降低软磁铁硅铝磁粉芯损耗的研究

Study on Reducing Loss of Fe-Si-Al Soft Magnetic Powder Cores

为制备高性能的软磁铁硅铝磁粉芯，研究了降低铁硅铝磁粉芯损耗的方法．采用扫描电镜、金相显微镜、BH分析仪检测样品的内部结构、形貌、磁性能．研究结果表明，压制后的退火处理是降低铁硅铝磁粉芯损耗的关键，增加热处理温度能够有效地降低磁粉芯的涡流损耗和磁滞损耗，过高的热处理温度会增大涡流损耗，最佳的热处理温度区间为660-720℃；添加绝缘剂能够有效地提高磁粉芯的电阻，降低其涡流损耗，对磁滞损耗的影响不大；增大成型压力可降低铁硅铝磁粉芯的损耗和矫顽力，最佳的成型压力为1800MPa．

To prepare the high-performance Fe-Si-Al soft magnetic powder cores, how to reduce the loss of Fe-Si-Al magnetic powder cores was explored. SEM, metallographic microscope and B-H analyzer were used to characterize the interior structure, morphology and magnetic properties of samples. The results indicated that the annealing following compaction is crucial to reducing the loss of Fe-Si-Al powder cores, and increasing annealing temperature can effectively reduce both hysteresis loss and eddy current loss, but over-annealing temperature can increase eddy current loss. The range of optimal annealing temperature is 660- 720℃. Although adding insulating material into the powder can effectively reduce eddy current loss by increasing the resistance of powder core, it has small influence on hysteresis loss. Increasing shaping pressure can reduce the loss of the magnetic powder cores and coercive force, and the optimal shaping pressure is 1 800 MPa.