Patent ID: 11972885
Assignee: TAIYO YUDEN CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A magnetic material comprising a sintered grain compact in which metal grains provided, respectively, with oxide films are compacted, wherein:
the metal grains are constituted by Fe—Si-M soft magnetic alloy where M represents a metal element that oxidizes more easily than iron, and a size of the metal grains based on d50 is 2 to 30 μm,
all the metal grains in the sintered grain compact are mutually bonded wherein each metal grain is inter-bonded with at least one adjacent metal grain at at least a single bonding area,
wherein all single bonding areas include inter-bonding of the oxide films having uneven thickness of the oxide films between the inter-bonded respective metal grains,
wherein some of the single bonding areas further include inter-bonding of metal grains via metal bonding in addition to the inter-bonding of the oxide films, and internal voids are present between the inter-bonded respective metal grains,

wherein all surfaces of the metal grains in the sintered grain compact exposed to the internal voids are covered with the oxide films in their entirety, and
at least some of the inter-bonding of oxide films takes a form of bonding of crystalline oxides, said oxide films consisting of elements corresponding to those obtained as a result of oxidation of the metal grains.