The concealed body function of the plane gets effective test and verify in numerous war, the viability that owns aircraft of concealed body function and dash forward prevented ability to get promoting substantially. It is with Yugoslavia war exemple, opportunity for combat of numerous concealed body dispatchs again and again, destroyed numerous target not only, and only also opportunity for combat of body of a concealed by down. Investigate its reason, the coating of exterior concealed body that basically depends on it and body of internal composition concealed can absorb radar wave effectively, former and main draw high frequency signal, latter basically draws low frequency signal, make the radar scattering area of the plane reduces minor rate, make the plane keeps away from thereby the lock-on of the other side, avoid by the risk of down.
Suck wave material to be able to be divided commonly it is two kinds big, it is coating is sucked wave, 2 it is the structure is sucked wave, carbon fiber belongs to a structure to suck in the application of this respect wave. Common carbon fiber is right the reflector of electromagnetic wave, do not have suck wave function, only the carbon fiber composite material of sectional carbon fiber and abnormity structure just has abnormity suck wave function, and use carbon fiber as when sucking wave material, need notes these a few respects all the more: 1, is in exterior modified carbon fiber deposit of carbon fiber surface bead of a poriferous carbon or adherent tiny ball of a poriferous carbon, in order to improve its electromagnetism performance, the suction with gift certain wave function. 2, microtherm carbonization carbon fiber carbon fiber of low temperature is temperature of the carbonization after pointing to under normal carbonization temperature, its purpose is adjusting control resistance. Carbonization temperature is higher, resistance is less, suck wave function to jump over difference. But, carbonization temperature is low, affect the tensile strength of carbon fiber and modular amount. Answer to consider integratedly, search can the beautiful carbonization temperature of quantity of rate of resistor of give attention to two or morethings, model and tensile strength. 3, lay up of the carbon fiber in the envelope of elaborate design of course of beehive structure and incident weaveform become proper point of view, gift its attract wave faculty certainly. Because electric field direction and fiber axial are parallel, the reflector of the radar wave of carbon fiber; When electric field direction and fiber axis direction perpendicular or inclined when making fiber axis way, while carbon fiber has particular rare function, magnetism loss and electric loss are added to inhale wave dose in the expanded plastics that installs inside beehive, the pink that be like carbon, ferrite, make incident radar wave is reflexed for many times, translate into heat energy and be absorbed. This kind of structure sucks wave material to be able to use production airframe, wing and machine first class. 4, the adjusting control of carbon fiber with sectional abnormity of test and verify its appearance and size, in order to be made so that a needed resistor and exterior resistor lead. In began this domestic and internationally to study the work. With the abnormity that Japanese Dong Li company develops sectional carbon fiber is exemple, the tensile strength of sectional carbon fiber can amount to the abnormity that makes 4.43GPa, tension model quantity is 245GPa, usable will make attract wave and the composite material member that bear the weight of. 5, jumbly suck wave structure to enhance fibrous resistor to lead change very big. Carbon fiber is a kind of good conductor, the dielectric of fibre glass, carborundum fibrous semiconductor, according to the design parameter of exterior resistor, according to certain proportion carbon fiber and fibre glass jumbly increase or carbon fiber and carborundum fiber jumbly increase, gift its suck wave function certainly. This kind is sucked wave suck wave attribute electric loss, magnetism loss should compare electric loss many strong. Carbon fiber serves as strategical new material, it is not just in spaceflight aviation domain, other if tank is armor material, maritime,the domain such as weapon of rocket of naval ships, missile has wide application, the crucial strategy material that still is a kind of national defence and national economy construction at the same time, it is each country develops new and high technology, national defence sophisticated technology and the corporeal base that transform traditional industry and technical forerunner, the technology has very important sense related composite material of positive development carbon fiber.
