Nanometer tungsten powder and method for preparing nanometer tungsten powder by adoption of sol-gel hydrogen reduction method

A nano-tungsten powder, sol-gel technology, applied in the field of tungsten materials, can solve the problems of difficult operation and high equipment requirements, and achieve the effects of easy operation, uniform grain distribution and high purity

Inactive Publication Date: 2014-03-12
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the equipment requires high requirements and is not easy to operate

Method used

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  • Nanometer tungsten powder and method for preparing nanometer tungsten powder by adoption of sol-gel hydrogen reduction method
  • Nanometer tungsten powder and method for preparing nanometer tungsten powder by adoption of sol-gel hydrogen reduction method
  • Nanometer tungsten powder and method for preparing nanometer tungsten powder by adoption of sol-gel hydrogen reduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Dosage: Add 196.67g of ammonium tungstate and 314.74g of citric acid to 500mL of distilled water; in the present invention, the ratio of ammonium tungstate (chemically pure) and citric acid (chemically pure) is 1:1.1 according to the ratio of metal ion to citrate Measure and weigh.

[0060] see figure 1 As shown, then pour the weighed ammonium tungstate and citric acid into the reaction vessel 1 filled with distilled water, stir with the stirrer 2 at a stirring speed of 120 rpm, and detect the solution after the ammonium tungstate and citric acid are dissolved When the pH value is lower than 6, use ammonia water (purchased in the market) to adjust the pH ≈ 6. Then turn on the constant temperature heater 3, set the temperature at 80°C, and stir continuously at the same time to form a wet gel with a complex structure through evaporation and polycondensation.

[0061] When the wet gel turns into a viscous paste, take it out and put it in an evaporating dish. Place the we...

Embodiment 2

[0076] Dosage: Add 150.0g of ammonium tungstate and 240.05g of citric acid to 500mL of distilled water.

[0077] see figure 1 As shown, then pour the weighed ammonium tungstate and citric acid into the reaction vessel 1 filled with distilled water, stir with the stirrer 2 at a stirring speed of 100 rpm, and detect the solution after the ammonium tungstate and citric acid are dissolved When the pH value is lower than 6, use ammonia water (purchased in the market) to adjust the pH to 6.5. Then turn on the constant temperature heater 3, set the temperature at 85°C, and stir continuously at the same time to form a wet gel with a complex structure through evaporation and polycondensation.

[0078] When the wet gel turns into a viscous paste, take it out and put it in an evaporating dish, place the wet gel and evaporating dish together in a drying oven, set the temperature at 110°C, and after drying for 20 hours, when the moisture is removed It turns into a porous xerogel.

[007...

Embodiment 3

[0093] Dosage: Add 170.0g of ammonium tungstate and 272.06g of citric acid to 500mL of distilled water.

[0094] see figure 1 As shown, then pour the weighed ammonium tungstate and citric acid into the reaction vessel 1 filled with distilled water, stir with the stirrer 2 at a stirring speed of 150 rpm, and detect the solution after the ammonium tungstate and citric acid are dissolved When the pH value is lower than 6, use ammonia water (purchased in the market) to adjust the pH to 6.2. Then turn on the constant temperature heater 3, set the temperature at 75° C., and keep stirring at the same time to form a wet gel with a complex structure through evaporation and polycondensation.

[0095] When the wet gel turns into a viscous paste, take it out and put it in an evaporating dish, place the wet gel and the evaporating dish together in a drying oven, set the temperature at 100°C, and dry for 48 hours, when the moisture is removed It turns into a porous xerogel.

[0096] The ...

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Abstract

The invention discloses nanometer tungsten powder and a method for preparing the nanometer tungsten powder by the adoption of a sol-gel hydrogen reduction method. Ammonium tungstate and citric acid are utilized to generate a complex, and hydrogen low temperature sintering is carried out on the complex to be restored. The method comprises the steps that the ammonium tungstate, the citric acid and distilled water are mixed, and after mixing and regulating of the pH value, constant-temperature concentration is carried out to form wet gel; the wet gel is dried in a drying box to form dry gel; the dry gel is sintered in a muffle furnace to obtain a predecessor; the predecessor is sintered and restored according to a preset sintering temperature in a vacuum sintering furnace with argon and hydrogen mixed gas protection to obtain the nanometer tungsten powder. The preparation method is simple in operation, low in temperature, capable of regulating the yield according to the size of a chamber of the furnace, and good in temperature stability of a tungsten powder room.

Description

technical field [0001] The invention relates to a tungsten material used for hydrogen-helium irradiation, more particularly to a nano-tungsten powder and a method for preparing the nano-tungsten powder by a sol-gel hydrogen reduction method. Background technique [0002] One of the main uses of nano-tungsten powder is to prepare ultra-fine nano-scale tungsten carbide, which has become an indispensable material in many high-tech fields. In addition to the cemented carbide market, there is also a great demand for nano-tungsten powder in the fields of microelectronics industry, fine chemical industry, surface technology, aerospace industry, and nuclear industry. At present, only a few countries in the world can produce nano-tungsten powder and nano-tungsten-based alloy, and the price is expensive. The nano-tungsten powder produced by some domestic manufacturers has low particle uniformity and is mixed with tungsten oxides, which severely limits the application of domestic tung...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26B82Y40/00
Inventor 朱开贵刘方舒
Owner BEIHANG UNIV
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