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<p>To avoid the unstable friction coefficient and severe wear of conventional Cu-matrix friction material used as the brake pads for high-speed trains, the matrix alloying method based on high-temperature and high-strength copper alloys was used to enhance the service performance. Three kinds of friction materials based on Cu-Ni-Al, Cu-Ni-Cr, and Cu-Ni-Si high-temperature and high-strength copper alloys were obtained by powder metallurgy, and their mechanical and tribological properties were studied in this work. The results show that the hardness and compressive strength of the friction materials are significantly enhanced by the solid-solution strengthening and second-phase precipitation strengthening. High-temperature and high-strength copper alloy matrix friction materials have excellent tribology performance. Among these, Cu-Ni-Al matrix friction material demonstrates the best tribological performance. Compared to commercial pure Cu matrix friction material, the wear rate of Cu-Ni-Al matrix friction material at room temperature is reduced by 59%, and the friction coefficient stability is enhanced by 75%. At high temperature, the wear rate of Cu-Ni-Al matrix friction material is reduced by 62%, and the friction coefficient stability is increased by 36%, which is expected to meet the service requirements of the brake pads of higher-speed trains.</p>

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Study on the Properties of High-Temperature and High-Strength Copper Alloy Matrix Friction Materials

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Mingjuan Zhao,
  • Wenjia Li,
  • Longzhi Zhao,
  • Gen Li,
  • Yong Hu,
  • Haitao Jiao,
  • Hongbing Yu

摘要

To avoid the unstable friction coefficient and severe wear of conventional Cu-matrix friction material used as the brake pads for high-speed trains, the matrix alloying method based on high-temperature and high-strength copper alloys was used to enhance the service performance. Three kinds of friction materials based on Cu-Ni-Al, Cu-Ni-Cr, and Cu-Ni-Si high-temperature and high-strength copper alloys were obtained by powder metallurgy, and their mechanical and tribological properties were studied in this work. The results show that the hardness and compressive strength of the friction materials are significantly enhanced by the solid-solution strengthening and second-phase precipitation strengthening. High-temperature and high-strength copper alloy matrix friction materials have excellent tribology performance. Among these, Cu-Ni-Al matrix friction material demonstrates the best tribological performance. Compared to commercial pure Cu matrix friction material, the wear rate of Cu-Ni-Al matrix friction material at room temperature is reduced by 59%, and the friction coefficient stability is enhanced by 75%. At high temperature, the wear rate of Cu-Ni-Al matrix friction material is reduced by 62%, and the friction coefficient stability is increased by 36%, which is expected to meet the service requirements of the brake pads of higher-speed trains.