Lubrication Performance Under Electrical Regulation: Investigating the Mechanism of Graphene/Ionic Liquid Composite Materials

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2024-09-03 DOI:10.1007/s11249-024-01907-8

Qingson Jing, Ming Zhou, Baoying Lu, Xiao Li, Jianxin Wang, Naiyao Mao

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Abstract

To delve into the mechanisms of lubricating additives in electrically charged environments, this study utilizes a non-covalent modification method combining N-butylpyridinium tetrafluoroborate ([BPy]BF₄) with multilayer graphene (MG) to create graphene/ionic liquid (G/IL) composites. These composites were tested as lubricating additives in polyalphaolefin 40 (PAO40) using the UMT-2 experimental platform to assess their performance and electrical regulation mechanisms. Results demonstrated that G/IL composites significantly enhance lubrication and electrical stability. The study discovered that varying the current’s intensity and polarity substantially influences ion concentration and Zeta potential at the interface, reducing the electroviscous effect and facilitating the formation of an interfacial adsorption film. The interplay of these mechanisms greatly optimizes the interface condition. Additionally, real-time contact resistance data indicated a correlation between friction coefficient and contact resistance, validating the synergistic effect’s impact. This research not only clarifies the complex action mechanisms of lubricating additives in charged conditions but also offers critical insights for designing highly efficient lubricating materials.

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电调节下的润滑性能：石墨烯/离子液体复合材料的机理研究

为了深入研究润滑添加剂在带电环境中的作用机理，本研究采用了一种非共价改性方法，将 N-丁基吡啶鎓四氟硼酸盐（[BPy]BF4）与多层石墨烯（MG）相结合，制成石墨烯/离子液体（G/IL）复合材料。利用 UMT-2 实验平台对这些复合材料作为聚α烯烃 40 (PAO40) 的润滑添加剂进行了测试，以评估其性能和电调节机制。结果表明，G/IL 复合材料可显著提高润滑性和电气稳定性。研究发现，改变电流强度和极性会极大地影响界面上的离子浓度和 Zeta 电位，从而降低电粘性效应，促进界面吸附膜的形成。这些机制的相互作用极大地优化了界面条件。此外，实时接触电阻数据表明，摩擦系数与接触电阻之间存在相关性，验证了协同效应的影响。这项研究不仅阐明了润滑添加剂在带电条件下的复杂作用机制，还为设计高效润滑材料提供了重要启示。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.