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A YCE co-doped nanocrystalline rare earth permanent magnet and preparation method thereof

A technology of rare earth permanent magnets and nanocrystals, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of Y being rarely used in rare earth permanent magnets, deterioration of temperature stability, and low melting point of tetragonal phase. Achieve the effects of increasing magnetization and comprehensive magnetic properties, improving temperature stability, and optimizing microstructure

Active Publication Date: 2022-02-11
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Ce 2 Fe 14 Curie temperature of B (424K) for all RE 2 Fe 14 The B tetragonal phase compound is the lowest, and the Curie temperature of sintered NdFeB magnets with Ce alone replacing Nd drops rapidly, and the temperature stability is seriously deteriorated, which is not conducive to the application of magnets in complex environments such as humidity and heat.
At the same time, Ce 2 Fe 14 The B tetragonal phase has a lower melting point, and it is easy to grow abnormally during high-temperature sintering, which is not conducive to maintaining high coercive force
[0003] Y 2 Fe 14 Room temperature magnetocrystalline anisotropy field H of B tetragonal phase A and Ce 2 Fe 14 B is similar, and has a larger saturation magnetic polarization J S (1.41T) and higher Curie temperature T C (565K); due to Y 2 Fe 14 B has no coupling between 3d and 4f electrons, and has been widely involved in basic research. However, Y has been rarely used in rare earth permanent magnets for a long time; Y is also a kind of high abundance rare earth element, and its price is much lower than that of Nd / Pr / Dy / Tb

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The composition obtained by rapid quenching is (Pr 0.12 Nd 0.48 (Y 0.3 Ce 0.7 ) 0.4 ) 17.8 Fe bal co 1.5 Ti 0.2 Ga 0.5 B 6 The main powder strips are crushed to prepare the main powder; the composition obtained by rapid quenching is Pr 70 Cu 25 al 5 The auxiliary powder strips are crushed to prepare the auxiliary powder. The main powder and the auxiliary powder with a mass ratio of 80:20 are mixed evenly and then hot-pressed. The hot-pressing temperature is 550 ° C, the pressure is 150 MPa, and the holding time is 10 min. After cooling, a completely dense isotropic magnet is obtained. Put the isotropic magnet in the mold, raise the temperature to 500°C in a protective atmosphere, heat it for 3 minutes, pressurize it for thermal deformation, pressurize 500MPa, pressurize for 5 minutes, and obtain a YCe co-doped nanocrystalline rare earth permanent magnet after cooling . The magnetic performance of the magnet is B r =11.5kG,H cj =17.4kOe, (BH) max =30.8MG...

Embodiment 2

[0021] The composition obtained by rapid quenching is (Pr 0.08 Nd 0.32 (Y 0.25 Ce 0.75 ) 0.6 ) 17 Fe bal co 1.5 Nb 0.4 Cu 0.6 B 6 The main powder strips are crushed to prepare the main powder; the composition obtained by rapid quenching is Pr 90 al 10 The auxiliary powder strips are crushed to prepare the auxiliary powder. The main powder and the auxiliary powder with a mass ratio of 75:25 are mixed evenly and then hot-pressed. The hot-pressing temperature is 650 ° C, the pressure is 250 MPa, and the holding time is 5 minutes. After cooling, a completely dense isotropic magnet is obtained. Put the isotropic magnet in the mold, raise the temperature to 650°C in a protective atmosphere, heat it for 5 minutes, pressurize it for thermal deformation, pressurize 400MPa, pressurize for 15 minutes, and obtain a YCe co-doped nanocrystalline rare earth permanent magnet after cooling . The magnetic performance of the magnet is B r =10.8kG,H cj =11.4kOe, (BH) max =22.7MGOe...

Embodiment 3

[0023] The composition obtained by rapid quenching is (Nd 0.5 (Y 0.15 Ce 0.85 ) 0.5 ) 15 Fe bal Zr 0.6 Cu 0.6 Ga 0.45 al 0.5 B 6.2 The main powder strips are crushed to prepare the main powder; the composition obtained by rapid quenching is Pr 50 Dy 20 Cu 30The auxiliary powder strips are crushed to prepare auxiliary powder. The main powder and the auxiliary powder with a mass ratio of 90:10 are mixed evenly and then hot-pressed. The hot-pressing temperature is 800 ° C, the pressure is 350 MPa, and the holding time is 3 minutes. After cooling, a completely dense isotropic magnet is obtained. Put the isotropic magnet in the mold, raise the temperature to 900°C in a protective atmosphere, heat it for 1min, pressurize it for thermal deformation, pressurize 500MPa, pressurize for 5min, and get YCe co-doped nanocrystalline rare earth permanent magnet after cooling . The magnetic performance of the magnet is B r =11.0kG,H cj =15.2kOe, (BH) max =26.2MGOe; the tempera...

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Abstract

The invention discloses a YCe co-doped nanocrystalline rare earth permanent magnet and a preparation method thereof, which can simultaneously obtain high magnetic performance and high temperature stability under high YCe substitution amount. The main powder strips and the auxiliary powder strips of the magnet are prepared by quick quenching, the main powder and the auxiliary powder are prepared by crushing, the main powder and the auxiliary powder are mixed uniformly in a certain mass ratio, and the nanocrystalline rare earth permanent magnet is prepared by hot pressing and thermal deformation. The nano-sized grains in the present invention effectively solve the problem of abnormal grain growth in Ce-rich sintered magnets, YCe co-doping can improve the magnetic properties and temperature stability of Ce-rich magnets, and the auxiliary powder can optimize the microstructure of the magnets. The invention greatly reduces the cost of rare earth raw materials while improving the magnetic performance, and balances the utilization of rare earth resources.

Description

technical field [0001] The invention relates to the field of permanent magnets, in particular to a YCe co-doped nanocrystalline rare earth permanent magnet and a preparation method thereof. Background technique [0002] The third-generation rare earth permanent magnet NdFeB has the characteristics of high remanence, high coercive force and high magnetic energy product, and is widely used in power electronics, communication information, transportation, medical equipment, aerospace and other fields. In recent years, the partial substitution of high-abundance rare earth Ce for Nd to prepare low-cost rare-earth permanent magnets has attracted extensive attention from researchers at home and abroad, and great progress has been made. However, Ce 2 Fe 14 Curie temperature of B (424K) for all RE 2 Fe 14 The B tetragonal phase compound is the lowest, and the Curie temperature of sintered NdFeB magnets with Ce alone replacing Nd drops rapidly, and the temperature stability deterio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02
CPCH01F41/0253H01F41/0293H01F41/0266
Inventor 金佳莹严密彭白星魏中华赵栋梁
Owner ZHEJIANG UNIV
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