Neodymium-iron-boron permanent magnet material prepared from Dy and preparation method of neodymium-iron-boron permanent magnet material

A permanent magnet material, neodymium iron boron technology, applied in the field of materials, can solve the problems of reducing the magnetic moment of iron atoms, complexity, and reduction of remanence, and achieve the effect of improving coercive force

Inactive Publication Date: 2020-06-02
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Heavy rare earth elements Dy and Tb have a high anisotropy field. The traditional process is mainly added in the smelting process. Dy and Tb elements are evenly distributed inside the entire grain. After replacing Nd, the coercive force of the magnet is improved. However, due to Dy, Tb Elements and iron are antiferromagnetically coupled, and the

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  • Neodymium-iron-boron permanent magnet material prepared from Dy and preparation method of neodymium-iron-boron permanent magnet material
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  • Neodymium-iron-boron permanent magnet material prepared from Dy and preparation method of neodymium-iron-boron permanent magnet material

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Embodiment 1

[0035] Preparation of Dy grain boundary diffusion in NdFeB magnets with heavy rare earth wrapped Nd 2 Fe 14 The method for the core-shell structure permanent magnet material of B phase, the process parameter of each magnetic performance optimum comprises following main steps:

[0036] (1) Take the NdFeB regenerative magnet sample. According to the mold specification of the sintering furnace: 12.5mm×12.5mm×4mm, and considering that the thickness of the sample increases by about 0.5mm after coating, the sample is processed into 12.5mm× 12.5mm×3.5mm sample, where the orientation direction is used as the diffusion direction;

[0037] (2) After the sample is surface treated (pickling, degreasing, derusting), it is dried for use;

[0038] (3) Dysprosium fluoride (DyF 3 ) as a diffusion source, after the dysprosium fluoride precipitate is dried, it is made into a suspension with anhydrous alcohol in a certain proportion, and is ready for use;

[0039] (4) Coat the suspension on t...

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Abstract

The invention provides a neodymium-iron-boron permanent magnet material prepared from Dy and a preparation method of the neodymium-iron-boron permanent magnet material. The preparation method comprises the following steps that the surface of a neodymium-iron-boron regenerated magnet sample is coated with a layer of Dy element powder, and sintering is carried out in a vacuum sintering furnace, so that the Dy element diffuses on the Nd2Fe14B phase grain boundary, and finally, the neodymium-iron-boron permanent magnet material with a shell structure is formed. The Dy is diffused in the neodymiumiron boron grain boundary to synthesize the permanent magnet material with more excellent performance. The surface of the neodymium-iron-boron regenerated magnet is coated with the layer of Dy elementpowder; and sintering is carried out in the vacuum sintering furnace, so that the Dy element is diffused on the Nd2Fe14B phase grain boundary to synthesize the permanent magnet material with the core-shell structure in which the Nd2Fe14B phase wrapped by the heavy rare earth, and the coercive force, the magnetic energy product, the Curie temperature and the like of the neodymium-iron-boron regenerated magnet can be remarkably improved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to an NdFeB permanent magnet material prepared by using Dy and a preparation method thereof. Background technique [0002] Since Park et al. discovered the excellent improvement effect of grain boundary diffusion technology on the coercive force of NdFeB, a large number of experts and scholars have been attracted to carry out research on NdFeB heavy rare earth grain boundary diffusion technology. Heavy rare earth elements Dy and Tb have a high anisotropy field. The traditional process is mainly added in the smelting process. Dy and Tb elements are evenly distributed inside the entire grain. After replacing Nd, the coercive force of the magnet is improved. However, due to Dy, Tb Elements and iron are antiferromagnetically coupled, and the partial substitution of Nd elements reduces the magnetic moment of iron atoms, resulting in a decrease in remanence. [0003] The structural com...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0293H01F41/0253
Inventor 姚青荣王江饶光辉韦奇黄伟超周怀营
Owner GUILIN UNIV OF ELECTRONIC TECH
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