Method for preparing barium-ferrite-coated .gamma.FE.sub.2 O.sub

Details Method for preparing barium-ferrite-coated .gamma.FE.sub.2 O.sub Method for preparing barium-ferrite-coated .gamma.FE.sub.2 O.sub

1993-06-11

1994-11-22

Beck, Shrive

Coating processes

Magnetic base or coating

427215, 4273722, 427379, 427380, 148105, 75349, 75350, B05D 512

Patent

active

053667611

ABSTRACT:
A method for preparing a barium-ferrite-coated, needle-shaped .gamma.-Fe.sub.2 O.sub.3 magnetic powder of better properties is provided. The method includes the following steps of a) letting an iron-containing solution undergo a reaction to precipitate a needle-shaped .alpha.-FeOOH phase powder, b) mixing said .alpha.-FeOOH powder into a barium-containing solution in a predetermined Fe/Ba ratio, c) filtering without washing the precipitated powder, and d) subjecting the precipitated powder to heat treatments including calcination, reduction and oxidation.

REFERENCES:
patent: 4050962 (1977-09-01), Koester et al.
patent: 4178171 (1979-12-01), Steck et al.
patent: 4305753 (1981-12-01), French
M. P. Sharrock, "Particulate Recording Media", in: MRS Bulletin, vol. XV, Mar. 1990 pp. 53-61.
M. P. Sharrock, "Particulate Magnetic Recording Media: A Review", in: IEEE Trans. Magn. MAG-23, No. 1, pp. 4374-4389, Nov. 1989.
A. Eiling, "Co-Modified Pigments In Magnetic Recording", in: IEEE Trans. Magn. MAG-25, pp. 16-21, no date available.

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