Abstract The braking performance of copper-based brake pads containing Cu-coated SiO2 and uncoated SiO2 was tested on a reduced-scale dynamometer. Results showed that both the stability of the friction coefficient and the wear resistance are improved and the fade phenomenon of the friction coefficient is effectively alleviated during continuous emergency braking (350 km/h, 0.48 MPa) by introducing Cu-coated SiO2 into the copper-based brake pad. The better braking performance is closely related to the improved interfacial bonding and the firm pinning of SiO2 particles on the friction surface. The copper coating on SiO2 reduces the spalling of SiO2 particles from the copper matrix during the braking process. Therefore, for the sample containing Cu-coated SiO2, the SiO2 particles pinned on the friction surface act as trapping sites for wear debris, promoting the formation of secondary plateaus. As a result, the existence of stable primary and secondary plateaus in the braking process promotes the stability of the friction coefficient.

中文翻译：

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利用Cu包覆SiO2粉末提高Cu基刹车片的制动性能

摘要 在缩尺测功机上测试了含Cu 包覆SiO2 和未包覆SiO2 的铜基刹车片的制动性能。结果表明，在铜镀层中引入Cu包覆SiO2，提高了摩擦系数的稳定性和耐磨性，有效缓解了连续紧急制动（350km/h，0.48MPa）时摩擦系数的衰减现象。基于刹车片。更好的制动性能与改进的界面结合和SiO2颗粒在摩擦表面的牢固钉扎密切相关。SiO2 上的铜涂层减少了制动过程中 SiO2 颗粒从铜基体上的剥落。因此，对于含有 Cu 包覆 SiO2 的样品，固定在摩擦表面上的 SiO2 颗粒充当磨损碎屑的俘获点，促进二次平台的形成。因此，制动过程中稳定的初级和次级平台的存在促进了摩擦系数的稳定性。