Method for preparing nanometer tungsten powder by organizing sodium tungstate

A technology of nano-tungsten powder and sodium tungstate, 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 low reaction temperature. Effect

Active Publication Date: 2017-05-10
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 tu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A sodium tungstate organic

[0030] Weigh sodium tungstate, sulfuric acid and salicylic acid, use distilled water as the reaction solvent, 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, configure The molar concentration of tungstate ions in the aqueous solution is 1mol / L;

[0031] B Tungsten Salicylate Purification

[0032] The tungsten salicylate obtained by the reaction is washed with water to remove impurities, and the water is distilled to obtain pure tungsten salicylate;

[0033] C thermal decomposition reaction

[0034] Raise the temperature of purified tungsten salicylate to 200°C, keep it warm for 0.5 hours, use dry circulating argon protection during thermal decomposition, and use tube furnace or box furnace for continuous production. Tungsten salicylate is thermally decomposed at high temperature. The decomposed steam realizes uniform and nano-sized tungsten oxide,...

Embodiment 2

[0038] A sodium tungstate organic

[0039] Weigh sodium tungstate, sulfuric acid and salicylic acid, use distilled water as the reaction solvent, 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, configure The molar concentration of tungstate ions in the aqueous solution is 1.2mol / L;

[0040] B Tungsten Salicylate Purification

[0041] The tungsten salicylate obtained by the reaction is washed with water to remove impurities, and the water is distilled to obtain pure tungsten salicylate;

[0042] C thermal decomposition reaction

[0043] Raise the temperature of the purified tungsten salicylate to 240°C, keep it warm for 3 hours, use dry circulating argon protection during thermal decomposition, and use tube furnace or box furnace for continuous production. Tungsten salicylate is thermally decomposed at high temperature, The decomposed steam realizes uniform and nano-sized tungsten ox...

Embodiment 3

[0047] A sodium tungstate organic

[0048] Weigh sodium tungstate, sulfuric acid and salicylic acid, use distilled water as the reaction solvent, 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, configure The molar concentration of tungstate ions in the aqueous solution is 2mol / L;

[0049] B Tungsten Salicylate Purification

[0050] The tungsten salicylate obtained by the reaction is washed with water to remove impurities, and the water is distilled to obtain pure tungsten salicylate;

[0051] C thermal decomposition reaction

[0052] Raise the temperature of the purified tungsten salicylate to 330°C, keep it warm for 8 hours, use dry circulating argon protection during thermal decomposition, and use tube furnace or box furnace for continuous production. Tungsten salicylate is thermally decomposed at high temperature. The decomposed steam realizes uniform and nano-sized tungsten o...

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Abstract

The invention relates to a preparation method of nanometer tungsten powder, which is mainly used for preparing the nanometer tungsten powder by organizing tungsten. The method comprises the following steps: organizing sodium tungstate into tungsten salicylate, wherein the molar ratio of the sodium tungstate to sulfuric acid to salicylic acid is 1:(0.8-1.2):(0.8-1.2), and the molar concentration of tungstate ions in the prepared aqueous solution is 1 to 2 mol/L; performing thermal decomposition on the tungsten salicylate to obtain nanometer tungsten oxide, wherein the temperature is 200 to 340 DEG C and is preserved for 0.5 to 8 hours; and performing hydrogen reduction on the nanometer tungsten oxide to obtain the nanometer tungsten powder. The tungsten salicylate with low boiling point is formed by organizing the tungsten and then is subjected to thermal decomposition at 200 to 300 DEG C to form the nanometer tungsten oxide, the nanometer tungsten oxide is subjected to hydrogen reduction to obtain the nanometer tungsten powder with uniform granularity, the granularity of the nanometer tungsten powder is 20 to 40 nm, the purity of the nanometer tungsten powder is 99.99 percent, and the yield of the nanometer tungsten powder exceeds 99 percent. The method has the prominent advantages of simplicity in operation, cleanness and environmental friendliness.

Description

technical field [0001] The invention relates to a preparation method of nanometer tungsten powder. It obtains molybdenum salicylate through the thermal reaction of sodium tungstate and salicylic acid, purifies by water washing, undergoes thermal decomposition to obtain nano-tungsten oxide, and then obtains nano-tungsten powder through hydrogen reduction, which is used in military industry, aerospace, medicine and other fields. [0002] technical background [0003] 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. Due to its nano-grain structure, nano-cemented carbide exhibits superior properties such as high strength, high toughness, and high hardness that conventional materials cannot match. The prerequisite for producing nano-tungsten carbide is to prepare nano-scale WC powder, and the pr...

Claims

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Application Information

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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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