Anisotropic nanocrystal complex-phase compact block neodymium-iron-boron permanent-magnet material and preparation method thereof

An anisotropic, permanent magnet material technology, applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve problems such as gaps, save rare earth resources, improve magnet coercivity, and reduce the amount of rare earths Effect
CN102496437AActive Publication Date: 2012-06-13NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Publication Date
2012-06-13

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Abstract

The invention relates to an anisotropic nanocrystal complex-phase compact block neodymium-iron-boron permanent-magnet material which is characterized by comprising a nanocrystal-structure hard magnetic phase and a soft magnetic phase, wherein the hard magnetic phase is a (Nd,R)2Fe17B phase, and R is selected from at least one of La, Ce, Pr, Gd, Tb and Dy; and the soft magnetic phase is at least one of alpha-Fe alpha-FeCo or Fe3B. The invention also discloses a preparation method of the permanent-magnet material. Compared with the prior art, the permanent-magnet material has the following advantages: due to the introduction of the soft magnetic phase, the coercive force of the nano complex-phase magnet is far lower than that of the single hard magnetic phase magnet, and the liquid phase is diffused into the nano complex-phase magnet and positioned at the grain boundary, thereby obviously enhancing the coercive force of the magnet.
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Description

technical field

[0001] The invention relates to a permanent magnet material, and also relates to a preparation method of the permanent magnet material. Background technique

[0002] Since the 1980s, the third generation of rare earth permanent magnet materials-Nd 2 Fe 14 Since the discovery of B, researchers from all over the world have continued to carry out in-depth exploration, expecting to discover new rare earth permanent magnet materials with excellent permanent magnetic properties. The discovery of nano-composite permanent magnet materials has opened up new ideas for the development of new high-performance permanent magnet materials, which has important scientific significance and huge economic value. At present, the isotropic nanocrystalline composite phase permanent magnet materials are represented by the high magnetic energy quick-quenching magnetic powder developed by Magnequench, which is widely used in the form of bonded magnets. Because this magnetic powder e...

Claims

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