METHOD FOR THE PREPARATION OF ACICULAR FERROMAGNETIC IRON PARTICLES

1. A process for the manufacture of acicular ferromagnetic iron particles of acicular iron(III) oxide hydroxyde which consists of lepidocrodite and, optionally, goethite and is provided with a shape-stabilizing surface coating by reduction with hydrogen at 275 degrees to 420 degrees C, wherein the a...

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Bibliographische Detailangaben
Hauptverfasser:	STECK, WERNER, HUEBNER, WERNER, AUTZEN, HORST, VAETH, GUENTER, RUDOLF, PETER, SCHAEFER, DIETER, JAKUSCH, HELMUT
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ADHESIVES BASIC ELECTRIC ELEMENTS CASTING CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CORRECTING FLUIDS DYES ELECTRICITY FILLING PASTES INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS INORGANIC CHEMISTRY 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:	1. A process for the manufacture of acicular ferromagnetic iron particles of acicular iron(III) oxide hydroxyde which consists of lepidocrodite and, optionally, goethite and is provided with a shape-stabilizing surface coating by reduction with hydrogen at 275 degrees to 420 degrees C, wherein the acicular iron(III) oxide hydroxide contains 15 to 100 percent by weight of lepidocrocite and 0 to 85 percent by weight of goethite and, after the application of the shape-stabilizing surface coating known per se and before reduction, is dehydrated and heat-treated for 0.5 to 8 hours at temperatures between 400 degrees and 750 degrees C.