In recent years, the development direction of structural absorbing materials mainly includes thermoplastic hybrid yarn absorbing composites, high temperature resistant structural composites and multilayer sandwich absorbing composites.
1. Thermoplastic hybrid yarn absorbing composites
After years of exploration by domestic and foreign research institutions, it is found that most of the non-metallic materials have excellent wave transmission properties, and their dielectric loss and dielectric constant are relatively low. Usually, the resins of PEEK, PEK and other materials are made into monofilament or multifilament, then mixed with other special fibers in a certain proportion, and then woven into three-dimensional grid material or light sandwich material. It has good absorbing and transmitting properties, and it has light weight, high strength and good plasticity. It can be used to manufacture aircraft fuselage, wing, missile shell and other parts.
2. High temperature structural microwave absorbing composites
With the progress and development of technology, the flying speed of aircraft is faster and faster, and the working temperature of some parts is also gradually increased. The working temperature of engine parts and missile front-end parts can be as high as 700-1000 ℃. The components under high-temperature condition have strong reflection on electromagnetic wave, which has become an important factor affecting the overall stealth performance of aircraft. When radar absorbing at such parts, it is necessary to have good performance of high temperature resistance and heat shock resistance. The traditional coating radar absorbing coating is far from meeting the practical needs. Therefore, the application of structural radar absorbing materials in these parts has a strong practical significance, and the structural radar absorbing composite materials can not increase the weight of the matrix, which is very important for aircraft 。
3. Multilayer sandwich absorbing composite materials
Sandwich structure absorbing composite material is a kind of sandwich structure absorbing material by adding core material between the panel and the bottom plate. At present, the core materials mainly used include honeycomb, corrugated structure or pyramid structure sandwich material. Compared with other kinds of absorbing materials, sandwich structure absorbing materials have many advantages, such as being able to broaden the absorption band, having strong designability and good mechanical properties.
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