Influence of ionic liquid/liquid metals on the lubrication properties of lithium grease

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Industrial Lubrication and Tribology Pub Date : 2024-06-03 DOI:10.1108/ilt-01-2024-0017

Maosheng Wen, En Zhu Hu, Xingpeng Fei, Kunhong Hu

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引用次数: 0

Abstract

Purpose

This paper aims to use an ionic liquid (IL, [HMIM]PF₆) to improve the lubrication performance of liquid metal (LM) as a lithium grease additive and to expand the application range of LM.

Design/methodology/approach

In this paper, the different mass ratios of [HMIM]PF₆/LM mixtures were added into the lithium grease on a four-ball tribo-meter to investigate the effects of its tribological behavior. Scanning electron mircoscope/energy dispersive spectroscopy and X-ray photoelectron spectroscopy were used to reveal the anti-wear and friction-reducing mechanism of the additives.

Findings

When the load was used at 461 N, the average coefficient of friction (ACOF) and average wear scar diameter (AWSD) of steel ball Lubricated with grease with an optimal ratio of 2:3 ([HMIM]PF₆/LM) were reduced by 32.8% and 30.5%, respectively. Friction and wear mechanisms are ascribed to friction-induced additive components that can simultaneously form a composite lubrication film consisting of FePO₄, FeF₃, Ga₂O₃, In₂O₃ and SnO₂.

Research limitations/implications

Compared with the pure lithium-based grease, when [HMIM]PF₆/LM was added with an optimal ratio of 2:3, the ACOF and AWSD were reduced by 12.4% from 0.097 to 0.085 and 23.8% from 552.117 µm to 420.590 µm under 392 N, respectively. When at 461 N, the ACOF and AWSD of steel ball were reduced by 32.8% from 0.122 to 0.082 and 30.5% from 715.714 µm to 497.472 µm, respectively. It was shown that the simultaneous addition of LM and [HMIM]PF₆ can form a composite lubrication film consisting of FePO₄, FeF₃, Ga₂O₃, In₂O₃ and SnO₂.

Originality/value

In this paper, [HMIM]P F₆ is added with LM simultaneously to improve the lubrication properties of lithium grease, and expand the application scope of LM.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2024-0017/

查看原文本刊更多论文

离子液体/液态金属对锂基润滑脂润滑特性的影响

设计/方法/途径本文将不同质量比的[HMIM]PF6/LM混合物添加到四球摩擦仪上的锂基润滑脂中，研究其摩擦学行为的影响。结果当负载为 461 N 时，使用最佳比例为 2:3 的润滑脂（[HMIM]PF6/LM）润滑的钢球的平均摩擦系数（ACOF）和平均磨痕直径（AWSD）分别降低了 32.8%和 30.5%。摩擦和磨损机制归因于摩擦诱导添加剂成分，这些成分可同时形成由 FePO4、FeF3、Ga2O3、In2O3 和 SnO2 组成的复合润滑膜。研究局限性/意义与纯锂基润滑脂相比，当以 2:3 的最佳比例添加 [HMIM]PF6/LM 时，在 392 N 条件下，ACOF 和 AWSD 分别从 0.097 微米降至 0.085 微米，降低了 12.4%；从 552.117 微米降至 420.590 微米，降低了 23.8%。在 461 N 条件下，钢球的 ACOF 和 AWSD 分别从 0.122 到 0.082 降低了 32.8%，从 715.714 µm 到 497.472 µm 降低了 30.5%。研究表明，同时添加锂基润滑脂和[HMIM]PF6 可以形成由 FePO4、FeF3、Ga2O3、In2O3 和 SnO2 组成的复合润滑膜。

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来源期刊

Industrial Lubrication and Tribology 工程技术-工程：机械

CiteScore

3.00

自引率

18.80%

发文量

129

审稿时长

1.9 months

期刊介绍： Industrial Lubrication and Tribology provides a broad coverage of the materials and techniques employed in tribology. It contains a firm technical news element which brings together and promotes best practice in the three disciplines of tribology, which comprise lubrication, wear and friction. ILT also follows the progress of research into advanced lubricants, bearings, seals, gears and related machinery parts, as well as materials selection. A double-blind peer review process involving the editor and other subject experts ensures the content''s validity and relevance.