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Neodymium-iron-boron magnetic powder and preparation method thereof

A neodymium iron boron and magnetic powder technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., to avoid local demagnetization effect, reduce the probability of magnetic powder oxidation, and achieve the effect of uniform composition

Pending Publication Date: 2021-08-10
东阳市银海磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the technology of preparing NdFeB magnetic powder by quick quenching + crushing method is relatively mature, there is still room for optimization in the microstructure, oxygen content, morphology and particle size of the prepared magnetic powder, and the magnetic properties are expected to be further improved.

Method used

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  • Neodymium-iron-boron magnetic powder and preparation method thereof
  • Neodymium-iron-boron magnetic powder and preparation method thereof
  • Neodymium-iron-boron magnetic powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A novel method for preparing NdFeB magnetic powder, the specific steps are as follows:

[0038] 1. Ingredients smelting, smelting Nd-Fe-B alloy ingots or quick-setting sheets, the mass percentage of Nd, Fe, and B is as follows: Nd: 26.8%, B: 1.1%, and the rest is Fe. The melting process is quick-setting, smelting Argon protection during the process.

[0039] 2. Coarse crushing is convenient for the subsequent smelting process of the rapid quenching and spinning belt. The ingot or quick-setting sheet prepared in step 1 is broken into fine particles with a particle size of 13-48mm. The crushing equipment is a jaw crusher.

[0040] 3. Rapid quenching and stripping to obtain amorphous NdFeB thin strips. Add the coarsely crushed magnetic powder in step 2 to an induction furnace under argon protection for melting, and then perform rapid quenching and stripping treatment to obtain amorphous thin strips. bring.

[0041] 4. Tempering treatment to improve the homogenization of ...

Embodiment 2

[0056] A novel method for preparing NdFeB magnetic powder, the specific steps are as follows:

[0057] 1. Ingredients smelting, smelting Nd-Fe-B alloy ingots or quick-setting sheets, Nd, Fe, and B mass percentages are Nd: 27.2%, B: 1.24%, and the rest is Fe. The smelting process is quick-setting, and the smelting process Medium argon protection.

[0058] 2. Coarse crushing is convenient for the subsequent smelting process of the rapid quenching and spinning belt. The ingot or quick-setting sheet prepared in step 1 is broken into fine particles with a particle size of 15-49mm. The crushing equipment is a jaw crusher.

[0059] 3. Rapid quenching and stripping to obtain amorphous NdFeB thin strips. Add the coarsely crushed magnetic powder in step 2 to an induction furnace under argon protection for melting, and then perform rapid quenching and stripping treatment to obtain amorphous thin strips. bring.

[0060] 4. Tempering treatment to improve the homogenization of the amorpho...

Embodiment 3

[0075] A novel method for preparing NdFeB magnetic powder, the specific steps are as follows:

[0076] 1. Ingredients smelting, smelting Nd-Fe-B alloy ingots or quick-setting sheets, the mass percentage of Nd, Fe, and B is as follows: Nd: 28.2%, B: 1.3%, and the rest is Fe. The smelting process is quick-setting, smelting Argon protection during the process.

[0077] 2. Coarse crushing is convenient for the subsequent smelting process of the quick quenching and spinning belt. The ingot or quick-setting sheet prepared in step 1 is broken into fine particles with a particle size of 11-39mm. The crushing equipment is a jaw crusher.

[0078] 3. Rapid quenching and stripping to obtain amorphous NdFeB thin strips. Add the coarsely crushed magnetic powder in step 2 to an induction furnace under argon protection for melting, and then perform rapid quenching and stripping treatment to obtain amorphous thin strips. bring.

[0079] 4. Tempering treatment to improve the homogenization of...

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Abstract

The invention belongs to the technical field of rare earth permanent magnetic materials, and discloses neodymium iron boron magnetic powder and a preparation method thereof. The method comprises the following steps: (1) ingredient smelting; (2) coarse crushing: crushing a cast ingot or a rapid hardening sheet prepared in the step (1) into fine particles; (3) rapid quenching and melt-spinning: adding magnetic powder obtained after coarse crushing in the step (2) into an induction furnace, smelting, and carrying out rapid quenching and melt-spinning treatment to obtain an amorphous neodymium iron boron thin strip; (4) tempering treatment, wherein the homogenization of the amorphous thin strip is improved, and the mechanical property of the material is improved; (5) secondary crushing and screening at low temperature; (6) crystallization treatment, so that the microstructure of the NdFeB thin strip is converted into nanocrystalline; and (7) salt mist aging treatment, so that the magnetic performance and oxidation resistance of the magnetic powder are improved. According to the method, through the working procedures of tempering treatment, low-temperature crushing treatment, neodymium-iron-boron magnetic powder crystallization, salt mist aging treatment and the like, the oxygen content of the neodymium-iron-boron magnetic powder is reduced, the sharp corner morphology of the magnetic powder is removed, the local demagnetization effect is avoided, and the maximum magnetic energy product is improved.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a neodymium-iron-boron magnetic powder and a preparation method thereof. Background technique [0002] Compared with sintered magnets, the permanent magnetic properties of bonded magnets are poor, but because they can be formed into net dimensions, they can be directly processed into complex shapes without cutting, grinding and other subsequent processing, and are more and more widely used, especially in The field of small motors that do not require high magnetic properties. According to the molding process, bonded magnets can be roughly divided into three categories: compression molding magnets, injection molding magnets, and flexible magnets (calendered or extruded). According to the material system, bonded magnets can be divided into bonded rare earth permanent magnets, bonded ferrite, etc. Among them, bonded NdFeB has a higher magnetic energy p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/057H01F41/02
Inventor 彭乙洪
Owner 东阳市银海磁业有限公司
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