Preparation method of sintered neodymium-iron-boron magnet with high magnetic energy product and high coercivity

A technology with high coercive force and high magnetic energy product, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc. It can solve the problems of poor consistency of magnetic properties of magnets, unfavorable production efficiency, and low utilization of heavy rare earth elements. , to achieve the effect of high consistency of magnetic properties of products, solution to poor product consistency, and easy commercial application
CN110534331AInactive Publication Date: 2019-12-03GUANGXI UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN Ā· China
Current Assignee / Owner
GUANGXI UNIVERSITY OF TECHNOLOGY
Publication Date
2019-12-03
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

The invention discloses a preparation method of a sintered neodymium-iron-boron magnet with high magnetic energy product and high coercivity. The method comprises the steps that firstly, a sintered neodymium-iron-boron rough magnet is prepared through the processes of batching, melting stripping, hydrogen explosion, air milling, magnetic field molding, sintering and machining; then pretreatment steps including derusting, degreasing, pickling and cleaning are carried out on the rough magnet; the rough magnet is sprayed and coated with a prepared heavy rare earth suspension; and finally spark plasma diffusion treatment (SPS) and tempering heat treatment are carried out on the magnet sprayed with the heavy rare earth adhesion layer to acquire the sintered neodymium-iron-boron magnet. Compared with the prior art, the preparation method provided by the invention has the advantages of excellent utilization of heavy rare earth, high processing efficiency, low production cost, high magneticproperty consistency and the like, is easy to realize commercial applications, can well meet customer needs, and is suitable for preparing the low-costed sintered neodymium-iron-boron magnet with highmagnetic energy product and high coercivity.
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Description

technical field

[0001] The invention relates to a preparation method of a sintered NdFeB magnet with high magnetic energy product and high coercive force, and belongs to the technical field of rare earth permanent magnet material preparation. Background technique

[0002] Since its invention in 1983, sintered NdFeB magnet has developed into an indispensable key material in high-tech fields such as information, energy, transportation and national defense because of its advantages such as high magnetic energy product, high coercive force and high cost performance. As the world vigorously advocates energy saving, emission reduction and green energy, the new energy industry represented by electric vehicles, wind power, and energy-saving home appliances has developed rapidly. These fields require sintered NdFeB magnets to have a high magnetic energy product BHmax to provide Sufficiently large magnetic energy storage and high enough intrinsic coercivity (Hcjā‰„30KOe) to ensure norma...

Claims

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