance requirements of brake friction plate in the high speed train, Cu-based friction material was prepared by powder metallurgy technology.The friction components are mainly atomized Fe, a small amount of Cr and SiO2.And a high coefficient is caused by the friction resistance of these particles in the friction surface.The graphite forms a layer of solid lubricating film on the friction surface to ensure a stable friction coefficient under the all kinds of friction conditions.The compressive strength of sintered samples were tested by DDL50 Electronic Universal Testing Machine, and the property of dry friction and wear were tested by vertical universal friction-wear testing machine.The wearing morphologies were observed by SEM and the effects of friction speed on wear rate and friction coefficient were analyzed.The result shows that Cu-based containing larger natural flake graphite and smaller Fe particles has good friction wear performance.And when the load varying from 50N to 150N at the speed of 600r/min, the friction coefficient is about 0.4~0.48, the coefficient varies little and is very stable.The main wear mechanisms are abrasive wear and oxidation wear.