Magnetic powder and production method thereof, magnetic core and production method thereof, coil component and motor
AssigneesMurata Manufacturing Co., Ltd., Tohoku Magnet Institute Co., Ltd.
InventorsToru TAKAHASHI, Kazuhiro HENMI, Akihiro MAKINO, Noriharu YODOSHI
Life of this patent
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Abstract
A magnetic powder is represented by general formula Fea(SibBcPd)100-a, and is produced with a gas atomization method. When the value of a and the value of b in the general formula is represented (a, b), (a, b) is within a predetermined region V1. Similarly, (a, c) and (a, d) are within a predetermined region, respectively. Whereby, it is possible to obtain an alloy magnetic powder which has high saturation magnetic flux density, low magnetic loss, and is spherical and easy to handle; and a magnetic core, a variety of coil components, and a motor can be realized by using the magnetic material.
Claims20
A magnetic powder comprising
- a principal component represented by a general formula Fea(SibBcPd)100-a and which is produced with a gas atomization method,
- wherein when representing as (a, b) the a and the b, (a, b) is within a region surrounded by A1(71.0, 0.19), B1(79.6, 0), C1(80.0, 0), D1(81.0, 0.17), E1(81.0, 0.44), F1(79.6, 0.78) and G1(71.0, 0.38),
- when representing as (a, c) the a and the c, (a, c) is within a region surrounded by A2(71.0, 0.48), B2(78.1, 0), C2 (79.6, 0), D2(81.0, 0.18), E2(81.0, 0.26), F2(79.1, 0.75) and G2(71.0, 0.72), and
- when representing as (a, d) the a and the d, (a, d) is within a region surrounded by A3(71.0, 0.08), B3(71.9, 0), C3(79.1, 0), D3(81.0, 0.36), E3(81.0, 0.62), F3(77.2, 0.67) and G3(71.0, 0.23).
A method for producing a magnetic powder comprising:
- mixing at least simple elements of Fe, Si, B and P or compounds containing these elements so that a principal component satisfies a general formula Fea (SibBcPd)100-a,
- heating a mixture obtained by the mixing to prepare a molten metal, and
- spraying an inert gas to the molten metal to pulverize the molten metal,
- wherein in the mixing step, the single elements or the compounds are mixed so that (a, b) satisfies a region surrounded by A1(71.0, 0.19), B1(79.6, 0), C1(80.0, 0), D1(81.0, 0.17), E1(81.0, 0.44), F1(79.6, 0.78) and G1(71.0, 0.38) when representing as (a, b) the a and the b,
- (a, c) satisfies a region surrounded by A2 (71.0, 0.48), B2(78.1, 0), C2(79.6, 0), D2(81.0, 0.18), E2(81.0, 0.26), F2(79.1, 0.75) and G2(71.0, 0.72) when representing as (a, c) the a and the c, and
- (a, d) satisfies a region surrounded by A3 (71.0, 0.08), B3(71.9, 0), C3(79.1, 0), D3(81.0, 0.36), E3(81.0, 0.62), F3(77.2, 0.67) and G3(71.0, 0.23) when representing as (a, d) the a and the d.
Dependencies are inferred from the claim text.