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Preparation method of anisotropic neodymium iron boron magnetic body

An anisotropic, NdFeB technology, used in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as the reduction of magnetic properties, and achieve the effects of improving magnetic properties, increasing orientation, and increasing magnetic energy product

Inactive Publication Date: 2006-06-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although bonded NdFeB magnets have many advantages, the magnetic properties are reduced due to the addition of binders.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: After the anisotropic NdFeB magnetic powder is treated with a titanate coupling agent and mixed with an epoxy resin binder, it is put into a magnetic field press and pressed into shape. The amount of each material added is based on the weight ratio Magnetic powder: couple Linking agent: binder=100:0.5:2.5. The obtained compact was put into a furnace with a pulsed magnetic field of 5 T, the frequency of the pulsed magnetic field was 0.03 Hz, and cured at a temperature of 180° C. for 1 hour. The magnetic performance of this anisotropic bonded NdFeB magnet was measured, and compared with the sample without pulse magnetic field curing treatment, the maximum energy product (BH) max was increased by 11%.

Embodiment 2

[0017] Embodiment 2: The preparation steps in this embodiment are basically the same as the above-mentioned embodiment 1. The difference is that the curing furnace is fed with protective atmosphere argon, so that the curing process is carried out under the protection of argon and the action of a 5T pulsed magnetic field, and the frequency of the pulsed magnetic field is 0.1 Hz.

[0018] The pulse magnetic field curing treatment under the protection of the atmosphere has a great effect on improving the orientation degree of the bonded magnet. Compared with the sample without a protective atmosphere and no pulse magnetic field curing treatment, the maximum magnetic energy product (BH)max has increased by about 17 %.

Embodiment 3

[0019] Embodiment 3: This embodiment is basically the same as the above-mentioned Embodiment 1. The difference is: ①, the amount of each substance added is based on the weight ratio of magnetic powder: coupling agent: binder = 100: 1: 5; ②, the magnetic field used in the curing treatment is a constant magnetic field of 10T. ③. Curing: Curing at 150°C for 0.5 hours.

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Abstract

This invention relates to a preparation method for anisotropy bond NdFeB magnet including: mixing the anisotropy bond NdFeB powder, a binder and other additives to be pressed to an ingot then putting it into a curing furnace to be cured, in which, the magnetic field is a constant or a pulse magnetic field, the magnetic density is 1-100 Tesla, the frequency of the pulse magnetic field is 0.03-0.1Hz, the cured temperature is 100-250deg.C and the time is 10 minutes to 2 hours.

Description

technical field [0001] The invention relates to a preparation method of a bonded NdFeB magnet, in particular to a preparation method of an anisotropic bonded NdFeB magnet. Background technique [0002] NdFeB has achieved rapid development since its invention in 1983. This strong magnet has become an indispensable magnetic material in people's daily life. and basic materials for the electromechanical industry. [0003] According to the preparation method, NdFeB permanent magnet materials can be divided into two categories: sintered NdFeB and bonded NdFeB. The magnetic properties of sintered magnets are better, but the production process is more complicated, especially the processing is difficult, and the cost is correspondingly higher. Although the magnetic properties of bonded NdFeB magnets are reduced due to the addition of binders, they have many advantages such as easy mass production, easy forming of complex shapes, light specific gravity, and stable magnetic propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
Inventor 李瑛朱明原金红明姜娟杨秋平田野张小磊
Owner SHANGHAI UNIV
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