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Method for improving strength of rare earth-iron-boron permanent magnet

A permanent magnet and rare earth technology, which is applied in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of NdFeB instability in the main phase, reduce the magnetic polarization of magnets, and reduce the magnetic properties of materials to achieve continuity Reinforcement, high qualified rate of finished products, enhanced effect of grain boundary strength

Inactive Publication Date: 2020-06-19
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the more common and effective method to improve the toughness of sintered NdFeB permanent magnet materials is to add a small amount of non-rare earth metals such as niobium Nb and Zr elements in the raw material formula of sintered NdFeB permanent magnet materials to improve the crystallinity of sintered NdFeB NdFeB materials. Boundary toughness, improve its flexural strength; however, the added non-rare earth metal elements such as niobium Nb, Zr, etc., will be partially dissolved in the main phase of sintered NdFeB at high temperature (the main phase NdFeB is a magnetic phase, niobium Nb, Zr and other elements magnetic material, which does not contribute to the magnetic properties of the material), so it will reduce the magnetic polarization Js of the magnet and reduce the magnetic properties of the material. In addition, the niobium Nb and Zr elements dissolved in the main phase may also cause the main phase NdFeB to be unstable

Method used

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  • Method for improving strength of rare earth-iron-boron permanent magnet
  • Method for improving strength of rare earth-iron-boron permanent magnet
  • Method for improving strength of rare earth-iron-boron permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Select ferroniobium alloy with niobium Nb content of 65%, and the formula composition is (PrNd) 29.5 Dy 1.5 Fe 66.32 B 0.98 W 0.15 co 1.0 Cu 0.15 al 0.4 Praseodymium neodymium iron boron, vacuum smelted at 0.05Pa and 1460°C respectively, then rapidly cooled by rolling copper rolls to prepare niobium-iron Nb-Fe alloy with an average thickness of 0.20mm (the average thickness of 100 samples) Flakes and praseodymium neodymium iron boron alloy flakes;

[0047] The praseodymium-neodymium-iron-boron alloy flakes are crushed by hydrogen crushing process: first, put the praseodymium-neodymium-iron-boron alloy flakes into the hydrogen crushing furnace, vacuumize (vacuum degree below 1 Pa), and then pass in hydrogen gas for hydrogen absorption and crushing, and crush the flakes into coarse powder; then dehydrogenation treatment at 560°C for more than 10 hours, when the vacuum degree reaches below 10Pa, the dehydrogenation is completed, and the water is cooled to below 40°C...

Embodiment 2

[0063] Select ferroniobium alloy with niobium Nb content of 65%, and the formula composition is (PrNd) 29.5 Tb 1.0 Fe 67 B 1.0 V 0.15 co 0.8 Cu 0.15 Ga 0.2 al 0.2 Praseodymium neodymium iron boron, vacuum smelted at 0.05Pa and 1440°C respectively, and then rapidly cooled by rolling copper rolls to prepare ferroniobium Nb-Fe alloy with an average thickness of 0.30mm (the average thickness of 100 samples) Flakes and praseodymium neodymium iron boron alloy flakes;

[0064] The praseodymium-neodymium-iron-boron alloy flakes are crushed by hydrogen crushing process: first, put the praseodymium-neodymium-iron-boron alloy flakes into the hydrogen crushing furnace, vacuumize (vacuum degree below 1 Pa), and then pass in hydrogen gas for hydrogen absorption and crushing, and crush the flakes into coarse powder; then dehydrogenation treatment at a high temperature of 560°C for more than 10 hours, when the vacuum degree reaches below 6Pa, the dehydrogenation is completed, and the ...

Embodiment 3

[0079] Select ferroniobium alloy with niobium Nb content of 65%, and the formula composition is (PrNd) 31 Dy 1 Fe 65.94 B 1.01 co 0.5 Cu 0.15 Al 0.4 Praseodymium neodymium iron boron, vacuum smelted at 0.05Pa and 1430°C respectively, then rapidly cooled by rolling copper rolls to prepare ferroniobium Nb-Fe alloy with an average thickness of 0.40mm (the average thickness of 100 samples) Flakes and praseodymium neodymium iron boron alloy flakes;

[0080] The praseodymium-neodymium-iron-boron alloy flakes are crushed by hydrogen crushing process: first, put the praseodymium-neodymium-iron-boron alloy flakes into the hydrogen crushing furnace, vacuumize (vacuum degree below 1 Pa), and then pass in hydrogen gas for hydrogen absorption and crushing, and crush the flakes into coarse powder; then dehydrogenation treatment at a high temperature of 560°C for more than 12 hours, when the vacuum degree reaches below 8Pa, the dehydrogenation is completed, and the water is cooled to b...

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Abstract

The invention discloses a method for improving the strength of a rare earth-iron-boron permanent magnet. The method comprises the following steps: preparing a sintered blank from a rare earth-iron-boron alloy sheet and a binary iron alloy sheet, carrying out high-temperature permeation treatment to obtain a blank magnet, and carrying out two-stage aging heat treatment to obtain the finished magnet. According to the method, the Nb element or the Zr element can enter the grain boundary phase of the surface layer of the magnet through diffusion and the mechanical strength of the magnet surface layer is improved; and niobium atoms or zirconium atoms basically do not enter the main phase of the magnet in the diffusion process, and the magnet still keeps relatively high magnetic performance so that the technical problem that the magnetic performance of the magnet is reduced in the existing method for enhancing the strength of the permanent magnet is solved.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a method for increasing the strength of a rare earth-iron-boron permanent magnet. Background technique [0002] Sintered rare earth-iron-boron permanent magnet materials (among them, NdFeB is a typical representative, and NdFeB is taken as an example below) belong to the third generation of rare earth permanent magnet materials. Compared with other types of permanent magnet materials, they have high magnetic performance and low price. The advantages have made its development and application have achieved extraordinary development. The application has involved in various fields of the national economy, especially in computer, information, automobile, nuclear magnetic resonance imaging, CD-ROM, DVF and other industries. [0003] However, this functional material with excellent magnetic properties and wide application has the disadvantages of poor strength and toughness...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0576H01F1/0577H01F41/0266H01F41/0293
Inventor 周志国曹玉杰陈静武黄秀莲衣晓飞熊永飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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