Method for using magnetic steel of waste permanent magnet motor to prepare high-performance regenerated sintered neodymium iron boron (NdFeB) magnet
A technology of permanent magnet motors and rare earth permanent magnet motors, which is applied in the fields of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., and can solve the problems of reduced maximum magnetic energy product of magnets, large volume fraction of neodymium-rich phase, and adverse effects on magnet performance, etc. problem, achieve the effect of recovering coercive force, repairing boundary defects, and good powder mixing effect
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Embodiment 1
[0024] (1) The magnet steel composition of waste rare earth permanent magnet motor is Nd 22.5 Dy 0.8 PR 7.1 Fe 67.8 co 0.7 Cu 0.1 B 1 . Place the scrap NdFeB magnets from which the coating has been removed in 5% nitric acid alcohol for 10 seconds, then clean them in alcohol solution and blow dry. Put the scrap magnetic steel in a vacuum tube furnace, carry out 150 ℃, 0.1MPa hydrogen pressure hydrogen absorption for 3 hours, 600 ℃, 1×10 -3 Pa was dehydrogenated for 10 hours to obtain NdFeB hydrogen explosion powder.
[0025] (2) The NdFeB magnetic powder is crushed to 3 microns by jet milling process.
[0026] (3) NdH nanopowders with an average particle size of 100 nanometers were prepared by physical vapor deposition technology.
[0027] (4) adding the neodymium hydride metal nano powder obtained in step (3) to the NdFeB raw material powder of step (2), the addition ratio of the neodymium hydride nano powder is 2% of the weight of the NdFeB raw material powder, and t...
Embodiment 2
[0052] (1) The magnet steel composition of waste rare earth permanent magnet motor is Nd 25.4 Dy 5 Fe 67.2 co 1.1 Cu 0.2 al 0.1 B 1 . Place the scrap NdFeB magnets from which the coating has been removed in 5% nitric acid alcohol for 10 seconds, then clean them in alcohol solution and blow dry. Put the scrap magnetic steel in a vacuum tube furnace, carry out 150 ℃, 0.1MPa hydrogen pressure hydrogen absorption for 3 hours, 600 ℃, 1×10 -3 Pa was dehydrogenated for 10 hours to obtain NdFeB hydrogen explosion powder.
[0053] (2) The NdFeB magnetic powder is crushed to 3 microns by jet milling process.
[0054] (3) NdH nanopowders with an average particle size of 500 nm were prepared by physical vapor deposition technology.
[0055] (4) adding the neodymium hydride metal nano powder obtained in step (3) to the NdFeB raw material powder of step (2), the addition ratio of the neodymium hydride nano powder is 4% of the weight of the NdFeB raw material powder, and the two pow...
Embodiment 3
[0080] (1) The magnet steel composition of waste rare earth permanent magnet motor is Nd 25.4 Dy 5 Fe 67.2 co 1.1 Cu 0.2 al 0.1 B 1 . Place the scrap NdFeB magnets from which the coating has been removed in 5% nitric acid alcohol for 10 seconds, then clean them in alcohol solution and blow dry. Put the scrap magnetic steel in a vacuum tube furnace, carry out 150 ℃, 0.1MPa hydrogen pressure hydrogen absorption for 3 hours, 600 ℃, 1×10 -3 Pa was dehydrogenated for 10 hours to obtain NdFeB hydrogen explosion powder.
[0081] (2) The NdFeB magnetic powder is crushed to 3 microns by jet milling process.
[0082] (3) NdH nanopowders with an average particle size of 300 nm were prepared by physical vapor deposition technology.
[0083] (4) adding the neodymium hydride metal nano powder obtained in step (3) to the NdFeB raw material powder of step (2), the addition ratio of the neodymium hydride nano powder is 3% of the weight of the NdFeB raw material powder, and the two pow...
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