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Preparation method of high-compactness WC/Co composite material hard alloys

A composite material and cemented carbide technology, which is applied in metal processing equipment, metal material coating technology, liquid chemical plating, etc. High, low cost, high density effect

Inactive Publication Date: 2019-02-15
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the heating process, the energy transfer process is restricted by the thermal conductivity, and it is easy to cause uneven temperature distribution, which is not conducive to the improvement of the performance of cemented carbide products.

Method used

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  • Preparation method of high-compactness WC/Co composite material hard alloys
  • Preparation method of high-compactness WC/Co composite material hard alloys
  • Preparation method of high-compactness WC/Co composite material hard alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example provides a method for preparing a high-density WC / Co composite cemented carbide, and the preparation steps are as follows:

[0028] (1) Take 2g of WC powder with an average particle size of 5 μm, add the WC powder into the hydrofluoric acid-nitric acid solution of the coarsening liquid, and coarsen it under the action of ultrasonic dispersion, wherein the concentration of hydrofluoric acid is 60ml / L, and the concentration of nitric acid is 40ml / L, the ultrasonic frequency is 30kHz, and the ultrasonic power is 100W. Filter and dry the coarsened powder and put it into the activation solution cobalt sulfate-sodium hypophosphite solution. Soak in the same ultrasonic dispersion environment as the coarsening process, and activate The content of cobalt sulfate heptahydrate in the liquid is 40g / L, the content of sodium hypophosphite monohydrate is 40g / L, and the soaking time is 60min; then put the soaked powder into a crucible and use a box furnace for heat treatmen...

Embodiment 2

[0031] This example provides a method for preparing a high-density WC / Co composite cemented carbide, and the preparation steps are as follows:

[0032]1) Take 2g of WC powder with an average particle size of 3μm, add tungsten carbide powder to the roughening solution, and roughen under the action of ultrasonic dispersion. The concentration of hydrofluoric acid is 60ml / L, the concentration of nitric acid is 40ml / L, and the ultrasonic frequency is 40kHz, ultrasonic power is 120W. Filter and dry the roughened powder into the cobalt sulfate-sodium hypophosphite activation solution and soak in the same ultrasonic dispersion environment as the coarsening process. The sodium phosphate content is 40g / L, and the soaking time is 120min. Then put the soaked powder into the crucible and use a box furnace for heat treatment. The heating rate is 5°C / min, the heat treatment temperature is 160°C, and the heat preservation is 60min to obtain the activated powder; the pretreated powder Put in...

Embodiment 3

[0035] This example provides a method for preparing a high-density WC / Co composite cemented carbide, and the preparation steps are as follows:

[0036] 1) Take 2g of WC powder with an average particle size of 4μm, add tungsten carbide powder into the roughening solution, and roughen under the action of ultrasonic dispersion. The concentration of hydrofluoric acid is 60ml / L, the concentration of nitric acid is 40ml / L, and the ultrasonic frequency is 35kHz, ultrasonic power is 150W. Filter and dry the roughened powder into the cobalt sulfate-sodium hypophosphite activation solution and soak in the same ultrasonic dispersion environment as the coarsening process. The sodium phosphate content is 50g / L, and the soaking time is 30min. Then put the soaked powder into a crucible and use a box furnace for heat treatment. The heating rate is 8°C / min, the heat treatment temperature is 220°C, and the heat preservation is 100min to obtain the activated powder; after the cobalt salt activa...

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Abstract

The invention belongs to the technical field of ceramic material preparation, and in particular, relates to a preparation method of high-compactness WC / Co composite material hard alloys. Firstly, after carbide powder is activated through cobalt salt, a layer of uniform metal cobalt is coated on the surface of the carbide powder by adopting a chemical plating method; and then, the discharge plasmasintering is performed on the carbide powder, coated with the cobalt layer on the surface, to prepare the WC / Co composite material hard alloys. The preparation method is simple in operation in the preparation process, short in preparation period, low in pollution and low in cost; and prepared composite materials are high in compactness, and can serve as magnetic materials and alloy materials to beapplied to such fields as mine tools and constructions.

Description

technical field [0001] The invention relates to a method for preparing high-density WC / Co composite cemented carbide, in particular to a method for electroless plating cobalt-coated tungsten carbide based on cobalt salt activation, which belongs to the field of material preparation. Background technique [0002] As the material foundation of high-tech development and modern civilization in the new era, materials have become one of the three pillar industries in the 21st century. The advancement of science and technology promotes the transformation of materials from simplification to diversification. Composite materials composed of two or more materials have become a research hotspot. As an important development direction of composite materials, cemented carbide is widely used in various fields. Cemented carbide is a new material made by combining refractory metal compounds and binder phase metals in a form, proportion, and distribution designed according to performance requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C1/05B22F3/105B22F1/02C23C18/36C23C18/18
CPCC22C1/051C22C29/08C23C18/1893C23C18/36B22F3/105B22F2998/10B22F1/17B22F2003/1051
Inventor 张建峰王笑影张维维卜凡王越
Owner HOHAI UNIV
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