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首页> 外文期刊>Journal of magnetism and magnetic materials >Intergranular insulating reduced iron powder-carbonyl iron powder/SiO_2-Al_2O_3 soft magnetic composites with high saturation magnetic flux density and low core loss
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Intergranular insulating reduced iron powder-carbonyl iron powder/SiO_2-Al_2O_3 soft magnetic composites with high saturation magnetic flux density and low core loss

机译：高饱和磁通密度低铁损的晶间绝缘还原铁粉-羰基铁粉/ SiO_2-Al_2O_3软磁复合材料

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摘要

The soft magnetic composites (SMCs) with high saturation magnetic flux density (B-s) and low core loss (P-s) have great potential in power electronics. In this work, the insulating SiO2-Al2O3 layer was prepared by a hydrothermal method to coat on the surface of the carbonyl iron powders (CIPs). Then, the coated CIPs were heterogeneously distributed in the reduced iron powders (RIPs) to fabricate the intergranular insulated SMCs. The scanning electron microscope (SEM) images and elements analysis confirmed that the surface of the CIPs was covered by a thin insulating layer forming a core-shell structure, and the Si-O-Al bond was detected by FTIR spectra. The resulting samples were annealed at 450 degrees C in N-2 atmosphere to eliminate the residual stress and improve magnetic properties. The annealed.SMCs containing 25 wt% CIPs@SiO2-Al2O3 have optimum magnetic properties with a low P-s of 106.9 W/kg and a highly approximate B-s of 1.28 T (measured at 500 Hz). Compared with the conventional SMCs, the addition of the coated CIPs can suppress the adverse effect of the nonmagnetic coating layer on magnetic properties; meanwhile, the coated CIPs distributed in the RIPs can reduce the P-s. This work provides a promising approach to the development of SMCs with low hysteresis loss and optimum magnetic properties at low frequency.
机译：具有高饱和磁通密度（B-s）和低铁损（P-s）的软磁复合材料（SMC）在电力电子领域具有巨大潜力。在这项工作中，通过水热法制备绝缘的SiO2-Al2O3层，以涂覆在羰基铁粉（CIPs）的表面上。然后，将涂覆的CIPs异质分布在还原铁粉（RIPs）中以制造晶间绝缘SMC。扫描电子显微镜（SEM）图像和元素分析证实，CIP的表面被形成核-壳结构的薄绝缘层覆盖，并且通过FTIR光谱检测到Si-O-Al键。将所得样品在N-2气氛中在450摄氏度下退火，以消除残余应力并改善磁性能。含25％（重量）CIPs @ SiO2-Al2O3的退火SMC具有最佳的磁性，其P-s低至106.9 W / kg，B-s高至1.28 T（在500 Hz下测量）。与常规SMC相比，添加涂层的CIP可以抑制非磁性涂层对磁性的不利影响。同时，分布在RIP中的涂层CIP可以降低P-s。这项工作为开发具有低磁滞损耗和低频最佳磁性能的SMC提供了有希望的方法。

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