Production of a magnetic powder having a high dispersibility

Details Production of a magnetic powder having a high dispersibility Production of a magnetic powder having a high dispersibility

1983-03-08

1985-01-15

Cooper, Jack

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

252 6258, 252 6259, 252 6263, 423594, 427127, 428406, 428692, 428694, 428702, 428900, C04B 3526

Patent

active

044938748

ABSTRACT:
A hexagonal ferrite magnetic powder for high density magnetic recording, having an improved dispersibility in a binder or paint is obtained by melting a mixture of hexagonal ferrite-forming components and a glass-forming component, and rapidly cooling the resultant molten mixture to obtain an amorphous material. The amorphous material is thermally treated to precipitate fine particles of the hexagonal ferrite therein. The amorphous material containing the precipitated fine particles is dissolved such that the glass-forming component remains on each of said fine particles in an amount of 0.01 to 0.3% by weight based on the weight of the particles.

REFERENCES:
patent: 3716630 (1973-02-01), Shirk
patent: 4124735 (1978-11-01), O'Horo
patent: 4140645 (1979-02-01), Beall et al.
patent: 4233169 (1980-11-01), Beall et al.
patent: 4341648 (1982-07-01), Kubo et al.
patent: 4407721 (1983-10-01), Koike et al.
B. T. Shirk, W. R. Buessem, "Magnetic Properties of Barium Ferrite Formed by Crystallization of a Glass".

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