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Method for utilizing directional solidification technique to prepare porous metal materials

A porous metal and directional solidification technology, applied in the field of porous material preparation, can solve the problems of difficult to control the size and distribution of pores of porous metal materials, uneven pore size and distribution of porous metal materials, and low strength, etc., to achieve excellent mechanical properties, Controllable pore size and improved mechanical strength

Inactive Publication Date: 2015-11-11
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing porous metal materials using directional solidification technology, which solves the problem that the size and distribution of pores in existing porous metal materials are not uniform and the strength is not high, and the preparation method is difficult to control the size and distribution of pores in porous metal materials. , and the problem of complex process and high cost

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  • Method for utilizing directional solidification technique to prepare porous metal materials
  • Method for utilizing directional solidification technique to prepare porous metal materials

Examples

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Effect test

Embodiment 1

[0044] Preparation of Oriented Porous Aluminum Metal Materials

[0045] Take 40% metal aluminum powder and 60% sodium chloride powder respectively by volume percentage, weigh the CaO particles of 4% of the total mass of metal aluminum powder and sodium chloride powder, put them into metal aluminum powder and sodium chloride powder, at 850 ℃ Heat the metal aluminum powder and sodium chloride powder for 2 hours to a molten state, and mix them uniformly to obtain a metal aluminum slurry;

[0046] The above metal aluminum slurry is injected into a cylindrical mold composed of graphite and wrapped with phenolic foam on the side, and then the bottom of the mold injected with the slurry is placed on a cooling platform at a temperature of 700°C for 2 hours to cool, so that the sodium chloride is directional solidified, Metal aluminum is still in the molten state, and the mixture of molten metal aluminum and solidified sodium chloride is obtained;

[0047] Remove the phenolic foam ins...

Embodiment 2

[0050] Preparation of Oriented Porous Magnesium Materials

[0051] Get 30% metal magnesium powder and 70% potassium chloride powder respectively by volume percentage, weigh the MnO of metal magnesium powder and potassium chloride powder gross mass 8%. 2 Put the particles into metal magnesium powder and potassium chloride powder, heat the metal magnesium powder and potassium chloride powder at 800°C for 4 hours to a molten state, and mix uniformly to obtain a metal magnesium slurry;

[0052] Inject the above-mentioned metal magnesium slurry into a cylindrical mold composed of graphite and wrapped with phenolic foam on the side, and then place the bottom of the mold injected with the slurry on a cooling platform at a temperature of 750°C for 3 hours to cool, so that potassium chloride is directional solidified, Metal magnesium is still in molten state, obtains the mixture of molten metal magnesium and solidified potassium chloride;

[0053] Remove the phenolic foam insulation m...

Embodiment 3

[0056] Preparation of Oriented Porous Zinc Metal Materials

[0057] Take 20% metal zinc powder and 80% sodium chloride powder respectively by volume percentage, and weigh 12% Al of the total mass of metal zinc powder and sodium chloride powder 2 o 3 Put the particles into metal aluminum powder and sodium chloride powder, heat the metal zinc powder and sodium chloride powder at 950°C for 3 hours to a molten state, and mix uniformly to obtain metal zinc slurry;

[0058] Inject the above-mentioned metal zinc slurry into a cylindrical mold composed of graphite and wrapped with phenolic foam on the side, and then place the bottom of the mold injected with the slurry on a cooling platform at a temperature of 500°C for 4 hours to cool, so that the sodium chloride is directional solidified, Metal zinc is still in molten state, and the mixture of molten metal zinc and solidified sodium chloride is obtained;

[0059] Remove the phenolic foam insulation material wrapped on the side of ...

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Abstract

The invention provides a method for utilizing a directional solidification technique to prepare porous metal materials. The method comprises the following concrete steps of melting and mixing metal powder added with a thickening agent and chlorizated salts powder to form metal slurry; directionally solidifying and quickly cooling the metal slurry in a mould to obtain a mixture of solidified metal and solidified chlorizated salts; removing the chlorizated salts in the mixture; drying to obtain the porous metal materials. According to the method provided by the invention, through the combination of the directional solidification technique and casting forming, the porous metal materials with directionally aligned pores and a porous structure with a certain pore size are obtained, the pore size can be controlled and are uniform, and the mechanical strength of the porous metals is improved through the directional porous structure; due to the phase change forming of the metal from a liquid state to a solid state, a hole wall is more dense, and the porous metal is endowed with more excellent mechanical property; meanwhile, the preparation process is simple, the production efficiency is high, and the method has wide application prospect in the fields such as aerospace, filtering materials, catalyst carriers, porous electrodes, heat exchangers and flame-proof devices.

Description

technical field [0001] The invention belongs to the technical field of porous material preparation, and relates to a method for preparing porous metal materials by directional solidification technology. Background technique [0002] Porous metal material is a new type of engineering material with excellent physical properties and good mechanical properties, that is, pores of various shapes are distributed in the metal matrix, and the metal phase is divided into small units. It has the characteristics of both continuous metal phase and dispersed gas phase. Porous metal materials have low density, high porosity, large specific surface area, and can selectively permeate fluid, as well as excellent sound absorption, energy absorption performance, excellent thermophysical performance and high damping performance. Therefore, it is widely used in automobile, construction, chemical, aerospace, military industry and other fields, and can be used as shock absorber, buffer, energy abs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08
Inventor 汤玉斐邱沙赵康吴聪
Owner XIAN UNIV OF TECH
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