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Enhanced soft magnetic properties of iron powders through coating MnZn ferrite by one-step sol–gel synthesis
引用本文:刘冬,高善民,金仁成,王峰,初晓晓,高太平,王玉宝.Enhanced soft magnetic properties of iron powders through coating MnZn ferrite by one-step sol–gel synthesis[J].中国物理 B,2019(5):300-304.
作者姓名:刘冬  高善民  金仁成  王峰  初晓晓  高太平  王玉宝
基金项目:Project supported by the Natural Science Foundation of Shandong Province,China(Grant No.ZR2018MEM020)
摘    要:The MnZn ferrite coating formed on the surface of iron-based soft magnetic powders via facile and modified sol–gel process has been fabricated to obtain better magnetic performance due to its higher permeability compared with traditional nonmagnetic insulation coatings. The influence of the MnZn ferrite contents on the magnetic performance of the soft magnetic composites(SMCs) has been studied. As the MnZn insulation content increases, the core loss first experiences a decreasing trend that is followed by progressive increase, while the permeability follows an increasing trend and subsequently degrades. The optimized magnetic performance is achieved with 2.0 wt% MnZn ferrite, which results from the decrement of inter-particle eddy current losses based on loss separation. A uniform and compact coating layer composed of MnZn ferrite and oxides with an average thickness of 0.38 ± 0.08 μm is obtained by utilizing ion beam technology, and the interface between the powders and the coating shows satisfied adhesiveness compared with the sample directly prepared by mechanical mixing. The evolution of the coating layers during the calcination process has been presented based on careful analysis of the composition and microstructure.

关 键 词:soft  MAGNETIC  POWDERS  MAGNETIC  performance  COATING  layer  ion  beam  technology
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