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, Akihiro MAKINO, Noriharu YODOSHI
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Abstract
A magnetic powder is represented by general formula FeaSibBcPdCue. 71.0≦a≦81.0, 0.14≦b/c≦5, 0≦d≦14, 0<e≦1.4, d≦0.8a−50, e<−0.1(a+d)+10, and a+b+c+d+e=100. A crystallinity is not more than 30% in the case of containing an amorphous phase and a compound phase, and is not more than 60% in the case of not containing a compound phase. The magnetic powder is produced with a gas atomization method. Whereby, it is possible to obtain an alloy magnetic material which has high saturation magnetic flux density and low magnetic loss; and a magnetic core, coil components, and a motor can be realized.
Claims20
A magnetic powder comprising
- a principal component represented by a general formula FeaSibBcPdCue,
- wherein the a, the b, the c, the d, and the e satisfy:
- 71.0≦a≦81.0,
- 0.14≦b/c≦5,
- 0≦d≦14,
- 0<e≦1.4,
- d≦0.8a−50,
- e<−0.1(a+d)+10, and
- a+b+c+d+e=100.
A method for producing a magnetic powder comprising:
- mixing at least simple elements of Fe, Si, B, P and Cu or compounds containing these elements so that a principal component satisfies a general formula FeaSibBcPdCue;
- heating a mixed product 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 the a, the b, the c, the d, and the e satisfy:
- 71.0≦a≦81.0,
- 0.14≦b/c≦5,
- 0≦d≦14,
- 0<e≦1.4,
- d≦0.8a−50,
- e<−0.1(a+d)+10, and
- a+b+c+d+e=100.
Dependencies are inferred from the claim text.