Impact of Lubricant Additives-Soot Interactions on the Tribological Properties of Lithium Grease

IF 1.9 4区工程技术 Q3 ENGINEERING, CHEMICAL

Lubrication Science Pub Date : 2025-07-14 DOI:10.1002/ls.70000

Xing'an Cao, Haixiang Huan, Linzhen Zhou

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Abstract

Among atmospheric contaminants, soot is known to cause severe wear of mechanical components and degrade lubricating oils; however, its impact on lubricity grease remains largely unexplored. This study investigates the interactions between carbon black (as a soot surrogate) and other lubricant additives, including molybdenum disulfide (MoS₂) and anti-wear additive zinc dialkyldithiophosphate (ZDDP). Additionally, the effects of individual and combined additions of MoS₂ and ZDDP on the tribological properties of soot-contaminated lithium grease (LG) were compared. The lubricity of LG decreased progressively with increasing soot concentration. Conversely, incorporating MoS₂ improved the lubricity of LG, with optimal performance observed at 0.5 wt%. The individual addition of MoS₂ to LG minimally mitigated the abrasive wear caused by soot; however, the inclusion of ZDDP T202 enhances the effectiveness of MoS₂ in reducing the friction and wear. MoS₂ and ZDDP participate in tribochemical reactions to form protective films during sliding. MoS₂ contributes by reducing friction, while ZDDP reacts to form protective films that enhance wear resistance. However, the combined addition of ZDDP and MoS₂ demonstrates limited effectiveness in fully mitigating the adverse effects of soot on grease lubrication. Consequently, exploring more efficient methods to prevent lubrication failure caused by soot.

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润滑油添加剂-油烟相互作用对锂基润滑脂摩擦学性能的影响

在大气污染物中，已知煤烟会导致机械部件的严重磨损和润滑油的降解；然而，它对润滑脂的影响在很大程度上仍未被探索。本研究研究了炭黑（作为烟尘替代品）与其他润滑剂添加剂，包括二硫化钼（MoS2）和抗磨添加剂二烷基二硫代磷酸锌（ZDDP）之间的相互作用。此外，还比较了单独和联合添加MoS2和ZDDP对烟灰污染锂脂（LG）摩擦学性能的影响。随着烟灰浓度的增加，LG的润滑性逐渐降低。相反，加入MoS2可以改善LG的润滑性，在0.5 wt%时达到最佳性能。在LG中单独添加二硫化钼可以最大限度地减轻烟尘造成的磨料磨损；ZDDP T202的加入提高了MoS2的摩擦磨损效果。MoS2和ZDDP参与摩擦化学反应，在滑动过程中形成保护膜。MoS2有助于减少摩擦，而ZDDP反应形成保护膜，增强耐磨性。然而，ZDDP和MoS2的联合添加在完全减轻煤烟对油脂润滑的不利影响方面的效果有限。因此，探索更有效的方法来防止油烟引起的润滑失效。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Lubrication Science ENGINEERING, CHEMICAL-ENGINEERING, MECHANICAL

CiteScore

3.60

自引率

10.50%

发文量

审稿时长

6.8 months

期刊介绍： Lubrication Science is devoted to high-quality research which notably advances fundamental and applied aspects of the science and technology related to lubrication. It publishes research articles, short communications and reviews which demonstrate novelty and cutting edge science in the field, aiming to become a key specialised venue for communicating advances in lubrication research and development. Lubrication is a diverse discipline ranging from lubrication concepts in industrial and automotive engineering, solid-state and gas lubrication, micro & nanolubrication phenomena, to lubrication in biological systems. To investigate these areas the scope of the journal encourages fundamental and application-based studies on: Synthesis, chemistry and the broader development of high-performing and environmentally adapted lubricants and additives. State of the art analytical tools and characterisation of lubricants, lubricated surfaces and interfaces. Solid lubricants, self-lubricating coatings and composites, lubricating nanoparticles. Gas lubrication. Extreme-conditions lubrication. Green-lubrication technology and lubricants. Tribochemistry and tribocorrosion of environment- and lubricant-interface interactions. Modelling of lubrication mechanisms and interface phenomena on different scales: from atomic and molecular to mezzo and structural. Modelling hydrodynamic and thin film lubrication. All lubrication related aspects of nanotribology. Surface-lubricant interface interactions and phenomena: wetting, adhesion and adsorption. Bio-lubrication, bio-lubricants and lubricated biological systems. Other novel and cutting-edge aspects of lubrication in all lubrication regimes.