Industrialization of nanocrystalline Fe-Si-B-P-Cu alloys for high magnetic flux density cores

摘要

Nanocrystalline Fe-Si-B-P-Cu alloys exhibit high saturation magnetic flux density (B_s) 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 120 mm wide ribbons (which was limited to less than 40 mm) without noticeable degradation in magnetic properties. The nanocrystalline (Fe_(85.7)Si_(0.5)B_(9.5)P_(3.5)Cu_(0.8))_(99)C_1 ribbons exhibit low coercivity (H_c)～4.5 A/m, high B_s～ 1.83 T and low W～0.27 W/kg (@ 1.5 T and 50 Hz). Success in fabrication of long (60-100 m) and wide (～120 mm) ribbons, which are made up of low cost elements is promising for mass production of energy efficient high power transformers and motors.