141 results about "Low emissivity" patented technology

The invention relates to a Janus flexible super fabric capable of dynamically regulating and controlling infrared emissivity as well as a preparation method and application of the Janus flexible super fabric, and belongs to the technical field of high-performance fiber products. In order to solve the problem that the existing fabric capable of dynamically regulating and controlling the infrared emissivity cannot realize stepless wide-range infrared reflectivity dynamic regulation and control, the invention provides a Janus flexible super fabric capable of dynamically regulating and controlling the infrared emissivity, which has a sandwich structure, the hydrophobic nanofiber thin film layer, the low-emissivity coating and the hydrophilic nanofiber thin film layer are sequentially arranged from bottom to top. An anti-gravity unidirectional carrier transfer channel is constructed through surface binding energy difference of hydrophilic-hydrophobic Janus porous fabrics on two sides, a hydrophilic low-emissivity coating with ultralow infrared emissivity and the Janus porous fabrics form a sandwich structure, dielectric constants are adjusted through continuous and reversible change of carrier content, and accordingly, the infrared emission performance of the fabric is improved, and the infrared emission performance of the fabric is improved. Stepless regulation and control of humidity response self-adaptive ultra-wide range infrared emissivity at normal temperature are realized.

The invention discloses a preparation method of an infrared and radar stealth fabric, which comprises the following steps: S1, ultrasonically impregnating a fabric, soaking with an alkaline solution, washing and drying to obtain a pretreated fabric; s2, mixing wave-absorbing powder with a coating adhesive, then adding a thickening agent, coating a fabric with the mixture, and drying the fabric to obtain a compound fabric; s3, the MAX phase material is etched, and an MXene dispersion liquid is obtained; and S4, coating the composite fabric with the coating adhesive, coating the composite fabric with the MXene dispersion liquid, drying the composite fabric, and repeatedly coating the composite fabric for 1-3 times to obtain the MXene / wave-absorbing powder / fabric. The radar stealth layer is formed by utilizing the wave-absorbing powder, meanwhile, MXene is coated after the polyurethane coating adhesive is coated, it is ensured that the MXene forms a stable and continuous film, the emissivity is reduced to achieve infrared stealth, it is avoided that the integrity of the MXene structure is damaged by traditional mixed coating, the infrared low emissivity and the radar wave absorbing performance are balanced by accurately controlling the using amount of the MXene, and the infrared stealth effect is improved. And high-performance infrared and radar dual-band stealth is realized.

The embodiment of the invention provides a sunshade curtain and a preparation method thereof and a vehicle, the sunshade curtain comprises a base cloth layer, a first functional layer and a second functional layer, the first functional layer and the second functional layer are located on the front face and the back face of the base cloth layer respectively, and the first functional layer comprises an optical enhancement layer, a weather-proof hot melting layer and an antifouling layer which are stacked in sequence; the second functional layer comprises 30 wt%-40 wt% of second film-forming resin, 30 wt%-60 wt% of second heat reflection filler, 0.5 wt%-1 wt% of a second dispersing agent, 0-5 wt% of color paste and 30 wt%-60 wt% of a second solvent. Through the second functional layer, the optical enhancement layer, the weather-proof hot melting layer and the antifouling layer which are stacked, the sunlight reflectivity can be improved, the temperature in the vehicle is reduced, the riding comfort is improved, and the service life of the vehicle is prolonged. And the second functional layer is in the parameter range of the scheme, so that the emissivity can be reduced, heat can be controlled to be radiated to the glass side, the head burning feeling of a driver and passengers is reduced, and the comfort in the vehicle is further improved.

The invention relates to a thin film antenna and solar wing integrated structure. A thermal control coating is adopted on the outer surface of a thin film antenna layer to realize temperature control on the outer side of an antenna; heat flow diffusion and temperature self-adjustment of a high heating device in the antenna are realized by adopting the high-heat-conductivity flexible patch and the energy storage patch; the mutual heat radiation influence between the thin film antenna layer and the solar cell layer is reduced by adopting a plurality of thermal control heat insulation layers; and the temperature influence of the solar cell layer on the structural frame and the thin film antenna layer is further reduced through the low-emissivity thin film layer and the heat insulation connecting device. Under different sun irradiation conditions, the film antenna ensures that internal devices work in a preset temperature range; the problems of local heating and heat dissipation of high-heating devices in dot matrix distribution in the thin film antenna are solved. When the solar cell layer works, the thermal radiation influence on the thin film antenna caused by temperature rise is reduced, and finally the thermal compatibility design of the thin film antenna and the solar wing is achieved.

The invention discloses an energy-saving dimming assembly and a manufacturing method, and relates to the technical field of building energy-saving facilities, and the energy-saving dimming assembly is sequentially provided with a first transparent layer, a second transparent layer, a third transparent layer and a fourth transparent layer from outside to inside, the temperature response functional layer comprises a mixture of at least two thermochromic high polymer materials and is configured to realize adjustment of light transmittance in a preset temperature interval; the second transparent layer is used for supporting the temperature response functional layer; and an optical regulation and control layer configured to have a low-radiation characteristic in a long-wave infrared region. According to the invention, the transmittance of visible light and infrared light of the window can be changed along with the change of temperature at 20-38 DEG C. Meanwhile, programmed adjustment of the corresponding temperature response interval can be achieved through temperature change; and the gradual change of the transmittance of visible light and infrared light can be regulated and controlled in a programmed manner through the temperature change, so that the effects of regulating the indoor brightness and temperature and protecting the visual comfort of a user are realized, and the aim of saving energy is fulfilled.

The application relates to a coated glass and a laminated glass, the coated glass comprising a first glass sheet and a low-emissivity stack arranged on at least one surface of the first glass sheet, the low-emissivity stack comprising at least one transparent conductive oxide layer and at least one visible light blocking layer, the at least one visible light blocking layer being arranged on a side of the at least one transparent conductive oxide layer away from the first glass sheet, the at least one visible light blocking layer having a total physical thickness greater than 10 nm; the first glass sheet having a visible light transmittance TL1, the coated glass having a visible light transmittance TL2, TL1 and TL2 satisfying TL2 / TL1<=0.4. The coated glass can ensure low emissivity and low visible light transmittance, realize low visible light reflectivity, and make the prepared laminated glass have neutral color and lower manufacturing cost.

The invention discloses a self-adaptive thermal management device of a shape memory Janus array structure, a preparation method of the self-adaptive thermal management device and application of the self-adaptive thermal management device in a deep space probe, and belongs to the technical field of self-adaptive thermal management. The problem that the heat dissipating capacity of a traditional radiation radiator with the single heat radiation characteristic cannot be adjusted is solved. The temperature response shape memory Janus array is adopted as a driver of the self-adaptive thermal management device, and switching of different thermal management modes under the condition of no external energy consumption is achieved. When the temperature is lower than the phase change temperature, the shape memory Janus array is in a pressed-down state, the low-emissivity coating coated on one side of the comb teeth is exposed, and the heat loss of infrared radiation is effectively inhibited by utilizing lower infrared emissivity. When the temperature is higher than the phase change temperature, the shape memory Janus array is in an inclined state, and the high-emissivity coating coated on the other side of the comb teeth is exposed, so that energy increase caused by solar radiation is prevented, and effective heat release is promoted.

A display device includes a first type heat dissipation layer having a high emissivity disposed on a lower surface of a display panel, an upper surface of an inner plate and / or a lower surface of the inner plate facing to a lower frame, and a second type heat dissipation layer having a lower emissivity disposed on the lower surface of the inner plate corresponding to a driving circuit board. The heat generated in the display panel can be efficiently dissipated to an outside and heat generated in the driving circuit board can be transferred to the display panel in a minimized form.

The utility model relates to building energy -saving technical field solves the problem that traditional hollow glass depends on air layer heat insulation, but the heat conductivity coefficient is higher, and the energy -conserving effect is limited, and low emissivity coated glass needs to cooperate inert gas filling, and the process is complex and the durability is insufficient. Specifically, a glass heat insulation assembly, including outer glass, the front of outer glass is equipped with the snap -groove, the inside of snap -groove is provided with first adhesive layer, the front of first adhesive layer is provided with heat insulation assembly, the front of heat insulation assembly is provided with second adhesive layer, heat insulation assembly includes fixedly connected in first adhesive layer target flexible heat insulation core layer, the front of flexible heat insulation core layer is fixedly connected with reflection film layer, the front of second adhesive layer is fixedly installed with toughened glass, the outer surface of second adhesive layer is fixedly connected with first elastic heat conduction adhesive tape, the edge of outer glass is fixedly connected with second elastic heat conduction adhesive tape, and second elastic heat conduction adhesive tape is used for the edge of outer glass seal.

The invention relates to the technical field of textile materials, in particular to a thermal imaging and far infrared prevention fabric and a preparation method thereof.The fabric comprises a three-layer structure, the first layer is a base material bottom layer, the second layer is a reinforcing framework layer, and the third layer is a low-emissivity surface layer; the base material bottom layer comprises modified aramid fiber, the two sides of the modified aramid fiber are coated with low-emissivity slurry, and the low-emissivity slurry comprises nickel micro powder modified resin; the reinforced skeleton layer comprises a carbon fiber yarn and pre-oxidized fiber blend, and a conductive layer is attached to the surface of the carbon fiber yarn; the low-emissivity surface layer comprises nickel micro powder modified resin and ceramic micro powder. The preparation method of the fabric comprises the following steps: modifying the aramid fibers, pretreating the carbon fibers and the pre-oxidized fibers, coating by using low-emissivity slurry, bonding, and then carrying out hot press molding. The fabric can reflect 90% of radiant heat, and the emissivity lt of the spectrum at the wave band of 8-14 microns is achieved; the cable has excellent thermal imaging and far infrared prevention functions, has a flame retardant grade V0, and is suitable for various civil scenes.

The application relates to the technical field of infrared stealth, precise thermal control and electromagnetic compatibility, and particularly discloses a film system structure with visible ultra-high reflectivity, middle-infrared and far-infrared low emissivity and microwave high permeability; the medium stack layer has high reflectivity to visible light; the metal microstructure layer has low emissivity to middle-infrared and far-infrared light and high permeability to microwaves; the film system structure has visible light reflectivity greater than 60%, middle-infrared and far-infrared light emissivity lower than 30% and microwave permeability higher than 60%. The application realizes perfect compatibility of infrared stealth and microwave absorption, keeps infrared low emissivity (epsilon < 0.1) and realizes high permeability (greater than 95%) to 1-18GHz microwave bands. The application solves the thermal failure problem of the composite stealth structure, realizes average visible light reflectivity (greater than 95%) through the medium stack layer, greatly reduces the solar heat load and improves the overall optical performance.

The invention provides a middle-infrared-band low-infrared-emissivity material and a preparation method thereof. The middle-infrared-band low-infrared-emissivity material comprises a low-emissivity composite layer, an anti-rust paint layer and a base layer which are sequentially connected. The low-emissivity composite layer is one of a first low-emissivity layer, a second low-emissivity layer and a second low-emissivity layer; the raw material of the first low-emissivity layer is one or more of polyurethane resin, fluorocarbon resin and epoxy resin; the raw material of the second low-emissivity layer is one of a conductive film and compound slurry; the conductive thin film is one or more of antimony-doped tin oxide, fluorine-doped tin oxide, indium tin oxide, aluminum-doped zinc oxide and a silver nanowire transparent thin film. The polyurethane resin provided by the invention can reduce the introduction of oxygen-containing functional groups, so that the polyurethane resin has lower emissivity and good light transmittance in the wave band of 8-14 microns, and the low emissivity of the material can be controlled by regulating and controlling the thickness of the polyurethane resin layer.

The tunable infrared selective thermal emitter based on a cylindrical structure array belongs to the field of micro-nano optoelectronic technology; it is composed of multiple tunable structural units arranged periodically. Sunlight is incident in the form of a plane wave. Each tunable structural unit includes a substrate layer, a buffer layer, and an antenna from bottom to top. The substrate layer and the buffer layer are square in shape, and the antenna is a three-layer cylindrical structure. The structure of the present invention is simple. In the atmospheric windows of 3-5μm and 8-14μm, the average emissivities are about 0.20 and 0.18 respectively, and the average emissivity in the non-atmospheric window of 5-8μm is about 0.80. Moreover, it is not affected by the polarization of the light source and has good emission effects within the incident angle range of 0°-60°. The addition of GST enables the thermal emitter to not only meet the requirements of low emissivity in the atmospheric window and radiative heat dissipation in the non-atmospheric window, but also tune the infrared emissivity spectrum to achieve switching between the infrared "stealth" and "non-stealth" states.

The application provides a substrate carrier, a conveying system, a vacuum system and a method for operating the substrate carrier, the substrate carrier comprising a bearing frame, a substrate bearing surface, a groove and a heat absorbing sheet, the substrate bearing surface is used for placing a substrate, a groove is arranged on the bottom side of each substrate bearing surface, a heat absorbing sheet is arranged on the bottom surface of the groove, the emissivity of the first surface of the heat absorbing sheet is greater than the emissivity of the second surface of the groove bottom surface and / or the heat absorbing sheet, in this case, the low emissivity surface can inhibit heat dissipation, and the high emissivity surface can allow heat to pass through efficiently, therefore the first surface of the heat absorbing sheet can reabsorb the thermal radiation of the substrate and transmit to the second surface or the groove bottom surface, and good heat dissipation effect is achieved. This technology is simple and low in cost, meanwhile, the coating speed does not need to be reduced, and the problem of temperature rise of the substrate can be effectively solved without reducing the processing efficiency.

The invention provides a visible light transparent-mid-infrared low-emissivity composite material and a preparation method thereof. The visible light transparent-mid-infrared low-emissivity composite material sequentially comprises a base layer, an anti-rust paint layer, a first transparent resin layer, a plasmon nano functional filler layer and a second transparent resin layer from inside to outside, the light transmittance of the composite material at the wave band of 400-700 nm is greater than 80%, and the infrared emissivity at the wave band of 8-14 [mu] m is less than 0.55. The light transmittance of the composite material in the wave band of 400-700 nm is larger than 80%, the infrared emissivity of the composite material in the wave band of 8-14 microns is smaller than 0.55, and high visible light transparency and low intermediate infrared emissivity of the material can be both considered; and a transparent material system can be effectively introduced on the premise that the structural stability and the process feasibility of the plasmon nano functional material are ensured, so that the synergistic compatibility between the plasmon nano functional material and the transparent material system is realized.

The invention relates to a high-thermal-conductivity high-temperature solar photothermal conversion coating and a preparation method and application thereof, and belongs to the technical field of new energy materials. According to the method, a high-thermal-conductivity Sr or Ca-doped LaCoO3 oxide material is used as a main component of the coating, and double-layer spraying preparation of a body layer and a surface layer is adopted. Compared with a traditional spinel oxide-based coating, the coating prepared through the method has the advantages that the heat conductivity is remarkably higher, meanwhile, the high light absorption rate (higher than 95%) and the low emissivity (lower than 0.65) are achieved, surface heat radiation and heat convection loss are remarkably reduced under the high-temperature working condition, and therefore the photo-thermal conversion efficiency is improved. The photo-thermal conversion efficiency of the coating is remarkably higher than that of a commercial product PyroMark2500, and the preparation method is simple, low in cost and capable of achieving large-scale production.

The invention discloses a high-temperature stable spectrum selective infrared film and a preparation method thereof, and belongs to the technical field of infrared functional materials. The thin film adopts a Fabry-Perot cavity multi-layer structure and sequentially comprises a bottom infrared reflecting layer, a top infrared reflecting layer, a top infrared reflecting layer, a bottom infrared reflecting layer and a top infrared reflecting layer from bottom to top, the intermediate dielectric resonance layer is prepared from an infrared transparent semiconductor material; the upper-layer part absorption layer is a metal thin film; the top packaging protection layer is made of an infrared transparent dielectric material; wherein the intermediate medium resonance layer is of a crystalline structure formed through thermal pretreatment, and the crystalline structure fundamentally inhibits interdiffusion of elements between film layers and structural phase change at high temperature; through the design, the thin film has low emissivity in atmospheric window wave bands of 3-5 microns and 8-14 microns, has high emissivity in a non-detection wave band of 5-8 microns, and can be used at the temperature of 600 DEG C for a long time.

The present invention provides a low-emissivity film, a coated laminated glass and a coated hollow glass, wherein the low-emissivity film comprises a first composite layer, a second composite layer, a third composite layer, a fourth composite layer, and an outermost protective layer; the first composite layer, the second composite layer, the third composite layer, and the fourth composite layer respectively comprise a dielectric layer, a functional layer, and a transition layer; the first dielectric layer is configured to block diffusion of destructive atoms into the first functional layer during heat treatment, and the second dielectric layer, the third dielectric layer, and the fourth dielectric layer are configured to increase an optical path of visible light; the first functional layer and the fourth functional layer are made of a silver-indium alloy material, and the second functional layer and the third functional layer are made of a silver material; the transition layer is made of a mixture material of a zinc- aluminum alloy and a zinc-tin alloy; the outermost protective layer comprises a third sub-layer prepared according to a single-rotating magnetron sputtering cathode equipped with a Hipims power supply, which can improve the surface mechanical properties and thermal stability of the film layers.

The application discloses a kind of heating and heat dissipation bidirectional personal thermal management fabric and preparation method thereof, belong to thermal management fabric design technical field.The main surface of fabric is sprayed with a layer of amorphous structure photonic crystal coating, the reflectivity of fabric in visible light near infrared band and the emissivity in mid-infrared band are improved, the physical coloring of no thermal burden is realized on the surface of fabric to meet the demand of diversification and beauty of textile, the MXene nanosheet of low emissivity is sprayed on the other side of fabric, the passive radiation heating performance, photothermal conversion performance and joule heating performance of MXene are used to realize the heating thermal management of fabric, the fabric of the application realizes dynamic personal thermal management, that is, compared with the temperature of simulated human skin, the temperature can be reduced by 10.2 DEG C in summer, and the temperature can be increased by 21.4 DEG C in winter by combining the heating effect of multiple modes, to provide greater flexibility for personal thermal management under different environmental conditions.

A composite pane having an IR reflective coating and a low emissivity coating and a method to provide for the pane and to uses thereof.

The present invention provides an infrared low emissivity material and a preparation method thereof, the preparation method comprising: (1) mixing barium carbonate, strontium carbonate, aluminum oxide and silicon dioxide and sintering the mixture to obtain Ba x Sr 1‑x Al2Si2O8 ceramic powder; (2) the Ba x Sr 1‑ x The Al2Si2O8 ceramic powder is ball-milled to obtain the infrared low emissivity material. x Sr 1‑x Al2Si2O8 ceramic powder, and prepare Ba by doping barium carbonate and strontium carbonate x Sr 1‑x Al2Si2O8 ceramic powder can increase the mobility of carriers in ceramic powder, thereby increasing the conductivity of the material; in addition, the Ba x Sr 1‑x The ball milling treatment of Al2Si2O8 ceramic powder can, on the one hand, control the morphology and size of the powder. On the other hand, the ball milling process will cause the molecules and atoms in the ceramic powder to vibrate and rotate, thereby enhancing the powder's absorption in the infrared band. In this way, under the synergistic effect of conductivity and crystal vibration, the infrared emissivity of the material in a high-temperature environment can be significantly reduced.

A space active optical cable (SAOC) includes a cable including one or more optical fibers, and two or more electrical transceivers on opposing ends of the cable and interconnected by the cable. Each of the electrical transceivers includes an enclosure that encloses one or more light sources, one or more light detectors, and control electronics. Also included in the enclosure are a coupling medium to couple light into and out of the one or more optical fibers. The coupling medium can be reflecting surface or an on-axis mount. The enclosure provides a suitable heat propagation and electromagnetic interference (EMI) shielding, and the cable and the two or more electrical transceivers are radiation resistant. SAOC features optionally support a health check algorithm that allows trending optical performance in the absence of an optical connector and a potential surface treatment to increase nominally low emissivity of an EMI conductive surface.

The present invention provides an infrared low-emissivity coating, the raw materials for preparing the coating include an inorganic phosphate adhesive, an infrared low-emissivity filler and a surfactant; wherein the infrared low-emissivity filler is prepared by sintering and ball-milling barium carbonate, strontium carbonate, aluminum oxide and silicon dioxide in sequence. In this solution, the infrared low-emissivity filler is first prepared using barium carbonate, strontium carbonate, aluminum oxide and silicon dioxide as raw materials, and ball-milling is performed on the filler, which is conducive to the synergistic effect of conductivity and crystal vibration, thereby significantly reducing the infrared emissivity of the filler in a high-temperature environment. The infrared low-emissivity filler prepared above is mixed with an inorganic phosphate adhesive and a surfactant, and an infrared low-emissivity coating is prepared by a blade coating method, so that the coating has good temperature resistance and low infrared emissivity at high temperatures.

A tungsten-doped vanadium dioxide layer radiant heat management film comprises a metal base layer; the tungsten-doped vanadium dioxide layer is arranged above the metal base layer; the first germanium layer is arranged above the tungsten-doped vanadium dioxide layer; the zinc sulfide layer is arranged above the germanium layer; the quasi-periodic structure layer is arranged above the zinc sulfide layer, and the quasi-periodic structure layer is formed by alternately stacking calcium fluoride layers and second germanium layers; through the room temperature phase change characteristic of the tungsten-doped vanadium dioxide layer, passive switching of the tungsten-doped vanadium dioxide layer radiant heat management film between relatively high emissivity cooling in the daytime and relatively low emissivity heat preservation at night is achieved. Through the room temperature phase change characteristic of W-VO2, passive switching between daytime high-emissivity cooling and night low-emissivity heat preservation is achieved, and the problems that in the prior art, a radiant heat management device is low in emissivity and cannot be manufactured on a large scale are solved.

The invention discloses a narrow-temperature-zone and high-regulation-ratio thermal control system suitable for a deep space environment. The thermal control system can automatically regulate a thermal control object to be in a comfortable temperature range of 0-40 DEG C in a deep space extreme high-low-temperature environment. A binary two-phase heat transfer device is adopted to be uniformly connected with a controlled object and a radiation heat dissipation surface, and a thermally induced variable emissivity coating is arranged on the radiation heat dissipation surface, so that a temperature self-adaptive controllable radiator is formed. When the system faces an environment with large self-heating and strong heat flow outside the space, the temperature of the system is above a high temperature point Th, the binary two-phase heat transfer device is conducted to transfer heat, and the thermally induced variable emissivity coating is at high temperature and high emissivity to efficiently transfer and dissipate the heating amount of the equipment; when the system faces an environment with small self-heating and weak heat flow outside the space, the temperature of the system is below a low-temperature point Tc, the binary two-phase heat transfer device is blocked, the thermally-induced variable emissivity coating is in a low-temperature and low-emissivity state, heat is stored in the equipment, and it is guaranteed that the lower temperature limit of the electronic equipment is maintained in a comfortable working range.

A glazing panel 300 for a vehicle comprising an outer glazing layer 302 which is adhered to an inner glazing layer 304; a low emissivity coating 308 located on the glazing panel; and a heating assembl

The present application relates to a kind of hot switch intelligent phase change wall, including heat transfer control board block with heat pipe as core, energy storage board block with phase change wall as core, characterized by: the indoor and outdoor sides of the hot switch intelligent phase change wall are heat transfer control board block, and gravity heat pipe is arranged in, the working medium is in the heat pipe, the inner surface of the heat transfer cavity is provided with low emissivity material, the heat transfer cavity of the heat pipe is provided with control device, control device is made of multiple groups of connecting pieces, can be switched by changing the space position state of connecting piece and heat pipe disconnect or connection state, to control the heat transfer of heat pipe start-stop and the heat transfer direction of heat pipe when working.The phase change energy storage board block is located in the middle of heat transfer control board block on the inside and outside of wall, can store / release heat using the high latent heat performance of phase change material, and the phase change wall is provided with metal fin.

The application relates to a low-layer one-dimensional infrared low-emissivity film structure which is insensitive to polarization and incident angle. The technical scheme is as follows: the low-layer one-dimensional infrared low-emissivity film structure is composed of a one-dimensional lambda / 4 periodic photonic crystal structure and a quasi-periodic photonic crystal structure, the last layer of the one-dimensional lambda / 4 periodic photonic crystal structure is connected with the top layer of the quasi-periodic photonic crystal structure. The low-layer one-dimensional infrared low-emissivity film structure is expressed by the following formula: (AB) 2 (CD) 5 ; wherein: (AB) 2 represents the one-dimensional lambda / 4 periodic photonic crystal structure, (AB) represents a sub-periodic photonic crystal structure in which Ge and ZnO are arranged in sequence; (CD) 5 represents the quasi-periodic photonic crystal structure, and (CD) represents a sub-quasi-periodic photonic crystal structure in which Ge and ZnO are arranged in sequence. The application has the characteristics of few layers, short production cycle, high reliability, realization of double-band low emission and insensitivity to polarization and incident angle.

The application discloses a thermal spraying flame heat recovery and recycling device based on emissivity regulation, and aims at solving the problems of serious flame heat dissipation, low energy utilization rate and insufficient melting of high melting point powder in the existing plasma thermal spraying process. The thermal spraying flame heat recovery and recycling device is provided with a heat recovery cover at the outlet end of a plasma thermal spraying device, the heat recovery cover is a high-temperature-resistant shell, the high-temperature-resistant shell is internally provided with a hollow cavity, the hollow cavity forms a vacuum heat insulation interlayer, the inner surface of the cover of the high-temperature-resistant shell is provided with a high-emissivity coating, the high-emissivity coating is a perovskite coating, a spinel coating or a pyrochlore / defect fluorite coating, the outer surface of the cover of the high-temperature-resistant shell is provided with a low-emissivity coating, and the low-emissivity coating is a metal-doped ZnO coating. The thermal spraying flame heat recovery and recycling device can not only significantly improve the energy utilization rate of the thermal spraying flame, but also improve the coating quality and service protection performance.

The application discloses a silicon-based photonic crystal capable of realizing infrared / laser / visible light compatible stealth and a preparation method thereof, and belongs to the technical field of functional thin film materials. The silicon-based photonic crystal is composed of a substrate, an infrared light band film layer and a visible light band film layer from bottom to top, the infrared light band film layer is composed of thin film layers of high and low refractive index materials with different thicknesses which are sputtered and deposited alternately, and the most surface visible light band film layer is composed of a thin film layer of low refractive index material. The total layer number of the silicon-based photonic crystal is 12-16. The application is suitable for electromagnetic wave detectors of different wavelengths; can realize selective low emissivity, achieve reasonable utilization of non-infrared atmospheric windows for radiation heat dissipation and laser compatible stealth effect with 10.6 mu m; can realize camouflage colors matched with different environments such as forests, oceans and deserts, achieve visible light stealth compatible with infrared / laser stealth; the preparation process does not need to replace target materials, realizes in-situ integrated preparation, realizes control of film layer thickness and uniformity through optimization of sputtering parameters, and has high film forming quality.