Device and method for preparing foamed aluminum based on electromagnetic stirring under action of compound magnetic field

Abstract

The invention discloses a device and a method for preparing foamed aluminum based on electromagnetic stirring under action of a compound magnetic field and belongs to the technical field of porous metal foam materials. The device comprises a reactor shell, molds, electromagnetic stirring devices, a temperature control device, induction coils, filling materials, a valve, an air vent and a feeding pipeline. The method comprises the following steps: proportioning, heating, introducing a thickening agent and a foaming agent, electrifying and stirring, and carrying out foaming reaction. According to the device and method for preparing the foamed aluminum through electromagnetic stirring under the action of the compound magnetic field, an alternating magnetic field is generated through the induction coils; the alternating magnetic field interacts with induced current in the foamed aluminum; electromagnetic pressure perpendicular to the wall surfaces of the molds and pointed to the center of foamed aluminum melt is generated; the contact pressure and the sliding friction force between the foamed aluminum and the wall surfaces of the molds are reduced; the non-sliding phenomenon is reduced; the foamed aluminum and the wall surfaces of the molds are in a soft contact state; and the foamed aluminum melt flows smoothly, so that the action effect of electromagnetic stirring in the foamed aluminum preparation process is improved.

Description

technical field [0001] The invention belongs to the technical field of porous metal foam materials, in particular to a device and method for preparing foamed aluminum based on electromagnetic stirring under the action of a composite magnetic field. Background technique [0002] Aluminum foam is a new type of material with excellent properties of both gas phase and liquid phase media materials. It has outstanding advantages such as light weight, strong sound absorption performance, low price, and strong heat preservation. It has great potential in aerospace, safety protection and other fields. Broad application prospects. At present, the preparation methods of aluminum foam mainly include melt foaming method, powder metallurgy method, blowing foaming method and so on. Among them, the melt foaming method has the advantages of simple process flow and low production cost. [0003] In the process of preparing aluminum foam by melt foaming method, stirring is required. The purpo...

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Problems solved by technology

[0005] Aiming at the poor effect of electromagnetic stirring produced by the melt foaming method in the prior art, the present invention proposes a device and method for preparing aluminum foam based on electromagnetic stirring under the action of a composite magnetic field. The present invention uses an induction coil to generate an alternating magnetic field, and the alternating magnetic The variable magnetic field interacts with the induced current in the foamed aluminum to generate electromagnetic pressure perpendicular to the mold wall and pointing to the center of the foamed aluminum melt, thereby reducing the contact pressure and sliding friction between the foamed aluminum and the mold wall, reducing non-slip phenomenon, so that they reach a soft contact state, and then the aluminum foam melt flows smoothly, thereby improving the effect of electromagnetic stirring in the preparation of foam aluminum

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