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Preparation method for low-density porous metal material

A porous metal and low-density technology, which is applied in the field of preparation of low-density porous metal materials, can solve the problems of high cost, complicated preparation process, and large pore size, and achieve the effects of high porosity, high specific surface area, and low thermal conductivity

Inactive Publication Date: 2014-03-26
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that in the preparation of porous metal materials, the preparation methods with a porosity greater than 90% mainly include powder metallurgy, fiber sintering, melt foaming, melt blowing, metal deposition, and self-propagating sintering. Disadvantages such as coarseness, complicated preparation process, and high cost

Method used

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  • Preparation method for low-density porous metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a low-density porous metal material (low-density porous iron), comprising the following steps:

[0029] (1) Use 0.2-0.5μm iron powder as the original metal powder, 10μm industrial grade PS microspheres as the pore-forming agent, completely dissolve 0.5g PVA in 10ml deionized water by magnetic stirring, take 0.5g PS microspheres and add the above In the PVA aqueous solution, the PS balls were uniformly dispersed by ultrasonic stirring, and then 4.0 g of iron powder was added, ultrasonically dispersed and stirred to form a uniformly dispersed slurry.

[0030] (2) Insert a cylindrical polytetrafluoroethylene tube into the slurry, and the inner diameter of the mold tube is 5.0mm, then place the sample container in the freezing cavity, and use liquid nitrogen as the freezing medium for freezing and molding. After freezing, the container was removed and placed in a vacuum drying oven for dehydration and drying, and the dried sample was demolded.

[003...

Embodiment 2

[0033] A method for preparing a low-density porous metal material (low-density porous aluminum), comprising the following steps:

[0034] (1) Use 0.5-1.0μm aluminum powder as the original metal powder, 10μm industrial grade PS microspheres as the pore-forming agent, completely dissolve 0.5g PVA in 10ml deionized water by magnetic stirring, take 0.8g PS microspheres and add the above In the PVA aqueous solution, the PS balls were uniformly dispersed by ultrasonic stirring, and then 3.7 g of aluminum powder was added, ultrasonically dispersed and stirred to form a uniformly dispersed slurry.

[0035] (2) Insert a cylindrical polytetrafluoroethylene tube into the slurry, and the inner diameter of the mold tube is 10 mm, then place the sample container in the freezing cavity, and use heavy oil as the freezing medium for freezing and molding. After freezing, the container was removed and placed in a vacuum drying oven for dehydration and drying, and the dried sample was demolded. ...

Embodiment 3

[0038] A method for preparing a low-density porous metal material (low-density porous copper), comprising the following steps:

[0039] (1) With 1.0-5.5μm copper powder as the original metal powder and 20μm industrial-grade PS microspheres as the pore-forming agent, completely dissolve 0.5g of PVA in 10ml of deionized water by magnetic stirring, take 1.0g of PS microspheres and add them to the above In the PVA aqueous solution, the PS balls were uniformly dispersed by ultrasonic stirring, and then 3.5 g of copper powder was added, ultrasonically dispersed and stirred to form a uniformly dispersed slurry.

[0040](2) Insert a cylindrical polytetrafluoroethylene tube into the slurry, and the inner diameter of the mold tube is 10mm, then place the sample container in the freezing cavity, and use liquid nitrogen as the freezing medium for freezing and molding. After freezing, the container was removed and placed in a vacuum drying oven for dehydration and drying, and the dried sam...

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Abstract

The invention discloses a preparation method for a low-density porous metal material. The preparation method is characterized by comprises the following steps: according to mass percent, taking raw materials of 70-95% of metal elementary substance powder, 5-10% of polyvinyl alcohol and 0-20% of polystyrene microsphere; preparing the polyvinyl alcohol into a polyvinyl alcohol aqueous solution with the mass percent concentration of 5-10%; adding the polystyrene microsphere into the polyvinyl alcohol aqueous solution, adding the metal elementary substance powder, stirring and mixing uniformly to obtain a pulp material; pouring the pulp material into a tubular pillar polytetrafluoroethylene tube mould, freezing, drying, molding and demoulding; placing a dried material into a pipe furnace with flowing inert atmosphere, and sintering at the temperature of 400-500 DEG C for 2-6 h to obtain the low-density porous metal material. The porous metal prepared by the preparation method has a relative density which can be as low as 5%; most part of the metal is through-hole; the hole diameters have the characteristic of bimodal distribution; the poriness and the microstructure are uniform and adjustable, and a certain mechanical strength is achieved.

Description

technical field [0001] The invention belongs to the preparation of porous metal materials, and relates to a preparation method of low-density porous metal materials. The low-density porous metal material prepared by the invention can be widely used in filtration and separation devices, porous electrodes, sensors, catalysts and catalyst carriers, capacitors, heat exchangers, sound-absorbing and shock-absorbing materials, high-temperature sealing and high-performance structural materials, and the like. Background technique [0002] Porous metal material is a new type of engineering material with dual characteristics of structure and function. It not only retains the metal properties of metal such as weldability, ductility, and electrical conductivity, but also has the advantages of light weight, high specific surface area, and reduced energy absorption. Shock, noise reduction, electromagnetic shielding, breathable and water permeable, low thermal conductivity, etc., has unique...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C1/04
Inventor 张魁宝吴浪黄毅马雪滕元成李玉香
Owner SOUTHWEAT UNIV OF SCI & TECH
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