真空与磁场热处理改善FeCo合金的软磁性能

Improvement of soft magnetic properties of FeCo core alloy by vacuum and field annealing

针对发电机中转子用FeCo合金 (国产牌号 1J2 2 )进行了组织结构与磁性能的研究 .通过对该合金进行真空处理以及磁场热处理 ,研究了组织结构对软磁性能的影响规律 ;研究了附加磁场强度以及热处理温度对磁场处理效果的影响 ,并结合该合金的磁致伸缩伸缩系数的变化规律 ,分析了磁场热处理效果的微观机制 .当合金组织为轧制态时 ,磁场热处理效果不明显 ;在合金的再结晶温度以上进行磁场热处理时 ,获得了显著的磁场热处理效果 ,矫顽力下降至 72A m( 0 9Oe)

Microstructures and soft magnetic properties of FeCo alloy were investigated in an attempt to improve its soft magnetic properties. Microstructural dependence of the magnetic properties was studied by vacuum annealing at various temperatures. Magnetic field annealing was performed to study the dependence of the coercivity on the magnetic filed applied during annealing. The field annealing effect was observed only for the alloys after recrystallization, and was increased with the increase of the applied field within the range of 2.0×104 A/m (250 Oe). Coercivity of the FeCo alloys was decreased to 72 A/m (0.9 Oe) after annealing with a magnetic field of 1.76×104 A/m (220 Oe) at 850°C. The microscopic mechanism of the field annealing effect was also discussed in terms of magnetostrictive characterization.