Patent ID: 11901101
Assignee: SEIKO EPSON CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC H  B  C  G  Y | IPC B  C  G  H

Claim 0:
1. An insulating material-coated soft magnetic powder including a plurality of individual particles, each individual particle comprising:
a core particle that includes a base portion containing a soft magnetic material containing Fe as a main component and at least one of Si, Cr, and Al, and that includes an oxide film provided on a surface of the base portion and containing an oxide of at least one of Si, Cr, and Al; and
an insulating film that is provided on a surface of the core particle and that contains a ceramic,
wherein a thickness of the insulating film is 5 nm or more and 300 nm or less as measured from an interface between the insulating film and the oxide film using a scanning transmission electron microscope where an integrated state of the oxide film and the insulating film are confirmed,
the oxide contained in the oxide film and the ceramic contained in the insulating film are mutually diffused at the interface between the oxide film and the insulating film,
the insulating film is formed from melted or sintered insulating particles that collectively define a layer that surrounds the oxide film, and
a majority of the insulating film is occupied by the insulating particles in a melted or sintered state that do not retain a particle shape rather than by insulating particles in the form of a particle that are not melted or sintered.