STABILIZATION OF FERROMAGNETIC METAL POWDER

PURPOSE:To obtain highly stable ferromagnetic metal powder by depositing an organic metal compound on the particle surfaces of ferromagnetic metal powder and thereafter conducting heat treatment in an inactive gas atmosphere, in hydrogen gas, or in a reducing gas atmosphere mainly composed of hydrog...

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Bibliographische Detailangaben
Hauptverfasser:	HIRAMATSU MASANOBU, TAGAWA KIMITERU
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 obtain highly stable ferromagnetic metal powder by depositing an organic metal compound on the particle surfaces of ferromagnetic metal powder and thereafter conducting heat treatment in an inactive gas atmosphere, in hydrogen gas, or in a reducing gas atmosphere mainly composed of hydrogen. CONSTITUTION:As an organic metal compound, it is preferable to contain a metal to form a metal oxide having high stability of oxidation by thermal decomposition. As the metal explained above, Al, Si, B, Ti, Zn and Zr can be used. In addition, a compound, for example, metal alkoxide compound and metal chelate compound which easily dissolves into ordinary organic solvent not easily combining with ferrometal particles, such as toluene, heptane is preferable. As a method of depositing organic metal compound to the ferromagnetic metal particle surface, after the metal particles are immersed into the solution obtained by dissolving organic metal compound into a solvent, the solvent is eliminated and organic metal compound is deposited on the particles.