Neodymium-iron-boron magnet and preparation method for improving orientation degree of sintered neodymium-iron-boron magnet

By using an external DC magnetic field to treat the NdFeB green blank during sintering, the problem of insufficient orientation of NdFeB magnets was solved, the preparation process was simplified, and the orientation and performance of the magnets were improved.

CN121506664APending Publication Date: 2026-02-10JIANGXI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202511977793.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-25
Publication Date
2026-02-10

AI Technical Summary

Technical Problem

In the existing technology, the orientation degree of neodymium iron boron magnets is insufficient and the preparation process is complicated, making it difficult to maintain the orientation degree of the magnets during molding and sintering.

Method used

During the sintering process, an external DC magnetic field is used to treat the NdFeB green blank, including heat preservation, gradual heating, cooling and tempering, to ensure that the C-axis orientation of the magnet powder is consistent with the direction of the magnetic field and to avoid the orientation being destroyed.

Benefits of technology

This improved the orientation of NdFeB magnets, simplified the fabrication process, enhanced the microstructure and performance of the magnets, and resulted in high-performance NdFeB magnets.

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Abstract

The invention belongs to the technical field of rare earth permanent magnet material preparation, and provides a neodymium-iron-boron magnet and a preparation method for improving the orientation degree of the sintered neodymium-iron-boron magnet, and the preparation method comprises the step of sintering a neodymium-iron-boron green body in a magnetic field. Preferably, the magnetic field is a direct-current magnetic field, and the magnetic induction intensity of the direct-current magnetic field is 10-13T. The high-intensity magnetic field can magnetize magnet powder particles in the sintering process, so that a magnetic chain is formed among the powder particles, the binding force among the particles is improved, and the powder particles cannot rotate due to the generation of a liquid phase. The neodymium-iron-boron powder particles are arranged according to the magnetic field direction in the sintering process, so that the high orientation degree of the magnet is ensured, and the high-performance neodymium-iron-boron magnet is obtained.
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