Copper alloy contact reaction brazing method and used active connecting agent

Abstract

The invention relates to a copper alloy contact reaction brazing method and a used active connecting agent. The active connecting agent comprises the following components in percentage by weight: 78-85 percent of red phosphorus powder, 5-12 percent of boron powder and 10 percent of a bonding agent. The copper alloy contact reaction brazing method comprises the following steps: (1) coating the joint surface of copper blocks to be welded with the active connecting agent; (2) combining the copper blocks to form a butt brazing joint, fixing and compressing on a welding fixture and putting into a vacuum chamber of a hot isothermal furnace; (3) applying the welding pressure of 0.085-0.02 MPa and pumping to a certain vacuum degree; (4) introducing high-purity argon gas with the purity of 99.999 percent, performing heating and heat preservation on a workpiece when the pressure intensity in the furnace is not lower than 4,357 KPa and completing brazing. As the active connecting agent provided by the invention is utilized for copper alloy contact reaction brazing, the copper alloy in-situ synthesis brazing joint is realized, and a solder flux is not required; the brazing temperature is low, so that the influence on base materials is less; the compactness of the brazing joint is high, and the shearing strength of the brazing joint achieves is 80 percent or above of the strength of the copper alloy base materials.

Description

technical field [0001] The invention relates to the technical field of copper alloy brazing materials, in particular to a contact reaction brazing method between copper alloys based on the principle of contact reaction and an active linking agent used. Background technique [0002] Copper and copper alloys have excellent electrical and thermal conductivity, and can be used for soldering and other welding. However, due to the high melting point and easy oxidation of copper and copper alloys, the welding of copper and copper alloys has the following technical difficulties: [0003] (1) The high melting point and high thermal conductivity make the welding temperature of copper and copper alloy very high. When the conventional welding process parameters are used, the copper is difficult to melt and cannot be well fused; During welding, the copper in the molten pool and the impurities in it form a low-melting eutectic, which makes copper and copper alloys have obvious hot embritt...

AI Technical Summary

Problems solved by technology

[0003] (1) The high melting point and high thermal conductivity make the welding temperature of copper and copper alloy very high. When the conventional welding process parameters are used, the copper is difficult to melt and cannot be well fused; During welding, the copper in the molten pool and the impurities in it form a low-melting eutectic, which makes copper and copper alloys have obvious hot embrittlement and hot cracks; (3) copper and copper alloy welding are prone to defects of pores, and are more prone to defects than carbon steel Much more serious, mainly hydrogen pores; (4) changes in welded joint performance, grain coarsening, plasticity decline, corrosion resistance decline, etc.

At present, the welding of copper and copper alloys mainly adopts gas welding, inert gas shielded welding, submerged arc welding, brazing and other methods, but the welding temperature of these welding methods needs to reach the melting point temperature of copper and copper alloys. At high temperatures, copper will soften. , affecting the mechanical properties and mechanical properties of copper and copper alloys

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