Soft magnetic material, method for producing soft magnetic material, and electric motor
AssigneeHitachi, Ltd.
InventorsKazuya Shinagawa, Matahiro Komuro, Yusuke Asari, Shohei Terada
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Abstract
Soft magnetic materials containing Fe and Co in a total amount of 90 mass % or more are provided herein. The soft magnetic materials contain 50 mass % or more of Fe, 40 mass % or less of Co, 0.1 mass % or less of C, 2.0 mass % or less of Ni, 0.2 mass % or less of Mn, Si, Cr, Ti, Nb, and V, and inevitable impurities; and a precipitate of a compound of iron and nitrogen. The precipitate is created by tension annealing a raw material of the soft magnetic material. Methods of producing the soft magnetic materials are further provided. Electric motors using the soft magnetic materials are further provided.
Claims13
A soft magnetic material comprising Fe and Co in a total amount of 90 mass % or more, wherein:
- contained components are 50 mass % or more of Fe, 40 mass % or less of Co, 0.1 mass % or less of C, 2.0 mass % or less of Ni, 0.2 mass % or less of Mn, Si, Cr, Ti, Nb, and V, and inevitable impurities;
- the soft magnetic material comprises a precipitate of a compound of iron and nitrogen;
- and
- wherein a volume ratio of face-centered cubic crystals contained in the soft magnetic material is from 2% to 5%.
A method for producing a soft magnetic material, comprising:
- subjecting a soft magnetic material raw material containing Fe and Co in a total amount of 90 mass % or more to a heat treatment in a nitrogen atmosphere;
- rapidly cooling the soft magnetic material raw material that has undergone the subjecting;
- and
- annealing the soft magnetic material raw material after the rapidly cooling while applying a tensile stress to provide the soft magnetic material;
- wherein a volume ratio of face-centered cubic crystals contained in the soft magnetic material after the annealing is from 2% to 5%.
Dependencies are inferred from the claim text.