| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method by which a powder magnetic core with high specific resistance and a high magnetic flux density can be obtained.SOLUTION: The manufacturing method of the powder magnetic core includes: a molding step for pressure-molding a magnetic core powder in which a surface of a soft magnetic particle formed from a pure iron or an iron alloy containing Fe in 90 mass% or more is formed from an ion-oxide particle of a metal element (M) that is one or more of Mn, Zn, Ni, Cu and Mg and a coated partial that is coated by the iron-oxide particle; and a heat treatment step for heating a mold that is obtained after the molding step, at 370 to 600°C. Thus, the powder magnetic core can be obtained in which a spinel-type ferrite (MFeO) is generated between the soft magnetic particles. It is preferable that the magnetic core powder relating to the present invention is obtained via a granulation step for stirring and mixing a soft magnetic powder formed from soft magnetic particles, an oxide powder formed from oxide particles and an iron-oxide powder formed from iron-oxide particles under strong energy satisfying collision energy 1 to 5 J/s g.SELECTED DRAWING: Figure 1 |
