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Powder metallurgy fabrication method of hollow metal sphere

A metal hollow sphere and powder metallurgy technology, which is applied in the field of metal hollow sphere preparation, can solve the problems of no patent, etc., and achieve the effect of easy sphere size, simple operation steps, and easy control of the overall structure

Inactive Publication Date: 2012-12-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing research technology, there are many related reports on the preparation technology of metal hollow spheres, but there are no reports at home and abroad on the technology and theoretical research of preparing metal hollow sphere structural materials by this method, and there are no related patents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1. Mix 316L stainless steel powder with an average particle size of 25 μm and carboxymethyl cellulose solution with a mass concentration of 0.5%, and prepare suspension 1 after mechanical stirring, and then add n-octanol into the suspension 1 And stir uniformly to obtain a slurry one; the solid content of the suspension one is 20%; the addition of the n-octanol is 0.1% of the suspension one weight;

[0024] Step 2: Pack polystyrene balls with a particle size of 3 mm into a centrifugal mold, then pour the slurry described in step 1 into the centrifugal mold, then install the centrifugal mold on a centrifuge for centrifugation, and finally put the centrifuge The final polystyrene balls are placed in a blast oven with the centrifugal mold for drying; the pouring amount of the slurry one should make the polystyrene balls in the centrifugal mold be completely covered; the centrifugal time is 20min, The rotating speed of the centrifuge is 4000r / min; the drying temperatur...

Embodiment 2

[0029] The preparation method of this example is the same as that of Example 1, except that the particle size of the polystyrene balls in step 2 is 3 mm and 4 mm.

Embodiment 3

[0031] The preparation method of this example is the same as that of Example 1, except that the particle size of the polystyrene balls in step 2 is 2mm, 3mm, 3.5mm and 4mm.

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Abstract

The invention discloses a powder metallurgy fabrication method of a hollow metal sphere, which comprises the following steps of placing a polystyrene sphere in a centrifugal mold, preparing slurry 1 with metal powder, adhesive solution and a defoaming agent, pouring the slurry 1 into the centrifugal mold, centrifuging, putting the centrifuged polystyrene sphere in an oven for drying together with the centrifugal mold, preparing slurry 2 with the metal powder, the adhesive solution and the defoaming agent, pouring the slurry 2 into the dried centrifugal mold, centrifuging, putting the centrifuged polystyrene sphere in the oven for drying together with the centrifugal mold, taking out the dried polystyrene sphere from the centrifugal mold, embedding the polystyrene sphere into alumina packing, and then putting in a vacuum furnace for pyrolysis and sintering, thereby obtaining the hollow metal sphere. The method is reasonable in design, simple in process and low in cost. The hollow metal sphere fabricated by the fabrication method has the advantages of uniform, smooth and complete spherical shell wall thickness, facilitation of sphere dimension selection, easiness in overall structure control and the like.

Description

technical field [0001] The invention belongs to the technical field of metal hollow sphere preparation, and in particular relates to a powder metallurgy preparation method of metal hollow spheres. Background technique [0002] The thermal insulation material used in the middle part of the current thermal protection system is generally alumina ceramic fiber. Although it is light in weight, strong in heat resistance and good in oxidation resistance, it has poor thermal shock resistance and thermal conductivity varies greatly with temperature. Moreover, due to the difference in thermal expansion coefficient between non-metallic and metal cover plates, it is easy to cause structural instability during thermal cycling. The hollow spherical metal foam prepared by sintering or connecting hollow spherical particles is hollow inside, and the spherical shell is dense. It is a new type of functional material with dual properties of function and structure, which can effectively inhibit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/10
Inventor 迟煜頔王建谈萍王辉荆鹏陈金妹康新婷杨坤
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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