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Functional gradient foamed aluminum and preparation method thereof

A technology of functional gradient and aluminum foam, which is applied in the field of functional gradient aluminum foam and its preparation, can solve the problems of inability to accurately control foam porosity, pore size, poor structure and performance of gradient aluminum foam, and deformation of foam joints, etc., to achieve good Energy-absorbing effect, uniform distribution of cells, and increased cushioning and energy-absorbing performance

Active Publication Date: 2021-11-19
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.

Method used

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  • Functional gradient foamed aluminum and preparation method thereof
  • Functional gradient foamed aluminum and preparation method thereof
  • Functional gradient foamed aluminum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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-based composite materials, in particular to functional gradient foamed aluminum and a preparation method thereof. The gradient foamed aluminum comprises at least one pure foamed aluminum layer and at least one carbon nanotube reinforced foamed aluminum-based composite material layer, wherein the porosity of the adjacent pure foamed aluminum layers is different; and the porosity of the adjacent carbon nanotube reinforced foamed aluminum-based composite material layers is different and / or the content of carbon nanotubes is different. According to the functional gradient foamed aluminum and the preparation method thereof provided by the invention, the density gradient and the component gradient are combined, the functional gradient foamed aluminum with the base material and the density changing at the same time is prepared, the gradient material can be designed in a targeted mode according to the service environment of the material, and the advantages of the gradient foamed material are fully played, so that the good energy absorption effect is achieved; and under the condition that the overall porosity is the same, the gradient foamed aluminum has higher stress level and higher energy absorption capacity compared with uniform foamed aluminum, so that the buffering and energy absorption performance of the gradient foamed aluminum is improved.

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 Applications(China)
IPC IPC(8): C22C1/08B22F3/11B22F3/02B22F1/00C22C21/00
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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