Process for manufacturing powder for magnetic recording medium

Details Process for manufacturing powder for magnetic recording medium Process for manufacturing powder for magnetic recording medium

1981-09-22

1983-10-04

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6263, 423594, C04B 3526, C01G 4900

Patent

active

044077211

ABSTRACT:
A process for manufacturing a hexagonal ferrite magnetic powder for a magnetic recording medium involves rapidly cooling a molten material of a glass-forming component and a hexagonal ferrite-forming component to obtain glass flakes, heating the glass flakes to precipitate ferrite fine grains, incompletely dissolving the glass flakes with an acid or boiling water, and separating and recovering the fine grains in the presence of a dispersing agent.

REFERENCES:
patent: 3549315 (1970-12-01), Lester et al.
patent: 3716630 (1973-02-01), Shirk
patent: 4233169 (1980-11-01), Beall
patent: 4278556 (1981-07-01), Tada
patent: 4341648 (1982-07-01), Kubo et al.

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