MANUFACTURING METHOD OF A POWDER FOR COMPACTING RARE EARTH MAGNET AND THE RARE EARTH MAGNET OMITTING JET MILLING PROCESS

摘要

The present invention discloses manufacturing methods of a powder for compacting rare earth magnet powder and rare earth magnet that omit jet milling process, which comprises the steps as follows: 1) casting: casting the molten alloy of rare earth magnet raw material by strip casting method to obtain a quenched alloy with average thickness in a range of 0.2˜0.4 mm; 2) hydrogen decrepitation: decrepitating the quenched alloy and a plurality of rigid balls into a rotating hydrogen decrepitation container simultaneously, the quenched alloy is crushed under a hydrogen pressure between 0.01˜1 MPa, cooling the alloy and the balls, then screening the mixture to remove the rigid balls and obtain the powder. As the jet milling process is omitted, the oxygenation during the process of the jet milling may be avoided, therefore the process may be non-oxide, and the mass production of magnet with super high property may be possible.

主权项

1. A manufacturing method of a powder for compacting rare earth magnet omitting jet milling process, the rare earth magnet comprises R2T14B main phase, R is selected from at least one rare earth element including yttrium, and T is selected from at least one transition metal element including Fe; the method comprising the steps of:
1) casting: casting the molten alloy of rare earth magnet raw material by strip casting method to get a quenched alloy with average thickness in a range of 0.2˜0.4 mm; 2) hydrogen decrepitation: putting the quenched alloy and a plurality of rigid balls into a rotatable hydrogen decrepitation container simultaneously, rotating the container, the quenched alloy is crushed under a hydrogen pressure between 0.01˜1 MPa, then screening the mixture to remove the rigid balls and obtain the powder.