Murata Manufacturing Co., Ltd.

Tohoku Magnet Institute Co., Ltd.

Alps Alpine Co., Ltd.

Toru Takahashi

Akihiro Makino

Noriharu Yodoshi

Kazuhiro Henmi

A soft magnetic powder according to the present disclosure comprises a particle which comprises a plurality of nanosized crystallites and an amorphous phase existing around the crystallites, wherein the crystallites have an average grain diameter of 30 nm or less, and the amorphous phase has an average thickness of 30 nm or less; and wherein when a minor axis of a cross section of the particle is determined as r, an average Fe concentration in the amorphous phase is lower than an average Fe concentration in the crystallites in a region where a depth from a surface of the particle is 0.2 r or more and 0.4 r or less.

Soft magnetic material and method for manufacturing the same

A soft magnetic powder according to the present disclosure comprises a particle having no hollow part as a main component, wherein a number of hollow particle present in a region of 2.5 mm square is 40 or less in a cross section of a molded body obtained by powder-compacting and molding the soft magnetic powder so as to have a volume filling rate of 75% or more and 77% or less (i.e., from 75% to 77%).

Soft magnetic powder

A magnetic powder is represented by general formula Fe(SiBP), 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 V. 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.

Magnetic powder and production method thereof, magnetic core and production method thereof, coil component and motor

A magnetic powder is represented by general formula FeSiBPCu. 71.0&#x2264;a&#x2264;81.0, 0.14&#x2264;b/c&#x2264;5, 0&#x2264;d&#x2264;14, 0&#x3c;e&#x2264;1.4, d&#x2264;0.8&#x2212;50, e&#x3c;&#x2212;0.1(+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.

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Nagaokakyo, Japan

Toru Takahashi