POWDER FOR MAGNETIC CORE, POWDER-COMPACTED MAGNETIC CORE, AND THEIR PRODUCTION METHOD

PROBLEM TO BE SOLVED: To provide a powder-compacted magnetic core having high magnetic flux density and low loss. SOLUTION: The powder-compacted magnetic core is obtained by compacting powder for a magnetic core composed of magnetic powder essentially consisting of Fe and Si and an insulated film fo...

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Hauptverfasser:	CHOU KOKUHOU, SUGIYAMA MASAKI, HIGASHIYAMA KIYOSHI, KIKKO TADAYOSHI, KONDO MIKIO, HATTORI TAKESHI, TAJIMA SHIN, KISHIMOTO HIDESHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BASIC ELECTRIC ELEMENTS CASTING CHEMISTRY ELECTRICITY FERROUS OR NON-FERROUS ALLOYS INDUCTANCES MAGNETS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY PERFORMING OPERATIONS POWDER METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING METALLIC POWDER
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a powder-compacted magnetic core having high magnetic flux density and low loss. SOLUTION: The powder-compacted magnetic core is obtained by compacting powder for a magnetic core composed of magnetic powder essentially consisting of Fe and Si and an insulated film formed on the surfaces of the particles of the magnetic powder. The insulated film is obtained by subjecting the magnetic powder to external oxidation treatment. The specific oxygen content (g/m2) denoting the oxygen content (g) per unit surface area (m2) of the magnetic powder is 0.005 to 0.05 g/m2. Since the insulated film is thin and has excellent heat resistance, at the time when the magnetic powder coated with the insulated film is used, the powder-compacted magnetic core having high magnetic flux density and low hysteresis loss can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI