Method for preparing nano-stage tungsten carbide powder

A technology of tungsten carbide powder and nano-tungsten powder, applied in nanostructure manufacturing, carbide, nanotechnology and other directions, can solve the problems of difficult control of total carbon content, long process flow, large equipment investment, etc., and achieve product quality and stability. The effect of improvement, short process flow and low investment

Active Publication Date: 2008-09-17
XIAMEN GOLDEN EGRET SPECIAL ALLOY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have long process flow, large equipment investment, low production capacity, high energy consumption, difficult control of total carbon content, low combined carbon content, low purity, poor product qual

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, the preparation method of a kind of nano-scale tungsten carbide powder of the present invention is to use nano-tungsten powder and nano-carbon black as raw materials, put nano-tungsten powder and nano-carbon black into a container, and pass inert gas into the container , Stir and mix nano-tungsten powder and nano-carbon black under the protection of an inert gas, add a certain amount of organic active materials such as paraffin during the mixing process, and after mixing evenly, press it into a block under a certain pressure, calcined the block, Combining nano-tungsten powder and nano-carbon black in the compact to form tungsten carbide (WC), the chemical reaction formula is as follows:

[0021] W+C=WC

[0022] After the tungsten carbide (WC) is formed, a high-pressure inert dry gas is introduced into the container, and the tungsten carbide (WC) is ground and dispersed by a closed-loop airflow grinding method to form nano-sized tungsten carbide powder.

...

Embodiment 2

[0029] Embodiment 2, the preparation method of a nanoscale tungsten carbide powder of the present invention uses 0.1 μm nano-tungsten powder, nano-carbon black and paraffin as raw materials, and accurately measures the combined oxygen content of the nano-tungsten powder during preparation. according to

[0030] W+C=WC..........(1) and

[0031] o 2 +2C→2CO......(2)

[0032] Calculate the weight of the nano-tungsten powder and the carbon powder (the oxygen referred to in equation 2 is the chemical oxygen of the nano-tungsten powder). Put the required amount of nano-tungsten powder and nano-carbon black into the high-efficiency stirring mixer, and pass an inert gas into the high-efficiency stirring mixer, such as nitrogen gas, and mix the nano-tungsten powder and nano-carbon under the protection of the inert gas. Black is stirred and mixed, and organic active material paraffin wax based on nano-tungsten powder and nano-carbon black addition amount of 1.8% is added during the m...

Embodiment 3

[0035] Embodiment 3, the preparation method of a nanoscale tungsten carbide powder of the present invention uses 0.15 μm nano-tungsten powder and nano-carbon black as raw materials, and accurately measures the combined oxygen content of the nano-tungsten powder during preparation. according to

[0036] W+C=WC..........(1) and

[0037] o 2 +2C→2CO......(2)

[0038] Calculate the weight of the nano-tungsten powder and the carbon powder (the oxygen referred to in equation 2 is the chemical oxygen of the nano-tungsten powder). Put the required amount of nano-tungsten powder and nano-carbon black into the high-efficiency stirring mixer, and pass an inert gas into the high-efficiency stirring mixer, such as nitrogen gas, and mix the nano-tungsten powder and nano-carbon under the protection of the inert gas. Black is stirred and mixed, and the organic active material polyethylene glycol (PEG) based on nano-tungsten powder and nano-carbon black addition 3% is added in the mixing pr...

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Abstract

The invention discloses a nano-tungsten carbide powder (particle size is less than or equal to 0.2Mum, carbon compound Cc is more than or equal to 6.10%) preparation method. The preparation takes nano-tungsten (particle size is less than or equal to 0.2Mum) powder and nano-carbon black as materials and comprises a plurality of steps: put the nano-tungsten powder and nano-carbon black into a container; pass the inert gas in the container and mix and stir nano-tungsten powder and nano-carbon black in a state of inert gas the protection; in mixing, add 0.5-3% organic and active materials; after the mixed powder is uniformly mixed, press the mixed powder into pieces under the pressure of 500kg/cm2 -- 1500kg/cm 2 and calcine the pressed pieces (W+C) to make the nano-tungsten powder and tungsten carbide nano-carbon black form tungsten carbide(WC); after the formation of tungsten carbide(WC), adopt the method of airflow grinding to grind and break up the tungsten carbide into nano-tungsten carbide powder. The method has advantages of short technological process, small investment, high yield and great improvement for production quality and stability and is an environment-friendly preparation method.

Description

technical field [0001] The invention belongs to metal smelting technology, and in particular relates to a method for preparing high-performance nanoscale tungsten carbide powder (particle size≤0.2 micron, combined carbon Cc≥6.10%) on an industrial scale. Background technique [0002] Tungsten is one of the most refractory metals, with a melting point as high as 3410°C. It has high hardness, strong ductility, and is not eroded by air at room temperature. Because of these characteristics of tungsten, tungsten powder can be used in a wide range of applications. For example, it can be used to prepare heavy alloy. It is used in automatic watch pendulums, telecommunication vibrators, aircraft balance boards, anti-x-rays, alpha-rays, gamma-ray protection boards, etc.; it can also be used in the preparation of electrical alloys, such as high-voltage contacts, etc. Tungsten carbide powder is an important raw material for making alloys. Cemented carbide prepared from tungsten carbide...

Claims

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Application Information

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IPC IPC(8): C01B31/34B82B3/00C01B32/949
Inventor 吴冲浒林高安吴其山吴高潮
Owner XIAMEN GOLDEN EGRET SPECIAL ALLOY
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