基于表面微结构的陶瓷/金属精密钎焊连接机理研究

According to the requirements for the precision joining of ceramic to metal, this project puts forward a new method to control the wetting behavior of solder during the brazing using surface microstructures obtained by laser fine processing technology. Based on the deep analysis to the influence mechanism of surface microstructures on wetting behavior of solder, the controlling mechanism of brazing zone boundaries by surface microstructures will be investigated and obtained. In this project, the control for the wetting behavior of solder will serve as the breakthrough point. Moreover, the theoretical design guideline for surface microstructures will be established and improved, and the influence mechanism of surface microstructures on the wetting behavior of solder will be revealed by investigating the influence of interfacial chemical reaction and physical contact on wetting behavior, especially the wetting behavior of solder on the smooth substrate surface and microstructure surface. The preliminary design of solder system will be carried out based on the requirement of interfacial microstructure, and then the residual stress of joints will be simulated by finite element method. According to the simulated results, the optimization of solder system as well as the determination of brazing parameters will be carried out. Finally, the precision joint of ceramic to metal will be achieved by vacuum brazing method, and the microstructure evolution of joint will be clarified, the controlling factors of precision brazing will be determined in order to reveal the joining mechanism of ceramic to metal. The project aims to develop a new precision joining method used in dissimilar materials, and also provides technical reserves for the joining of ceramic and metal. Additionally, the research will promote the application of surface microstructures in the field of brazing, which will cause the development of the precision brazing technology.

本项目针对异种材料之间精密连接的需要，提出了一种基于表面激光精细加工技术控制钎料润湿铺展行为的新方法，深入分析表面微结构对钎料润湿行为的影响规律，研究微结构控制接头钎焊区及边界的机理。本项目以钎料润湿行为的控制和界面反应为研究切入点，重点研究表面微结构对钎料设计及润湿行为的影响，建立钎料在微结构表面的润湿模型，揭示表面微结构对接头组织及性能的影响规律。采用有限元方法对接头残余应力进行数值模拟，基于组织需要及应力分析结果实现钎料体系的优化和钎焊参数的确定，阐明接头界面组织演化规律，揭示表面微结构及界面反应产物对接头性能的影响规律，确定精密钎焊连接的控制因素，实现异种材料的精密钎焊连接。本项目旨在开发异种材料的精密连接新方法，为异种材料的精密连接提供技术储备，同时推广表面微结构在钎焊领域的应用，促进精密钎焊连接技术的发展。

本项目针对异种材料之间精密连接的需要，提出了一种基于表面激光精细加工技术控制钎料润湿铺展行为的新方法，深入分析了表面微结构对钎料润湿行为的影响规律，研究了微结构控制接头钎焊区及边界的机理。本项目以钎料润湿行为的控制和界面反应为研究切入点，重点研究了表面微结构对钎料设计及润湿行为的影响，建立了钎料在微结构表面的润湿模型，揭示了表面微结构对接头组织及性能的影响规律。采用有限元方法对接头残余应力进行了数值模拟，基于组织需要及应力分析结果实现了钎料体系的优化和钎焊参数的确定，阐明了接头界面组织演化规律，揭示了表面微结构及界面反应产物对接头性能的影响规律，确定了精密钎焊连接的控制因素，实现了异种材料的精密钎焊连接。本项目旨在开发异种材料的精密连接新方法，为异种材料的精密连接提供技术储备，同时推广表面微结构在钎焊领域的应用，促进精密钎焊连接技术的发展。