High-temperature Wave-transparent Coating For Radome And Mechanism

Supersonic aircraft flying in the atmosphere, the aerodynamic heating is very serious, and even aircraft surface temperature can reach 2000℃. The instrument in the radome at this time is difficult to work correctly, so the development of a heat-resistant coating protection radome and its internal equipment, work at a lower temperature is necessary.epoxy resin and silicone resin has better high temperature melting properties. This project mainly uses nano-SiO₂, cyanate ester resin, magnesium hydroxide, organic phosphate, nano-SiC, nano-Si3N4, and aramid fibers and epoxy resin, silicone copolymerization modification, preparation of the project needs a high temperature composite wave-transparent coating.Study the mechanism of ablation to determine the high temperature coating of lacquer-based coating system composition; interpenetrating polymer network (IPN) is the current leading edge technology issues, the paper studied the mechanism of IPN, structure, and characterization of metastable phase diagram, preparation of silicone / epoxy IPN resin; study of silicone resins and epoxy curing systems and curing of the relaxation change theory and research of silicone / epoxy resin system; study Nano-materials surface effect, volume effect, quantum size effect, macroscopic quantum tunneling effect and the dispersion theory, and thus modification of nanomaterials; study the enhancement mechanism of enhancer coating paint system to determine the enhancer system.According to the above theory, Silicone resin and epoxy resin using modified to prepare a good high temperature performance and mechanical properties of coatings with IPN structure. Using cyanate ester resin modified coating system, preparation of high dielectric properties of the coating system Using nano-SiO₂ as coating curing system's crosslinking points.On this basis, adding to the system, flame retardant, reinforcing agent to further enhance the high temperature resistance coatings. Organic phosphate modified nano magnesium hydroxide flame retardant, flame retardant prepared by high-performance, added to the coating system in order to enhance the flame retardant coating; added nano-SiC and nano-Si3N4 to the coating, generate SiC-Si3N4 composite particles in high temperatures, composite particles and coating's free radicals formatted linked network, greatly enhance the performance of paints and coatings in high temperature; added aramid fibers to the coating system, so that IPN mixed with aramid fibers, and further promote cross-linking and flexibility of the coating to make the coating having high hardness and good flexibility. After a further modification of the coating system, paint system's I200 is 49.5s greatly increasing high temperature performance; coating's wave-rate is greater than 80% in 1-18GHz range; coating's dielectric constant in the 1-18GHz within less than 3 and dielectric loss in the majority of frequency range are less than 10-3; coating hardness 6H, flexibility is 1mm, adhesion to level. Coating of the basic requirements to achieve the project targets...