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

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...

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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

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