Every once in a while, there will be new scientific breakthroughs that will change the world. According to an information disclosed by Haydale in the United Kingdom, a patented functionalized graphene conductive reinforcing filler developed by Haydale will be used. The conductive reinforced filler is added to the functionalized nanoparticles, and finally used for the preparation of prepregs, thereby forming a new type of functionally integrated part. The technical director of Haydale said that this patented functionalized graphene conductive reinforced filler The stealth capabilities of aircraft are greatly enhanced, or it will bring revolutionary changes in the research process of stealth technology or absorbing materials.
The main purpose of radar stealth is to reduce the aircraft's radar cross section (RCS). The main measures usually include: a unique aerodynamic shape design, that is, through a special shape design to control the direction of the radar echo, the use of absorbing materials and absorbing structures that can absorb radar waves, so that the scattered field is weakened, and no effective return is formed. Wave signal.
Absorbing materials can also be divided into two types in terms of material composition, one is a coating type absorbing material, and the other is a structured absorbing stealth material.
Coating type wave absorbing material is made by adding wave absorbing agent to resin base or rubber base. This wave absorbing material can be applied by brushing or spraying, and is suitable for complex curved shapes. However, this kind of coated material has the problem of weather resistance. Because it is attached to the surface of the aircraft, the surface adhesion gradually decreases with the age of use and the climate changes, and even falls off.
Structural absorbing materials are usually made of resin/fiber-reinforced composite materials and added absorbents. It is a multifunctional composite material that can not only be used as a structural component, has the advantages of light weight and high strength, but also can absorb or transmit electromagnetic waves better. It has become an important development direction of current stealth materials.
Coating type wave absorbing material is made by adding wave absorbing agent to resin base or rubber base. This wave absorbing material can be applied by brushing or spraying, and is suitable for complex curved shapes. However, this kind of coated material has the problem of weather resistance. Because it is attached to the surface of the aircraft, the surface adhesion gradually decreases with the age of use and the climate changes, and even falls off.
Structural absorbing materials are usually made of resin/fiber-reinforced composite materials and added absorbents. It is a multifunctional composite material that can not only be used as a structural component, has the advantages of light weight and high strength, but also can absorb or transmit electromagnetic waves better. It has become an important development direction of current stealth materials.
The rapid development of composite materials provides a guarantee for the development of structural absorbing materials. The new thermoplastic PEEK, PES, PPS and thermosetting epoxy resin, bismaleimide, polyimide, polyetherimide and isocyanate, etc. have relatively good dielectric properties, and composite materials made of them It has good radar transmission and transmittance. In recent years, scientists have done a lot of improvement work on carbon fiber, such as changing the cross-sectional shape and size of carbon fiber, surface treatment of carbon fiber surface, so as to improve the electromagnetic properties of carbon fiber, etc., for use in absorbing structure.
Scientists have discovered that radar works in the microwave frequency range and can be absorbed by multi-walled nanotubes (MWNT). Applying MWNT to aircraft will cause the radar to be absorbed, so it has a smaller radar cross section. According to scientific arguments, carbon nanotubes are used as stealth technology for aircraft. It was discovered that apart from absorbing the characteristics of radar, nanotubes neither reflect nor scatter visible light, making them basically invisible at night, which is very similar to the current stealth technology. The plane is painted black, but the effect is better. However, the current manufacturing restrictions mean that the production of nanotube-coated aircraft is impossible. In addition, after research at home and abroad, the absorption performance of carbon nano is limited by the intrinsic structure, and it is difficult to achieve broadband stealth effects. The adjusted molecular structure and energy band gap have great potential.
Scientists have discovered that radar works in the microwave frequency range and can be absorbed by multi-walled nanotubes (MWNT). Applying MWNT to aircraft will cause the radar to be absorbed, so it has a smaller radar cross section. According to scientific arguments, carbon nanotubes are used as stealth technology for aircraft. It was discovered that apart from absorbing the characteristics of radar, nanotubes neither reflect nor scatter visible light, making them basically invisible at night, which is very similar to the current stealth technology. The plane is painted black, but the effect is better. However, the current manufacturing restrictions mean that the production of nanotube-coated aircraft is impossible. In addition, after research at home and abroad, the absorption performance of carbon nano is limited by the intrinsic structure, and it is difficult to achieve broadband stealth effects. The adjusted molecular structure and energy band gap have great potential.
