Effect of Annealing on the Microwave-absorption Properties of Ni/Al2O3 Nanocomposites
来源期刊：Acta Metallurgica Sinica2013年第4期
论文作者：Songning XU Meixing ZHAO Zongqi CAI Naikun SUN Feng LIU Baosheng DU Xueyuan ZHANG Zhoujun LING
文章页码：385 - 389
摘 要：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 23 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 20 dB in the whole K u-band for an absorber thickness of 6.6-9.7 mm with an optimal RL of 54.7 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.
Songning XU，Meixing ZHAO，Zongqi CAI，Naikun SUN，Feng LIU，Baosheng DU，Xueyuan ZHANG，Zhoujun LING
School of Science,Shenyang Ligong University
摘 要：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 23 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 20 dB in the whole K u-band for an absorber thickness of 6.6-9.7 mm with an optimal RL of 54.7 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.
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