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A kind of preparation method of samarium cobalt permanent magnet material

A permanent magnet material, samarium cobalt technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of hidden safety hazards, difficulty in realizing industrial production, and high requirements for equipment and equipment, and achieve improved powder making efficiency and good magnetic properties. The effect of improving the mechanical performance, reducing energy consumption and equipment loss

Active Publication Date: 2019-02-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2:17 series samarium cobalt alloy hydrogen absorption crushing ability has a great relationship with the alloy composition, most of the 2:17 series samarium cobalt alloy often needs to be broken under a hydrogen pressure of one MPa or even dozens of MPa due to the composition. Hydrogen absorption pulverization is produced, such a high hydrogen pressure requires high requirements on equipment, and there are great safety hazards, making it difficult to realize industrial production

Method used

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Examples

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Effect test

preparation example Construction

[0029] The invention provides a method for preparing a samarium cobalt permanent magnet material, which comprises the following steps:

[0030] S1, prepare the first alloy ingot and the second alloy ingot according to the ratio of each element, wherein the chemical atomic formula of the first alloy ingot is Sm 1-x R x (Co 1-a-b-c Fe a Cu b Zr c ) z , R is one or more of Ce, Pr, Nd, Gd, Tb, Dy, Ho and Er, 0≤x≤0.3, 0.26≤a≤0.5, 0≤b≤0.15, 0≤c≤0.04, 7.5≤z≤8.5, the chemical atomic formula of the second alloy ingot is Sm 1-m R m (Co 1-d-e-f Fe d Cu e Zr f ) n , where, 0≤m≤0.3, 0≤d≤0.1, 0≤e≤0.15, 0≤f≤0.04, 5≤n≤6.5;

[0031] S2, absorbing hydrogen from the first alloy ingot at the first hydrogen pressure and the first hydrogen absorption temperature for 1 hour to 5 hours, and then dehydrogenating at 290° C. for 1 hour to 2 hours to obtain the first hydrogen powder, The second alloy ingot is absorbed hydrogen at the second hydrogen pressure and the second hydrogen absorpti...

Embodiment 1

[0056] Raw materials are weighed according to the ratio of each element, wherein the first alloy ingot: Sm 23.63wt%, Co 46.34wt%, Fe21.59wt%, Cu 4.91wt%, Zr 3.53wt%, its chemical atomic formula is Sm(Co 0.61 Fe 0.3 Cu 0.06 Zr 0.03 ) 8.2 ; The second alloy ingot: Sm 29.04wt%, Co 61.26wt% Fe 0.68wt%, Cu 5.79wt%, Zr3.23wt%, its chemical atomic weight formula is Sm (Co 0.882 Fe 0.011 Cu 0.077 Zr 0.03 ) 6.1 .

[0057] 1) Alloy smelting: Put the raw materials in a high-frequency induction melting furnace and vacuumize to 2×10 -2 Below Pa, then fill it with 0.06MPa high-purity argon gas, heat it with electricity, pour it into a water-cooled splint copper mold after the raw material is completely melted into liquid, and obtain the first alloy ingot and the second alloy ingot respectively.

[0058] 2) Hydrogen crushing powder: the first alloy ingot was absorbed hydrogen at 0.43MPa hydrogen pressure and 60°C for 2 hours, and then dehydrogenated at 290°C for 1.5h to obtain the ...

Embodiment 2

[0066] Raw materials are weighed according to the ratio of each element, wherein the first alloy ingot: Sm 23.63wt%, Co 46.33wt%, Fe21.59wt%, Cu 4.92wt%, Zr 3.53wt%, and its chemical atomic weight formula is Sm(Co 0.61 Fe 0.3 Cu 0.06 Zr 0.03 ) 8.2; The second alloy ingot: Sm 28.71wt%, Co 62.36wt%, Fe 0.34wt%, Cu 5.35wt%, Zr3.24wt%, its chemical atomic weight formula is Sm (Co 0.894 Fe 0.005 Cu 0.071 Zr 0.03 ) 6.2 .

[0067] 1) Alloy smelting: Put the raw materials in a high-frequency induction melting furnace and vacuumize to 2×10 -2 Below Pa, then fill it with 0.06MPa high-purity argon gas, heat it with electricity, pour it into a water-cooled splint copper mold after the raw material is completely melted into liquid, and obtain the first alloy ingot and the second alloy ingot respectively.

[0068] 2) Hydrogen crushing powder: the first alloy ingot was absorbed hydrogen at 0.43MPa hydrogen pressure and 60°C for 2 hours, and then dehydrogenated at 290°C for 1.5h to ...

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Abstract

The invention relates to a preparation method of a samarium cobalt permanent magnetic material. A traditional 2:17 series samarium cobalt sintered magnet which is difficult to break by virtue of hydrogen absorption is prepared by combining a dual-alloy process and a hydrogen breaking process. The preparation method specifically comprises the following steps; (1) respectively preparing a fist alloy ingot with high iron content and low rare earth content as well as a second alloy ingot with high rare earth content and low iron content; (2) hydrogenating and de-hydrogenating the first alloy ingot under a first hydrogen pressure to obtain first hydrogen breaking powder, hydrogenating and de-hydrogenating the second alloy ingot to obtain second hydrogen breaking powder under a second hydrogen pressure, wherein the first hydrogen pressure is 0.3MPa to 0.45MPa, and the second hydrogen pressure is 0.2MPa to 0.35MPa; (3) respectively grinding the first hydrogen breaking powder and the second hydrogen breaking powder by virtue of an air flow to obtain first alloy powder and second alloy powder; (4) uniformly mixing the first alloy powder and the second alloy powder, and sequentially carrying out the orientation forming, sintering solid solution and aging treatment to obtain the samarium cobalt permanent magnetic material.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a method for preparing high-efficiency and energy-saving samarium-cobalt permanent magnet materials. Background technique [0002] 2:17 series samarium cobalt rare earth permanent magnet is an excellent high temperature permanent magnet material. Due to its high Curie temperature (above 700°C), high coercive force (above 18kOe), good temperature stability, good corrosion resistance and oxidation resistance, the 2:17 series samarium cobalt rare earth permanent magnets can be used at high temperature and high stability The field of application plays an irreplaceable role. 2:17 series samarium cobalt rare earth permanent magnets have been widely used in military and aerospace fields. [0003] The traditional preparation method of 2:17 series samarium cobalt rare earth permanent magnets is: batching→smelting ingot casting→mechanical crushing→ball milling or jet m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053H01F1/08B22F9/04
Inventor 李明刘壮刘雷薛智琴陈仁杰李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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