Hexagonal-system ferrite powder, composite plastic-ferrite magne

Details Hexagonal-system ferrite powder, composite plastic-ferrite magne Hexagonal-system ferrite powder, composite plastic-ferrite magne

1978-02-15

1978-10-17

Edmundson, F.C.

Compositions

Magnetic

With wax, bitumen, resin, or gum

252 6262, 252 6263, C04B 3526, H01F 1117

Patent

active

041208064

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: 3184807 (1965-05-01), Schornstheimer et al.
patent: 3371044 (1968-02-01), Cochardt
patent: 3428603 (1969-02-01), Kroenke
patent: 3634254 (1972-01-01), Micheli
patent: 3764539 (1973-10-01), Cochardt et al.
patent: 3855374 (1974-12-01), Brailowsky et al.
patent: 3928709 (1975-12-01), Audran et al.
patent: 4042516 (1977-08-01), Matsumoto et al.

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