Effects of Ag/RGO composites as lubricant additives on the tribological properties of lubricating oil
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摘要: 通过化学还原合成了银包覆石墨烯(Ag/RGO)复合添加剂, 利用X射线衍射仪和扫描电镜分析了样品相成分和微观形貌, 采用UMT-2摩擦磨损试验机测定了Ag/RGO复合润滑油添加剂的摩擦性能。结果表明: 纳米银颗粒均匀分布在石墨烯片上, 银颗粒的粒径大约200nm。在摩擦磨损试验过程中, 摩擦副与磨损表面的凹凸点直接接触, 纯润滑油的润滑作用较差; 在润滑油中添加Ag/RGO复合添加剂, 在摩擦初始过程中, 摩擦副与磨损表面也是凹凸点直接接触, 随着磨损时间的增加, Ag/RGO复合添加剂在摩擦副与磨损表面之间形成一层润滑膜, 阻隔摩擦副与磨损表面直接接触, 产生边界润滑; 另外, 部分纳米银颗粒可起到微轴承作用, 使得改性后的润滑油润滑性能更好。Abstract: Ag-coated graphene (Ag/RGO) composite additives were successfully synthesized by the chemical reduction method, the phase composition and microstructure of the Ag/RGO composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively, and the tribological properties of the Ag/RGO composites as the lubricant additives were evaluated by UMT-2 friction and wear tester. The results show that, the Ag nanoparticles with the average size of about 200 nm are well-dispersedly attached to the RGO sheets. It is shown that, during the whole wear process, the hard micro-bulges between the counterpart and the worn surface are in physical contact using the pure lubricating oil, which leads to the poor lubricating effect. However, using the lubricating oil with Ag/RGO composite additives, the hard micro-bulges between the counterpart and the worn surface are in physical contact only at the initial wear process; as the wear time increases, a lubricating film forms due to the addition of Ag/RGO composites, which can avoid the direct contact between the worn surface and counterparts, and can further generate the boundary lubrication. Moreover, some of the silver nanoparticles in the Ag/RGO composite additives act as the micro bearings and make the lubricating effect better.
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Key words:
- Ag-coated graphene /
- lubricating oil /
- tribological properties /
- microstructure /
- lubricating film
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图 1 银包覆石墨烯（Ag/RGO）纳米复合材料的合成机理图
Figure 1. Synthetic mechanism of the Ag-coated graphene(Ag/RGO)nanocomposites
图 3 Ag/RGO显微形貌（（a）和（b））和能谱分析（c）
Figure 3. SEM images((a)and(b))and EDS analysis(c)of Ag/RGO
图 4 纯液体石蜡油以及添加RGO和Ag/RGO的液体石蜡油在不同载荷下摩擦系数
Figure 4. Friction coefficients of the liquid paraffin oil without and with the RGO and Ag/RGO additives under the different loads
图 5 纯液体石蜡油，RGO以及Ag/RGO做添加剂的液体石蜡油在2 N载荷下摩擦系数图
Figure 5. Friction coefficients of the liquid paraffin oil without and with the RGO and Ag/RGO additives at the 2 N load
图 6 纯液体石蜡油（a）以及添加RGO（b）和Ag/RGO（c）的液体石蜡油在2 N载荷下磨痕
Figure 6. Wear scratches of the liquid paraffin oil without(a)and with RGO(b)and Ag/RGO(c)additives at the 2 Nload
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