Soft-magnetic, amorphous alloy ribbon and its production method, and magnetic core constituted thereby

摘要

A soft-magnetic, amorphous alloy ribbon produced by a rapid quenching method, having transverse lines of recesses formed on its surface by laser beams with predetermined longitudinal intervals, with a doughnut-shaped projection formed around each recess; doughnut-shaped projections having smooth surfaces substantially free from splashes of the alloy melted by the irradiation of laser beams, and a height t2 of 2 μm or less; and a ratio t1/T of the depth t1 of the recesses to the thickness T of the ribbon being in a range of 0.025-0.18, thereby having low iron loss and low apparent power.

主权项

1. A soft-magnetic, amorphous alloy ribbon produced by a rapid quenching method, having transverse lines of recesses formed on its surface by laser beams with predetermined longitudinal intervals, with a doughnut-shaped projection formed around each recess; said recesses and said doughnut-shaped projections being constituted by an amorphous phase; said doughnut-shaped projections having smooth surfaces substantially free from splashes of the alloy melted by the irradiation of laser beams, and a height t2 of 2 μm or less; and a ratio t1/T of the depth t1 of said recesses to the thickness T of said ribbon being in a range of 0.025-0.18, wherein the number density of said recesses in the transverse lines is 2-20/mm, and wherein a surface of said ribbon to be irradiated with laser beams has reflectance of 15-80% at a wavelength λ of 1000 nm.