Ferromagnetic metal pigment essentially consisting of iron...

Details Ferromagnetic metal pigment essentially consisting of iron... Ferromagnetic metal pigment essentially consisting of iron...

C - Chemistry, Metallurgy

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C22C 1/00 (2006.01) B22F 9/24 (2006.01) C22C 38/00 (2006.01) G11B 5/706 (2006.01) H01F 1/06 (2006.01)

Patent

CA 1150534

A FERROMAGNETIC METAL PIGMENT ESSENTIALLY CONSISTING OF IRON AND A PROCESS FOR ITS PRODUCTION Abstract of the Disclosure A metal powder, suitable for magnetic recording, consisting essentially of iron, the individual particles being acicular and containing on average no more than 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 to 600°C. Le A 19 359

347017

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