WIDE IRON-BASED AMORPHOUS ALLOY THIN STRIP HAVING IMPROVED MAGNETIC PROPERTIES AND METHOD OF MAKING THE SAME

摘要

It is an object of the present invention to provide a broad amorphous alloy thin ribbon for a power transformer iron core having a Fe-Si-B-C composition with a wide width of 70 mm or more and particularly a high magnetic flux density.;In the Fe-Si-B-C amorphous alloy, the addition of C improves the magnetic properties in the narrow band, but deteriorates the characteristics in the broad band.;Therefore, by adjusting the surface roughness by casting in an atmosphere containing Mn in a small amount or in an atmosphere containing at least 40 vol% of carbonic acid gas, the property deviation of the amorphous structure in the width direction is eliminated and the deterioration of characteristics in the wide width material is suppressed Respectively.