Hitachi Metals, Ltd.

Metglas, Inc.

James Perrozi

Ryusuke Hasegawa

Eric Theisen

Yuichi Ogawa

Yuji Matsumoto

Daichi Azuma

A ferromagnetic amorphous alloy ribbon includes an alloy having a composition represented by FeSiBCwhere 80.5&#x2266;a&#x2266;83 at. %, 0.5&#x2266;b&#x2266;6 at. %, 12&#x2266;c&#x2266;16.5 at. %, 0.01&#x2266;d&#x2266;1 at. % with a+b+c+d=100 and incidental impurities, the defect length along a direction of the ribbon's length being between 5 mm and 200 mm, the defect depth being less than 0.4&#xd7;t &#x3bc;m and the defect occurrence frequency being less than 0.05&#xd7;w times within 1.5 m of ribbon length, where t and w are ribbon thickness and ribbon width, respectively, and the ribbon in its annealed state and straight strip form of the ribbon, has a saturation magnetic induction exceeding 1.60 T, and exhibits a magnetic core loss of less than 0.14 W/kg when measured at 60 Hz and at 1.3 T induction level. The ribbon is suitable for use in transformer cores, rotational machines, electrical chokes, magnetic sensors and pulse power devices.

Ferromagnetic amorphous alloy ribbon and fabrication thereof

A ferromagnetic amorphous alloy ribbon includes an alloy having a composition represented by FeSiBCwhere 80.5&#x2266;a&#x2266;83 at. %, 0.5&#x2266;b&#x2266;6 at. %, 12&#x2266;c&#x2266;16.5 at. %, 0.01&#x2266;d&#x2266;1 at. % with a+b+c+d=100 and incidental impurities, the ribbon being cast from a molten state of the alloy with a molten alloy surface tension of greater than or equal to 1.1 N/m on a chill body surface; the ribbon having a ribbon length, a ribbon thickness, and a ribbon surface facing the chill body surface; the ribbon having ribbon surface protrusions being formed on the ribbon surface facing the chill body surface; the ribbon surface protrusions being measured in terms of a protrusion height and a number of protrusions; the protrusion height exceeding 3 &#x3bc;m and less than four times the ribbon thickness, and the number of protrusions being less than 10 within 1.5 m of the cast ribbon length; and the alloy ribbon in its annealed straight strip form having a saturation magnetic induction exceeding 1.60 T and exhibiting a magnetic core loss of less than 0.14 W/kg when measured at 60 Hz and at 1.3 T induction level in its annealed straight strip form. The ribbon is suitable for transformer cores, rotational machines, electrical chokes, magnetic sensors, and pulse power devices.

Ferromagnetic amorphous alloy ribbon with reduced surface protrusions, method of casting and application thereof

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Myrtle Beach, SC, United States of America

James Perrozi