Effect of annealing on the microwave-absorption properties of Ni/Al2O3 nanocomposites

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• 作者：Songning Xu (11)
  Meixing Zhao (11)
  Zongqi Cai (11)
  Naikun Sun (11)
  Feng Liu (11)
  Baosheng Du (11)
  Xueyuan Zhang (11)
  Zhoujun Ling (11)
  
• 关键词：Microwave ; absorption ; Reflection loss ; Microstructure
• 刊名：Acta Metallurgica Sinica (English Letters)
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：26
• 期：4
• 页码：385-389
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• 作者单位：Songning Xu (11)
  Meixing Zhao (11)
  Zongqi Cai (11)
  Naikun Sun (11)
  Feng Liu (11)
  Baosheng Du (11)
  Xueyuan Zhang (11)
  Zhoujun Ling (11)
  
  11. School of Science, Shenyang Ligong University, Shenyang, 110159, China
  
• ISSN：2194-1289

文摘

Ni/Al2O3 nanocomposites were prepared by the mechanochemical synthesis method. The annealing process enlarges the grain size of both the metal Ni and insulating Al2O3 in the as-milled nanocomposite and leads to an increase of the saturation magnetization and a decrease of the surface anisotropy. An optimal reflection loss (RL) of ?3 dB is obtained in the as-milled nanocomposite at 17.8 GHz for an absorber thickness of 6.6 mm. The annealed sample exhibits a RL exceeding ?0 dB in the whole K u-band for an absorber thickness of 6.6-.7 mm with an optimal RL of ?4.7 dB at 13.2 GHz for a layer thickness of 9.3 mm. The excellent microwave-absorption properties are a consequence of a proper match of the dielectric and magnetic losses.