Extra-coarse grain tungsten carbide powder with narrow particle size distribution and preparation method thereof

A narrow particle size distribution, tungsten carbide technology, applied in the direction of carbide, tungsten/molybdenum carbide, etc., can solve the problems of difficult to obtain high performance, poor use effect and life, wide particle size distribution, etc., to achieve high toughness, The effect of good thermal fatigue resistance and long service life

Active Publication Date: 2014-02-12
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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Problems solved by technology

The ultra-coarse tungsten carbide powder prepared by high-temperature carbonization of coarse-grained tungsten powder, thermite method, medium-temperature reduction of tungsten oxide doped with alkali metal salt, and high-temperature carbonization has a wide particle size distribution, and it is difficult for the alloy to obtain high performance, and the use effect and service life are not good.

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  • Extra-coarse grain tungsten carbide powder with narrow particle size distribution and preparation method thereof
  • Extra-coarse grain tungsten carbide powder with narrow particle size distribution and preparation method thereof

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preparation example Construction

[0025] The preparation method of the ultra-coarse tungsten carbide powder with narrow particle size distribution of the present invention comprises the following steps:

[0026] (1) High-temperature hydrogen reduction of tungsten oxide: Select tungsten oxide powder with a Fischer particle size (Fsss particle size) greater than 10 μm for high-temperature hydrogen reduction to make coarse W powder. The tungsten oxide mainly adopts WO 3 、WO 2.9 Or a mixture of the two, the high-temperature hydrogen reduction temperature ranges from 1000°C to 1300°C.

[0027] (2) Super-coarse tungsten powder hard aggregate crushing: the "hard aggregate" formed in the coarse tungsten powder is crushed, and the "hard aggregate" crushing mainly adopts at least one of stirring ball mill, rolling ball mill and jet mill.

[0028] (3) Grading of tungsten powder particle size: Classify the ultra-coarse tungsten powder after crushing by airflow or passing through a vibrating sieve to remove finer and par...

Embodiment 1

[0033] The narrow particle size distribution Fischer particle size (Fsss particle size) is 15μmWO 3 The powder was reduced at 1300°C for 3 hours to obtain coarse W powder. Put 50kg of high-purity coarse tungsten powder reduced by high temperature into the stainless steel stirring ball mill cylinder, the ball-to-material ratio is 2:1, and pass through the vibrating sieve after ball milling for 4 hours, and the Fischer particle size of 26 μm can be obtained between 200 mesh and 270 mesh sieves. Coarse tungsten powder. The resulting coarse tungsten powder was mixed with 6.17wt% carbon and ball milled for 2 hours. Then put it into a graphite boat and carbonize in a vacuum intermediate frequency induction carbonization furnace. The carbonization process parameters are 1700 ° C for 4 hours, then heat up to 2400 ° C for 3 hours, and then discharge the material after cooling to the temperature that can be released from the furnace. The obtained tungsten carbide agglomerate was crush...

Embodiment 2

[0035]The narrow particle size distribution Fischer particle size (Fsss particle size) is 10μmWO 2.9 Powder, reduced at 1000°C for 5 hours to obtain coarse W powder. Put 50kg of high-purity coarse tungsten powder reduced by high temperature into the stainless steel ball mill cylinder of the rolling ball mill, the ball-to-material ratio is 2:1, mill for 3 hours, decompose and break the "hard aggregates" in the powder, and pass through a 200 mesh screen After cyclone airflow classification, fine tungsten powder is removed to obtain coarse tungsten powder with narrow particle size distribution. The particle size of 95wt% tungsten powder is between 12 μm and 56 μm. The obtained coarse tungsten powder is mixed with carbon black, the carbon content is 6.13wt%, and then 100 kg of materials per graphite boat is loaded into a vertical intermediate frequency induction high-temperature carbonization furnace, and carbonized in a hydrogen protective atmosphere at a carbonization temperatur...

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Abstract

The invention relates to extra-coarse grain tungsten carbide powder with narrow particle size distribution and a preparation method thereof. In the tungsten carbide powder, a particle size of 80-90 weight percent of tungsten carbide powder is between 0.5D50 and 2D50, and D50 is a median diameter; the tungsten carbide powder of which the particle size is larger than 5D50 is less than 0.5 weight percent; the purity of the tungsten carbide powder is higher than or equal to 99.9 weight percent; the Fisher particle size of the tungsten carbide powder is more than or equal to 15mu m. X-ray diffraction phase analysis is performed after ball-milling and crushing treatment, and the tungsten carbide powder does not contain W2C or other mixed phases. The preparation method of the extra-coarse grain tungsten carbide powder with narrow particle size distribution comprises the following steps: performing high-temperature hydrogen reduction on tungsten oxide, crushing hard agglomerates of extra-coarse tungsten powder, carrying out size grading, carbon preparation, high-temperature carbonization, and crushing and screening the carbonized tungsten powder. An extra-coarse grain WC-Co hard alloy produced by the prepared tungsten carbide powder is uniform in organizational structure, an average grain size of a WC hard phase is coarse, and the comprehensive performance of the alloy is good.

Description

technical field [0001] The invention relates to an ultra-coarse-crystalline tungsten carbide powder with narrow particle size distribution and a preparation method thereof. Ultra-coarse-grained tungsten carbide powder with narrow particle size distribution is mainly used to prepare ultra-coarse-grained cemented carbide, and to produce new high-reliability and long-life mining tools, mining tools, rolling mill composite roll rings, high wear-resistant and impact-resistant molds, etc. Background technique [0002] The ultra-coarse WC powder raw material for ultra-coarse WC-Co cemented carbide has a series of advantages such as complete crystal structure, few structural defects, high microhardness, small microscopic strain, and certain plasticity. Good impact resistance, high temperature hardness, high thermal conductivity, small creep deformation, widely used in mining tools, oil drilling tools, coal mining machine mining tools, shield machine tools for tunnel engineering, sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34C01B32/949
Inventor 曹瑞军林晨光郭华彬郭名亮朱启伟刘小平林中坤
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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