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

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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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 prior art during sintering, and the unevenness of the blank during sintering. The heating is not uniform, so the produced NdFeB magnets have uneven magnetic force distribution, low magnetic performance and other technical problems.

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