Patent ID: 8409371
Filing Date: 2013-04-02
Classification: B22F,C22C,H01F

Abstract:
1. A method for producing a soft magnetic metal powder coated with a Mg-containing oxide film used for producing a composite soft magnetic material having a resistivity of 65 μΩm or more, comprising the steps of: subjecting a soft magnetic metal powder having an average particle diameter in the range of 5 to 500 μm to oxidation treatment to provide a raw powder material; adding and mixing a Mg powder with said raw powder material to obtain a mixed powder; the amount of the Mg powder being 0.05 to 2% by mass of the mass of the soft magnetic metal which has been subjected to oxidation treatment, and heating said mixed powder while tumbling at a temperature of 150 to 1,100° C. in an inert gas or vacuum atmosphere under a pressure of 1×10 wherein said soft magnetic metal powder is an iron powder, an insulated-iron powder, Fe—Al iron-based soft magnetic alloy powder, Fe—Ni iron based soft magnetic alloy powder, Fe—Cr iron-based soft magnetic alloy powder, Fe—Si iron-based soft magnetic alloy powder, Fe—Si—Al iron based soft magnetic alloy powder, Fe—Co iron-based soft magnetic alloy powder, Fe—Co—V iron-based soft magnetic alloy powder, or Fe—P iron-based soft magnetic alloy powder, and wherein said soft magnetic metal powder is used for producing a composite soft magnetic material having resistivity of 65 μΩm or more.