Ferromagnetic metal pigment essentially consisting of iron and a

Details Ferromagnetic metal pigment essentially consisting of iron and a Ferromagnetic metal pigment essentially consisting of iron and a

1980-02-25

1981-09-22

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75251, B22F 100

Patent

active

042907993

ABSTRACT:
A metal powder, suitable for magnetic recording, consisting essentially of iron, the individual particles being acicular and containing on average no more then 5 pores and consisting on average of no more than 2 metal cores is produced by precipitating and oxidizing an aqueous iron-(II)-salt solution to produce finely divided acicular iron-(III)-oxide-hydroxide, stabilizing it as by treatment with cadmium, lead, calcium, magnesium, zinc, aluminum, chromium, tungsten, a phosphorus oxide and/or a boron oxide, converting it into ferromagnetic iron oxide of low pore content, and reducing it to metallic iron with a gaseous reducing agent at about 300.degree. to 600.degree. C.

REFERENCES:
patent: 3837839 (1974-09-01), Rau
patent: 3910785 (1975-10-01), Greene
patent: 4133676 (1979-01-01), Oshimura
patent: 4133677 (1979-01-01), Matsui
patent: 4165232 (1979-08-01), Jaeckh

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