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.