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Wear-resisting neodymium-iron-boron permanent magnet material and preparation method thereof

A permanent magnet material, neodymium iron boron technology, applied in the direction of magnetic materials, inorganic material magnetism, inductance/transformer/magnet manufacturing, etc., can solve the problems of low Curie temperature and coercive force, so as to improve the coercive force and apply The effect of increasing the range and reducing the void ratio

Inactive Publication Date: 2013-03-20
NINGBO STAR MATERIALS HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a heat-resistant NdFeB permanent magnet material to overcome the problems of low Curie temperature and coercive force of existing NdFeB permanent magnets, and at the same time reduce the use of heavy rare earth materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation method comprises the following steps:

[0029] After melting iron or steel with a carbon content of not more than 2% by weight, manganese, cobalt, boron, neodymium-iron alloy, dysprosium-iron alloy, samarium-iron alloy are added in turn to melt and fully mix, then cast into an alloy ingot, and then through crushing Machine crushing, and then use hemp to grind into powder, the average particle size of the powder is below 10 microns;

[0030] The yttrium-iron alloy is pulverized so that the average particle size is less than 2 microns;

[0031] Select nano-scale silicon powder with a particle size of less than 100 nanometers;

[0032] Mix the above powder in a mixer for 2-4 hours;

[0033] Press molding with a mold in a constant magnetic field environment, and then press it into a blank under a pressure of 450-550MPa;

[0034] Pre-fire the blank at 400-500°C for 1-3 hours in vacuum; cool down to 150-250°C at a constant speed and then shape it; then put ...

Embodiment 1

[0038] A heat-resistant NdFeB permanent magnet material, comprising an NdFeB matrix, the NdFeB matrix is ​​composed of 25% neodymium, 1% cobalt, 1.5% silicon, 2% Manganese, 10% boron and iron of the balance; said NdFeB permanent magnet material also adds dysprosium-iron alloy comprising 0.1% by weight percentage of NdFeB matrix, wherein dysprosium accounts for a percentage by weight of dysprosium in the dysprosium-iron alloy 5% and 0.5% samarium-iron alloys, wherein samarium in the samarium-iron alloy accounts for 5% by weight, and 1.5% yttrium-iron alloy, wherein the weight percentage of yttrium in the yttrium-iron alloy accounts for 10%.

Embodiment 2

[0040] A heat-resistant NdFeB permanent magnet material, comprising an NdFeB matrix, the NdFeB matrix is ​​composed of 26.5% neodymium, 0.5% cobalt, 1% silicon, 2.5% manganese, 10.5% boron and iron of the balance; the NdFeB permanent magnet material is also added and comprises 0.3% dysprosium-iron alloy according to the weight percentage of the NdFeB matrix, wherein dysprosium accounts for the weight percentage in the dysprosium-iron alloy is 5% and 0.3% samarium-iron alloys, wherein samarium accounts for 5% by weight in the samarium-iron alloy, and 2.5% yttrium-iron alloy, wherein the weight percentage of yttrium in the yttrium-iron alloy accounts for 10%.

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PUM

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Abstract

The invention relates to a wear-resisting neodymium-iron-boron permanent magnet material and a preparation method thereof. The wear-resisting neodymium-iron-boron permanent magnet material comprises a neodymium-iron-boron base body, wherein the neodymium-iron-boron base body comprises the following components in atom mass percentage of 25-26.5% of neodymium, 0.5-1% of cobalt, 1-1.5% of silicon, 2-2.5% of manganese, 10-10.5% of boron and residual amount of iron. The following components are further added into the neodymium-iron-boron permanent magnet material according to the weight percentage of the neodymium-iron-boron base body: 0.1-0.3% of dysprosium-iron alloy, 0.3-0.5% of samarium-iron alloy and 1.5-2.5% of yttrium-iron alloy.

Description

technical field [0001] The invention belongs to the field of magnetic materials, in particular to a heat-resistant NdFeB permanent magnet material and a preparation method thereof. Background technique [0002] In the prior art, NdFeB permanent magnets have the widest application range, but they cannot be used in certain high-temperature environments. Because the Curie temperature of NdFeB permanent magnets is low, and at the same time, the coercive force of this type of magnet is also low. The Curie temperature is generally below 150°C, and the coercive force is below 1500KA / m. In order to be able to be used in a high temperature environment, samarium-cobalt permanent magnets are basically used, and the cost of samarium-cobalt permanent magnets is relatively high, which is not conducive to popularization and application. [0003] The existing technology proposes to use the existing NdFeB magnet as the base and add some auxiliary elements to increase the Curie temperature a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08H01F41/02C22C38/10C22C33/02
Inventor 潘道良关井和苏广春
Owner NINGBO STAR MATERIALS HI TECH
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