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Al含量對(duì)MnAl粉體微波吸收特性的影響
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廣西自然科學(xué)基金(2013GXNSFAA019295)；國(guó)家自然科學(xué)基金(51361007)


Effect of Al Content on Microwave Absorbing Properties of MnAl Powder
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    摘要:

    采用高能球磨和熱處理工藝制備了MnAl合金粉體，使用SEM、XRD和網(wǎng)絡(luò)矢量分析儀研究Al含量對(duì)MnAl合金粉體組織結(jié)構(gòu)和微波吸收特性的影響。結(jié)果表明：隨Al含量的增加，MnAl合金粉體中Al0.89Mn1.11、β-Mn和Al2Mn3含量降低、Al8Mn5含量升高，使粉體磁損耗和介電損耗增加、共振頻率向低頻移動(dòng)、吸收峰數(shù)增加。吸波層厚度為2.0 mm時(shí), Mn40Al60樣品在12.2 GHz頻率處有最大吸收峰，其反射率最小值為–26.5 dB，具有較好的頻寬效果。MnAl粉體對(duì)電磁波的吸波機(jī)理包括吸波涂層內(nèi)的損耗以及前后界面反射電磁波在前界面處的干涉損耗

    Abstract:

    The MnAl alloy powder was prepared by high-energy ball milling and heat treatment process. Effect of Al content on the microstructure and microwave absorbing properties of MnAl powder were investigated with the help of scanning electron microscope (SEM), X-ray diffraction (XRD) and network vector analyzer. The results show that with the increase of Al content, Al0.89Mn1.11, β-Mn and Al2Mn3 contents in MnAl alloy powder decrease while the Al8Mn5 content increases; as a result, the powder magnetic loss and dielectric loss increase, resonance frequency moves to the low frequency, and more absorption peaks appear. When absorbing layer thickness is 2.0 mm, the Mn40Al60 sample has a maximum absorption peak at 12.2 GHz frequency, the reflectivity minimum is –26.5 dB, showing a better bandwidth effect. MnAl powder absorbing mechanism of electromagnetic wave includes the electromagnetic loss in the inner of the absorber and the interference loss between the reflection waves from the back interface and the front interface

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林培豪,楊 濤,朱保華,潘順康,劉 燁. Al含量對(duì)MnAl粉體微波吸收特性的影響[J].稀有金屬材料與工程,2015,44(10):2449~2453.[Lin Peihao, Yang Tao, Zhu Baohua, Pan Shunkang, Liu Ye. Effect of Al Content on Microwave Absorbing Properties of MnAl Powder[J]. Rare Metal Materials and Engineering,2015,44(10):2449~2453.]
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  • 收稿日期:2014-10-15
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  • 在線發(fā)布日期: 2016-07-13
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