Narrow-particle size distribution extra-coarse cemented carbide and preparation method thereof

A technology of narrow particle size distribution and cemented carbide, which is applied in the field of ultra-coarse cemented carbide with narrow particle size distribution and its preparation, can solve the problems of easy pollution of the environment, difficulty in obtaining high-performance ultra-coarse cemented carbide, and wide particle size distribution. Uniform particle size distribution, good thermal fatigue resistance, and uniform distribution of bonding phase

Active Publication Date: 2014-06-18
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Domestic patents do not control the particle size distribution of tungsten carbide grain size in ultra-coarse cemented carbide, and the prepared alloy WC has a wide particle size distribution, making it difficult to obtain high-performance ultra-coarse cemented carbide
The US patent regulates the particle size distribution of WC, but chemical coating of cobalt is used, and the cobalt coating process is easy to pollute the environment

Method used

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  • Narrow-particle size distribution extra-coarse cemented carbide and preparation method thereof
  • Narrow-particle size distribution extra-coarse cemented carbide and preparation method thereof

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preparation example Construction

[0020] The preparation method of the ultra-coarse-grained cemented carbide with narrow particle size distribution of the present invention comprises the following steps:

[0021] 1) Breaking of hard aggregates of ultra-coarse tungsten carbide powder: put ultra-coarse tungsten carbide powder with a Fischer particle size of 20 μm or more into a stirring ball mill or rolling ball mill, and perform ball milling to break the "hard aggregates" of WC powder.

[0022] 2) Particle size classification of tungsten carbide powder: the ultra-coarse tungsten carbide powder crushed by the ball mill is classified by airflow classification or passing through a vibrating sieve to remove finer and particularly coarse tungsten carbide powder particles, and obtain the average particle size required for subsequent processes. Ultra-coarse tungsten carbide powder in particle size and particle size distribution.

[0023] 3) Cobalt coating by magnetron sputtering of tungsten carbide powder: put the gra...

Embodiment 1

[0029] The WC powder with a Fsss particle size of 20 μm and a carbon content of 6.17% was ball milled in a rolling ball mill for 16 hours to deagglomerate, with a ball-to-material ratio of 3:1; then air classification to remove finer and particularly coarse tungsten carbide powder particles, Obtain 90wt% tungsten carbide powder with a narrow particle size distribution of tungsten carbide powder with a particle size between 3.5 μm and 14 μm; put the tungsten carbide powder into a magnetron sputtering coating machine for cobalt plating, and increase the quality of the powder by 1% by cobalt plating ;The cobalt-coated WC, paraffin wax and 5wt% cobalt powder were wet-mixed in a rolling ball mill, and a small amount of cemented carbide grinding balls were added during the wet-mixing. The ball-to-material ratio was 1:1, and the wet-mixing time was 36 hours; Finally, dry in a vacuum oven at 80°C to remove alcohol and pass through a 80-mesh sieve, then mold the powder at 200 MPa. The ...

Embodiment 2

[0032]The WC powder with a Fsss particle size of 30 μm and a carbon content of 6.16% was ball milled in a stirring mill for 4 hours to deagglomerate, and the ball-to-material ratio was 3:1; then air classification was performed to remove finer and particularly coarse tungsten carbide particles, Obtain 90wt% tungsten carbide powder with a narrow particle size distribution of tungsten carbide powder with a particle size between 6 μm and 24 μm; then put the tungsten carbide powder into a magnetron sputtering coating machine for cobalt plating, and increase the quality of the powder by 2% by cobalt plating ;The cobalt-coated WC, PEG and 12wt% cobalt powder are wet-mixed in a rolling ball mill, and a small amount of cemented carbide grinding balls are added during the wet-mixing. The ball-to-material ratio is 1:5, and the wet-mixing time is 16 hours; mix well After that, the alcohol was removed by spray drying, and then the powder was isostatically pressed at 200MPa. The product is...

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Abstract

The invention relates to a narrow-particle size distribution extra-coarse cemented carbide and a preparation method thereof. The extra-coarse cemented carbide is WC-Co cemented carbide, the dispersion of the particle size distribution of WC crystal grains is less than or equal to 1.5, specifically, the dispersion is equal to (D90-D10) / D50, wherein D90, D50 and D10 are particle sizes when the number cumulative distribution respectively reaches 90%, 50% and 10%; the average particle size D50 of WC crystal grains is 6 mu m-10 mu m; and the weight content of cobalt is 3%-16%. The hardness HV10 of the cemented carbide is 700-1100, and the bending strength of the cemented carbide is larger than 2000 MPa. The preparation method of the narrow-particle size distribution extra-coarse cemented carbide comprises fragmentation of extra-coarse tungsten carbide powder hard aggregate, particle size grading of tungsten carbide powder, magnetron sputtering cobalt coating of tungsten carbide powder, wet mixing, drying, compacting and sintering. The prepared extra-coarse WC-Co cemented carbide is uniform in texture structure, the average crystal grain size of WC hard phase is coarse, the crystal grain distribution is narrow, and the comprehensive performances of the cemented carbide is good.

Description

technical field [0001] The invention relates to an ultra-coarse cemented carbide with narrow particle size distribution and a preparation method thereof. Ultra-coarse cemented carbide with narrow particle size distribution is mainly used in 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] According to the international standard, the grain size greater than 6.0μm is ultra-coarse grained cemented carbide. The WC particles of ultra-coarse WC-Co cemented carbide have a series of advantages such as complete crystal structure, less structural defects, high strength and hardness, and small microscopic strain. Ultra-coarse WC-Co cemented carbide has good toughness, impact resistance, high temperature hardness, high thermal conductivity, and small creep deformation. It is widely used in mining tools, oil drilling tools, coal mining tools, and shields fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 曹瑞军林晨光郭华彬郭名亮朱启伟刘小平肖声浪林中坤
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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