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A preparation method of cemented carbide nano-particle size powder and high-performance sintered bulk material

A cemented carbide block and bulk material technology, applied in the field of new materials and new powder metallurgy, can solve the problems of uneven particle size distribution, many powder crystal defects, difficult to obtain nanocrystals, etc., to improve the densification rate and reduce the grain boundary. Distortion energy, the effect of improving mechanical properties

Active Publication Date: 2016-04-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the powder preparation methods widely used at home and abroad include high-energy ball milling, mechanochemical synthesis, spray conversion, chemical synthesis, sol-gel method, etc. Although nanoscale powders can be prepared, there are complex process routes and uneven particle size distribution. , There are many crystal defects in the powder, especially the prepared powder is prone to rapid grain growth in the subsequent sintering and densification process, and it is difficult to finally obtain a cemented carbide bulk material with nanocrystalline structure
Although many researchers have tried to control the growth of grains during the densification process by using new sintering technologies such as high-frequency induction heating sintering, ultra-high pressure rapid sintering, pulse plasma sintering, and spark plasma sintering, they have successfully prepared nanocrystals with high performance. Carbide reports are still extremely rare

Method used

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  • A preparation method of cemented carbide nano-particle size powder and high-performance sintered bulk material
  • A preparation method of cemented carbide nano-particle size powder and high-performance sintered bulk material
  • A preparation method of cemented carbide nano-particle size powder and high-performance sintered bulk material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Violet tungsten (WO 2.72 ), micron-scale cobalt oxide (Co 3 o 4 ) and vanadium oxide (V 2 o 5 ) and graphene mixture as raw material, according to the requirements of Co content (Co content 10wt%) in the final prepared cemented carbide bulk material, the above raw materials are mixed in proportion and ball milled, the ball milling medium is deionized water, the ball milling speed 400r / min, the ball milling time is 150h, the ball-to-material ratio is 15:1, and the mixed powder after ball milling is dried in a vacuum drying oven.

[0023] The mixed powder after ball mill drying was cold-pressed into a billet, and placed in a furnace with flowing argon for reduction and carbonization reactions. The reaction temperature was 850°C, the heating rate was 10°C / min, and the holding time was 3h. The particle size of WC-Co-VC powder particles, its morphology see figure 1 .

[0024] The WC-Co-VC (above V 2 o 5 The added amount of VC is all converted into VC, and the mass pe...

Embodiment 2

[0026] Violet tungsten (WO 2.72 ), micron-scale cobalt oxide (Co 3 o 4 ) and vanadium oxide (V 2 o 5 ) and carbon nanotubes as raw materials, according to the requirements of the Co content in the final prepared cemented carbide bulk material (Co content 12wt%), the above raw materials are mixed in proportion and ball milled, the ball milling medium is deionized water, ball milling The rotation speed is 500r / min, the ball milling time is 100h, the ball-to-material ratio is 10:1, and the mixed powder after ball milling is put into a vacuum drying oven for drying.

[0027] The mixed powder after ball mill drying was cold-pressed into a billet, and placed in a furnace with flowing argon for reduction and carbonization reactions. The reaction temperature was 900°C, the heating rate was 15°C / min, and the holding time was 2h. Particle size of WC-Co-VC powder particles.

[0028] The WC-Co-VC powder (above-mentioned V 2 o 5 The added amount of VC is all converted into VC, and t...

Embodiment 3

[0030] Violet tungsten (WO 2.72 ), micron-scale cobalt oxide (Co 3 o 4 ) and vanadium oxide (V 2 o 5 ) with graphene and carbon nanotubes as raw materials, according to the requirements of Co content in the final prepared cemented carbide bulk material (Co content 8wt%), the above raw materials are mixed in proportion and ball milled, and the ball milling medium is deionized water, the ball milling speed is 600r / min, the ball milling time is 50h, the ball-to-material ratio is 5:1, and the mixed powder after ball milling is put into a vacuum drying oven for drying.

[0031] The mixed powder after ball mill drying was cold-pressed into a billet, and placed in a furnace fed with flowing argon for reduction and carbonization reactions. The reaction temperature was 1000°C, the heating rate was 20°C / min, and the holding time was 1h. Particle size of WC-Co-VC powder particles.

[0032] The WC-Co-VC powder (above-mentioned V 2 o 5 The added amount of VC is all converted into VC...

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Abstract

The invention discloses a preparation method of hard alloy nanoparticle powder and a high-performance sintered block material, and belongs to the technical field of novel materials and novel powder metallurgy. The method comprises the following steps: performing mixing and ball-milling on nano-scale purple tungsten oxide, micrometer-scale cobaltous oxide and vanadium oxide and graphene or a carbon nanotube or a mixture of graphene and the carbon nanotube serving as raw materials; performing cold-pressing on the ball-milled mixed powder to obtain a blank, performing reduction and carbonization reactions in the atmosphere of flowing argon gas to prepare WC-Co-VC powder; and sintering and densifying the WC-Co-VC powder of nano-scale particle diameter by using an ultrahigh solid phase sintering technology to obtain a nano-crystal hard alloy block material with high density and high performance. The hard alloy block material has the advantages of pure material phase, high density, uniform size distribution of nano-crystals, superior mechanical performance, and the like.

Description

technical field [0001] The invention belongs to the technical field of new materials and novel powder metallurgy, and in particular relates to a preparation method of cemented carbide nano-particle size powder and high-performance sintered bulk material. Background technique [0002] In the cemented carbide material system, WC-Co-based cemented carbide has become an indispensable processing tool material in machinery manufacturing, aerospace, petrochemical and other fields due to its high hardness, wear resistance and bending strength. In the 1990s, it was predicted that, compared with traditional coarse-grained cemented carbide, nanocrystalline cemented carbide could have an excellent combination of hardness and toughness, and thus become a more advanced tool material required in high-end technology fields. However, the preparation of WC-Co nanocrystalline cemented carbide materials is still in the stage of laboratory development, and the properties reported at home and abr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05
Inventor 宋晓艳王西龙刘雪梅王海滨
Owner BEIJING UNIV OF TECH
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