Modelling Friction Reduction Based on Molybdenum Disulphide Tribofilm Formation and Removal in Boundary Lubrication

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2025-03-17 DOI:10.1007/s11249-025-01981-6

Dichu Xu, Cayetano Espejo, Chun Wang, Ardian Morina

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Abstract

Molybdenum dialkyldithiocarbamate is a highly effective friction modifier lubricant additive in boundary lubrication, owing to the formation of a MoS₂ nanosheet lattice structure that significantly reduces friction. The friction reduction behaviour is linked to the MoS₂ amount and coverage buildup at the contacting interface, however, accurately predicting friction reduction based on a semi-deterministic model incorporating MoS₂ formation and removal remains challenging. In this study, a Raman map collection methodology was developed for accurate quantitative analysis of MoS₂ tribofilms. The growth rate of MoS₂ tribofilms was determined by coupling tribochemical experimental data with sophisticated numerical models. A full numerical procedure was implemented under rubbing of two rough surfaces at different temperatures. The results demonstrated localised MoS₂ tribofilms buildup. The friction coefficients show a close agreement with the measurements. The developed model can be adapted to diverse experimental setups and surface geometries.

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基于边界润滑中二硫化钼摩擦膜形成和去除的摩擦减少建模

二烷基二硫代氨基甲酸钼是一种非常有效的摩擦改性润滑剂添加剂，由于其形成的二硫化钼纳米片晶格结构显著降低了摩擦。摩擦减少行为与MoS2的数量和接触界面上的覆盖面积有关，然而，基于包含MoS2形成和去除的半确定性模型准确预测摩擦减少仍然具有挑战性。在这项研究中，开发了一种拉曼图收集方法，用于精确定量分析二硫化钼摩擦膜。通过摩擦化学实验数据与复杂的数值模型相结合，确定了二硫化钼摩擦膜的生长速率。对两个粗糙表面在不同温度下的摩擦进行了完整的数值模拟。结果表明，MoS2摩擦膜局部形成。摩擦系数与测量值吻合较好。所开发的模型可以适应不同的实验设置和表面几何形状。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.