FERROMAGNETIC METALLIC POWDER TREATED WITH CARBON DIOXIDE

PURPOSE:To produce pulverized ferromagnetic iron powder which has an oxide layer on the surface and is suitable for a magnetic recording medium by subjecting the ferromagnetic iron powder which contains a sintering preventive component and is reduced by a reducing gas to a CO2 treatment under specif...

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Bibliographische Detailangaben
Hauptverfasser:	HIRAMATSU MASANOBU, TAGAWA KIMITERU
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BASIC ELECTRIC ELEMENTS CASTING CHEMISTRY ELECTRICITY FERROUS OR NON-FERROUS ALLOYS INDUCTANCES MAGNETS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY PERFORMING OPERATIONS POWDER METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	PURPOSE:To produce pulverized ferromagnetic iron powder which has an oxide layer on the surface and is suitable for a magnetic recording medium by subjecting the ferromagnetic iron powder which contains a sintering preventive component and is reduced by a reducing gas to a CO2 treatment under specific conditions. CONSTITUTION:The ferromagnetic metallic powder such as iron powder which contains any of Al, P, Si and B as the sintering preventive component at a weight ratio with Fe of 0.1/100-5/100 in all of Al/Fe, P/Fe, Si/Fe, and B/Fe and consists essentially of iron oxyhydroxide or iron oxide is subjected to the reducing treatment with the gaseous phase contact reduction reaction by gaseous hydrogen. Such iron powder is brought into reaction with the high-purity gaseous CO2 at a ratio of 0.01-5wt% said gas per 1g of the iron powder at