Effect of the near-surface pore volume evolution on graphite migration of copper-based graphite composite during friction

IF 1.6 3区工程技术 Q3 ENGINEERING, MECHANICAL Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology Pub Date : 2023-09-11 DOI:10.1177/13506501231201202

Kun Chen, Xiaofei Wei, Qinglin Zhang

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Abstract

The discrete element method was used to simulate the friction process of copper-based graphite composite materials in order to analyze the influence of pore structure on the solid lubricants migration in metal-based self-lubricating materials. And the near-surface pore volume evolution was considered in the simulation. The simulation results showed that the graphite particle motion depth and the migration channel increased gradually and tended to stable during friction. The near-surface pore structure has an important influence on the graphite migration and the tribological properties of the composite: the larger the migration channel was, the greater the graphite migration speed was; with the increase in migration channel, the graphite average critical migration depth decreased first then increased, the number of the film-forming particles first increased and then decreased; the greater the migration channel volume was, the more worn particles number were. The numerical simulation was confirmed by experimental analysis on a self-made in-situ observation tribometer, the experimental results were consistent with the numerical simulation results.

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摩擦过程中近表面孔隙体积演化对铜基石墨复合材料石墨迁移的影响

采用离散元法模拟了铜基石墨复合材料的摩擦过程，分析了金属基自润滑材料中孔隙结构对固体润滑剂迁移的影响。模拟中考虑了近表面孔隙体积的演化。模拟结果表明，在摩擦过程中，石墨颗粒的运动深度和迁移通道逐渐增大，并趋于稳定。近表面孔隙结构对石墨的迁移和复合材料的摩擦学性能有重要影响:迁移通道越大，石墨的迁移速度越大;随着迁移通道的增加，石墨平均临界迁移深度先减小后增大，成膜颗粒数量先增加后减少;迁移通道体积越大，磨损颗粒数量越多。通过自制原位观测摩擦计的实验分析，验证了数值模拟的正确性，实验结果与数值模拟结果一致。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 工程技术-工程：机械

CiteScore

4.20

自引率

5.00%

发文量

110

审稿时长

6.1 months

期刊介绍： The Journal of Engineering Tribology publishes high-quality, peer-reviewed papers from academia and industry worldwide on the engineering science associated with tribology and its applications. "I am proud to say that I have been part of the tribology research community for almost 20 years. That community has always seemed to me to be highly active, progressive, and closely knit. The conferences are well attended and are characterised by a warmth and friendliness that transcends national boundaries. I see Part J as being an important part of that community, giving us an outlet to publish and promote our scholarly activities. I very much look forward to my term of office as editor of your Journal. I hope you will continue to submit papers, help out with reviewing, and most importantly to read and talk about the work you will find there." Professor Rob Dwyer-Joyce, Sheffield University, UK This journal is a member of the Committee on Publication Ethics (COPE).