Soft magnetic material and dust core produced therefrom
AssigneeSumitomo Electric Industries, Ltd.
InventorsToru Maeda, Yasushi Mochida, Takao Nishioka
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Abstract
A soft magnetic material includes a plurality of composite magnetic particles each including a metal magnetic particle and an insulating coating film covering the metal magnetic particle. Each of the plurality of composite magnetic particles has a ratio Rm/c of a maximum diameter to a circle-equivalent diameter of more than 1.15 and not more than 1.35. The insulating coating film is composed of a thermosetting organic material and has a pencil hardness of 5H or higher after thermosetting. With this material, an eddy current loss can be reduced, and a compact with a high strength can be formed.
Claims6
A soft magnetic material comprising:
- a plurality of composite magnetic particles each including a metal magnetic particle and an insulating coating film covering the metal magnetic particle,
- wherein each of the plurality of composite magnetic particles has a ratio Rm/c of a maximum diameter to a circle-equivalent diameter of more than 1.15 and not more than 1.35,
- wherein the insulating coating film is composed of a thermosetting organic material and has a pencil hardness of 5H or higher after thermosetting, and
- wherein the metal magnetic particle contains Fe as the main component.
Dependencies are inferred from the claim text.