【摘 要】
：
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).Fur
【机 构】
：
School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430
论文部分内容阅读
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℃-700℃ 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-AlzO3/MgAl2O4 ceramics exhibit the ideal prospect as the high-temperature MAMs.
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