Method for producing composite magnetic body, magnetic powder, composite magnetic body and coil component
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorTakeshi Takahashi
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Abstract
A method for producing a composite magnetic body includes: pressure molding a metal magnetic material into a predetermined shape, the metal magnetic material being an Fe—Si-based metal magnetic material; performing a primary heat treatment of heating the metal magnetic material in an atmosphere with a first oxygen partial pressure to form an Si oxide coating film on a surface of the metal magnetic material; and performing a secondary heat treatment of heating the metal magnetic material that has undergone the primary heat treatment in an atmosphere with a second oxygen partial pressure, which is higher than the first oxygen partial pressure, to form an Fe oxide layer at least partially on a surface of the Si oxide coating film.
Claims3
A magnetic powder, comprising:
- a metal magnetic material that is an Fe—Si-based metal magnetic material;
- an Si oxide coating film that covers a surface of the metal magnetic material;
- and
- an Fe oxide layer that is formed at least partially on a surface of the Si oxide coating film.
Dependencies are inferred from the claim text.