Effects of graphite-based material size on mechanical and tribological performance of polyimides under drying sliding condition

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Changxin Wan, Dan Jia, Shengpeng Zhan, Wulin Zhang, Tian Yang, Yinhua Li, Jian Li, Haitao Duan
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Abstract

 The present investigation evaluates the effect of graphite-based filler (GBF) size on the mechanical and tribological performance of polyimide (PI) solid lubricant composites. During dry sliding tribological experiments, micron-, nano-graphite (MG, NG), and ultrathin graphene (GN) additives were considered. The results revealed that atomic-thickness GN outperformed micron- and nano-sized GBF filler in terms of mechanical and tribological performance when added into PI matrix. It was inferred that the GN was able to generate sufficient lubricating phases at the frictional interface due to their small size and ultrathin morphology, which provided them with enhanced tribological properties in comparison with the micro and nano-sized GBF fillers. GN oxidized by reciprocating shear force and friction heat at friction interface and subsequently formed lubricating layer consisting of graphene oxide (GO), as characterized by FTIR and Raman, spectroscopy. Atomistic modeling techniques was also used to elucidate the surface/interface lubrication mechanism, where GO was tightly adsorbed at frictional interfaces by van der Waals. The results facilitate better understanding of size effect on wear mechanism for solid lubricants.

Abstract Image

石墨基材料尺寸对干燥滑动条件下聚酰亚胺力学和摩擦学性能的影响
本研究评估了石墨基填料(GBF)尺寸对聚酰亚胺(PI)固体润滑剂复合材料力学和摩擦学性能的影响。在干滑动摩擦学实验中,考虑了微米,纳米石墨(MG, NG)和超薄石墨烯(GN)添加剂。结果表明,原子厚度GN在加入到PI基体中时,其力学性能和摩擦学性能都优于微米级和纳米级GBF填料。由此推断,GN由于其小尺寸和超薄的形貌,能够在摩擦界面产生足够的润滑相,这使得其与微纳米级GBF填料相比具有更强的摩擦学性能。GN在摩擦界面处被往复的剪切力和摩擦热氧化,随后形成由氧化石墨烯(GO)组成的润滑层,用红外光谱和拉曼光谱对其进行了表征。原子建模技术也用于阐明表面/界面润滑机制,其中氧化石墨烯在摩擦界面上被范德瓦尔斯紧密吸附。研究结果有助于更好地理解固体润滑剂的尺寸效应对磨损机理的影响。
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来源期刊
Friction
Friction Engineering-Mechanical Engineering
CiteScore
12.90
自引率
13.20%
发文量
324
审稿时长
13 weeks
期刊介绍: Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.
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