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 ⁶ K/s by spinning water atomization process (SWAP). The composition of the alloys studied were Fe ₇₉ (Si _0.5 B _0.5 ) ₁₉ C ₂ and Fe _x (Si _0.3 B _0.7 ) _98-x C ₂ (x = 79,80,81,83,84). The saturation flux density Bs increased with increasing iron content. For Fe ₈₃ (Si _0.3 B _0.7 ) ₁₅ C ₂ , the Bs value was 1.64 T, which is 31% higher than that of our previously developed (Fe _0.97 Cr _0.03 ) ₇₆ (Si _0.5 B _0.5 ) ₂₂ C ₂ alloy. Furthermore, consolidated cores of amorphous powders were also fabricated by compact-pressing techniques.