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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

Inactive Publication Date: 2016-09-07
WUXI NEW GREAT POWER ELECTRICAL MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogen absorption and crushing capacity of 2:17 series samarium-cobalt alloys has a great relationship with the composition of the alloy. Most of the 2:17 series samarium-cobalt alloys often need to be broken under a hydrogen pressure of one MPa or even dozens of MPa due to their 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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preparation example Construction

[0028] The invention provides a method for preparing a samarium cobalt permanent magnet material, which comprises the following steps:

[0029] S1, prepare the first alloy ingot and the second alloy ingot according to the ratio of each element, wherein the chemical atomic measurement formula of the first alloy ingot is Sm 1-x R x (Co 1-a-b-c Fe a Ni b Y 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 Ni e Y f ) n , where, 0≤m≤0.3, 0≤d≤0.1, 0≤e≤0.15, 0≤f≤0.04, 5≤n≤6.5;

[0030] S2, absorbing hydrogen in 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 ...

Embodiment 1

[0055] Raw materials are weighed according to the ratio of each element, wherein the first alloy ingot: Sm23.63wt%, Co46.34wt%, Fe21.59wt%, Ni4.91wt%, Y3.53wt%, its chemical atomic weight formula is Sm (Co 0.61 Fe 0.3 Ni 0.06 Y 0.03 ) 8.2 ; The second alloy ingot: Sm29.04wt%, Co61.26wt% Fe0.68wt%, Ni 5.79wt%, Y3.23wt%, its chemical atomic formula is Sm (Co 0.882 Fe 0.011 Ni 0.077 Y 0.03 ) 6.1 .

[0056] 1) Alloy smelting: put the raw material in a high-frequency induction melting furnace, evacuate it to below 2×10-2Pa, then fill it with 0.06MPa high-purity argon gas, heat it with electricity, and pour it into a water-cooled furnace after the raw material is completely melted into a liquid. In the splint copper mold, the first alloy ingot and the second alloy ingot are respectively obtained.

[0057] 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 ob...

Embodiment 2

[0065] Raw materials are weighed according to the ratio of each element, wherein the first alloy ingot: Sm23.63wt%, Co46.33wt%, Fe21.59wt%, Ni4.92wt%, Y3.53wt%, its chemical atomic weight formula is Sm (Co0 .61Fe0.3Ni0.06Y0.03) 8.2; the second alloy ingot: Sm28.71wt%, Co62.36wt%, Fe0.34wt%, Ni5.35wt%, Y3.24wt%, its chemical atomic weight formula is Sm ( co 0.894 Fe 0.005 Ni 0.071 Y 0.03 ) 6.2 .

[0066]1) Alloy smelting: put the raw material in a high-frequency induction melting furnace, evacuate it to below 2×10-2Pa, then fill it with 0.06MPa high-purity argon gas, heat it with electricity, and pour it into a water-cooled furnace after the raw material is completely melted into a liquid. In the splint copper mold, the first alloy ingot and the second alloy ingot are respectively obtained.

[0067] 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...

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Abstract

The invention relates to a preparation method of a samarium-cobalt permanent magnet material. A traditional 2:17 samarium-cobalt sintered magnet which cannot easily absorb hydrogen to break is prepared by combining a double-alloy technology and a hydrogen breaking technology. The method specifically comprises the following steps: (1) preparing a first alloy ingot with high iron content and low rare earth content and a second alloy ingot with high rare earth content and low iron content according to the ratio of various elements respectively; (2) carrying out hydrogen absorption and dehydrogenation on the first alloy ingot under 0.3-0.45MPa first hydrogen pressure to obtain first hydrogen broken powder, and carrying out hydrogen absorption and dehydrogenation on the second alloy ingot under 0.2-0.35MPa second hydrogen pressure to obtain second hydrogen broken powder; (3) carrying out airflow milling on the first hydrogen broken powder and the second hydrogen broken powder respectively to obtain first alloy powder and second alloy powder; and (4) mixing the first alloy powder and the second alloy powder evenly, and sequentially carrying out orienting compression, sintering solid solution and aging treatment to obtain the samarium-cobalt permanent magnet 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 application field 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 mill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F1/08B22F9/02
CPCH01F1/0551B22F9/023H01F1/0555
Inventor 徐明
Owner WUXI NEW GREAT POWER ELECTRICAL MACHINE
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