Grain boundary diffusion method for improving diffusion performance of R-T-B magnet

A technology of R-T-B and grain boundary diffusion, applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve problems such as Br drop

Pending Publication Date: 2022-05-10
ZHEJIANG INNUOVO MAGNETICS
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Problems solved by technology

[0005] Diffusion technology is a technology that can rapidly increase Hcj in recent years. It has the advantages of low cost, convenient operation, and high cost performance. However, the principle of diffusion technology is that the Nd-rich phase melts and volatilizes at high temperature to form a diffusion channel, and t

Method used

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  • Grain boundary diffusion method for improving diffusion performance of R-T-B magnet
  • Grain boundary diffusion method for improving diffusion performance of R-T-B magnet
  • Grain boundary diffusion method for improving diffusion performance of R-T-B magnet

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Several magnets with brand N48M were selected from the product warehouse of our company. In order to facilitate the follow-up performance test, the magnet is wire-cut into several small magnetic steels of φ10*5mm, which are used as the experimental substrate. In actual production, the shape of the magnet base is not limited.

[0028] Cover the diffusion source Tb to the surface of the substrate, and use the physical vapor deposition method: on the φ10mm*5mm magnetic steel, perform magnetron sputtering physical vapor deposition in the plasma vacuum coating machine, and the atmosphere source is high-purity Ar. The principle is After the high-voltage glow discharge, the magnetic field is used to bind the accelerated electrons to bombard the Ar atoms and form a plasma, and then the electric field and the magnetic field are used to control the Ar+ ions to bombard the target, so that the Tb atoms are dispersed in the cavity after sputtering; finally, the gravity field is ...

Embodiment 2

[0034] Embodiment 2: The same as the preparation method of Embodiment 1, the difference is that the absolute vacuum degree is adjusted to 4.0*10 -2 Pa.

Embodiment 3

[0035] Embodiment 3: The preparation method is the same as that of Embodiment 1, except that the absolute vacuum degree is adjusted to 3.6kpa.

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Abstract

The grain boundary diffusion method comprises the steps that the surface of an R-T-B magnet base body is covered with a diffusion source, the diffusion source is heavy rare earth, and the mass of the diffusion source is 0.2%-4% of the mass of the magnet base body; the magnet covered with the diffusion source is subjected to grain boundary diffusion treatment, the diffusion temperature ranges from 800 DEG C to 1000 DEG C, the diffusion time ranges from 1 h to 48 h, and within 1 h to 3 h before diffusion, the absolute vacuum degree is adjusted to be 1.0 * 10 <-3 > Pa to 4.6 * 10 <-3 > Pa; and then the absolute vacuum degree is adjusted to be low vacuum between 3.6 kpa and 7.6 kpa, after grain boundary diffusion, cooling is conducted to the room temperature, then heating is conducted, tempering treatment is conducted, and the R-T-B magnet subjected to grain boundary diffusion is obtained. The Hcj of the magnet can be improved, and the residual magnetism reduction amount can be reduced.

Description

technical field [0001] The invention provides a grain boundary diffusion method for improving the performance of the R-T-B magnet by adjusting the vacuum degree and the diffusion temperature of the diffusion treatment. Background technique [0002] The sintered NdFeB magnet material has high magnetic properties, does not contain rare metal Co, is relatively low in price, has a wide range of applications, and has a long service life, so it has broad development prospects. [0003] However, sintered NdFeB magnets are still in the development stage. First, the magnetic energy product of sintered NdFeB magnets has not yet reached the theoretical limit after nearly 40 years of development. The current magnetic energy product of sintered NdFeB magnets can reach 93% of the theoretical value. Industrial small-batch production and The magnetic energy product obtained in mass production is lower. Secondly, Br is close to the theoretical value, but Hcj is far from the theoretical valu...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0293H01F1/0577
Inventor 朱啸航达明花章兆能陈彪马瑜琳付松
Owner ZHEJIANG INNUOVO MAGNETICS
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