Abstract Ag–C fiber brushes with high wear resistance and low friction were fabricated by the silver alloy fibers and carbon fibers. The tribological properties of the Ag–C fiber brushes and Ag fiber brush were evaluated, and the worn surfaces of the fiber brushes and coin-silver discs were analyzed to investigate the self-lubricating mechanism of Ag–C fiber brushes. The lubricating films containing C were generated on the worn surfaces, therefore, Ag–50%C fiber brush exhibited a low wear rate of 4.39 × 10−6 mm3/N·m and a friction coefficient as low as 0.297 under vacuum condition. Increasing the applied load increased the friction coefficient and wear rate of the fiber brushes, and the electrical noise and contact resistance had opposite tendency. When the environment changed from air to vacuum, the wear rates of the fiber brushes increased. The electrical noise and contact resistance of the fiber brushes under vacuum were extremely low. The contact resistance of the fiber brushes under air condition was higher than those under vacuum condition due to the existence of the oxide film on the worn surface.

中文翻译：

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Ag-C纤维刷在空气和真空条件下的摩擦学行为和自润滑机制

摘要 采用银合金纤维和碳纤维制备了具有高耐磨性和低摩擦性的Ag-C纤维电刷。评估了 Ag-C 纤维刷和 Ag 纤维刷的摩擦学性能，并分析了纤维刷和硬币银盘的磨损表面，以研究 Ag-C 纤维刷的自润滑机制。在磨损表面产生含 C 的润滑膜，因此，Ag–50%C 纤维刷在真空条件下表现出 4.39 × 10-6 mm3/N·m 的低磨损率和低至 0.297 的摩擦系数。增加施加的载荷会增加纤维刷的摩擦系数和磨损率，而电噪声和接触电阻则呈相反趋势。当环境从空气变为真空时，纤维刷的磨损率增加。真空下纤维刷的电噪声和接触电阻极低。由于磨损表面氧化膜的存在，纤维刷在空气条件下的接触电阻高于真空条件下的接触电阻。