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三种典型铜基刹车片组织性能对比研究

Comparative Study of Three Typical Copper-based Brake Pads in Structure and Performance

  • 摘要: 为了解决传统铜基刹车片在高温制动条件下摩擦系数小、稳定性差且磨损量大的问题。本文以Cu-Fe为主组元,加入Ni、Sn强化元素,以石墨和MoS2为润滑组元,以莫来石、SiC、锆英砂等为摩擦组元,混合后冷压成型,880℃高温固相热压烧结制备出的铜基刹车片,采用X射线衍射仪对材料进行物相分析,对材料的密度、硬度、摩擦系数及磨损量进行了测试分析,采用扫描电子显微镜对材料的磨痕进行观察并进行能谱分析。结果表明:所制备的铜基刹车片磨损率为2.9 mg?(N?m)-1、摩擦系数在0.34~0.41,组织细小分布均匀且高温性能稳定,磨损机制均是磨粒磨损、粘着磨损和疲劳磨损的综合,高温下还发生了氧化磨损。将其与国外同类材料的组织性能进行对比分析,据此可选择不同的应用场景。

     

    Abstract: Aiming at the problem of low friction coefficient, bad stability and high wear, the conventional copper based brake pad is designed in this paper. In this paper, Cu, Fe, Ni and Sn were added as reinforcing elements, Graphite and MoS2 were used as lubricant, and mullite, SiC and zircon were used as friction components. Copper based brake pads were prepared by cold pressing and hot-pressing at 880℃, and their phase was analyzed by X ray diffractometer. The density, the hardness, the friction coefficient and the wear loss were measured. The wear scar was observed by SEM and the energy spectrum analysis was carried out. It was found that the wear rate of the prepared Cu Based Brake Pad was 2.9 mg·(N·m)-1, Friction Coefficient was 0.34~0.41, and the structure was fine and even. The wear mechanism is composed of abrasion, adhesion and fatigue wear, and oxidative wear takes place at high temperature. By comparison with the structure and performance of similar foreign materials, it is possible to select different application cases.

     

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