（1. School of Materials Science and Engineering，East China Jiaotong University，Nanchang 330013，China;
2. State Key Laboratory of Powder Metallurgy，Central South University，Changsha 410083，China; 3. Jiangxi
Huawu Brake Co.，Ltd.，Fengcheng 331100，China; 4. Key Laboratory of Impact and Safety Engineering，Minis‐
try of Education，Ningbo University，Ningbo 315211，China）
Abstract：A copper matrix composite（Cu-MMC for short）for brake pads used to high-speed trains was made by
powder metallurgy technology. The effect of contact pressure on tribological properties of Cu-MMC under wet and
dry conditions was studied, and the wear laws of Cu-MMC and its dual material（namely cast steel）were investi‐
gated. The results indicate that the frictional stabilities increases at first and then decrease, average coefficients of
friction decrease continuously, the wear rate of Cu-MMC increases significantly at first and then decreases slightly,
and the wear rate of cast steel increases rapidly at first and then increases gradually with increasing contact pres‐
sure under dry and wet conditions. The delamination of Cu-MMC under low contact pressure and abrasive wear of
Cu-MMC under high contact pressure are obviously alleviated in wet environment, resulting in low friction coeffi‐
cient and wear rate.
2023, Vol. 33 
