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A kind of preparation method of high coercive force and high magnetic energy product diffusion samarium iron nitrogen magnet

A technology with high coercive force and high magnetic energy product, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, and magnetic materials. Can effect

Active Publication Date: 2022-06-21
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

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  • A kind of preparation method of high coercive force and high magnetic energy product diffusion samarium iron nitrogen magnet

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Embodiment 1

[0019] Embodiment 1: a preparation method of a high coercivity and high magnetic energy product diffusion samarium iron nitrogen magnet, 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, under the protection of argon, use high-energy ball milling, after ball milling the mixed particles, form a nano-scale particle mixture, and mix the mixture with acetone to form a diffusion source mixed solution;

[0022] Step (2) Laser perforation of samarium iron nitrogen magnet:

[0023] Using femtosecond to nanometer laser pulses, the laser wavelength is 810nm, the pulse duration is 300fs, the pulse intensity is 250 uJ, the spot size is 5μm, and the surface of the 10mm×10mm×10mm samarium iron nitrogen magnet is perforated, and the distance between the holes is 10μm, and forms a briquettes magnet;

[0024] Step (3) Samarium Iron Nitrogen Surface an...

Embodiment 2

[0031] Mixing a certain amount of heavy rare earth metal element Gd and transition element metal V particles, under the protection of argon, using high-energy ball milling, the mixed particles are ball-milled to form a nano-scale particle mixture, and the mixture is mixed with acetone to form a diffusion source mixed solution;

[0032] Step (2) Laser perforation of samarium iron nitrogen 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 20mm×20mm×20mm samarium iron nitrogen magnet is perforated, and the distance between the holes is 50μm, and forms a briquettes magnet;

[0034] Step (3) Samarium Iron Nitrogen Surface and Internal Coating:

[0035] Immerse the briquetted magnet in the mixed solution of the diffusion source, take it out under the protection of nitrogen, and pre-sinter it at a low temperature of 120 ° C for 2 hours ...

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Abstract

The invention discloses a method for preparing a diffused samarium-iron-nitrogen magnet with high coercive force and high magnetic energy product, which comprises the following steps: mixing heavy rare earth metal element metal and transition element metal particles, using high-energy ball milling, and ball milling the mixed particles to form Nanoscale particle mixture, mix the mixture with an organic solvent to form a mixed solution of a diffusion source; use femtosecond to nanometer laser pulses to perforate the surface of a samarium-iron-nitrogen magnet to form a coal ball-shaped magnet; immerse the coal ball-shaped magnet in the diffusion source mixed solution, take out Pre-fire 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; finally, the magnet is heat-treated under the protection of argon and a strong magnetic field to obtain a high-performance samarium-iron-nitrogen magnet. In the present invention, without destroying the main phase of the SmFeN magnet, the diffusion layer is coated on the inside and surface of the magnet through laser perforation processing technology, and doping elements are introduced into the three-dimensional diffusion to improve the anisotropy and magnetic properties of the SmFeN magnet. Yes, the process is simple, easy to operate, and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of a high coercivity and high magnetic energy product diffusion samarium iron nitrogen magnet. 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 Sm obtained by doping Co instead of Fe 2 (Fe 0.8 Co 0.2 )17N x The Curie temperature of 845 K is higher than that of Sm 2 Fe 17 N 3 As high as ~100K, doping with V can increase the coercivity and significantly 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 ~0.83 T and the maximum...

Claims

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Application Information

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Patent Type & Authority Patents(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