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A kind of preparation method of superfine tungsten powder composite powder

A technology of composite powder and ultra-fine tungsten powder, which is applied in the field of preparation of ultra-fine tungsten powder composite powder, can solve the problems of unsuitability for large-scale industrial production, uneven powder properties, and difficulty in continuous production, etc. The effect of environmental protection process, stable reaction and low product cost

Active Publication Date: 2020-12-08
湘潭新云科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of preparing tungsten powder has the following problems: 1. The product has low purity and is difficult to produce continuously; 2. The equipment used is complicated and not suitable for large-scale industrial production; 3. The energy consumption is large, and the prepared tungsten powder has large particles. Powder performance is uneven

Method used

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  • A kind of preparation method of superfine tungsten powder composite powder
  • A kind of preparation method of superfine tungsten powder composite powder
  • A kind of preparation method of superfine tungsten powder composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Heat deionized water or distilled water to 62°C; then add ammonium metatungstate, ammonium molybdate, lanthanum nitrate and ammonium metavanadate in sequence, the addition amount is 14g / L, 0.5g / L, 0.02g respectively / L and 0g / L, stir to dissolve completely and continue to stir for 0.5h; continue to heat until boiling and evaporation to obtain tungsten trioxide precursor powder;

[0028] 2) Put the ultra-fine tungsten trioxide composite powder in a tube furnace, pass in hydrogen gas, and reduce to obtain tungsten powder; place the tungsten powder in a high-temperature reaction furnace, and fully oxidize the tungsten trioxide composite powder; put tungsten trioxide Powder --- tungsten powder --- tungsten trioxide powder The process is repeated 5 times to obtain small particles of tungsten trioxide composite powder;

[0029] 3) Put small particles of tungsten trioxide composite powder in a planetary ball mill, ball mill for 4 hours, and the rotation speed is 200r / min, t...

Embodiment 2

[0033] 1) Heat deionized water or distilled water to 65°C; then add ammonium metatungstate, ammonium molybdate, ammonium nitrate and ammonium metavanadate in sequence, the addition amount is 17g / L, 0.8g / L, 0.05g respectively / L and 0.2g / L, stir to dissolve completely and continue to stir for 1h; continue to heat until boiling and evaporation to obtain tungsten trioxide precursor powder;

[0034] 2) Put the tungsten trioxide composite powder in a tubular furnace, pass in hydrogen gas, and reduce to obtain tungsten powder; place the tungsten powder in a high-temperature reaction furnace, and fully oxidize the tungsten trioxide composite powder; put the tungsten trioxide powder ------Tungsten powder------Tungsten trioxide powder The process is repeated 3 times to obtain small particles of tungsten trioxide composite powder;

[0035] 3) Put small particles of tungsten trioxide composite powder in a planetary ball mill, ball mill for 3 hours, and the rotation speed is 300r / min to o...

Embodiment 3

[0039] 1) Heat deionized water or distilled water to 70°C; then add ammonium metatungstate, ammonium molybdate, lanthanum nitrate and ammonium metavanadate in sequence, the addition amount is 15g / L, 0.6g / L, 0.05g respectively / L and 0.1g / L, stir to dissolve completely and continue to stir for 0.7h; continue to heat until boiling and evaporation to obtain tungsten trioxide precursor powder;

[0040] 2) Put the tungsten trioxide composite powder in a tubular furnace, pass in hydrogen gas, and reduce to obtain tungsten powder; place the tungsten powder in a high-temperature reaction furnace, and fully oxidize the tungsten trioxide composite powder; put the tungsten trioxide powder ------Tungsten powder------Tungsten trioxide powder The process is repeated 4 times to obtain small particles of tungsten trioxide composite powder;

[0041]3) Put the small-particle tungsten trioxide composite powder in a planetary ball mill, mill for 4 hours, and the rotation speed is 250r / min to obta...

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Abstract

The invention relates to a preparation method of ultrafine tungsten powder composite powder. The method comprises the steps that ammonium metatungstate powder, ammonium molybdate, a lanthanum nitrate hexahydrate compound and ammonium metavanadate are taken as raw materials, the raw materials are dissolved into deionized water or distilled water, uniform stirring is conducted, and a solution is prepared; the solution is heated and dried by distillation, and tungsten trioxide powder with large precursor particles is obtained; and tungsten trioxide composite powder with the average particle size smaller than 100 nm is obtained through multiple times of repeated oxidation-reduction process and ball milling and crushing, and then the ultrafine tungsten composite powder is prepared. The method has the characteristics that the prepared nanoscale tungsten composite powder is high in purity and fine and uniform in particle, and the reaction process is steady. In addition, the ultrafine tungsten powder composite powder is easy to control and simple in preparation process, therefore, the production technology is simple and convenient to operate, the product cost is low, industrialized production investment is low, and industrialized batch production is convenient to achieve.

Description

technical field [0001] The invention belongs to the field of tungsten powder preparation, in particular to a preparation method of ultrafine tungsten powder composite powder. Background technique [0002] The main raw material for processing powder metallurgy tungsten products and tungsten alloys is tungsten powder. Some processing materials such as plates, tubes, rods and wires and products of specific shapes are made of pure tungsten powder. Various tungsten alloys can be prepared by mixing other metal powders with tungsten powder, such as tungsten-copper alloy, tungsten-rhenium alloy, tungsten-molybdenum alloy and high-density tungsten alloy. Tungsten carbide powder is also another important use of tungsten powder, which is further made into cemented carbide tools such as molds, milling cutters, turning tools and drills. Due to the rapid development of microelectronics industry, machinery industry, aviation, energy and other fields, the demand for ultra-fine tungsten po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22
CPCB22F9/22B22F2999/00B22F2201/11
Inventor 郭世柏郭涛胡涛蔡春波
Owner 湘潭新云科技有限责任公司
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