4results about How to "Reduce IR emissivity" patented technology

The invention discloses a double-sided wave-absorbing continuous alumina fiber reinforced alumina composite material compatible with infrared stealth and a preparation method thereof, and belongs to the technical field of stealth materials. According to the double-sided wave-absorbing continuous alumina fiber reinforced alumina composite material compatible with infrared stealth, on the premise that the strength of the continuous fiber alumina fiber reinforced alumina composite material is guaranteed, the relative dielectric constant of a composite material body is reduced by controlling the porosity (the density of the composite material); and the frequency selective surface layer and the resistance type metamaterial layer are arranged, so that the thin double-sided wave-absorbing continuous fiber alumina fiber reinforced alumina composite material is obtained, and meanwhile, the material has relatively low infrared emissivity.

A photothermal converter based on a hemispherical Bi₂Se₃ superstructure belongs to the field of solar energy technology and applications. The stacked structure from bottom to top consists of: a metal substrate, a silica microsphere mask layer, and a Bi₂Se₃ thin film layer. The metal substrate is made of materials such as titanium and has a thickness greater than the skin depth (≥100 nm). The silica microsphere mask layer forms a close-packed array through self-assembly, with microspheres having a diameter of 200 nm. The Bi₂Se₃ thin film is prepared through conformal deposition, with a thickness ranging from several nanometers to hundreds of nanometers. This device utilizes the bulk-surface state synergistic effect of the topological insulator Bi₂Se₃, combined with Mie resonance excited by a hemispherical superstructure and plasmon coupling, to achieve an average high absorption rate of 97% in the 0.3–2.5 μm band and an emissivity as low as 0.07 in the 2.5–25 μm band. It exhibits stable absorption characteristics over a wide incident angle (0°–60°) and can be prepared in a low-cost and controllable manner through self-assembled microsphere masks and magnetron sputtering technology, providing a feasible solution for high-performance solar thermal conversion systems.

The present application relates to a kind of thermochromic multiband compatible infrared stealth film and its preparation method and application, belong to infrared stealth film technical field.To solve the problems of existing infrared stealth material preparation process complex, high cost, narrow application, the present application provides a kind of thermochromic multiband compatible infrared stealth film, from top to bottom in turn for ZnS material layer, VO2 Material layer, Si material layer and Ag substrate layer.The infrared stealth film of the present application has the characteristics that infrared emissivity decreases with temperature rise, can be reversibly adjusted according to the change of ambient temperature Film emissivity, with 3~5 μm and 8~14 μm dual infrared band stealth function, in non-infrared detection band 5~8 μm band has higher emissivity, can realize the heat dissipation function of stealth target in this band.The infrared stealth film of the present application has the characteristics of simple structure and convenient preparation method, and the film can be large-area covered on target surface, which is conducive to large-scale promotion.

The application belongs to the technical field of infrared camouflage materials, and particularly relates to a kind of imitated vegetation PAAS / PVA composite camouflage material based on transpiration and a preparation method thereof. The camouflage material is composed of a high-hygroscopic composite base material, a colorant, a metal pigment and a "bridging" material. The high-hygroscopic composite base material is composed of a hygroscopic inorganic substance and a hygroscopic polyacrylic acid sodium (PAAS) and polyvinyl alcohol (PVA) composite. The "bridging" material is a medium that plays a bridging role between colorants, between a colorant and a metal pigment, and between metal pigments. The composite camouflage material has low emissivity in the mid-infrared band, is highly regenerative and reversible, can be recycled and reused, has low preparation cost, high practicality and other characteristics, and can be used in the field of infrared camouflage for reducing the detectability of weapons and equipment.