A kind of radial negative gradient aluminum foam sandwich panel and preparation method thereof

A technology of radial gradient and foamed aluminum, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of low strength, limitations, and influence on the popularization and application of uniform foamed aluminum sandwich panels, and achieve The effect of improving the protection effect, good density, and broad application prospects

Active Publication Date: 2021-09-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low strength of homogeneous foamed aluminum sandwich panels restricts and affects its popularization and application in load-bearing structures, and from the perspective of light weight, the homogeneous foam core layer in sandwich panels is not optimal, so It is necessary to design an optimized inner core structure and preparation method to meet the application requirements of foamed aluminum sandwich panels

Method used

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  • A kind of radial negative gradient aluminum foam sandwich panel and preparation method thereof
  • A kind of radial negative gradient aluminum foam sandwich panel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, select closed-cell aluminum foams of different densities, and use a wire-cut electric discharge machine to cut the foam materials into cylindrical, circular, and other shapes of the same volume, and splicing and combining them according to the density. Taking the density change area divided into three layers as an example, the central layer is in the shape of a cylinder with a density of ρ 1 ; The middle layer is in the shape of a ring with a density of ρ 2 ;The outermost layer is a cube or cuboid after removing the cylinder inside, and the density is ρ 3 ,but ρ 1 ρ 2 ρ 3 ; According to the order of density and shape, weld or bond to obtain the radial gradient aluminum foam unit cell 3 . The porosity of the radial gradient aluminum foam unit cell gradually changes from the inside to the outside along the radial direction, from 90% to 50%.

[0029]Then, a certain number of radially negative gradient aluminum foam cells 3 are arranged sequentially in the p...

Embodiment 2

[0031] Example 2: First, using the method for preparing gradient porous materials in Chinese patent CN 101418391 B, the matrix powder is mixed with a porogen, and then absolute ethanol is added to prepare a suspension; then the suspension is poured into a mold, and then Centrifugal deposition; drying after centrifugal deposition, taking out the rough after demoulding, and then sintering in a graphite mold to obtain a billet; removing the porogen in the billet to obtain a radial negative gradient aluminum foam unit cell 3. The porosity of the radially gradient aluminum foam density gradually changes from the inside to the outside along the radial direction, from 80% to 10%, and the pore size is 30-480µm;

[0032] Then, a certain number of radially negative gradient aluminum foam cells 3 are arranged sequentially in the plane, and the surface contact parts between the cells are welded to obtain the radial gradient aluminum foam core layer 2 .

[0033] Finally, use sandpaper to p...

Embodiment 3

[0034] Example 3: First, select closed-cell aluminum foams of different densities, and use a wire-cut electric discharge machine to cut the foam materials into shapes such as cylinders and rings of the same volume, and splice and combine them according to the density. Taking the density change area divided into three layers as an example, the central layer is in the shape of a cylinder with a density of ρ 1 ; The middle layer is in the shape of a ring with a density of ρ 2 ;The outermost layer is a cube or cuboid after removing the cylinder inside, and the density is ρ 3 ,but ρ 1 ρ 2 ρ 3 ; According to the order of density and shape, weld or bond to obtain the radial gradient aluminum foam unit cell 3 . The density of the radial gradient aluminum foam is that the porosity gradually changes from the inside to the outside along the radial direction, from 90% to 50%.

[0035] Then, a certain number of radial negative gradient aluminum foam cells 3 are arranged sequential...

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Abstract

The invention belongs to the technical field of metal material structure design and provides a foamed aluminum sandwich panel with radial negative gradient. It is a layered structure, from bottom to top is the lower layer, the radial negative gradient aluminum core layer and the upper layer; the inner surface of the upper layer and the lower layer are glued or welded to the top of the radial gradient aluminum core layer It is connected and fixed with the bottom; the radial negative gradient aluminum foam core layer is composed of several radial negative gradient aluminum foam units arranged in sequence in the plane, and the contact parts between the units are welded or connected by secondary foaming; the negative gradient aluminum foam unit The density of cells starts from the centroid of the square and gradually increases along the radial direction. Reasonable structure, excellent performance, low density, high specific stiffness, high specific strength, good stability, impact resistance, electromagnetic shielding, excellent damping characteristics, low thermal conductivity and electrical conductivity, heat insulation, sound insulation, in chemical industry, metallurgy, machinery, Construction and civil engineering, high-speed automobiles, ships, packaging and transportation, aerospace, military protection and other engineering materials have broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of metal material structure design, and specifically relates to a radial negative gradient aluminum foam sandwich panel and a preparation method thereof; the radial negative gradient aluminum foam sandwich panel is suitable for civil engineering, aerospace, high-speed train ships, Fan blades and other engineering materials. Background technique [0002] Aluminum foam is made by adding additives to pure aluminum or aluminum alloy after foaming process. It has both metal and air bubble characteristics. It is a new multi-functional material with complex mesoscopic structure. It has high specific strength, specific High stiffness and good energy absorption and other characteristics. Gradient foam material refers to a material whose composition or structure changes gradually so that the corresponding mechanical properties of the material change. There are many types of gradient foam materials, such as hierarchi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01B32B15/08B32B15/18B32B15/20B32B17/06B32B3/22B32B7/10B32B7/12B32B37/10B32B37/12
CPCB32B3/18B32B5/18B32B7/10B32B7/12B32B15/046B32B15/18B32B15/20B32B17/066B32B27/065B32B37/06B32B37/12B32B2250/40B32B2266/045B32B2307/102B32B2307/212B32B2307/304B32B2307/558B32B2307/56B32B2307/718B32B2307/722
Inventor 王根伟王维刘冕宋辉郭美卿
Owner TAIYUAN UNIV OF TECH
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