Preparation method of diffusion samarium-iron-nitrogen magnet with high coercivity and high magnetic energy product

A technology with high coercivity and high magnetic energy product, which can be used in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., and can solve the problems of the main phase damage of samarium iron nitrogen in the oxide layer.

Active Publication Date: 2021-02-19
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many methods for adding elements, such as high-energy ball milling, CVD, sonochemical method, electrochemical coating, etc., to a certain extent, these methods will introduce oxide layer, impurities and cause damage to the main phase of SmFeN

Method used

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  • Preparation method of diffusion samarium-iron-nitrogen magnet with high coercivity and high magnetic energy product

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Embodiment 1

[0019] Embodiment 1: A method for preparing a diffused samarium-iron-nitride magnet with high coercive force and high energy product, comprising the following steps:

[0020] Step (1) Preparation of diffusion source:

[0021] Mix a certain amount of heavy rare earth metal element Dy and transition element metal Cr particles, and use high-energy ball milling under the protection of argon to form a nanoscale particle mixture after ball milling the mixed particles, and mix the mixture with acetone to form a diffusion source mixed solution;

[0022] Step (2) Laser perforation of SmFeN magnet:

[0023] Using femtosecond to nanometer laser pulses, the laser wavelength is 810nm, the pulse duration is 300fs, the pulse intensity is 250uJ, the spot size is 5μm, and the surface of the SmFeN magnet with the size of 10mm×10mm×10mm is perforated. The distance between the holes 10μm, and form a briquette magnet;

[0024] Step (3) SmFeN surface and interior coating:

[0025] Immerse the br...

Embodiment 2

[0031] Mix a certain amount of heavy rare earth metal element Gd and transition element metal V particles, and use high-energy ball milling under the protection of argon to form a nanoscale particle mixture after ball milling the mixed particles, and mix the mixture with acetone to form a diffusion source mixed solution;

[0032] Step (2) Laser perforation of SmFeN magnet:

[0033] Using femtosecond to nanometer laser pulses, the laser wavelength is 1560nm, the pulse duration is 300fs, the pulse intensity is 350 uJ, the spot size is 7μm, and the surface of the SmFeN magnet with the size of 20mm×20mm×20mm is perforated. The distance between the holes 50μm, and form a briquette magnet;

[0034] Step (3) SmFeN surface and interior coating:

[0035] Immerse the briquette-shaped magnet in the mixed solution of the diffusion source, take it out, and pre-fire it at 120°C for 2 hours under the protection of nitrogen to obtain a magnet with a diffusion source coating inside and on the...

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Abstract

The invention discloses a preparation method of a diffusion samarium-iron-nitrogen magnet with high coercivity and high magnetic energy product, which comprises the following steps: mixing heavy rareearth metal and transition element metal particles, carrying out high-energy ball milling on the mixed particles to form a nanoscale particle mixture, and mixing the mixture with an organic solvent toform a diffusion source mixed solution; perforating the surface of the samarium-iron-nitrogen magnet by using femtosecond to nano laser pulses to form a coal ball-shaped magnet; immersing the coal ball-shaped magnet into the diffusion source mixed solution, taking out the magnet, and presintering at low temperature under the protection of nitrogen to obtain a magnet with a diffusion source coating inside and on the surface of the magnet; and finally, carrying out heat treatment on the magnet under argon protection and a strong magnetic field, and obtaining the samarium-iron-nitrogen magnet with high performance. Under the condition that a main phase in the samarium-iron-nitrogen magnet is not damaged, the interior and the surface of the magnet are coated with the diffusion layers throughthe laser perforation processing technology, doping elements are introduced through three-dimensional diffusion, the anisotropy and the magnetic performance of the samarium-iron-nitrogen magnet are improved, and the process is simple, easy to operate and suitable for batch production.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing a diffused samarium-iron-nitrogen magnet with high coercive force and high magnetic energy product. Background technique [0002] In order to improve the performance of Sm-Fe-N magnetic powder, material scientists have carried out a lot of research. For example, Wendhausen et al. found that the Sm obtained by doping Co instead of Fe 2 (Fe 0.8 co 0.2 )17N x The Curie temperature reaches 845 K, which is higher than that of Sm 2 Fe 17 N 3 As high as ~100K, doping V can increase the coercive force and obviously improve the shape of the demagnetization curve. Ye et al. found that Cr doping is beneficial to improve the temperature stability and oxidation resistance of Sm-Fe-N magnets. Ping et al. prepared α-Fe / Sm-Fe-N nanocomposite permanent magnet materials, and found that the addition of Zr can effectively control the particle size. is ~0.8...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/059
CPCH01F41/0253H01F41/0293H01F1/059
Inventor 杨杭福华思昊黄霞妮吴琼余能君泮敏翔葛洪良
Owner CHINA JILIANG UNIV
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