Techniques for preparing magnetic particles having utility in re

Details Techniques for preparing magnetic particles having utility in re Techniques for preparing magnetic particles having utility in re

1986-12-29

1987-10-06

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25F 500

Patent

active

046981403

ABSTRACT:
The present invention relates to techniques for producing magnetic particles for use in recording media. The process of the present invention generally comprises providing an alloy capable of forming a magnetic precipitate, aging the alloy to form a magnetic precipitate comprising a plurality of magnetic particles dispersed throughout a surrounding matrix; and dissolving the matrix to leave the magnetic particles. The dissolution of the matrix is done electrochemically using a pyrophosphate solution.

REFERENCES:
patent: 4257830 (1981-03-01), Tsuya et al.
patent: 4274865 (1981-06-01), Suzuki et al.
patent: 4290799 (1981-09-01), Schroeder et al.
patent: 4461685 (1984-07-01), Pryor

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