Connection method of Si3N4 ceramics and titanium alloy

Abstract

The invention belongs to the technical field of welding, and relates to connection of a dissimilar material, in particular to a connection method of Si3N4 ceramics and titanium alloy. The method comprises the step of: connecting an industrial-grade solder and a pure metal intermediate layer in vacuum, wherein the industrial-grade solder is an amorphous Ti40Zr25Cu20Ni15 solder with the thickness of 30-45 mu m, and the pure metal intermediate layer is Ni foil with the thickness of 100-250 mu m. According to the invention, the residual stress of the joint between the ceramics and the titanium alloy can be reduced and the strength of the joint is improved.

Description

technical field

[0001] The invention belongs to the field of welding technology and relates to the connection of dissimilar materials. 3 N 4 The joining method of ceramic and titanium alloy. Background technique

[0002] Structural ceramic materials have unique properties such as high strength, high temperature resistance, and corrosion resistance, but their shortcomings such as high brittleness, scattered strength, and difficult processing limit their application as an integral mechanism in engineering. Realizing the connection between structural ceramics and metals is of great significance to expand the application fields of ceramics.

[0003] The connection between ceramics and metals is mainly active brazing and diffusion welding, in addition to some new methods such as instantaneous liquid phase connection and secondary PTLP. Due to the large difference in the physical and chemical properties of ceramics and metals, especially the large difference in thermal expansio...