双连续相PTFE/金属摩擦材料界面力-热协同效应调控机制

高性能金属基PTFE自润滑材料是高端装备用轴承自润滑材料的主要发展方向。双连续相PTFE/金属复合材料作为极具潜力的新型自润滑轴承材料，但其界面弱结合、高热阻问题是制约其应用的瓶颈。为此，本项目以双连续相PTFE/金属复合材料为研究对象，从PTFE聚合物与金属间的界面问题出发，采用金属-聚多巴胺（PDA）混合颗粒对双连续相PTFE/金属复合材料进行界面调控，揭示金属-PDA界面层协同强化界面结合和界面热导的机制；借助实验分析和模拟计算相结合的手段，构建双连续相PTFE/金属-PDA/金属复合材料的力学模型和热传导模型；并基于材料磨损特性、摩擦热和动态接触应力的分析，研究材料各组成相对磨损特性的影响机制，形成双连续相PTFE/金属磨损性能调控理论，为高性能金属基PTFE自润滑材料开发提供理论依据和技术支撑，也为该复合材料的长寿命、高可靠服役提供基础数据。

High performance PTFE-metal matrix self-lubricating materials are the main development directions of self-lubricating bearing for high-end equipment. The co-continuous PTFE/metal composites as a potential new self-lubricating bearing materials. However, the weak bonding and high thermal resistance at the interface between PTFE polymer and metal in co-continuous PTFE/metal composites is the bottleneck which restricting its applicaiton. Therefore, in this project, it takes the co-continuous PTFE/metal composites as the research object, starts from the interface problems between PTFE polymer and metal, chooses metal-polydopamine (PDA) mixed particles to regulate the interface in the co-continuous PTFE/metal composites. And, it revealed the synergistically strengthening mechanism of the interfacial bonding and thermal conductivity by the metal-PDA interface layer. By the means of experimental analysis and numerical simulation, the mechanical model and heat conduction model of the co-continuous PTFE/metal-PDA/metal composites are established. Also, based on the analysis of the wear characteristics, friction heat and dynamic contact stress, the influence mechanism of the composition phase on the wear characteristics is studied, the control theoretical of the wear properties for the co-continuous PTFE/metal composites is formed. The above research results will provide theoretical basis and technical support for the development of high-performance PTFE-metal matrix self-lubricating materials, and also provide basic data for the long life and high reliable service of the composites.