Acicular .alpha.-iron particles, their preparation and recording

Details Acicular .alpha.-iron particles, their preparation and recording Acicular .alpha.-iron particles, their preparation and recording

1979-03-19

1980-06-10

Pianalto, Bernard D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75251, 252 6254, 427128, 427132, 428900, H01F 1002, C22C 104

Patent

active

042070929

ABSTRACT:
Particulate product containing at least 75 weight % iron (total iron content) and at least 25 weight % acicular .alpha.-iron metal, process for making said product and magnetic recording medium having said product incorporated therein, said product having a length less than 1 micron (.mu.), a length to diameter ratio of at least about 10:1, a coercivity (iH.sub.c), of greater than about 800 oersteds, a saturation magnetization (.sigma..sub.s) of at least 110 electromagnetic units/gram (emu/g), a residual (remanent) magnetization (.sigma..sub.r) of at least 50 emu/g, and a ratio (.sigma..sub.r /.sigma..sub.s) of residual (remanent) magnetization (.sigma..sub.r) to saturation magnetization of at least about 0.45.

REFERENCES:
patent: 2879154 (1959-03-01), Campbell
patent: 3607219 (1971-09-01), Van Der Giessen et al.
patent: 3865627 (1975-02-01), Roden et al.
patent: 3975186 (1976-08-01), Grebe et al.
patent: 4017303 (1977-04-01), Koester et al.
patent: 4050962 (1977-09-01), Koester et al.

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