成型压强对FeSiB磁粉芯磁性能的影响

Effect of compacting pressure on the magnetic properties of FeSiB magnetic core

磁粉芯作为软磁材料的新兴发展成果相较于传统软磁材料在电力电子方面有着巨大的应用潜力。本文以气雾化FeSiB磁粉末为原料,经过预处理、包覆、成型压制和退火处理等过程制备了FeSiB磁粉芯,并研究了不同成型压强对磁粉芯磁性能的影响。结果表明,经钝化处理后的FeSiB粉末相比于未钝化粉末具有更稳定、致密的表面包覆层,提高了磁粉芯的电阻率、降低了磁损耗。对比不同成型压强下磁粉芯的磁性能,得出随着压强的增加,磁粉芯的磁导率先增加后减小,且在较宽频率范围内有着稳定的频率特性,当成型压强为1400 MPa,f为100 kHz,Bm为50 mT时,磁粉芯表现出良好的软磁性能,其中磁导率为17.66,磁损耗为103.04 W/kg,Q值为64.34。

Magnetic powder core is the latest type of the soft magnetic composites with great potential for the application in power electronics.Its properties are not only related to its own composition and structure,but also have great influence on its properties,including powder treatment,coating process,molding pressure and annealing coefficient.In this paper,gas atomized FeSiB powder was used as raw material to investigate the effect of different compacting pressure on the properties of the prepared magnetic powder cores.The specific results obtained showed that the passivatedFeSiB powder had a stable and compact surface coating layer,and the resistance of the magnetic powder core was increased while the magnetic loss was reduced.Compared with the magnetic properties of the corescompacted under different pressures,it was concluded that with the increase of the pressure,the permeability of thecores first increased and then decreased.The magnetic powder core obtained good comprehensive magnetic properties under 1400 MPa molding pressure(100 kHz,50 mT),while the permeability was 17.66,the loss was 103.04 W/kg and the Q value was 64.34.