A method and device for preparing foamed aluminum from semi-solid slurry based on the blowing method

A technology of semi-solid slurry and foamed aluminum, which is applied in the field of porous foam materials, can solve the problems of affecting the thermal conductivity of foamed aluminum products, low recycling rate, affecting the properties and preparation efficiency of foamed aluminum products, and slowing down the inherent liquid separation phenomenon, saving materials and costs, and achieving the effect of mass production

Active Publication Date: 2021-06-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly two methods for preparing foamed aluminum in the industry for different needs, direct blowing method and melt foaming method; wherein the direct blowing method refers to the method of introducing gas into the metal melt to produce foam materials, and the other The advantage is that the cost is low, and it can realize continuous production in large quantities; during the cooling process of the molten aluminum foam, due to the effect of gravity and surface tension, the foam aluminum will produce liquid separation; the existence of this phenomenon will lead to the flow channel of the foam aluminum The liquid flows downward along the direction of gravity, which eventually leads to the appearance of aluminum foam in the foam collection area, with inconsistent wall thickness, severely uneven cell size, and even the foam above the foam ruptures, and a large amount of aluminum alloy at the bottom accumulates and other structural problems, which seriously affect the foam. Properties and preparation efficiency of aluminum products
[0004] It has been proved by research and practice that relying solely on the aluminum oxide film formed on the surface of aluminum foam cannot maintain the shape of aluminum foam in the collection area for a long time until it cools down; however, the retention time of aluminum foam can be extended by mixing particles, and the particle Concentration and size have a great influence on the speed of foam separation
Nowadays, the input of ceramic particles is already a necessary means in the preparation process of aluminum foam; however, the existence of ceramic particles will affect the thermal conductivity, electrical conductivity and other material parameters of the finished aluminum foam, and the recycling rate in the later stage is very low, which makes the production cost extremely high. high

Method used

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  • A method and device for preparing foamed aluminum from semi-solid slurry based on the blowing method
  • A method and device for preparing foamed aluminum from semi-solid slurry based on the blowing method

Examples

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Embodiment 1

[0027] The structure of the device for preparing foamed aluminum from semi-solid slurry based on the blowing method is as follows: figure 1 As shown, including the crucible 1 and the internal partition 8, there is a gap between the bottom of the partition 8 and the inner bottom surface of the crucible 1, and the top edge of the partition 8 is higher than the upper edge of the crucible 1; the partition 8 separates the inside of the crucible into storage The liquid chamber and the foaming chamber, the foaming chamber is equipped with a stirring paddle 4; the bottom of the crucible 1 is provided with a vent hole opposite to the top 4 of the stirring paddle; the outside of the crucible 1 is provided with a bottom blowing nozzle 7 connected to the vent hole; the outside of the crucible 1 is surrounded There is an induction coil 3;

[0028] The crucible 1 is provided with a traction wheel 5 along the outer side and placed in parallel with the partition 8;

[0029] The traction whe...

Embodiment 2

[0038] Device structure is the same as embodiment 1;

[0039] Method is with embodiment 1, and difference is:

[0040] The obtained aluminum foam has an average pore diameter of 5mm and a porosity of 90%.

Embodiment 3

[0042] Device structure is the same as embodiment 1;

[0043] Method is with embodiment 1, and difference is:

[0044] The obtained aluminum foam has an average pore diameter of 10mm and a porosity of 98%.

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Abstract

A method and device for preparing aluminum foam from a semi-solid slurry based on the blowing method. The method is: (1) adopting a near-liquidus method to prepare an aluminum alloy semi-solid slurry; (2) continuously transporting it into a crucible, and The coil is heated and kept warm; the partition divides the crucible into a liquid storage chamber and a foaming chamber, and a stirring paddle is set in the foaming chamber and a liquid-permeable hole is arranged at the bottom; (3) Stirring is carried out by the stirring paddle, and air is sprayed into the liquid-permeable hole, Foam is formed in the aluminum alloy semi-solid slurry; (4) The foam floats up to the outside of the crucible and collapses, gradually solidifies and is transported out by the traction wheel. The device includes a crucible and a partition inside, and there is a gap edge between the bottom edge of the partition and the inner bottom of the crucible; a stirring paddle is arranged in the foaming chamber, and a liquid-permeable hole is arranged at the bottom; the bottom blowing nozzle communicates with the liquid-permeable hole. The method and device of the invention avoid the separation step of the ceramic particles and the aluminum alloy material, and avoid the separation step of the ceramic particles and the aluminum alloy material in the recovery process, thereby reducing costs.

Description

technical field [0001] The technical field of the term porous foam material of the present invention, in particular relates to a method and device for preparing foamed aluminum from a semi-solid slurry based on an air blowing method. Background technique [0002] As a new type of material with both gas and liquid media, aluminum foam has excellent properties such as light weight, heat insulation, and high electromagnetic shielding. It is widely used in construction, aerospace and other industries; in order to meet the application needs of various industries, foam The efficient preparation of aluminum has become a research focus in the field of metallurgy. [0003] At present, there are mainly two methods for preparing foamed aluminum in the industry for different needs, direct blowing method and melt foaming method; wherein the direct blowing method refers to the method of introducing gas into the metal melt to produce foam materials, and the other The advantage is that the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C1/10
CPCC22C1/08C22C1/1036C22C1/086C22C1/1052
Inventor 耿佃桥张润雨王平
Owner NORTHEASTERN UNIV LIAONING
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