通过对比实验研究了改进的制备工艺下FINEMET纳米晶磁粉芯的磁性能,并探讨了其相应的物理机制.采用扫描电镜、透射电镜和X射线衍射仪检测磁粉的表面形貌、内部结构和晶格畸变,采用B-H分析仪检测磁粉芯的动态磁性能.结果表明,改进的制备工艺能够有效降低磁粉芯的损耗,提高磁导率和频率应用范围.延长非晶粉末的球磨时间能够降低磁粉芯的磁滞损耗和涡流损耗,最佳的球磨时间为8 h.通过对比磁粉的晶格畸变,发现通过改进工艺制备的磁粉的晶格畸变相对较小,该工艺提高磁性能的原因在于磁粉残余内应力的有效释放.%The magnetic property of FINEMET nanocrystalline magnetic powder core prepared by a revamped process was studied through comparative experiments,and the corresponding physical mechanism was observed.Scanning electron microscopy,transmission electron microscopy and X-ray diffraction were used to characterize the morphology,internal structure and lattice deformation of magnetic powders,B-H analyzer was used to characterize magnetic properties of magnetic powder core.The results showed that the revamped process could effectively reduce the loss of the magnetic powder core,and promote magnetic permeability and frequency range.The hysteresis loss and eddy current loss could be decreased by increasing milling time,and the optimum mil-ling time was 8 h.Our experiments found that the magnetic powders produced by the revamped process possess a relatively low lattice deformation,which means that the effective release of the remnant internal stress leads to the improve of magnetic powder core′s performance.
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