Process of producing magnetic recording media

Details Process of producing magnetic recording media Process of producing magnetic recording media

1984-06-08

1985-10-22

Metz, Andrew H.

Chemistry: electrical and wave energy

Processes and products

204 376, 204 42, C25D 1120

Patent

active

045486824

ABSTRACT:
A magnetic recording medium having excellent magnetic properties and a uniform recording envelope suitable for, in particular, high-density recording is obtained by packing a magnetic substance in the micro pores of anodic oxide film formed on an aluminum substrate by subjecting the same to an anodic oxidation treatment to produce an anodic oxide film having a thickness of at least 4 .mu.m. The recording medium can be improved by immersing the anodized aluminum substrate in an acid or alkali bath to chemically dissolve a part of the anodic oxide film, and thereby enlarge the micro pores in the anodic oxide film to a pore diameter in the range of 300 .ANG. to 1,400 .ANG., optionally applying an electric current to the aluminum substrate in the immersion bath if necessary to control the thickness of the barrier layer in the anodic oxide film, before subjecting the treated substrate to an electrolytic treatment in a bath containing ions of a magnetic substance to deposit the magnetic substance in the enlarged micro pores. Thereafter, the surface of the anodic oxide film, and any excess deposited magnetic material thereon, is physically ground to expose the packed magnetic substance at the surface of the film.

REFERENCES:
patent: 4109287 (1978-08-01), Kawai et al.
patent: 4310586 (1982-01-01), Sheasby et al.
patent: 4390562 (1983-06-01), Yanagisawa
patent: 4414271 (1983-11-01), Kitamoto et al.

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