Interface metallurgical bonding aluminum foam slab and preparation method thereof

Abstract

The invention discloses an interface metallurgical bonding aluminum foam slab and a preparation method thereof. The slab is prepared by forming a uniform and integrated skin layer on a foamed aluminum core layer through an interface metallurgical method; the skin layer is a dense aluminum plate which is formed by a foamed aluminum core layer substrate undergone fusion, and the thickness of the skin layer is 0.5mm to 2mm. The preparation method comprises the steps of putting the pretreated foamed aluminum core layer substrate on an interface heating platform of an interface heating furnace, meanwhile, applying uniformly static pressure on a stop block through a pressing machine, forming the skin layer which is integrated with the core layer on the surface of a foamed aluminum core layer slab. The preparation of a foam aluminum sandwich panel of which the integrated structure is composed of the skin layer and the core layer is realized, the stability of performance of the foam aluminum sandwich panel is improved. The problem that the original foam aluminum sandwich panel is not stable is solved, and excellent properties of a foam aluminum sandwich structure is maintained.

Description

technical field [0001] The invention relates to the technical field of preparation of a porous metal foamed aluminum plate, in particular to an interface metallurgically bonded foamed aluminum sandwich structure plate and a preparation method thereof. Background technique [0002] As a new type of material, aluminum foam sheet has been popularized and applied in many fields, especially aluminum foam sandwich structure composite sheet, because of its light weight, high strength, heat insulation, non-combustible, high temperature resistance, anti-electromagnetic interference, etc. Physical and mechanical properties, can be used as sound-absorbing, structural parts, etc., widely used in automobile manufacturing, rail transit, aerospace and other fields, and has the advantages of isotropic core performance and low cost. [0003] In the prior art, there are mainly the following methods for manufacturing foamed aluminum sandwich structural panels: one is the adhesive bonding metho...

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Problems solved by technology

[0003] In the prior art, there are mainly the following methods for manufacturing foamed aluminum sandwich structural panels: one is the adhesive bonding method, which mainly relies on the viscous properties of the adhesive, and combines dense metal plates, fiber reinforced plates and other materials with foam Aluminum-metal composite, under high temperature or special environment, the adhesive deactivates and ages, which has a great impact on the material properties, and its application is greatly restricted. At present, it is mainly used for the preparation of non-metallic surface plates such as marble; the second is Using the rolling-powder metallurgy method, the Chinese invention patent application with the application publication number CN104690275A discloses a method for preparing a foamed aluminum sandwich structure. According to the required alloy composition of the foamed aluminum core, aluminum powder and other alloy element powders are mixed The materials are mixed according to a certain ratio and placed between two panels, and then heated at an appropriate temperature until the core of the composite panel is melted, and the foaming agent decomposes to generate gas to foam the aluminum melt to obtain a foamed aluminum core sandwich structure

This method is greatly affected by the density, and it is difficult to be applied to large-scale production; the third is to prepare foamed aluminum sandwich structure plates by welding, and the Chinese invention patent application with the application publication number CN103286404A discloses a foamed aluminum sandwich structure material In this method, brazing filler metal and brazing flux are mixed to form a viscous shape, coated on the surface to be welded of aluminum foam and aluminum plate to assemble a structure to be welded, and after the whole is dried, brazing in a furnace is carried out under a protective atmosphere , to obtain foamed aluminum sandwich structure materials, when the welding pretreatment is improper, or the flux and welding consumables are improperly selected, the welding is not tight and the performance of the plate is affected

The aluminum foam sandwich structure plate produced by rolling-powder metallurgy and welding has poor interface stability and complicated process equipment

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