Patent ID: 8968489
Filing Date: 2015-03-03
Classification: B22D,H01F

Abstract:
1. A ferromagnetic amorphous alloy 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 ribbon surface defects on the ribbon surface facing the casting atmosphere side, the ribbon surface defects being measured in terms of a defect length, a defect depth, and defect occurrence frequency, 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 the ribbon 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 a 1.3 T induction level in an annealed straight strip form, and a core magnetic loss of less than 0.3 W/kg and an exciting power of less than 0.4 VA/kg when measured at 60 Hz and at a 1.3 T induction level in an annealed wound transformer core form.