A device and method for preparing foamed 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 aluminum foam by using a bottom blowing powder spraying method. The powder spraying system transports foaming gas and fluidized additive particles to slit-type breathable bricks through a blowing pipeline. The foaming gas and particles are blown into the molten aluminum from the bottom of the foaming chamber by the slit-type breathable brick, and the two processes of adding particle stirring and blowing foam in the traditional aluminum foam preparation process are simplified to blowing gas and particles together Aluminum liquid, the bubbles float up to form foam, which is collected, cooled, annealed and rolled by the rolling system to realize the continuous production of foamed aluminum; the device for preparing foamed aluminum by the bottom blowing powder spraying method includes powder spraying system, blowing pipeline, Slit-type air-permeable bricks, crucibles, agitators and rolling systems; the invention uses the method of bottom blowing and powder spraying to blow gas and particles into the aluminum liquid at the same time, so that the particles are evenly dispersed and not easy to agglomerate, and the particle dispersibility is improved. The performance of the aluminum foam material 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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