Method for preparing gradient porous tungsten

A technology of gradient porous and porous tungsten, applied in the field of preparing gradient porous tungsten, which can solve the problems of insufficient pore characteristics of gradient porous tungsten

Active Publication Date: 2018-01-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above method to prepare gradient porous tungsten has obvious deficiencies in the control of its pore characteristics.

Method used

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  • Method for preparing gradient porous tungsten
  • Method for preparing gradient porous tungsten
  • Method for preparing gradient porous tungsten

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Raw material powder: The raw material powder is commercially available tungsten powder with a particle size of 5 μm and a purity greater than 99.9%;

[0028] 2) Jet mill dispersion treatment: Clean the jet mill equipment, turn on the main control to preheat, fill high-purity nitrogen with a purity higher than 99.9% as the working gas, reduce the oxygen content to 0.1%, open the grinding valve, and adjust the grinding pressure to 0.70MPa , add high-purity tungsten powder into the grinding chamber for grinding to make the agglomerates open, adjust the rotation speed of the sorting wheel to 6000r / min, and start the sorting wheel;

[0029] 3) Jet mill classification treatment: reduce the rotation speed of the sorting wheel several times to 5000r / min, 4000r / min, 3000r / min, 2000r / min and 1000r / min, and collect tungsten powder in five batches;

[0030] 4) Compression forming: select tungsten powder collected at 4000r / min, 2000r / min and 1000r / min for three-layer powder sprea...

Embodiment 2

[0033] 1) Raw material powder: The raw material powder is commercially available tungsten powder with a particle size of 5 μm and a purity greater than 99.9%;

[0034] 2) Jet mill dispersion treatment: Clean the jet mill equipment, turn on the main control to preheat, fill high-purity nitrogen with a purity higher than 99.9% as the working gas, reduce the oxygen content to 0.1%, open the grinding valve, and adjust the grinding pressure to 0.60~ 0.80MPa, add high-purity tungsten powder into the grinding chamber for grinding to make the agglomerates open, adjust the rotation speed of the sorting wheel to 6000r / min, and start the sorting wheel;

[0035] 3) Jet mill classification treatment: reduce the rotation speed of the sorting wheel several times to 5000r / min, 4000r / min, 3000r / min, 2000r / min and 1000r / min, and collect tungsten powder in five batches;

[0036] 4) Hot pressing sintering: choose to collect tungsten powder at 4000r / min, 3000r / min, 2000r / min and 1000r / min for stac...

Embodiment 3

[0038] 1) Raw material powder: The raw material powder is commercially available tungsten powder with a particle size of 8 μm and a purity greater than 99.9%;

[0039] 2) Jet mill to disperse and remove fine powder: Clean the jet mill equipment, turn on the main control to preheat, fill in high-purity nitrogen with a purity higher than 99.9% as the working gas, reduce the oxygen content to 0.1%, open the grinding valve, and adjust the grinding The pressure is 0.60~0.80MPa, add high-purity tungsten powder into the grinding chamber for grinding, so that the agglomerates are opened, adjust the rotation speed of the sorting wheel to 6000r / min, and start the sorting wheel;

[0040] 3) Jet mill classification treatment: reduce the rotation speed of the sorting wheel several times to 6000r / min, 3500r / min, 2800r / min, 2100r / min and 1000r / min, and collect tungsten powder in five batches;

[0041] 4) Hot pressing sintering: select three kinds of tungsten powders processed at 3500r / min, 280...

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Abstract

The invention provides a method for preparing gradient porous tungsten, and belongs to the technical field of porous material preparation. After high-purity tungsten powder is subjected to dispersiontreatment through air flow grinding, aggregates of original tungsten powder can be opened, and completely-dispersed tungsten powder is obtained; and after classification treatment, narrow-size-distribution tungsten powder of different particle sizes can be obtained; and the tungsten powder of different particle sizes is matched after selection treatment, and the gradient porous tungsten can be prepared through powder paving-pressing-sintering or laminating powder paving-hot press sintering. The gradient porous tungsten prepared through the method is controllable in pore property, uniform in size and distribution of pore diameters of various layers and good in pore connectivity. Two or more kinds of powder of different particle sizes are selected to be matched, and the number of layers of afinal gradient porous tungsten product and the pore properties of the layers can be flexibly controlled.

Description

technical field [0001] The invention belongs to the technical field of porous material preparation and provides a method for preparing gradient porous tungsten. Background technique [0002] Porous materials have many excellent properties such as low density, high specific surface area, stability, etc., and their pores can accommodate a large number of guest molecules or large-sized guests, making porous materials useful in many technical fields such as catalysts, fillers, and composite materials. major applications. Various components made of porous tungsten as a porous body or porous matrix are widely used in power electronics, aerospace and other high-temperature fields, such as porous cathode substrates for high current densities, filters for high-temperature fluids, and high-temperature components for rocket nozzles. Heating body, etc. The opening porosity, pore shape, pore size and uniformity of pore distribution of porous tungsten have a significant impact on the pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C27/04
Inventor 秦明礼李睿陈铮章林张忍陈鹏起章雨峰鲁慧峰贾宝瑞曲选辉
Owner UNIV OF SCI & TECH BEIJING
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