Uniform macromeritic tungsten powder and method for preparing tungsten carbide powder

A coarse-grained, tungsten carbide technology, used in the field of refractory metal smelting, can solve the problems of many distorted grains, poor grain shape, and poor crystallization.
CN101664809AActive Publication Date: 2010-03-10ZHUZHOU HARD ALLOY GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHUZHOU HARD ALLOY GRP CO LTD
Publication Date
2010-03-10

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Abstract

The invention discloses a uniform macromeritic tungsten powder and a method for preparing macromeritic tungsten carbide powder. During reduction, water vapor and hydrogen or a mixture thereof is sentinto a reducing furnace, and tungsten oxide powder materials or mixture materials of tungsten oxide powder and tungsten powder, which are pushed into the reducing furnace, are reduced to metallic tungsten powder by controlling the partial pressure ratio (PH2O / PH2) of the water vapor and the hydrogen sent into the reducing furnace and the temperature of the furnace. By the adjustment of technological parameters, macromeritic tungsten powder of multiple grades in the range of 10-100 micrometers can be prepared. The prepared macromeritic tungsten powder has the advantages of comparatively uniformgranularity, integrated crystallization, attractive appearance and high purity. After the carbonization of the macromeritic tungsten powder, uniform macromeritic tungsten carbide powder of 12-115 micrometers can be prepared. The invention can be used for producing macromeritic and super macromeritic hard alloy products of more than 4 micrometers and can be also used for the surface spray coating,the spray welding and the like of hard-surface materials.
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Description

technical field

[0001] The invention belongs to the refractory metal smelting technology, and relates to a preparation method of uniform coarse-grain tungsten powder and a method for preparing coarse-grain tungsten carbide powder by using the coarse-grain tungsten powder. Uniform coarse-grained tungsten powder and tungsten carbide powder are mainly used in the preparation of coarse-grained and ultra-coarse-grained hard alloys, the production of mining tools, stamping dies, drilling and mining tools, and can also be used in hard surface materials such as spraying and spray welding. Background technique

[0002] Coarse-grained tungsten carbide is used in the production of cemented carbide because of its good crystallization properties, few structural defects, large sub-grain size, high microhardness, small microscopic strain, and certain plasticity. The fracture (impact) toughness of cemented carbide improves the service life and is widely used. Therefore, tungsten carbide po...

Claims

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