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

摘要

Magnetic properties and fine structure of Fe–Si–B–P–Cu nanocrystalline alloy ribbons have been investigated. The ${rm Fe}_{84.8}({rm Si},{rm B},{rm P})_{14}{rm Cu}_{1.2}$ alloy ribbons using industrial materials are produced by a single-roller melt-spinning method in air. The ${rm Fe}_{84.8}({rm Si},{rm B},{rm P})_{14}{rm Cu}_{1.2}$ nanocrystalline alloys exhibit low coercivity $H_{c}$ of 7–20 A/m in the compositional range of ${rm Si}=0hbox{--}2$ at% and ${rm P}=2hbox{--}8$ at% and high saturation magnetic flux density $B_{s}$ of 1.80 T or more in the compositional range of ${rm P}=0hbox{--}4$ at%. In particular, ${rm Fe}_{84.8}{rm Si}_{1}{rm B}_{10}{rm P}_{3}{rm Cu}_{1.2}$ nanocrystalline alloy annealed at 698 K exhibits both the high $B_{s}$ of 1.82 T and the low $H_{c}$ of 7.2 A/m. The iron loss $W$ at 50 Hz of the ${rm Fe}_{84.8}{rm Si}_{1}{rm B}_{10}{rm P}_{3}{rm Cu}_{1.2}$ nanocrystalline alloy is much smaller than oriented and nonoriented magnetic steel over the maximum induction $B_{m}$ range up to 1.7 T. In addition, nanocrystalline structure-n-n of the ${rm Fe}_{84.8}{rm Si}_{1}{rm B}_{10}{rm P}_{3}{rm Cu}_{1.2}$ alloy exhibits a homogeneous nanocrystalline structure composed of $alphahbox{--}{rm Fe}$ 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.