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Method for preparing nanopowder of tungsten carbide

A nano-tungsten carbide and nano-technology, which is applied in the field of preparation of nano-tungsten carbide powder, can solve the problem of violent growth of nano-scale tungsten oxide or tungsten powder particles, and achieve the effect of simple equipment and low cost

Inactive Publication Date: 2006-10-11
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of nano-tungsten carbide powder, which solves the problem of violent particle growth of nano-scale tungsten oxide or tungsten powder in the carbonization process

Method used

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  • Method for preparing nanopowder of tungsten carbide
  • Method for preparing nanopowder of tungsten carbide

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: The W powder with an average particle diameter of 60.6nm is used as a raw material to prepare WC powder with an average particle diameter of 87.9nm, which should be completed according to the following steps.

[0020] 1. Dissolve the alcohol-soluble phenolic resin in absolute ethanol, configure it as an ethanol solution of 0.5g / ml phenolic resin, add 300ml of the above-mentioned phenolic resin ethanol solution to each kg of nano W powder, and process it in an ultrasonic dispersion device for 3 hours. Stir at the same time, and then heat the slurry to 100° C. to volatilize absolute ethanol to obtain a mixture of phenolic resin-coated nanometer W particles.

[0021] 2. Carbonize the mixture in a vacuum furnace at a temperature of 950° C. for 60 minutes and a vacuum of 200 Pa to obtain nano WC powder with an average particle size of 85.5 nm and a total carbon content of 8.13%.

[0022] 3. The nano-WC powder with high carbon content obtained by vacuum carboniz...

Embodiment 2

[0024] Embodiment 2: The W powder with an average particle diameter of 48.5nm is used as a raw material to prepare WC powder with an average particle diameter of 75.4nm, which should be completed according to the following steps.

[0025] 1. Dissolve the alcohol-soluble phenolic resin in absolute ethanol, configure it as an ethanol solution of 0.8g / ml phenolic resin, add 250ml of the above-mentioned phenolic resin ethanol solution in every kg of nano W powder, and process it in an ultrasonic dispersion device for 5 hours, Stir at the same time, and then heat the slurry to 90° C. to volatilize absolute ethanol to obtain a mixture of nano W particles coated with phenolic resin.

[0026] 2. Carbonize the mixture in a vacuum furnace at a temperature of 910° C. for 120 minutes and a vacuum of 300 Pa to obtain nano WC powder with an average particle size of 73.8 nm and a total carbon content of 9.47%.

[0027] 3. The nano-WC powder with high carbon content obtained by vacuum carboni...

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Abstract

The invention relates to a method for preparing nanometer tungsten carbide, belonging to field of preparing nanometer metallic carbide powder. The method employs formaldehyde-phenol resin as carbon source and demolding agent, and prepares mixture of nanometer W particle covered by formaldehyde-phenol resin, then gets nanometer WC powder through vacuum carbonization, and finally removes free carbon through heating treatment in hydrogen atmosphere. The invention is characterized by fine and homogenous WC powder, simple process and device and low cost.

Description

technical field [0001] The invention belongs to the technical field of nanometer metal carbide powder preparation, and in particular provides a preparation method of nanometer tungsten carbide powder. Background technique [0002] Cemented carbide has high hardness and flexural strength, excellent high temperature resistance and corrosion resistance, and is an indispensable tool material in machinery manufacturing, mining, oil extraction, electronics, computers and other industries. In recent decades, the performance of materials used in aerospace, automotive and other industries has been continuously improved, and the use of lightweight and tough materials is increasing, and the processing difficulty is increasing. At the same time, in order to improve efficiency and reduce costs in the modern machining industry, cutting The speed continues to increase, which makes the modern material processing industry require a tool material with excellent comprehensive mechanical proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/949C22C29/08
Inventor 郭志猛罗骥林涛郝俊杰
Owner UNIV OF SCI & TECH BEIJING
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