Prepn process of nano level tungsten powder and WC powder

A nano-scale, tungsten carbide technology, applied in the direction of tungsten/molybdenum carbides, carbides, etc., can solve the problems of reducing the mechanical properties and physical properties of pure tungsten materials, pressure processing performance, etc., to achieve easy addition, narrow particle size distribution, particle size uniform effect

Inactive Publication Date: 2005-04-27
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Such coarse tungsten grains significantly reduce the mechanical properties, physical properties, and pressure processing properties of pure tungsten materials.

Method used

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  • Prepn process of nano level tungsten powder and WC powder

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Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, when preparing 10kg nanometer W powder and 10.652kg nanometer WC powder, should complete according to the following steps

[0036] 1. Preparation of nano-WO 3 powder

[0037] Weigh 34.08 liters of high-concentration ammonium tungstate solution, its WO 3 The content is 370g / liter, using the supersonic spray heat transfer method at an air jet pressure of 3.5MPa and a jet speed of 700m s -1 , The spray angle of the nozzle α=45°, the focal length F=13mm, according to 350ml / min, the liquid flow delivery speed is 320ml / min, the hot air temperature is 350°C, and the countercurrent hot air drying is used to make 12.61kg nano-scale WO 3 Powder, average particle size ≤50nm.

[0038] 2. H 2 Preparation of loose and porous blue tungsten powder by reduction

[0039] Use a stainless steel tubular reduction furnace at 500°C for 60 minutes, H 2 Gas section flow rate 20ml / cm 2 . Minutes, reduced to make loose porous blue tungsten powder, the average particle size ≤ ...

Embodiment 2

[0061] Embodiment 2: when preparing 1kg nanometer W powder and 1.0652kg nanometer WC powder, should finish according to the following steps:

[0062] 1. Weigh 3.6 liters of high-concentration ammonium tungstate solution, its WO 3 The content is 350g / liter, the air injection pressure is 2.5MPa, and the injection velocity is 650m·s -1 , Hot air temperature 250 ℃ countercurrent hot air drying, supersonic spray heat transfer method to make nano-scale WO 3 powder. The injection angle α=45 ° of nozzle, focal length F=13mm, by 280ml / min liquid flow conveying speed, make 1.26kg nanoscale WO 3 Powder, average particle size ≤50nm.

[0063] 2. H 2 Preparation of loose and porous blue tungsten powder by reduction

[0064] Stainless steel tubular reduction furnace 420°C, H 2 Gas section flow rate 20ml / cm 2 . Divide, keep warm for 80 minutes, and reduce to make loose and porous blue tungsten powder, with an average particle size of ≤40nm.

[0065] 3, 4, are exactly the same as 3, 4 ...

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Abstract

The present invention provides the preparation process of nanometer level W powder and WC powder. WO3 powder is first prepared through supersonic spraying and heat conversion process with air of 250-300 deg.c and 2.5-3.5 MPa. WO3 powder is then reduced with H2 into WO2.9 powder, and prepared into coated nanometer WO2.9 powder via high speed interlaminar shearing, coating, grading, depositing and stoving. Through low temperature reduction at 700-750 deg.c inside a reducing furnace with H2 introduced, W powder of average size smaller than 80 nm is obtained. The nanometer W powder is mixed with nanometer carbon black powder and organic isolating agent, and nanometer WC powder of average particle size smaller than 90 nm is prepared through further centrifugal drying, carbonization at 980-1000 deg.c for 60-80 min.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-melting point metal tungsten powder and tungsten carbide powder thereof, and in particular provides a preparation method of nano-scale ultrafine tungsten powder and nano-scale tungsten carbide powder, which is suitable for nano-tungsten powder and nano-tungsten carbide powder of industrial production. Background technique [0002] The melting point of metal tungsten is as high as 3410°C, ranking first among all metals. What's more valuable is that its boiling point is 5527°C and its heat of evaporation is 799.4 (J / ml), which is unmatched by any metal. This feature determines that metal tungsten can be the best material used under high temperature and ultra-high temperature conditions, so metal tungsten is widely used to make various incandescent filaments, ultra-high temperature electric heating elements, and ultra-high temperature heat-resistant parts, etc., such as Various electric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/00C01B32/949
Inventor 吴成义张丽英
Owner UNIV OF SCI & TECH BEIJING
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