Process for soldering SiO2f/SiO2 composite ceramic and metal material

Abstract

The invention discloses a process for soldering a SiO2f/SiO2 composite ceramic and a metal material, which is characterized by selecting AgCu-Ti active solder to connect the SiO2f/SiO2 composite ceramic, and by comprising the following process steps: making grooves on the to-be-soldered surface of the SiO2f/SiO2 composite ceramic by a machining process; placing the active solder in the grooves on the to-be-soldered surface of the SiO2f/SiO2 composite ceramic and adding the AgCu-Ti solder on the to-be-soldered interface between the soldered SiO2f/SiO2 composite ceramic and the soldered metal material; and realizing the effective connection of the SiO2f/SiO2 composite ceramic and the metal material by vacuum soldering and heating.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a 2f / SiO 2 A process for brazing composite materials and metal materials. Background technique [0002] Quartz fiber reinforced quartz composite ceramics (SiO 2f / SiO 2 ) is a promising high-temperature structural ceramic matrix composite. However, due to the special requirements for the combination of performance in some engineering applications, it is necessary to form a composite structure with metal materials for application. [0003] SiO 2f / SiO 2 The connection of composite ceramics is generally suitable for brazing or diffusion welding methods, but direct SiO 2f / SiO 2 The bonding of composite ceramics to metals is very difficult because SiO 2f / SiO 2 The thermal expansion coefficients of composite ceramics and metals are very different (the former is about 0.3×10 -6 K -1 , the latter is generally about 5.5~15×10 -6 K -1 , that is, the difference is more than...

AI Technical Summary

Problems solved by technology

[0003] SiO 2f / SiO 2 The connection of composite ceramics is generally suitable for brazing or diffusion welding methods, but direct SiO 2f / SiO 2 The bonding of composite ceramics to metals is very difficult because SiO 2f / SiO 2 The thermal expansion coefficients of composite ceramics and metals are very different (the former is about 0.3×10 -6 K -1 , the latter is generally about 5.5~15×10 -6 K -1 , that is, the difference is more than ten times or even dozens of times), which leads to the formation of huge residual thermal stress in the joint during the cooling process after high-temperature brazing or diffusion welding, which will directly cause the joint to peel off from the connection interface and crack. SiO 2f / SiO 2 For the connection of composite ceramics and metal materials, it is necessary to adopt a suitable method in this field to relieve the huge residual thermal stress formed in the connection joint after brazing or diffusion welding

About SiO 2f / SiO 2 For the connection of composite ceramics and metal materials, there is currently no effective method to relieve the residual thermal stress of the joint after welding

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