Method for producing composite soft magnetic material having high strength and high specific resistance

• Main Author: MIYAHARA MASAHISA,MORIMOTO KOICHIRO
• Format: Patent
• Language: English
• Published: 06.12.2006
• 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

A method for producing a composite soft magnetic material having a high strength and a high specific resistance, which comprises providing a raw material mixture powder having a compounding composition comprising 0.05 to 1 mass % of a polyimide resin powder having an average particle diameter of 1 to 100 mum, 0.002 to 0.1 mass % of a fine amide-based wax powder having an average particle diameter of 1 to 20 mum and the balanced amount of a soft magnetic powder coated with an insulating coating film having a soft magnetic powder and, formed on the surface thereof, an insulating coating film, heating the raw material mixture powder to a temperature of 60 to 110 DEG C, filling a mold heated to a temperature of 100 to150 DEG C with the heated raw material mixture powder, subjecting the raw material mixture powder to a green powder molding under a molding pressure of 700 to 1200 MPa, and firing the resulting molded article at a temperature of 225 to 300 DEG C.