Three-dimensional structure graphene composite intermediate layer assisted brazing method

Abstract

The invention relates to the field of material welding, in particular to an auxiliary brazing method for a grapheme composite middle layer of a three-dimensional structure. The problem that in the existing brazing process, a connector is prone to generating large residual stress to lead to the poor mechanical property of the brazing connector is solved. The method includes the steps that impurities on the surface of foam metal are removed, the foam metal is placed in a chemical vapor deposition device, argon is injected into the device, the gas flow and pressure are adjusted, then temperature is made to rise, methane is injected, the gas flow and pressure are adjusted to carry out deposition, and the grapheme composite middle layer of the three-dimensional structure is obtained after deposition is completed; the grapheme composite middle layer of the three-dimensional structure is placed between two materials to be welded, brazing filler metal is placed between faces to be welded, the combination is placed in a vacuum brazing furnace, the vacuum brazing furnace is vacuumized, the heat is preserved at high temperature, and then the vacuum brazing furnace is cooled to complete the auxiliary brazing process of the grapheme composite middle layer of the three-dimensional structure. The method is used for auxiliary brazing for the grapheme composite middle layer of the three-dimensional structure.

Description

technical field [0001] The invention relates to the field of material welding. Background technique [0002] The following two major problems are mainly faced in the brazing process of materials. First of all, there is a large difference in thermal expansion coefficient between materials, and the joints are prone to generate large residual stress during the brazing process. Residual stress will seriously weaken the mechanical properties of joints, and even cause damage to already connected joints. At present, the residual stress of the joint can be relieved and the performance of the brazed joint can be improved by optimizing the solder and adjusting the structure of the brazing intermediate layer. Secondly, the wetting of the surface of different materials and solder is quite different, resulting in problems such as insufficient interfacial reaction and discontinuous reaction layer, which will have a serious impact on the performance of the joint. Graphene, usually refer...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of poor mechanical properties of brazed joints due to the fact that the joints are prone to produce large residual stresses during the existing brazing process, and provides a method for assisting brazing with a three-dimensional graphene composite intermediate layer

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