Manufacturing method of ultra coarse-grain tungsten carbide powder

Abstract

The invention discloses a manufacturing method of ultra coarse-grain tungsten carbide powder, which comprises the following steps: stirring and mixing ultra coarse-grain tungsten powder in a carbon addition device for carbon addition; delivering a tungsten-carbon mixture with added carbon into a carbonization device, performing superhigh-temperature carbonization at above 2200 DEG C by intermediate frequency induction heating. The production method can improve the original grain size of tungsten carbide powder. The produced tungsten carbide powder has an original grain size of more than 5.5 microns, and has improved crystal development.

Description

technical field [0001] The invention relates to a method for manufacturing ultra-coarse tungsten carbide powder. Background technique [0002] The traditional production method of coarse-grained tungsten carbide powder is to add Li + or add Na + The reduced coarse tungsten powder is mixed with carbon by rolling ball milling in an ordinary carbon distributor, and then heated by electricity in an ordinary carbon tube for long-term carbonization at high temperature (1800 ° C ~ 2000 ° C). There are following obvious defects in this method: [0003] (1) with Li + or add Na + The coarse tungsten powder produced by reduction method has obvious defects in its crystal structure, and there are a large number of pseudomorphic structures. + , Na + Such harmful impurity elements, the coarse crystalline tungsten carbide powder produced by this type of tungsten powder will inherit the quality defects of the original tungsten powder; [0004] (2) The traditional carbon blending metho...

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Problems solved by technology

[0003] (1) with Li + or add Na + The crude tungsten powder produced by reduction method has obvious defects in its crystal structure, and there are a large number of pseudomorphic structures. + , Na + Such harmful impurity elements, the coarse crystalline tungsten carbide powder produced by this type of tungsten powder will inherit the quality defects of the original tungsten powder;

[0004] (2) The traditional carbon mixing method is rolling ball mill carbon mixing, which has high equipment cost, low efficiency, and high energy consumption; and it will cause an increase in the content of harmful impurities such as iron, which will damage product quality

Unable to meet the production and application requirements of ultra-coarse-grained or extra-coarse-grained cemented carbide

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