A series of challenges are impeding the development of high temperature electromagnetic (EM) wave absorbing materials in x band. In this study, to deal with this problem, a coating, (1-x).wtAl₂O₃∼x.wtTiC, is designed and prepared using plasma spraying technology. Its permittivity increases with temperature and TiC content, which endows it with a good EM impedance at high temperature. The coating possesses excellent EM absorbing performance at 800 ℃. When the x value equals 0.2 and thickness 1.6 mm, the coating exhibits an EAB of 3.45 GHz at 800℃, and a reflection loss lower than -8 dB in whole x band. The XRD result shows that only two phases exist in the coating. The SEM images illustrate that TiC is unevenly dispersed in Al₂O₃, causing loss of conductivity and interface polarization. The finding not only broadens the application of TiC-based materials but also indicates the promising future of this material system.

一系列挑战阻碍了x波段高温电磁（EM）吸波材料的开发。在这项研究中，来处理这个问题，一个涂层，（1-x）的.wtAl ₂ ö ₃ ~x.wtTiC，被设计和采用等离子喷涂技术制备。其介电常数随温度和TiC含量的增加而增加，这使其在高温下具有良好的EM阻抗。该涂层在800℃时具有优异的EM吸收性能。当x值等于0.2且厚度为1.6 mm时，涂层在800℃时的EAB为3.45 GHz，在整个x波段中的反射损耗均低于-8 dB。XRD结果表明在涂层中仅存在两相。SEM图像表明TiC不均匀地分散在Al ₂ O _3中，导致电导率和界面极化损失。这一发现不仅拓宽了基于TiC的材料的应用范围，而且表明了该材料系统的广阔前景。