Effect of graphite type on the contact plateaus and friction properties of copper-based friction material for high-speed railway train

Copper-based friction materials containing the same graphite concentrations but varied proportion of granular graphite to flake graphite were prepared by powder metallurgy for high-speed railway trains. The friction coefficient and specific wear rate were tested on pin on disc machine. The results showed that the addition of appropriate granular graphite can improve the magnitude and stability of friction coefficient and help to form the...