1386 results about "Coated surface" patented technology

The invention discloses a carbon-coated foil coating uniformity detection method and system based on machine vision, and the method comprises the steps: S1, collecting blue light, green light, red light and near infrared spectrum images of the surface of a carbon-coated foil coating through a multi-angle camera, and generating a fused composite image through a multispectral image fusion algorithm; s2, performing adaptive histogram equalization and reflected light spot suppression processing on the fused composite image, and outputting an enhanced image; s3, coating edge features in the enhanced image are extracted, segmentation of a coating region is realized in combination with a region growing method, and a coating region mask is obtained; s4, extracting multi-scale texture features of the coating region by adopting a pre-trained ResNet-50 deep convolutional network, and constructing a coating surface feature vector; and S5, based on the extracted feature vectors and a standard template library, through a uniformity evaluation model, calculating a uniformity index of the coating, and detecting the uniformity of the coating. According to the invention, accurate detection of the coating uniformity can be realized.

The invention discloses a high-pressure soft water medium treatment and supply system, which belongs to the technical field of seawater desalination treatment, and comprises a multi-dimensional ion detection module for detecting the concentration distribution characteristics of target inhibition ions in original seawater to generate a corresponding coating material selection instruction; the electric field dynamic coupling module captures a termination signal according to the coating material selection instruction; the shock wave generation module starts a main pump to generate fluid shock waves to execute sediment breaking action according to the termination signal; the monitoring module is used for monitoring the finally output softened water ion concentration and reversely calculating the pollution index of the coating surface; and the heat cycle feedback device is used for starting a self-cleaning mode according to the pollution index and transmitting waste heat in the cleaning process to the pump set. The electric field dynamic coupling adsorption and fluid shock wave cooperative treatment technology is adopted, high-efficiency ion capture, dynamic sediment removal and waste heat recycling can be achieved, energy consumption is remarkably reduced, and continuous and stable operation of the system is guaranteed.

The invention relates to the field of battery materials, in particular to a battery cell and an electrochemical device comprising the battery cell, the battery cell comprises a positive pole piece, a negative pole piece, electrolyte and a diaphragm located between the positive pole piece and the negative pole piece; the diaphragm comprises a first coating and a second coating of a base membrane, the first coating is located on the surface of one side of the base membrane and faces the positive pole piece, the second coating is located on the surface of the other side of the base membrane and faces the negative pole piece, and the first coating and the second coating both comprise a first element and a second element; the difference between the mass content ratio b of the first element to the second element on the surface of the second coating and the mass content ratio a of the first element to the second element on the surface of the first coating is controlled to meet a certain range, so that the battery has long circulation and excellent thermal safety performance.

The invention relates to the technical field of skin-touch coatings, in particular to a preparation method of a paint film of an excimer UV skin-touch coating which comprises the following components in percentage by mass: 30%-90% of resin, 5%-40% of monomers, 0.01%-10% of a photoinitiator and 0.01%-10% of an auxiliary agent, the prepared paint film is soft and smooth in surface, low in glossiness, good in wear-resistant effect and good in chemical resistance, the uneven structure formed by the difference of curing of the surface layer and the inner layer of the paint and the effect of microcosmic wrinkles caused by shrinkage of the surface layer achieves the effects that the surface glossiness is low, and the glossiness is lower than 10 degrees when the incident angle is tested to be 60 degrees; and the generated wrinkles are very fine and are naturally generated radians, so that the hand feeling is very smooth, the dynamic friction coefficient of the surface is very low, and the wrinkles on the surface of the coating are caused because the surface curing speed and the bottom curing speed are different, the surface shrinkage is large and the inside shrinkage is small.

The invention discloses a coating thickness detection system and method based on visual monitoring, and relates to the technical field of visual monitoring, and the method comprises the steps: carrying out the preliminary prediction of the coating thickness through geometrical optics; performing coating thickness prediction through a multi-channel neural network based on the pre-processed coating surface image and the preliminary prediction value; according to the predicted thickness of the coating, defect identification and evaluation are carried out, and a final coating thickness and defect comprehensive evaluation result is generated; and real-time feedback is carried out through a flaw comprehensive evaluation result. According to the method, the coating surface image is collected in real time and preprocessed, primary thickness prediction is carried out in combination with geometrical optics, accurate coating thickness prediction is carried out through the multi-channel neural network, and the prediction precision and the adaptive capacity are remarkably improved. Through the defect identification and evaluation module, the type, the shape, the complexity and the position of the coating surface defect are comprehensively considered, and the coating defect is accurately identified and quantitatively evaluated, so that the accuracy and the robustness of defect detection are improved.

The invention discloses a passive radiation refrigeration coating and a preparation method thereof, and relates to the technical field of industrial coatings. Comprising a fluoroacrylate emulsion, hollow glass beads, nano titanium dioxide, flaky silicon dioxide aerogel powder, polytetrafluoroethylene micro powder, hydroxyl-terminated polydimethylsiloxane, a hydroxyl acrylic acid modified silane coupling agent, a super-hydrophobic modified fluorosilicone surface additive, nano cerium oxide, aluminum fluoride doped zinc oxide infrared enhancement powder and deionized water. The paint is prepared on the basis of the formula. According to the invention, a multi-scale spectrum regulation and control and surface self-cleaning system is constructed cooperatively, so that the synergistic effect of high reflection of a sunlight region and high emission of a middle infrared region is realized. The coating can maintain continuous passive refrigeration in a day and night period, the surface of the coating has self-cleaning capability and excellent ultraviolet aging resistance, and high reflectivity and high radiation emissivity can be maintained for a long time in a complex outdoor environment, so that the thermal management efficiency of buildings and equipment is remarkably improved.

The invention provides a photo-thermal super-hydrophobic energy storage material, a preparation method thereof and application of the photo-thermal super-hydrophobic energy storage material in anti-icing and deicing, and belongs to the technical field of anti-icing and deicing. The photo-thermal super-hydrophobic energy storage material provided by the invention comprises an energy storage coating and a photo-thermal super-hydrophobic layer which are sequentially arranged from bottom to top, the energy storage coating comprises the following components: first resin and phase change energy storage microcapsules distributed in the first resin; the components of the photo-thermal super-hydrophobic layer comprise second resin and a photo-thermal inorganic material distributed in the second resin; the surface of the photo-thermal super-hydrophobic layer is provided with a micro-nano structure. Efficient anti-icing / deicing is achieved through the synergistic effect of the photothermal effect, the energy storage characteristic and the super-hydrophobicity, and the result of the embodiment shows that the anti-icing duration of the coating prepared through the method reaches 1.5 times that of a traditional super-hydrophobic surface. Meanwhile, under the illumination condition, the temperature of the coating can be increased to about 50 DEG C within 2000 s, and ice can rapidly fall off from the surface of the coating.

The invention relates to the technical field of coating thickness measurement, in particular to an anti-reflection coating thickness measurement method and system based on a dual-light-path infrared reflection method, and the method comprises the steps: obtaining a reflection signal of a light beam of a measurement light path incident to the surface of a to-be-measured sample coating and a reflection signal of a light beam of a reference light path incident to the surface of a standard sample coating at each moment; performing inversion at each moment to obtain a thickness measurement value of the coating of the to-be-measured sample; collecting reflection spectrum data of the exposed substrate in real time; acquiring a spectral characteristic value and a change degree at each moment; acquiring a predicted thickness measurement error at the next moment of each moment, acquiring a base compensation factor at each moment, and evaluating whether a thickness measurement value at each moment needs to be inversely calculated again or not; if so, constructing a target function at each moment, and optimizing parameters of a Fresnel model of an inversion thickness measurement value at each moment; and carrying out inversion calculation on the thickness measurement value of the coating of the sample to be measured at each moment. The invention aims to improve the stability and precision of the thickness measurement of the anti-reflection coating.

The invention discloses a treatment method for helium holes of an electrostatic chuck, and belongs to the technical field of electrostatic chucks, and the treatment method comprises the following steps: S1, pretreating a gas passage opening and the surface of a substrate: cleaning the helium holes and fine cracks of the substrate, and roughening the surface of the substrate; s2, a ceramic piece is glued to the helium hole opening, wherein the ceramic piece and the side wall of the helium hole opening are tightly attached and bonded together through an adhesive; s3, filling the helium hole ceramic piece with insulating glue: filling holes, cracks and other fine interfaces; s4, grinding the insulation paste filling part to be flush with the surface of the substrate so as to keep the overall flatness; s5, performing meltallizing on the surface of the substrate by using a meltallizing process to obtain the meltallizing coating, uniformly covering the insulating glue filling layer with the meltallizing coating, and forming good combination with the substrate; and S6, grinding and polishing: after the meltallizing coating is completed, grinding or polishing the meltallizing coating to ensure that the surface of the meltallizing coating is smooth.

The invention discloses an anti-corrosion thermal insulation material, a preparation method and application thereof. The coating comprises the following components in parts by weight: 0.1-4 parts of graphene, 5-15 parts of composite microspheres, 10-30 parts of barium sulfate, 10-30 parts of film-forming resin, 18-45 parts of pigments and fillers, 1-8 parts of auxiliaries and 20-50 parts of deionized water. The anti-corrosion and heat-insulating material combines the advantages of graphene, composite microspheres and barium sulfate, and has excellent anti-corrosion performance and heat-insulating performance; the graphene and the composite microspheres can effectively reflect and block heat transfer, so that the temperature of the surface of the coating is reduced; due to the addition of barium sulfate, the stability and mechanical property of the coating are improved, and meanwhile, the corrosion resistance of the coating is enhanced; the preparation process is simple, low in cost and easy for industrial production; and the surface treating agent is suitable for various metal and non-metal surfaces, such as plates, industrial equipment, storage tanks, pipelines and buildings, and has a wide application prospect.

The invention relates to the field of decorative films, in particular to an indented pattern color scraping decorative film and a preparation method thereof.The indented pattern color scraping decorative film comprises a skin feeling functional layer, a pattern developing layer, a supporting strengthening layer and a coloring strengthening layer, the skin feeling functional layer, the pattern developing layer and the supporting strengthening layer are composited into an integrated structure through hot pressing, and micron-sized air guide grooves are formed in the bonding faces of all the layers; the air guide grooves are arranged in parallel along the extending direction of the dimpled grains, the 60-degree glossiness of the surface of the decorative film is less than 3GU, the pencil hardness is greater than 1H, and the texture spacing difference between the outline edge of the dimpled grains and the printed pattern layer is 0.1-0.5 mm, so that the decorative film is endowed with excellent stereoscopic visual effect and physical property. The dimpled grain structure in the skin-touch functional layer is directly formed on the surface of the skin-touch coating, the problem of interlayer dislocation caused by traditional composite embossing is avoided, it is ensured that the dimpled grain outline is clear, the peeling strength between layers is high, bonding is tighter, and no bubble is left on the bonding face between the layers.

The invention relates to the technical field of metal wire processing, and discloses a high-performance metal wire plastic coating process for aerospace engineering, which comprises the following steps: carrying out base material type selection on a metal wire, and carrying out surface treatment of precise cleaning, etching and depth gradient activation; a Ti-Cr alloy and graphene-copper composite transition layer is deposited through a magnetron sputtering technology, and a multi-layer coating structure is formed through electrostatic spraying of a base coating, a fluidized bed dipping function layer and high velocity oxy-fuel spraying of a nano composite coating in sequence; the molybdenum-gold composite sealing layer is prepared by adopting an electric arc spraying technology, and is subjected to vacuum ultraviolet curing enhancement, high-temperature gradient annealing, gradient sintering and vacuum curing treatment; and heat radiation on the surface of the coating is enhanced through laser-induced micro-nano structure regulation and silicon nitride film sputtering. Through collaborative optimization of base material treatment, coating construction, function strengthening and quality control, the interface bonding strength, the comprehensive performance and the environmental adaptability of the spaceflight metal wire coating are remarkably improved, and the service life of the spaceflight metal wire coating is remarkably prolonged.

The utility model discloses a branch line drainage wire clamp, comprising a wire clamp main body and a clamping mechanism, the wire clamp main body comprises a clamping part and a lead wiring part which are in a U-shaped structure, and the branch line drainage wire clamp also comprises a fixing plate and a fixing screw rod. A T-shaped sliding groove is formed in the back face of the clamping part, a first fixing ring is arranged at the top of the fixing plate, and a T-shaped connecting part matched with the T-shaped sliding groove is arranged on one side of the fixing plate. A first screw hole and a second screw hole are formed in the fixing plate and the sliding groove respectively and connected through a fixing screw, and a second fixing ring is arranged on the top of the screw. The clamping mechanism comprises a screw, a clamping block and an operating rod, and an operating handle with a through hole is fixed to the bottom of the operating rod. Silver-based coatings are arranged on the clamping blocks and the clamping parts, and salient points are arranged on the surfaces of the coatings. The lead wiring part and the clamping part are obliquely arranged, and a torque bolt is arranged on the side face of the lead hole. According to the design, through the adjustable fixing plate and the fixing screw rod, the installation flexibility and adaptability are improved, the maintenance work is simplified, and the conductivity and stability are enhanced through the design of the silver-based coating and the protruding points.

The invention relates to the technical field of lamps, in particular to a plating forming process of a lamp. The problems that the interface bonding force of the coating and the matrix is insufficient and the corrosion resistance of the coating is poor are solved. According to the method, micro-arc oxidation is carried out in the pretreatment stage, a compact Al-Si-O ceramic layer is generated on the surface of a high-aluminum matrix in situ, and in combination with deep diffusion of plasma siliconizing, a transition area with gradient Si distribution is constructed; the pitting corrosion resistance of the coating is optimized through the component gradient design of the inner-layer coating, the middle-layer coating and the outer-layer coating; the surface of the coating lamp is subjected to checkerboard scanning by using short pulse laser, so that the porosity and microdefects of the surface of the coating are improved, and the corrosion resistance of the coating is enhanced; a uniform oxynitride passivation film is generated on the surface of the coating in situ through low-temperature plasma post-oxidation-nitridation treatment, the defect that a film layer is easy to strip in a traditional passivation process is avoided, and the corrosion resistance of the material in long-term service can be stably maintained.

The metasurface array antenna housing comprises a plurality of array units of the same structure, each array unit sequentially comprises a first lightning protection layer from top to bottom, and each first lightning protection layer comprises four copper metal cylinders and a lightning protection top layer drainage metal patch; the second metasurface wave absorbing and transmitting layer comprises a first dielectric substrate, and four quasi-rectangular patches, four lumped resistors, four quasi-triangular patches and four quasi-square rings which are arranged on the upper surface of the first dielectric substrate; the third metasurface wave-transparent layer comprises a square metal patch, and a first circular ring and a second circular ring are etched on the square metal patch. Lightning is guided to the third metasurface wave-transparent layer through the first lightning protection layer, the lightning is conducted to other areas through the metal patch, damage of the lightning to the antenna housing is effectively avoided, and the antenna housing can directly replace a lightning protection strip for use; the structural size is greatly reduced, the angle stability is improved, and integration is facilitated; the copper-clad surface of the third metasurface wave-transparent layer can be used as a metal back plate of the second metasurface wave-absorbing layer, and structural multiplexing is achieved.

To provide an epoxy resin composition which is excellent in curability, has high surface hardness of a cured coating film, is excellent in adhesion of the cured coating film, has good appearance of the cured coating film, prevents occurrence of sagging even when an uncured coating film is made into a vertical or inclined state, and is useful as an insulation paste.SOLUTION: An epoxy resin composition contains the following (A) to (C): (A) a urethane modified epoxy resin and / or a polyether modified epoxy resin having an epoxy equivalent of less than 400 g / eq; (B) an imidazole-based compound; and (C) organic modified clay mineral.SELECTED DRAWING: None

The invention discloses a multi-layer circuit board structure based on an AMB technology and a preparation technology, and relates to the field of circuit board preparation, and the preparation technology comprises the following steps: providing a plurality of substrates with coating surfaces, and scanning the coating surfaces through a second laser beam to preheat the substrates, spraying welding flux on the coating surface through a spray head with a first ultrasonic generation module to form a welding flux layer; the surface of the solder layer is scanned through a third laser beam, so that the surface of the solder layer is softened, the solder layer is automatically spread and leveled, and a semi-solid solder layer is formed after cooling; and a plurality of substrates are stacked and fixed through a positioning clamp, then each solder layer is scanned through a fourth laser beam, the solder layers are vibrated by a second ultrasonic generation module, and after the solder layers are cooled and solidified to form welding spots, the multilayer circuit board structure is obtained. Through combination of laser and ultrasonic waves, the thickness of the solder layer is uniform, and the surface is smooth; bubbles and impurities in the solder layer are eliminated through laser and ultrasonic combined melting, and the problems of uneven coating and accumulation and bubbling are avoided.

The invention discloses a bionic anti-drag protective film based on a surface micro-nano structure and a preparation method of the bionic anti-drag protective film, and relates to the technical field of anti-drag film preparation. According to the preparation method, the high-strength nitrogen-containing thermoplastic polyurethane film layer with the flame retardant property is prepared, one layer is coated with the hyperbranched polyurethane coating, the drag reduction functional layer with the microstructure is formed through embossing and photo-thermal dual curing, and the hyperbranched polyurethane coating can form a high-density cross-linked network during curing, so that the drag reduction performance is improved; according to the present invention, the hyperbranched polyurethane coating material has characteristics of good mechanical property and good weatherability, the hyperbranched structure can assist in dispersion of shrinkage stress and maintenance of coating surface flatness during heating, and the hyperbranched polyurethane coating material further contains nitrogen rings so as to provide the coating material with certain fire resistance.

The embodiment of the invention relates to the technical field of batteries, and provides a positive plate and a sodium ion battery, the positive plate comprises a positive current collector and a positive active coating located on at least one surface of the positive current collector; the positive electrode active coating comprises a first active sub-coating and a second active sub-coating, the second active sub-coating is coated on at least one surface of the positive electrode current collector, and the first active sub-coating is coated on the surface of the second active sub-coating; the first active sub-coating comprises a Prussian blue analogue positive electrode material, and the second active sub-coating comprises a layered metal oxide positive electrode material; and the surface resistance of the positive plate is 40 to 1000 m omega. And the needling safety of the sodium ion battery can be effectively improved.

The invention mainly provides a nuclear fuel cladding composite material and a preparation method thereof. The nuclear fuel cladding composite material comprises a zirconium alloy matrix, the niobium-rich diffusion barrier layer is formed on the surface of the zirconium alloy matrix; the Cr coating covers the niobium-rich diffusion barrier layer; and an Al-rich layer formed on the surface of the Cr coating. The preparation method comprises the following steps: firstly, carrying out surface pretreatment on the zirconium alloy matrix; a niobium-rich diffusion barrier layer is formed on the surface of the zirconium alloy matrix through ion implantation; then depositing a Cr coating on the niobium-rich layer; and finally, an Al element is injected into the surface of the Cr coating, and an Al-rich layer is formed so that an Al2O3 protective layer can be formed under the high-temperature working condition. According to the technical scheme, interface mutual diffusion can be effectively inhibited, the stability of the coating is improved, meanwhile, the Cr coating structure is optimized, the oxidation process is delayed, a gradient protection system is constructed, and the oxidation resistance of a high-temperature material is enhanced.

The present invention discloses a preparation method of a photothermal super-hydrophobic coating with excellent anti-icing / de-icing performance under a low temperature and high relative humidity environment, first by in situ growth of photothermal Cu-MOF nanoparticles on the surface of low thermal conductivity fibrous clay mineral nanoparticles, constructing a two-level nano- / nano-structured composite photothermal particle, which is then subjected to low surface energy modification and introduced into a low thermal conductivity binder, and a binder is induced to phase separate to form a micron-scale binder / low surface energy nanoparticle aggregate by a non-solvent, and finally a photothermal super-hydrophobic coating with a three-level micro- / nano- / nano-structure is constructed by spraying. The three-level micro- / nano- / nano-structure of the coating simultaneously gives the coating excellent photothermal performance and the Cassie-Baxter state stability of the droplet on the coating surface under a low temperature and high relative humidity environment, so that it has excellent passive anti-icing / frosting and active de-icing / defrosting performance in this environment. The low thermal conductivity of the coating further suppresses the heat exchange between the substrate-water droplets, so that the passive anti-icing / frosting performance of the coating is further improved. In addition, the present invention has the advantages of simple preparation method and large-area preparation, laying a solid foundation for the practical application of photothermal superhydrophobic anti-icing coatings.

The invention relates to a sample preparation method for coating thickness detection, which comprises the following steps: circularly heating and cooling a base material to obtain a weakly combined base material with a base material body and a coating locally separated; and forming a cut extending along the thickness direction of the coating in a local separation area of the coating of the weak combination base material to obtain a coating section sample vertical to the surface of the base material. Due to the difference of linear cutting expansion coefficients of a base material body and a coating, alternating thermal stress is initiated at the interface of the base material body and the coating through cyclic heating and cooling processes, so that the base material and the coating are controllably and locally separated, a weakly combined base material is obtained, and a cut extending in the thickness direction is prepared in the surface of the locally separated coating. A coating section sample perpendicular to the surface of the base material can be obtained through simple mechanical separation. The method can be used for efficiently preparing a coating sample with clear section and good integrity at low cost on the premise of not depending on expensive or high-damage equipment.

The invention relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a special coating for a large machine tool casting lost foam as well as application and a use method of the special coating. According to the invention, the full-temperature-range functional composite material and the composite aggregate are used for synergistic reinforcement, and mullite is used for high-temperature reinforcement; the temperature-sensitive polymer modified graphite can realize intelligent temperature response of graphite performance; spodumene is used as a thermal expansion adaptive fluxing agent, so that medium-temperature healing and thermal expansion adjustment of a coating system are facilitated; the composite reinforced fibers are reinforced and toughened aiming at large thermal stress of thick and large parts; as an ultralow-temperature glazing agent, the boron-containing glazing agent can form an initial liquid phase at about 450 DEG C to seal the surface of the coating and purify a ventilation channel; the rare earth oxide serving as a high-temperature phase stabilizer can be dissolved in mullite crystal lattices, so that the high-temperature phase stability is improved, and ceramic nodes are refined. Through raw material design, on the premise of ensuring moderate air permeability, the ultrahigh strength and crack resistance of a coating system at extremely high temperature are improved.

The invention discloses a coating and a method for recovering precious metals in a physical vapor deposition process. The coating mainly comprises a silver coating positioned on the lower layer and an organic silicon modified layer positioned on the surface of the silver coating. Before precious metal is recycled, the coating is prepared on the surface of the position where precious metal needs to be recycled in the physical vapor deposition process, after physical vapor deposition is completed, an adhesive tape is adopted to be pasted to the surface of the coating, and then the precious metal is stripped from the surface of the coating in a mode of tearing the adhesive tape; or scraping the surface of the coating by adopting a tool, so that the noble metal is stripped from the surface of the coating, and stripped noble metal chips are collected; and finally, the adhesive tape with the precious metal or the collected precious metal scraps are heated, and the precious metal is recycled from a heating product. According to the method, efficient stripping and efficient recycling of the precious metal can be achieved, the coating has no influence on physical vapor deposition equipment and the technological process, and the method is simple in technology, high in operability, environmentally friendly, free of pollution and high in economical efficiency when the precious metal is recycled and can be applied to the recycling process of the precious metal on a large scale.

The invention relates to an aero-engine thermal barrier coating quality evaluation method based on a terahertz technology. The method comprises the following steps: performing terahertz wave scanning on the surface of a target hot end component, and collecting a terahertz wave reflection time-domain spectrum generated by terahertz waves at a scanning position; determining a peak value region corresponding to the surface of the coating and a peak value region corresponding to the bottom surface of the coating in the terahertz wave reflection time-domain spectrum, determining the thickness of the coating corresponding to the scanning position based on the acquisition time difference of each peak value region, and determining the porosity of the coating corresponding to the scanning position according to the amplitude and phase of each peak value region; target area division is carried out on the surface of the target hot end component, and the coating uniformity corresponding to a target area is determined based on the coating thickness corresponding to each scanning position contained in the target area; and determining a coating quality index of the target hot end component according to the coating thickness and the coating porosity corresponding to each scanning position and the coating uniformity corresponding to each target area. By adopting the method, the coating evaluation cost can be reduced.

The invention discloses a super-amphiphobic flame-retardant ice-resistant coating as well as a preparation method and application of the super-amphiphobic flame-retardant ice-resistant coating with a multi-layer surface coating, and belongs to the technical field of functional materials of electrical equipment. The coating comprises micron-sized ammonium polyphosphate, a nano-sized inorganic filler, fluorinated alkyl silane and a fluorine surfactant, the super-amphiphobic, flame-retardant and ice-resistant coating is constructed through multi-scale components, and the super-amphiphobic, flame-retardant and ice-resistant coating is spontaneously assembled on the surface of a base material in the coating process to form a coating surface with a molecular nanometer, micrometer and macroscopic multi-level structure; the coating shows good super-amphiphobic characteristics, the contact angle of the structure surface after long-time placement under the room temperature condition is basically kept unchanged, the contact angle to water and oil is still larger than 150 degrees after multiple times of cyclic friction and washing, meanwhile, the coating has excellent flame retardance, ice resistance and wear resistance, the icing delay time is greatly prolonged, and the coating has the good anti-freezing effect. And no open fire is generated when the cable is in contact with an external fire source, so that the cable has important engineering application value for electric power facilities under harsh environmental conditions.

The invention discloses a material with a silver coating for low-temperature brazing of brazing filler metal, and particularly relates to the field of brazing welding, which comprises the following steps: silver amalgam paste is prepared by oscillating and mixing silver powder and mercury according to the mass ratio of 1: 9-0.5: 9.5 in a manner and method for plating silver on the surface of base metal (metal, semiconductor, ceramic or glass); when brazing is carried out, the surface of the silver plating layer of the to-be-welded piece is coated with brazing filler metal, and then heating and pressurizing are carried out in a low-temperature interval of 120-350 DEG C in a vacuum, protective atmosphere or atmospheric environment to complete connection. According to the method, the amalgam reaction and isothermal solidification principles are utilized, a tough welding spot mainly comprising a silver-based solid solution is finally formed, generation of a large number of brittle intermetallic compounds is avoided, a connector has high strength, high reliability and excellent thermal fatigue resistance, and therefore the problems that gold-tin brazing filler metal is high in cost, the brittleness of the welding spot is large, and the welding temperature is high are successfully solved.

The invention relates to the technical field of electromagnetic functional materials, in particular to a nested hexagonal resonant structure wave-absorbing metamaterial and a preparation method and application thereof. The wave-absorbing metamaterial with the nested hexagonal resonant structure sequentially comprises a metal resonant layer, a homogeneous wave-absorbing coating and a metal matrix layer, the metal resonance layer is formed by periodically arranging a plurality of metal resonance units on the surface of the homogeneous wave-absorbing coating in an array manner; each metal resonance unit is of a nested hexagonal structure formed by arranging a plurality of structural units, and each structural unit is a hollow hexagonal metal patch. Through the combination of the homogeneous wave-absorbing coating and the metal resonance layer, the wave-absorbing metamaterial with the nested hexagonal resonance structure not only can realize effective absorption of an S wave band under the sub-wavelength scale, but also is beneficial to widening the effective absorption bandwidth and improving the absorption efficiency, simplifies the complex layered stacking framework of a traditional broadband wave absorber from the structural design, and has the advantages of simple structure and low cost. The method has the engineering application advantages of high process adaptability, high preparation feasibility and the like.

The present invention discloses a transparent super-hydrophobic cultural relic protection material and a preparation method thereof. The method first grafts a hydrolyzed silane coupling agent onto the surface of silica, and then utilizes the amino group of the hydrolyzed silane coupling agent to react with the carboxyl group of a chain fatty acid to graft a chain alkyl group onto the surface of silica particles. The prepared material has excellent super-hydrophobicity, a large contact angle of water droplets on the coating surface, and a small rolling angle, making it difficult for water droplets to stay on the coating surface, thereby effectively preventing moisture penetration. At the same time, due to the transparency of the silica particles and the chain fatty acid, the coating can maintain a high transparency and will not block or change the original color and pattern of the cultural relic. The silane coupling agent acts as a bridge connecting the silica particles and the chain fatty acid, which can enhance the chemical bonding inside the coating, making the coating less prone to aging and cracking, and giving the material good high-temperature resistance and the advantage of resisting ultraviolet light, thereby extending the preservation life of the cultural relic.

According to the preparation method of the high-temperature-resistant durable super-hydrophobic powder coating, integrated powder coating particles are prepared by mixing through a tabletting-crushing-sieving technology, and finally, one end of a solid nano-material in the integrated powder coating particles is embedded into a bottom layer, and the other end of the solid nano-material protrudes out of the surface of the coating, so that a nano-fiber bridging interface strengthening structure is formed. According to the invention, the low surface energy material, the solid nano material and the thermoplastic film-forming resin are effectively combined together to construct firm and stable integrated powder coating particles, so that the overall performance is synergistically enhanced, and the protection capability of a micron-scale structure to a nano-scale structure is greatly improved; the solvent-free durable super-hydrophobic powder coating is directly prepared through electrostatic spraying, so that the technological process is simplified; the solid, solvent-free and environment-friendly super-hydrophobic powder coating is prepared, has excellent high-temperature resistance and super-hydrophobic performance, and has potential advantages in the aspect of anti-corrosion and anti-drag application of a heat distribution pipeline.