MANUFACTURE OF IMPROVED FERROMAGNETIC METAL POWDER

PURPOSE:To make it possible to prevent mechanical breakage with needle fracture of ferromagnetic metal powder by a method wherein metal compound grain is dipped into a solution containing an aluminum compound in a specific steeple device. CONSTITUTION:The metal compound grain mainly composed of iron...

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Bibliographische Detailangaben
Hauptverfasser:	MORITA KIYOTAKE, KATO HIROSHI, HIRAMATSU MASANOBU
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 make it possible to prevent mechanical breakage with needle fracture of ferromagnetic metal powder by a method wherein metal compound grain is dipped into a solution containing an aluminum compound in a specific steeple device. CONSTITUTION:The metal compound grain mainly composed of iron or ferrous compound is reduced by heating in a reducing atmosphere, and the ferromagnetic metal powder mainly composed of iron or a ferrous compound is obtained. An aluminum compound is coated on the surface of the metal compound grain by dipping the metal compound grains into the solution containing an aluminum compound before a reducing operation is conducted. A steeple type device, having the diameter D and height H0 of the ratio in the range of 0.5-50, is used and the aluminum compound is coated while the solution is being mixed by circulating gas from the bottom part of the device. As a result, the mechanical breakage with needle fracture of ferromagnetic metal powder can be prevented.