納米復合（NdDy）2（FeNb）14B/α-Fe永磁合金

納米復合（NdDy）₂（FeNb）₁₄B/α-Fe永磁合金

摘要: 采用單輥急冷法并晶化退火制備了高剩磁、高矯頑力和高磁能積的(NdDy)₂(FeNb)₁₄B/α-Fe納米復合永磁合金,其最佳磁性能分別為B_r=1.02 T,H_ci=702 KA/m,(BH)_max=134 KJ/m³.合金的組織結構由硬磁相(NdDy)₂(FeNb)₁₄B和軟磁相α-Fe在納米級范圍內復合而成.兩相的平均晶粒尺寸為30nm.該種合金優異的磁性能起源于納米晶硬磁相和軟磁相之間的磁交換耦合作用.

Abstract: High coercivity, high remanence, and high energy product (NdDy)₂(FeNb)₁₄B/α-Fe nanocrystalline alloys are prepared by melt spining and subsequent annealing. The best properties of remanence (B_r), coercivity (H_ci) and maximum energy product ((BH)_max) are 1.02 T, 702 kA/m and 134 kJ/m³, respectively. The microstructure of the two phase nanocomposite consists of hard magnetic (NdDy)₂(FeNb)₁₄B and soft magnetic α-Fe with an average size of 30 nm. These small dimensions allow effective exchange coupling between hard and soft magnetic grains and result in the simultaneous enhancement of B_r,H_ci and (BH)_max.