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Preparation method of superfine grain cemented carbide

A technology of cemented carbide and ultra-fine grains, which is applied in the field of preparation of ultra-fine grained cemented carbides, can solve the problems of insufficient grain growth inhibition, failure to achieve ideal results, unfavorable ball milling and uniform mixing, etc., to achieve Realize the effects of refinement and hardness, increase hardness, and reduce the amount of addition

Inactive Publication Date: 2011-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the powder particle size of the grain growth inhibitor is very fine (less than 1 μm), the addition amount is less than 1 wt%, and the powder is easy to agglomerate naturally, which is not conducive to the uniform mixing of the ball milling process, so it will cause insufficient and abnormal grain growth inhibition. The problem of growing up, so far the relevant research work has not achieved ideal results

Method used

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  • Preparation method of superfine grain cemented carbide
  • Preparation method of superfine grain cemented carbide
  • Preparation method of superfine grain cemented carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: V 2o 5 Coated WO 3 Preparation of Structured Nanopowders

[0032] Take 100 grams of H 2 WO 4 Adding it into 2L of ammonia water with a concentration of 0.2mol / L to obtain a concentration of 0.2mol / L (NH 4 ) 2 WO 4 ; Take 1L of (NH 4 ) 2 WO 4 With 0.1L of NH at a concentration of 0.04mol / L 4 VO 3 Mix to obtain a concentration of 0.2mol / L (NH 4 ) 2 WO 4 , NH 4 VO 3 The mixed solution; the same volume, the same temperature, the concentration of 0.4mol / L HCl solution was added to the obtained (NH 4 ) 2 WO 4 , NH 4 VO 3 The mixed solution was stirred to produce precipitation; after 6 hours of aging, the solid and liquid were separated, and the solid precipitate was taken and calcined at 500°C for 3 hours to obtain a particle size of 40-60nmV 2 o 5 Coated WO 3 structured nanopowder;

[0033] The second step: preparation of WC-Co micro-nano alloy powder with VC-coated WC structure

[0034] According to the mass ratio: V 2 o 5 Coated WO 3 Str...

Embodiment 2

[0038] Step 1: V 2 o 5 Coated WO 3 Preparation of Structured Nanopowders

[0039] Take 200 grams of H 2 WO 4 Added to 2L of ammonia water with a concentration of 0.4mol / L to obtain a concentration of 0.4mol / L (NH 4 ) 2 WO 4 ; Take 1L of (NH 4 ) 2 WO 4 With 0.1L of NH at a concentration of 0.06mol / L 4 VO 3 Mix to obtain a concentration of 0.4mol / L (NH 4 ) 2 WO 4 , NH 4 VO 3 The mixed solution; the same volume, the same temperature, the concentration of 0.8mol / L HCl solution was added to the obtained (NH 4 ) 2 WO 4 , NH 4 VO 3 The mixed solution was stirred to produce precipitation; after 6 hours of aging, the solid and liquid were separated, and the solid precipitate was taken, heated to 450°C and calcined for 4 hours to obtain a particle size of 50-80nmV 2 o 5 Coated WO 3 structured nanopowder;

[0040] The second step: preparation of WC-Co micro-nano alloy powder with VC-coated WC structure

[0041] According to the mass ratio: V 2 o 5 Coated WO 3 ...

Embodiment 3

[0045] Step 1: V 2 o 5 Coated WO 3 Preparation of Structured Nanopowders

[0046] Take 300 grams of H 2 WO 4 Adding it to 2L of ammonia water with a concentration of 0.6mol / L to obtain a concentration of 0.6mol / L (NH 4 ) 2 WO 4 ; Take 1L of (NH 4 ) 2 WO 4 With 0.1L of NH at a concentration of 0.08mol / L 4 VO 3 mixed to obtain a concentration of 0.6mol / L (NH 4 ) 2 WO 4 , NH 4 VO 3 The mixed solution; the same volume, the same temperature, the concentration of 1.2mol / L HCl solution was added to the obtained (NH 4 ) 2 WO 4 , NH 4 VO 3 The mixed solution was stirred to produce precipitation; after 6 hours of aging, the solid and liquid were separated, and the solid precipitate was taken and calcined at 400°C for 3 hours to obtain a particle size of 40-90nmV 2 o 5 Coated WO 3 structured nanopowder;

[0047] The second step: preparation of WC-Co micro-nano alloy powder with VC-coated WC structure

[0048] According to the mass ratio: V 2 o 5 Coated WO 3 St...

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Abstract

The invention relates to a preparation method of superfine grain cemented carbide. Nano-powder with a V2O5-coated WO3 structure is prepared by a chemical precipitation-subsequent carbonation method and micro-nano-composite powder which has a structure genetic property and a VC-coated WC structure is generated by virtue of in-situ carbonation reaction; and VC is evenly coated on the outer layers of WC grains, the particle size is uniform and the powder has good dispersion property. During a sintering process, the VC coated on the outer layers of WC is uniformly dissolved in liquid-phase Co, thereby hindering the diffusion of W and C atoms, reducing the solubility of WC in a bonding phase, effectively inhibiting the dissolution and precipitation of W and C atoms and reducing the re-growing rate and probability of WC by dissolution and precipitation, so that WC grains are refined. The preparation method provided by the invention has the advantages of simple process, easiness in operation and uniform VC distribution in a cemented carbide matrix, and can be used for effectively inhibiting the abnormal growth of WC grains during the sintering processing; the prepared ultra-fine cemented carbide has better hardness, flexural strength and other properties than those of the cemented carbide to which an inhibitor (such as VC) is added by a mixing method, can be used for reducing the addition amount of VC, and effectively inhibiting the abnormal growth of WC grains; and industrial scale production can be realized.

Description

technical field [0001] The invention relates to a preparation method of ultrafine grain hard alloy; in particular to a preparation method of ultrafine grain hard alloy which uses VC to coat WC to suppress the grain growth of ultrafine hard alloy. Alloy material preparation technology field. Background technique [0002] Cemented carbide is composed of one or more interstitial compounds with high hardness and high elastic modulus (usually refractory metal hard compound WC as the main phase) and transition metal Fe, Co, Ni or their alloys as the bond Composite materials composed of phases. The main phase provides high strength, high hardness and high wear resistance, and the plastic binder phase provides the necessary toughness for material deformation. It is a composite material with high hardness, high strength and good toughness, usually prepared by powder metallurgy technology. WC-Co cemented carbide is widely used in the fields of mechanical processing, petroleum, minin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/08
Inventor 吝楠贺跃辉江垚张乾坤汤娅
Owner CENT SOUTH UNIV