Auxiliary brazing method for grapheme composite middle layer of three-dimensional structure

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.