Method for forming in situ magnetic media in the form of discret

Details Method for forming in situ magnetic media in the form of discret Method for forming in situ magnetic media in the form of discret

1980-04-23

1981-11-10

Pianalto, Bernard D.

Stock material or miscellaneous articles

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Of metal

427 35, 427 36, 427 48, 427 55, 427128, 427129, 427132, 427261, 428694, 428900, B32B 1504

Patent

active

042998883

ABSTRACT:
A method of forming discrete magnetic particles in situ by dispersing a nickel hypophosphite solution in a binder and binder solvent, such as polyvinyl alcohol in water or polyester urethane polymer in an organic solvent, forming a coating from the nickel hypophosphite binder solution on a substrate, and exposing the coating to a radiant energy source, such as x-rays or an electron beam. Thereafter the incipient magnetic media in the area exposed to radiation is developed by contact with a solution including ions of at least one of cobalt, nickel and iron and a reducing agent, such as a hypophosphite ion, to produce a magnetic media of discrete magnetic particles within the binder in the area exposed to the radiant energy while not forming such magnetic particles in other unexposed areas of the nickel hypophosphite coating.

REFERENCES:
patent: 3772078 (1973-11-01), Polichette
patent: 4059463 (1977-11-01), Aonuma et al.
NASA Tech. Brief, 12-72, B 72-10456 Radiation Induced Nickel Deposits.

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