Preparation method of high-stability high-purity extra-coarse tungsten carbide powder

A technology of tungsten carbide powder and high stability is applied in the field of preparation of high-stability and high-purity ultra-coarse tungsten carbide powder, which can solve the problems of poor uniformity of particle size distribution, poor resistance to crushing of powder particles, and refinement of alloy grain size. Effects of low adjacency, good crush resistance, narrow particle size distribution

Inactive Publication Date: 2012-07-11
江西耀升钨业股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of high-temperature carbonization of doped or normal-purity coarse tungsten powder is that the high-temperature and long-time carbonization process is not only energy-consuming and time-consuming, but also the composition, grain structure and microscopic defects in the formed ultra-coarse polycrystalline tungsten carbide powder are difficult to obtain. Control, poor crushing resistance of powder particles, resulting in significantly finer alloy grain size and poor particle size distribution uniformity after powder ball milling and sintering, it is difficult for the alloy to obtain high performance, and the use effect and service life are not good

Method used

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  • Preparation method of high-stability high-purity extra-coarse tungsten carbide powder
  • Preparation method of high-stability high-purity extra-coarse tungsten carbide powder
  • Preparation method of high-stability high-purity extra-coarse tungsten carbide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 100kg 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, ball mill for 2 hours, decompose and break the "hard aggregates" in the powder, and then sieve it through a 200-270 mesh sieve Coarse tungsten powder with Fibonacci average particle size of 38μm can be obtained between the meshes. The obtained coarse-grained tungsten powder is mixed with carbon black according to the known ball mill mixing method, and the carbon content is 6.18%, and then loaded into a graphite boat, and carbonized in a vacuum intermediate frequency induction carbonization furnace. Keep warm at 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 agglomerates are ball milled for 3 hours at a ball-to-material ratio of 1:1, and the fine particles can be removed by cyclone air classification to ...

Embodiment 2

[0027]Put 100kg of high-purity coarse tungsten powder reduced by high temperature into the stainless steel stirring ball mill cylinder, the ratio of ball to material is 2:1, ball mill for 2 hours, decompose and crush the "hard agglomerates" in the powder, and then sieve it through a 325 mesh to 500 mesh sieve Coarse tungsten powder with Fischer's average particle size of 19 μm can be obtained between the screens. The obtained coarse-grained tungsten powder is mixed with carbon black according to a known ball mill mixing method, and the carbon content is 6.10%, and then packed into a graphite boat, and each graphite boat is loaded with 8kg of material, and pushed into a direct-heating carbon tube carbonization furnace, and the Carbonization in a protective atmosphere takes 30 minutes and the carbonization temperature is 1900°C. After the furnace is cooled, the primary carbonized material released from the furnace is ball milled at a ball-to-material ratio of 2:1 for 1 hour, and...

Embodiment 3

[0030] Put 100kg of high-purity coarse tungsten powder reduced by high temperature into the stainless steel ball mill cylinder, the ball-to-material ratio is 2:1, ball mill for 2 hours, decompose and break the "hard agglomerates" in the powder, and then sieve it through a 170-325 mesh screen Coarse tungsten powder with an average Fischer particle size of 23 μm can be obtained. The obtained coarse-grain tungsten powder is mixed with carbon black according to the known ball mill mixing method, and the carbon content is 6.10%. Then, it is packed into a graphite boat, and each graphite boat is loaded with 13kg of material, and pushed into an internal heating type continuous automatic high-temperature carbonization furnace. Carbonization in hydrogen protective atmosphere, push a boat in 45 minutes, the highest carbonization temperature is 2300 ℃. The continuous carbonized material released from the furnace after the furnace is cooled is crushed by ball milling for 3 hours at a ball...

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Abstract

A preparation method of a high-stability high-purity extra-coarse tungsten carbide powder contains the following steps of: (1) grinding a high-purity extra-coarse tungsten carbide powdered raw material with its chemical purity being greater than or equal to 99.98 wt%, and carrying out size grading to obtain the required average granularity and a high-purity extra-coarse tungsten powder according to the particle size distribution; (2) carrying out carbon addition by the use of carbon black according to the total carbon content of the obtained tungsten carbide powder being 6.13+/-0.05%, followed by ball milling and mixing to obtain a ball-milling mixture; (3) filling the obtained ball-milling mixture into a graphite boat and a carbide furnace, and carrying out high-temperature carbonization at 1600-2500 DEGC for the carbonization time of 1-10 hours; and (4) carrying out coarse crushing on the obtained carbonized material, followed by grinding and crushing, and carrying out size grading to obtain the high-purity extra-coarse tungsten carbide powder. The method provided by the invention can be adopted to produce the high-purity extra-coarse tungsten carbide powder with good crush resistance, morphology and structure and excellent thermal stability. The high-purity extra-coarse tungsten carbide powder is used to prepare an extra-coarse crystal cemented carbide product with high performance.

Description

technical field [0001] The invention relates to the synthesis technology of refractory metal compound powder, in particular to a preparation method of high-stability and high-purity ultra-coarse tungsten carbide powder. Background technique [0002] Cemented carbide composed of tungsten carbide (WC) and metal cobalt (Co) has a wide range of industrial applications due to its high hardness and high strength. According to the international standard, WC grain size of 2.5 ~ 6.0 μm is coarse-grained cemented carbide, and grain size greater than 6.0 μm is ultra-coarse-grained cemented carbide. The ultra-coarse WC powder raw material has a series of advantages such as complete crystal structure, less structural defects, high microhardness, small microscopic strain, and certain plasticity. The ultra-coarse WC-Co cemented carbide manufactured with it has good toughness, impact resistance, High-temperature hardness, high thermal conductivity, and small creep deformation are widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/34C01B32/949
Inventor 郭成珉林晨光郭华彬郭名亮曹瑞军刘小平林中坤朱启伟郭家亮
Owner 江西耀升钨业股份有限公司
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