A kind of functional gradient aluminum foam and preparation method thereof

A functionally graded, foamed aluminum technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of inability to precisely control foam porosity, pore size, poor structure and performance of gradient foamed aluminum, and deterioration of matrix adhesion, etc. Good energy absorption effect, uniform cell distribution, stable and reliable method

Active Publication Date: 2022-05-24
四川新能源汽车创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite sandwich panel includes upper and lower metal surface layers, upper and lower middle layers and a core layer. The core layer is an aluminum foam sandwich layer with a gradient interface, and the upper and lower middle layers are composite layers of nanomaterials and aluminum foam. It is prepared by powder foaming. Metal powder is mixed with foaming agent and then foamed at high temperature, but this method cannot accurately control the porosity and pore size of the foam, and the cell structure is poor
In addition, in the preparation process of the composite sandwich panel, a pre-compression is performed after each mixed powder is put in. However, the pre-compression will deteriorate the matrix bonding between two adjacent layers to a certain extent, resulting in two layers under compressive load. Foam joints are the first to deform
[0007] Therefore, in view of the disadvantages of existing gradient aluminum foams such as poor structure and performance, it is a technical problem to be solved in this field to provide a gradient foam material with simple and stable preparation process, high strength and good energy absorption.

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  • A kind of functional gradient aluminum foam and preparation method thereof
  • A kind of functional gradient aluminum foam and preparation method thereof
  • A kind of functional gradient aluminum foam and preparation method thereof

Examples

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Embodiment 1

[0041] A functionally graded aluminum foam with upper and lower layers, comprising a carbon nanotube-reinforced foamed aluminum matrix composite material layer with a porosity of 50% and a pure foamed aluminum layer with a porosity of 70%.

[0042] The gradient aluminum foam of this embodiment is prepared by the following method:

[0043] (1) Calculate and weigh the composite powder and pore-forming agent of pure aluminum powder, carbon nanotubes and aluminum powder required for two layers, and the carbon nanotube reinforced foamed aluminum-based composite material layer takes by weighing 14.33g urea particles (2mm), Take by weighing 28.78g carbon nanotube / aluminum composite powder (carbon nanotube content 3wt.%) as group 1; Pure foamed aluminum layer takes by weighing 20.06g urea particle (2mm), takes by weighing 17.45g pure aluminum powder (180 order) as Group 2;

[0044] (2) Add dropwise 5% ethanol by mass fraction to each group of mixed powders, and mix evenly to obtain a...

Embodiment 2

[0048] A functionally graded aluminum foam with upper, middle and lower layers, the upper and lower layers have a porosity of 70%, corresponding to a pure foamed aluminum layer, and the middle layer has a porosity of 60%, corresponding to a carbon nanotube-reinforced foamed aluminum-based composite material layer.

[0049] The gradient aluminum foam of this embodiment is prepared by the following method:

[0050] (1) Calculate and weigh the composite powder and pore-forming agent of pure aluminum powder, carbon nanotubes and aluminum powder required for the three layers. The pure foamed aluminum layer takes 13.38g urea particles (1.5mm), and weighs 11.64g pure Aluminum powder (180 mesh) is as group 1 and group 3; Carbon nanotube reinforced foamed aluminum matrix composite material layer takes by weighing 11.47g urea particle (1.5mm), takes by weighing 15.32g carbon nanotube / aluminum composite powder (carbon nanotube content 2wt.%) as group 2;

[0051] (2) Add dropwise 5% etha...

Embodiment 3

[0055] A four-layer functionally graded aluminum foam, the porosity of the uppermost layer and the lowermost layer is 70%, corresponding to the pure foam aluminum layer; the porosity of the middle and upper layers is 50%, corresponding to 1.5wt.% carbon nanotube reinforced aluminum foam matrix composite material layer; the middle and lower layers have a porosity of 50%, corresponding to a 3wt.% carbon nanotube-reinforced foamed aluminum matrix composite material layer.

[0056] The gradient aluminum foam of this embodiment is prepared by the following method:

[0057] (1) Calculate and weigh the composite powder and pore-forming agent of pure aluminum powder, carbon nanotubes and aluminum powder required for the four layers, take 10.03g urea particles (1.5mm) for the pure foamed aluminum layer, and weigh 8.73g pure Aluminum powder (180 mesh) is as group 1 and group 4; Carbon nanotube reinforced foamed aluminum matrix composite material layer takes by weighing 7.16g urea partic...

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Abstract

The invention relates to the cross-technical field of porous metal and metal-matrix composite materials, in particular to a functional gradient aluminum foam and a preparation method thereof. The gradient aluminum foam of the present invention comprises at least one layer of pure foamed aluminum layer and at least one layer of carbon nanotube reinforced foamed aluminum matrix composite material layer; the porosity of adjacent pure foamed aluminum layers is different; adjacent carbon nanotubes reinforced foamed aluminum matrix composite The material layers differ in porosity and / or in carbon nanotube content. The present invention combines the density gradient with the composition gradient to prepare functionally gradient aluminum foams with simultaneous changes in matrix material and density. The gradient material can be designed according to the service environment of the material, and the advantages of the gradient foam material can be fully utilized, with good absorption. Energy effect; in the case of the same overall porosity, the gradient aluminum foam of the present invention has a higher stress level and higher energy absorption than uniform aluminum foam, thereby increasing its cushioning energy absorption performance.

Description

technical field [0001] The invention relates to the cross-technical field of porous metal and metal-matrix composite materials, in particular to a functional gradient aluminum foam and a preparation method thereof. Background technique [0002] The interior of metal foam is composed of holes and metal skeletons of different sizes and shapes to realize the functionalization of structural materials. It has light weight, high specific strength and specific stiffness, energy absorption, damping, good acoustics, heat and electromagnetic shielding, etc. It is widely used in aerospace, petrochemical, medical, vehicle, construction, etc., and has become one of the research hotspots in the field of materials today. Foamed aluminum is made by adding additives to pure aluminum or aluminum alloy and undergoing a foaming process. It has both metal and foaming characteristics. It is a new strategic functional structural material with low density, high impact absorption ability, It has th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08B22F3/11B22F3/02B22F1/05C22C21/00
CPCB22F3/1121B22F3/1109B22F3/02C22C21/00C22C26/00C22C2026/002
Inventor 杨旭东成莹邹田春
Owner 四川新能源汽车创新中心有限公司
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