Powder metallurgy diffusion method for preparing foamed aluminum, foamed aluminum and sandwich foamed aluminum plate prepared by same

A technology of powder metallurgy and diffusion method, used in other manufacturing equipment/tools, turbines, engine components, etc., can solve the problems of decreased quality of foam materials, increased defects, unfavorable foaming process, etc., to eliminate cracks and holes, high quality Effect

Active Publication Date: 2020-10-30
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of alloying elements, the compactness and plasticity of the powder decreased significantly
If the alloy powder is directly used for direct compaction, the compactness of the foamed body will decrease significantly, and the defects will increase significantly, resulting in a decrease in the quality of the foam material.
However, although the foaming precursor can be prepared directly by mixing pure metal powders, the plasticity and toughness of the material can be improved, but the alloy elements are not sufficiently mixed to form an alloy, and the melting point does not decrease to reach the melting point of the alloy, and the melting is not uniform.
Not conducive to the subsequent foaming process

Method used

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  • Powder metallurgy diffusion method for preparing foamed aluminum, foamed aluminum and sandwich foamed aluminum plate prepared by same
  • Powder metallurgy diffusion method for preparing foamed aluminum, foamed aluminum and sandwich foamed aluminum plate prepared by same
  • Powder metallurgy diffusion method for preparing foamed aluminum, foamed aluminum and sandwich foamed aluminum plate prepared by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] according to figure 1 The process flow chart for preparing foamed aluminum is used to prepare foamed aluminum, wherein hot rolling is used after cold pressing.

[0025] The raw material is the blowing agent TiH 2 (300 mesh) 0.8 parts by weight, thickener MnO 2 (300 mesh) 1.2 weight parts, pure Al powder (300 mesh) 87 weight parts, pure Si powder (400 mesh) 6 weight parts and pure Cu powder (300 mesh) 5 weight parts, above raw material powder all is market purchase, purity Higher than 99%.

[0026] The powder mixing process adopts ball milling for 30 minutes, and the cold pressing pressure is 400MPa. After cold pressing, the foaming precursor body is preheated at 475°C for 30 minutes, and then hot rolled. The initial thickness of hot rolling is 15.1±0.1mm, and the final thickness is 2.8± 0.1mm. A diffusion annealing step is performed, the diffusion annealing temperature is 475° C., and the annealing time is 48 h. The temperature of the foaming process is 640° C., an...

Embodiment 2

[0030] Carry out in substantially the same manner as in Example 1, except that the raw material is blowing agent TiH 2 (300 mesh) 0.6 parts by weight, thickener MnO 2 (300 mesh) 0.6 weight part, pure Al powder (300 mesh) 88.8 weight part, pure Si powder (400 mesh) 8 weight part and pure Cu powder (300 mesh) 2 weight part, above raw material powder all is market purchase, purity Higher than 99%.

[0031] The foaming precursor prepared in Example 2 has no defects such as cracks and holes, and the final foamed aluminum material is relatively uniform in pore size, with a foaming porosity of 65%, a pore size of 0.6-1.4 mm, and no large through holes, Pore ​​structure defects such as cracks.

Embodiment 3

[0033] Carry out in substantially the same manner as Example 1, the difference is that wherein the raw material is blowing agent TiH 2 (300 mesh) 1.4 parts by weight, thickener MnO2 (300 orders) 1.8 parts by weight, pure Al powder (300 orders) 85.8 parts by weight, pure Si powder (400 orders) 4 parts by weight and pure Cu powder (300 orders) 7 parts by weight, above raw material powders all are market purchases, purity Higher than 99%.

[0034] The foaming precursor prepared in Example 3 has no defects such as cracks and holes, and the final foamed aluminum material is relatively uniform in pore size, with a foaming porosity of 82%, a pore size of 0.9-2.0mm, and no large through holes, Pore ​​structure defects such as cracks.

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Abstract

The invention relates to a powder metallurgy diffusion method for preparing foamed aluminum, the foamed aluminum and a sandwich foamed aluminum plate prepared by the method and belongs to the technical field of nonferrous metals. The method comprises the following specific steps of mixing aluminum powder, silicon powder and copper powder to replace traditional aluminum alloy powder, then mixing with a foaming agent and a thickening agent, performing cold pressing, hot rolling or hot extrusion, and then carrying out a diffusion annealing step, so that the defects of cracks, holes and the like are eliminated while aluminum, silicon and copper in the material are changed into an alloy phase; and then, performing heating and foaming to prepare the foamed aluminum, or carrying out composite hotrolling with a pure metal plate and then performing foaming to prepare the sandwich foamed aluminum plate. The method has the advantages that cold pressing and extrusion are completed by utilizing the excellent formability of the pure metal powder, then diffusion annealing is carried out, a foaming precursor with higher quality is obtained, and the components of the foam material are accurate, controllable and adjustable; and the foamed aluminum and the sandwich foamed aluminum plate have relatively uniform aperture and excellent mechanical property without large through holes and cracks.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metals, and in particular relates to a powder metallurgy diffusion method for preparing foamed aluminum and foamed aluminum and sandwich foamed aluminum boards prepared therefrom. Background technique [0002] Closed-cell aluminum foam has excellent mechanical properties such as low density, high specific strength, high specific stiffness, and good energy absorption capacity, as well as functionalities such as good vibration damping performance, good noise reduction effect, and high electromagnetic shielding performance. It is a development in the past 20 years. A new multifunctional material with a novel structure and a wide range of applications. Commonly used preparation methods include gas blowing method, melt foaming method, and powder metallurgy method. Among them, the blowing method and the melt foaming method can usually only obtain plate-shaped aluminum foam parts, and it is difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11B22F5/00
CPCB22F3/1125B22F5/00
Inventor 丁宇升王华东宋鹏陈明梁岳莹彭海春
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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