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A method for organically preparing nano-tungsten powder with sodium tungstate

A technology of nano tungsten powder and sodium tungstate, which is applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problem of high particle size requirements of tungsten oxide, and achieve simple and easy operation of equipment, high yield, and thorough nanotechnology Effect

Active Publication Date: 2018-07-31
湖南省华京粉体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tungsten oxide reduction method has high requirements on the particle size of tungsten oxide, and nano-scale tungsten oxide is necessary to obtain nano-scale tungsten powder.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A Sodium tungstate organic

[0029] Weigh sodium tungstate, sulfuric acid and salicylic acid, use distilled water as the reaction solvent, and react at 90°C for 4 hours to obtain tungsten salicylate. The molar ratio of sodium tungstate, sulfuric acid and salicylic acid is 1:0.8:0.9. Configuration The molar concentration of tungstate ions in the aqueous solution is 1mol / L;

[0030] B Tungsten Salicylate Purification

[0031] The tungsten salicylate obtained by the reaction is washed with water to remove impurities, and water is distilled to obtain pure tungsten salicylate;

[0032] C thermal decomposition reaction

[0033] The purified tungsten salicylate is heated to 200°C and kept for 0.5 hours. During thermal decomposition, it is protected by a dry circulating argon gas. The tube furnace or box furnace is used for continuous production. The tungsten salicylate is thermally decomposed at high temperature. The decomposed steam realizes the uniform nanoization of tungsten oxide,...

Embodiment 2

[0037] A Sodium tungstate organic

[0038] Weigh sodium tungstate, sulfuric acid and salicylic acid, use distilled water as the reaction solvent, and react at 110°C for 6 hours to obtain tungsten salicylate. The molar ratio of sodium tungstate, sulfuric acid and salicylic acid is 1: 1: 0.8. Configuration The molar concentration of tungstate ions in the aqueous solution is 1.2mol / L;

[0039] B Tungsten Salicylate Purification

[0040] The tungsten salicylate obtained by the reaction is washed with water to remove impurities, and water is distilled to obtain pure tungsten salicylate;

[0041] C thermal decomposition reaction

[0042] The purified tungsten salicylate is heated to 240°C and kept for 3 hours. During thermal decomposition, it is protected by a dry circulating argon gas. The tube furnace or box furnace is used for continuous production. The tungsten salicylate is thermally decomposed at high temperature. The decomposed steam realizes the uniform nanoization of tungsten oxide...

Embodiment 3

[0046] A Sodium tungstate organic

[0047] Weigh sodium tungstate, sulfuric acid and salicylic acid, use distilled water as the reaction solvent, and react at 120°C for 8 hours to obtain tungsten salicylate. The molar ratio of sodium tungstate, sulfuric acid and salicylic acid is 1: 1.1: 1.2. Configuration The molar concentration of tungstate ions in the aqueous solution is 2mol / L;

[0048] B Tungsten Salicylate Purification

[0049] The tungsten salicylate obtained by the reaction is washed with water to remove impurities, and water is distilled to obtain pure tungsten salicylate;

[0050] C thermal decomposition reaction

[0051] The purified tungsten salicylate is heated to 330°C and kept for 8 hours. During thermal decomposition, it is protected by dry circulating argon gas, and continuous production is carried out in a tube furnace or a box furnace. Tungsten salicylate is thermally decomposed at high temperature. The decomposed steam realizes the uniform nanoization of tungsten o...

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Abstract

The invention relates to a preparation method of nano-tungsten powder, which is mainly used for preparing nano-tungsten powder by organicizing tungsten. The ratio is 1:0.8~1.2:0.8~1.2, the molar concentration of tungstate ions in the prepared aqueous solution is 1~2mol / L; tungsten salicylate is thermally decomposed into nano-tungsten oxide, the temperature is 200~340℃, and the temperature is 200~340℃, and the temperature is 0.5~ 8 hours; Nano tungsten oxide hydrogen reduced to nano tungsten powder. In the present invention, tungsten is organically formed to form tungsten salicylate with a low boiling point, which is thermally decomposed into nano-tungsten oxide at 200-300°C, and the nano-tungsten oxide is then reduced by hydrogen to obtain nano-tungsten powder with uniform particle size, and the particle size of nano-tungsten powder is 20-40nm , the purity is 99.99%, and the yield exceeds 99%. The invention has the outstanding advantages of simple operation, clean and environment-friendly.

Description

Technical field [0001] The invention relates to a preparation method of nano tungsten powder. It is obtained by thermal reaction of sodium tungstate and salicylic acid to obtain molybdenum salicylate, purified by water washing, and thermally decomposed to obtain nano-tungsten oxide, and then subjected to hydrogen reduction to obtain nano-tungsten powder, which is used in military, aerospace, medicine and other fields. technical background [0002] Tungsten has high density, high melting point, high hardness, high wear resistance, low thermal expansion coefficient, excellent electrical and thermal conductivity and good corrosion resistance, and has been widely used in many fields. Nano cemented carbide exhibits superior properties such as high strength, high toughness, and high hardness that conventional materials cannot match due to its nano grain structure. To produce nano-sized cemented carbide, the first prerequisite is to prepare nano-sized WC powder, and the prerequisite fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B82Y40/00
CPCB82Y40/00B22F9/22B22F2999/00B22F1/054B22F2201/013
Inventor 李焌源薛海涛李春芳吴尔京罗小媚牛博
Owner 湖南省华京粉体材料有限公司
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