Soft magnetic material, compressed powder magnetic core and method for producing compressed power magnetic core
AssigneeSumitomo Electric Industries, Ltd.
InventorsTerukazu Tokuoka, Kazuhiro Hirose, Haruhisa Toyoda, Takao Nishioka, Kouhei Sawada
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Abstract
A soft magnetic material has an iron based powder that has an insulating coating on the surface and an ester wax. The ester wax is added in an amount not less than 0.02% by weight and not more than 0.6% by weight in relation to the soft magnetic material. Consequently, seizure between a metal mold and a material to be molded at the time of molding can be suppressed and the arising of a black residue can be prevented.
Claims12
A compressed powder magnetic core comprising a soft magnetic material and manufactured by compacting the soft magnetic material, wherein the soft magnetic material comprises:
- an iron-based powder that has an insulating coating on its surfaces;
- and
- at least 1 type of wax that comprises an ester wax;
- wherein the soft magnetic material comprises at least 0.02% by weight and no more than 0.6% by weight of said wax that comprises said ester wax, wherein
- the average particle size of said wax that comprises said ester wax is at least 0.5 μm and no more than the average particle size of said iron based powder that has said insulating coating, and wherein,
- the wax that comprises said ester wax is interposed between particles of the iron based powder.
Dependencies are inferred from the claim text.