Method for producing soft magnetic metal powder coated with Mg-containing oxide film
AssigneeDiamet Corporation
InventorsMuneaki Watanabe, Ryoji Nakayama, Gakuji Uozumi
Life of this patent
Estimating the term…
Abstract
A method for producing a soft magnetic metal powder coated with a Mg-containing oxide film, comprising the steps of adding and mixing a Mg powder with a soft magnetic metal powder which has been subjected to heating treatment in an oxidizing atmosphere at a temperature of 40 to 500° C. to obtain a mixed powder, and heating the mixed powder at a temperature of 150 to 1,100° C. in an inert gas or vacuum atmosphere under a pressure of 1×10−12 to 1×10−1 MPa, while optionally tumbling; and a method for producing a composite soft magnetic material from the soft magnetic metal powder coated with a Mg-containing oxide film.
Claims6
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 1×10−12 to 1×10−1 MPa, thereby obtaining a soft magnetic metal powder coated with Mg-containing oxide film,
- 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.
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 resistivity of 65 μΩm or more, comprising the steps of:
- adding and mixing a Mg powder with a soft magnetic metal powder having an average particle diameter in the range of 5 to 500 μm 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, and heating said mixed powder at a temperature of 150 to 1,100° C. in an inert gas or vacuum atmosphere under a pressure of 1×10−12 to 1×10−1 MPa,
- followed by heating said mixed powder in an oxidizing atmosphere at a temperature of 50 to 400° C. to effect oxidation treatment, thereby obtaining a soft magnetic metal powder coated with a Mg-containing oxide film,
- 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.
Dependencies are inferred from the claim text.