High-magnetic performance NdFeB magnet capable of cyclically utilizing waste material and fabrication method of NdFeB magnet

A technology of NdFeB magnets, which is applied in the field of high-magnetic NdFeB magnets and their preparation, and can solve problems such as uneven distribution of NdFeB magnet components, uneven magnetic force distribution of NdFeB magnets, and uneven heating of blanks. , to achieve the effect of balanced quality, reasonable structure and uniform heating

Active Publication Date: 2018-11-30
杭州双成磁业有限公司
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Problems solved by technology

[0003] The present invention provides a high magnetic performance NdFeB magnet and its preparation method for recycling waste materials, which mainly solves the problem of uneven distribution of components of NdFeB magnets in the p

Method used

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  • High-magnetic performance NdFeB magnet capable of cyclically utilizing waste material and fabrication method of NdFeB magnet
  • High-magnetic performance NdFeB magnet capable of cyclically utilizing waste material and fabrication method of NdFeB magnet
  • High-magnetic performance NdFeB magnet capable of cyclically utilizing waste material and fabrication method of NdFeB magnet

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Embodiment

[0026] Example: In this example, a high-magnetic-performance neodymium iron boron magnet recycled from waste materials. The composition of the neodymium iron boron magnet is: 127.66kg of N52HT, 259.19kg of old SH material, and 13.15kg of Pr-Nd, such as figure 1 , The neodymium iron boron magnet includes an arc-shaped magnet body 1, two ends of the magnet body are respectively provided with a notch 2, the middle of the magnet body is provided with a protrusion 3, and both ends of the protrusion are provided with arc-shaped grooves 4 at the roots. A mounting cup hole 5 is opened in the middle of the magnet body, and the mounting cup hole is located above the bump 3.

[0027] A preparation method of high-magnetic-performance neodymium iron boron magnets recycled from waste materials, and the steps are as follows:

[0028] a. Put the powders of each component of claim 1 into a vacuum quick-setting furnace according to the ratio for casting, so that the thickness of the casting is 0.16-0...

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Abstract

The invention relates to a fabrication method of a magnet, in particular to a high-magnetic performance NdFeB magnet capable of cyclically utilizing a waste material and a fabrication method of the NdFeB magnet. By the NdFeB magnet, the technical problems that each constituent of the NdFeB magnet in the prior art is not uniform in distribution during sintering and a blank is also not uniform in heating during sintering to cause that the produced NdFeB magnet is not uniform in magnetic force distribution and relatively low in magnetic performance are solved. The high-magnetic performance NdFeBmagnet is fabricated according to the steps of putting each constituent powder into a vacuum rapid-hardening furnace for casting, sending the casting into a hydrogen decropitation furnace for hydrogendecropitation, sending hydrogen broken powder into an automatic magnetic field press machine, performing press formation and isostatic pressing under an orientated magnetic field with magnetic fieldintensity being 1.4-2.0T, placing the formed blank in a vacuum sintering furnace for three-segment sintering, placing the sintered blank in a grinding machine for double-sided grinding, performing line cutting after light blank verification, and performing formation, black wafer verification and finished product verification.

Description

Technical field [0001] The invention relates to a preparation method of a magnet, in particular to a neodymium iron boron magnet with high magnetic properties recycled from waste and a preparation method thereof. Background technique [0002] In order to meet the needs of the market or terminal applications, NdFeB magnets are usually made of sheet casting raw materials, after hydrogen crushing and jet pulverization steps, magnetic field shaping and alignment, sintering and heat treatment steps to produce a square (rectangular) sintered blank, and then pass Processing and grinding methods make the required magnet shape, such as tile shape, circular ring or fan shape, etc. The Chinese patent discloses a method (publication number: CN103866127B) for preparing neodymium iron boron from waste materials containing neodymium iron boron, which includes the following steps: 1) waste pretreatment: take the waste materials containing neodymium iron boron and put them into decontamination U...

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F1/0577H01F41/0266
Inventor 陈艺炜
Owner 杭州双成磁业有限公司
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