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Preparation method of porous aluminum or aluminum alloy

An aluminum alloy and microporous technology, applied in the field of porous metal material preparation, can solve the problems of difficulty in obtaining microporous aluminum or aluminum alloy, easy oxidation, etc., and achieve the effects of low cost, controllable pore structure, and simple process

Active Publication Date: 2014-11-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high activity of aluminum or aluminum alloy, its surface is easy to oxidize. The finer the aluminum or aluminum alloy particles are, the more serious the oxidation is. It is difficult to obtain metallurgically bonded microporous aluminum or aluminum alloy by conventional atmosphere sintering or vacuum sintering.

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  • Preparation method of porous aluminum or aluminum alloy

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Effect test

Embodiment 1

[0027] The preparation method of microporous aluminum or aluminum alloy described in this embodiment, such as figure 1 As shown, it specifically includes the following steps:

[0028] (1) Preparation of mixed powder billet: L03 industrial pure aluminum powder with a particle size of 30-45 μm and NaCl particles with a particle size of 10-25 μm are used as raw materials for batching, and the volume percentage of NaCl particles in the mixed powder is 30%. Pure aluminum powder and NaCl particles were mixed in a mixer for 3 hours to obtain a uniform mixed powder, and the mixed powder was pressed under a pressure of 500 MPa to obtain a mixed powder blank;

[0029] (2) Vacuum hot pressing of the mixed powder blank: heat the mixed powder blank prepared in step (1) to 600°C for vacuum hot pressing (vacuum degree 10 -3 Pa, vacuum hot-pressing pressure 20MPa, vacuum hot-pressing time 2 hours), after vacuum hot-pressing, cool down with the furnace to obtain a vacuum hot-pressed billet; ...

Embodiment 2

[0032] The preparation method of microporous aluminum or aluminum alloy described in this embodiment, such as figure 1 As shown, it specifically includes the following steps:

[0033] (1) Preparation of mixed powder billet: 6061 aluminum alloy powder with a particle size of 25-37 μm and NaCl particles with a particle size of 25-37 μm are used as raw materials for batching. Among them, the volume percentage of NaCl particles in the mixed powder is 50%, aluminum The alloy powder and NaCl particles were mixed in a mixer for 2 hours to obtain a uniform mixed powder, and the mixed powder was pressed under a pressure of 400 MPa to obtain a mixed powder compact;

[0034] (2) Vacuum hot pressing of the mixed powder blank: heat the mixed powder blank prepared in step (1) to 560°C for vacuum hot pressing (vacuum degree 0.5*10 -2 Pa, vacuum hot-pressing pressure 40MPa, vacuum hot-pressing time 1 hour), after vacuum hot-pressing, cool down with the furnace to obtain a vacuum hot-pressed ...

Embodiment 3

[0037] The preparation method of microporous aluminum or aluminum alloy described in this embodiment, such as figure 1 As shown, it specifically includes the following steps:

[0038] (1) Preparation of mixed powder blank: ZL101 aluminum alloy powder with a particle size of 37-53 μm and NaCl particles with a particle size of 75-100 μm are used as raw materials, wherein the volume percentage of NaCl particles in the mixed powder is 70%, and the aluminum alloy powder After mixing with NaCl particles in a mixer for 1 hour, a uniform mixed powder was obtained, and the mixed powder was pressed under a pressure of 100 MPa to obtain a mixed powder compact;

[0039] (2) Vacuum hot pressing of the mixed powder blank: heat the mixed powder blank prepared in step (1) to 530°C for vacuum hot pressing (vacuum degree 10 -2 Pa, vacuum hot pressing pressure 50MPa, vacuum hot pressing time 0.5 hours), vacuum hot pressing after cooling with the furnace to obtain a vacuum hot compact;

[0040]...

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Abstract

The invention relates to a preparation method of porous aluminum or aluminum alloy, and belongs to the technical field of the preparation of porous metal materials. The invention employs aluminum or aluminum alloy powder and NaCl powder particles as raw materials; the powders are mixed and pressed into a blank; the blank is heated to the melting point of industrial pure aluminum or30-100 DEG C lower than an aluminum alloy solid point for vacuum hot pressing, so as to realize metallurgical bonding of aluminum or aluminum alloy powder; and after cooling of the vacuum hot pressing blank, NaCl grains in the vacuum hot pressing blank are removed through water dissolving, so as to obtain microporous aluminum or aluminum alloy. The preparation method of microporous aluminum or aluminum alloy has the characteristics of controllable porous structure, simple process and low cost, and can realize industrialization production.

Description

technical field [0001] The invention relates to a method for preparing microporous aluminum or aluminum alloy, and belongs to the technical field of porous metal material preparation. Background technique [0002] Porous aluminum or aluminum alloy with a through-hole structure has the characteristics of low density, high specific strength, energy absorption, sound absorption and vibration reduction, permeation and circulation, and low thermal conductivity. , fire retardant and other fields have a broad application market. Microporous aluminum or aluminum alloy with a microporous structure has better performance in the above application fields due to the miniaturization of the pore structure. [0003] Currently known mainstream methods for preparing porous aluminum or aluminum alloys mainly include infiltration casting and powder metallurgy. [0004] The conventional infiltration casting method prepares porous aluminum or aluminum alloy, which is to infiltrate the aluminum ...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C21/00
Inventor 左孝青陆建生罗晓旭
Owner KUNMING UNIV OF SCI & TECH