Magnetic powder and production process thereof

Details Magnetic powder and production process thereof Magnetic powder and production process thereof

1985-06-20

1987-05-26

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

148105, 427127, 75251, 428403, C22C 104

Patent

active

046682830

ABSTRACT:
Magnetic powder protected from subsequent oxidation and deterioration can be obtained by effecting contact of starting magnetic powder, which is formed of an intermetallic compound containing a rare-earth metal and an iron-group metal as principal components thereof, with a phosphorus compound containing at least one active proton having a pKa of 4 or smaller and exposure of the starting magnetic powder to an oxygen-containing atmosphere in an arbitrary order or simultaneously. Production of a plastic magnet with the magnetic powder of this invention allows to avoid danger and deterioration in magnetic characteristics of the resulting product due to oxidation of the magnetic powder even if exposed to elevated temperatures during its production or use.

REFERENCES:
patent: 2232352 (1941-02-01), Verweij et al.
patent: 2306198 (1942-12-01), Verweij et al.
patent: 3558371 (1971-01-01), Becker
patent: 4155748 (1979-05-01), Steck et al.
patent: 4169802 (1979-10-01), Basile et al.
patent: 4501795 (1985-02-01), Takeuchi et al.

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