Abstract
Nanocrystalline Fe–Si–B–P–Cu alloys exhibit high saturation magnetic flux density (Bs) and extremely low magnetic core loss (W), simultaneously. Low amorphous-forming ability of these alloys hinders their application potential in power transformers and motors. Here we report a solution to this problem. Minor addition of C is found to be effective in increasing the amorphous-forming ability of Fe–Si–B–P–Cu alloys. It allows fabrication of 120mm wide ribbons (which was limited to less than 40mm) without noticeable degradation in magnetic properties. The nanocrystalline (Fe85.7Si0.5B9.5P3.5Cu0.8)99C1 ribbons exhibit low coercivity (Hc)~4.5A/m, high Bs~1.83T and low W~0.27W/kg (@ 1.5T and 50Hz). Success in fabrication of long (60–100m) and wide (~120mm) ribbons, which are made up of low cost elements is promising for mass production of energy efficient high power transformers and motors
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