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A method and device for preparing through-hole metal foam by supergravity seepage

A foam metal and supergravity technology, which is applied in the field of foam metal materials, can solve the problems of difficult operation, difficult removal of gypsum, excessive seepage, etc., and achieves the effects of excellent mechanical properties, maintaining product shape and uniform structure.

Active Publication Date: 2019-06-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A method and device for preparing through-hole metal foam by supergravity seepage
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  • A method and device for preparing through-hole metal foam by supergravity seepage

Examples

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Effect test

Embodiment 1

[0025] Sodium chloride particles with a weight of 110 kg and an average particle size of 1 mm are respectively packed into two cubic centrifugal molds with a length, width and height of 0.5 m, and a commercially available porous ceramic plate with a thickness of 5 mm is fixed on the top, and the centrifugal The mold is preheated to 500°C;

[0026] Melt the Al6061 aluminum alloy weighing 190kg and keep the temperature at about 750°C;

[0027] Then install and fix the two centrifugal casting molds symmetrically on a centrifugal platform with a diameter of 2m, turn on the centrifugal equipment, adjust the rotation speed so that the supergravity coefficient of the precursor reaches more than 50, and then pour the aluminum alloy liquid into the hopper of the centrifugal equipment, and the aluminum alloy Under the action of centrifugal pressure, the liquid passes through the feeding tube and penetrates into the gap of the precursor through the porous ceramic plate. After centrifugin...

Embodiment 2

[0030] Put sodium sulfate particles with a weight of 140kg and an average particle size of 0.2mm into four cuboid centrifugal casting molds with a width and height of 0.5×0.5×0.7m, and place a layer of 2mm-thick porous stainless steel plate on the top, and use an electric furnace to separate the centrifuge The mold is preheated to about 600°C;

[0031] Melt ZA-8 zinc alloy weighing 400kg and keep it at about 580°C;

[0032] After that, the four centrifugal casting molds were symmetrically installed and fixed on the centrifugal platform with a diameter of 2m, the centrifugal equipment was turned on and the rotating speed was adjusted to make the supergravity coefficient of the porous plate reach more than 180, and then the zinc alloy liquid was poured into the hopper of the centrifugal equipment, and the zinc alloy Under the action of centrifugal pressure, the liquid passes through the feeding tube and penetrates into the gap of the precursor through the porous stainless steel ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08B22D13/10
Inventor 郭占成王哲高金涛常宽钟怡玮郭磊
Owner UNIV OF SCI & TECH BEIJING
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