FINE MAGNETIC METALLIC POWDER HAVING SMALL SPECIFIC SURFACE AREA AND ITS MANUFACTURE

PURPOSE:To manufacture magnetic metallic powder having a small specific surface area by reducing spindle-shaped goethite having a specified major axis size, a specified minor axis size and a specified axial ratio with a reducing gas. CONSTITUTION:Spindle-shaped goethite having 0.05-0.3mum major axis...

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Bibliographische Detailangaben
Hauptverfasser:	MIYAHARA TETSUSHIYUU, KAWAKAMI KATSUHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES BASIC ELECTRIC ELEMENTS CASTING CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES ELECTRICITY FILLING PASTES INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS MAGNETS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS PHYSICS POLISHES POWDER METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	PURPOSE:To manufacture magnetic metallic powder having a small specific surface area by reducing spindle-shaped goethite having a specified major axis size, a specified minor axis size and a specified axial ratio with a reducing gas. CONSTITUTION:Spindle-shaped goethite having 0.05-0.3mum major axis size, 0.015-0.04mum minor axis size and 3-15 axial ratio is optionally dehydrated by heat treatment to prepare iron oxide, and the goethite or the iron oxide is reduced with a reducing gas at about 300-500 deg.C. The starting material is coated with a sintering inhibitor such as potassium silicate before the reduction. The amount of the inhibitor is about 5-10wt% of the amount of the goethite. Magnetic metallic powder having 0.05-0.2mum major axis size, 4-10 axial ratio and 30-55m /g specific surface area is obtd. The specific surface area is measured by adsorbing gaseous N2 by the BET method.