Gradient neodymium iron boron magnet and manufacturing method thereof

A production method, NdFeB technology, applied in the direction of magnets, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of poor controllability and large usage of heavy rare earth elements, and achieve strong controllability and effective performance The effect of high utilization rate and outstanding substantive features

Active Publication Date: 2018-11-27
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly solves the problem that the existing diffusion process improves the demagnetization resistance in the actual application process by increasing the overall coercive force of the magnet, the overall usage of heavy rare earth elements is relatively large, and the four parallel The method of coating the oxide of Dy or Tb on the surface of the magnetization direction has problems such as poor controllability

Method used

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  • Gradient neodymium iron boron magnet and manufacturing method thereof
  • Gradient neodymium iron boron magnet and manufacturing method thereof
  • Gradient neodymium iron boron magnet and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0033] Example 1, see figure 1 , 2 , 3, 4, 5, 6, the production method of the gradient NdFeB magnet is as follows:

[0034] Place a plurality of NdFeB magnet sheets 1 with a size of 20mm*20mm*5mm (T) tightly and evenly in the argon chamber in a vertical manner according to the magnetization direction, and put the terbium powder with an average particle size of 5 microns, uniformly Cover the surface of the NdFeB magnet sheet, the weight of terbium powder is 0.5% of the weight of the NdFeB magnet sheet, and then move the NdFeB magnet sheet 1 covered with the terbium powder layer 2 to the laser, and use the laser to clean the NdFeB magnet. The surface of the sheet 1 is irradiated within 2mm from the edge (the irradiation area accounts for about 36% of the coverage area of ​​the heavy rare earth powder), so that the terbium powder in this area is rapidly heated and solidified into a heavy rare earth film layer 3 and combined with the NdFeB magnet sheet 1 If adhesion occurs on th...

Embodiment 2

[0036] Example 2, see figure 1 , 2 , 3, 4, 5, 6, the production method of the gradient NdFeB magnet is as follows:

[0037] Place a plurality of NdFeB magnet sheets 1 with a size of 40mm*40mm*10mm (T) tightly and evenly in the argon chamber in a vertical manner according to the magnetization direction, and put the terbium powder with an average particle size of 100 microns, uniformly Cover the surface of the NdFeB magnet sheet, the weight of terbium powder is 2.0% of the weight of the NdFeB magnet sheet, and then move the NdFeB magnet sheet 1 covered with the terbium powder layer 2 to the laser, and use the laser to clean the NdFeB magnet. The area within 3mm from the edge of the sheet surface is irradiated (the irradiation area accounts for about 28% of the coverage area of ​​the heavy rare earth powder), so that the terbium powder in this area is rapidly heated and solidified into a heavy rare earth film layer 3 and adheres to the NdFeB magnet sheet 1 After cleaning the un...

Embodiment 3

[0039] Example 3, see figure 1 , 2 , 3, 4, 5, 6, the production method of the gradient NdFeB magnet is as follows:

[0040] Place a plurality of NdFeB magnet sheets 1 with a size of 80mm*20mm*5mm (T) tightly and evenly in the argon gas chamber in a vertical manner according to the magnetization direction, and evenly cover the dysprosium powder with an average particle size of 200 microns On the surface of the NdFeB magnet sheet, the weight of dysprosium powder is 0.5% of the weight of the NdFeB magnet sheet, and then the NdFeB magnet sheet 1 covered with the dysprosium powder layer 2 is moved under the laser, and the NdFeB magnet sheet is processed by the laser. The area within 2mm from the surface to the edge is irradiated (the irradiation area accounts for about 24% of the coverage area of ​​the heavy rare earth powder), so that the dysprosium powder in this area is rapidly heated and solidified into a heavy rare earth film layer 3 and combined with the NdFeB magnet sheet 1...

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Abstract

The invention discloses a gradient neodymium iron boron magnet and a manufacturing method thereof. The gradient neodymium iron boron magnet and the manufacturing method thereof are characterized in that a local area of a neodymium iron boron magnet sheet is covered with heavy rare earth elements and subjected to diffusion treatment to prepare the magnet with gradient change of performance; the gradient neodymium iron boron magnet can be divided into three different areas in the direction perpendicular to the magnetization direction according to the magnitude and change rule of coercive force,and the effect is achieved that the area close to the edge has the high coercive force, and the area close to the center has the low coercive force; the gradient neodymium iron boron magnet has the high coercive force by only conducting heavy rare earth diffusion treatment on the easy-to-demagnetize area at the edge of the magnet body without conducting diffusion treatment on other parts, and theuse quantity of the raw heavy rare earth material is low.

Description

Technical field: [0001] The invention relates to the technical field of NdFeB magnet processing, in particular to a gradient NdFeB magnet and a manufacturing method thereof. Background technique: [0002] Since the appearance of NdFeB magnets in 1983, they have been widely used in the fields of computers, automobiles, medical care, and wind power generation; NdFeB magnets will have a decrease in remanence during the application process, which has a negative impact on the application of NdFeB magnets. Bad effect. In many application fields, the demagnetization field of NdFeB magnets mainly acts on the edge area of ​​the magnet. Increasing the coercive force in this area can significantly improve the overall anti-demagnetization resistance of NdFeB magnets in the actual use process. [0003] At present, the diffusion process is widely used to increase the coercive force of NdFeB magnets. The conventional diffusion process is to place NdFeB magnets in an environment containing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F7/02
CPCH01F7/0215H01F41/0293H01F1/0577H01F1/0555
Inventor 杨昆昆彭众杰王传申
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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