酯类基础油中纳米 MoS2 和烟尘颗粒的润滑拮抗机制

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL Friction Pub Date : 2024-09-25 DOI:10.1007/s40544-024-0904-5
Chonglong Zhong, Kunhong Hu, Yong Xu, Enzhu Hu, Xianguo Hu
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引用次数: 0

摘要

球形纳米 MoS2(S-MoS2)具有优异的润滑性能,在发动机油添加剂中具有潜在的应用价值。发动机烟尘会进入机油,因此应研究 S-MoS2 与柴油燃烧烟尘(DCS)之间的摩擦学相互作用。本研究使用 DCS 模拟发动机烟尘。在癸二酸二辛酯(DOS)中对其相互作用进行了研究,并对其相互作用机理进行了全面描述。结果表明,S-MoS2 和 DCS 对润滑有明显的拮抗作用。在 DOS 中,0.5% 的 S-MoS2 具有良好的润滑性能,可使摩擦力降低 22%,磨损降低 54%。然而,在被 0.5% DCS 污染的 DOS 中添加 0.5% S-MoS2 后,润滑性能并未得到改善,甚至比未添加 S-MoS2 时更差。添加 S-MoS2 进行 DOS 润滑时,摩擦表面会形成含有 MoS2 的三膜,但同时添加 0.5% DCS 会导致 MoS2 三膜消失。此外,在摩擦热的作用下,DCS 和 S-MoS2 会形成坚硬的 MoxCy,从而增加磨损。最后,还提供了一种初步的去拮抗方法。在上述拮抗剂体系中加入 2.0% 的异辛基二硫代磷酸锌后,摩擦系数没有出现明显变化,但磨损却恢复到了接近只加入 S-MoS2 时的水平。这种拮抗方法并不十分理想,需要进一步探索一些更有效的方法。
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Lubrication antagonism mechanism of nano-MoS2 and soot particles in ester base oil

Spherical nano-MoS2 (S-MoS2) has excellent lubricating properties and potential application value in engine oil additives. Engine soot can enter the engine oil, so the tribological interaction between S-MoS2 and diesel combustion soot (DCS) should be investigated. In this study, DCS was used to simulate engine soot. The interaction was investigated in dioctyl sebacate (DOS), and the interaction mechanism was full characterized. Results showed that S-MoS2 and DCS had obvious antagonism effects on lubrication. The 0.5% S-MoS2 exhibited good lubricating properties in DOS, which could reduce friction by ∼22% and wear by ∼54%. However, after 0.5% S-MoS2 was added to the 0.5% DCS contaminated DOS, the lubrication performance was not improved and was even worse than that without S-MoS2. When S-MoS2 was added for DOS lubrication, a tribofilm containing MoS2 formed on the friction surface, but simultaneously adding 0.5% DCS resulted in the disappearance of the MoS2 tribofilm. Moreover, under the action of friction heat, DCS and S-MoS2 could form hard MoxCy, thereby increasing abrasive wear. Finally, a preliminary deantagonism method was provided. After 2.0% zinc isooctyl dithiophosphate was added to the above antagonistic system, the friction coefficient did not show visible changes, but the wear recovered to a level close to that when only S-MoS2 was added. The antiantagonism method is not very satisfactory and some more efficient methods need to be further explored.

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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.
期刊最新文献
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