Superfine cobalt powder and its manufacturing technology

A technology of ultra-fine cobalt powder and manufacturing process, applied in the field of cemented carbide materials, can solve the problems of low product performance, low added value, low technical content, etc., and achieves low cost, improved hardness and flexural strength, and simple preparation process. Effect

Active Publication Date: 2008-01-09
GEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, due to the backwardness of domestic production technology, compared with the level of developed countries, the quality of cemented carbide products in my country is poor, and the performance of mo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Add industrial-grade cobalt carbonate powder with an average particle size of 10μm and 1% (wt) grinding dispersant into the high-energy ball milling tank, and add YG10 cemented carbide at the ratio of (weight ratio) powder: ball = 1:10 Grinding ball, the diameter of the grinding ball is φ6~φ30mm, φ6:φ30(wt)=2:1;

[0027] 3. Vacuum the ball mill tank to 10 -3 Pa, pass argon protection, argon pressure is 10 3 Pa;

[0028] 4. After the argon-filled ball tank is tightly sealed, high-energy ball milling is started. The equipment is a planetary high-energy ball mill. The speed of the ball milling tank is controlled to 300 rpm and the ball milling time is 40 hours to obtain ultra-fine cobalt carbonate and trace amounts. Superfine mixed cobalt oxide powder such as: CoO, Co 2 O 3 , Co 3 O 4 Wait.

[0029] 5. Put superfine cobalt carbonate in H 2 In the medium reduction, the reduction temperature was controlled to 460°C, and the reduction operation was maintained for 1.4 hours to ...

Embodiment 2

[0032] 1. Add technical grade cobalt oxalate powder with an average particle size of 2μm and 1% (wt) grinding dispersant into the high-energy ball milling tank, and add YG10 cemented carbide at the ratio of (weight ratio) powder: ball = 1:15 Grinding ball, the diameter of the grinding ball is φ6~φ30mm, φ6:φ30(wt)=2:1;

[0033] 3. Vacuum the ball mill tank to 10 -3 Pa, pass argon protection, argon pressure is 10 3 Pa;

[0034] 4. After the argon-filled ball tank is tightly sealed, high-energy ball milling is started. The equipment is a planetary high-energy ball mill. The speed of the ball milling tank is controlled to 350 rpm and the ball milling time is 50 hours to obtain superfine cobalt oxalate powder, and Trace ultrafine mixed cobalt oxide powder (such as: CoO, Co 2 O 3 , Co 3 O 4 Wait).

[0035] 5. Put the superfine cobalt oxalate powder in H 2 In medium reduction, the reduction temperature is controlled to 480°C, and the reduction operation is maintained for 1.5 hours to obt...

Embodiment 3

[0038]1. Add industrial grade cobalt carbonate powder with an average particle size of 5μm and 1.5% (wt) grinding dispersant into the high-energy ball milling tank, and add YG10 cemented carbide at the ratio of (weight ratio) powder: ball = 1:15 Grinding ball, the diameter of the grinding ball is φ6~φ30mm, φ6:φ30(wt)=1.5:1;

[0039] 3. Vacuum the ball mill tank to 0.5×10 -3 Pa, argon protection, argon pressure 5×10 2 Pa;

[0040] 4. After the argon-filled ball tank is sealed tightly, high-energy ball milling is started. The equipment is a planetary high-energy ball mill. The speed of the ball milling tank is controlled to 400 rpm and the ball milling time is 45 hours to obtain superfine cobalt carbonate and trace amounts. Superfine mixed cobalt oxide powder such as: CoO, Co 2 O 3 , Co 3 O 4 Wait.

[0041] 5. Put superfine cobalt carbonate in H 2 In medium reduction, the reduction temperature is controlled to 480°C, and the reduction operation is maintained for 1.6 hours to obtain ...

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PUM

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Abstract

The present invention relates to one kind of superfine cobalt powder and its production process. The production process includes the following steps: setting cobalt carbonate or cobalt oxalate powder, grinding dispersant and hard alloy balls in certain weight proportion into high energy ball mill pot; vacuumizing the ball mill pot and introducing protective argon; sealing the ball mill pot, and ball milling at controlled rotation speed to obtain superfine cobalt carbonate or cobalt oxalate powder; and reducing the superfine cobalt carbonate or cobalt oxalate powder in hydrogen atmosphere to obtain superfine cobalt powder in oxygen content not more than 0.5 % and granularity smaller than 0.6 micron. The superfine cobalt powder is applied in producing high quality hard alloy, and has simple production process and low cost.

Description

Technical field [0001] The invention relates to a cemented carbide material, more specifically, the invention relates to an ultrafine cobalt powder and a manufacturing method thereof. Background technique [0002] Superfine cemented carbide has excellent properties and is an important direction for the development of cemented carbide. Superfine Co powder must be added to produce ultrafine cemented carbide. Therefore, high-quality ultra-fine Co powder is one of the important raw materials for the production of ultra-fine cemented carbide. The development of ultra-fine Co powder is of great significance to the preparation of high, precise and sharp cemented carbide products and to improve the level of my country's cemented carbide production industry. [0003] At present, due to the backward domestic production technology level, compared with the level of developed countries, my country's cemented carbide products are of poor quality, and most of the products are still low in perfo...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F9/04
Inventor 刘沙许开华
Owner GEM CO LTD
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