Soft magnetic powder-core composites of Fe 90 Zr 7 B 3 and Fe 49 Co 21 Al 5 Ga 2 P 9.65 C 5.75 B 4.6 Si 3 alloys

Amorphous and nanocrystalline alloys in ribbon form exhibit excellent soft magnetic properties, but their forms are limited to tape wound cores. Complex shapes require the implementation of a powder metallurgical approach resulting in reduced permeabilities. The present study investigates Fe-based Fe 90 Zr 7 B 3 (C1) and Fe 49 Co 21 Al 5 Ga 2 P 9.65 C 5.75 B 4.6 Si 3 (C2) melt-spun ribbons as precursors for compacted powder cores. Single-roller melt spinning of C1 produced partially crystallized structures while C2 resulted in amorphous ribbons. Annealing studies were carried out based on the crystallization temperatures of various phases extracted from M ( T ) measurements. In ribbon form and under optimum annealing conditions, C1 revealed a 1.88 T saturation flux density ( B s ) and 44 A ∕ m coercivity ( H c ) , while C2 exhibited a B s of 0.78 T and H c of 2.4 A ∕ m .