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首页> 外文期刊>Applied Surface Science >Achieving controllable friction of ultrafine-grained graphite HPG510 by tailoring the interfacial nanostructures
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Achieving controllable friction of ultrafine-grained graphite HPG510 by tailoring the interfacial nanostructures

机译：通过定制界面纳米结构实现超细晶粒石墨HPG510的可控摩擦

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摘要

Graphite is an effective solid lubricant due to its self-lubricating properties. However, in practical environments such as ambient air and vacuum, the coefficient of friction (COF) of graphite is still high, resulting in serious wear that limits applications. In this study, two methods are proposed to improve the tribological properties of HPG510, including alcohol-processed two-dimensional (2D) nanomaterials as surface lubricating additives and deposition of a diamond-like carbon (DLC) film on the graphite surfaces. The results show that the COF of graphite decreases from 0.25 to 0.06 when lubricated by graphene oxide (GO)-processed alcohol solution. Similar performance is also observed for fluorinated graphene (GF), and tungsten disulfide (WS2) plus graphene (G) processed solutions. The identified mechanism is the combined lubrication effect of anhydrous alcohol and 2D lubricant materials. Meanwhile, the DLC-deposited graphite not only has a lower COF (similar to 0.10) but also possesses a significant enhancement of the wear resistance. An interesting finding about the anti-friction phenomenon is that some bulk DLC blocks are embedded in the lubricating tribolayer. The present work can provide reliable experimental evidence and a theoretical basis to expand the application field of bulk graphite.
机译：石墨因其自润滑性能而成为一种有效的固体润滑剂。但是，在诸如环境空气和真空的实际环境中，石墨的摩擦系数（COF）仍然很高，导致严重的磨损，从而限制了应用。在这项研究中，提出了两种改善HPG510摩擦性能的方法，包括用醇处理的二维（2D）纳米材料作为表面润滑添加剂，以及在石墨表面沉积类金刚石碳（DLC）膜。结果表明，用氧化石墨烯（GO）处理的醇溶液润滑时，石墨的COF从​​0.25降低至0.06。对于氟化石墨烯（GF）和二硫化钨（WS2）加石墨烯（G）处理的溶液，也观察到类似的性能。确定的机理是无水酒精和2D润滑材料的组合润滑效果。同时，沉积有DLC的石墨不仅具有较低的COF（类似于0.10），而且还具有显着提高的耐磨性。关于减摩现象的一个有趣发现是，一些块状DLC块嵌入了润滑摩擦层中。本研究可以提供可靠的实验证据和理论基础，以拓展块状石墨的应用领域。

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