【摘要】 本研究采用粉末冶金工艺制备出含纳米NbSe2(1wt%~9wt%)的铜–石墨自润滑复合材料。在微摩擦试验机及超低温摩擦试验机上进行摩擦磨损实验,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)等分析其物相、形貌及磨痕,并探讨了该复合材料在大气、真空试验条件下的磨损机理。结果表明:NbSe2的加入显著提高铜基复合材料的摩擦学性能;真空干摩擦条件下不含NbSe2复合材料的摩擦系数有所增大,但添加NbSe2(5.5wt%)的自润滑复合材料摩擦系数更小(μ=0.185),承载能力更高,其磨损是粘着磨损、接触疲劳磨损共同作用的结果。更多还原

【Abstract】 Cu-graphite self-lubrication composite containing nano NbSe2(0–9wt%) was fabricated by powder metallurgy technology. Friction property of the sample was investigated using micro-tribometer and ultra-low-temperature tribometer under atmosphere and vacuum conditions. The microstructure, phase and wear scar were also investigated by XRD and SEM. The results showed that tribological property was significantly improved after nano NbSe2 being added to the Cu-graphite self-lubrication composite. The composite with nano NbSe2(5.5wt%) had smaller friction coefficient(μ=0.185) under vacuum dry friction conditions and higher carrying capacity than those of the composite without NbSe2. It was found that the wear could be attributed to adhesive wear together with contact fatigue wear.更多还原