SOFT MAGNETIC MATERIAL, DUST CORE AND METHOD FOR PRODUCING SOFT MAGNETIC MATERIAL

• Main Authors: TOYODA, HARUHISA, ISHITANI, SEIJI, IGARASHI, NAOTO, MAEDA, TORU, HAYASHI, KAZUYUKI, KUGAI, HIROKAZU, MORII, HIROKO
• Format: Patent
• Language: English; French; Japanese
• Published: 06.04.2006
• 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

Disclosed is a soft magnetic material containing a composite magnetic particle (30) composed of a metal magnetic particle (10) mainly containing Fe and an insulating coating film (20) covering the metal magnetic particle (10). The insulating coating film (20) contains an iron phosphate compound and an aluminum phosphate compound. The atomic ratio of Fe contained in a surface of the insulating coating film (20) which is in contact with the metal magnetic particle (10) is larger than the atomic ratio of Fe contained in the outer surface of the insulating coating film (20). The atomic ratio of Al contained in the surface of the insulating coating film (20) which is in contact with the metal magnetic particle (10) is smaller than the atomic ratio of Al contained in the outer surface of the insulating coating film (20). With such a constitution, iron loss can be reduced. L'invention concerne un matériau magnétique souple contenant une particule magnétique composite (30) composée d'une particule magnétique métallique (10) contenant principalement du Fe et un film de revêtement isolant (20) recouvrant la particule magnétique métallique (10). Le film de revêtement isolant (20) contient un composé de phosphate de fer et un composé de phosphate d'aluminium. Le rapport atomique du Fe contenu dans une surface du film de revêtement isolant (20) qui est au contact de la particule magnétique métallique (10) est plus grand que le rapport atomique de Fe contenu dans la surface externe du film de revêtement isolant (20). Le rapport atomique de l'Al contenu dans la surface du film de revêtement isolant (20) qui est au contact de la particule magnétique métallique (10) est plus petit que le rapport atomique de l'Al contenu dans la surface externe du film de revêtement isolant (20). Une telle constitution permet de réduire la perte de fer.