Comparison of braking behaviors between iron- and copper-based powder metallurgy brake pads that used for C/C–SiC disc

• Published in: Tribology international 2021-02, Vol.154, p.106686, Article 106686
• Main Authors: Ma, Xu, Luan, Chenghua, Fan, Shangwu, Deng, Juanli, Zhang, Litong, Cheng, Laifei
• Format: Article
• Language: English
• Subjects: Abrasion; Brakes; Braking; Braking behaviors; C/C–SiC disc; Coefficient of friction; Copper; Friction; High speed rail; Iron; Powder metallurgy; Powder metallurgy pads; Silicon carbide; Wear mechanism; Wear mechanisms
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2020.106686

Powder metallurgy (PM) brake pads with stable friction behavior are one of the ideal choices for the counterparts of C/C–SiC brake disc that are expected to be applied to the future high-speed trains. In this study, iron- and copper-based PM pads were used to mating with the C/C–SiC brake disc. After testing the brake pairs using a lab-scale dynamometer, the C/C–SiC disc generated almost no wear loss. The coefficient of friction of the carbon/ceramic disc-PM pads brake pair varied nearly between 0.35 and 0.6 under different braking conditions. The analysis of friction surface indicated that the wear mechanism of Fe-based PM pads was mainly dominated by abrasion, while that of Cu-based pair mainly relied on adhesion and fatigue peeling. •Braking behaviors of iron- and copper-based brake pads was compared when mating them with C/C–SiC disc.•After braking tests, the C/C–SiC disc nearly generated no wear loss.•Design concepts of the brake pads suitable for C/C–SiC disc that used for high-speed trains was proposed.