Connection method for tin bronze and alumina ceramic and prepared connecting piece

Abstract

The invention provides a connection method for tin bronze and alumina ceramic. According to the connection method, discharge plasma sintering equipment is mainly used for applying a pulse current on tin bronze, alumina ceramic and a metal interface layer to realize discharge plasma connection; a connecting die is designed to have different sectional areas perpendicular to the direction of the current at an upper part and a lower part; an alumina ceramic member with a high melting point is located at the upper part, a tin bronze member with a low melting point is located at the lower part, and a current applied on the alumina ceramic member is greater than a current applied on the tin bronze member, thereby enabling the two members to be simultaneously softened for connection. The invention also provides a connecting piece for tin bronze and alumina ceramic prepared by the above-mentioned connection method.

Description

technical field [0001] The invention relates to a connection method of metal and ceramics and a prepared connection piece, in particular to a connection method of tin bronze and alumina ceramics and the prepared connection piece. Background technique [0002] Since tin bronze and alumina ceramics have huge differences in crystal structure, thermal expansion coefficient, melting point, etc., the connection between the two is very difficult. The connection methods that may be used at present include brazing, solid-phase diffusion connection and instantaneous liquid-phase diffusion connection, but these methods have many shortcomings: the connection temperature of brazing is usually low, but because the melting point of solder is generally low, so brazing It is difficult to make a joint that can be used at high temperature; for solid phase diffusion connection, a high temperature is required to realize the connection with ceramics, and the holding time at the connection tempera...

AI Technical Summary

Problems solved by technology

[0002] Due to the huge difference in crystal structure, thermal expansion coefficient, melting point, etc. between tin bronze and alumina ceramics, the connection between the two is very difficult

The connection methods that may be used at present include brazing, solid-phase diffusion connection and instantaneous liquid-phase diffusion connection, but these methods have many shortcomings: the connection temperature of brazing is usually low, but because the melting point of solder is generally low, so brazing It is difficult to make a joint that can be used at high temperature; for solid phase diffusion connection, a high temperature is required to realize the connection with ceramics, and the holding time at the connection temperature is often longer than 1 hour, the processing time is long, and the energy consumption is large; use The instantaneous liquid phase diffusion connection method to realize the connection between tin bronze and alumina ceramics must make both of them appear in liquid phase. Due to the influence of differences in melting point and diffusion performance between tin bronze and alumina ceramics, it is necessary to extend the liquid phase. Time, and the connection time is too long, it is easy to melt the tin bronze too much and overflow to the outside of the joint, affecting the quality of the joint

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