Fabrication and Microwave Absorbing Performance of Porous Al2O3 Ceramic With Double Loss of Electromagnetic Wave

1.School of Materials Science and Engineering,Chang'an University,Xi'an 710061;2.Engineering Research Center of Transportation Materials of Ministry of Education,Chang'an University,Xi'an 710061

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    Based on the high strength of flake Al2O3 ceramic interlocking structure,Al2O3 porous ceramics with high porosity and graphite were prepared, and Ni particles were prepared by in-situ reduction in the porous skeleton to form a lightweight double-loss ceramic-based absorbing material. The effects of reduction temperature on the composition, microstructure,element distribution and microwave absorption properties of porous absorbing materials were studied by XRD,FE-SEM and EDS. Results concluded the following.The results show that Ni on the framework can be completely reduced when the temperatures is up to 700 ℃. The composite with a double loss function is composed of an interlocking Al2O3 matrix with graphite flakes embedded in it and Ni particles on the surface of pores. As the thickness of the composite is 6.5 mm,the reflection loss (RLmin) value is 35.01 dB and the effective bandwidth (RL ≤10 dB) is 1.75 GHz.Microwave absorption can be attributed to the conductive network formed by graphite flakes between flaky Al2O3 grains,as well as to the good impedance matching and polarization effect caused by the Ni particle-matrix interface.

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  • Received:November 19,2021
  • Revised:September 18,2023
  • Adopted:April 06,2022
  • Online: October 24,2023
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