| abstract |
(57) [Problem] To provide a dust core made of Fe-Si-based magnetic powder having higher density than before. A powder magnetic core according to the present invention is a powder magnetic core obtained by press-molding a magnetic powder containing Fe and Si as a main component and covered with an insulating film. X: mass%) and a density ratio (ρ) which is a ratio of a bulk density (ρ) of the dust core to a true density (ρ 0 ) of the magnetic powder. / Ρ 0 :%) and ρ / ρ 0 ≧ 94-X (%). A powder magnetic core having a high density according to the Si content is industrially manufactured by, for example, a mold lubrication warm pressing method. |