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Method for preparing high coercive force sintering rare-earth-iron-p permanent magnetic material

A high-coercivity, permanent-magnet material technology, applied in the field of magnetic materials, can solve the problems of high-coercivity magnet's shape and size limitation, and the technology has not been reported. Effect

Active Publication Date: 2007-01-31
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a limitation in these patented technologies at the same time, that is, the high coercive force magnet prepared by the diffusion method has a great limitation on the outer dimension, and the thickness of the magnet cannot exceed 5 mm
In other words, only small-sized magnets can be fabricated using these techniques
However, there is no report on the technology of preparing such magnets with unlimited size.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use quick-setting technology to change the composition to Nd 30.0 Fe 67.5 co 1.4 B 1.1 (mass percentage content) of the alloy is prepared as flakes, and then the powder is made into a powder with an average particle size of 3 microns by using a hydrogen crushing-jet milling process. (referring to Chinese patent in detail: 93115008.6, patent name: rare earth-iron-boron permanent magnet material and the preparation method of this material, announcement date: on January 10th, 1996, publication number: CN 1114779A, following embodiment is the same, just existing The one common to the technology is not limited to that technology).

[0018] Afterwards, 1% by weight of terbium nano-powder with an average particle size of 10 nanometers (the detailed process of nano-powder preparation can refer to the patent applied by this research group in the early stage: 200510089080.3 Authorized announcement date: 2006.3.8, publication number: CN 1743103 Patent name: Rare earth nanopart...

Embodiment 2

[0026] Use quick-setting technology to change the composition to Nd 30.0 Fe 67.5 co 1.4 B 1.1 (mass percentage content) of the alloy is prepared as flakes, and then the powder is made into a powder with an average particle size of 4 microns by using a hydrogen crushing-jet milling process. Then, 3% by weight of dysprosium nanopowder with an average particle size of 30 nanometers was added to the above-mentioned initial powder, and the two powders were uniformly mixed by a mixer. The uniformly mixed powder was oriented in a magnetic field of 2.5T and pressed into shape. Then put the compact into a high vacuum sintering furnace, sinter at 1080°C for 3 hours, and then perform secondary heat treatment, wherein the primary heat treatment temperature is 900°C for 3 hours; the secondary heat treatment temperature is 700°C for 1 hr. That is, a sintered magnet was obtained. The magnetic properties and densities of the prepared magnets are listed in Table 2.

Embodiment 3

[0032] Use quick-setting technology to change the composition to Nd 30.0 Fe 67.5 co 1.4 B 1.1 (mass percentage content) of the alloy is prepared as flakes, and then the powder is made into a powder with an average particle size of 3 microns by using a hydrogen crushing-jet milling process. Then, 1% by weight of dysprosium nanopowder with an average particle size of 20 nanometers was added to the above-mentioned initial powder, and the two powders were uniformly mixed by a mixer. The uniformly mixed powder was oriented in a magnetic field of 2.5T and pressed into shape. Then put the compact into a high vacuum sintering furnace, sinter at 1100°C for 2 hours, and then perform secondary heat treatment, wherein the primary heat treatment temperature is 1000°C for 1 hr; the secondary heat treatment temperature is 550°C for 3 hr. That is, a sintered magnet was obtained. The magnetic properties and densities of the prepared magnets are listed in Table 3.

[0033] Terbiu...

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PUM

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Abstract

The invention relates to the method used to make rare earth-iron-boron permanent magnetic material with high coercive force which belongs to magnetic material field. The excellent magnetism of the NdFeB permanent magnetism will be obviously reduced while the working environment temperature rises. The invention includes the following steps: using rapid hardening slice technology to make NdFeB rapid hardening slice; smashing to powder with 3-5 micron; making terbium and dysprosium powder with 10-50nm; mixing them with 1-3% weight ratio; orientating at 2.5T magnetic field; processing secondary heat treatment after 2-4 hours sintering at 1050-1120 centigrade degree; the first order heat treatment is at 900-1000 degree centigrade for 1-3h; the secondary is at 550-700 degree centigrade for 1-3h. The invention has better coercive force and lower terbium and dysprosium content compared with the traditional NdFeB permanent magnetic material.

Description

technical field [0001] The invention discloses a method for preparing a rare earth-iron-boron permanent magnet material with high coercive force, which belongs to the technical field of magnetic materials. Background technique [0002] Sintered NdFeB permanent magnet (a typical representative of rare earth-iron-boron permanent magnet materials) is currently the permanent magnet material with the best magnetic properties. It is widely used in many fields such as automobiles, motors, instruments and medical equipment, and is the fastest growing magnetic material. kind of. However, this type of magnet generally has an obvious disadvantage, that is, it has poor temperature stability compared with permanent magnet materials such as samarium cobalt and alnico. In other words, the excellent magnetic properties of sintered NdFeB permanent magnets (including multiple parameters such as remanence, coercive force and magnetic energy product) will decrease significantly with the increa...

Claims

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Application Information

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IPC IPC(8): H01F1/08
Inventor 岳明张久兴张东涛曹爱利刘卫强
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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