FORMING CURVED THIN MAGNETS FROM RARE EARTH- TRANSITION METAL POWDERS

摘要

C-2,820 D-1,744 FORMING CURVED THIN MAGNETS FROM RARE EARTH-TRANSITION METAL POWDERS In a preferred embodiment, thin curved rare earthtransition metal (RE-TM) compacts with good green strength are made by a stepwise process in the molding cavities of a portable compacting tooling. The powder is partially compacted and magnetically aligned in a first press equipped with magnetizing means. It is then transported in the tooling, which protects the powder from being disturbed during the transportation, to a second press where it is further compacted under much higher loads. The compacts thus formed can be further processed to form thin, curved, densified, permanent rare earth-cobalt magnets particularly suited for use as pole pieces in small, high-torque D.C. motors.