Co基アモルファス粉末成形磁心の磁気特性

概要

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Co-based amorphous powder was produced by a new atomization process "Spinning Water Atomization Process (SWAP)", having both rapid super-cooling rate and mass production potential. The composition of the alloys was ((Co_<0.95>Fe_<0.05>)_<1-x>Cr_x)_<75>Si_<15>B_<10> (x=0, 0.025, 0.05, 0.075). The powders obtained were in the amorphous state at particle size up to 500μm and exhibited good magnetic softness. The coercive force of powders was about 27.1-53.3A/m. Furthermore, Co-based amorphous powder cores with glass binders were also fabricated by pressing and annealing methods. For the core pressed at 2GPa in room temperature and annealed at 763K×15min. in air, the initial permeability up to 100kHz was about 110 and the core loss at 100kHz for Bm=0.05 T was 85kW/m^3. Compared with Fe-based amorphous powder core, the former was 30% higher and the latter was 40% lower.
社団法人日本磁気学会の論文
2007-01-01