A composite intermediate layer and its method for brazing metal, ceramics and ceramic-based composite materials

Abstract

The invention relates to a composite interlayer and a method for brazing metal with a ceramic and ceramic matrix composite material by utilizing the same, and solves a difficult problem of poor connector performance caused by a large amount of brittle phases generated in a strong reaction of a connector interface during brazing of the metal and the ceramic and ceramic matrix composite material by adopting an active brazing material and large residual stress of the connector after welding. The composite interlayer comprises an upper-layer brazing material, a soft interlayer and a lower-layer brazing material. The method comprises the following steps: 1, brazing material preparation, wherein the brazing material is prepared at a certain ratio; 2, cleaning, wherein cleaning is performed by acetone; 3, assembling, wherein a to-be-welded base material and the composite interlayer are assembled according to a certain sequence; 4, welding, wherein welding is performed in a vacuum brazing furnace. The operation is simple, and the addition of the interlayer inhibits over-reaction of the brazing material and the base material, reduces residual stress of the connector, and greatly improves the connector performance. The method is used for brazing the metal with the ceramic and ceramic matrix composite material.

Description

technical field [0001] The invention relates to a composite middle layer and a method for brazing metal, ceramics and ceramic matrix composite materials thereof. Background technique [0002] Ceramics and ceramic-based composites have excellent high-temperature properties such as high melting point, high strength, ablation resistance, and good thermal fatigue. They are important high-temperature structural materials in the aerospace field. Due to the intrinsic brittleness of ceramic materials and the limitations of preparation technology, It is difficult to obtain large-sized and complex-shaped ceramic components, so realizing its reliable connection with metal materials is the key to its wide application. GH99, TC4, and Invar alloys are widely used in the aerospace field. In practical applications, it is often necessary to realize the connection between ceramics and ceramic composite materials and the above alloys. [0003] At present, a large number of studies have shown ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor performance of the joint caused by the violent reaction of the joint interface to generate a large number of brittle phases and the large residual stress of the joint after welding when the active solder is used to directly braze metal, ceramics and ceramic matrix composite materials

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