Ti2AlC陶瓷与金属连接过程中陶瓷稳定性和钎焊机理研究

采用Ag、Al、Ag-Cu、Al-Si、Cu-Ti作为钎料，通过钎焊方法连接Ti2AlC陶瓷与金属（钛、铜、镍）。利用试验和理论计算的方法系统研究钎焊环境、钎料组元的构成及成分、被连接金属的种类、连接工艺参数对接头组织特征和Ti2AlC陶瓷结构稳定性的影响。分析陶瓷母材和接头中的微观组织演化与接头的力学性能、导电性能和抗氧化性能之间的关系。从理论上阐述Ti2AlC陶瓷中Al空缺的形成与Ag、Al、Cu、Si、Ti、Ni等不同金属元素之间的交互作用原理，探求既实现Ti2AlC陶瓷本身及其与金属的成功连接，又保持陶瓷母材的结构稳定性，并发挥其独特性能的途径，揭示钎焊连接机理。为指导Ti2AlC陶瓷与金属的连接工艺、钎料成分设计、接头微观组织优化、获得组织和性能稳定的Ti2AlC陶瓷与金属的接头奠定理论基础，并丰富Ti-Al-C陶瓷结构稳定性研究的基础理论。

Using Ag, Al, Ag-Cu, Al-Si and Cu-Ti alloys as filling materials, Ti2AlC and metals (Ti, Cu, Ni) are bonded by brazing technique. Effects of brazing environment, composition of the filling materials, types of bonded metal, braze bonding parameters on microstructure characteristic of the joint and phase stability of the Ti2AlC ceramic are investigated by means of experiments and theoretical calculation. Relationships between microstructure evolution of Ti2AlC ceramic and joint and mechanical properties, electric conductivity and oxidation resistance of the joint are analyzed. The formation of Al vacancy in the Ti2AlC ceramic and its interaction with Ag, Al, Cu, Si, Ti, Ni elements are discussed in theory. Based on the successful bonding btween Ti2AlC and metals, structure stability and typical properties of the Ti2AlC ceramic are kept, and braze bonding mechanism is studied. This research will provide the theoretical basis for the brazing technique btween Ti2AlC and metals, composition design of filling material, optimization of joint microstructure, obtaining the joint btweeen Ti2AlC and metals with high stability of structure and properties, and also contribute to the basic theory of structure stability of the Ti-Al-C ceramics.