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 high production cost, complicated equipment, unfavorable batch production, etc., and achieve improved effect, uniform particle size distribution, The effect of improving uniformity

Active Publication Date: 2015-02-04
ZHUZHOU HARD ALLOY GRP CO LTD
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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] Embodiment 1: superfine tungsten carbide powder according to the following steps:

[0026] (1) According to the following mass percentage, 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). 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, the value of 6.10%-88.90%×(12 / 183.85) is 0.3%], the above proportion of powder Put the materials into a ball mill, add stainless steel balls, and then ball mill and mix for 8 hours to mix the materials evenly.

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

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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 cemented carbide. 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 cemented carbide have an important impact on the properties of the alloy. When the grain size of tungsten carbide in cemented carbide is reduced to After the micron level and nano level, the hardness and bending strength of the material are significantly improved, and the toughness is also significantly improved, which is called "double high" cemented carbide. Preparation of tungsten carbide powder with fine grain, good dispersion, uniform particle size distribution and high combined carbon content is the key technology for preparing ultrafine cemented carbide. At present, the methods for pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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