Wear mechanism of Cu-based brake pad for high-speed train braking at speed of 380 km/h
Wear mechanism of Cu-based brake pad for high-speed train braking at speed of 380 km/h
复制标题
时速380公里高速列车制动铜基刹车片磨损机理
DOI：
10.1016/j.triboint.2020.106357
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发表时间：
2020-10-01
影响因子：
6.2
通讯作者：
Zhang, Chao
中科院分区：
文献类型：
--
作者：
Xiao, Jin-Kun;Xiao, Shu-Xian;Zhang, Chao
在制动速度高达380 km/h的条件下，对高速列车铜基刹车片进行了全尺寸试验。研究了原始表面、磨损表面和侧表面的组织、成分和性能。结果表明，摩擦磨损表面经过塑性变形、机械混合、氧化和烧结等过程，形成了约2 μ m厚的CuO和Fe 2 O3纳米结构摩擦膜。摩擦层能够实现比原始表面显著更高的摩擦系数和耐磨性，这可归因于氧化物基组合物和高硬度。磨损表面和侧面的石墨颗粒被烧毁，铜基体被氧化。刹车片的摩擦学性能在很大程度上取决于摩擦膜的成分和微观结构。
Cu-based brake pads for high-speed train were tested in full-scale at braking speeds as high as 380 km/h. The microstructure, composition and properties of the original, worn and lateral surfaces were investigated. The results show that a similar to 2 mu m thick nanostructured tribolayer composed of CuO and Fe2O3 was formed on the worn surface, owing to the plastic deformation, mechanical mixing, oxidation and sintering processes. The tribolayer enables significantly higher friction coefficient and wear resistance than original surface, which can be attributed to oxide-based composition and high hardness. The graphite particles in the worn and lateral surfaces were burned and the copper matrix was oxidized. The tribological property of brake pad highly depends on the composition and microstructure of the tribolayer.