Abstract
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((Co0.95Fe0.05)1-xCrx)75Si15B10 (x=0, 0.025, 0.05, 0.075). The powders obtained were in the amorphous state at particlesize up to 500 μm and exhibited good magnetic softness. The coercive force of powders was about 27.1-53.3 A/m.Furthermore, Co-based amorphous powder cores with glass binders were also fabricated by pressing and annealingmethods. For the core pressed at 2 GPa in room temperature and annealed at 763 K ×15 min. in air, the initialpermeability up to 100 kHz was about 110 and the core loss at 100 kHz for Bm=0.05 T was 85 kW/m3. Comparedwith Fe-based amorphous powder core, the former was 30 % higher and the latter was 40 % lower.
