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A kind of method for preparing NdFeB precision permanent magnet

A neodymium-iron-boron and permanent magnet technology, which is applied in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of waste of rare earth resources and easy aging, and achieve the effect of saving rare earth resources and high dimensional accuracy.

Active Publication Date: 2017-12-01
宁波市易赞磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the three existing NdFeB technologies: powder sintered NdFeB can only produce blanks and wire cutting and grinding processes are required, which wastes rare earth resources; NdFeB prepared by hot pressing and heat deformation Blanks also need wire cutting and grinding to ensure the dimensional accuracy of permanent magnets; powder bonded NdFeB is prone to aging due to polymer materials, so the NdFeB permanent magnets prepared by the method of the present invention do not contain polymer materials, and the prepared Permanent magnets have high dimensional accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The composition of NdFeB is Nd 9 Fe 73 Ti 4 C 2 B 12 Prepare the alloy first, then vacuum 10 -3 Pa~10 -2 Pa refilled with argon, and then through magnetic levitation smelting combined with circulating cooling superheating method to obtain a stable deep supercooling degree for the alloy melt, the NdFeB ingot melting temperature is 1300 ° C, keep the temperature for 30 seconds, and then immediately use the metal mold to absorb and cast into neodymium Iron-boron amorphous tube, the tube wall is 0.5mm thick; the size of the required amorphous tube billet is calculated according to the volume of the permanent magnetic ring, and the amorphous suction casting tube billet blanked according to the calculation is put into the mold, and the first vacuum is 10 -3 Pa~10 -2 Pa refilled with argon, then heated and kept at 603°C for 240 seconds, followed by 8X10 -4 Compress the amorphous precision magnetic ring at a deformation rate of / s, and then eject the mold; warm the amorp...

Embodiment 2

[0017] (Nd 0.75 PR 0.25 ) 9 Fe 70 Ti 3 Nb 3 C 2 B 13 To prepare and melt NdFeB ingots, first vacuum 10 -3 Pa~10 -2 Pa refilled with argon, the alloy melt obtains a stable deep supercooling degree through the circulation cooling superheating combined with the molten glass purification method, the NdFeB ingot melting temperature is 1700 ℃, keep the temperature for 30 seconds, and then immediately use the metal mold to suck and cast into neodymium Iron-boron amorphous rod, rod diameter 1.1mm; according to the size of the required amorphous rod calculated according to the volume of the precision permanent magnet, the amorphous suction casting billet blanked according to the calculation is put into the mold, and vacuum 10 -3 Pa~10 -2 Pa refilled with argon, then heated and held at a temperature range of 672°C for 30 seconds, followed by 1X10 -3 / s deformation rate to press into an amorphous magnet, and then eject the mold; heat the amorphous magnet at 784°C for 1 minute t...

Embodiment 3

[0019] (Nd 0.9 Dy 0.1 ) 9 Fe 70 Ti 3 Nb 3 C 2 B 13 To prepare and melt NdFeB ingots, first vacuum 10 -3 Pa~10 -2 Pa refilled with argon, and the alloy melt can obtain a stable deep supercooling degree through the circulation cooling superheating combined with the molten glass purification method. The melting temperature of the NdFeB ingot is 1650 ℃, and it is kept for 60 seconds, and then it is immediately sucked and cast into NdFeB Iron-boron non-wafer, the sheet thickness is 1.2mm; calculate the size of the required non-wafer according to the volume of the precision permanent magnet, put the amorphous sucking casting blank that is cut according to the calculation into the mold, and first vacuum 10 -3 Pa~10 -2 Pa refilled with argon, then heated and kept at a temperature range of 650°C for 70 seconds, followed by 5X10 -4 Press the amorphous magnet at a deformation rate of / s, and then eject the mold; heat the amorphous magnet at 765°C for 3 minutes to obtain a preci...

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Abstract

A method for preparing precise NdFeB permanent magnets belongs to the technical field of rare earth permanent-magnet material preparation, and comprises the following steps: smelting NdFeB; carrying out operation according to at least one of a glass fluxing technique-combined circulation cooling and overheating method, and a circulation cooling and overheating-combined magnetic levitation smelting method to ensure that the alloy melt is stable in deep-supercooling degree; carrying out smelting and suction-casting to obtain amorphous blanks; pressing at a certain strain rate to obtain amorphous magnet bodies; and finally, carrying out crystallization to obtain the precise NdFeB permanent magnets. Compared with the prior art, the method provided by the invention has the obvious superiority that the NdFeB permanent magnets prepared according to the method contain no polymer material which is contained in bonded NdFeB magnets; and compared with sintered NdFeB magnet power and hot pressed / hot deformed NdFeB magnets, the NdFeB permanent magnets prepared according to the method are free of line cutting and grinding, and high in dimensional precision.

Description

technical field [0001] The invention relates to the technical field of permanent magnet material processing, and relates to a method for preparing an NdFeB precision permanent magnet. Background technique [0002] It is well known that the existing NdFeB permanent magnets prepared by powder sintering technology have low dimensional accuracy. Generally, NdFeB magnets prepared by powder sintering are called blanks. Two processes of wire cutting and grinding are specially added to ensure the size of the permanent magnets. However, wire cutting and grinding have caused a lot of waste of precious rare earth resources and increasing environmental pressure. From the perspective of green development, can a precision preparation method for NdFeB permanent magnets be developed? [0003] The second preparation method of existing NdFeB is the process of preparing NdFeB magnets by hot pressing and thermal deformation, but the prepared NdFeB also needs wire cutting and grinding processes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057C22C45/02C22C33/02
CPCC22C33/02C22C45/02H01F1/0576H01F41/0253
Inventor 潘晶刘新才杨梦琳
Owner 宁波市易赞磁业有限公司
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