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A kind of neodymium iron boron magnet and preparation method thereof

A neodymium iron boron, magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high cost, content, magnetic energy product and remanence reduction, etc., to reduce the amount of addition, reduce manufacturing cost effect

Active Publication Date: 2020-12-11
ANHUI HANHAI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of serious reduction of magnetic energy product and remanence, containing strategic metal cobalt, and high cost.

Method used

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  • A kind of neodymium iron boron magnet and preparation method thereof

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Effect test

Embodiment 1

[0023] A kind of preparation method of neodymium iron boron magnet, comprises the following steps:

[0024] (1) After the iron is melted, boron, neodymium-iron alloy, and dysprosium-iron alloy are added in turn to melt and mix well, then cast into flakes, and place the flakes in a hydrogen crushing furnace for hydrogen crushing to obtain an alloy powder with an average particle size of 3 μm material;

[0025] (2) adding powdered aluminum-erbium alloy to the powder in step (1), the average particle diameter of the described aluminum-erbium alloy is 1 μm, and mixed under the protection of nitrogen atmosphere to obtain the powder mixture;

[0026] (3) Put the powder mixture into a forming press mold under the protection of nitrogen and apply a magnetic field for orientation, then use the mold to press the above powder mixture into a blank, and press the blank into a blank at 450°C Pre-fired for 2 hours under vacuum conditions, then cooled to 190°C for post-shaping treatment, and...

Embodiment 2

[0030] A kind of preparation method of neodymium iron boron magnet, comprises the following steps:

[0031] (1) After the iron is melted, boron, neodymium-iron alloy, and dysprosium-iron alloy are added in turn to melt and mix thoroughly, then cast into flakes, and put the flakes in a hydrogen crushing furnace for hydrogen crushing to obtain alloy powder with an average particle size of 1 μm material;

[0032] (2) adding powdered aluminum-erbium alloy to the powder in step (1), the average particle diameter of the described aluminum-erbium alloy is 1 μm, and mixed under the protection of nitrogen atmosphere to obtain the powder mixture;

[0033] (3) Put the powder mixture into the molding press mold under the protection of nitrogen and apply a magnetic field for orientation, then use the mold to press the above powder mixture into a blank, and press the blank at 400 ° C Pre-fired under vacuum conditions for 1h, then cooled to 180°C for post-shaping treatment, and then placed ...

Embodiment 3

[0037] A kind of preparation method of neodymium iron boron magnet, comprises the following steps:

[0038] (1) After the iron is melted, boron, neodymium-iron alloy, and dysprosium-iron alloy are added in turn to melt and mix thoroughly, then cast into flakes, and place the flakes in a hydrogen crushing furnace for hydrogen crushing to obtain an alloy powder with an average particle size of 5 μm material;

[0039] (2) adding powdered aluminum-erbium alloy to the powder in step (1), the average particle diameter of the described aluminum-erbium alloy is 2 μm, and mixed under the protection of nitrogen atmosphere to obtain the powder mixture;

[0040] (3) Put the powder mixture into a forming press mold under the protection of nitrogen and apply a magnetic field for orientation, then use the mold to press the above powder mixture into a blank, and press the blank at 500 ° C Pre-fired for 2 hours under vacuum conditions, then cooled to 200 ° C for post-shaping treatment, and then...

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Abstract

The invention belongs to the technical field of magnet preparation, and particularly relates to a neodymium iron boron magnet and a preparation method thereof. The preparation method comprises the steps that 1, after iron or steel is molten, boron, neodymium-iron alloy and dysprosium-iron alloy are sequentially added, melted, fully mixed and cast into a flake, and the flake is crushed into powder;2, aluminum-erbium alloy is added and mixed under the protection of an inert gas atmosphere to obtain a powder mixture; 3, the powder mixture is subjected to compression molding through a mold and prepared into a blank, the blank is pre-sintered in the vacuum condition, then cooling and post-shaping treatment are carried out, then the blank is placed into a vacuum furnace for sintering, and the neodymium iron boron magnet is obtained after cooling. Through addition of the erbium element and the preparation technology matched with the erbium element, added rare earth is distributed in a grainboundary phase, so that the purpose of sufficient utilization is achieved; on the premise that the comprehensive performance of the neodymium iron boron magnet is ensured, the addition quantity of rare earth elements is reduced, and the manufacturing cost of the neodymium iron boron magnet is reduced.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to a neodymium-iron-boron magnet and a preparation method thereof. Background technique [0002] NdFeB magnets, as the third generation rare earth permanent magnet materials, are widely used in energy, transportation, machinery, medical, IT, home appliances and other industries. NdFeB magnets are tetragonal crystals formed of neodymium, iron, and boron. According to the preparation method, they are classified into bonded NdFeB and sintered NdFeB. The so-called bonded NdFeB is actually injection molding. Sintering is formed by heating at high temperature under vacuum conditions. [0003] The existing high-performance sintered NdFeB magnets mainly have two structures. In the sintered NdFeB magnet with one structure, heavy rare earth elements (at least one of Dy and Tb) are uniformly distributed inside the magnet. The structure is obtained by In the smelting pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C33/02
CPCC22C33/0278H01F1/0577H01F41/0253H01F41/0266
Inventor 刘竞成
Owner ANHUI HANHAI NEW MATERIAL