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

The design of the high-temperature microwave absorbing materials (MAMs) with temperature-insensitive and considerable microwave absorption (MA) capacity is a tremendous challenge. TiB 2 -Al 2 O 3 /MgAl 2 O 4 MAMs are prepared by the spark plasma sintering (SPS). Further, the influences of the Al 2 O...

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Bibliographic Details
Published in:Science China. Technological sciences 2021-06, Vol.64 (6), p.1250-1263
Main Authors: Liu, XiongZhang, Zhang, SenJing, Luo, Hui, Chen, Fu, Li, DongMeng, Wang, Xian, Gong, RongZhou
Format: Article
Language:English
Subjects:
Aluminum oxide
Ceramics
Dielectric strength
Electrical resistivity
Engineering
Flexural strength
High temperature
Microwave absorption
Plasma sintering
Spark plasma sintering
Temperature
Thermal stability
Titanium diboride
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Summary:The design of the high-temperature microwave absorbing materials (MAMs) with temperature-insensitive and considerable microwave absorption (MA) capacity is a tremendous challenge. TiB 2 -Al 2 O 3 /MgAl 2 O 4 MAMs are prepared by the spark plasma sintering (SPS). Further, the influences of the Al 2 O 3 content on the flexural strength, thermal stability, high-temperature electrical conductivity, dielectric and MA properties are discussed. The results show that the Al 2 O 3 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 (RL min ) ranging from −19.4 to −14.3 dB and the effective absorption bandwidth (EAB, RL
ISSN:1674-7321
1869-1900
DOI:10.1007/s11431-020-1776-3