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Production method for samarium cobalt alloy powder

A technology of alloy powder and samarium-cobalt, which is applied in the field of preparation of samarium-cobalt alloy powder, can solve the problems of high energy consumption in the preparation of alloy ingots, uneven grain size distribution, and performance degradation of samarium-cobalt alloy, and achieve high production efficiency, The effect of uniform distribution of ingredients and fine grain size

Active Publication Date: 2014-01-29
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method is involved in many patents, such as 200910080120.6, 201110457035.4. The samarium-cobalt alloy powder prepared by this method has the following disadvantages: it needs to consume a lot of electric energy, and in order to prevent the oxidation of raw materials during the smelting process, a high vacuum is required; in order to reduce the high-temperature smelting process The volatilization loss of alloy elements in the medium should be protected by argon gas, and the alloy ingot can only be taken out after cooling, resulting in high energy consumption, complicated operation, long cycle and potential safety hazards in the preparation of alloy ingot. During the condensation process, composition segregation, coarse grains, and uneven grain size distribution are likely to occur, resulting in a decrease in the performance of the samarium-cobalt alloy. The grain and composition uniformity of the alloy powder are the key to the preparation of high-performance samarium-cobalt permanent magnet materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take the alloy powder whose composition is 25.5% samarium, 52% cobalt, 10.5% iron, 8% copper and 4% zirconium as an example.

[0027] Take by weighing 57.05g of samarium nitrate Sm (NO 3 ) 3 , 256.82g cobalt nitrate Co(NO 3 ) 2 ·6H 2 O, 75.96g iron nitrate Fe (NO 3 ) 3 9H 2 O, 30.41g copper nitrate Cu(NO 3 ) 2 ·3H 2 O, 18.82g zirconium nitrate Zr (NO 3 ) 4 ·5H 2 O.

[0028] (1) add distilled water and be mixed with the metal salt solution containing metal salt 30% respectively in described each metal salt;

[0029] (2) Quickly mix and stir each metal salt solution, add a small amount of HNO 3 Stir evenly, control the pH value to 4-6, and obtain a transparent mixed solution;

[0030] (3) Add 10g of surfactant stearic acid and 5g of dispersant sodium lauryl sulfate, stir and mix well to prevent precipitation in the solution and make the powder dispersible;

[0031] (4) Then spray drying at 300°C to 350°C at a spray drying speed of 20,000 to 30,000 rpm to p...

Embodiment 2

[0037] Take the alloy powder whose composition is 24.5% samarium, 54.5% cobalt, 12% iron, 6.5% copper and 2.5% zirconium as an example.

[0038] Take by weighing 54.81g of samarium nitrate Sm (NO 3 ) 3 , 269.17g cobalt nitrate Co(NO 3 ) 2 ·6H 2 O, 86.81g iron nitrate Fe (NO 3 ) 3 9H 2 O, 24.71g copper nitrate Cu(NO 3 ) 2 ·3H 2 O, 11.76g zirconium nitrate Zr (NO 3 ) 4 ·5H 2 O.

[0039] (1) adding distilled water to each of the metal salts to prepare a metal salt solution containing 20% ​​of the metal salt;

[0040] (2) Quickly mix and stir each metal salt solution, add a small amount of HNO 3 Stir evenly, control the pH value to 4-6, and obtain a transparent mixed solution;

[0041] (3) Add 15g of surfactant stearic acid and 8g of dispersant sodium lauryl sulfate to prevent precipitation in the solution and make the powder dispersible;

[0042] (4) Then spray drying at 300°C to 350°C at a spray drying speed of 20,000 to 30,000 rpm to prepare a samarium-cobalt al...

Embodiment 3

[0048] Take the alloy powder whose composition is 25.5% samarium, 53% cobalt, 12% iron, 6.5% copper, 2.5% zirconium and 0.5% praseodymium as an example.

[0049] Take by weighing 57.05g of samarium nitrate Sm (NO 3 ) 3 , 261.76g cobalt nitrate Co(NO 3 ) 2 ·6H 2 O, 86.81g iron nitrate Fe (NO 3 ) 3 9H 2 O, 24.71g copper nitrate Cu(NO 3 ) 2 ·3H 2 O, 11.76g zirconium nitrate Zr (NO 3 ) 4 ·5H 2 O, 1.54g praseodymium nitrate Pr(NO 3 ) 3 ·6H 2 O.

[0050] (1) adding distilled water to each of the metal salts to prepare a metal salt solution containing 25% of the metal salt;

[0051] (2) Quickly mix and stir each metal salt solution, add a small amount of HNO 3 Stir evenly, control the pH value to 4-6, and obtain a transparent mixed solution;

[0052] (3) Add 15g of surfactant stearic acid and 8g of dispersant sodium lauryl sulfate to prevent precipitation in the solution and make the powder dispersible;

[0053] (4) Then spray drying at 300°C to 350°C at a spray dr...

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Abstract

The invention discloses a production method for samarium cobalt alloy powder. The production method for the samarium cobalt alloy powder comprises weighing samarium, cobalt, iron, copper, zirconium and heavy rare earth element metal salt in proportion, preparing a salt solution and a salt-mixture solution, adding a little acid or alkali to control a PH (Potential of Hydrogen) value to be between 4 and 9, simultaneously adding surface active agent and dispersing agent which account 1 to 5 % of the mass of the metal salt in the metal salt solution, performing spray drying at the temperature between 300 and 350 DEG C to produce composite powder precursor, performing low temperature calcine at the temperature between 200 and 300 DEG C, performing two-step restoring on the precursor under hydrogen atmosphere with the temperature between 400 to 800 DEG C, ball-milling the restored powder to obtain the samarium cobalt alloy powder. The samarium cobalt alloy powder produced through the production method has the advantages of being reasonable in powder size, uniform in crystal grain and component distribution, high in purity and low in oxygen content. The production method has the advantages of being simple in operation, low in energy consumption, high in production efficiency and suitable for continuous production.

Description

technical field [0001] The invention relates to a preparation method of a rare earth permanent magnet material, in particular to a preparation method of a samarium-cobalt alloy powder. Background technique [0002] Samarium-cobalt permanent magnet alloy is a kind of high-temperature permanent magnet material with excellent performance. has an irreplaceable role. The material has been widely used in the fields of microwave communication technology, audio-visual technology, electrical engineering, instrument technology, computing technology, automation technology, transportation, petrochemical industry, magnetization technology, magnetic separation technology, bioengineering, magnetic medical and fitness equipment, etc. . [0003] The traditional method of preparing samarium-cobalt alloy powder is to use pure elemental metals of samarium, cobalt, iron, copper, zirconium and rare earth to melt at high temperature in a vacuum induction melting furnace, and then quench the high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C19/07H01F1/053H01F1/06
Inventor 罗明谭春林李彬
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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