Interface control method of grain boundary diffusion neodymium-iron-boron magnet

A technology of grain boundary diffusion and interface regulation, which is applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of magnet grade reduction, achieve the effect of eliminating the reduction of residual magnetism and inhibiting diffusion

Active Publication Date: 2017-10-20
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, this reduction in remanence often leads to a reduction in the grade of the magnet after diffusion

Method used

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  • Interface control method of grain boundary diffusion neodymium-iron-boron magnet
  • Interface control method of grain boundary diffusion neodymium-iron-boron magnet
  • Interface control method of grain boundary diffusion neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Grain boundary diffusion of a commercial N50 magnet with magnetic properties Br 14.24kGs, (BH) m 49.10MGOe, H cj The main component of 10.44kOe is Nd 26.6 Fe Bal B 1.01 Dy 0.03 Pr 4.7 Co 0.92 Cu 0.09 Al 0.27 .

[0020] (1) The block N50 magnets were cut into cylindrical samples of Φ10×10 by wire cutting.

[0021] (2) DyF 3 The powder (particle size is less than 10μm) is mixed with high-purity alcohol according to the mass ratio of 1:1, and then the mixed solution is ball-milled and stirred by a ball mill to obtain DyF 3 Mixed slurry with alcohol.

[0022] (3) DyF 3 The slurry mixed with alcohol is coated on the surface of the sample and thoroughly dried, and a layer of DyF is obtained on the surface of the sample. 3 coating.

[0023] (4) The sample was subjected to grain boundary diffusion treatment for 10 h under an argon atmosphere at 900 °C. After the diffusion is completed, the sample is subjected to secondary tempering treatment for 4 hours in an ar...

Embodiment 2

[0026] Grain boundary diffusion of commercial 38AH magnet, its magnetic properties Br 12.48kGs, (BH) m 38.35MGOe, H cj The main component of 34.03kOe is Nd 25.6 Fe Bal B 1.01 Dy 4.3 Tb 0.7 Pr 4.6 Co 0.92 Cu 0.09 .

[0027] (1) The block 38AH magnet was cut into cylindrical samples of Φ10×10 by wire cutting.

[0028] (2) Electroplating a layer of Tb on the surface of the sample by electrophoresis. The specific operation method is to clean and activate the surface of the sample, 2 (OH) 3 NO 3 ·H 2 Electroplating in O electrolyte for 4 min, so that the Tb electrophoresis layer is evenly coated on the surface of the sample, and the sample is thoroughly dried.

[0029] (3) The sample was subjected to grain boundary diffusion treatment at 900 °C in an argon atmosphere for 14 h. After the diffusion is completed, the sample is subjected to secondary tempering treatment for 4 hours in an argon atmosphere at 520 ° C. The magnetic properties of the sample are measured as B...

Embodiment 3

[0032] Grain boundary diffusion of a commercial N50 magnet with magnetic properties Br 14.24kGs, (BH) m 49.10MGOe, H cj The main component of 10.44kOe is Nd 26.6 FeBal B 1.01 Dy 0.03 Pr 4.7 Co 0.92 Cu 0.09 Al 0.27 .

[0033] (1) The block N50 magnets were cut into cylindrical samples of Φ10×10 by wire cutting.

[0034] (2) TbH 2 The powder (particle size is less than 10μm) is mixed with high-purity alcohol according to the mass ratio of 1:1, and then the mixed solution is ball-milled and stirred by a ball mill to obtain TbF 2 Mixed slurry with alcohol.

[0035] (3) TbH 2 The slurry mixed with alcohol is coated on the surface of the sample and dried thoroughly, and a layer of TbH is obtained on the surface of the sample. 2 coating.

[0036] (4) The sample was subjected to rare earth diffusion treatment for 10h under argon atmosphere at 875°C. After the diffusion is completed, the sample is subjected to secondary tempering treatment for 4 hours in an argon atmosph...

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Abstract

The invention discloses an interface control method of a grain boundary diffusion neodymium-iron-boron magnet, and belongs to the technical field of rare earth permanent magnetic materials. By interface control treatment, the grain boundary structure of the neodymium-iron-boron magnet is improved, distribution of rare earth at a grain boundary and diffusing into grains is optimized, and high residual magnetism is obtained in the diffused magnet. By interface control treatment, distribution of heavy rare earth Dy and Tb inside the magnet can be controlled, the heavy rare earth Dy and Tb is only distributed on surface layers of main phase NdFeB grains, and finally, residual magnetism of the magnet reduced by rare earth diffusion treatment is restored to be approximate to level before diffusion. The method has the advantages that the problem of residual magnetism reduction caused by coercive force increased by grain boundary diffusion is solved, the magnet with high residual magnetism and super-high coercivity can be prepared and produced, and the method has a wide market prospect and remarkable economic benefits.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to an interface regulation method of a grain boundary diffused NdFeB magnet, which adjusts and improves the magnetic properties of the NdFeB magnet after grain boundary diffusion through the interface regulation. Background technique [0002] The theoretical maximum magnetic energy product of NdFeB permanent magnets can reach 512kJ m (64MGOe), because its excellent magnetic properties have been widely used in energy, transportation, machinery, medical, IT, home appliances and other industries, and the market prospect is broad. However, the Curie temperature of NdFeB permanent magnets is usually only 310℃-350℃, and the thermal stability is poor at high temperature, and the remanence loss is large. However, the service temperature of electric vehicle motors, manufacturing robot power units, and some high-precision instruments and meters is rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0575H01F41/0253H01F41/0293
Inventor 冯海波赵扬李安华谭敏李卫
Owner CENT IRON & STEEL RES INST
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