Preparation process of small-aperture foamed aluminum with strictly controllable void ratio

A preparation process and technology of foamed aluminum, applied in the field of preparation of small-pore aluminum foam, can solve the problems of high cost, complex process, difficult to control the uniformity of pore size distribution, etc., and achieve the effect of saving time and cost

Inactive Publication Date: 2012-01-04
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional preparation methods such as infiltration method, precision casting method and other methods are complicated in process, high in cost, difficul

Method used

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  • Preparation process of small-aperture foamed aluminum with strictly controllable void ratio
  • Preparation process of small-aperture foamed aluminum with strictly controllable void ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Selecting the commercial aluminum powder with a purity of 99% and a particle size of 30 microns, and industrial sodium chloride with an average particle size of 175 microns, according to the volume requirements of the prepared product, weigh specific quality aluminum powder and chloride Sodium particles, add a small amount of ethanol, mix the three mechanically until uniform, press the mixed powder into a prefabricated block in one direction under a pressure of 260MPa, and then put the prefabricated block into the furnace for sintering at 663°C for 22 hours. Put the sintered briquette into a hot water bath at 95°C and heat for 10 hours to prepare aluminum foam with small pores.

[0022] After detection and analysis, the porosity of the prepared product is 73.2%, the pore size is about 175 microns, the pore size distribution is uniform, and it is a three-dimensional interconnected space network structure.

Embodiment 2

[0023] Embodiment 2: select the commercial aluminum powder that purity is 99%, particle diameter is 30 microns, the average particle diameter is the industrial sodium chloride of 325 microns, according to the volume requirement of preparation product, take the aluminum powder of specific quality and chloride Sodium granules, add a small amount of acetone, and mix the three mechanically until they are uniform. Press the mixed powder into a prefabricated block in one direction under a pressure of 250MPa, and then put the prefabricated block into a furnace for sintering at 660°C for 20 hours. Put the sintered briquette into a hot water bath at 95°C and heat for 10 hours to prepare aluminum foam with small pores.

[0024] After detection and analysis, the porosity of the prepared product is 64.8%, the pore size is about 325 microns, the pore size distribution is uniform, and it is a three-dimensional interconnected space network structure.

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Abstract

The invention relates to a preparation process of small-aperture foamed aluminum, and particularly relates to a preparation method of through-hole foamed aluminum with micron-scale aperture, high void ratio and uniformly distributed voids by powder metallurgy. The method comprises: mechanically and evenly mixing an appropriate amount of commercially pure aluminum powder and industrial sodium chloride granules as base materials with additives such as ethanol and other organic solvents; and adding the mixed powder into a mould, carrying out unidirectional pressing at the pressure of 230-450 MPa by utilizing a hydraulic press to prepare a precast block (green compact), placing the precast block into a furnace, insulating and sintering for 15-20 hours at the temperature of 660-800 DEG C, naturally cooling to room temperature, and heating the sintered blank for 8-15 hours in 75-95 DEG C water bath to obtain the small-aperture foamed aluminum.

Description

technical field [0001] The invention relates to a preparation process of small-diameter foamed aluminum, in particular to a preparation method of through-hole foamed aluminum with a micron pore size, high porosity, and uniform void distribution. Background technique [0002] Aluminum foam is a new type of material composed of metal matrix and pores, in order to use the number of pores (shrinkage, porosity, pores, etc.) mm-6mm), mechanical properties such as strength can be sacrificed to obtain superior performance characteristics such as heat, sound, energy absorption, and light weight, and become a new type of structural functional material. In the field of environmental protection, national defense science and technology, and general industrial fields, it has broad application prospects. However, the traditional preparation methods such as infiltration method and precision casting method have complicated process, high cost, difficult control of porosity and uniformity of ...

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C21/00
Inventor 杨玉杰刘先松高尚
Owner ANHUI UNIVERSITY
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