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Method for producing extra-coarse tungsten powder

A technology of tungsten powder and sodium tungstate, applied in the field of powder metallurgy, can solve the problems of long reduction time of ultra-coarse tungsten powder, difficult process control, high energy consumption, etc., and achieve the effect of good surface gloss, low cost and broad market

Active Publication Date: 2012-06-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a low-cost method for preparing ultra-coarse tungsten powder, so as to overcome the defects of long reduction time, difficult process control, high energy consumption and high cost in the preparation of ultra-coarse tungsten powder in the prior art

Method used

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  • Method for producing extra-coarse tungsten powder
  • Method for producing extra-coarse tungsten powder
  • Method for producing extra-coarse tungsten powder

Examples

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Effect test

Embodiment 1

[0025] Example 1: The preparation of ultra-coarse tungsten powder with an average particle size of 60 μm should be completed according to the following steps (the SEM photo of the prepared tungsten powder is as follows image 3 shown):

[0026] 1. Prepare a mixed solution of sodium tungstate and ammonium tungstate, the molar ratio of sodium tungstate and ammonium tungstate is 1:100.

[0027] 2. Heat the prepared solution to boiling. When 80% to 90% of the volume evaporates, stop heating, send it to a far-infrared oven, and dry it at 120°C for 10 hours. The precursor of ammonium paratungstate and sodium tungstate crystalline mixture is obtained.

[0028] 3. Wipe and sieve the precursor to make -80 mesh powder, add 10% mass fraction of fine tungsten powder return material, and mix for 2 hours with a V-type mixer.

[0029] 4. In the tubular reduction furnace, hydrogen gas is introduced for reduction, the reduction temperature is 800°C, the reduction time is 1h, and the cross-se...

Embodiment 2

[0033] Example 2: The preparation of ultra-coarse tungsten powder with an average particle size of 150 μm should be completed according to the following steps (the SEM photo of the prepared tungsten powder is as follows Figure 4 shown):

[0034] 1. Prepare a mixed solution of sodium tungstate and ammonium tungstate, the molar ratio of sodium tungstate and ammonium tungstate is 1:40.

[0035] 2. Heat the prepared solution to boiling. When 80% to 90% of the volume evaporates, stop heating, send it to a far-infrared oven, and dry it at 150°C for 2 hours. The precursor of ammonium paratungstate and sodium tungstate crystalline mixture is obtained.

[0036] 3. Wipe and sieve the precursor to make -80 mesh powder, add 20% mass fraction of fine tungsten powder return material, and mix for 2 hours with a V-type mixer.

[0037] 4. Put hydrogen into the tube type reduction furnace for reduction, the reduction temperature is 1000°C, the reduction time is 2h, and the cross-sectional fl...

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Abstract

The invention belongs to the technical field of powder metallurgy, in particular provides a method for producing extra-coarse tungsten powder. The method is characterized in that intermediate products, namely sodium tungstate solution and ammonium tungstate solution, produced by smelting tungsten by virtue of a wet process are taken as raw materials, the sodium tungstate solution and the ammoniumtungstate solution are mixed in certain proportion, heating, steaming, concentrating and drying are carried out to obtain a precursor, fine tungsten powder return scrap is added into the precursor incertain proportion, hydrogen reduction is carried out in a tubular furnace, then sodium ion is removed by virtue of ultrasonic washing, industrial spirit is used for dehydration after filtering is carried out, finally vacuum drying and screening are carried out to obtain extra-coarse tungsten powder, and the screened fine tungsten powder return scrap is recycled. The method provided by the invention has simple process equipment, low reduction temperature, short reduction time, high production efficiency and low cost, the extra-coarse tungsten powder with the granularity of 60-150Mum can be prepared, crystals are complete and are approximately spherical and have good formability, and purity is high.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular provides a method for producing ultra-coarse tungsten powder. Background technique [0002] Tungsten is widely used in modern science and technology in the form of pure metal and alloy, the most important of which is used in alloying agent of steel, tungsten-based high specific gravity alloy, tungsten carbide-based hard alloy and superalloy. Ultra-coarse tungsten powder is used to prepare alloys with high toughness and high specific gravity, such as petroleum perforating bullets, heavy armor piercing bullets, anti-missile missiles and anti-radiation materials. Ultra-coarse tungsten powder is also the raw material for preparing ultra-coarse tungsten carbide. It is mainly used to prepare coarse-grained and ultra-coarse-grained hard alloys to improve the toughness of hard alloys. It is used for drill bits for oil drilling, mining, and tunneling; it can also be used For h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
Inventor 包小倩辛延君罗骥高学绪郭志猛
Owner UNIV OF SCI & TECH BEIJING
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