METALLIC POWDER FOR POWDER MAGNETIC CORE, AND METHOD FOR MANUFACTURING POWDER MAGNETIC CORE

摘要

PROBLEM TO BE SOLVED: To provide a metallic powder for a powder magnetic core which has an enhanced bonding strength between an insulation material and particles and has superior electrical insulation properties, by uniformly concentrating Si only on the surface layer of a powder without causing a deterioration of compressibility or a decrease of a saturation magnetic flux density. SOLUTION: This manufacturing method comprises the steps of: heating a metallic powder which presents an austenite phase in a high-temperature range, to a temperature range in which the austenite phase is formed; and concentrating Si on the surface layer of the metallic powder by a gas phase reaction in the temperature range. COPYRIGHT: (C)2007,JPO&INPIT