Preparation method of sintered neodymium-iron-boron magnet

A neodymium iron boron and magnet technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of easy agglomeration of magnetic powder, limited diffusion depth, uneven distribution of heavy rare earth elements, etc., to reduce magnetization coupling The effect of suppressing uneven distribution of heavy rare earths

Inactive Publication Date: 2019-07-16
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, these grain boundary diffusion methods are only carried out on the surface of the magnet, and the diffusion depth is limited. Generally, the thickness of the diffusion magnet does not exceed 6mm, and the diffusion depth does not exceed 500μm.
In addition, the existing methods still have the problems of easy agglomeration of magnetic powder and uneven distribution of heavy rare earth elements.

Method used

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  • Preparation method of sintered neodymium-iron-boron magnet
  • Preparation method of sintered neodymium-iron-boron magnet
  • Preparation method of sintered neodymium-iron-boron magnet

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Embodiment 1

[0029] In this embodiment, the preparation process of the sintered NdFeB magnet is as follows:

[0030] (1) Quick-setting: NdFeB Nd is prepared by mixing and melting raw materials and casting copper rollers 33 Fe bal B 0.95 Cu 0.2 For the quick-setting sheet, the copper roller rotates at a speed of about 1.4m / s, and the thickness of the obtained quick-setting sheet is about 300μm.

[0031] (2) Powder making: hydrogen crush the quick-setting tablet into NdFeB alloy powder with an average particle size of 0.1mm-1mm, and then use the hydrogen crushing process to make the powder into magnetic powder with an average particle size of about 2.0 μm.

[0032] (3) Mixing: dissolving the heavy rare earth organic compound in an organic solvent and ultrasonically dispersing it to obtain a mixture. The heavy rare earth organic compound is dysprosium isopropoxide, and the organic solvent is absolute ethanol. Then mix the mixture with the magnetic powder prepared in step (2), stir evenly...

Embodiment 2

[0048] In this embodiment, the preparation process of the sintered NdFeB magnet is as follows:

[0049] (1) Quick-setting: NdFeB (Pr 0.2 Nd 0.8 ) 30.5 Al 0.2 Cu 0.04 Fe bal B 1 For the quick-setting sheet, the speed of the copper roller is about 1.4m / s, and the thickness of the obtained quick-setting sheet is about 300μm.

[0050] (2) Powder making: hydrogen crush the quick-setting tablet into NdFeB alloy powder with an average particle size of less than 1 mm, and then use the hydrogen crushing process to make the powder into a powder with an average particle size of about 3 μm.

[0051] (3) Mixing: Under an anhydrous and oxygen-free environment, dissolve the heavy rare earth halide in an organic solvent to obtain a solution with a concentration of 2 g / L. The heavy rare earth halide is terbium chloride, and the organic solvent is absolute ethanol. Then mix the solution with the magnetic powder prepared in step (2), disperse evenly by ultrasonic, wherein the heavy rare ...

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Abstract

The invention discloses a preparation method of a sintered neodymium-iron-boron magnet. A solution coating method is adopted for mixing alloy magnetic powder with an organic turbid liquid or an organic solution containing heavy rare earth elements, so that the heavy rare earth elements uniformly coat the peripheries of magnetic powder particles; and then molding and sintering tempering treatment is carried out for effectively controlling the heavy rare earth elements on the surface layers and the crystal boundaries of crystal particles, so that the distribution uniformity and the diffusion depth of the heavy rare earth elements in the sintered neodymium-iron-boron magnet can be improved, and the magnetic properties such as the coercive force and the like can be improved.

Description

technical field [0001] The invention relates to the technical field of sintering of rare earth permanent magnets, in particular to a preparation method of sintered NdFeB magnets. Background technique [0002] Sintered NdFeB rare earth permanent magnet is the permanent magnet material with the highest magnetic energy product and the most widely used found so far. In order to meet the market demand for high-performance magnets for new energy vehicles and wind power generation, the application of sintered NdFeB magnets in the market field has been further expanded. The improvement of coercive force and magnetic energy product has promoted the rapid growth of sintered permanent magnets in the motor market. [0003] Adding heavy rare earth elements to sintered NdFeB magnets is a method widely studied to improve the coercivity and energy product of magnets. The added technical means include: smelting alloy method, double alloy method, and grain boundary diffusion method. In rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02C22C38/06C22C38/16C22C38/10C22C38/12
CPCC22C38/002C22C38/005C22C38/06C22C38/10C22C38/12C22C38/16H01F1/0577H01F41/0293
Inventor 张秋爽郭帅闫阿儒陈仁杰曹学静丁广飞杨潇曾基灵
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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