Research progress of alumina-based absorbing materials

Radar absorbing materials (RAM) play an important role in the defense field. Thin, light mass, broad bandwidth, and strong absorption are required for the RAM in current research filed. Weapons and equipment flying at high Mach make the local temperature of the body very high due to air resistance, and the absorbing materials at room temperature can not be applied. It is urgent to study the absorbing materials which can resist high temperature and absorb electromagnetic wave efficiently. High temperature resistant and high temperature absorbing materials prepared by composite of different types of absorbents with alumina as the matrix have been widely concerned and studied. The metal (alloy)/alumina, non-metal/aluminum, and other alumina-containing composite absorbing material systems are deeply discussed, and the current research status of alumina-based composites are systematically summarized in this paper. The structure, properties and absorption mechanism of composite absorbers prepared by different struc