Manufacturing method of ultra coarse-grain tungsten carbide powder

A technology of tungsten carbide powder and manufacturing method, which is applied in the direction of carbide, tungsten/molybdenum carbide, etc., can solve the problem of not being able to meet the requirements for the production and application of ultra-coarse-grained or ultra-coarse-grained hard alloys, and inherit the quality of original tungsten powder Defects, increased content of harmful impurities such as iron, etc., to achieve the effect of favorable growth and perfection, perfect crystal development, and low content of harmful impurities

Inactive Publication Date: 2012-10-03
XIAMEN TUNGSTEN +1
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  • Abstract
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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

Method used

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  • Manufacturing method of ultra coarse-grain tungsten carbide powder

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Embodiment Construction

[0016] Preferred embodiment of the present invention.

[0017] First, mix and stir the ultra-coarse crystalline tungsten powder in the carbon dispenser, which is a "mixer for preparing tungsten carbide powder" with the patent number of 03253385.3; then mix the tungsten-carbon with carbon The material is sent to the carbonization equipment, which is heated by medium frequency induction to carry out ultra-high temperature carbonization above 2200 °C.

[0018] The following is a comparison of the grain size of tungsten carbide powder raw materials with different grain sizes, and the ultra-coarse grain tungsten carbide powder produced by the traditional process and the process of the present invention.

[0019]

[0020] It can be seen from the table that the process of the present invention makes the crystal development perfect, and the grain size of the tungsten carbide powder is greatly increased, exceeding 5.5 μm.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34C01B32/949
Inventor 吴冲浒林高安吴其山吴高潮高观金黄家明
Owner XIAMEN TUNGSTEN
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