Process for manufacturing permanent magnet

Details Process for manufacturing permanent magnet Process for manufacturing permanent magnet

1985-10-04

1989-12-19

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148102, 148103, 419 12, 419 29, 419 38, 419 54, H01F 102

Patent

active

048880680

ABSTRACT:
A process for manufacturing a rare earth-iron-boron alloy permanent magnet by, after sintering, keeping the sintered alloy at temperatures of 750.degree.-1000.degree. C. for 0.2-5 hours, slowly cooling it at a cooling rate of 0.3.degree.-5.degree. C./min. to temperatures between room temperature and 600.degree. C.; annealing it at temperatures of 550.degree.-700.degree. C. for 0.2-3 hours, and rapidly cooling it at a cooling rate of 20.degree.-400.degree. C./min. The permanent magnet contains a matrix, a B-rich phase and a Nd-rich phase. In grain boundaries of the matrix phases covered by bcc phases, thin, fine plates of the bcc phases projecting into the matrix phases are once increased by the first heat treatment and slow cooling and then eliminated by the annealing.

REFERENCES:
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 4601875 (1986-07-01), Yamamoto et al.

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