Patent ID: 8974609
Filing Date: 2015-03-10
Classification: B22D,H01F,Y10T

Abstract:
1. A ferromagnetic amorphous alloy ribbon produced by a continuous casting, the ribbon comprising: an alloy having a composition represented by Fe the ribbon having been cast from a molten state of the alloy, with a molten alloy surface tension of greater than or equal to 1.1 N/m, the ribbon having a ribbon length, a ribbon thickness, a ribbon width, and a ribbon surface facing a casting atmosphere side, the ribbon having a defect occurrence frequency greater than zero and less than 0.05×w times per 1.5 m of the ribbon length, where w is the ribbon width in mm, wherein upon a defect occurring, the defect is on the ribbon surface facing the casting atmosphere side and is measured in terms of a defect length, a defect depth, and a defect occurrence frequency, and wherein the defect length along a direction of the ribbon's length is between 5 mm and 200 mm, the defect depth being at less than 0.4×t μm, where t is the ribbon thickness in μm, and wherein when the ribbon has been annealed and is in a straight strip form, 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 a 1.3 T induction level.