Diffusion welding method for TA2 material micro-channel radiator

Abstract

The invention discloses a diffusion welding method for a TA2 material micro-channel radiator. The diffusion welding method comprises the following steps: carrying out etching processing on an annealed-state high-precision plate with a roughness of less than Ra0.4; assembling a plurality of stacked micro-channel etching plates and side plates into a micro-channel core body, and then assembling the micro-channel core body on a positioning rod; placing a layer of graphite paper on each of the uppermost layer and the lowermost layer of the assembled micro-channel core body; ensuring that the center of the core body is consistent with the center of a pressurization mechanism of diffusion welding equipment; when the vacuum degree reaches 6*10<-3> Pa, starting heating; pre-pressing a pressing force of 0.5 MPa on the micro-channel core body; when the temperature reaches 890 + / -5 DEG C, adjusting the pressing force to 3.5 Mpa, and carrying out heat preservation for 180 min at the temperature; after heat preservation is finished, keeping the pressing force of 3.5 Mpa for cooling; and when the temperature of the core body is cooled to 400 DEG C, starting an argon filling cooling mode. According to the invention, the problem of diffusion welding when a TA2 titanium alloy micro-channel radiator comprises hundreds of layers of micro-channel plates is solved.

Description

technical field [0001] The invention relates to the technical field of titanium alloy diffusion welding, in particular to a diffusion welding method for a TA2 material microchannel radiator. Background technique [0002] With the development of light weight and high performance of aircraft, the commonly used tube-and-tube and plate-fin radiators can no longer meet the requirements of small volume and high heat dissipation. Equal radiators, small size and high radiator efficiency, are the mainstream development direction of radiators in the future. [0003] The processing method of micro-channel radiators is mainly diffusion welding, which has the advantages of small welding deformation, no excess, and high joint strength; diffusion welding can replace vacuum brazing, dipping brazing and other welding methods, and is the main method for future micro radiators. processing technology. However, at present, the diffusion welding of microchannel heat sinks made of TA2 materials ...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention aims to provide a method for diffusion welding of TA2 material microchannel heat sinks, which solves the cumulative deformation and assembly difficulties that exist during the diffusion welding of TA2 titanium alloy microchannel heat sinks comprising hundreds of layers of microchannel plates. , large assembly tolerances and low pass rate after welding

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