Temperature-insensitive microwave absorption of TiB2-Al_(2)O_(3)/MgAl_(2)O_(4) ceramics based on controllable electrical conductivity

作     者：LIU XiongZhang ZHANG Sealing LUO Hui CHEN Fu LI DongMeng WANG Xian GONG RongZhou LIU XiongZhang;ZHANG SenJing;LUO Hui;CHEN Fu;LI DongMeng;WANG Xian;GONG RongZhou

作者机构：School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China College of Mechanical and Electronic EngineeringNorthwest Agriculture and Forestry UniversityYangling 712100China School of Information Science and EngineeringWuhan University of Science and TechnologyWuhan 430081China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2021年第64卷第6期

页      面：1250-1263页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：the National Natural Science Foundation of China(Grant Nos.61701185 and 61801186) the Natural Science Foundation of Hubei Province(Grant Nos.2020CFB509 and2020CFB511) 

主　　题：titanium boride aluminium oxide magnesium-aluminate spinel high-temperature electrical conductivity temperatureinsensitive microwave absorption properties 

摘      要：The design of the high-temperature microwave absorbing materials (MAMs) with temperature-insensitive and considerable microwave absorption (MA) capacity is a tremendous *** B2-Al_(2)O_(3)/Mg Al_(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 *** results show that the Al_(2)O_(3) content is associated with flexural strength,high-temperature thermal stability,electrical conductivity,dielectric and MA ***,the temperatureinsensitive 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 Al_(2)O_(3) 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 ***,Ti B2-Al_(2)O_(3)/Mg Al_(2)O_(4) ceramics exhibit the ideal prospect as the high-temperature MAMs.