Process for producing hexagonal-system ferrite powder

Details Process for producing hexagonal-system ferrite powder Process for producing hexagonal-system ferrite powder

1977-08-22

1978-10-17

Edmundson, F.C.

Compositions

Magnetic

Iron-oxygen compound containing

252 6254, 252 6263, H01F 1117

Patent

active

041208072

ABSTRACT:
A novel hexagonal-system ferrite powder having surprisingly high coercive force as well as other excellent performance characteristics is disclosed. The ferrite powder is prepared by co-precipitating ferrous hydroxide and a metal carbonate in a liquid phase under specified conditions, followed by calcinating the resulting co-precipitated product under specified temperature conditions. The ferrite powder thus obtained has a good miscibility with a plastic material and is suitable for making a composite plastic-ferrite magnet.

REFERENCES:
patent: 3634254 (1972-01-01), Micheli
patent: 3928709 (1975-12-01), Audran et al.
patent: 4042516 (1977-08-01), Matsumoto et al.

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