8results about How to "Improve infrared stealth performance" patented technology

The invention discloses a functional polystyrene infrared stealth thin film material and a preparation method thereof, and belongs to the technical field of functional material preparation. The infrared stealth thin film material of the functionalized polystyrene is prepared from the following components in parts by weight: 53 to 67 parts of a substrate thin film material, 8 to 12 parts of modified polystyrene and 0.8 to 1.3 parts of an adhesive, the substrate thin film material is prepared from m-iodoaniline, trimethylsilylacetylene, diisopropyl xanthate disulfide, tetramethylammonium hydroxide, polyvinylidene fluoride and polymethyl methacrylate, and the modified polystyrene is prepared from syringaldehyde, n-butyl bromide, 2, 2 '-dipyrrolyl methane, 2-thiopheneboronic acid and polystyrene cross-linked microspheres. The infrared stealth thin film material of the functionalized polystyrene prepared by the method has excellent stealth performance and mechanical performance.

The present invention relates to the field of functional fabrics, and provides a flame-retardant fabric with infrared shielding performance and a preparation method thereof. The fabric is prepared by a textile process from a blended yarn of a polyester composite fiber and a surface-modified polyimide composite fiber. The polyester composite fiber contains a magnesium hydroxide / zinc oxide composite filler, which is prepared by melt blending and spinning, and the surface-modified polyimide composite fiber is obtained by surface modification treatment of basic zinc carbonate. The zinc oxide particles and magnesium hydroxide nanowires in the magnesium hydroxide / zinc oxide composite filler act synergistically to enhance the flame retardancy and infrared shielding ability of the fiber; the use of surface-modified graphene improves the mechanical and thermal stability of the polyimide fiber. By reasonably regulating the fiber ratio and weaving density, the fabric has excellent mechanical properties, infrared shielding properties and flame retardant properties while ensuring flexibility, and has a wide range of application value.

This invention belongs to the field of radar absorbing materials technology, and discloses a continuous alumina fiber reinforced alumina-based structure radar absorbing material and its preparation method. The radar absorbing material includes a composite material body, a reflective layer disposed on the back of the composite material body, a frequency-selective surface layer disposed on the front of the composite material body, and at least two metamaterial layers embedded within the composite material body; the composite material body is a continuous alumina fiber reinforced alumina ceramic matrix composite material with a density of 2.8~3.0 g / cm³. 3 The reflective layer is a continuous conductive layer; the frequency-selective surface layer is a discontinuous conductive layer composed of periodically arranged conductive patterns; the metamaterial layer is located between the reflective layer and the frequency-selective surface layer and has a periodic resistance pattern. This improves the operating temperature and mechanical properties, reduces the material thickness, and achieves wide-band absorption, with an infrared emissivity of no more than 0.3 in the 3~5μm band, thus enhancing infrared stealth capabilities.

The invention discloses an infrared stealth film material of functionalized polystyrene and a preparation method thereof, and belongs to the technical field of functional material preparation. The infrared stealth film material of functionalized polystyrene is composed of the following components in parts by weight: 53-67 parts of a base film material, 8-12 parts of modified polystyrene, and 0.8-1.3 parts of an adhesive, wherein the base film material is prepared from meta-iodoaniline, trimethylsilyl acetylene, diisopropyl xanthate disulfide, tetramethylammonium hydroxide, polyvinylidene fluoride, and polymethyl methacrylate, and the modified polystyrene is prepared from syringaldehyde, n-butyl bromide, 2,2'-dipyrrolyl methane, 2-thiophene boric acid, and polystyrene cross-linked microspheres. The infrared stealth film material of functionalized polystyrene prepared by the method has excellent stealth performance and mechanical properties.

The invention relates to the technical field of camouflage stealth equipment, and discloses a multiband compatible stealth system. The stealth system comprises a honeycomb wave-absorbing layer, a flame-retardant layer, a sponge layer, a photonic crystal layer and a visible light coating which are sequentially stacked together from the bottom layer to the surface layer. The flame-retardant layer is coated on the upper surface of the honeycomb wave-absorbing layer; the sponge layer is in equal-area fit with the flame-retardant layer by using a heat sealing process; the photonic crystal layer comprises base cloth and a photonic crystal coating electroplated on the surface of the base cloth, and the base cloth is attached to the sponge layer in an equal-area mode through a heat sealing technology; and the visible light coating is coated on the surface of the photonic crystal plating layer. The infrared-radar-laser compatible stealth camouflage function is achieved through the characteristics of low emissivity and high transmittance of the photonic crystal material, meanwhile, the light high-strength sponge material is loaded, the characteristics of a target heat source part are restrained, the infrared stealth function is enhanced, and in addition, on the premise that a low-emissivity metal material is not adopted, the infrared stealth function is achieved. The adverse effect of metal materials on color matching can be effectively avoided, and visible light compatibility is achieved.

The invention belongs to the field of material preparation, and discloses a preparation method and application of a titanium carbide film with high electromagnetic shielding and infrared stealth performance, and the preparation method comprises the following steps: forming a titanium carbide MXene film on a substrate through vacuum filtration, carrying out isotropic stretching on the titanium carbide MXene film and the substrate while carrying out steam treatment, and then removing the substrate to obtain the titanium carbide film with high electromagnetic shielding and infrared stealth performance. The titanium carbide film with high electromagnetic shielding and infrared stealth performance is prepared; the steam adopted in the steam treatment is plasticizing steam, the plasticizing steam is formed by evaporating a plasticizing solvent which has a plasticizing effect on the titanium carbide MXene film, and the plasticizing solvent is water and / or ethanol; the prepared titanium carbide film with high electromagnetic shielding and infrared stealth performance can be applied to the surfaces of airplanes, ships and vehicles and protective clothing. According to the invention, wrinkles, wrinkles and other irregular forms of MXene sheet layers can be eliminated or reduced, accurate alignment and precise arrangement between the sheet layers are realized, and high densification and orientation optimization of inner and outer layers of the film are realized.

This invention discloses an aircraft with an integrated fluid thrust vectoring nozzle and wing, comprising an integrated airfoil, an engine, an engine exhaust nozzle, and a fluid thrust vectoring nozzle; the engine is embedded within the integrated airfoil, and the engine exhaust nozzle is pre-deflected upwards. This aircraft with an integrated fluid thrust vectoring nozzle and wing effectively reduces the thickness of the wing's trailing edge, thereby reducing aft drag during flight; it is lightweight, has fewer moving parts, and exhibits fast deflection response, providing controllable pitching moment within the aircraft's cruise angle of attack; it improves the lift coefficient and control moment; and it enhances the aircraft's infrared stealth performance.

The invention relates to an MXene / vanadium dioxide / melamine foam composite material as well as a preparation method and application thereof. Compared with a foam infrared stealth material synthesized by an existing method, the MXene / vanadium dioxide / melamine foam composite material prepared by the method disclosed by the invention has very excellent infrared stealth performance, and has phase change particles, so that the infrared emissivity of the foam composite material can be controlled through temperature change; the MXene / vanadium dioxide / melamine foam composite material with adjustable infrared stealth performance is prepared, and a detected object can be protected from being found by an infrared detector in a complex temperature environment. The adjustable infrared stealth material prepared by the method disclosed by the invention is beneficial to expanding the application of a foam composite material in the fields of infrared stealth, high-quality and advanced national defense military industry and the like. The MXene / vanadium dioxide / melamine foam composite material prepared by the invention is in a foam shape and is light in weight and high in strength. The method can be applied to the field of controllable infrared stealth and heat storage.