YAN Yao, ZHANG Sifan, YUAN Ningkai, JIA Xu, LIU Yi
(Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China)

Abstract: TiC has excellent physical and chemical properties which can be used as microwave absorbing materials in special conditions. However, it has disadvantages such as single absorbing mechanism and poor impedance matching performance, while the morphology of TiC has a significant effect on its microwave absorption performance. Microcrystalline graphite, carbon fiber and cornstarch were selected as carbon source to prepare film-like, rod-like and porous TiC in high-temperature molten salt. Microwave absorbing properties in the frequency range of 2–18 GHz were systematically studied. It is found that the TiC powders will all three morphologies have promising microwave absorption performance. Among them, the TiC made from cornstarch has higher absorption performance due to its porous structure, which is conducive to the formation of conductive networks. At a thickness of 2.30 mm, the lowest reflection loss is −62.71 dB. By adjusting the thickness to 2.10 mm, the effective absorption bandwidth can reach 4.24 GHz.
Key words: microwave absorption; morphology control; TiC