A method for surface activation assisted brazing of SiO2 ceramic matrix composites

Abstract

The invention provides a method for assisting braze welding through activation of the surface of a SiO2 ceramic matrix composite material. According to the method, uniform glucose micromolecule particles are attached to the surface of the SiO2 ceramic matrix composite material; by means of plasma treatment, the surface of the SiO2 ceramic matrix composite material is covered with a thin carbon layer; and treated materials are sequentially overlapped according to the sequence of the SiO2 ceramic matrix composite material and a metal material, and then brazing filler metal is arranged between faces to be welded and placed into a vacuum brazing welding furnace to be heated. By means of the method, the strength of a connector can be improved remarkably, residual stress caused by the difference between thermal expansion coefficients between the SiO2 ceramic matrix composite material and the metal material can be effectively reduced, and finally high-quality connection between ceramic and metal is achieved.

Description

technical field [0001] The present invention relates to SiO 2 Brazing method of ceramic matrix composite material and metal material. Background technique [0002] Due to the increasingly harsh service conditions of materials in the aerospace field, higher and higher requirements are placed on advanced materials used in this field. SiO 2 Ceramic matrix composites have attracted more and more attention due to their light weight, good high temperature resistance and excellent mechanical properties. As a key protective and electrical component, SiO 2 Ceramic matrix composites have been widely used in the radomes of aerospace vehicles. SiO 2 Ceramic matrix composites have poor formability and are difficult to make large-sized or complex components. Therefore, in their assembly and use as radome materials, they need to be effectively connected to metal materials at their ends to obtain finished components. [0003] At present, the common methods of ceramic-metal connection ...

AI Technical Summary

Problems solved by technology

However, due to SiO 2 The wettability of the surface of ceramic matrix composites to active solder is extremely poor, and it is difficult to achieve high-quality connections or even effective connections of composite components

In addition, the vacuum brazing method was used to join the SiO 2 Ceramic matrix composites - metal components, due to SiO 2 The thermal expansion coefficients of ceramic matrix composites and metal materials do not match, so the joints will form a large residual stress during the brazing process, which seriously affects the mechanical properties of the joints

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