Scraping, vibrating and soldering method for preparing foamed aluminum sandwich structure

Abstract

The invention aims to provide a scraping, vibrating and soldering method for preparing a foamed aluminum sandwich structure, which adopts a wire brush to scrape so that oxide films on the surfaces of aluminum plates and a foamed aluminum plate are broken, pure aluminum surfaces are exposed, and a brazing material can be fully fused into aluminum and can be fully contacted and reacted with an aluminum parent metal to form a good reaction binding layer. The invention achieves the aims as follows: the scraping, vibrating and soldering method for preparing the foamed aluminum sandwich structure comprises the following four steps: cleaning, drying and heating the foamed aluminum plate and two aluminum plates; scraping the brazing material coating surfaces of the aluminum plates by adopting the wire brush; removing the redundant brazing material floating on two surfaces of the aluminum plates and the foamed aluminum plate; and compounding two brazing material coating surfaces of the aluminum plates and the brazing material coating surface of the foamed aluminum plate. The method gives full play to the advantage of foamed aluminum with lightweight, and has special significance in the aerospace field and the like sensitive to weight.

Description

(1) Technical field [0001] The invention relates to welding technology, in particular to a scraping vibration brazing method for preparing a foamed aluminum sandwich structure. (2) Background technology [0002] Aluminum foam is a new type of porous material with numerous bubbles distributed in the metal aluminum matrix. It has the characteristics of a continuous metal phase and a dispersed air phase, and is a new type of material with a variety of excellent properties. The pore size of the bubbles in foamed aluminum is relatively large, and it has a high porosity (40% to 90%), so that its density is only 0.1 to 0.4 times that of metal aluminum. The bending ratio stiffness of aluminum foam can reach 1.5 times that of steel, the damping performance can reach 5-10 times that of metal aluminum, and it has a high energy absorption rate, making its shock absorption performance very outstanding. In addition, aluminum foam also has good acoustic performance, excellent electromagn...

AI Technical Summary

Problems solved by technology

However, the oxide film on the surface of the aluminum material is dense and has a high melting point, which is difficult to remove, which seriously hinders the spreading and wetting of the solder on the base metal, and the special porous structure on the surface of the foamed aluminum makes the removal of the oxide film more difficult, so The solder does not spread as smoothly as on the aluminum sheet, which is also a problem in the brazing process of aluminum foam

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