Soft magnetic powder, granulated powder, dust core, electromagnetic component, and method for producing dust core
AssigneeSumitomo Electric Industries, Ltd.
InventorsAsako Watanabe, Toru Maeda
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Abstract
Provided is a soft magnetic powder used for obtaining a dust core having a low hysteresis loss, in particular, in a high temperature range. A soft magnetic powder includes an aggregate of composite magnetic particles, each including a soft magnetic particle containing Fe, Si, and Al, and an insulating coating film disposed on the surface thereof, and satisfies the expressions (1) and (2) below: Expression (1) . . . 27≦2.5a+b≦29 and Expression (2) . . . 6≦b≦9, where a represents the Si content (mass %) and b represents the Al content (mass %). The soft magnetic powder is capable of reducing the hysteresis loss, in a high-temperature environment, of a dust core obtained using the soft magnetic powder.
Claims11
A soft magnetic powder comprising an aggregate of composite magnetic particles, each including a soft magnetic particle containing Fe, Si, and Al, and an insulating coating film disposed on a surface thereof,
- wherein the soft magnetic powder satisfying the expressions:
- 978/35≦18/7a +b ≦1023/35and 6.6≦b≦8.4,
- where a character a represents the Si content (mass %) and a character b represents the Al content (mass %) in the soft magnetic particles.
A dust core comprising a plurality of soft magnetic particles and an insulating layer interposed between the soft magnetic particles, wherein the soft magnetic particles containing Fe, Si, and Al and satisfying the expressions:
- 978/35≦18/7a +b ≦1023/35and 6.6≦b≦8.4,
- where a character a represents the Si content (mass %) and a character b represents the Al content (mass %).
Dependencies are inferred from the claim text.