高磁束密度Fe基アモルファス軟磁性粉末および成形磁心の特性

抄録

Fe-based amorphous powders with high magnetic flux density were fabricated in an extremely high cooling rate of over 10⁶ K/s by SWAP. The composition of the alloys studied were Fe_x(Si_yB_1-y)_98-xC₂ {x=73-85 (at%), y=0.2-0.9 (at%)}. The saturation flux density Bs increased with increasing iron content. For Fe₈₃(Si_0.3B_0.7)₁₅C₂, the Bs value was 1.64 T, which is 31 % higher than that of our previously developed (Fe_0.97Cr_0.03)₇₆(Si_0.5B_0.5)₂₂C₂ alloy. Furthermore, the Fe₈₁(Si_0.3B_0.7)₁₇C₂ powder core exhibited superior magnetic properties compared with our previously developed Fe₇₆ system powder core. The core loss at 100 kHz for Bm=0.1 T was 450 kW/m³. This value was comparable to that of Fe₇₆ system powder core with a lower flux density.