Rare earth permanent magnet and production method thereof

Details Rare earth permanent magnet and production method thereof Rare earth permanent magnet and production method thereof

1998-12-11

2000-12-12

Mai, Ngoclan

Metal treatment

Stock

Magnetic

148103, 419 30, 419 32, 419 40, 252 625, H01F 100

Patent

active

061593087

ABSTRACT:
A method of producing an R--Fe--B-based, sintered permanent magnet, wherein R is at least one rare earth element including Y, having a small oxygen content. A coarse alloy powder prepared by a reductive diffusion method is milled and recovered into a solvent to form a slurry. The slurry is wet-compacted to form a green body which is then sintered after removing the solvent. The milling, recovering, wet-compacting, solvent-removing and sintering steps are carried out while preventing the powder, slurry and green body from being brought into contact with air to minimize the oxygen content in the final sintered permanent magnet. The sintered permanent magnet produced has a high density and a high magnetic properties due to a low oxygen content.

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