Abstract Cu–Ni-graphite composite is intended to be used as switch slide baseplates in the high-speed railways., The composite is modified by silver element to enhance the tribological properties. Pin-on-disk wear tests were conducted to evaluate the tribological properties. The synergistic lubrication effect generated when the silver-modified Cu–Ni-graphite composite slide against U75V steel. The results showed that the silver-modified Cu–Ni-graphite composite consists of α-Cu, graphite, and a silver phase. The higher graphite content in the composite corresponds to lower coefficient of friction and wear weight loss. Both the coefficient of friction and wear weight loss of the silver-modified composite are much lower than those of the unmodified Cu–Ni-graphite composite. The synergistic lubrication effect of graphite and silver in the composite decrease the friction coefficients and wear weight loss. Compared with the single graphite lubrication, the introduction of the silver phase efficiently enhances the lubricating property and decreases the microcutting and deformation effects. The wear mechanism of silver-modified Cu–Ni-graphite composite with 1–6 wt% graphite content consists of microcutting, oxidation wear, and adhesion wear. The delamination and fatigue wear are resisted at the higher graphite contents by the addition of the silver phase.

中文翻译：

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银改性Cu-Ni-石墨复合材料协同润滑效果研究

摘要 Cu-Ni-石墨复合材料旨在用作高速铁路道岔滑动基板。该复合材料通过银元素改性以提高摩擦学性能。进行销盘磨损试验以评估摩擦学特性。银改性Cu-Ni-石墨复合材料与U75V钢滑动时产生的协同润滑效果。结果表明，银改性的Cu-Ni-石墨复合材料由α-Cu、石墨和银相组成。复合材料中较高的石墨含量对应于较低的摩擦系数和磨损重量损失。银改性复合材料的摩擦系数和磨损重量损失都远低于未改性的 Cu-Ni-石墨复合材料。石墨和银在复合材料中的协同润滑作用降低了摩擦系数和磨损失重。与单一石墨润滑相比，银相的引入有效地增强了润滑性能并降低了微切削和变形效应。石墨含量为 1-6 wt% 的银改性 Cu-Ni-石墨复合材料的磨损机制包括微切削、氧化磨损和粘附磨损。通过添加银相，在较高的石墨含量下可以抵抗分层和疲劳磨损。石墨含量为 1-6 wt% 的银改性 Cu-Ni-石墨复合材料的磨损机制包括微切削、氧化磨损和粘附磨损。通过添加银相，在较高的石墨含量下可以抵抗分层和疲劳磨损。石墨含量为 1-6 wt% 的银改性 Cu-Ni-石墨复合材料的磨损机制包括微切削、氧化磨损和粘附磨损。通过添加银相，在较高的石墨含量下可以抵抗分层和疲劳磨损。