MnZn铁氧体/FeSiAl粉末复合体磁芯的制备及其高频EMI抑制性能

Fabrication and high frequency EMI suppression property of MnZn Ferrite/FeSiAl powder composite magnetic core materials

    摘要
  • 摘要: 介绍了MnZn铁氧体/FeSiAl粉末复合体磁芯的设计思路和制备过程,并研究了复合体磁芯的高频EMI抑制性能。首先分析了两种材料的高频EMI的抑制机理并完成了复合体磁芯制备工艺的设计,然后介绍了MnZn铁氧体/FeSiAl复合体磁芯的制备过程,详细分析了复合体磁芯的Fe-SiAl粉末氧化膜包覆和内部相间反应的关键工艺,并对不同工艺制备的磁芯磁损耗性能进行对比测试和分析。试验结果表明:FeSiAl粉末通过氧化膜包覆工艺后烧结成型制备磁芯高频EMI抑制性能较好,在频率范围为1～1.8GHz磁导率虚部都保持了较高的数值(平均值9.98),最高值达13.33;另外通过氧化膜包覆工艺处理后FeSiAl粉末和MnZn铁氧体混合,通过粘接压制方法制备的复合体磁芯,综合了两种材料的优点,高频EMI抑制性能较好(平均值8.64),而通过烧结制备的复合体磁芯,由于内部相间反应不易控制,造成EMI抑制性能下降。

     

    Abstract: A study on the effect of MnZn Ferrite/FeSiAl powder composite core materials on the suppression property of high frequency EMI was carried out.The suppression mechanism of high frequency EMI of the composite materials was analyzed and the course how to prepare the core was designed and introduced.The key processes of FeSiAl was analyzed and the magnetic loss characters of cores were compared and analyzed.The experimental results show that the core made of external oxidation powder is obviously improved in EMI suppression performance,the average value of μ″ is 9.98 in the frequent range between 1GHz and 1.8GHz and the maximum value is 13.33,In addition,the performance of composite cores made by bonding in high-frequency EMI suppression is better（the average value of μ″ is 8.64）.Instead composite cores prepared by sintering degrade in EMI suppression performance because internal oxidation reaction is not easy to control.

     

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