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Tungsten nanopowder

A nano-powder and tungsten oxide technology is applied in the field of tungsten nano-powder and its preparation, which can solve the problems that tungsten oxide is difficult to meet the requirements of particle size, the preparation cost is increased, and the industrial scale is difficult to meet the requirements.

Active Publication Date: 2013-09-18
康硕(山西)智能制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the tungsten oxide (WO) produced by the above-mentioned pyrolysis method 3 ) particle size is relatively coarse, usually the particle size of the product obtained from APT raw material is 10-20μm, while the particle size of the product obtained from tungstic acid raw material is 3-10μm
In order to obtain higher chemical activity in the subsequent preparation of tungsten powder and better promotion of alloys with special requirements, tungsten oxide (WO 3 ) has a finer particle size and a larger specific surface area, which makes the tungsten oxide (WO) prepared by the traditional pyrolysis method 3 ) is becoming more and more difficult to meet the granularity requirements
People began to turn the research to other tungsten oxide (WO 3 ) preparation method, such as the gas phase method, although the gas phase method can obtain finer tungsten oxide (WO) such as tens of nm 3 ) powder, but its preparation cost is greatly increased compared with the pyrolysis method, and the industrial scale is difficult to meet the requirements

Method used

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  • Tungsten nanopowder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, ammonium paratungstate (APT) with a particle size of about 5 μm and a purity greater than 99.9wt% was selected as the reaction raw material, distilled water was added to the reaction vessel, and stirred with an electromagnetic stirrer at a stirring speed of 180-200r / min, and lemon was added while stirring. acid solution;

[0024] Second, after waiting for the citric acid solution to completely dissolve and mix evenly, add high-purity ammonium paratungstate (APT) to the reaction vessel while stirring, and finally calculate the molar ratio of ammonium paratungstate (APT) to citric acid to be 3;

[0025] Third, after the high-purity ammonium paratungstate (APT) has been added, add ammonia water with a concentration of 30%, and stir evenly to obtain a reaction solution;

[0026] Fourth, the reaction solution is concentrated in an evaporation container, and the concentrated solution is dried in a drying device at 150-160° C. to obtain a precursor;

[0027] Fifth, the...

Embodiment 2

[0030] First, ammonium paratungstate (APT) with a particle size of about 5 μm and a purity greater than 99.9wt% was selected as the reaction raw material, distilled water was added to the reaction vessel, and stirred with an electromagnetic stirrer at a stirring speed of 180-200r / min, and lemon was added while stirring. acid solution;

[0031] Second, after the citric acid solution is completely dissolved and mixed evenly, add high-purity ammonium paratungstate (APT) to the reaction vessel while stirring, and finally the molar ratio of ammonium paratungstate (APT) to citric acid is calculated as 1.5;

[0032] Third, after the high-purity ammonium paratungstate (APT) has been added, add ammonia water with a concentration of 30%, and stir evenly to obtain a reaction solution;

[0033] Fourth, the reaction solution is concentrated in an evaporation container, and the concentrated solution is dried in a drying device at 150-160° C. to obtain a precursor;

[0034] Fifth, the precu...

Embodiment 3

[0037] First, ammonium paratungstate (APT) with a particle size of about 5 μm and a purity greater than 99.9wt% was selected as the reaction raw material, distilled water was added to the reaction vessel, and stirred with an electromagnetic stirrer at a stirring speed of 180-200r / min, and lemon was added while stirring. acid solution;

[0038] Second, after waiting for the citric acid solution to completely dissolve and mix evenly, add high-purity ammonium paratungstate (APT) to the reaction vessel while stirring, and finally calculate the molar ratio of ammonium paratungstate (APT) to citric acid to be 1;

[0039] Third, after the high-purity ammonium paratungstate (APT) has been added, add ammonia water with a concentration of 30%, and stir evenly to obtain a reaction solution;

[0040] Fourth, the reaction solution is concentrated in an evaporation container, and the concentrated solution is dried in a drying device at 150-160° C. to obtain a precursor;

[0041] Fifth, the...

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Abstract

The invention relates to tungsten nanopowder and a preparation method thereof. WO3 nanopowder which is uniform in particle size distribution is obtained by adopting APT (Ammonium Paratungstate) formed by optimal raw materials, citric acid and ammonia water, and matched preparation technical parameters, that is the flow of oxygen per gram of precursor is 55ml / min, and the heat treatment temperature is 520 DEG C, and then, the tungsten nanopowder meeting the requirements is obtained by hydrogen reduction, wherein the molar ratio of APT to citric acid is 1.5.

Description

technical field [0001] The invention relates to a tungsten powder and a preparation method thereof, in particular to a tungsten nanometer powder and a preparation method thereof. Background technique [0002] Nanocrystalline cemented carbide has excellent properties such as high strength, high toughness, high hardness, good wear resistance and thermal corrosion resistance, which are difficult for conventional materials, and nano-tungsten powder is the key raw material for preparing nano-carbide cemented carbide. [0003] In the current technology, the main preparation of tungsten powder is through tungsten oxide (WO 3 ) prepared by reduction, and now tungsten oxide (WO 3 ) preparation method is mainly calcination pyrolysis method, wherein the raw material of pyrolysis mainly involves ammonium paratungstate (APT) and tungstic acid (H 2 WO 4 ), and the corresponding thermal decomposition formulas are: [0004] 5(NH 4 ) 2 O·12WO 3 ·5H 2 O=12WO 3 +10NH 3 +10H 2 O(1), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/30B22F9/26
Inventor 刘亚静
Owner 康硕(山西)智能制造有限公司