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采用粉末冶金方法制备了含有不同Cu质量分数(2%~4%)的Ag-Cu-MoS_2复合材料,并对其力学性能、电学性能和真空载流磨损性能进行了研究.结果表明:较高Cu质量分数的Ag-Cu-MoS_2复合材料表现出较高的硬度和抗弯强度;中等Cu质量分数(2.5%和3%)的Ag-Cu-MoS_2复合材料电刷表现出较低的电压降和电噪声;滑动速度的增加会降低材料间的接触稳定性,进而导致较高的电压降和较大的电噪声.在真空载流条件下与Ag合金盘滑动摩擦过程,不同Cu质量分数的Ag-Cu-MoS_2复合材料电刷均表现出较低的磨损,其磨损率在1×10~(–14)m~3/(N·m)~2.5×10~(–14)m~3/(N·m)范围,其磨损机理主要为疲劳磨损以及黏着磨损.
Ag-Cu-MoS 2 composites with different Cu content (2% ~ 4%) were prepared by powder metallurgy method, and their mechanical properties, electrical properties and vacuum carrier flow wear properties were studied.The results showed that the higher Ag-Cu-MoS 2 composites with Cu mass fraction exhibited higher hardness and flexural strength. Ag-Cu-MoS 2 composite brushes with medium Cu mass fraction (2.5% and 3%) exhibited lower voltage drop And electrical noise.The increase of sliding speed will reduce the contact stability between materials and lead to higher voltage drop and larger electrical noise.Calculation of the sliding friction process with Ag alloy disk under vacuum current conditions, The wear rate of Ag-Cu-MoS_2 composite brush shows a low wear rate of 1 × 10 ~ (-14) m ~ 3 / (N · m) ~ 2.5 × 10 ~ (-14) m ~ 3 / (N · m) range, the wear mechanism mainly fatigue wear and adhesive wear.