Purpose

This study aims to the preparation and tribological characteristics of graphene/triangular copper nanoplate composites (abbreviated as GN/Cu nanoplates) as grease additive and clarifies the growth mechanism and tribological mechanism of GN/Cu nanoplates by different analysis methods. In this paper, it is expected to alleviate the problems of easy aggregation and poor dispersion stability of graphene in lubricants and provide theoretical support for the application of graphene and its composites in the tribology field.

Design/methodology/approach

In this study, the GN/Cu nanoplates have been successfully prepared by the electrostatic self-assembly method. The structural characteristics of GN/Cu nanoplates were analyzed via transmission electron microscopy and X-ray diffraction. Then the tribological properties of GN/Cu nanoplates were investigated under different loads with SRV-IV [Schwingung, Reibung, Verschleiß (German); oscillating, friction, wear (English translation)] tribotester. White-light interferometry was applied to quantify the wear loss of the disk. The element chemical state on worn surfaces was analyzed by an X-ray photoelectron spectroscope to clarify the tribological mechanism of graphene composites.

Findings

The electrostatic force between the negative charge of graphene and the positive charge of triangular copper nanoplates promotes the self-assembly of GN/Cu nanoplates. With the addition of GN/Cu nanoplates, the wear loss and average friction coefficient under the load of 200 N have been decreased by 72.6% and 18.3%, respectively. It is concluded that the combined action of graphene deposition film and the copper melting film formed on the worn surface could effectively improve the antiwear ability and friction reduction performance of the grease.

Originality/value

This manuscript fulfills a new approach for the preparation of GN/Cu nanoplates. At the same time, its tribological properties and mechanism as a lubricating additive were studied which provide theoretical support for the application of graphene and its composites in the tribology field.

中文翻译：

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石墨烯/三角铜纳米片复合材料作为润滑脂添加剂的制备及摩擦学特性

目的

本研究旨在研究作为润滑脂添加剂的石墨烯/三角铜纳米片复合材料（简称GN/Cu纳米片）的制备及其摩擦学特性，并通过不同的分析方法阐明GN/Cu纳米片的生长机理和摩擦学机理。本文有望缓解石墨烯在润滑剂中易聚集、分散稳定性差的问题，为石墨烯及其复合材料在摩擦学领域的应用提供理论支持。

设计/方法/方法

在本研究中，通过静电自组装方法成功制备了 GN/Cu 纳米片。通过透射电子显微镜和 X 射线衍射分析了 GN/Cu 纳米片的结构特征。然后用 SRV-IV [Schwingung, Reibung, Verschleiß (German); 振荡，摩擦，磨损（英文翻译）] tribotester。应用白光干涉测量来量化磁盘的磨损损失。通过X射线光电子能谱分析磨损表面的元素化学状态，以阐明石墨烯复合材料的摩擦学机理。

发现

石墨烯的负电荷与三角形铜纳米片的正电荷之间的静电力促进了GN/Cu纳米片的自组装。添加 GN/Cu 纳米板后，200 N 载荷下的磨损量和平均摩擦系数分别降低了 72.6% 和 18.3%。结论是石墨烯沉积膜和在磨损表面形成的铜熔膜的共同作用可以有效提高润滑脂的抗磨能力和减摩性能。

原创性/价值

这份手稿实现了一种制备 GN/Cu 纳米板的新方法。同时研究了其作为润滑添加剂的摩擦学性能和机理，为石墨烯及其复合材料在摩擦学领域的应用提供理论支持。