Zhu Zhengqu, Liu Jiaqi, Zhao Huan, Pang Jing, Wang Pu, Zhang Jiaquan
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Qingdao Yunlu Advanced Materials Technology Co., Ltd., Qingdao 266232, China.
Materials (Basel). 2023 Feb 2;16(3):1270. doi: 10.3390/ma16031270.
FeSiAl is a commonly used soft magnetic material because of its high resistivity, low core loss, and low cost. In order to systematically study the effect of epoxy resin (EP) on the insulated coating and pressing effect of FeSiAl magnetic powders, six groups of composite powders and their corresponding soft magnetic powder cores (SMPCs) were prepared by changing the content of EP, and the soft magnetic properties of the powders and SMPCs were characterized. The results showed that FeSiAl powders exhibited good sphericity and morphology. The of FeSiAl/EP composite powders was between 117.4-124.8 emu·g after adding (0.3, 0.5, 0.7, 1, 1.5, and 2 wt. %) EP. The permeability of SMPCs increased first and then decreased with the increase in EP content. Among them, when the EP content was 1 wt. %, the corresponding SMPCs had the highest and excellent DC bias performance (63%, 100 Oe). In the whole test frequency range (501000 kHz), SMPCs with 1 wt. % EP content had the lowest core loss (1733.9 mW·cm at 20 mT and 1000 kHz). After that, the loss separation study in the low-frequency range (50250 kHz) was conducted, and the hysteresis loss and eddy current loss of SMPCs with 1 wt. % EP content were also the lowest. In addition, SMPCs also exhibited the best overall performance when the EP content was 1 wt. %. The results of this study can guide the design of composite insulation coating schemes and promote the development of soft magnetic materials for medium and high frequency applications.
铁硅铝因其高电阻率、低磁芯损耗和低成本而成为常用的软磁材料。为了系统研究环氧树脂（EP）对铁硅铝磁粉绝缘涂层及压制效果的影响，通过改变EP含量制备了六组复合粉末及其相应的软磁粉芯（SMPC），并对粉末和SMPC的软磁性能进行了表征。结果表明，铁硅铝粉末呈现出良好的球形度和形貌。添加（0.3、0.5、0.7、1、1.5和2 wt.%）EP后，铁硅铝/EP复合粉末的比磁化强度在117.4 - 124.8 emu·g之间。SMPC的磁导率随EP含量增加先增大后减小。其中，当EP含量为1 wt.%时，相应的SMPC具有最高的磁导率和优异的直流偏置性能（63%，100 Oe）。在整个测试频率范围（501000 kHz）内，EP含量为1 wt.%的SMPC具有最低的磁芯损耗（在20 mT和1000 kHz时为1733.9 mW·cm）。之后，进行了低频范围（50250 kHz）的损耗分离研究，EP含量为1 wt.%的SMPC的磁滞损耗和涡流损耗也是最低的。此外，当EP含量为1 wt.%时，SMPC还表现出最佳的综合性能。本研究结果可指导复合绝缘涂层方案的设计，促进中高频应用软磁材料的发展。
