Novel FeCoBPSiCr Amorphous Alloy Powder with High Bs of 1.61 T and High Corrosion Resistance

Magnetic characteristics and amorphous stability for the fabrication of a powder with a corrosion behavior were investigated in (Fe 0.7 Co 0.3 ) 88-x-y B 11 P x Si y Cr 1 amorphous alloys and the powder along with a conventional Fe 79 Si 6 B 13 C 2 amorphous alloy and powder. The metallic ribbon with the composition of the (Fe 0.7 Co 0.3 ) 82 B 11 P 4 Si 2 Cr 1 exhibited high amorphous forming ability of 87 μm with a high saturation flux density (B s ) of 1.71 T as the optimum composition for powderization. The (Fe 0.7 Co 0.3 ) 82 B 11 P 4 Si 2 Cr 1 amorphous alloy ribbon with high corrosion potential of -520 mV showed the excellent corrosion resistance compared to the conventional Fe 79 Si 6 B 13 C 2 amorphous alloy with low corrosion potential of -677 mV in the water immersion test. The (Fe 0.7 Co 0.3 ) 82 B 11 P 4 Si 2 Cr 1 amorphous alloy powder consisted of a single amorphous phase exhibited the excellent corrosion resistance, and the high B s of 1.61 T as the conventional Fe 79 Si 6 B 13 C 2 amorphous alloy powder. High DC-Bias characteristic and the excellent corrosion resistance was recognized also in the inductive device using the (Fe 0.7 Co 0.3 ) 82 B 11 P 4 Si 2 Cr 1 amorphous alloy powder compared to the conventional Fe 79 Si 6 B 13 C 2 amorphous alloy powder.