Soft Magnetic Properties of Amorphous ring Cores Prepared via Spark Plasma Sintering Using Fe-based Amorphous Powders (Fe, Co)68.7(C, Si, B, P)24.5(Mo, Al)6.8

초록

An Fe-based amorphous alloy (Fe, Co) 68.7 (C, Si, B, P) 24.5 (Mo, Al) 6.8 was prepared as amorphous ribbons (~ 25 μm thick)and amorphous rods (Ф3 mm), which were crushed and sieved to form powders with diff erent shapes and particles smallerthan 53 μm: amorphous fl ake powders made from crushed ribbons and amorphous irregular powders made from crushedrods. Both powders were consolidated via spark plasma sintering into dense ring cores with a relative density exceeding90%; this high density is attributed to the Newtonian flow within the temperature range of the amorphous powder’ssupercooled liquid region. Excellent soft magnetic properties originating from the amorphous nature and high density ofthe ring cores were confi rmed. Additionally, due to electrical isolation between the powder particles, the eddy current lossof the amorphous ring cores made from the SiO 2 -coated amorphous fl ake powder was signifi cantly reduced to 4.86 W/kg (at Bm = 100 mT, 1 kHz).

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