26results 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 discloses a densified carbon nanotube film with low infrared emissivity and a preparation method thereof, and relates to the technical field of infrared stealth materials. The method comprises the following steps: firstly carrying out heat treatment on a carbon nanotube film in an inert atmosphere, and then putting the carbon nanotube film into an acid pickling solution for treatment, and dipping the pickled carbon nanotube film in chlorosulfonic acid, and heating to volatilize the chlorosulfonic acid to obtain the densified carbon nanotube film. The infrared emissivity of the prepared carbon nanotube film can be as low as 0.25 and is only 39% of the infrared emissivity value of an initial carbon nanotube film, so that the carbon nanotube film is expected to be applied to the field of infrared stealth.

The invention discloses a visible-infrared-radar band compatible stealth composite material as well as a preparation method and application thereof. The composite material comprises a braid layer, a wide-spectrum functional layer and a transparent medium layer, the braid layer comprises a plurality of fibers, and pores are formed between adjacent fibers; the material of the wide-spectrum functional layer comprises metal and / or nitride, and the thickness of the wide-spectrum functional layer is less than a preset thickness to form a discontinuous structure; the transparent dielectric layer covers the surface of the discontinuous structure and forms optical resonance with the discontinuous structure to generate structural color. The fiber structure of the braid layer is utilized to form the broadband spectrum functional layer with a discontinuous structure, and the broadband spectrum functional layer is matched with the dielectric layer to realize colorful structural colors in a visible light range; in the thermal infrared band, the effect of low infrared emissivity is achieved through the reflection effect of the resonant cavity; in a radar wave range, the discontinuous broadband spectrum functional layer cannot effectively reflect radar waves, so that the material has visible, infrared and radar multiband compatible stealth efficiency.

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 preparation method of a carbon cage-in-cage / carbon coated nickel composite material with infrared stealth performance, an obtained product and application. The preparation method comprises the following steps: preparing nickel microspheres; roasting the nickel microspheres and urea in an inert atmosphere to obtain an NC / Ni composite material; and the NC / Ni composite material is placed in diluted hydrochloric acid for acid etching, and the cage-in-cage / carbon-coated nickel composite material is obtained. The obtained composite material is of a carbon-coated nickel modified carbon micron cage-coated nano cage structure, the process is simple, the cage-in-cage structure of the carbon cage can be accurately controlled, the defect that nickel elementary substances are easy to agglomerate is effectively overcome, and the composite material has good conductivity, electromagnetic wave absorption performance and low infrared emissivity and can be applied to the field of electrochemistry. Wide application values are realized in the fields of infrared stealth, electromagnetic wave absorption and the like.

The invention discloses a magnetic alloy / aluminum oxide composite thermal spraying powder and a preparation method and application thereof. The preparation method of the magnetic alloy / aluminum oxide composite thermal spraying powder of the invention comprises the following steps: S1, SiO2 shell coating; S2, ZrO2 shell coating; S3, composite powder preparation. The present invention regulates the electromagnetic parameters of the magnetic alloy by coating with a ceramic phase material with low dielectric properties, thereby improving the impedance matching characteristics of the magnetic alloy; the thickness of the coating layer is regulated by multiple coatings to reduce the sedimentation rate of the magnetic alloy, so that the magnetic-dielectric component of the composite powder is evenly distributed; the density of the coating layer is regulated by multiple coatings to improve the oxidation resistance of the magnetic alloy; the infrared emissivity of the magnetic alloy powder is reduced by introducing multiple interfaces using different ceramic phase materials; and the performance of the corresponding composite powder and the high-temperature absorbing coating is improved by regulating the slurry ratio during the granulation process, solving the problems of high dielectric properties and poor impedance matching characteristics of commercial iron silicon aluminum (FSA) after atomization molding, high density and easy sedimentation during granulation, resulting in uneven granulation components, and easy oxidation during thermal spraying, and high infrared emissivity of the coating. At the same time, the preparation method of the present invention is simple in process operation and easy to carry out mass production.

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 discloses a preparation method of a hydrophobic electromagnetic shielding fabric with an infrared stealth function, which comprises the following steps: S1, ultrasonically impregnating and washing a fabric, soaking with an alkaline solution, washing and drying to obtain a pretreated fabric; s2, silver nitrate is reduced through a reducing agent, and an AgNWs aqueous solution is obtained; s3, the MAX phase material is etched, and an MXene dispersion liquid is obtained; s4, mixing the AgNWs aqueous solution with the MXene dispersion liquid, cutting the fabric into a disc, placing the disc on a vacuum suction flask, and performing vacuum suction filtration and drying to obtain MXene coated AgNW / fabric; and S5, spraying a hydrophobic material on the surface of the MXene coated AgNW / cotton fabric to obtain the hydrophobic MXene coated AgNW / cotton fabric. One-dimensional AgNWs and MXene nanosheets with two-dimensional structural characteristics are bridged, so that the conductivity of the fabric is improved, and the absorption and reflection characteristics of the fabric to infrared radiation are also influenced, and therefore, under the synergistic effect generated by combining the AgNWs and MXene, the fabric keeps light and has excellent infrared stealth and electromagnetic shielding performance at the same time.

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 invention discloses a hollow microsphere with low thermal conductivity and low emissivity as well as a preparation method and application of the hollow microsphere. The structure of the hollow microsphere comprises a hollow core, and a glass ball shell layer, a porous silicon oxide layer and a metal layer which are sequentially arranged from inside to outside, wherein the metal layer is composed of a plurality of metal areas which are physically isolated from one another. The hollow microsphere has low density, high mechanical stability, low thermal conductivity and low emissivity, and has good cooperative control capability of thermal conduction and thermal radiation heat transfer.

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 invention relates to a preparation method and application of a microwave absorption and low infrared emission multifunctional flexible device, in particular to a preparation method and application of a microwave absorption and low infrared emission multifunctional flexible device. The method comprises the following steps: 1, preparing carbonized melamine foam; 2, preparing a FeCo PBA precursor; 3, preparing FeCo PBA powder with a magnetoelectric double-loss hollow structure; 4, preparing a product I; and 5, preparing the multifunctional flexible FeCo PBA-MF device with microwave absorption and low infrared emission, the multifunctional flexible FeCo PBA-MF device has the characteristics of lightness, thinness, softness, good wave absorption performance, low infrared emissivity and the like, when the thickness of the FeCo PBA-MF device is 2.0 mm and the frequency is 10.77 GHz, the minimum reflection loss reaches-70.37 dB, the maximum effective wave absorption bandwidth reaches 4.21 GHz, the FeCo PBA-MF device shows excellent wave absorption performance, and in the aspect of infrared performance, the microwave absorption and low infrared emission functions of the FeCo PBA-MF device are greatly improved. And the minimum emissivity of the wave band of 8-12 microns is 0.5.

The invention discloses a heat-insulating hollow microsphere with a double-layer structure as well as a preparation method and application of the heat-insulating hollow microsphere. The heat-insulating hollow microsphere structurally comprises a hollow core, and a glass ball shell layer and a metal composite layer which are sequentially arranged from inside to outside, the metal composite layer is composed of a plurality of metal sulfide regions and metal particles doped among the metal sulfide regions; wherein in each metal sulfide region, the metal sulfide particles are gathered to form an internally hollow structure. The heat-insulating hollow microsphere has the properties of low density, high strength, low emissivity and low heat conductivity coefficient, and well solves the problem of cooperative regulation of low emissivity and low heat conductivity coefficient of the light high-strength hollow microsphere heat-insulating material.

The invention discloses an infrared / radar compatible stealth material with a fractal structure and a preparation method thereof, belonging to the field of infrared / radar compatible stealth materials, and used to solve the problem of compatible stealth of low-frequency band radar and infrared waves. The technical key points are a radar absorbing coating with a Sierpinski square blanket fractal structure, the radar absorbing coating comprising a substrate and an absorbing coating covered on the substrate, the absorbing coating forming the fractal structure; an infrared stealth layer with a Sierpinski square blanket fractal structure, the infrared stealth layer comprising an aluminum foil supersurface, the aluminum foil supersurface forming the fractal structure; the infrared stealth layer is arranged on the radar absorbing coating, the effect is to broaden the effective absorbing bandwidth of the material in the S-C band below -10dB, and reduce reflection loss and infrared emissivity.

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 light-transmitting flexible metamaterial absorber with low infrared emissivity, comprising a plurality of metamaterial absorber structural units distributed in a periodic array in a two-dimensional space; the metamaterial absorber structural unit comprises a low infrared emission plate and a microwave absorption plate; the microwave absorption plate comprises a transparent medium substrate layer, a transparent flat plate layer, a transparent medium substrate layer, and a transparent reflection layer from top to bottom; the four corners of the lower end face of the infrared emission plate are vertically fixedly connected to the four corners of the upper end face of the microwave absorption plate through four plastic columns in a one-to-one correspondence, so that the infrared emission plate and the microwave absorption plate are arranged in parallel and an air layer is left in the middle. The present invention uses optically transparent, lightweight and flexible polyvinyl chloride (PVC) and polyethylene terephthalate (PET) as substrates, making them very popular in practical engineering applications, and having practical applications of multifunctional stealth technology.

The invention relates to the technical field of multi-layer materials, and discloses a sunscreen heat insulation composite material and a preparation method thereof. The preparation method of the composite material comprises the following steps: mixing, melting and extruding a zinc oxide / copolyester composite material and polyethylene glycol terephthalate, hot-pressing to form a film to obtain an intermediate layer material, coating one side of the intermediate layer material with a surface layer material, and photocuring to obtain a surface layer / intermediate layer composite material; the preparation method comprises the following steps: stirring and mixing polyurethane acrylate, a heat insulation additive, maleic anhydride modified polyvinyl butyral, a reactive diluent, a photoinitiator and a solvent to obtain an adhesive layer material, coating one side, far away from a surface layer material, of a surface layer / middle layer composite material with the adhesive layer material, and drying to obtain the sunscreen heat insulation composite material. The composite material has excellent anti-ultraviolet performance and heat insulation performance, and good water resistance and bonding 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.

The invention belongs to the field of masterbatches, and in particular to an antistatic PE film masterbatch and a preparation method thereof. An antistatic PE film gray masterbatch comprises the following raw materials in parts by weight: 70-90 parts of PE carrier resin, 5-15 parts of antistatic agent, 1-5 parts of titanium dioxide, 3-5 parts of carbon black, and 1-5 parts of zinc stearate. The antistatic PE film gray masterbatch prepared by the invention has strong comprehensive performance, good antistatic performance, high heat resistance, good dispersibility, and good weather resistance and color difference performance.

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.