内部润滑剂对铁硅铝磁粉芯性能的影响

Effects of internal lubricants on the properties of Fe-Si-Al magnetic powder cores

以合成蜡粉作为内部润滑剂制备铁硅铝磁粉芯,考察了蜡粉添加量及粒度对铁硅铝磁粉芯性能的影响。结果表明,蜡粉会降低铁硅铝磁粉芯的生坯密度、磁导率和磁芯损耗;蜡粉粒度越细,则生坯密度和磁导率的降低幅度越小,而磁芯损耗的降低幅度越大。在添加0.4 wt%磷酸的绝缘粉中添加1.4%的–300^+400目蜡粉,制得磁导率91.5、磁芯损耗600 mW/cm3、直流偏置性能为23.1 Oe(@80%L)和56.2 Oe(@50%L)的铁硅铝磁粉芯。

The Fe-Si-Al magnetic powder cores were prepared by using the synthetic wax powder(hereinafter referred to as wax powder)as an internal lubricant.The effects of the wax powder content and the particle size on the properties of the Fe-Si-Al magnetic powder core were investigated.The results show that the wax powder reduces the green density,permeability and core loss of the Fe-Si-Al magnetic powder core.The finer the wax powder was,the lower the reduction of green density and the permeability were,and the greater the reduction of the core loss was.By adding 1.4%of the–300^+400 mesh wax powder into the insulating powder A,the Fe-Si-Al magnetic powder core with permeability of 91.2,core loss of 600 mW/cm3,DC bias 23.1 Oe@80%L and 56.2 Oe@50%L was prepared.