碳硅化钛/铝基自润滑复合材料界面调控及摩擦学性能研究

项目名称： 碳硅化钛/铝基自润滑复合材料界面调控及摩擦学性能研究

项目编号： No.51461017

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 张建波

作者单位： 江西理工大学

项目金额： 48万元

中文摘要： 润湿性良好的固体润滑剂和界面反应的有效控制是研制高性能金属基自润滑复合材料的关键。本项目以碳硅化钛为润滑组元，以铝硅合金为基体，开展碳硅化钛/铝基自润滑复合材料方面的研究，碳硅化钛与金属物理性质和化学键特性相近，有望形成理想界面，铝硅合金中的硅溶质原子有抑制碳硅化钛中硅原子溶出的作用，为有效控制界面反应提供了条件。首先通过理论和实验研究，揭示影响润湿性和界面反应的关键因素及作用机理，然后通过浸渗法和半固态法制备高、低碳硅化钛含量的复合材料，阐明碳硅化钛的卷入、分散和润湿过程，其次利用热模拟、有限元模拟和挤压拉拔研究变形行为，阐明强化机理，建立强化模型，最后通过磨损表面、磨损产物的组织成分分析研究摩擦学行为，揭示自润滑膜的作用机理，建立摩擦模型，最终实现力学和润滑性能的良好匹配。项目对开发MAX/金属基复合材料规模化生产技术具有实际指导意义，对发展高性能金属基自润滑复合材料具有重要科学价值。

中文关键词： 界面反应；自润滑材料；铝基复合材料；摩擦学性能；碳硅化钛

英文摘要： It is crucial to develop solid lubricants with good wettability and preparation methods effectively controlling interfacial reactions for the preparation of metal matrix self-lubricating composites with excellent performance. This project takes titanium silicon carbide as the solid lubricant, takes Al-Si alloy as the metal matrix, and conduct research on the titanium silicon carbide/aluminum matrix self-lubricating composites. The physical property and chemical bond of titanium silicon carbide is similar with that of metals, which lead to the expection of ideal interface formation. The pre-existing silicon solute atoms in Al-Si alloys can suppress the silicon atoms dissolving out from titanium silicon carbide, providing convenience for the effective control of the interfacial reaction. Firstly, theoretical and experimental research is carried out to reveal the key factors and the action mechanisms influencing wetting process and interfacial reaction. Secondly, the vacuum infiltration and semi-solid stirring method is applied to prepare titanium silicon carbide/Al-Si self-lubricating composites with high and low content of titanium silicon carbide. The involving, dispersing and wetting process of titanium silicon carbide into Al-Si melt is subsequently revealed. Thirdly, the deformation behavior is investigated by thermal simulation, finite-element simulation, extrusion and drawing to reveal the strengthening mechanism and build the strengthening model. At last, the tribology behavior is investigated by microstructure and composition analysis of the wearing surface and the friction product. The self-lubricating film formation and action mechanism is subsequently revealed and the friction model is built as well. The fair matching of mechanical and lubrication properties is finally achieved. This project has practical guiding significance for the production of MAX/metal matrix composites in large scale, and profound scientific value for the development of the composites with excellent performance.

英文关键词： Interface reaction;Self-lubricating material;Aluminum matrix composite;Tribological performance;Titanium silicon carbide