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Macroscale tribological properties of fluorinated graphene

机译：氟化石墨烯的宏观摩擦学性能

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摘要

Because graphene is carbon material and has excellent mechanical characteristics, its use as ultrathin lubrication protective films for machine elements is greatly expected. The durability of graphene strongly depends on the number of layers and the load scale. For use in ultrathin lubrication protective films for machine elements, it is also necessary to maintain low friction and high durability under macroscale loads in the atmosphere. In this study, we modified the surfaces of both monolayer and multilayer graphene by fluorine plasma treatment and examined the friction properties and durability of the fluorinated graphene under macroscale load. The durability of both monolayer and multilayer graphene improved by the surface fluorination owing to the reduction of adhesion forces between the friction interfaces. This occurs because the carbon film containing fluorine is transferred to the friction-mating material, and thus friction acts between the two carbon films containing fluorine. On the other hand, the friction coefficient decreased from 0.20 to 0.15 by the fluorine plasma treatment in the multilayer graphene, whereas it increased from 0.21 to 0.27 in the monolayer graphene. It is considered that, in the monolayer graphene, the change of the surface structure had a stronger influence on the friction coefficient than in the multilayer graphene, and the friction coefficient increased mainly due to the increase in defects on the graphene surface by the fluorine plasma treatment. (C) 2017 Elsevier B.V. All rights reserved.
机译：因为石墨烯是碳材料并且具有优异的机械特性，所以非常希望将其用作机械元件的超薄润滑保护膜。石墨烯的耐久性在很大程度上取决于层数和负载规模。为了用于机械元件的超薄润滑保护膜，还必须在大气中的宏观负载下保持低摩擦和高耐久性。在这项研究中，我们通过氟等离子体处理对单层和多层石墨烯的表面进行了改性，并研究了在大型负载下氟化石墨烯的摩擦性能和耐久性。由于降低了摩擦界面之间的粘附力，表面氟化提高了单层和多层石墨烯的耐久性。发生这种情况是因为含氟的碳膜被转移到摩擦配合材料上，因此摩擦作用在两个含氟的碳膜之间起作用。另一方面，在多层石墨烯中，通过氟等离子体处理，摩擦系数从0.20降低到0.15，而在单层石墨烯中，摩擦系数从0.21增加到0.27。据认为，在单层石墨烯中，表面结构的变化对摩擦系数的影响大于在多层石墨烯中，并且摩擦系数增加主要是由于氟等离子体在石墨烯表面上的缺陷增加。治疗。 （C）2017 Elsevier B.V.保留所有权利。

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