Method for improving magnetic performance of sintered neodymium-iron-boron magnet

A magnetic performance, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of heavy rare earth element concentration reduction, limited performance improvement, shallow diffusion depth, etc. Reduce, achieve coercive force, reduce the effect of dosage

Inactive Publication Date: 2019-06-18
JIANGXI UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heavy rare earth elements Dy and Tb, as important elements for improving the coercive force, can effectively increase the anisotropy constant of the 2:14:1 phase magnetocrystal, but their price is high
Therefore, the coercive force is generally increased by depositing and diffusing

Method used

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  • Method for improving magnetic performance of sintered neodymium-iron-boron magnet
  • Method for improving magnetic performance of sintered neodymium-iron-boron magnet
  • Method for improving magnetic performance of sintered neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Slice the sintered NdFeB magnet into 20*30*5 mm blocks.

[0022] (2) The magnet was ultrasonically degreased in a degreasing solution at 50°C for 3 min, and then washed twice with water for 5-15 s each time.

[0023] (3) Place the magnet in a nitric acid solution with a concentration of 3% and shake it for 10-20 s. After taking it out, wash it twice with water for 5-15 s each time, and then perform ultrasonic vibration treatment until the magnet is observed. After the surface oxide skin has completely fallen off, it is taken out and dried at a temperature of 40°C for 20 minutes. Other methods can also be used to completely peel off the oxide skin on the surface of the magnet.

[0024] (4) When the vacuum degree is lower than 2×10 -3 At Pa, magnetron sputtering low melting point alloy AlZn, the thickness of the deposited layer is 10 μm. It can also be deposited by vapor deposition. By controlling the magnetron sputtering power of 60-90W and time of 30-60min, the...

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Abstract

The invention relates to a method for improving magnetic performance of a sintered neodymium-iron-boron magnet. The method is suitable for sintered neodymium-iron-boron magnets with various components. The method comprises low-melting-point metal or alloy grain boundary repairing, heavy rare earth element grain boundary diffusion and corresponding heat treatment technologies. According to the method, the character of the low melting point of an alloy is utilized, the surface-layer discontinuous grain boundary rare earth phase of the magnet is preferably diffused and repaired, a continuous low-melting-point rare earth phase is obtained and serves as a channel for rapid diffusion of heavy rare earth elements, the diffusion depth of the heavy rare earth elements in the magnet is effectively improved, the usage amount of the heavy rare earth elements is reduced, the coercivity of the magnet is improved, and wide application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a method for improving the magnetic properties of sintered NdFeB magnets. Background technique [0002] NdFeB permanent magnets are known as the "Magnetic King" due to their excellent magnetic properties, and are widely used in aerospace, wind power generation, energy-saving home appliances, electronic appliances, and new energy vehicles. And with the continuous improvement of manufacturing technology and the improvement of people's awareness of environmental protection, it has attracted the attention of the market in the three major fields of energy conservation and environmental protection, new energy, and new energy vehicles, and has become a key material for the realization of the "Made in China 2025" development plan. 10-20% rapid growth rate, showing good application prospects. [0003] For magnets, coercive force is an important i...

Claims

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Application Information

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IPC IPC(8): C23C14/35C23C14/16C23C14/24C23C14/58C25D13/02H01F1/057H01F41/02
Inventor 杨牧南卢耀军钟淑伟杨斌
Owner JIANGXI UNIV OF SCI & TECH
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