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Preparation method of ultrafine tungsten carbide powder

A technology of ultra-fine tungsten powder and tungsten carbide powder, which is applied in the direction of carbide, tungsten/molybdenum carbide, etc., can solve the problems of unfavorable mass production, high production cost, and complicated equipment, so as to improve the effect and increase the combined carbon content , the effect of uniform particle size distribution

Active Publication Date: 2013-11-27
ZHUZHOU HARD ALLOY GRP CO LTD
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AI Technical Summary

Problems solved by technology

The main disadvantage is that the equipment is complex and the production cost is high, which is not conducive to mass production

Method used

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  • Preparation method of ultrafine tungsten carbide powder
  • Preparation method of ultrafine tungsten carbide powder
  • Preparation method of ultrafine tungsten carbide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Follow the steps below to superfine tungsten carbide powder:

[0026] (1) According to the following mass percentages, the ultrafine tungsten powder is 88.90% (BET particle size is 0.05μm), carbon black is 6.10%, and ultrafine tungsten carbide is 5% (BET particle size is 0.15μm). The oxygen content in the powder, the mass percentage of carbon black is 0.3% higher than the mass percentage of carbon calculated according to the WC stoichiometric ratio [that is, 6.10%-88.90% × (12 / 183.85) value is 0.3%], the above proportion of powder Put the materials into the ball mill, add stainless steel grinding balls, and then ball mill and mix for 8 hours to mix the materials evenly.

[0027] (2) Unload the mixed materials of the ball mill from the ball mill, and separate the balls, then put the materials into the graphite boat and carbonize in the carbonization furnace. The carbonization atmosphere is a non-oxidizing atmosphere, and the carbonization temperature is 1000°C. , ...

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Abstract

The invention relates to a preparation method of ultrafine tungsten carbide powder. A mixture of ultrafine tungsten powder, carbon black and ultrafine tungsten carbide powder used as an initial reactant is subjected to carbonization reaction in a non-oxidizing atmosphere to prepare the ultrafine tungsten carbide powder. The ultrafine tungsten carbide powder prepared by the method has the advantages of small particle size, uniform particle size distribution, favorable dispersity, no pellet and high combined carbon content; and the production technique can easily control the quality and can implement mass production.

Description

Technical field [0001] The invention relates to a preparation method of ultrafine tungsten carbide powder, which belongs to the research field of tungsten carbide-based hard alloys. Background technique [0002] Tungsten carbide powder is an essential raw material for the preparation of tungsten carbide-based cemented carbide. The size and distribution of tungsten carbide grains in the cemented carbide have an important impact on the properties of the alloy. When the tungsten carbide grain size in the cemented carbide decreases to After micron level and nano level, the hardness and flexural strength of the material have been significantly improved, and the toughness has also been significantly improved. It is called "double high" cemented carbide. The preparation of tungsten carbide powder with fine grains, good dispersibility, uniform particle size distribution, and high compound carbon content is the key technology for preparing ultrafine cemented carbide. The current methods ...

Claims

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Application Information

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IPC IPC(8): C01B31/34C01B32/949
Inventor 陆必志颜练武施超波
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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