| 摘要 |
<p>A composite soft magnetic sintered material which is prepared by a method which comprises mixing a composite soft magnetic powder comprising an iron powder, an Fe-Si type iron-base soft magnetic alloy powder, an Fe-Al type iron-base soft magnetic alloy powder, an Fe-Si-Al type iron-base soft magnetic alloy powder, or a nickel-base soft magnetic alloy powder (hereinafter, referred to as a soft magnetic metal powder) and a ferrite layer of a spinel structure, which covers the surface of the soft magnetic metal powder, with a silicon dioxide powder having an average particle diameter of 100 nm or less in an amount of 0.05 to 1.0 mass %, subjecting the resultant mixed powder to compact pressing, followed by sintering; or comprises mixing two or more types of composite soft magnetic sintered materials each comprising a soft magnetic metal powder and a ferrite layer having a spinel structure of a composition different from that of another ferrite layer, which covers the surface thereof, subjecting the resultant mixed powder to compact pressing, followed by sintering. The above composite soft magnetic sintered material has a high density and excellent mechanical strength, and further exhibits a high relative permeability at a high frequency.</p> |
