Problems faced with high-temperature microwave absorbing materials

The problems in researches of high-temperature microwave absorbing materials are discussed. It is indicated that raising absorbance in high temperature has been the goal of researches of high-temperature microwave absorbing materials. The way to further increase the absorbance of high-temperature microwave absorbing materials is in-depth understanding the basic phenomenon and mechanisms of the response of various lattice defects in a material to microwave electromagnetic field. The designable ability of periodical structure microwave absorbing materials, including metamaterial, makes them potential good high-temperature microwave absorbing materials. Oxidation, chemical reaction, and diffusion are problems of research and application of high-temperature microwave absorbing material. As for high-temperature microwave absorbing coatings, bonding strength and thermal shocking resistance are also major problems. Since the measures that optimize the application properties of high-temperature microwave absorbing composites often decrease the microwave absorbance of the material, so comprehensive optimization of application properties and microwave absorbance is the most difficult problem to be solved with high-temperature microwave absorbing composites. Compared with materials with a similar application environment, high-temperature microwave absorbing materials have the same property-requirement for application, in addition to the requirement for good microwave absorbance at high temperatures. Therefore, high-temperature microwave absorbing materials have more degree of difficulty than materials with a similar application environment.