Ferromagnetic amorphous alloy ribbons with reduced surface protrusions, their casting methods and applications

Japanese Patent JP6346691

B2

A ferromagnetic amorphous alloy ribbon includes an alloy having a composition represented by FeaSibBcCd where 80.5≰a≰83 at. %, 0.5≰b≰6 at. %, 12≰c≰16.5 at. %, 0.01≰d≰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 μm 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.

Eric Sen, Sayssen
Perez, james
Yuichi Ogawa
Yuji Matsumoto
East earth
Hasegawa, Ryusuke

JP2017087223A

June 20, 2018

April 26, 2017

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Methograss Incorporated
Hitachi Metals Co., Ltd.

C22C45/02; C21D6/00; H01F1/153; H01F27/25; H01F41/02

JP11302823A
JP2000328206A
JP2000054089A

Shinjiro Ono
Osamu Yamamoto
Toru Miyamae
Motoharu Nakanishi
Hiroaki Noya

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