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Preparation method of nano-structure WC-Co composite powder

A technology of composite powder and nanostructure, which is applied in the field of nanoscale WC-Co preparation, can solve the problems of limiting the final structure size, coarsening of reaction time particles, etc., to achieve carbide nucleation and grain growth inhibition, and the process is simple and reliable Effect

Inactive Publication Date: 2012-02-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Using CO to reduce and carbonize WO3 and Co2O3 composite powders, the longer reaction time makes the particles coarser and limits the final structure size that may be obtained

Method used

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  • Preparation method of nano-structure WC-Co composite powder
  • Preparation method of nano-structure WC-Co composite powder
  • Preparation method of nano-structure WC-Co composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to WC-10%Co, 0.15%VC, 0.15%Cr 3 C 2 The proportion of metal components (the powder contains 10% metal cobalt, 0.15% VC, 0.15% Cr 3 C 2 , the rest of WC), calculate and weigh metatungstic acid, cobalt nitrate, ammonium metavanadate, ammonium chromate, put them into the bucket, then add an appropriate amount of deionized water and stir, the amount of deionized water is based on the complete dissolution of various metal salts Maximum amount added. Add ultra-fine metallurgical carbon black according to 19% (weight ratio) of tungsten trioxide content. Metallurgical carbon black requires an average particle size of less than 0.1μm and a specific surface area greater than 1800m 2 / g, the sulfur content is less than 10ppm, continue to stir to form a paste, and dry it into a granular powder in a pressure atomization dryer. The air inlet temperature of the dryer is 320-350°C, and the outlet air temperature is 180-200°C. Put the dry composite salt and carbon black m...

Embodiment 2

[0040] According to WC-10%Co, 0.15%VC, 0.15%Cr 3 C 2 The proportion of metal components (the powder contains 10% metal cobalt, 0.15% VC, 0.15% Cr 3 C 2 , the rest of WC), calculate and weigh ammonium metatungstate, cobalt chloride, ammonium metavanadate, chromic acid, put them into a bucket, then add an appropriate amount of deionized water to stir, and the amount of deionized water is completely dissolved with various metal salts for the maximum increase. Add porous carbon, such as activated carbon powder, according to 19% (weight ratio) of the tungsten oxide content, and the activated carbon requires a specific surface area greater than 1800m 2 / g, the carbon content is greater than 99.5%wt, the sulfur content is less than 10ppm, continue to stir to form a paste, and dry it into a granular powder in a pressure atomization dryer. The air inlet temperature of the dryer is 320-350°C, and the outlet air temperature is 180-200°C. Put the dry composite salt and carbon black m...

Embodiment 3

[0043] According to WC-10%Co, 0.15%VC, 0.15%Cr 3 C 2 The proportion of metal components (the powder contains 10% metal cobalt, 0.15% VC, 0.15% Cr 3 C 2 , the rest of WC), calculate and weigh metatungstic acid, cobalt acetate, ammonium metavanadate, ammonium chromate, put them into the bucket, then add an appropriate amount of deionized water and stir, the amount of deionized water is based on the complete dissolution of various metal salts Maximum amount added. Add activated carbon according to 19% (weight ratio) of tungsten oxide content, and the specific surface area of ​​activated carbon is required to be greater than 1800m 2 / g, the carbon content is greater than 99.5%wt, the sulfur content is less than 10ppm, continue to stir to form a paste, and dry it into a granular powder in a pressure atomization dryer. The air inlet temperature of the dryer is 320-350°C, and the outlet air temperature is 180-200°C. Put the dry composite salt and carbon black mixture powder into...

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Abstract

The invention discloses a preparation method of a nano-structure WC-Co composite powder, and belongs to the field of an alloy preparation method. The method comprises the following steps in sequence: adding a carbonic powder material which is excessive to tungsten, vanadium and chromium carbides into water-soluble saturated mixed aqueous solution of tungsten-containing compound, cobalt-containing compound, chromium-containing compound and vanadium-containing compound to adsorb the saturated composite salt solution; dehydrating and drying to form a nano-scale composite salt thin layer on the surface of the carbonic powder material; removing crystal water out of the composite salt at the temperature below 500 DEG C under a condition of isolating air, and decomposing the composite salt into composite oxide of tungsten oxide, chromium hemitrioxide, vanadium oxide and cobalt oxide, further heating, and reducing and carbonizing the composite oxide on the surface of the carbonic powder material to generate the WC-Co nano-structure composite powder at the temperature below 850 DEG C. The preparation is a simpler and more reliable novel preparation method of the nano WC-Co composite powder by a direct carbonization method.

Description

technical field [0001] The invention belongs to the field of alloy preparation methods, in particular to a nanoscale WC-Co preparation method. Background technique [0002] Usually cemented carbide cutting tools are made of micron WC-Co powder. With the continuous improvement of the performance requirements of cemented carbide tools, researchers have found that: to improve the hardness, wear resistance and corrosion resistance of the product, it is necessary to increase the content of WC; to improve the strength, toughness and processing performance of the product, it is necessary to increase the Co content, which creates a contradiction between increasing hardness and strength. For this reason, people have begun to use finer powders, because studies have shown that when the WC grain size is reduced below submicrons, the hardness, toughness, strength, and wear resistance of the material are improved, and at the same time, complete densification is achieved. The lower the t...

Claims

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Application Information

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IPC IPC(8): B22F9/20
Inventor 朱泽华邓嵘
Owner SOUTHWEST PETROLEUM UNIV
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