微织构—石墨烯复合表面调控滑动电接触界面摩擦磨损行为的机理研究

滑动电子连接器广泛应用在航空航天、核电和自动化等领域，其界面的磨损问题严重制约连接器和电子系统的可靠性，因此降低电接触界面磨损是维系电子系统安全稳定运行的关键。本项目基于表面织构改善磨损、二次润滑与石墨烯减摩、润滑导电一体化的功能特性，构筑微织构—石墨烯复合表面，利用二者在界面导电持续性与减摩抗磨的互补优势，实现对电接触界面磨损行为的协同调控。通过试验研究该复合表面在不同工况下摩擦学行为的演变规律与磨损机制，进而建立机—电—热多场耦合有限元模型；利用改进Archard磨损公式，实现复合表面从微观接触特性到宏观磨损量、电压、温度等物理量的跨尺度求解。综合试验与数值模拟结果，探明影响电接触界面磨损行为的关键因素，并建立复合表面—关键因素—摩擦磨损三者之间的动态关系，最终揭示微织构—石墨烯复合表面对滑动电接触界面摩擦磨损行为的调控机理。预期成果可为滑动电接触界面的减摩抗磨设计提供重要的理论依据。

Sliding electrical connectors are widely used in aerospace, nuclear power, automation and other fields. The wear of the electrical contact surface seriously restricts the reliability of connectors and electronic systems. Therefore, reducing the wear of electrical contact surface is the key to maintain the safe and stable operation of electronic systems. In this project, micro-texture-graphene composite surface is constructed, by combining the ability of surface texture in wear reduction and secondary lubrication, as well the functional characteristics of graphene in integrating lubrication and conductivity. The aim of this project is to synergistically control the wear behavior of electrical contact surface by using this composite surface. Firstly, the tribological evolution law and wear mechanism of contact surface under different sliding electrical contact conditions are explored experimentally, and then the mechanical-electric-thermal multi-field coupling finite element model is established. By using the improved Archard wear formula, the cross-scale solution of the composite surface from the microscopic contact characteristics to the macroscopic wear quantity, voltage, temperature and other physical parameters is realized. Based on the experimental and numerical simulation results, the key factors which may affect the wear behavior of the electrical contact surface are identified, and the dynamic relationship among the composite surface, the key factors and the friction and wear is established. Finally, the regulation mechanism of the micro-texture-graphene composite surface on the friction and wear behavior of the sliding electrical contact surface is revealed. The expected results can provide an important theoretical basis for the surface design of sliding electrical connectors in reducing friction and wear.