METHOD FOR PRODUCING SOFT MAGNETIC METAL POWDER COATED WITH MG-CONTAINING OXIDE FILM AND METHOD FOR PRODUCING COMPOSITE SOFT MAGNETIC MATERIAL USING SAID POWDER
First Claim
1. A method for producing a soft magnetic powder coated with a Mg-containing oxide film used for producing a composite soft magnetic material having a resistivity of 65 μ
- Ω
m or more, comprising the steps of;
subjecting a soft magnetic metal powder 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; 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, thereby obtaining a soft magnetic metal powder coated with Mg-containing oxide film, wherein said soft magnetic 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 μ
Ω
m or more.
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Accused Products
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.
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Citations
30 Claims
-
1. A method for producing a soft magnetic powder coated with a Mg-containing oxide film used for producing a composite soft magnetic material having a resistivity of 65 μ
- Ω
m or more, comprising the steps of;subjecting a soft magnetic metal powder 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; 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, thereby obtaining a soft magnetic metal powder coated with Mg-containing oxide film, wherein said soft magnetic 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 μ
Ω
m or more. - View Dependent Claims (2, 3, 13, 15)
- Ω
-
4. (canceled)
-
5. 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 μ
- Ω
m or more, comprising the steps of;adding and mixing a Mg powder with a soft magnetic metal powder to obtain a mixed powder; 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 heating 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 powder is an iron powder, an insulated 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, andwherein said soft magnetic metal powder is used for producing a composite soft magnetic material having resistivity of 65 μ
Ω
m or more. - View Dependent Claims (28, 29, 30)
- Ω
-
6-12. -12. (canceled)
-
14. (canceled)
-
16-21. -21. (canceled)
Specification