Method for using magnetic steel of waste permanent magnet motor to prepare high-performance high-coercivity regenerated sintered neodymium iron boron (NdFeB) magnet
A technology of permanent magnet motor and high coercive force, which is applied in the fields of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., and can solve the problem of the reduction of the maximum magnetic energy product of the magnet, the adverse effects of the magnet performance, and the large volume fraction of the neodymium-rich phase, 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) Preparing praseodymium hydride nanopowder with an average particle size of 100 nanometers by using physical vapor deposition technology.
[0027] (4) adding the praseodymium hydride metal nano powder obtained in step (3) to the NdFeB raw material powder of step (2), the addition ratio of the praseodymium hydride nano powder is 2% of the weight of the NdFeB ra...
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) Preparing praseodymium hydride nanopowder with an average particle size of 500 nanometers by physical vapor deposition technology.
[0055] (4) adding the praseodymium hydride metal nano powder obtained in step (3) to the NdFeB raw material powder of step (2), the addition ratio of the praseodymium hydride nano powder is 4% of the NdFeB raw material powder weig...
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) Preparing praseodymium hydride nanopowder with an average particle size of 300 nanometers by physical vapor deposition technology.
[0083] (4) adding the praseodymium hydride metal nano powder obtained in step (3) to the NdFeB raw material powder of step (2), the addition ratio of the praseodymium hydride nano powder is 3% of the NdFeB raw material powder weig...
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