New generation radar absorbing coating conductive polymer absorbing material polycrystalline iron fiber absorbing material

Since the 1990s, research institutions in developed countries such as the United States, France, and Japan have been studyingConductive polymer materialsConduct research and apply it to aircraft, missiles, and other aircraft as a new generation radar absorbing coating.

Although conductive polymer absorbing materials have made great progress in recent years, their processing performance is poor and their application temperature range is also limited. Most of the current research is limited to the exploratory stage, and further research is needed on its specific absorption mechanism, which still has a long way to go before it can be applied in engineering.

Polycrystalline iron fiber absorbing materialPolycrystalline iron fiber refers to fibers including Fe, Ni, Co, and their alloys, and its absorption mechanism mainly includes eddy current loss, hysteresis loss, and dielectric loss. As an absorbent for coating type absorbing materials, it can reduce the density of the coating, broaden the absorption frequency band, and achieve many advantages such as better oblique incidence characteristics. Foreign research institutions have conducted earlier studies on the absorbing properties of polycrystalline iron fibers, but due to technological limitations, there are relatively few relevant literature. According to reliable sources, a French research institution has successfully developed a new type of polycrystalline iron fiber radar absorbing material, which has been successfully applied to missiles and re-entry vehicles of its national strategic defense forces.

Conductive polymer absorbing materialConductive polymers refer to a class of polymers with π - electron conjugated chains that have been chemically or electrochemically doped. The excited transition motion on the conjugated chains after doping can transfer charges, allowing the conductivity of conductive polymers to be adjusted between insulators, semiconductors, and metal bodies. Therefore, they are also known as "organic metals".
Conductive polymers have physical and chemical properties such as diverse structures, good processing performance, and controllable electromagnetic parameters. After years of research, conductive polymers have made significant progress in technological exploration and practical applications. In recent years, infrared detectors have been continuously installed on various types of weapons and equipment, and infrared stealth has become a research hotspot. Therefore, materials that can combine infrared stealth with good radar absorption performance have gradually become the direction of exploration for many research institutions.
However, in principle, infrared stealth materials have high reflectivity and low emissivity, while radar absorbing materials have low reflectivity and high absorption performance. The two have a direct conflict in their working principles. Conductive polymer materials exhibit extremely unique infrared absorption and reflection characteristics due to their high conductivity and certain metal like properties. Their infrared reflectivity is much lower than that of ordinary polymers. Therefore, conductive polymers can make significant progress in the integration of infrared absorption. Through multi-layer design, it is possible to achieve lightweight, wideband, and multispectral stealth functions.
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