METHOD FOR MANUFACTURING SOFT MAGNETIC POWDER, METHOD FOR MANUFACTURING SOFT MAGNETIC MATERIAL, METHOD FOR MANUFACTURING POWDER MAGNETIC CORE, SOFT MAGNETIC POWDER, SOFT MAGNETIC MATERIAL AND POWDER MAGNETIC CORE

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a soft magnetic powder which can effectively reduce a hysteresis loss; a method for manufacturing a soft magnetic material; a method for manufacturing a powder magnetic core; a soft magnetic powder; a soft magnetic material; and a powder magnetic core. SOLUTION: The method for manufacturing the soft magnetic powder comprises: firstly a preparation step of preparing iron-based particles containing 98 mass% or more iron and the balance unavoidable impurities; a first heat treatment step of heat-treating the iron-based particles at 1,000°C to 1,400°C in an atmosphere in which manganese is more stable than oxides of manganese; and subsequently to the first heat treatment step, a second heat treatment step of heat-treating the iron-based particles in an atmosphere which is in a temperature of 700°C to 1,000°C, and contains at least one element selected from the group consisting of an element that has an absolute value of free energy of producing a compound of manganese higher than that of free energy of producing a compound of iron, and a compound of the element and iron, and in which the compound of manganese and the element is more stable than manganese contained in the iron-based particles. COPYRIGHT: (C)2008,JPO&INPIT