Ribbon-form silicon-iron alloy containing around 6.5 percent silicon

By rapid quenching techniques silicon-iron ribbons in polycrystalline state containing silicon in a range from 3.8 to 9.3 wt-percent were prepared. The speed for making ribbons was about 50m/s. The ribbons obtained were 20 to 150 μm in thickness, 2 to 25 mm in width, and 5 to 10 m in length. These ribbons were flexible and easily cold rolled. The grain size in the as-prepared ribbon was about 10 μm on the ribbon surface, and after annealing the grains grew to about 200 μm and a columnar structure perpendicular to the ribbon plane with grains extending through the entire thickness of the ribbon was observed. The coercive field in a straight ribbon 20 μm in thickness of composition 6.5Si-93.5Fe was 80 mOe after annealing at 1200°C for 35 minutes.