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Method for preparing nanocrystalline WC-Co hard alloy through amorphous crystallization

A cemented carbide and nanocrystalline technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of difficult preparation of ceramic-based amorphous precursor materials and preparation of nanocrystalline cemented carbide.

Active Publication Date: 2019-01-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has never been applied in the field of ceramic materials or ceramic matrix composites, the fundamental reason is that the preparation of ceramic matrix amorphous precursor materials is extremely difficult
Therefore, there is no report on the preparation of nanocrystalline cemented carbide by amorphous crystallization at home and abroad.

Method used

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  • Method for preparing nanocrystalline WC-Co hard alloy through amorphous crystallization
  • Method for preparing nanocrystalline WC-Co hard alloy through amorphous crystallization
  • Method for preparing nanocrystalline WC-Co hard alloy through amorphous crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The ternary compound Co with an average particle size of about 300nm was prepared in batches with the applicant's existing authorized patent technology (authorized patent number: CN201510491451.4) 6 W 6 C powder is used as a raw material, and is added into a cemented carbide ball milling tank together with cemented carbide balls, and four kinds of cemented carbide grinding balls with diameters of 4mm, 5mm, 8mm and 10mm are loaded into each tank, and the mass ratio is 2:2:4:2, using argon as a protective atmosphere, cemented carbide grinding balls and ternary compound Co 6 W 6 The weight ratio of C is 18:1, the ball milling time is 70 hours, the ball milling speed is 600r / min, and amorphous Co is obtained after ball milling. 6 W 6 C powder; for the prepared amorphous Co 6 W 6 C powder is tested for carbon content, and the measured carbon content is 1.10wt.%, according to the reaction formula Co 6 W 6C+5C=6WC+6Co add corresponding carbon black 4.90wt.%, so that the...

Embodiment 2

[0024] The ternary compound Co with an average particle size of about 500nm was prepared in batches with the applicant's existing authorized patent technology (authorized patent number: CN201510491451.4) 6 W 6 C powder is used as a raw material, and is added into a cemented carbide ball milling tank together with cemented carbide balls, and four kinds of cemented carbide grinding balls with diameters of 4mm, 5mm, 8mm and 10mm are loaded into each tank, and the mass ratio is 2:2:4:2, using argon as a protective atmosphere, cemented carbide grinding balls and ternary compound Co 6 W 6 The weight ratio of C is 22:1, the ball milling time is 65 hours, the ball milling speed is 550r / min, and amorphous Co is obtained after ball milling. 6 W 6 C powder; for the prepared amorphous Co 6 W 6 C powder is tested for carbon content, and the measured carbon content is 1.20wt.%, according to the reaction formula Co 6 W 6 C+5C=6WC+6Co add corresponding carbon black 5.30wt.%, so that th...

Embodiment 3

[0027] The ternary compound Co with an average particle size of about 400nm was prepared in batches with the applicant's existing authorized patent technology (authorized patent number: CN201510491451.4) 6 W 6 C powder, using it as raw material, is added to the cemented carbide ball milling tank together with cemented carbide balls, and four kinds of cemented carbide grinding balls with diameters of 4mm, 5mm, 8mm and 10mm are loaded into each tank, and the mass ratio is 2:2:4:2, using argon as a protective atmosphere, cemented carbide grinding balls and ternary compound Co 6 W 6 The weight ratio of C is 25:1, the ball milling time is 55 hours, the ball milling speed is 500r / min, and amorphous Co is obtained after ball milling. 6 W 6 C powder; for the prepared amorphous Co 6 W 6 C powder is tested for carbon content, and the measured carbon content is 1.50wt.%, according to the reaction formula Co 6 W 6 C+5C=6WC+6Co add corresponding carbon black 5.40wt.%, so that the ca...

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Abstract

The invention discloses a method for preparing nanocrystalline WC-Co hard alloy through amorphous crystallization and belongs to the field of hard alloy material preparation. Firstly, ternary compoundCo6W6C powder is prepared, amorphous Co6W6C powder is obtained through high energy ball milling, then under the condition of spark plasma sintering, crystallization reaction occurs to the amorphous Co6W6C powder, nano-polycrystalline structure WC-Co two-phase composite powder is generated in one step, then sintering densification is conducted, and finally compact nanocrystalline-structure WC-Co hard alloy bulk material is obtained. Through the method, the effect that the amorphous Co6W6C powder is fully crystallized, and pure WC and Co are obtained through sufficient reaction can be ensured,meanwhile no obvious grain growth occurs, and thus the average grain size of WC in the bulk is maintained to the nanoscale.

Description

technical field [0001] The invention belongs to the field of hard alloy material preparation, and in particular relates to a method for preparing nanocrystalline WC-Co hard alloy bulk material by using a ternary compound as a precursor. Background technique [0002] Due to its unique properties such as high hardness and wear resistance, high bending strength and good fracture toughness, WC-Co cemented carbide is widely used in industrial fields such as cutting tools, molds, mining tools and wear-resistant parts. When the grain size of WC is refined to ultra-fine or even nanoscale, cemented carbide can have higher hardness and strength. The traditional method is to add refractory metal carbides (VC, Cr 3 C 2 , NbC, etc.) as a grain growth inhibitor to control grain coarsening during sintering, in order to obtain a cemented carbide bulk material with nano-grain structure. However, because it is difficult to solve the contradiction between controlling the grain growth and ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F3/105B22F1/00C22C29/08C22C1/05C22C1/10
CPCC22C1/058C22C29/08B22F3/105B22F9/04B22F2999/00B22F2009/043B22F1/054B22F2201/11
Inventor 宋晓艳彭勇王海滨刘雪梅
Owner BEIJING UNIV OF TECH
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