膨胀石墨在球磨期间的微观结构演化及减摩性能
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摘要
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(L_c)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。
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(L_c) 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.
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(L_c) 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.
引文
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[11]LI J L,WANG L J,BAI G Z,et al.Carbon tubes produced during highenergy ball milling process[J].Scripta Mater,2006,54:93-97.
[12]LI J L,PENG Q S,BAI G Z,et al.Carbon scrolls produced by high energy ball milling of graphite[J].Carbon,2005,43(13):2830-2833.
[2]黄海栋,涂江平,干路平,等.片状纳米石墨的制备及其作为润滑油添加剂的摩擦磨损性能[J].摩擦学学报,2005,25(4):312-316.
[3]蒲吉斌,王立平,薛群基.石墨烯摩擦学及石墨烯基复合润滑材料的研究进展[J].摩擦学学报,2014(1):93-112.
[4]史云胜,刘秉琦,杨兴,等.微米级超润滑石墨接触面的表征与分析[J].物理学报,2016(23):158-165.
[5]ANTISARI M V,Montone A,JOVIC N,et al.Low energy pure shear milling:A method for the preparation of graphite nano-sheets[J].Scripta Mater,2006,55:1047-1050.
[6]FRANCKE M,HERMANN H,Wenzel R,et al.Modification of carbon nanostructures by high energy ball-milling under argon and hydrogen atmosphere[J].Carbon,2005,43:1204-1212.
[7]JANOT R,GUERARD D.Ball-milling:the behavior of graphite as a function of the dispersal media[J].Carbon,2002,40:2887-2896.
[8]MILEVA A,WILSON M,KANNANGARA G S K,et al.X-ray diffraction line profile analysis of nanocrystalline graphite[J].Materials Chemistry&Physics,2008,111:346-350.
[9]WELHAM N J,BERBENNI V,CHAPMAN P G.Effect of extended ball milling on graphite[J].Journal of Alloys&Compounds,2003,349:255-263.
[10]CHEN X H,YANG H S,WU G T,et al.Generation of curved or closedshell carbon nanostructures by ball-milling of graphite[J].Journal of Crystal Growth,2000,218:57-61.
[11]LI J L,WANG L J,BAI G Z,et al.Carbon tubes produced during highenergy ball milling process[J].Scripta Mater,2006,54:93-97.
[12]LI J L,PENG Q S,BAI G Z,et al.Carbon scrolls produced by high energy ball milling of graphite[J].Carbon,2005,43(13):2830-2833.