PRODUCTION OF MAGNETIC METAL POWDER FOR MAGNETIC RECORDING

PURPOSE:To prevent the deformation and melt sticking of particles and to improve the aging stability by adhering Si or Al hydroxide to optionally modified acicular iron oxide having a prescribed compsn. before reduction. CONSTITUTION:Acicular iron oxide or modified acicular iron oxide contg. Ni, Co,...

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Bibliographische Detailangaben
Hauptverfasser:	MATSUMOTO SHOKI, CHIKAMORI YOJI, INOUE YOSHIHIRO, TANABE YUKIMASA
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES BASIC ELECTRIC ELEMENTS CASTING CHEMICAL PAINT OR INK REMOVERS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CORRECTING FLUIDS DIFFUSION TREATMENT OF METALLIC MATERIAL DYES ELECTRICITY FILLING PASTES INDUCTANCES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL 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 SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSFORMERS TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent the deformation and melt sticking of particles and to improve the aging stability by adhering Si or Al hydroxide to optionally modified acicular iron oxide having a prescribed compsn. before reduction. CONSTITUTION:Acicular iron oxide or modified acicular iron oxide contg. Ni, Co, Zn or Mn is used as starting material. This starting material is brought into contact with a colloidal soln. of Si or Al hydroxide to adhere the Si or Al hydroxide to the surface of the starting material and magnetic metal powder for magnetic recording is obtd. by reducing the starting material. When the magnetic metal powder is stabilized, the surface of the powder is subjected to preliminary oxidation treatment by heating to 200-400 deg.C in an H2-CO2 atmosphere and the partial pressure of oxygen in the atmosphere is slowly increased at room temp. to oxidize and stabilize the surface of the powder.