Nano foamed aluminum composite sandwich panel with gradient interface and preparation method thereof

Abstract

The invention provides a nano foamed aluminum composite sandwich panel with a gradient interface and a preparation method thereof. The nano foamed aluminum composite sandwich panel with the gradient interface comprises upper and lower metal surface layers, upper and lower middle layers and a core layer. The core layer is a foamed aluminum sandwich layer with the gradient interface. The upper and lower middle layers are nano material and foamed aluminum composite layers. The upper and lower metal surface layers are made of one of aluminum, aluminum alloy, steel, titanium and titanium alloy. No clear interface exists between the upper and lower metal surface layers and the upper and lower middle layers as well as between the upper and lower middle layers and the foamed core layer, and a gradient interface area exists. Compositions and structures in the interface area achieve continuous transition, and mechanical strength of the nano material and foamed aluminum composite reinforced sandwich panel is high. The foamed aluminum sandwich panel prepared through the method is high in mechanical strength, long in service life, not prone to layering, capable of solving the surface layer stripping problem happening when the foamed aluminum sandwich panel is stressed and prolonging the service life of the foamed aluminum sandwich panel, simple in preparation method and high in size controllability.

Description

technical field [0001] The invention belongs to the technical field of aluminum foam sandwich panel materials, and in particular relates to a nano-foam aluminum composite sandwich panel with a gradient interface and a preparation method thereof. Background technique [0002] The foamed aluminum sandwich panel is a metal material with many cellular pores formed by a solid frame or a planar interlaced structure. The core layer of the foamed aluminum sandwich panel is foamed aluminum or foamed aluminum alloy, and the panel is a metal panel. The cell structure is divided into closed cells and closed cells. There are two forms of open cells. The open cell structure means that the internal cells are connected to each other, and each cell is not closed. The closed structure means that the internal cells are independent of each other, and each cell is closed. Therefore, the aluminum foam sandwich panel has good energy absorption characteristics, impact resistance, high specific stre...

AI Technical Summary

Problems solved by technology

Therefore, the aluminum foam sandwich panel has good energy absorption characteristics, impact resistance, high specific strength, electromagnetic shielding, sound absorption performance, high damping, low thermal conductivity and electrical conductivity, etc., and is widely used in electronics, communications, chemical industry, metallurgy, machinery , construction, transportation, aerospace technology, military protection and other fields have broad application prospects, but the aluminum foam sandwich panel is prone to peeling of the surface layer when it is stressed, and its strength is low, which limits the application field

[0003] Chinese patent CN 103935080B discloses a polymer / aluminum foam integrated composite sandwich panel. The middle of the sandwich panel is an aluminum foam core layer, the upper and lower sides are polymer / aluminum foam composite layers, and the upper and lower surfaces are pure polymer protective surfaces. The two ends of the open-cell foam aluminum plate are respectively immersed in the polymer fluid and solidified. The composite sandwich panel prepared by this method replaces the metal surface layer. Good, but the mechanical strength is reduced compared to the metal finish, and the bearing capacity is reduced

It can be known from the above prior art that the existing aluminum foam sandwich panels are all at the obvious interface, and the structure and composition on both sides of the interface are discontinuous. When the mechanical load is applied, the interface stress is uneven or the stress is concentrated, which is easy to cause interface debonding or interface debonding. Shear and tear failure of adjacent foamed aluminum

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