13results about How to "Reduce IR emissivity" patented technology

The utility model relates to a thermochromic intelligent dual-band infrared stealth film, and belongs to the technical field of infrared stealth films. In order to solve the problems that an existing infrared stealth material is complex in preparation process, high in cost and narrow in application range, the utility model provides a thermochromic intelligent dual-band infrared stealth film which sequentially comprises a ZnS material layer, a VO2 material layer, a Si material layer and an Ag substrate layer from top to bottom. The infrared stealth film disclosed by the utility model has the characteristic that the infrared emissivity is reduced along with the temperature rise, the emissivity of the film can be adaptively and reversibly adjusted according to the environment temperature change, the infrared stealth film has a stealth function of double infrared bands of 3-5 microns and 8-14 microns, and meanwhile, the infrared stealth film has relatively high emissivity in a non-infrared detection band of 5-8 microns, so that the infrared stealth effect is greatly improved. And the heat dissipation function of the stealth target in the wave band can be realized. The infrared stealth film disclosed by the utility model has the characteristics of simple structure and convenient preparation method, can cover the surface of a target in a large area, and is beneficial to large-scale popularization.

The invention relates to a black coating with adjustable infrared emissivity and a preparation method and application thereof, and belongs to the technical field of optical and infrared coatings, the black coating comprises a black filler, resin and flaky aluminum powder in a mass ratio of 1: (0.3-1.5): (0-2.2). The black coating provided by the invention is black in the visible light wave band and has high visible light absorptivity and low infrared emissivity, and the infrared wave emissivity of the coating and the temperature under infrared thermal imaging can be regulated and controlled by regulating the dosage ratio of the flaky aluminum powder to the black filler in the black coating; and the use requirements of three-dimensional visualization effects of the planar model in the visible light band and the infrared band in different regions, different seasons and different moments can be met.

The invention relates to the technical field of materials, discloses a preparation method and device of a visible-light-transparent metamaterial wave absorber, and solves the problems that an existing preparation method and device of the visible-light-transparent metamaterial wave absorber are narrow in wave absorbing bandwidth, poor in visible light transparency and difficult to achieve an infrared camouflage effect. The infrared stealth layer, the first PMMA layer, the microwave absorption layer, the second PMMA layer and the microwave reflection layer are combined and arranged by utilizing the visible light transparency characteristic of the indium tin oxide thin film and the polymethyl methacrylate or the polyvinyl chloride plate, the indium tin oxide with resistance loss is used as an absorbent, electromagnetic resonance loss is introduced, and meanwhile the resistance loss is increased; the adjustable resistance and patterning characteristics of the indium tin oxide are fully utilized, the duty ratio of the high-conductivity indium tin oxide thin film in the infrared stealth layer is improved, the infrared emissivity can be reduced, and the transparent indium tin oxide thin film with different surface resistivity is utilized to realize broadband strong absorption of visible light transparency and infrared disguise.

The invention discloses a carbon-doped hafnium nitride nanocrystalline film. The chemical formula of the carbon-doped hafnium nitride nanocrystalline film is HfCxN1-x, wherein the value of x ranges from 0.09 to 0.1. The invention also discloses a preparation method of the carbon-doped hafnium nitride nanocrystalline film, which adopts a magnetron co-sputtering method and specifically comprises the following steps: putting a pure hafnium target and a graphite target into a chamber, and vacuumizing to 4 * 10 <-4 > Pa; and continuously introducing nitrogen and argon into the chamber, controlling the sputtering current of the pure hafnium target and the graphite target, and depositing the HfCxN1-x film on the substrate. According to the invention, the C element is introduced into HfN, so that the hafnium carbonitride nanocrystalline film with extremely low infrared emissivity and excellent durability is prepared.

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 invention relates to a wearable visible and infrared dual-band stealth material and a preparation method thereof, which specifically comprises the following steps: using a double-pass porous material as a substrate, evaporating gold particles on the substrate material by electron beam evaporation to form a composite device of the substrate material and gold; placing the formed composite device in a reaction liquid to react, dissolving the substrate material in the reaction liquid, leaving a gold structure; depositing a high-temperature resistant metal oxide on one side where a gold column is set, and the deposition thickness is nanometer-scale. The obtained stealth material has dual stealth characteristics of visible and infrared through the localized plasmon effect between the gold particles, and at the same time, because of its large number of pores, it provides comfortable wearing characteristics.

The invention provides a camouflage paint film and a preparation method thereof, and relates to the technical field of functional paints.The method comprises the steps that 1, a green phthalocyanine compound, flaky aluminum powder and a diluent are mixed to be uniform, and a modified green functional pigment is obtained; (2) uniformly mixing the modified green functional pigment, a dispersing agent, resin, a defoaming agent, an anti-settling agent, a flatting agent and a curing agent to obtain a functional coating; and (3) spraying the functional coating to obtain the camouflage paint film. The disguise paint film prepared by the invention has the same color and spectrum as a typical vegetation background, and the functional paint film has the advantages of smooth surface, uniform color, low glossiness, low infrared emissivity and excellent mechanical properties.

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 invention belongs to the technical field of functional coatings, and particularly relates to a visible light and far infrared compatible camouflage coating as well as a preparation method and application thereof. The infrared emissivity of the camouflage coating is as low as 0.4, and the emissivity of slurries with different colors can be controlled by adjusting the content of the infrared low-emissivity slurry during preparation; the camouflage coating prepared by the invention has infrared emissivity at the wave band of 8-14 microns, the emissivity of a high-emissivity coating is 0.7-0.8, the emissivity of a medium-emissivity coating is 0.5-0.6, the emissivity of a low-emissivity coating is not greater than 0.35, and the emissivity gradient is not greater than 0.15; through inspection, camouflage spots of woodland type and desert type coatings can effectively segment the outer contour of an infrared thermogram of target equipment within a 24-hour period, so that the aim of visible light and infrared stealth is fulfilled.

The present invention discloses a method for preparing a low-cost, high-temperature-resistant, long-life thermal resistance coating and the prepared coating, including preparing a metal bonding layer on the surface of a high-temperature alloy substrate; using an electron beam physical vapor deposition process to prepare a ceramic inner layer with a "Z"-shaped structure on the surface of the obtained metal bonding layer; using an EB-PVD process to prepare a low infrared emissivity layer with a "Z"-shaped structure on the surface of the obtained ceramic inner layer. The coating prepared by the method of the present invention overcomes the problems of high emissivity, poor thermal cycle resistance, and high cost of the coating prepared by the above-mentioned prior art, has good stability above 1000°C, 3-5μm infrared emissivity as low as 0.3, 1000°C thermal conductivity as low as 0.8w / (m*k), and excellent thermal cycle performance and low cost.

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.

The present invention discloses a MXene / vanadium dioxide / polymethyl methacrylate composite material and a preparation method and application thereof. Vanadium dioxide and polymethyl methacrylate are dissolved in an organic solvent, and ultrasonic stirring is performed to obtain a vanadium dioxide / polymethyl methacrylate mixed dispersion; the vanadium dioxide / polymethyl methacrylate mixed dispersion is added dropwise to a MXene film, and the mixture is evenly coated by scraping, and the mixture is placed in an oven for drying, and the organic solvent is volatilized to obtain a MXene / vanadium dioxide / polymethyl methacrylate composite material. Compared with existing thin film actuation materials, the composite material of the present invention has a very fast response speed, a multi-path response mode, and a stable actuation capability. At the same time, the composite material of the present invention has infrared stealth performance, and can also achieve the effect of remotely controlling movement in complex and changeable scenes. The multi-response actuator prepared by the present invention helps to expand the application of composite composite materials in intelligent fields such as actuators and micro robots.