POWDER-COMPACT MAGNETIC CORE, AND METHOD FOR MANUFACTURING POWDER-COMPACT MAGNETIC CORE

摘要

PROBLEM TO BE SOLVED: To provide: a powder-compact magnetic core including soft magnetic particles made of an Fe-Si based alloy, and having a high density and a low coercive force; and a method for manufacturing such a powder-compact magnetic core.SOLUTION: A powder-compact magnetic core comprises: a plurality of soft magnetic particles; and an insulator coating covering the surface of each soft magnetic particle. The soft magnetic particles are Fe-Si-based alloy particles including 4-10 mass% of Si with the balance consisting of Fe and inevitable impurities. The insulator coating is an oxide material including an Fe oxide and a Si oxide. The powder-compact magnetic core has a relative density of 93% or more.SELECTED DRAWING: Figure 1