SWAP法によるFe基アモルファス磁性粉末の作製とその成形磁心の磁気特性 (<特集>ソフト材料)

概要

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Amorrphous Fe_<75>Si_<12.5>B_<12.5> powders were fabricated by spinning water atomization process (SWAP). The powders obtained exhibited good soft-magnetic properties up to particle size of about 200-300 μm. These amorphous particles were insulated by glass powder and pressed into toroidal and E shape cores by hot-pressing techniques at relatively high temperature conditions below crystallization temperature. The densities of the pressed cores were about 80-85%. The magnetic properties of toroidal samples 20 mm in diameter were measured after annealing. For the core pressed at 1.5 GPa, 465℃, the core loss at 100 kHz was 13 J/m^3= (=1.3 W/cc) for B_m=0.1 T and the initial permeability was about 100 in the frequency range up to 1 MHz for H_m = 5 mOe, which were comparable to those of commercial Sendust compressed corse and Fe-based gapped amorphous ribbon cores for application to fly-back transformers or choking coils operating at frequencies above 100 kHz.
社団法人日本磁気学会の論文
1997-04-15