Method for manufacturing foamed aluminum sandwich plate

Abstract

The invention relates to a method for manufacturing a foamed aluminum sandwich plate, which belongs to the field of porous foam metal and laminar composite materials. The method comprises the following steps of: uniformly mixing aluminum-silicon alloy powder prepared by an atomization method, and foaming agent titanium hydride powder and metal magnesium powder in a certain ratio; filling the powder into a thin-wall steel (or aluminum alloy) tube with one sealed end; sealing the other end of the tube after powder filling and preparing a rolled blank; rolling and compounding at a slow speed on a cold rolling mill; trimming an obtained composite plate and cutting a foamed preformed blank according to the size of a foaming mold; foaming the preformed blank in a steel mold in a limited way; adjusting foaming temperature and foaming time as required; and foaming at a high temperature for a short period of time to obtain a high-quality foamed aluminum sandwich plate with a uniform foam structure in a core layer, good interface bonding, high thickness accuracy and excellent plate profile. The method has the outstanding characteristics of low equipment requirement, high plate profile accuracy of a product, high three-point bending strength and the like and is advantaged technology suitable for mass industrial production of foamed aluminum sandwich structural materials.

Description

technical field [0001] The invention belongs to the technical field of porous foamed metal materials and layered composite materials, and in particular relates to a method for preparing a foamed aluminum sandwich panel. Background technique [0002] At present, foam boards are widely used in various fields, especially aluminum foam sandwich boards have outstanding characteristics such as light weight, high specific strength and specific stiffness, good impact resistance, and good electromagnetic shielding performance. They are used in aviation, aerospace, and automobile manufacturing. , rail transit and other fields have broad application prospects. Now, the known preparation processes of aluminum foam sandwich panels mainly include gluing and powder metallurgy foaming methods. Among them, the core layer of the gluing method is mostly produced by the melt foaming method. Foamed aluminum plate, its size is easy to control, and the pore structure is relatively uniform. Its dis...

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Problems solved by technology

[0002] At present, foam boards are widely used in various fields, especially aluminum foam sandwich boards have outstanding characteristics such as light weight, high specific strength and specific stiffness, good impact resistance, and good electromagnetic shielding performance. They are used in aviation, aerospace, and automobile manufacturing. , rail transit and other fields have broad application prospects. Now, the known preparation processes of aluminum foam sandwich panels mainly include gluing and powder metallurgy foaming methods. Among them, the core layer of the gluing method is mostly produced by the melt foaming method. Foamed aluminum plate, its size is easy to control, and the pore structure is relatively uniform. Its disadvantages are that the bonding strength of the glued sandwich plate is low, and its high temperature resistance and corrosion resistance are poor.

The existing preparation methods of powder metallurgy foamed preforms are hot pressing method and general rolling compounding method. In the hot pressing process, because the panel / core layer needs to rely on a long hot pressing process to achieve initial bonding, the production efficiency is low. , In addition, limited by the size of the hot pressing mold and the capacity of the press, this process cannot produce products of larger specifications

In the general rolling composite method, since the edge of the billet is a free boundary during the rolling process, the loss of powder is relatively large, and the powder density at the edge is relatively low.

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