Fe–Si–B–P–Cu Nanocrystalline Alloy Ribbons With High Saturation Magnetic Flux Density Prepared Using Industrial Materials

Magnetic properties and fine structure of Fe-Si-B-P-Cu nanocrystalline alloy ribbons have been investigated. The Fe84.8(Si,B,P)14Cu1.2alloy ribbons using industrial materials are produced by a single-roller melt-spinning method in air. The Fe84.8(Si,B,P)14Cu1.2nanocrystalline alloys exhibit low coercivity Hcof 7-20 A/m in the compositional range of Si=0-2 at% and P=2-8 at% and high saturation magnetic flux density Bsof 1.80 T or more in the compositional range of P=0-4 at%. In particular, Fe84.8Si1B10P3Cu1.2nanocrystalline alloy annealed at 698 K exhibits both the high Bsof 1.82 T and the low Hcof 7.2 A/m. The iron lossWat 50 Hz of the Fe84.8Si1B10P3Cu1.2nanocrystalline alloy is much smaller than oriented and nonoriented magnetic steel over the maximum induction Bmrange up to 1.7 T. In addition, nanocrystalline structure of the Fe84.8Si1B10P3Cu1.2alloy exhibits a homogeneous nanocrystalline structure composed of α-Fe grains with 5-20 nm in diameter even using industrial materials. Therefore, the Fe-Si-B-P-Cu nanocrystalline alloy has good soft magnetic properties and a large economical advantage of low material cost by using industrial materials.