Expanded graphite was ball-milled for 0, 60 h, 80 h and 100 h, in a high-energy planetary-type mill. The nanostructure evolution of expanded graphite during ball-milling was characterized by XRD, HRTEM and SEM, and the antifriction effect of ball-milled expanded graphite used as lubricating oil additive was studied. The results show that during the milling process the crystallite size (Lc) decrease degree of expanded graphite is far lower compared with that of most natural graphite under similar test condition. Ball-milled expanded graphite remains the residual porous structure of original expanded graphite, but its diameter and wall of pore decreases to nanometer dimension strongly. It shows a marked antifriction effect used as lubricating oil additive, and the effect is better than natural graphite and original expanded graphite.%对膨胀石墨进行行星式高能球磨0、60 h、80 h和100 h.使用XRD、HRTEM、SEM分析了膨胀石墨在球磨期间的微观结构演化,研究球磨膨胀石墨作为润滑油添加剂的减摩性能.结果显示,与大多数类似试验条件的天然石墨相比,膨胀石墨在球磨期间的平均微晶尺寸(Lc)减小程度低很多.膨胀石墨经过长时间球磨后仍具有原始膨胀石墨丰富的多孔结构,但孔径和孔壁厚度均大幅下降至纳米级尺寸.球磨膨胀石墨作为润滑油添加剂具有良好的减摩效果,且减摩效果优于天然石墨和未球磨膨胀石墨.
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