Device and method for preparing foam aluminum by bottom blowing powder spraying method

Abstract

The invention belongs to the field of material preparation, and discloses a device and method for preparing foam aluminum by a bottom blowing powder spraying method. Foaming gas and fluidized additiveparticles are transported to a slit type air-permeable brick by a powder spraying system through an air blowing pipe, the foaming gas and the fluidized additive particles are blown from the bottom ofa foaming chamber into aluminum liquid by the slit type air-permeable brick, two process of additive particle mixing and air-blown foaming in a conventional foam aluminum preparation technology are simplified to the process that gas and particles are together blown into the aluminum liquid, bubbles float upward to form foams, and continuous production of foam aluminum is achieved through collection, cooling, annealing and rolling of a rolling system; and the device for preparing foam aluminum by the bottom blowing powder spraying method comprises the powder spraying system, the air blowing pipe, the slit type air-permeable brick, a crucible, an agitator, and the rolling system. According to the method for preparing foam aluminum by the bottom blowing powder spraying method, the gas and the particles are blown together into the aluminum liquid, the particles are uniformly dispersed and not prone to being agglomerated, the dispersibility of the particles is improved, the performance offoam aluminum materials is improved, and the production power consumption is reduced at the same time.

Description

technical field [0001] The invention belongs to the field of material preparation, and specifically discloses a device and a method for preparing foamed aluminum by using a bottom blowing powder spraying method. Background technique [0002] Aluminum foam is a new type of composite material composed of aluminum alloy metal and pores. It has low density, high specific strength, strong impact absorption capacity, high temperature resistance, corrosion resistance, strong fire resistance, sound insulation and noise reduction, high electromagnetic shielding, and weather resistance. Strong, easy to process, easy to install, high forming precision and other advantages, it is widely used in transportation, aerospace, environmental protection, new energy, mechanical chemical industry, electronic and electrical engineering, construction engineering and other fields. The excellent physical, chemical and mechanical properties and recyclability of aluminum foam materials make it have bro...

AI Technical Summary

Problems solved by technology

[0005] The optimum particle size required for aluminum foam blowing and foaming is between 0.5 and 25 μm. Due to the poor wettability of the additive particles and the aluminum liquid, it is difficult to add particles of a few microns or even more than ten microns into the aluminum liquid and disperse them. Uniform; the common way to add particles and make them evenly dispersed at this stage is to directly add particles into the aluminum liquid and stir them before entering the foaming chamber, but this method requires strong stirring to make the particles uniformly dispersed, and will As a result, the temperature of the molten aluminum drops, not only consumes more energy, but also has poor particle dispersion and serious agglomeration in the final foamed aluminum product

[0006] The addition of particles will have a certain impact on the mechanical properties of foamed aluminum, which will increase the brittleness of foamed aluminum

The traditional method of adding particles has poor particle dispersion in the final aluminum foam. In order to meet the requirements of foam stability, a large amount of particles needs to be added. On the one hand, the performance of aluminum foam is reduced, and on the other hand, particle waste

[0007] The traditional method of adding particles to aluminum liquid and stirring and dispersing has the disadvantages of poor particle dispersion and high energy consumption. Therefore, it is necessary to develop an efficient and energy-saving aluminum foam blowing foaming process

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