Superfine cobalt powder preparation method

A technology of ultra-fine cobalt powder and cobalt powder, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of complicated process and equipment, increase production cost, etc., and achieve the effects of stable product quality, improved production efficiency and simple operation.

Pending Publication Date: 2018-02-02
YUCHEN ADVANCED ENERGY MATERIALS & TECH WUXI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ultrafine cobalt powder with an average particle size of less than 1 μm can be prepared by these methods, the process and equipment for producing ultrafine cobalt powder by these methods are relatively complicated. In addition to the preparation of cobalt compound precursors, raw materials such as reducing agents are also required. increased production costs

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  • Superfine cobalt powder preparation method
  • Superfine cobalt powder preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) 3.0 kg of spherical cobalt carbonate of 0.7 μm is loaded into each boat and placed in a tube furnace, and the N 2 The flow rate is 4.0m 3 / h, the thermal decomposition temperature is 400°C, the time is 6 hours, and the cobaltous oxide powder is produced;

[0021] (2) The cobaltous oxide powder obtained in step (1) is placed in a hydrogen reduction furnace, and H in the reducing gas 2 :N 2 :H 2 The volume ratio of O is 3:1:0.01, and the control gas flow rate is 6.0m 3 / h, the reduction temperature is 450°C, and the reduction time is 8 hours, and finally a spherical ultrafine cobalt powder is obtained, with an average particle size of 0.6 μm.

[0022] Figure 1 ~ Figure 3 The photos of the superfine cobalt powder produced in this embodiment under the s4800 type field emission scanning electron microscope are 1000 times, 2000 times and 5000 times respectively, and we can see that its crystal form is a spherical shape.

Embodiment 2

[0024] (1) 2.0 kg of 0.5 μm spherical cobalt carbonate is loaded into each boat and placed in a tube furnace to control CO 2 The flow rate is 6.0m 3 / h, the thermal decomposition temperature is 300°C, the time is 8 hours, and the cobaltous oxide powder is produced;

[0025] (2) The cobaltous oxide powder obtained in step (1) is placed in a hydrogen reduction furnace, and H in the reducing gas 2 :N 2 :H 2 The volume ratio of O is 3:1:0.02, and the control gas flow rate is 4.0m 3 / h, the reduction temperature is 350°C, and the reduction time is 10 hours, and finally a spherical ultrafine cobalt powder is obtained, with an average particle size of 0.4 μm.

Embodiment 3

[0027] (1) 4.0kg of 1.0μm spherical cobalt carbonate is loaded into each boat and placed in a tube furnace, and the Ar flow rate is controlled to be 2.0m 3 / h, the thermal decomposition temperature is 600°C, the time is 4 hours, and the cobaltous oxide powder is produced;

[0028] (2) The cobaltous oxide powder obtained in step (1) is placed in a hydrogen reduction furnace, and H in the reducing gas 2 :N 2 :H 2 The volume ratio of O is 3:1:0.01, and the control gas flow rate is 8.0m 3 / h, the reduction temperature is 500°C, and the reduction time is 6 hours, and finally a spherical ultrafine cobalt powder is obtained, with an average particle size of 1.0 μm.

[0029] In summary, the present invention adopts the two-step method of decomposition and reduction to control the particle size and morphology of cobalt powder, and decomposes ultrafine cobalt carbonate in an inert gas atmosphere to obtain a single cobaltous oxide powder. It can be quickly reduced to cobalt powder. T...

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Abstract

The invention relates to a metal powder preparation method, in particular to a superfine cobalt powder preparation method. The superfine cobalt powder preparation method comprises the steps of S1, taking dried and crushed spherical cobalt carbonate powder with the particle size less than or equal to 1 micron and conducting thermal decomposition on the spherical cobalt carbonate powder in an inertgas atmosphere at 300-600 DEG C for 4-8 h to obtain cobalt oxide powder; S2, conducting reduction on the cobalt oxide powder obtained in the step S1 at 350-500 DEG C in a reducing gas atmosphere for 6-10 h to obtain cobalt powder, wherein reducing gas comprises components including H2, N2 and H2O at the volume ratio 3:1:(0.01-0.02); and S3, conducting 200-mesh screening on the cobalt powder obtained in the step S2 to obtain superfine cobalt powder. By means of the method, the raw materials have a variety of sources, the production cost is low, operation is easy, and the superfine cobalt powderwith the average particle size less than or equal to 1.0 micron can be obtained.

Description

technical field [0001] The invention relates to a method for preparing metal powder, in particular to a method for preparing ultrafine cobalt powder. Background technique [0002] Cobalt has excellent physical, chemical and mechanical properties, and is an important material for the manufacture of high-strength alloys, high-temperature resistant alloys, hard alloys, magnetic materials and catalysts. With the reduction of cobalt powder particle size, the ball milling time and sintering temperature of cemented carbide powder mixture can be significantly reduced, the bending strength, wear resistance and fracture resistance of cemented carbide can be enhanced, and cobalt pools and pores can be reduced appear. [0003] At present, cobalt powder is generally produced by hydrogen reduction method in China, mainly producing fine cobalt powder with an average particle size between 1 and 2 μm, and less ultrafine cobalt powder with a particle size below 1.0 μm. In order to produce c...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00
CPCB22F9/22B22F1/065
Inventor 何爱山
Owner YUCHEN ADVANCED ENERGY MATERIALS & TECH WUXI
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