Graphene oxide (GO) nanosheets and onion-like carbon (OLC) nanoparticles were synthesized from natural graphite powder and candle soot, respectively, and characterized by transmission electron microscopy and Raman spectroscopy. The lubricating performances of GO and OLC as lubricant additives in water were comparatively evaluated using a ball-on-disc tribometer. The effects of sand blasting of a steel disc on its morphology and tribological property were evaluated. The results show that the two nanomaterials, GO and OLC, when used as lubricant additives in water effectively reduce the friction and wear of the sliding discs, which is independent of the disc surface treatment. On applying heavy loads, it is observed that GO exhibits superior friction-reducing and anti-wear abilities compared to those of OLC—a trace amount of GO can achieve a lubricating ability equivalent to that of an abundant amount of OLC. Furthermore, it is observed that sand blasting cannot improve the wear resistance of the treated steel disc, even though the hardness of the disc increased after the treatment. The possible anti-wear and friction-reducing mechanisms of the GO and OLC as lubricant additives in water are discussed based on results for the wear surfaces obtained by scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy

中文翻译：

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氧化石墨烯和洋葱状碳作为水基润滑剂添加剂的润滑性能，用于光滑和喷砂的钢制圆盘

分别由天然石墨粉和蜡烛烟灰合成氧化石墨烯（GO）纳米片和洋葱状碳（OLC）纳米片，并通过透射电子显微镜和拉曼光谱进行表征。使用圆盘球式摩擦计比较地评估了GO和OLC作为水中的润滑添加剂的润滑性能。评价了钢盘喷砂对其形态和摩擦学性能的影响。结果表明，GO和OLC这两种纳米材料在水中用作润滑剂添加剂时，可有效减少滑动盘的摩擦和磨损，这与盘的表面处理无关。在施加重物时 可以观察到，与OLC相比，GO具有优异的减摩和抗磨性能-微量的GO可以获得与大量OLC相同的润滑能力。此外，可以观察到，即使在处理后钢盘的硬度增加了，喷砂也不能改善处理过的钢钢盘的耐磨性。基于扫描电子显微镜，拉曼光谱和X射线光电子能谱获得的磨损表面的结果，讨论了GO和OLC作为水中润滑剂添加剂的可能的抗磨和降低摩擦的机理 即使治疗后碟片的硬度有所提高。基于扫描电子显微镜，拉曼光谱和X射线光电子能谱获得的磨损表面的结果，讨论了GO和OLC作为水中润滑剂添加剂的可能的抗磨和降低摩擦的机理 即使治疗后碟片的硬度有所提高。基于扫描电子显微镜，拉曼光谱和X射线光电子能谱获得的磨损表面的结果，讨论了GO和OLC作为水中润滑剂添加剂的可能的抗磨和降低摩擦的机理