Bonded permanent magnet

Details Bonded permanent magnet Bonded permanent magnet

1995-06-02

1996-10-29

Sheehan, John

Metal treatment

Stock

Magnetic

252 6254, 75230, 75244, 75246, H01F 1057

Patent

active

055693369

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.multidot.boron or a diffused layer of rare earth element.multidot.boron.multidot.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).

Affiliated with

Also associated with

Rating

Bonded permanent magnet does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Bonded permanent magnet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bonded permanent magnet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1783535