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Method for preparing compact nanocrystalline WC-Co hard alloy block material with small grain size

A technology of cemented carbide block and small grain, which is applied in the field of new materials and new powder metallurgy, to achieve the effect of small WC grain size, stable thermodynamic properties, and inhibition of WC grain growth

Active Publication Date: 2012-05-30
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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This preparation method all has not seen relevant report at home and abroad at present

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  • Method for preparing compact nanocrystalline WC-Co hard alloy block material with small grain size
  • Method for preparing compact nanocrystalline WC-Co hard alloy block material with small grain size
  • Method for preparing compact nanocrystalline WC-Co hard alloy block material with small grain size

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Firstly, the grain growth inhibitor VC powder particles are refined by ball milling. The ball milling process parameters are: ball-to-material ratio 5:1, ball milling time 50h, ball milling speed 600rpm, and the statistical average particle size of VC powder particles decreases after ball milling. to below 100nm; the VC powder particles after ball milling are 0.5% and the average particle diameter is the nanometer WC-Co composite powder of 90nm according to the total mass ratio of VC powder and WC-Co composite powder (microscopic appearance such as figure 1 ) for ball milling and mixing, the process parameters are: absolute ethanol is used as the liquid ball milling medium, the ball-to-material ratio is 1:1, the ball milling time is 20 hours, the ball milling speed is 600rpm, and the WC-Co-VC mixed powder after ball milling is put into 80°C vacuum drying Drying in the oven for 24 hours, the microscopic appearance of the prepared nano-WC-Co-VC mixed powder is as follows: ...

Embodiment 2

[0023] Firstly, the grain growth inhibitor VC powder particles are refined by ball milling. The ball milling process parameters are: ball-to-material ratio 20:1, ball milling time 20h, ball milling speed 300rpm, and the statistical average particle size of VC powder particles decreases after ball milling. to below 100nm; the VC powder particles after ball milling are mixed according to the total mass ratio of VC powder and WC-Co composite powder of 1.0% and nano-WC-Co composite powder with an average particle size of 70nm. The process parameters are: Anhydrous ethanol is used as the liquid ball milling medium, the ball-to-material ratio is 10:1, the ball milling time is 5 hours, the ball milling speed is 300rpm, and the WC-Co-VC mixed powder after ball milling is dried in a vacuum oven at 80°C for 12 hours; Sintering method The WC-Co-VC mixed powder is sintered and densified. The process parameters are: heating rate 200°C / min, after holding at 700°C for 1min, pressurizing 30MPa...

Embodiment 3

[0025] Firstly, the grain growth inhibitor VC powder particles are refined by ball milling. The ball milling process parameters are: ball-to-material ratio 10:1, ball milling time 30h, ball milling speed 500rpm, and the statistical average particle size of VC powder particles decreases after ball milling. to less than 100nm; the VC powder particles after ball milling are mixed according to the total mass ratio of VC powder and WC-Co composite powder of 2.0% and nano WC-Co composite powder with an average particle size of 60nm. The process parameters are: Anhydrous ethanol is used as the liquid ball milling medium, the ball-to-material ratio is 20:1, the ball milling time is 10 hours, the ball milling speed is 500rpm, and the WC-Co-VC mixed powder after ball milling is dried in a vacuum oven at 80°C for 20 hours; Sintering method The WC-Co-VC mixed powder is sintered and densified. The process parameters are: heating rate 300°C / min, after holding at 750°C for 3 minutes, pressing...

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Abstract

The invention discloses a method for preparing a compact nanocrystalline WC-Co hard alloy block material with a small grain size, which belongs to the technical field of novel materials and novel powder metallurgy. The method comprises the steps of: performing mixed ball milling on a grain growth inhibitor, namely VC powder particles subjected to ball milling refinement treatment and nanometer WC-Co composite powder to obtain nanometer WC-Co-VC mixed powder of which the components are distributed uniformly and which has high dispersibility; and quickly sintering the nanometer WC-Co-VC mixed powder by spark plasma sintering technology for compacting, and finally obtaining the compact nanocrystalline WC-Co hard alloy block material with the small grain size by applying a novel process formed by the links such as ultra-fast heating at the initial stage, pressurization after gas discharge, sintering temperature reduction, short-time heat preservation by stages and the like. The nanocrystalline hard alloy block material prepared by the method has the advantages of pure phase, compactness, small WC grain size and the like. The method has the remarkable advantages of simple steps, short flow, energy conservation and environmental-friendliness 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 a dense, small-grain size nanocrystalline WC-Co cemented carbide bulk material. Background technique [0002] Compared with traditional coarse-grained cemented carbide, ultrafine-grained (WC average grain size 0.1-0.5μm) cemented carbide has significantly improved hardness, wear resistance, red hardness, transverse fracture strength and good fracture toughness, In recent years, it has become an irreplaceable tool and structural material in high-tech industries such as aerospace, automobile industry, mold manufacturing, and electronic information. Compared with ultrafine-grained cemented carbide, based on the unique microstructure, nanocrystalline (WC average grain size <100nm) cemented carbide can further improve performance and may undergo a sudden change in performance at a certain grain size, which can si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/04
Inventor 宋晓艳高杨刘雪梅
Owner BEIJING UNIV OF TECH
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