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Nanocrystalline thermal deformation rare-earth permanent magnet material with high coercivity and preparation method of nanocrystalline thermal deformation rare-earth permanent magnet material

A high coercive force, rare earth permanent magnet technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of poor comprehensive magnetic properties of magnets, reduction of residual magnetism, etc., to improve coercive force and coercive force Improvement, easy operation and industrialization effect

Active Publication Date: 2016-02-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the increase of Nd-rich phase added by grain boundary diffusion, the Nd of the magnet 2 Fe 14 The B main phase is reduced. Although the magnet obtained by the thermal deformation process has a high coercive force, the remanence is significantly reduced, resulting in poor comprehensive magnetic properties of the magnet.

Method used

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  • Nanocrystalline thermal deformation rare-earth permanent magnet material with high coercivity and preparation method of nanocrystalline thermal deformation rare-earth permanent magnet material
  • Nanocrystalline thermal deformation rare-earth permanent magnet material with high coercivity and preparation method of nanocrystalline thermal deformation rare-earth permanent magnet material
  • Nanocrystalline thermal deformation rare-earth permanent magnet material with high coercivity and preparation method of nanocrystalline thermal deformation rare-earth permanent magnet material

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preparation example Construction

[0025] The invention provides a method for preparing a high-coercivity nanocrystalline heat-deformed rare earth permanent magnet material, which comprises the following steps:

[0026] S1, providing alloy powder and high melting point additives respectively, wherein the high melting point additives are at least one of refractory carbides, nitrides, and oxides;

[0027] S2, uniformly mixing the alloy powder and the high melting point additive to obtain a mixed magnetic powder, wherein the mass ratio of the high melting point additive in the mixed magnetic powder is greater than or equal to 0.01 and less than or equal to 10%; and

[0028] S3, performing hot-press forming and heat-deformation forming on the mixed magnetic powder in sequence to obtain a high-coercivity nanocrystalline heat-deformable rare earth permanent magnet material.

[0029] In step S1, the chemical formula of the alloy powder is Re by mass percentage x Fe 100-x-y-z m y B z , where Re is one or more of Nd...

Embodiment 1 to 9

[0044] In composition Nd 30 Ga 0.5 Fe bal. co 4 B 1 Add high melting point additives with a particle size of 10 nanometers to 50 nanometers to the alloy powder and mix them uniformly. Please refer to Table 1 for the amount and type of high melting point additives.

[0045] Inductively heat the mixed powder in a vacuum environment. When the temperature rises to 200°C, the first pressure is applied to the first mold, and the maximum temperature is controlled to 670°C to obtain a hot-pressed magnet, in which the temperature rises from room temperature to the maximum temperature The time is 5 minutes to 6 minutes, the first pressure is 150MPa, and the vacuum degree during the hot pressing process is not lower than 5×10 -2 Pa.

[0046] Put the hot-pressed blank into a second mold with a larger diameter, and inductively heat the hot-pressed magnet in an argon atmosphere, so that the hot-pressed magnet is deformed with a deformation degree of 70%. When the temperature reaches ...

Embodiment 10 to 14

[0049] The thermally deformable magnets of Example 1, Example 2, Example 3, Example 5, and Example 6 were respectively placed in a vacuum environment, and tempered at 700° C. for 2 hours. After cooling, the magnetic properties of the magnet were measured according to the method of Example 1, and the results are shown in Table 2.

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Abstract

The invention relates to a preparation method of a nanocrystalline thermal deformation rare-earth permanent magnet material with high coercivity. The method comprises the steps as follows: (1) alloy powder and a high melting point additive are respectively provided, wherein the high melting point additive is at least one of refractory carbide, nitride and oxide; (2) the alloy powder and the high melting point additive are mixed evenly to obtain mixed magnetic powder, wherein the mass ratio of the high melting point additive in the mixed magnetic powder is greater than or equal to 0.01% and is smaller than or equal to 10%; and (3) hot press molding and thermal deformation molding are sequentially carried out on the mixed magnetic powder, so as to obtain the nanocrystalline thermal deformation rare-earth permanent magnet material with high coercivity. The invention further provides the nanocrystalline thermal deformation rare-earth permanent magnet material with high coercivity.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnets, in particular to a rare earth permanent magnet material with excellent magnetic properties and a preparation method thereof. Background technique [0002] Rare earth permanent magnet materials are permanent magnet materials based on intermetallic compounds formed by rare earth metal elements and transition metals. NdFeB permanent magnets (also known as NdFeB permanent magnets) are currently the permanent magnet materials with the highest magnetic properties. NdFeB permanent magnets are widely used in social production, life, national defense and aerospace and other fields, and have become important functional materials supporting social progress. [0003] The preparation methods of NdFeB permanent magnet materials mainly include thermal deformation method and sintering method. Compared with the sintering method, the thermal deformation method has the advantages of low rare ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/08B22F3/02B22F1/00
Inventor 郑晓芬尹文宗靳朝相剧锦云陈仁杰李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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