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Research of Microwave Absorption Property of Iron-based Magnetic Alloy Powders

Author: CaoZuo
Tutor: GongRongZhou；FengZeKun
School: Huazhong University of Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Anti- electromagnetic interference material Fe-Si-Al based alloy Flattening process Coating process Reflection coefficient
CLC: TN04
Type: Master's thesis
Year: 2005
Downloads: 290
Quote: 3
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Abstract


In today's electronic age of information technology , with the rapid development of computers, mobile communications , satellite communications , the increasing influence of electromagnetic interference in the field of military and civilian electronic information . Communication speed at the same time , the clock pulse frequency is increased , more and more high- frequency electromagnetic interference followed . Order to suppress the leakage of electromagnetic wave of high frequency transmitter caused by the noise , there is a need to develop a high frequency loss is large electromagnetic wave absorbing material to efficiently absorb the noise energy . This paper briefly describes the electromagnetic wave absorption mechanism of anti - EMI material to discuss the performance of the absorption of electromagnetic waves of different materials . Higher than ferrite the metal magnetic saturation magnetic induction , high permeability in the microwave range , there is conducive to the realization of a thin layer of high frequency too ferrite materials the Snoek limit the reach , so you can use metal magnetic materials meet the requirements of the the GHz band anti-jamming devices . Meanwhile, the metal magnetic material Curie temperature oxidation problem , temperature stability than ferrite materials . Thus, in recent years , proposed the use of rubber or epoxy resin as a binder sendust - based soft magnetic alloy powder . In this paper, the flattening process and insulation coating process , sendust soft magnetic alloy powder modified process details two improved alloy micronized absorption properties . SEM analysis of the experimental samples , the observed particle morphology of the material properties . Summarizes the influence of different milling time , as well as the different insulating media content for the electromagnetic properties of the material . Analysis monolayer absorbing materials ( containing a conductive substrate) of the electromagnetic wave reflectivity formula to calculate the different samples reflectance results show that milling flattening process and an insulating coating process can effectively improve the microwave absorption properties of the sendust metal powder . Soft magnetic metal powder of the Department of Sendust modified 1.0-3.5GHz band has a good microwave absorbing properties , can be applied to anti- electromagnetic interference .

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