Composite magnetic material and process for production
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsNobuya Matsutani, Takeshi Takahashi
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Abstract
A composite magnetic material manufactured by mixing a metal magnetic powder with an insulating binder to produce a mixed powder, press-molding the mixed powder to produce a molded product, and heat-treating the molded product in an oxidizing atmosphere at not lower than 80° C. and not higher than 400° C. to form an oxide film on a surface of the molded product. The metal magnetic powder includes Si, Fe, and component A, and the composition thereof satisfies 5.5%≦Si≦9.5%, 10%≦Si+component A≦13.5%, and the remainder is Fe, where % denotes weight %. The component A includes at least one of Ni, Al, Ti, and Mg.
Claims11
A production process of a composite magnetic material, the process comprising:
- mixing a metal magnetic powder with an insulating binder to produce a mixed powder;
- press-molding the mixed powder to produce a molded product, and
- heat-treating the molded product in an oxidizing atmosphere at not lower than 80° C. and not higher than 400° C. to form an oxide film on a surface of the molded product,
- wherein the metal magnetic powder includes Si, Fe, and component A, and a composition of the metal magnetic powder satisfies 5.5 wt %≦Si≦9.5 wt %, 10 wt %≦Si+component A≦13.5 wt %, and a remainder being Fe, and the component A includes at least one of Ni, Al, Ti, and Mg, and
- a core loss of the composite magnetic material that is measured at a measuring frequency of 120 kHz and at a measuring magnetic flux density of 0.1 T by using an alternating current BH curve measuring method is not more than 1500 kW/m3.
Dependencies are inferred from the claim text.