4results about How to "Improve infrared stealth performance" patented technology

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 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.