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Cladding cobalt powder and preparation method thereof

A technology of cobalt powder and coating, which is applied in the field of raw cobalt powder, coated cobalt powder and its preparation, which can solve the difficulty in quality control of cemented carbide powder, pollute the production environment of cemented carbide workshop, and endanger the health of production workers, etc. problems, to achieve the effect of improving quality, reducing dust and improving the environment

Active Publication Date: 2012-01-04
GEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these methods, the bonding metal (such as cobalt and nickel, etc.) is easily oxidized by oxygen or water vapor in the air before being mixed with paraffin, especially for fine particles and ultrafine particles, the quality control of cemented carbide powder High difficulty
In addition, a large amount of respirable dust is likely to be produced in the mixing and ball milling process before adding the molding agent, polluting the production environment of the cemented carbide workshop and seriously endangering the health of production workers

Method used

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  • Cladding cobalt powder and preparation method thereof
  • Cladding cobalt powder and preparation method thereof
  • Cladding cobalt powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A preparation method for coated cobalt powder, comprising the following steps: take 9.6g of paraffin and pour it into 20mL of ethyl acetate at 25°C to dissolve to form a paraffin-ethyl acetate mixture, add it to 480g of cobalt powder, and put it into a planetary dynamic mixer , the stirring and mixing time is 1.5h, the stirring speed is 60 rpm, and then vacuum-dried at 50°C to obtain waxed cobalt powder.

[0025] The waxed cobalt powder can be used to prepare cemented carbide. The method for preparing cemented carbide comprises the following steps: mixing tungsten carbide and waxed cobalt powder; adding a small amount of paraffin as a forming agent; stirring and mixing; pressing and forming; dewaxing at low temperature; and sintering at high temperature.

[0026] Among them, by reasonably controlling the total amount of paraffin wax added, the paraffin wax in the waxed cobalt powder and the subsequently added paraffin wax as a molding agent can be completely removed in ...

Embodiment 2

[0029] A preparation method of coated cobalt powder, comprising the following steps: respectively take 500g of cobalt powder and 10g of paraffin wax, put them into a planetary dynamic mixer, stir and mix under nitrogen protection conditions, the stirring and mixing temperature is 58 ° C, and the stirring and mixing time is 3h, the stirring speed is 60 rpm, and the waxed cobalt powder is obtained.

[0030] In this method, a stirring and mixing temperature of 58° C. is directly used to melt the paraffin, and the stirring and mixing make the paraffin evenly coated on the outer surface of the cobalt powder.

Embodiment 3

[0032] A method for preparing coated cobalt powder, comprising the following steps: respectively take 500g of cobalt powder and 10g of polyethylene glycol, put them into a planetary power mixer, stir and mix for 4 hours, and the stirring speed is 50 rpm, and then 45°C Dry under vacuum to obtain coated cobalt powder added with polyethylene glycol.

[0033] Paraffin wax, polyethylene glycol and polyethylene are well-known molding agents in the preparation of cemented carbide, so the present invention only provides representative examples of the effect of waxed cobalt powder as follows.

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Abstract

The invention provides cladding cobalt powder and a preparation method thereof. The cladding cobalt powder consists of cobalt powder, and paraffin, polyethylene glycol or polyethylene which is coated on the outer surface of the cobalt powder. When the cladding cobalt powder instead of the conventional cobalt powder is used as a raw material for preparing a hard alloy, dust generated in the production process can be reduced, and the environment of a production department can be improved; simultaneously, the paraffin, the polyethylene glycol or the polyethylene which is coated on the surface ofthe cobalt powder can effectively prevent the cobalt powder from being oxidized by oxygen or steam in the air, so that the quality of the cobalt powder is improved. In the invention, a cladding cobalt powder preparing process is pollution-free, and the cladding cobalt powder and the preparation method thereof are suitable for industrial production.

Description

technical field [0001] The invention relates to raw cobalt powder in the field of hard alloys, in particular to a coated cobalt powder and a preparation method thereof. Background technique [0002] Cemented carbide is usually composed of refractory metal carbides and bonding metals (such as cobalt and nickel, etc.), and its preparation method mainly includes: mixing metal carbides and bonding metals, ball milling (stirring and mixing), forming (adding Forming agent, granulation, compression molding, removal of forming agent) and sintering and other steps. [0003] Among them, forming is an important link in the process of preparing cemented carbide. Because cemented carbide is mainly composed of refractory metal carbides with high hardness, high elastic modulus, and high compressive strength, it is difficult for its powder to produce plastic deformation during the pressing process, and it is difficult to form. And there are microscopic defects (holes, inclusions, delamina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F1/102
CPCB22F1/0062B22F1/02B22F2301/15C22C29/08Y10T428/2998B22F1/102
Inventor 郭苗苗马哲波何显达周继峰傅月刘琮
Owner GEM CO LTD