Magnetic Properties of Fe-Based Amorphous Powders With High-Saturation Induction Produced by Spinning Water Atomization Process (SWAP)

Fe-based amorphous powders with high magnetic flux density were fabricated in an extremely high cooling rate of over 10 <sup>6</sup> K/s by spinning water atomization process (SWAP). The composition of the alloys studied were Fe <sub>79</sub>(Si <sub>0.5</sub>B <sub>0.5</sub>) <sub>19</sub>C <sub>2</sub> and Fe <sub>x</sub>(Si <sub>0.3</sub>B <sub>0.7</sub>) <sub>98-x</sub>C <sub>2</sub> (x = 79,80,81,83,84). The saturation flux density Bs increased with increasing iron content. For Fe <sub>83</sub>(Si <sub>0.3</sub>B <sub>0.7</sub>) <sub>15</sub>C <sub>2</sub>, the Bs value was 1.64 T, which is 31% higher than that of our previously developed (Fe <sub>0.97</sub>Cr <sub>0.03</sub>) <sub>76</sub>(Si <sub>0.5</sub>B <sub>0.5</sub>) <sub>22</sub>C <sub>2</sub> alloy. Furthermore, consolidated cores of amorphous powders were also fabricated by compact-pressing techniques.