电接触条件下纳米润滑膜界面导电行为及磨蚀破坏机制研究

项目名称： 电接触条件下纳米润滑膜界面导电行为及磨蚀破坏机制研究

项目编号： No.51475256

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 解国新

作者单位： 清华大学

项目金额： 85万元

中文摘要： 随着现代电接触应用不断向高效率、微型化和集成化等方向发展，其接触界面要求的高导电性和有效润滑难以同时满足、材料磨损和腐蚀使系统可靠性降低、服役寿命缩短等问题日益突出。由于电接触受限间隙常处于纳米量级，润滑界面电流传导和材料退化失效过程错综复杂，分析难度大，国内外研究者对相关过程的规律和机理研究尚不充分。鉴于此，本项目主要利用自制设备，研究电接触纳米级润滑膜界面的润滑和导电性能、稳定性以及磨损和腐蚀破坏规律；从微纳尺度明确电接触界面润滑和导电性能与接触副材料物理力学特性、润滑状态、润滑剂分布和流动等因素的内在联系；阐明电接触条件下磨损、腐蚀及界面失稳诱导纳米级润滑膜界面性能演变和退化机制。在摩擦学、电介质物理学、材料学和腐蚀电化学等学科交叉的基础上，构建电接触纳米级润滑膜界面磨蚀退化和失效理论模型，为新型电接触系统材料开发设计、制造和优化提供理论支持。

中文关键词： 纳米摩擦学；电接触；摩擦磨损机理；导电性能；纳米薄膜

英文摘要： With the development of modern electrical contact applications towards the directions of high efficiency, minimization and integration, et al, the compromise problem between required high electrical conductivity and effective lubrication, as well as the decreases of interface reliability and service life of electrical contact systems affected by wear and corrosion of materials become increasingly prominent. Since the confined gap of the electrical contact interface is usually at the nanoscale, the processes of current conduction through lubricated interfaces, as well as the degradation and failure of materials are very complicated and difficult to analyze.Investigations on revealing the behaviors and underlying mechanisms of the relevant processes conducted by researchers are still inadequate. Towards solving these problems, the present project will carry out investigations mostly based on self-made techniques to reveal the behaviors of the lubrication, electrical conduction and stability properties, as well as damages due to wear and corrosion of the electrical contact interfaces with nanoscale lubricant films. The inherent relationships between the lubrication and conduction properties of the lubricant film, and influencing factors, such as the physical and mechanical properties of contacting pair materials, lubrication states, lubricant distribution and flow in the contact region, will be made clear at the micro/nano scales. The evolution and degradation mechanisms of the electrical contact interfaces with nanoscale lubricant films due to wear, corrosion and interfacial destabilization will be understood. Based on cross-disciplines of tribology, dielectric physics, material, corrosion and electrochemistry, theoretical models of the degradation and failure of the electrical contact interfaces with nanoscale lubricant films due to wear and corrosion will be constructed. Thereby, theoretical supports will be provided for the design, manufacture and optimization of novel electrical contact systems and materials.

英文关键词： nanotribology;electrical contact;friction and wear mechanism;electrical conduction properties;nanoscale thin film