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

摘要

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.

主权项

1. A ferromagnetic amorphous alloy ribbon comprising:
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, 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 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 on the ribbon surface facing the chill body surface with the surface protrusions growing in size and frequency with increasing casting time; the ribbon surface protrusions being measured in terms of a protrusion height and a number of protrusions, a number of points on the ribbon surface with protrusion heights exceeding 3 μm and less than four times the ribbon thickness, and the number of protrusions being greater than zero and less than 10 per area of 1.5 m of the ribbon length and 100 mm of the ribbon width, and 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 magnetic core 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.