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Temperature-insensitive microwave absorption of TiB2-Al2O3/MgAl2O4 ceramics based on controllable electrical conductivity

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Abstract

The design of the high-temperature microwave absorbing materials (MAMs) with temperature-insensitive and considerable microwave absorption (MA) capacity is a tremendous challenge. TiB2-Al2O3/MgAl2O4 MAMs are prepared by the spark plasma sintering (SPS). Further, the influences of the Al2O3 content on the flexural strength, thermal stability, high-temperature electrical conductivity, dielectric and MA properties are discussed. The results show that the Al2O3 content is associated with flexural strength, high-temperature thermal stability, electrical conductivity, dielectric and MA properties. Meanwhile, the temperature-insensitive and considerable MA properties with the minimum reflection loss (RLmin) ranging from −19.4 to −14.3 dB and the effective absorption bandwidth (EAB, RL<−5 dB) of 3.19–3.55 GHz are attained at 25°C–700°C in 8.2–12.4 GHz as the Al2O3 content increases from 70.6 wt% to 80.6 wt%. This is ascribed to the compensating effect of the positive and negative temperature coefficient materials on the high-temperature electrical conductivity as well as the co-play of the dipolar and interfacial polarization at elevated temperatures. Consequently, TiB2-Al2O3/MgAl2O4 ceramics exhibit the ideal prospect as the high-temperature MAMs.

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Authors and Affiliations

  1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China

    XiongZhang Liu, DongMeng Li, Xian Wang & RongZhou Gong

  2. College of Mechanical and Electronic Engineering, Northwest Agriculture and Forestry University, Yangling, 712100, China

    SenJing Zhang

  3. School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, 430081, China

    Hui Luo & Fu Chen

Authors
  1. XiongZhang Liu
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  2. SenJing Zhang
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  3. Hui Luo
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  4. Fu Chen
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  5. DongMeng Li
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  6. Xian Wang
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  7. RongZhou Gong
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Correspondence to RongZhou Gong.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61701185 and 61801186), and the Natural Science Foundation of Hubei Province (Grant Nos. 2020CFB509 and 2020CFB511).

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Liu, X., Zhang, S., Luo, H. et al. Temperature-insensitive microwave absorption of TiB2-Al2O3/MgAl2O4 ceramics based on controllable electrical conductivity. Sci. China Technol. Sci. 64, 1250–1263 (2021). https://doi.org/10.1007/s11431-020-1776-3

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  • DOI: https://doi.org/10.1007/s11431-020-1776-3

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