Method for preparing high-coercive force neodymium-iron-boron magnet through macroscopic non-uniform diffusion

A uniform diffusion and high coercive force technology, applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of excessive magnet strengthening, waste, and heavy rare earth elements cannot be fully utilized, and achieve magnet performance improvement , save usage, and improve overall performance

Active Publication Date: 2021-12-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, simply coating a layer of uniform heavy rare earth diffusion source will cause excessive strengthening of some parts of the magnet, so that the heavy rare earth elements cannot be fully utilized and there is unnecessary waste

Method used

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  • Method for preparing high-coercive force neodymium-iron-boron magnet through macroscopic non-uniform diffusion
  • Method for preparing high-coercive force neodymium-iron-boron magnet through macroscopic non-uniform diffusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, high coercive force NdFeB magnets are prepared by macroscopic inhomogeneous diffusion of Tb-Al-Cu and Pr-Al-Cu:

[0041] (1) Preparation of heavy rare earth-containing Tb by arc melting 90.45 al 4.39 Cu 5.16 Alloy ingot and Pr without heavy rare earth 89.35 al 4.89 Cu 5.76 (wt%) alloy ingot with low melting point.

[0042] (2) Remelting and spray-casting the two alloy ingots obtained in step (1) respectively to obtain strips corresponding to the two alloys.

[0043] (3) Coarsely crushing the two alloy strips obtained in step (2) respectively to obtain two alloy powders passing through a 60-mesh sieve.

[0044](4) Mix the two alloy powders obtained in step (3) with an organic binder (PVA glue) respectively to obtain a heavy rare earth diffusing agent and a non-heavy rare earth diffusing agent.

[0045] (5) Use 52M sintered NdFeB magnets as the diffusion substrate, cut into cuboid samples by wire cutting, the size is 7×7×4mm, and the 4mm thickness ...

Embodiment 2

[0050] In this example, high coercive force NdFeB magnets are prepared by macro-inhomogeneous diffusion of Tb-Al-Cu and Al-Cu:

[0051] (1) Preparation of heavy rare earth-containing Tb by arc melting 90.45 al 4.39 Cu 5.16 Alloy ingot and Al without heavy rare earth 70.63 Cu 29.37 (wt%) alloy ingot with low melting point.

[0052] (2) Remelting and spray-casting the two alloy ingots obtained in step (1) respectively to obtain strips corresponding to the two alloys.

[0053] (3) Coarsely crushing the two alloy strips obtained in step (2) respectively to obtain two alloy powders passing through a 60-mesh sieve.

[0054] (4) Mix the two alloy powders obtained in step (3) with an organic binder (PVA glue) respectively to obtain a heavy rare earth diffusing agent and a non-heavy rare earth diffusing agent.

[0055] (5) Use N50 sintered NdFeB magnets as the diffusion substrate, cut into cuboid samples by wire cutting, the size is 7×7×3mm, and the direction of 3mm thickness is ...

Embodiment 3

[0060] In this example, high coercive force NdFeB magnets are prepared by macroscopic inhomogeneous diffusion of Tb-Al-Cu and Pr-Al-Cu:

[0061] (1) Preparation of heavy rare earth-containing Tb by arc melting 90.45 al 4.39 Cu 5.16 Alloy ingot and Pr without heavy rare earth 89.35 al 4.89 Cu 5.76 (wt%) alloy ingot with low melting point.

[0062] (2) Remelting and spray-casting the two alloy ingots obtained in step (1) respectively to obtain strips corresponding to the two alloys.

[0063] (3) Coarsely crushing the two kinds of alloy strips obtained in step (2) respectively to obtain two kinds of powders passing through a 60-mesh sieve.

[0064] (4) Mix the two alloy powders obtained in step (3) with an organic binder (PVA glue) respectively to obtain a heavy rare earth diffusing agent and a non-heavy rare earth diffusing agent.

[0065] (5) Use N50 sintered NdFeB magnets as the diffusion substrate, cut into cylindrical samples by wire cutting, the size is φ10×3mm, and ...

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Abstract

The invention belongs to the technical field of neodymium-iron-boron rare earth permanent magnet preparation, and particularly relates to a method for preparing a high-coercive force neodymium-iron-boron magnet through macroscopic non-uniform diffusion. According to the invention, two different grain boundary diffusants are used for conducting grain boundary diffusion treatment on a neodymium-iron-boron magnet at the same time, a non-heavy rare earth diffusant is coated on the surface center portion of the easy surface of the neodymium-iron-boron magnet, the residual portion of the easy surface of the neodymium-iron-boron magnet is coated with a heavy rare earth diffusant, then diffusion heat treatment is conducted, and the coercivity of the magnet is improved; compared with a magnet treated by using a single heavy rare earth diffusant or non-heavy rare earth diffusant, the coercive force of the magnet can be greatly improved by adopting macroscopic non-uniform diffusion while heavy rare earth elements can be saved and fully utilized; and by adjusting the coating area proportion of the two diffusants, the performance of magnets with different components can be improved to the maximum extent, the performance of the magnets can be effectively regulated and controlled, and the diffusion method is more flexible than single uniform diffusion.

Description

technical field [0001] The invention belongs to the technical field of NdFeB rare earth permanent magnet preparation, and in particular relates to a method for preparing high coercive force NdFeB magnets by using macroscopic inhomogeneous diffusion. Background technique [0002] NdFeB rare earth permanent magnet materials are widely used in 5G communication technology, new energy vehicles, wind power generation and other industries because of their excellent magnetic properties. With the continuous development of technology, some application scenarios put forward higher requirements for the performance of NdFeB. For example, in the service process of NdFeB permanent magnet motors, NdFeB magnets need to work stably at high temperatures (200 ° C), and the main phase Nd 2 Fe 14 The Curie temperature of B is low (312°C), and it is extremely easy to demagnetize under high temperature conditions. In order to solve this problem, it is necessary to add a large amount of heavy rar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0293H01F1/057
Inventor 刘仲武宋文玥何家毅余红雅钟喜春邱万奇
Owner SOUTH CHINA UNIV OF TECH
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