Exploring braking behaviors of powder metallurgy (PM) brake pads mating with different brake discs is conducive to promoting the development of high-speed trains. In this study, the braking behaviors and wear mechanisms of Cu-based PM brake pads mating with C/C–SiC and 30CrMnSi steel disc, respectively, under high-energy braking condition have been investigated. Results show that compared with PM-30CrMnSi brake pair, the coefficient of friction (COF) and stability coefficient of PM-C/C–SiC brake pair are increased by 28.9% and 13.9%, respectively, and the PM pad wear rate and braking time are reduced by 31.0% and 29.5%. Moreover, PM-C/C–SiC brake pair does not exist obvious tail warping in braking curve, which can be attributed to the formation of dense tribo-layer and the lubrication of carbon fibers. TEM analysis shows that the tribo-layer of PM-C/C–SiC brake pair is composed of nanostructured oxide layer and plastic deformation layer. Besides, a ∼600 nm thick oxide layer containing nano-sized Cu/Fe oxides and ZrSiO₄ particles greatly improves COF and wear resistance of PM pad. The dominant wear mechanisms of PM-C/C–SiC brake pair are delamination and oxidation wear, whilst those of PM-30CrMnSi brake pair are abrasive and adhesive wear.

探索粉末冶金（PM）刹车片与不同制动盘配合的制动行为，有利于促进高速列车的发展。在本研究中，分别研究了与 C/C-SiC 和 30CrMnSi 钢盘配合的 Cu 基 PM 制动片在高能制动条件下的制动行为和磨损机制。结果表明，与PM-30CrMnSi制动副相比，PM-C/C-SiC制动副的摩擦系数（COF）和稳定性系数分别提高了28.9%和13.9%，PM刹车片磨损率和制动时间分别减少了 31.0% 和 29.5%。此外，PM-C/C-SiC制动副在制动曲线中不存在明显的尾部翘曲，这可以归因于致密摩擦层的形成和碳纤维的润滑。TEM 分析表明 PM-C/C-SiC 制动副的摩擦层由纳米结构氧化层和塑性变形层组成。此外，约 600 nm 厚的氧化物层包含纳米尺寸的 Cu/Fe 氧化物和 ZrSiO₄颗粒大大提高了PM垫的COF和耐磨性。PM-C/C-SiC 制动副的主要磨损机制是分层和氧化磨损，而 PM-30CrMnSi 制动副的主要磨损机制是磨粒和粘着磨损。