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.