Tribological properties of Al-GNP composites at elevated temperature

IF 6.3 1区工程技术 Q1 ENGINEERING, MECHANICAL Friction Pub Date : 2024-05-01 DOI:10.1007/s40544-023-0839-2

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Abstract

Lighter and more powerful next generation vehicles and other rotary machinery demand bearings to operate in harsher conditions for higher efficiency, and the continuous development of advanced low-wear and friction materials is thus becoming even more important to meet these requirements. New aluminium composites reinforced with high performance lubricate phases such as graphene nanoplatelets (GNPs) are very promising and have been vigorously investigated. By maintaining a low coefficient of friction (COF) and offering great strength against wear due to their self-lubricating capability, the solid lubricant like GNPs protect the bearing surface from wear damage and prevent change in metallurgical properties during temperature fluctuations. This paper first studies the high-temperature tribological performance of aluminium matrix composites reinforced with GNP, consolidated via powder metallurgy, then elucidates their tribological mechanism. We report that the best tribological performance is achieved by the composite containing 2.0 wt% GNP, with an extraordinarily low COF of 0.09 and a specific wear rate of 3.5×10⁻² mm³·N⁻¹·m⁻¹, which represent 75% and 40% reduction respectively, against the plain aluminium consolidated under identical conditions. The in-track and out-of-track Raman analysis have confirmed the role of GNPs in creating a tribofilm on the counterpart surface which contributed to the excellent performance.

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高温下 Al-GNP 复合材料的摩擦学特性

摘要重量更轻、功率更大的下一代汽车和其他旋转机械要求轴承在更恶劣的条件下工作以提高效率，因此，不断开发先进的低磨损和摩擦材料对于满足这些要求变得更加重要。用石墨烯纳米颗粒（GNPs）等高性能润滑相增强的新型铝复合材料前景非常广阔，并已得到大力研究。通过保持较低的摩擦系数（COF），并通过其自润滑能力提供强大的抗磨损强度，GNPs 等固体润滑剂可保护轴承表面免受磨损，并防止在温度波动时发生冶金性能变化。本文首先研究了通过粉末冶金法固结的 GNP 增强铝基复合材料的高温摩擦学性能，然后阐明了其摩擦学机理。我们发现，含 2.0 wt% GNP 的复合材料具有最佳的摩擦学性能，其 COF 值为 0.09，比磨损率为 3.5×10-2 mm3-N-1-m-1，与相同条件下固结的普通铝相比，分别降低了 75% 和 40%。轨内和轨外拉曼分析证实了 GNPs 在对应表面形成三膜的作用，这有助于实现优异的性能。

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来源期刊

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.