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

A permanent magnet material, NdFeB technology, applied in the direction of magnetic materials, inorganic material magnetism, magnetic objects, etc., can solve the problems of limited application scope, remain unchanged, cannot be applied, etc., achieve small size, uniform grain size, The effect of high thermal stability

Active Publication Date: 2015-02-25
东阳市亿力磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the maximum operating temperature is too low, its application range will be greatly limited
For example, the maximum operating temperature of ordinary NdFeB magnets is 80°C, which limits their application to motors and other areas with high ambient temperatures; second, the temperature coefficient
In some fields, although the ambient temperature is not very high, it is required that the magnetic properties of the magnet remain basically unchanged when the ambient temperature changes, or can only be changed within the allowable range of the instrument error, such as magnets used in industries such as precision instruments

Method used

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  • Heat-resisting sintered neodymium iron boron permanent magnet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: (1) According to the weight percentage, Nd19.8%, B0.78%, Cu0.48%, Co0.98%, Ga0.43%, Nb0.69%, Dy2.8%, Al0.25%, and the balance is Fe ratio raw material , put the raw material into a vacuum quick-setting throwing belt furnace, and smelt it into thin slices with a thickness between 0.2 and 0.3 mm;

[0018] (2) Put the flakes in step (1) into a hydrogen furnace, and dehydrogenate them at 530°C for 4 hours to make a coarse powder; then pass through a jet mill to make a magnetic powder with an average particle size of 2.5-2.8 μm;

[0019] (3) Mix nano-iron powder with a particle size of 40-50nm and nano-strontium titanate with a particle size of 80-100nm at a ratio of 4:3 by weight, add it to the wi84564 nano-scale dispersion grinder, and grind and mix for 2-3 hours , to obtain nano-mixed powder A; the particle size is 40 ~ 50nm nano-vanadium nitride, the magnetic powder in step (2), mixed according to the ratio of 4:9 by weight percentage, added to wi84564 nano-sc...

Embodiment 2

[0022] Example 2: (1) According to the weight percentage, Nd 18.6%, B 0.73%, Cu 0.44%, Co 0.95%, Ga 0.41%, Nb 0.67%, Dy 2.6%, Al 0.23%, and the balance is Fe proportioning raw materials, Put the raw material into a vacuum quick-setting throwing belt furnace, and smelt it into thin slices with a thickness of 0.2-0.3mm;

[0023] (2) Put the flakes in step (1) into a hydrogen furnace, and dehydrogenate at 510-530°C for 4 hours to make coarse powder; then pass through jet mill to make magnetic powder with an average particle size of 2.5-2.8 μm;

[0024] (3) Mix nano-iron powder with a particle size of 40-50nm and nano-strontium titanate with a particle size of 80-100nm at a ratio of 4:3 by weight, add it to the wi84564 nano-scale dispersion grinder, and grind and mix for 2-3 hours , to obtain nano-mixed powder A; the particle size is 40 ~ 50nm nano-vanadium nitride, the magnetic powder in step (2), mixed according to the ratio of 4:9 by weight percentage, added to wi84564 nano-sca...

Embodiment 3

[0027] Example 3: (1) According to the weight percentage, Nd 23.1%, B 0.81%, Cu 0.53%, Co 1.03%, Ga 0.46%, Nb 0.73%, Dy 3.1%, Al 0.29%, and the balance is Fe proportioning raw materials, Put the raw material into a vacuum quick-setting throwing belt furnace, and smelt it into thin slices with a thickness of 0.2-0.3mm;

[0028] (2) Put the flakes in step (1) into a hydrogen furnace, and dehydrogenate at 510-530°C for 4 hours to make coarse powder; then pass through jet mill to make magnetic powder with an average particle size of 2.5-2.8 μm;

[0029] (3) Mix nano-iron powder with a particle size of 40-50nm and nano-strontium titanate with a particle size of 80-100nm at a ratio of 4:3 by weight, add it to the wi84564 nano-scale dispersion grinder, and grind and mix for 2-3 hours , to obtain nano-mixed powder A; the particle size is 40 ~ 50nm nano-vanadium nitride, the magnetic powder in step (2), mixed according to the ratio of 4:9 by weight percentage, added to wi84564 nano-sca...

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Abstract

The invention relates to a heat-resisting sintered neodymium iron boron permanent magnet material and a preparation method thereof. Neodymium iron boron powder is composed of 18.6-23.1% of Nd, 0.73-0.81% of B, 0.44-0.53% of Cu, 0.95-1.03% of Co, 0.41-0.46% of Ga, 0.67-0.73% of Nb, 0.67-0.73% of Nb, 2.6-3.1% of Dy, 0.23-0.29% of Al and the balance Fe. The heat-resisting sintered neodymium iron boron permanent magnet material is prepared by adding nano-iron powder, nano strontium titanate and nano vanadium nitride into the neodymium iron boron powder with uniform mixing prior to sintering. The heat-resisting sintered neodymium iron boron permanent magnet material has the advantages that an optimal ingredient formula is adopted, appropriate nano elements are added, and through a special mixing manufacturing technique, a neodymium iron boron magnet which is high in performance and and heat stability can be produced; the neodymium iron boron magnet is small in size of grain boundary angle pair, more regular in shape and homogenized, refined and regular in crystalline grain, and the magnet has higher corrosion resistance and heat resistance.

Description

technical field [0001] The invention belongs to the field of magnetic functional materials, and in particular relates to a heat-resistant sintered NdFeB permanent magnet material and a preparation method thereof. Background technique [0002] Since the invention of NdFeB rare earth permanent magnet materials in 1983, it has immediately attracted the attention of magnetic material researchers, magnetic material manufacturers and application manufacturers all over the world, and the industrial production and application have achieved amazing development. Its application fields have covered electric power technology, telecommunication technology, automobile technology, computer technology, biomedicine and household appliances and other industries. Magnetic performance and stability are two important aspects to evaluate the technological advancement of permanent magnet materials. The stability of permanent magnet materials is mainly evaluated by temperature stability and time s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F9/04B22F3/16
Inventor 张乔木
Owner 东阳市亿力磁业有限公司
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