Rare earth-based permanent magnet

Details Rare earth-based permanent magnet Rare earth-based permanent magnet

1990-07-16

1991-07-23

Howard, Jacqueline V.

Compositions

Magnetic

Iron-oxygen compound containing

252 6258, 75244, 75347, 148101, 148302, 420 83, 420416, 420440, C 2C 2800, H01F 108

Patent

active

050341464

ABSTRACT:
The magnetic properties or, in particular, coercive force of a sintered permanent magnet composed of a light rare earth element, boron and iron can be greatly improved without affecting the residual magnetic flux by the admixture of a relatively small amount of additive elements including heavy rare earth elements, aluminum, titanium, vanadium, niobium and molybdenum. In the inventive magnets, the distribution of the additive element is not uniform but localized in the vicinity of the grain boundaries of the matrix particles. Such a localized distribution of the additive elements is obtain by sintering a powder mixture composed of a powder of an alloy of the base ingredients and a powder containing the additive element or elements.

REFERENCES:
patent: 4681623 (1987-07-01), Okajima
patent: 4684406 (1987-08-01), Matsuura

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