Mechanical and tribological behaviors of copper metal matrix composites for brake pads used in high-speed trains. (March 2018)

• Record Type: Journal Article
• Authors: Xiao, Yelong; Zhang, Zhongyi; Yao, Pingping; Fan, Kunyang; Zhou, Haibin; Gong, Taimin; Zhao, Lin; Deng, Minwen
• Is Part Of: Tribology international. Volume 119(2018)
• Page Start: 585
• Page End: 592
• Publication Date: 2018-03
• Subjects: Metal matrix composites -- Mechanical properties -- Friction materials -- Brake pad; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2017.11.038
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: As one of the most important components in high-speed trains, demands are improved on the mechanical and tribological properties of materials for brake pads. In this study, a newly developed copper metal matrix composite (Cu-MMC) for the aforementioned brake pads was fabricated by powder metallurgy route. The microstructure and mechanical properties of Cu-MMC were investigated. Cu-MMC was tribo-evaluated by a full-scale dynamometer, and special attention was paid on the braking performances during emergency stop-braking at initial speeds from 300 to 380 km/h. Examination and analysis of the worn surface and subsurface corroborated the wear mechanism. The results indicate that Cu-MMC exhibits excellent properties and can meet the technical requirements, so it holds great promise for applications in high-speed trains. Highlights: A newly developed copper metal matrix composite for high-speed trains was fabricated by powder metallurgy route. The braking tests were conducted on a full-scale dynamometer designed to simulate brake characteristics of high-speed trains. Compared with materials in service, Cu-MMC exhibited superior mechanical and tribological properties. The worn surface and subsurface were characterised by SEM and EDS.