Material for a permanent magnet

Details Material for a permanent magnet Material for a permanent magnet

1994-10-05

1995-09-26

Sheehan, John

Metal treatment

Stock

Magnetic

148311, 428403, H01F 106

Patent

active

054531373

ABSTRACT:
The material for permanent magnet according to the present invention comprises an acicular iron powder having successively on the surface (1) a coated layer of aluminum phosphate, (2) a diffused layer of rare earth element or a diffused layer of rare earth element.boron or a diffused layer of rare earth element.boron.nitrogen, and (3) a coated layer of aluminum phosphate. The material for permanent magnet can be produced by (a) a step of mixing and covering an acicular goethite (FeOOH) crystal with aluminum phosphate, (b) a step of preparing an acicular iron powder coated with a layer of aluminum phosphate by reducing under hydrogen atmosphere at 300.degree.-500.degree. C. the acicular goethite (FeOOH) crystal covered by the aluminum phosphate, (c) a step of diffusing a rare earth element or a rare earth element and boron into the surface layer of aluminum phosphate by heating under argon atmosphere at 650.degree.-1000.degree. C. the acicular iron powder coated with a layer of aluminum phosphate in the presence of the rare earth element or the rare earth element and boron, (d) a step of mixing and covering the rare earth element diffused powder or rare earth element and boron diffused powder with aluminum phosphate, and (e) a step of coating the rare earth element diffused powder or rare earth element and boron diffused powder with aluminum phosphate by heating under argon atmosphere at 300.degree.-500.degree. C. the rare earth element diffused powder or rare earth element and boron diffused powder covered by the aluminum phosphate.

REFERENCES:
patent: 4082905 (1978-04-01), Stephan et al.
patent: 4804561 (1989-02-01), Tanioka et al.
patent: 4863805 (1989-09-01), Suzuki et al.
patent: 4942098 (1990-07-01), Hamamura et al.
patent: 4970124 (1990-11-01), Oltean et al.
patent: 5225281 (1993-07-01), Tamai et al.
Teitaro Hiraga et al., "Ferrite", Maruzen 1988, p. 45 (translation attached).

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