32 results about "Solar absorption" patented technology

The invention discloses a passive radiation-cold storage composite box body and a preparation method. The box body sequentially comprises a composite radiation film, a heat insulation layer and a cold storage layer from outside to inside. The outer-layer radiation film is composed of an elastic organic matrix and high-reflection inorganic particles such as barium sulfate, has high solar reflectivity and mid-infrared high emissivity, and can effectively restrain solar absorption and achieve radiation heat dissipation in the daytime. The heat insulation layer is made of XPS, EPS, aerogel felt and other low-heat-conduction materials so as to reduce external heat transfer. Phase change microcapsules are dispersed in the cold storage layer, and flake graphite and other high-thermal-conductivity fillers can be added to improve the cold transfer efficiency and temperature uniformity. And the phase-change material realizes automatic cold storage and cold release through a latent heat mechanism, so that the temperature in the box body is kept stable. Through the synergistic effect of radiation refrigeration, heat insulation and phase change cold storage, long-time and recyclable passive cold chain temperature control is achieved, and the device has the advantages of being simple and convenient in structure, high in cost performance, flexible in application, uniform in internal temperature distribution and the like.

The invention relates to the technical field of photo-thermal materials, and discloses a photo-thermal composite material and a preparation method and application thereof. The photo-thermal composite material is a layered composite metal hydroxide; wherein metal sulfide grows on a laminate of the layered composite metal hydroxide in situ. And dissolving the layered composite metal hydroxide, a sulfur source and a structure-directing agent in a solvent, and reacting to obtain the photo-thermal composite material. The method provided by the invention is green and efficient, overcomes the defects of tedious steps and low yield of preparation of the photo-thermal composite material in the prior art, and improves the sunlight absorption performance, photo-thermal conversion capability and photo-thermal stability of the photo-thermal composite material by virtue of the interaction between the layered composite metal hydroxide and the sulfide.

The invention relates to an intelligent thermal control device with a high emissivity change value and a low solar absorptivity and a preparation method thereof. The intelligent thermal control device with the high emissivity change value and the low solar absorptivity is of a multi-layer composite structure and sequentially comprises a light base material, an infrared high-reflection metal layer, a transparent medium layer, a VO2 phase change layer, an infrared antireflection layer and a visible light reflection increasing layer from bottom to top. The infrared antireflection layer is made of germanium or silicon; the visible light reflection increasing layer is of a multi-layer structure formed by alternating high-refractive-index material films and low-refractive-index material films, and the materials are at least two of HfO2, Al2O3, TiO2, Ta2O5, SiO2, CaF2, MgF2, ZnSe and ZnS.

The film is of a layered structure, the middle of the film is an organic base material, the base material comprises a first surface and a second surface, and a transition layer, an electromagnetic absorption layer, an isolation layer, an electromagnetic reflection layer and a thermal radiation reflection layer are sequentially distributed on the first surface and the second surface. Meanwhile, penetrating through holes are distributed in the surface of the film, and conductive layers are attached to the inner walls of the through holes to communicate all the layers. The thin film utilizes the closed reflection effect of the electromagnetic reflection layer and the loss effect of the electromagnetic absorption layer, and the electromagnetic shielding effectiveness of the thin film in the wave band of 10 MHz to 10 GHz is larger than 80 dB; the hemispherical emissivity of the heat radiation reflecting layer on the outermost layer is 0.03-0.05, and the solar absorptivity is 0.09 + / -0.02. The preparation method of the thin film comprises the steps of substrate plasma modification, magnetron sputtering deposition of the multi-layer functional film, punching, vacuum evaporation plating of the heat radiation reflecting layer, annealing treatment and the like, and the process controllability is high. The thin film integrates the functions of electromagnetic shielding, thermal control, static prevention and heat dissipation, and has important application value in the field of aerospace equipment.

The invention provides a universal, simple and extensible intramolecular hydrogen bond activation strategy for preparing the covalent organic framework material by utilizing a Michael addition method. The material can be efficiently prepared within an extremely short time, and has the characteristics of high crystallinity, high porosity, high stability, rich functional groups and the like, in addition, the COF material can be very conveniently subjected to structure and functional design, and various functional groups can be easily introduced in advance or after modification. Due to the unique structure, rapid gram-scale synthesis can be realized through a simple amplification experiment, and high crystallinity is still realized. Wherein the COF rich in azobenzene groups has a proper pore structure and good solar energy absorption and photo-thermal conversion performance, can provide a proper catalytic microenvironment temperature under illumination after being loaded with lipase, realizes catalytic resolution of a chiral substrate, and has a great industrial practical application prospect.

The application discloses a heat control device and method for a flexible thin film antenna in space, which is mainly used for providing heat control for large flexible antennas such as phased array radars in space. A solar shield with high infrared emissivity, low solar absorptivity and microwave permeability is arranged on the front surface of the antenna, and when the back surface of the antenna is irradiated by the sun, the solar shield can quickly dissipate heat by using the high infrared emissivity, and when the front surface of the antenna is irradiated by the sun, the solar shield can prevent the antenna from absorbing too much heat and making the temperature of the antenna too high by using the low solar absorptivity; an insulating layer and a low solar absorptivity coating are arranged on the back surface of the antenna, and when the back surface is irradiated by the sun, the low solar absorptivity coating can reflect most of the solar heat, and when the back surface is in a shadow area, the insulating layer can prevent the temperature of the antenna from being too low. Therefore, the antenna can always be in a relatively suitable temperature range in the complex and changeable space orbit thermal environment. The application has the characteristics of strong adaptability and wide applicability.

The invention particularly relates to a polyimide flexible composite film for spaceflight and a preparation method of the polyimide flexible composite film. The polyimide flexible composite film for spaceflight comprises an optical function layer, a supporting layer, a bonding layer and a reinforcing layer which are sequentially stacked. According to the invention, through the design and preparation process of the four-layer structure composite film, the product weight reduction is realized, the weight is reduced compared with the existing product, and the launch cost of a spacecraft can be reduced; the heat control performance is good, the solar absorption ratio of an aluminized surface is low, the hemispherical emissivity is low, the alpha s / epsilon h ratio is small, and the heat control characteristic is superior to that of a traditional aluminized film; an ultra-thin structure design is adopted, and the thickness is smaller than that of existing similar products; by introducing the silicon dioxide protective layer, the tolerance of the aluminum layer to atomic oxygen is improved, the service life of the material in a space environment is prolonged, the optical performance change is small after a thermal cycle test, and the material has good environmental adaptability; meanwhile, certain electromagnetic shielding capability is achieved, and the aerospace application requirement can be met.

The present application relates to a kind of functional protective coating, the coating is made of the following mass parts of raw materials: functional pigment 10~13 parts, filler 2~5 parts, high temperature resistant resin 21~43 parts, anhydrous ethanol 43.7~51 parts, dispersing agent 4~10 parts, defoaming agent 0.3~1.1 parts, leveling agent 3~6 parts;The functional pigment is high-entropy boride ceramic material, the cation in the high-entropy boride ceramic material is at least 5 kinds in metal element Co, Ni, Cr, Cu, Fe and Mo, and each metal element is equimolar ratio.Simultaneously, the preparation method of the functional protective coating is disclosed.The coating obtained by the present application has the characteristics of excellent performance, wide application range, low cost and simple construction process, and has high temperature corrosion resistance, anti-coking, high infrared radiation and solar absorption capacity.

The application discloses a solar refrigeration system with a cold storage function, comprising a solar absorption refrigeration device, wherein the solar absorption refrigeration device comprises a solar heat collector and an absorption refrigeration system, the absorption refrigeration system comprises a generator, a first condenser, a first throttling valve, a first evaporator and an absorber, steam or hot water generated by the solar heat collector is used as a heat source of the absorption refrigeration system, and the solar refrigeration system further comprises a vapor compression refrigeration device, a cold storage device and a controller. The solar refrigeration system with the cold storage function and the control method thereof can maximize utilization of solar energy resources and fully utilize the advantages of the absorption refrigeration system, and solve the problem of energy waste caused by closing the absorption refrigeration system or simultaneously starting the absorption refrigeration system and other mode refrigeration in the prior art.

The invention relates to the field of surface engineering, and discloses a micro-arc oxidation electrolyte and application thereof, a thermal control film layer and a preparation method thereof, and a thermal control component. The electrolyte comprises silicate, phosphate, lanthanum salt and hydroxide, and the pH value of the electrolyte is strong alkaline. According to the strong alkaline electrolyte suitable for preparing the micro-arc oxidation thermal control film layer, the lanthanum salt with the valence of + 3 is introduced into the electrolyte, the lanthanum salt, the silicate and the phosphate form an adaptive composite salt system, and the thermal control film layer with the low solar absorptivity and the high infrared emissivity can be formed on the surface of a metal base material through the micro-arc oxidation technology; and meanwhile, the hardness of the film layer is remarkably improved to 450 HV or above, and the precise assembly requirement of light-weight components is met.

This invention discloses a tethered binary star multi-condition adaptive thermal control structure, including a primary star thermal control module, a secondary star thermal control module, a dynamic thermal management module, and a binary star collaborative thermal management module. The adaptive thermal control structure adopts a hybrid architecture of passive heat dissipation as the primary method and active heating as a secondary method. The primary star thermal control module has a low solar absorptivity, high infrared emissivity, and anti-atomic oxygen white paint coating applied to the -X, -Y, and +Z planes of the primary star. It is equipped with a 10-unit modular multilayer thermal insulation component and a high thermal conductivity graphite film, with the overall weight controlled to ≤1.25kg. This invention is rationally designed and provides a hybrid thermal control architecture of passive heat dissipation as the primary method and active heating as a secondary method, achieving primary / secondary star zoned thermal control, multi-condition dynamic adaptation, and binary star collaborative thermal management, meeting weight, power constraints, and full-cycle temperature requirements.

The invention relates to a near-blackbody high-entropy inverse spinel oxide material, the general formula of the material is (A1xA2yA3zA4uA5v) 3O4, A1, A2, A3, A4 and A5 are any five elements of Fe, Ni, Co, Cr, Mn, Cu and Ti, x, y, z, u and v are equal or approximately equal, and x + y + z + u + v = 1; the structure of the material belongs to a cubic system and has an inverted spinel crystal structure, and the space group of the material is Fd-3m. Meanwhile, the invention also discloses a preparation method of the material. The method is simple to operate and short in production cycle, the obtained high-entropy inverse spinel oxide material has high solar absorptivity and infrared emissivity, the radiation curve of the high-entropy inverse spinel oxide material is close to an ideal black body radiation curve, and the high-entropy inverse spinel oxide material can be widely applied to the fields of radiation heating, human body heat management, aerospace heat dissipation, photovoltaic device cooling and the like.

The invention discloses a heat dissipation electromagnetic shielding film for spaceflight and a preparation method thereof, the prepared film is of a multi-layer structure, and a transition layer, an electromagnetic absorption layer, an isolation layer, an electromagnetic reflection layer and a thermal radiation reflection layer are sequentially arranged on a first surface of a base material; an electromagnetic reflecting layer, a heat radiation reflecting layer, a heat radiation layer and an anti-static layer are sequentially arranged on the second surface of the conductive base material; through holes are distributed in the surface of the electromagnetic shielding film; metal coatings are attached to the inner walls of the through holes, and all layers of the thin film are communicated through the metal coatings. The anti-static layer is prepared by sequentially sputtering the electromagnetic reflecting layer on the second surface of the base material, depositing the thermal radiation reflecting layer through vacuum evaporation, then coating the thermal radiation layer and curing, and coating conductive liquid or in a magnetron sputtering mode. The second surface of the electromagnetic shielding film has low solar absorptivity and high hemispherical emissivity, the solar absorptivity is less than or equal to 0.40, the hemispherical emissivity is not less than 0.60, and the electromagnetic shielding film has a good heat dissipation function and adapts to harsh application scenes in the aerospace field.

The invention relates to a sunscreen fiber, a preparation method thereof and a radiation refrigeration fabric. The sunscreen fiber comprises a core layer and a skin layer coating the surface of the core layer, wherein the core layer comprises a carbon-based nano material, the skin layer comprises radiation refrigeration particles, the absorptivity of the carbon-based nano material to sunlight at the wave band of 0.3-2.5 microns is a, the mass fraction of the carbon-based nano material in the core layer is m1, the atmospheric window emissivity of the radiation refrigeration particles at the wave band of 8-13 microns is b, and the sunlight reflectivity of the radiation refrigeration particles at the wave band of 0.3-2.5 microns is c, the mass fraction of the radiation refrigeration particles in the skin layer is m2, and a, b, c, m1 and m2 meet the following condition that c is larger than or equal to 88%. The sunscreen fiber has excellent sunlight total spectrum reflection performance and shading performance, and the radiation refrigeration fabric prepared from the sunscreen fiber as a raw material has extremely low sunlight transmittance, so that a better radiation refrigeration effect can be achieved.

The utility model provides a solar panel connecting device and a swing frame, and belongs to the technical field of connecting equipment, the solar panel connecting device comprises a connecting piece used for being fixedly connected with the swing frame; the steering adjusting piece comprises a first connecting part connected with the connecting piece, a second connecting part is arranged on the first connecting part in a hinged mode, and a third connecting part is arranged on the second connecting part in a hinged mode; the hinge rotation direction of the second connecting part relative to the first connecting part is perpendicular to the hinge rotation direction of the third connecting part relative to the second connecting part, and the third connecting part is used for being fixed to a solar panel. The solar swing has the advantages that through the unique multi-hinge design of the solar panel connecting device, the solar panel can flexibly swing in multiple directions relative to the swing frame, and therefore the solar energy absorption efficiency is remarkably improved.

The invention provides a thermal control coating with high temperature, high infrared radiation and high solar spectrum reflection performance, a coating and a preparation method. The thermal control coating comprises a prime coating and a surface coating, the bottom layer coating takes a silica sol modified lithium silicate solution as a bottom layer binder, takes mixed powder of copper chromite and zinc orthotitanate as a bottom layer filler, and takes water as a solvent; and the surface layer coating takes a silica sol modified lithium silicate solution as a surface layer binder, takes mixed powder of zinc orthotitanate and 8YSZ (8mol% Y2O3 doped ZrO2) as a surface layer filler, and takes water as a solvent. The thermal control coating is formed by spraying a thermal control coating, the bottom layer is obtained by spraying the bottom layer coating, and the surface layer is obtained by spraying the surface layer coating on the bottom layer. Through coating structure optimization and ingredient improvement, the high-temperature heat dissipation coating has high high-temperature emissivity and low solar absorptivity, the infrared emissivity at 600 DEG C can reach 0.80-0.85, the solar absorptivity is 0.30-0.40, and the high-temperature heat dissipation coating has a good high-temperature heat dissipation effect.

The invention relates to the technical field of radiation refrigeration, in particular to a multi-band synergistic V-shaped radiation refrigerator and application thereof. The structure comprises a diffuse reflection type vertical refrigeration part, a dual-waveband reflection part, a heat insulation part and a heat conduction connection part, the diffuse reflection type vertical refrigeration part is vertically and mechanically fixed on one surface of the heat conduction connecting part and forms heat transfer connection; the heat insulation part is arranged on the surface of the heat conduction connection part and surrounds the diffuse reflection type vertical refrigeration part; the dual-band reflection parts are rotationally connected to the heat insulation part and are arranged on the two sides of the diffuse reflection type vertical refrigeration part to form a symmetrical V shape; the diffuse reflection type vertical refrigeration part is used for radiating heat outwards through infrared radiation so as to provide a refrigeration effect; the dual-band reflection part is used for changing a radiation heat exchange path of the diffuse reflection type vertical refrigeration part, so that the radiation heat exchange is carried out between the diffuse reflection type vertical refrigeration part and outer space with lower temperature; the whole sunlight absorptivity of the device can be greatly reduced, the problem of sunlight wave band light traps in the prior art is solved, and the radiation refrigeration performance is remarkably improved.

The application discloses a climate self-adapting spectrum regulation structure of a non-transparent outer wall skin in a severe cold area, and belongs to the technical field of building materials. The climate self-adapting spectrum regulation structure comprises a base wall body, an asymmetric radiation base arranged outside the base wall body, a spectrum self-adapting functional layer arranged outside the asymmetric radiation base, and a weather-resistant protective layer arranged outside the spectrum self-adapting functional layer. The spectrum self-adapting functional layer comprises a composite shell microcapsule and a film-forming adhesive. The climate self-adapting spectrum regulation structure changes the radiation visual field of the skin to the sky, the ground and surrounding structures through an asymmetric structure, improves the effective radiation heat exchange capacity of the skin to the sky in summer, and weakens the interference of low-position heat sources on the reverse radiation of the skin. The climate self-adapting spectrum regulation structure can make the outer wall skin exhibit higher solar absorption and lower radiation heat dissipation under low-temperature conditions, and exhibit higher solar reflection and higher atmospheric window emission under high-temperature conditions by using the composite shell microcapsule.

The invention discloses a film system structure with functions of high solar absorption, high middle and far infrared transmission and high microwave transmission. The film system structure sequentially comprises a solar antireflection layer, a loss type Fabry-Perot cavity absorption layer, an infrared refractive index matching antireflection layer and a substrate layer from top to bottom, the solar anti-reflection layer has low reflection on a solar spectrum band; the solar anti-reflection layer, the loss type Fabry-Perot cavity absorption layer and the infrared refractive index matching anti-reflection layer are all highly transparent to middle and far infrared bands and microwaves. According to the invention, a cascade absorption cavity for sunlight and a refractive index matching structure for infrared light are constructed by using optical loss differences of materials in different wavebands. The absorptivity in the solar spectrum (AM1.5 or AM0) can exceed 0.9, providing a dark black appearance; meanwhile, high transmissivity is kept in two key wave bands of MWIR and LWIR, and the variable emissivity thermal control capability of a bottom-layer SRD device is perfectly kept.

The invention relates to the technical field of intelligent thermal control, in particular to a flexible intelligent thermal control device and a preparation method and a regulation and control method thereof. The device comprises a transparent upper substrate, a top electrode structure, an electrolyte layer, a bottom electrode layer and a transparent lower substrate which are sequentially stacked, the top electrode structure is a multi-layer composite structure comprising a conductive layer, a deposition catalyst layer and a surface structure layer; and the electrolyte layer contains metal salt capable of generating reversible electrodeposition reaction. According to the invention, a metal reversible electro-deposition mechanism is combined with a unique multi-layer top electrode structure, so that independent, collaborative and dynamic regulation and control of visible light and infrared dual wavebands are realized; the problems that an existing intelligent thermal control technology is single in function, or regulation and control of the solar absorptivity and the infrared emissivity are seriously coupled, and the dynamic thermal environment is difficult to independently optimize and adapt are solved.

The invention discloses an AC / DC power distribution network energy storage and SOP double-layer optimization configuration method, and the method comprises the steps: generating a typical wind and light load output scene through employing K-means clustering based on historical wind, light and load data; constructing a double-layer optimization model, and performing configuration optimization on the upper layer by adopting a self-adaptive particle swarm optimization algorithm by taking the energy storage and the installation position and capacity of the SOP intelligent soft switch as decision variables and taking the minimum annual comprehensive cost as a target; the lower layer performs operation optimization by taking an upper layer configuration result and a typical scene as input, taking minimization of system operation total cost including electricity purchase cost, network loss and the like as a target and considering a whole set of alternating current and direct current power flow and operation constraints; and collaborative optimization configuration of energy storage and SOP is realized through iterative interaction of the upper-layer model and the lower-layer model. According to the method, the wind and light absorption capacity of the system is remarkably improved, the power quality of the power grid is effectively improved, the comprehensive operation cost of the system is reduced, the calculation method is mature, and the method has high engineering practical value.

The application discloses a composite textile with passive radiative cooling and heat preservation functions and a preparation method thereof, and the method comprises the following steps: preparing a porous polypropylene fiber membrane through a melt-blown process, depositing silicon dioxide nanoparticles through ultrasonic deposition, and then adopting a laminating process to combine a polyurethane microporous membrane and a carbon nanotube film, so that the composite textile with double-mode heat management characteristics is obtained. When the polyurethane layer faces the sun, the material shows high solar reflectivity and high infrared emissivity in the atmospheric window band, so that efficient passive radiative cooling is realized; when the carbon nanotube film faces the sun, the material has high solar absorptivity and low infrared emissivity, so that excellent heat preservation performance is realized. The method is simple in process, suitable for large-scale production, can effectively reduce energy consumption, and has a wide application prospect in the fields of personal heat management and the like.

The invention provides a thermal control structure suitable for an MEO microwave antenna, and belongs to the field of space thermal control. The MEO microwave antenna thermal control structure comprises an anti-radiation thermal control film, curing glue and a low-heat-conduction supporting column. The supporting column is installed on the surface of the microwave antenna waveguide through threads, and the anti-radiation thermal control film is attached to the top face of a cylindrical head of the supporting column through curing glue points. The thermal control film has low solar absorptivity and high hemispherical emissivity, the inner surface of the thermal control film performs radiation heat exchange with the waveguide, and the outer surface of the thermal control film performs radiation heat exchange with the space heat sink; the supporting columns are made of low-heat-conduction materials, heat conduction heat resistance from the waveguide to the thin film is increased, and heat leakage to a space heat sink is reduced. According to the invention, the compensation power consumption of the heater is remarkably reduced while the temperature of the antenna assembly meets the long-term working requirement in the MEO irradiation environment, and the space environment adaptability, the heat dissipation reliability and the wave-transparent performance are considered.

The invention relates to a lunar dust prevention coating suitable for the surface of a thermal control coating of a spacecraft and a preparation method of the lunar dust prevention coating, and belongs to the technical field of special functional coatings, the lunar dust prevention coating is coated on the surface of the thermal control coating, so that the thermal control coating is endowed with an excellent lunar dust prevention function. The scratch resistance and flexibility of the dustproof layer are improved and the adhesive force of lunar dust is reduced by synthesizing the modified fluorosilicone resin, and the base material adaptability of the lunar dust prevention coating is effectively improved through the composite structure design of the dustproof layer and the matching layer, so that the lunar dust prevention coating can be suitable for the surfaces of various organic and inorganic system thermal control coatings. The influence on the performance of the original thermal control coating is small, the construction is convenient and fast, the process adaptability is good, the solar absorptivity of the original thermal control coating subjected to lunar dust prevention treatment is increased to be smaller than or equal to 0.02, the hemispherical emissivity is reduced to be smaller than or equal to 0.02, the volume resistivity rho v is smaller than or equal to 109 omega.m, the contamination resistance grade of the dustproof coating is 0 grade, and the gravity or wind power dust removal rate of dust with the particle size of 5-125 microns is larger than or equal to 90%.

The invention relates to medium-entropy inverse spinel multivalent oxygen vacancy synergetic broadband infrared emission ceramic, the general formula of the ceramic is (A1xA2yA3zA4u) Fe2O4, A1, A2, A3 and A4 are any four elements of Mg, Ni, Co, Cr, Mn and Cu, x, y, z and u are equal or approximately equal, x + y + z + u = 1, and the molar ratio of (x + y + z + u) to Fe is 1: 2; the ceramic structure belongs to a cubic system inverse spinel crystal structure, and the space group of the ceramic structure is Fd-3m. The medium-entropy inverse spinel ceramic material is prepared by adopting a mechanical wet grinding method and a rapid Joule heating combined method, has the advantages of high heating speed, high production efficiency, short production period, applicability to automatic operation and the like, and has relatively high solar absorptivity and infrared emissivity; the material can be widely used as an infrared radiation material in the fields of aerospace radiation heat dissipation, industrial heating, human body heat management and the like.

This invention provides a Janus fiber membrane with switchable thermal management functions and its preparation method. The fiber membrane comprises a hydrophilic radiative cooling layer and a hydrophobic radiative heating layer, which are directly composited through an electrospinning process to form a structurally integrated fiber membrane with a strong interfacial bond. The radiative cooling layer is composed of hydrophilic cellulose acetate and alumina nanoparticles, aiming to achieve high solar reflectivity and high-mid-infrared emissivity. The radiative heating layer is composed of hydrophobic cellulose acetate and coated with an Mxene coating. This material has excellent solar absorption and low-mid-infrared emissivity, thereby achieving dual-band, all-scenario thermal regulation. This invention solves the environmental adaptability problem caused by single-band regulation, achieving all-scenario, dual-band synergistic thermal management; and solves the problem of separating thermal management and humidity management functions, achieving coordinated thermal and humidity regulation to improve comfort and cooling efficiency.

According to the method for improving the surface roughness of the reflecting surface of the composite material antenna, a composite material component is trimmed to be below 10m for resin layer spraying, the thickness uniformity of a resin-rich layer is improved, then the thickness of the resin-rich layer is further ground, the thickness of the resin-rich layer is controlled to be about 40m, and the surface roughness of the reflecting surface of the composite material antenna is improved. And the possibility of cracking and deformation risks of the resin in high and low temperature environments is reduced. By adopting the method for improving the surface roughness of the reflecting surface of the composite material antenna, the surface roughness of the reflecting surface of the antenna is reduced to about 130nm by using parameters such as water-sand mixed liquid with different particle sizes, the diameter of the polishing disk, the pressure of the polishing disk, the revolution speed of polishing, the polishing time and the like, and then the surface roughness is improved; therefore, the surface roughness is controlled within a certain range, and the optimal state of the solar absorptivity and reflectivity is achieved.

This invention discloses a space-simulated environment variable-temperature photothermal performance testing device based on steady-state calorimetry: the outer layer of the experimental chamber is a vacuum chamber, and the inner layer is a cryogenic chamber, with gas communication between the vacuum chamber and the cryogenic chamber; before testing, the cryogenic chamber is cooled by a cooling device, and the interior of the experimental chamber is evacuated to a vacuum state by a suction device, so that the interior of the experimental chamber meets the testing environment. A sample installation and adjustment unit is used to install and fix the sample to be tested in the cryogenic chamber. A temperature control unit is used to change the temperature of the sample to be tested. A solar radiation simulation unit is used to simulate sunlight irradiation. When the sample to be tested reaches the preset temperature, the data processing unit records the corresponding vacuum level and the output power of the temperature control unit, and calculates the emissivity of the sample to be tested by combining parameters such as the temperature inside the cryogenic chamber and the radiative area of ​​the sample. This invention achieves continuous and simultaneous measurement of full-spectrum hemispherical infrared emissivity and solar absorptivity from 150K to 450K, with a large temperature range and high measurement accuracy.

The invention belongs to the technical field of magnesium alloy surface treatment, and particularly relates to a magnesium alloy surface white micro-arc oxidation film and a preparation method thereof. Comprising the following steps: preparing an electrolyte containing inorganic base, a film-forming agent, a fluorine-containing coloring agent, a discharge regulator, an auxiliary additive and a surfactant; a magnesium alloy base material serves as an anode, stainless steel serves as a cathode, micro-arc oxidation treatment is carried out in electrolyte, and a magnesium oxide / magnesium fluoride composite film layer, namely the magnesium alloy surface white micro-arc oxidation film, is formed on the surface of the base material by controlling the current density. Through the unique electrolyte formula design and the low-voltage micro-arc oxidation process and the synergistic effect of all the components, the oxidation film prepared on the surface of the magnesium alloy is white, the L value is larger than 85, the solar absorptivity is smaller than 0.3, and application scenes with strict requirements for the whiteness and the solar absorptivity can be met.