POWDER FOR MAGNETIC CORE, POWDER MAGNETIC CORE, AND THEIR PRODUCTION METHODS

• Main Authors: ICHIGOZAKI DAISUKE, HOSHINA EISUKE, KISHIMOTO HIDEFUMI, TAJIMA SHIN, TANI MASAAKI, OKAMOTO DAISUKE
• Format: Patent
• Language: English; Korean
• Published: 30.06.2010
• Subjects: BASIC ELECTRIC ELEMENTS; CASTING; ELECTRICITY; INDUCTANCES; MAGNETS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; WORKING METALLIC POWDER

Disclosed is a method for producing a powder for a magnetic core, which is characterized by carrying out an alkoxide film formation step and a silicone resin film formation step to form an insulation film composed of an alkoxide film and a silicone resin film on the surface of a pure iron powder; wherein the alkoxide film formation step comprises immersing a pure iron powder in an alkoxide-containing solution which is prepared by mixing a Si alkoxide having an organic group with a polar group containing at least one atom selected from N, P, S and O atoms and an Al alkoxide with a dehydrated organic solvent, and drying the immersion product to remove the dehydrated organic solvent, thereby forming an alkoxide film comprising an Al-Si-O-type composite oxide on the surface of the pure iron powder; and the silicone resin film formation step comprises immersing the pure iron powder having the alkoxide film formed thereon in a silicone resin-containing solution which is prepared by mixing a silicone resin with an organic solvent, and drying the immersion product to remove the organic solvent, thereby forming a silicone resin film on the alkoxide film.