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Preparation method of large-porosity porous tungsten tube

A large-porosity, porous tungsten technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of low production cost and inability to prepare high-purity large-porosity porous tungsten tubes, and achieve low production costs and high hardness , the effect of uniform density

Active Publication Date: 2018-11-27
安泰天龙钨钼科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a large-porosity porous tungsten tube, which overcomes that the existing cold isostatic pressing or molding, sintering and processing methods cannot produce high-purity, large aspect ratio, thin-walled, high-strength The problem of large-porosity porous tungsten tubes has filled the technical gap in the preparation of large-porosity porous tungsten tubes. The large-porosity porous tungsten tubes prepared by the process of the present invention have uniform structure and high strength. At the same time, the production process is reasonable and the production efficiency is high. Production low cost

Method used

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  • Preparation method of large-porosity porous tungsten tube
  • Preparation method of large-porosity porous tungsten tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The large-porosity porous tungsten tube prepared in this embodiment has a density of 8.22g / cm 3 , the porosity is 57.5%, and the finished product specification is D50*d40*110mm (outer diameter*inner diameter*height).

[0044] Its preparation method comprises the following steps:

[0045] (1) Preparation of tungsten powder and mold

[0046] Take tungsten powder with a purity ≥ 99.95%, an average Fischer particle size of 7.0 μm, and a cumulative particle size distribution below 2 μm with a volume content of no more than 0.6%. Take 2 zirconia ceramic tubes and 2 ceramic rings with zirconia purity ≥ 99.9%; the specifications of the ceramic tubes are: D66*d62*170mm (ie thick tube 1) and D46*d42*170mm (ie thick tube 1) ; The specifications of the ceramic ring are: D62*d46*2mm (namely the bottom ring 3 and the spacer ring 4).

[0047] (2) Molding

[0048] Use a funnel to load the tungsten powder into the zirconia ceramic mold composed of ceramic tubes and ceramic rings in ...

Embodiment 2

[0064] A porous tungsten tube with large porosity, the density of the porous tungsten tube is 7.19g / cm 3 , the porosity is 62.8%, and the finished product specification is D50*d40*110mm.

[0065] Its preparation method comprises the following steps:

[0066] (1) Preparation of tungsten powder and mold

[0067]Take tungsten powder with a purity ≥ 99.95%, an average Fischer particle size of 8.7 μm, and a cumulative particle size distribution below 2 μm with a volume content of no more than 0.6%. Take 2 zirconia ceramic tubes and 2 ceramic rings with zirconia purity ≥ 99.9%; the specifications of the ceramic tubes are: D64*d60*170mm (thick tube 1) and D40*d36*170mm (thin tube 2) ; The specifications of the ceramic ring are: D60*d40*2mm (namely the bottom ring 3 and the spacer ring 4).

[0068] (2) Molding

[0069] Use a funnel to load the tungsten powder into the cavity of the zirconia ceramic mold composed of ceramic tubes and ceramic rings in two times. Each time it is load...

Embodiment 3-4

[0089] The difference between Examples 3-4 and Example 2 is only that the average Fischer particle size of the tungsten powder used is different, and other process steps and process parameters are the same as Example 2. See Table 1 for the average Fischer particle size of the tungsten powder used in Examples 3-4 and the properties of the finished porous tungsten tube. It can be seen that within the range of the average Fischer particle size of 5-10 μm, as the particle size increases, the density will decrease and the porosity will increase.

[0090] Table 1 embodiment 3-4 relevant parameter and result

[0091] Numbering

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Abstract

The invention belongs to the field of preparation technologies of powder metallurgy porous metal materials, in particular to a preparation method of a large-porosity porous tungsten tube. The method comprises the following steps of tungsten powder and die preparation, die-filling, pre-sintering, demoulding, high-temperature sintering and finished product processing. The preparation method solves the problem that an existing isostatic cool pressing or die pressing, sintering and processing methods cannot prepare the large-porosity porous tungsten tube with high purity, a large length-diameter ratio, a thin wall and high strength, fills in the technical gap of a large-porosity porous tungsten tube material, the large-porosity porous tungsten tube material prepared by adopting the above process has a uniform structure, high strength, high purity, a large length-diameter ratio, a thin wall and high hardness, wherein the flexural strength can reach 16 MPa, the purity can reach 99.99%, the length-diameter (outer diameter) ratio can reach 10:1, the wall thickness can be as low as 1 / 15 of the diameter (outer diameter), the hardness HV30 can reach 280, the production process is reasonable,the production efficiency is high, and the production cost is low.

Description

technical field [0001] The invention belongs to the field of preparation technology of powder metallurgy porous metal materials, and in particular relates to a preparation method of a large-porosity porous tungsten tube. Background technique [0002] Porous tungsten is a tungsten product with many pores in its internal structure. It has both the properties of metal and a series of functional properties due to the existence of pores. Porous tungsten and various components made of porous tungsten are widely used in aerospace, power electronics and metallurgical industries. Such as: vaporizer of mercury ion rocket engine; emitter of ion engine; porous tungsten matrix infiltrated coolant to make rocket nozzle throat lining; high-power inflatable thyratron cathode skeleton; use impregnation method to prepare the matrix and melting of electrical contact materials Rare earth metal filtration, etc. [0003] At present, the method used in the mass production of porous tungsten prod...

Claims

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Application Information

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IPC IPC(8): B22F5/12B22F3/11B22F3/24B22F1/00
CPCB22F3/11B22F3/24B22F5/106B22F2003/247B22F1/05
Inventor 董建英杨义兵苏国平韩蕊蕊钟铭王二伟刘俊海
Owner 安泰天龙钨钼科技有限公司
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