由 FeSiAl/Fe3O4 核壳颗粒演化而来的 Fe3Si/Al2O3 软磁复合材料的超低颗粒间涡流损耗,Journal of Magnetism and Magnetic Materials

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由 FeSiAl/Fe3O4 核壳颗粒演化而来的 Fe3Si/Al2O3 软磁复合材料的超低颗粒间涡流损耗
Journal of Magnetism and Magnetic Materials ( IF 2.5 ) Pub Date : 2019-08-01 , DOI: 10.1016/j.jmmm.2019.04.027
Fan Luo , Xi'an Fan , Zigui Luo , Wentao Hu , Guangqiang Li , Yawei Li , Xin Liu , Jian Wang

摘要采用球磨涂层结合后续放电等离子烧结（SPS）工艺制备了FeSiAl/Fe3O4核壳复合颗粒和转化Fe3Si/Al2O3复合压块。系统地研究了Al2O3绝缘层的形成机制和Fe3Si/Al2O3复合压块的磁性能。FeSiAl 颗粒通过球磨法涂覆有均匀的 Fe3O4 纳米颗粒。在SPS过程中，由于FeSiAl合金芯与Fe3O4涂层之间的高温固相反应，形成了新相Fe3Si/Al2O3复合压块。Fe3Si 相具有优良的软磁性能，均匀的 Al2O3 层显示出良好的绝缘性。所以，Fe3Si/Al2O3 复合压块与原始的 FeSiAl 压块相比，表现出优异的软磁性能，如增强的饱和磁化强度、降低的矫顽力、良好的磁导率稳定性、高电阻率以及因此在高频下低铁损。本工作的研究结果表明，铁氧化物包覆的 FeSiAl 合金颗粒可以通过高温固相反应转化为具有新绝缘层的软磁复合材料，这为开发具有优异电学性能的新型软磁复合材料提供了一种有前景的途径。 -磁性。

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Ultra-low inter-particle eddy current loss of Fe3Si/Al2O3 soft magnetic composites evolved from FeSiAl/Fe3O4 core-shell particles

Abstract FeSiAl/Fe3O4 core-shell composite particles and transformed Fe3Si/Al2O3 composite compacts have been prepared via ball milling coating combined with subsequent spark plasma sintering (SPS) process. The formation mechanism of the Al2O3 insulating layer and the magnetic properties of the Fe3Si/Al2O3 composite compacts have been investigated systematically. The FeSiAl particles are coated with uniform Fe3O4 nanoparticles by ball milling method. And during SPS process, the new phase Fe3Si/Al2O3 composite compacts are formed due to the high temperature solid phase reaction between FeSiAl alloy core and Fe3O4 coatings. The Fe3Si phase possesses excellent soft magnetic properties and the uniform Al2O3 layer shows good insulativity. Therefore, the Fe3Si/Al2O3 composite compacts exhibit superior soft magnetic performance such as enhanced saturation magnetization, reduced coercivity, good permeability stability, high resistivity and thus low core loss at high frequency compared with the original FeSiAl compacts. The investigated results in this work indicate that FeSiAl alloy particles coated with iron oxides can be transformed into soft magnetic composite materials with new insulating layer via high temperature solid phase reaction, which provides a promising approach to develop new-style soft magnetic composites with excellent electro-magnetic properties.

更新日期：2019-08-01

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