铜纳米颗粒改善润滑摩擦特性的机理研究
Study on the Key Mechanisms of Lubrication and Friction Property Improvement by Copper Nanoparticle Characteristics
DOI: 10.12677/ms.2025.154075, PDF,   
作者: 蔡志鹏, 邓 涛, 王洪云, 武锡荣, 唐纯挺：云南滇能智慧能源有限公司，云南 昆明；云南滇能电力工程有限公司，云南 昆明
关键词: 纳米颗粒；凸峰；分子动力学；摩擦特性；Nanoparticles； Asperity； Molecular Dynamics； Tribology Properties
摘要: 铜纳米流体作为润滑剂可以有效降低摩擦系数，改善摩擦副的形貌，然而目前对其改善润滑摩擦的物理机制尚不清晰。本文采用分子动力学方法详细分析了凸峰剪切过程中，铜纳米颗粒对摩擦副塑性变形、应力分布、摩擦力变化、以及摩擦副温度分布的影响规律，得到了纳米铜颗粒改善润滑摩擦的物理机制。研究结果表明铜纳米颗粒受到凸峰的剪切作用形成了固体润滑膜，阻碍了凸峰直接接触，显著降低了黏着磨损，有效地改善了摩擦副的应力分布，显著降低了摩擦力和摩擦副的温度，从而实现了抗磨减摩效果。
Abstract: The mechanisms responsible for nanoparticles’ antiwear and friction reduction properties are still not well known. Nanoparticles’ improved effect on the rough surfaces contact is an important reason for the antiwear and friction reduction properties. The asperity shear is a typical way of rough surfaces contact. We performed molecular dynamics simulations to study the effect of copper (Cu) nanoparticles on the tribology properties of asperity shear. The friction pair is consisted by two iron plates with asperities. The processes of asperity shear were given in detail. Because of the extrusion by the two asperities, the spherical Cu nanoparticle was transformed into a solid lubricating film, preventing the direct contact between the two asperities. Compared with the base fluid system, the stress distribution and surface wear of the nanofluid system were improved. During solid contact, the temperature of metal contact region and the friction force of the nanofluid system were lower than that of the base fluid system. Additionally, the height of the nanofluid system was increased by the presence of Cu nanoparticle, which helps to reduce the indentation depth of asperity and the probability of asperity contact.
文章引用：蔡志鹏, 邓涛, 王洪云, 武锡荣, 唐纯挺. 铜纳米颗粒改善润滑摩擦特性的机理研究[J]. 材料科学, 2025, 15(4): 705-715. https://doi.org/10.12677/ms.2025.154075

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