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Preparation method of high performance nanometer sized and superfine tungsten powder

An ultra-fine tungsten powder, nano-scale technology, applied in the field of metal smelting, to achieve the effect of increasing added value, inhibiting growth, and improving activity

Inactive Publication Date: 2005-03-16
XIAMEN GOLDEN EGRET SPECIAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no relevant technical report on the direct preparation of high-performance nano-scale and ultra-fine tungsten powder by ammonium paratungstate at home and abroad, and ultra-fine tungsten powder is the main raw material used to directly produce ultra-fine tungsten carbide powder. , the price of high-performance ultra-fine tungsten carbide powder is about 1.5 to 2.0 times that of ordinary micron-sized tungsten carbide powder, and the production cost of ultra-fine tungsten carbide powder is basically the same as that of ordinary micron-sized tungsten carbide powder. Obviously, the profit generated by the production of ultra-fine tungsten carbide powder is much higher than the profit generated by the production of ordinary micron-sized tungsten carbide powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one, the preparation method of a kind of high-performance nanoscale and ultrafine tungsten powder of the present invention is to use ammonium paratungstate 5 (NH 4) 2 O·12WO 3 ·5H 2 O is the raw material, and in a well-sealed container, feed ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O, heat the container, the heating temperature is set to 400 ° C, ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O is heated and decomposed into tungsten trioxide WO 3 , Ammonia NH 3 and water vapor H 2 O, its chemical reaction formula is as follows:

[0036]

[0037] In the container, make full use of tungsten oxide WO X is ammonia NH 3 Decomposition of good catalytic properties, the above thermal decomposition of ammonia NH 3 further decomposed into nitrogen gas N 2 and hydrogen H 2 , and its chemical reaction formula is as follows:

[0038]

[0039] By setting the reaction temperature at 550°C and adjusting the pressure of the furnace ...

Embodiment 2

[0048] Embodiment two, the preparation method of a kind of high-performance nanoscale and ultrafine tungsten powder of the present invention is to use ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O is the raw material, during preparation, ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O is heated and decomposed into tungsten trioxide WO 3 , Ammonia NH 3 and water vapor H 2 O, the heating temperature is 600°C; using tungsten oxide WO X is ammonia NH 3 Decomposition of good catalytic properties, the above decomposition of ammonia NH 3 further decomposed into nitrogen gas N 2 and hydrogen H 2 ; by setting the reaction temperature at 750 °C and adjusting the pressure of the furnace gas at 1.5 mbar, using the above 3 The decomposed hydrogen H 2 , can be tungsten trioxide WO 3 Reduced to blue tungsten oxide WO 2.9 ; Then by further adjusting the reaction temperature and the pressure of the furnace gas, at this time, the temperature was set at 850 ° C, and the...

Embodiment 3

[0049] Embodiment three, a kind of high-performance nanoscale and the preparation method of ultrafine tungsten powder of the present invention, is to use ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O is the raw material, during preparation, ammonium paratungstate 5 (NH 4 ) 2 O·12WO 3 ·5H 2 O is heated and decomposed into tungsten trioxide WO 3 , Ammonia NH 3 and water vapor H 2 O, the heating temperature is 500°C; using tungsten oxide WO X is ammonia NH 3 Decomposition of good catalytic properties, the above decomposition of ammonia NH 3 further decomposed into nitrogen gas N 2 and hydrogen H 2 ; by setting the reaction temperature at 650 °C and adjusting the pressure of the furnace gas at 0.35 mbar, using the above 3 The decomposed hydrogen H 2 , can be tungsten trioxide WO 3 Reduced to blue tungsten oxide WO 2.9 ; Then by further adjusting the reaction temperature and the pressure of the furnace gas, at this time, the temperature is set at 800 ° C, and ...

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Abstract

The invention relates to a method of making kind of high performance nanometer tungsten powder, which is made from 5(NH4)2O.12WO3.5H2O. Heat the above material in container and decompose it into WO3, NH3, and H2O vapor. Then dispose the NH3 into N2 and H2 by using WOx which is good medium for disposing NH3. Deoxidize WO3 into blue WO2.9 through controlling reaction temperature and stove gas pressure. Keep on the same process and deoxidize part of the above WO2.9 into more active WO2.72, so as to improve active property of the whole WOx. Then deoxidize it into quite fine tungsten powder through high purity H2 and remove moisture of the WOx and cool it by air conditioner, deactivate it with protecting gas.

Description

technical field [0001] The invention belongs to metal smelting technology, in particular to a preparation method of high-performance nanoscale and ultrafine tungsten powder. Background technique [0002] Tungsten is one of the most refractory metals, with a melting point as high as 3410°C. It has high hardness, strong ductility, and is not eroded by air at room temperature. Because of these characteristics of tungsten, tungsten powder can be used in a wide range of applications, such as Preparation of high specific gravity alloys, which are used in automatic watch pendulums, telecommunication vibrators, aircraft balance boards, anti-x-rays, alpha-rays, gamma-ray protection plates, etc.; can also be used to prepare electrical alloys, such as high-voltage contacts. At present, there is no relevant technical report on the direct preparation of high-performance nano-scale and ultra-fine tungsten powder by ammonium paratungstate at home and abroad, and ultra-fine tungsten powder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/16
Inventor 吴冲浒吴其山林高安张庆国
Owner XIAMEN GOLDEN EGRET SPECIAL ALLOY
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