利用平面流铸造技术制备了不同厚度的Fe73.5Cu1Nb3Si15.5B7纳米晶带材，不同厚度带材经过卷绕制备出40 mm×25 mm×15 mm的纳米晶共模磁芯。研究了热处理温度、磁场等不同热处理条件和带材厚度对铁基纳米晶磁芯电感量的影响。结果表明，磁芯性能依赖于带材厚度和热处理制度。带材越薄，其高频优势越明显。对于不需要进行磁场处理的磁芯，其普通热处理的最佳温度为565 ℃；对于需要加磁场进行二次热处理的磁芯，其普通热处理最佳温度为575 ℃。选择合适的带材厚度和热处理制度对于提高纳米晶磁芯的性能尤为重要。

CMC cores (40 mm×25 mm×15 mm) were made from Fe-based nanocrystalline ribbons with different thickness which were prepared by planer flow casting method. The properties of cores depended on ribbon thickness and heat-treatment process. Thinner ribbon had better properties under high frequency. The best annealing temperature was 565 ℃ without magnetic field, and the best annealing temperature was 575 ℃ with magnetic field. It is important to select appropriate ribbon thickness and heat-treatment process to meet performance requirement of cores.