Effect of Annealing on the Microwave-absorption Properties of Ni/Al2O3 Nanocomposites

doi:10.1007/s40195-013-0001-7

Abstract

Abstract:

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.

Key words: Microwave-absorption, Reflection loss, Microstructure

Songning XU, Meixing ZHAO, Zongqi CAI, Naikun SUN, Feng LIU, Baosheng DU, Xueyuan ZHANG,Zhoujun LING. Effect of Annealing on the Microwave-absorption Properties of Ni/Al₂O₃ Nanocomposites[J]. Acta Metallurgica Sinica (English Letters), 2013, 26(4): 385-389.

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Effect of Annealing on the Microwave-absorption Properties of Ni/Al₂O₃ Nanocomposites

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