Abstract Different Cu-based brake pads applied in high-speed railway trains were fabricated by the co-addition of Cr and CrFe particles, and the influence of the Cr/CrFe ratio on the tribological behavior of the powder metallurgy brake pads were studied by a reduced scale testing apparatus with the pad-on-disc configuration under various braking speeds. The results indicated that the Cu-based brake pad containing 6 wt% Cr and 4 wt% CrFe exhibited the highest and the most stable friction coefficient as well as the lowest wear loss when the braking speed was higher than 300 km/h. Moreover, a new reasonable explanation is provided for the effect of Cr and CrFe particles during the braking process. The excellent braking properties are attributed to the synergistic effect of Cr and CrFe on promoting the formation and stabilization of a tribofilm. Cr particles, which have high reactivity with Fe and O, act as a steady source of fine oxides in the tribofilm, and CrFe particles bear the load and strengthen the subsurface in the position near the friction surface. It is clear that the application of an appropriate ratio between Cr and CrFe can develop Cu-based brake pads suitable for more serious braking conditions.

中文翻译：

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Cr和CrFe颗粒对Cu基粉末冶金刹车片制动性能的协同作用

摘要 通过共添加 Cr 和 CrFe 颗粒制备了应用于高速铁路列车的不同 Cu 基刹车片，并研究了 Cr/CrFe 比对粉末冶金刹车片摩擦学行为的影响。在各种制动速度下具有盘上垫配置的缩小规模的测试设备。结果表明，当制动速度高于300 km/h时，含有6 wt% Cr和4 wt% CrFe的Cu基刹车片表现出最高和最稳定的摩擦系数以及最低的磨损损失。此外，对Cr和CrFe颗粒在制动过程中的作用提供了新的合理解释。优异的制动性能归因于 Cr 和 CrFe 对促进摩擦膜形成和稳定的协同作用。与 Fe 和 O 具有高反应性的 Cr 颗粒作为摩擦膜中细氧化物的稳定来源，CrFe 颗粒承受载荷并在靠近摩擦表面的位置强化次表面。很明显，应用适当的 Cr 和 CrFe 比例可以开发出适用于更严重制动条件的铜基刹车片。