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Improvement method for coercive force of neodymium iron boron magnet

A neodymium-iron-boron and coercive force technology, applied in the field of neodymium-iron-boron magnet processing, can solve the problems of high cost and affect performance, and achieve the effects of low cost, fast film forming speed and high utilization rate

Inactive Publication Date: 2017-12-01
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a method for improving the coercive force of NdFeB magnets; mainly to solve the problems of high cost and affecting performance of existing methods for improving the coercive force of NdFeB magnets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1, 1) Place multiple NdFeB magnet flakes with a size of 20*20*2T in an argon protection chamber, and evenly sprinkle dysprosium powder with an average particle size of 2 microns on the surface of the NdFeB magnet flakes , the weight of dysprosium powder is 0.3% of the weight of the NdFeB magnet, and then the NdFeB magnet sheet sprinkled with Dy powder is moved to the halogen-tungsten lamp, and the halogen-tungsten lamp is turned on to rapidly heat the surface of the NdFeB magnet sheet, so that Dysprosium powder quickly forms a film on the surface of the NdFeB magnet and solidifies and adheres to the surface of the NdFeB magnet sheet; after cooling, turn the NdFeB magnet sheet over and sprinkle the dysprosium powder on the other side. The weight of the dysprosium powder is the magnet 0.3% of the weight, and then use the same lamp irradiation method to heat the surface of the NdFeB magnet sheet, so that the dysprosium powder quickly forms a film on the surface of t...

Embodiment 2

[0025] Example 2, 1) Place multiple NdFeB magnet sheets with a size of 20*20*2T in an argon chamber, and evenly sprinkle terbium powder with an average particle size of 300 microns on the surface of the NdFeB magnet sheets, and the terbium The weight of the powder is 0.3% of the weight of the NdFeB magnet, and then the NdFeB magnet sheet sprinkled with terbium powder is moved under the tungsten-halogen lamp, and the tungsten-halogen lamp is turned on to rapidly heat the surface of the NdFeB magnet, so that the terbium powder quickly Form a film on the surface of the NdFeB magnet and solidify and adhere to the surface of the NdFeB magnet sheet. After cooling, turn the NdFeB magnet sheet over and sprinkle terbium powder on the other side. The weight of the terbium powder is 0.3 of the weight of the magnet. %, and then use the same lamp irradiation method to heat the surface of the NdFeB magnet sheet, so that the terbium powder quickly forms a film on the surface of the NdFeB magn...

Embodiment 3

[0031] Example 3, 1) Place multiple NdFeB magnet sheets with a size of 20*20*10T in an argon chamber, and evenly sprinkle dysprosium powder with an average particle size of 200 microns on the surface of the NdFeB magnet sheets, and the dysprosium The weight of the powder is 1.0% of the weight of the NdFeB magnet sheet, and then the NdFeB magnet sheet sprinkled with dysprosium powder is moved under the laser cladding device, and the dysprosium powder on the surface of the NdFeB magnet sheet is laser clad, so that the dysprosium The powder quickly forms a film on the surface of the NdFeB magnet sheet and solidifies and adheres to the surface of the NdFeB magnet sheet. After cooling, turn the NdFeB magnet sheet over and sprinkle dysprosium powder on the other side. The weight of the dysprosium powder is NdFeB 1.0% of the weight of the iron-boron magnet sheet, and then use the same method to laser clad the dysprosium powder on the surface of the NdFeB magnet sheet, so that the dysp...

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Abstract

The invention relates to an improvement method for the coercive force of a neodymium iron boron magnet. The method is characterized by comprising the steps of firstly placing a neodymium iron boron magnet sheet into an argon protection cabin, uniformly spraying dysprosium, terbium or dysprosium-terbium alloy powder on the surface of the neodymium iron boron magnet, and heating rapidly to solidify the powder on the surface of the neodymium iron boron magnet into membranes; then sending the magnet into a vacuum furnace to perform thermal treatment, thus allowing heavy rare earth element to diffuse to the interior of the magnet along a grain boundary; therefore, the coercive force of the magnet is significantly improved. The method has the advantages that a utilization rate of heavy rare earth material is high, a heavy rare earth membrane layer is high in purity, and membrane forming speed is quick, so that the method is beneficial to production in batch, and the coercive force of the magnet is significantly improved after thermal treatment.

Description

Technical field: [0001] The invention relates to the technical field of NdFeB magnet processing, in particular to a method for improving the coercive force of NdFeB magnets. 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. At the same time, more high-end application fields require NdFeB magnets to be more miniaturized, lightweight and thin. On the other hand, NdFeB magnets are required to have higher remanence and coercive force. [0003] The coercive force of NdFeB magnets can be improved by adding terbium or dysprosium pure metals or dysprosium-terbium alloys to the alloy of sintered NdFeB magnets. As a result, the remanence of NdFeB magnets is significantly reduced, and the consumption of heavy rare earth elements is relatively large. [0004] by Nd 2 Fe 14 Dysprosium, terbium element or dysprosium-terbium alloy are infiltrated into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/057H01F41/0293C22C38/002C22C38/005H01F1/0577C22C2202/02H01F41/026
Inventor 彭众杰杨昆昆徐明锋柳光洋
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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