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US 12,046,415 B2Granted
Method for manufacturing dust core and dust core
AssigneeSeiko Epson Corporation
InventorsYasutaka Matsumoto, Sukenori Ichikawa
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Abstract
A method for manufacturing a dust core, includes: applying energy to a surface of a soft magnetic powder coated with an insulating body containing a compound having an aluminum-oxygen bond; exposing the soft magnetic powder to an atmosphere having a dew point of −30° C. or higher and 15° C. or lower under an atmospheric pressure; and forming a molded product by pressing the soft magnetic powder at 20 MPa or more and 400 MPa or less.
Claims5
A method for manufacturing a dust core, comprising:
- coating particles of a soft magnetic powder with an insulating body, the insulating body containing a compound having an aluminum-oxygen bond;
- after coating the particles of the soft magnetic powder with the insulating body, subjecting a surface of the particles of the soft magnetic powder coated with the insulating body to irradiation with ultraviolet rays or subjecting the soft magnetic powder to an ionized gas or an ozone gas;
- after subjecting the surface of the particles of the soft magnetic powder coated with the insulating body to irradiation with ultraviolet rays or subjecting the soft magnetic powder to an ionized gas or an ozone gas, exposing the soft magnetic powder to an atmosphere having a dew point of −30° C. or higher and 15° C. or lower under an atmospheric pressure;
- and
- forming a molded product by pressing the soft magnetic powder at 20 MPa or more and 400 MPa or less,
- wherein the compound having the aluminum-oxygen bond is selected from the group consisting of trimethoxyaluminum, triethoxyaluminum, and polymethylaluminoxane.
3 more elements
Dependencies are inferred from the claim text.