Method and device for preparing porous foam metal through super-gravity seepage

Abstract

The invention provides a method and a device for preparing porous foam metal through super-gravity seepage and belongs to the field of foam metal material preparation. In the invention, soluble salt particles of which the average particle size is 0.1-5mm are used as a precursor, and metal is used as a seepage body. A centrifugal casting mold is filled with the soluble salt particles which are dried and sieved, and a porous plate is fixed at the top of the precursor. The centrifugal casting mold which is preheated is assembled on a centrifugal platform, centrifugal equipment is started, and molten metal which is pre-molten is poured into a feeding hopper of the centrifugal equipment. The molten metal being driven by super-gravity seeps into gaps of the precursor via the porous plate, and the super-gravity coefficient of the process is controlled above 20-180 from the big to the small according to the average particle size of the soluble salt particles, namely the precursor. After the metal is solidified, the centrifugal casting mold is disassembled, a compound body is taken out, and cutting processing is carried out. The soluble salt particles are dissolved by using water and removed from the compound body, and the porous foam metal is obtained. The method is simple in technology and low in cost, and the prepared foam aluminum alloy is even in structure, proper in size and excellent in mechanical properties.

Description

technical field [0001] The invention belongs to the field of foamed metal materials, in particular, the invention relates to a method and a device for preparing through-hole foamed metal by adopting supergravity seepage technology. Background technique [0002] Through-hole metal foam has the characteristics of high specific surface area, high specific strength, energy absorption, sound absorption, heat preservation, heat insulation, filtration, etc. It has great application potential in the fields of construction, rail transit, machinery manufacturing, aerospace, and energy catalysis. It has become a new type of material that countries all over the world are competing to develop. [0003] At present, the preparation methods of through-hole metal foam mainly include powder metallurgy, investment casting and infiltration casting. The powder metallurgy method has a long production cycle and high cost, and is not suitable for the production of through-hole metal foams for gene...

AI Technical Summary

Problems solved by technology

The powder metallurgy method has a long production cycle and high cost, and is not suitable for the production of through-hole metal foams for general industrial use; the investment casting method usually uses a three-dimensional through-hole foam sponge material as the matrix, and then fills the sponge with gypsum and other materials, and is formed by drying and hardening. The prefabricated type is then roasted to decompose the foam sponge to make a porous gypsum mold, and then the prefabricated mold is placed in the mold and then cast through the percolation method to obtain a three-dimensional through-hole metal foam material, but this method has porous Difficulty in making gypsum molds, difficult removal of gypsum after seepage, etc.

The infiltration casting method is considered to be the most promising method for producing foam metal due to its simple process and convenient operation, but the current infiltration casting method has the following shortcomings: (1) In order to overcome the seepage resistance caused by the surface tension of the molten metal, the Liquid seepage usually requires high external pressure, such as pneumatic casting or vacuum casting, so the casting equipment is required to be sophisticated, which increases manufacturing costs and reduces production efficiency; (2) The operation is difficult, and it is easy to cause insufficient seepage and excessive seepage and other defects, and it is difficult to determine the end time of seepage; (3) when the molten metal is poured into the mold, the filler particles are impacted and easily form depressions; (4) it is difficult to prepare large-scale seepage products

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