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Sintered NdFeB (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 permanent magnet material corrosion resistance and high temperature resistance can not be improved at the same time, to achieve durable Good corrosion performance

Active Publication Date: 2010-12-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings that the corrosion resistance and high temperature resistance of permanent magnet materials in the prior art cannot be improved at the same time, and to provide a sintered NdFeB permanent magnet with good corrosion resistance and high temperature resistance. Magnetic material and its preparation method

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment is used to illustrate the NdFeB permanent magnet material provided by the present invention and its preparation method.

[0040] 1) The NdFeB alloy adopts the quick-setting sheet technology, the surface line speed of the copper roller is 1.5 m / s, and the composition is (PrNd) 10.61 Dy 3.5 Fe 77.55 B 5.87 co 1.68 al 0.5 Cu 0.16 Ga 0.13 (a%), the thickness of the strip is about 0.3 mm.

[0041] 2) Hydrogen crushing in a hydrogen crushing furnace, absorb hydrogen to saturation at room temperature, dehydrogenate at 550°C for 6 hours to make hydrogen crushed powder, and then use jet mill under nitrogen protection to make powder with an average particle diameter of 3.5 microns.

[0042] 3) CoFe with an average particle diameter of 50 nm 2 o 4 Add to NdFeB alloy powder, and add antioxidant (produced by Shenyang Chemical Industry). The dosage of the cobalt ferrite is 1% of the weight of the NdFeB alloy powder, and the dosage of the antioxidant poly is ...

Embodiment 2

[0048] This embodiment is used to illustrate the NdFeB permanent magnet material provided by the present invention and its preparation method.

[0049] Carry out according to embodiment 1, the difference is that the Co used 2 Fe 1 o 4 The cobalt ferrite in Example 1 was replaced by cobalt ferrite, and the added amount of cobalt ferrite accounted for 5% by weight of the NdFeB alloy powder. The NdFeB permanent magnet material T2 was prepared.

Embodiment 3

[0051] This embodiment is used to illustrate the NdFeB permanent magnet material provided by the present invention and its preparation method.

[0052] Carry out according to embodiment 1, the difference is that CoFe 2 o 4 The average particle diameter is 100 nanometers to prepare NdFeB permanent magnet material T3.

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Abstract

The invention provides an NdFeB (neodymium iron boron) permanent magnet material, which contains an NdFeB alloy and a cobalt ferrite. The invention also provides a method for preparing the NdFeB permanent magnet material. The method comprises the following steps of: performing magnetic field-oriented compression moulding on a mixture of the NdFeB alloy and the cobalt ferrite; and sintering and tempering the mixture under the condition of vacuum or inert gas protection so as to obtain the NdFeB permanent magnet material. The method can prepare a sintered NdFeB permanent magnet material which has the advantages of corrosion resistance and high working temperature.

Description

technical field [0001] The invention relates to a sintered NdFeB permanent magnet material and a preparation method thereof. Background technique [0002] In the 1980s, Japan's Sumitomo Metal Corporation invented NdFeB permanent magnet materials for the first time. Since its inception, NdFeB permanent magnet materials have been widely used in automobiles, computers, electronics, machinery, energy, medical equipment, etc. Numerous areas. In particular, NdFeB has a high cost performance ratio, so it has become an ideal material for the manufacture of magnetic functional devices with high efficiency, small size, and light weight, and has had a revolutionary impact on many application fields. But with the continuous expansion of application fields and technological progress. The performance requirements for permanent magnet materials are increasing day by day, in terms of operating temperature and corrosion resistance. [0003] Since the NdFeB permanent magnet material itsel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/16
CPCH01F1/11B22F3/087B22F2998/10B22F2999/00H01F41/0266H01F1/0577B22F3/1007B22F2003/248B22F2201/20B22F1/12
Inventor 宫清张志强张素荣杜鑫程晓峰
Owner BYD CO LTD
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