Studies on the magnetic properties of FeSiBCCr amorphous bulk sintered via spark plasma sintering

Fe-based amorphous alloys are widely utilized due to their exceptional soft magnetic properties. Among them, FeSiBCCr stands out as an ideal composite material for molded inductors. This paper examines the magnetic characteristics of FeSiBCCr amorphous bulk that has been sintered at various temperatures using spark plasma sintering technique, without the use of additional binders or insulating coatings. The experimental findings indicate that both the density and the real permeability of the bulk increase with rising sintering temperatures. This enhancement occurs as adjacent particles merge, leading to a reduction of the gaps and porosities between the particles under high pressure, which diminishes the demagnetization field within the amorphous samples. Furthermore, the study reveals that as frequency increases, the eddy current loss per cycle rises with elevated sintering temperatures while the hysteresis loss per cycle remains constant.