Mono-dispersed Ag/Graphene nanocomposite as lubricant additive to reduce friction and wear
Mono-dispersed Ag/Graphene nanocomposite as lubricant additive to reduce friction and wear
复制标题
单分散银/石墨烯纳米复合材料作为润滑剂添加剂以减少摩擦和磨损
DOI：
10.1016/j.triboint.2020.106228
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发表时间：
2020-06-01
影响因子：
6.2
通讯作者：
Cao, Bingqiang
中科院分区：
文献类型：
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作者：
Wang, Li;Gong, Peiwei;Cao, Bingqiang
独特的结构和优异的机械性能赋予银/石墨烯纳米复合材料在许多润滑领域的巨大潜力。但其易聚集、分散性差、合成程序复杂等问题一直困扰着人们。在此，我们报道了一种简单有效的一步激光照射策略来制造银/石墨烯纳米复合材料，该复合材料有效地避免了聚集并具有良好的分散稳定性。结构研究证实，单分散的银（Ag）纳米球均匀地生长在层状石墨烯片上，这种规则的层状结构进一步保证了增强的润滑效果。摩擦学实验表明，添加 0.1 wt% 的这种复合材料可以轻松地将摩擦系数和磨损点直径分别降低 40% 和 36%。详细的润滑机理实验表明，这种层状结构引起的自润滑、从滑动摩擦到滚动摩擦的转变以及银纳米球的自修复作用协同促进了优异的润滑性能。更重要的是，与商业润滑油添加剂相比，这种银/石墨烯纳米复合材料表现出更好的润滑效果，并且不含金属腐蚀和环境污染元素。这项研究表明，激光照射是一种强有力的策略，可以制备独特的层状复合材料，用于有前途的润滑剂添加剂，以减少摩擦和磨损。
The unique structure and excellent mechanical property endow silver/graphene nanocomposite with great potential in many lubrication fields. However, its easy aggregation, poor dispersibility and complex synthesis procedures have long been a headache. Herein, we report a simple and effective one-step laser irradiation strategy to fabricate a silver/graphene nanocomposite, which effectively avoids the aggregation and enjoys a good dispersion stability. Structural investigation confirms that mono-dispersed silver (Ag) nanospheres evenly grow on the layered graphene sheets, and this regularly laminated structure further guarantee enhanced lubricating effect. Tribological experiments demonstrate that 0.1 wt% addition of this composite could readily reduce the friction coefficient and wear spot diameter by 40% and 36%, respectively. Detailed lubricating mechanism experiments demonstrate that self-lubrication induced by such layered structure, the change from sliding friction to rolling friction, and the self-repair effect due to Ag nanospheres synergistically contribute to the excellent lubricating performance. More importantly, in comparison with commercial lubricant additives, such Ag/graphene nanocomposites exhibit better lubricating effect and contain no metal corrosion and environmental pollution elements. This study demonstrates that laser irradiation is a powerful strategy to prepare unique layered composite materials for promising lubricant additive to reduce friction and wear.