38 results about "Coating microstructure" patented technology

The invention discloses an electroplating quality monitoring method, device and equipment for an MLCC capacitor and a medium, and relates to the technical field of MLCC capacitor electroplating. The electroplating quality monitoring method comprises the following steps: firstly, acquiring coating microstructure and ion migration data by adopting X-ray tomography and electrochemical impedance spectroscopy technologies, and performing defect classification in combination with appearance detection data; electroplating process parameters are obtained, and a multi-dimensional feature library is constructed through principal component analysis. Then based on a defect classification result and a feature library, training an improved random forest model to realize multi-defect prediction, screening key process parameters through sensitivity ranking, and establishing defect-parameter association; and then constructing an attribution model to analyze an influence mechanism of process parameters on defects. In actual production, real-time process parameters are input into the prediction model for online quality monitoring; and when defects appear, reversely tracing cause parameters through an attribution model. According to the method, a system of data acquisition, feature fusion, real-time monitoring and defect tracing is formed, and the electroplating quality can be effectively monitored.

The invention provides a lead-bismuth reactor nuclear sampler coating and a preparation method thereof.The preparation method comprises the steps that S3, according to the thickness of a CrAl coating, the bias voltage and target current of multi-arc ion plating equipment are adjusted, the bonding strength of the coating and a base body is optimized, and the target adhesive force reaches the scratch test critical load or above; s4, according to the bonding strength, the nitrogen flow and the air pressure are adjusted, a compact CrAl coating microstructure with the porosity lower than a porosity threshold value is generated, and the quality of the microstructure is detected and verified through a scanning electron microscope; s7, according to the thickness consistency, a screw rod or a pin shaft is selected as a base body part, a CrAl coating is deposited on the surface of the screw rod or the pin shaft to be matched with the sleeve cap, and the gap between the sleeve cap and the shaft part is controlled to be within a gap threshold value; and S10, according to hardness and wear resistance test results, the deposition time and bias voltage are adjusted, the performance of the CrAl coating and the performance of the TiN coating are optimized, and the requirements for long-term corrosion resistance and wear resistance in the lead-bismuth alloy environment are met. According to the invention, excellent performances of long-term corrosion resistance and wear resistance in a high-temperature lead-bismuth environment are realized, and the service life of parts is remarkably prolonged.

The invention discloses a superhard wear-resistant B2 + Laves nanosheet layer eutectic high-entropy alloy coating and a laser cladding controllable preparation method thereof, and belongs to the technical field of high-entropy alloy coatings. The alloy coating is composed of Al, Co, Fe, Ni and Nb according to the atomic ratio of 1: 1: 1: 1: x, x is equal to 0.08, 0.2, 0.4 or 1; the alloy coating is increased to x = 1 along with x = 0.08, the microhardness of the alloy coating is remarkably improved to 907 HV from 477 HV, and the distribution range of eutectic lamellar structure spacing is 100-160nm. By regulating and controlling the atomic ratio of the Nb element in the coating, accurate control over formation of a primary phase and a eutectic structure can be achieved. Along with the increase of the Nb content, the microstructure of the coating is formed by compounding a B2 primary phase and a B2 / Laves nanometer eutectic wafer layer, and is gradually converted into a composite structure of a Laves primary phase and the B2 / Laves nanometer eutectic wafer layer.

This invention belongs to the field of surface modification technology for metallic materials, and discloses a steel-based laser cladding gradient transition layer and its application. The steel-based laser cladding gradient transition layer utilizes rare-earth holmium (Ho) and in-situ TiC nanoparticles for synergistic reinforcement, resulting in a uniform and dense TiC microstructure and significantly improved high-temperature stability. The gradient composite coating employs a three-layer gradient structure—a base layer, a transition layer, and a working layer—to achieve a smooth transition in hardness and high-temperature performance, eliminating interfacial thermal stress concentration and significantly improving interlayer bonding strength and anti-stripping ability. This invention employs a layered laser cladding process to achieve a smooth transition in coating hardness and performance, effectively eliminating interfacial thermal stress concentration and improving coating bonding strength and high-temperature stability. This invention is the first to use Ho in laser cladding gradient coatings, resulting in outstanding grain refinement and grain boundary purification effects, significantly improving coating microstructure uniformity, high-temperature strength, and thermal fatigue resistance. The process is stable and reliable, suitable for industrial strengthening applications in large aluminum alloy die-cast cups.

The application relates to a neodymium-iron-boron magnet surface nano-composite coating optimization method in the field of new materials, which comprises the following steps: according to an optimization scheme for hydrogen embrittlement inhibition, local electroplating parameter adjustment is carried out on a high-porosity area of the coating, multi-layer composite deposition technology is used to optimize the coating structure, and higher uniformity of the coating microstructure data is obtained; according to final coating performance data, relevant index information of mechanical performance decline is obtained, digital evaluation of coating adhesion and strength is carried out by using a preset mechanical performance analysis model, and an optimization result of the mechanical performance is determined; according to the optimization result of the mechanical performance, all process parameters and performance data are input into a database through data integration technology, a traceable process optimization file is formed, and complete neodymium-iron-boron magnet electroplating process technology improvement records are obtained.

The application belongs to the field of aero-engine design, and is a service damage evaluation method for single crystal high-pressure turbine working blades. The method comprises the following steps: firstly, determining the stress and temperature range of each working condition of the actual service single crystal high-pressure turbine working blades; secondly, designing and manufacturing a plurality of blade simulation pieces corresponding to the stress and temperature range of the different working conditions of the actual service single crystal high-pressure turbine working blades to perform a creep interruption test, so as to obtain the corresponding relationship between different temperature-stress and coating, coating-substrate interface microstructure damage; thirdly, comparing the interface microstructure damage atlas and the main phase content with the standard atlas of the blade simulation pieces under different temperatures and stress degrees, and selecting the temperature and stress of the blade simulation piece closest to the actual service single crystal high-pressure turbine working blades as the temperature and stress of the sampling position of the actual service single crystal high-pressure turbine working blades; and finally, evaluating the coating microstructure damage and performance degradation degree, so that the coating microstructure damage degree of the service single crystal high-pressure turbine working blades can be comprehensively and truly evaluated.

This invention discloses a method for preparing ceramic-based composite coatings using a laser-induced self-propagating high-temperature synthesis method based on powder-core wire. This method combines laser filament melting technology with a self-propagating high-temperature synthesis method, utilizing a high-energy laser beam to trigger the periodic self-propagating combustion reaction of the powder-core wire. Using powder-core wire instead of powder as the precursor material for coating preparation effectively reduces the dilution effect of the titanium alloy substrate on the coating microstructure. This method can synthesize ceramic-based composite coatings with a dense and uniform microstructure and microhardness values ​​close to the theoretical values, showing broad application prospects.

The invention provides a collaborative optimization method for a magnetic-thermal composite field assisted laser cladding process. According to the method, a magnetic-thermal composite field-assisted laser cladding device is designed based on an energy field-assisted laser cladding process principle and is used for improving the structure and performance of a coating; the method comprises the following steps: generating a quadratic polynomial regression model on the basis of an RSM method, magnetic-thermal composite field assisted laser cladding process parameters and nickel-based composite coating quality evaluation indexes, performing multi-target optimization on the coating quality evaluation indexes on the basis of the quadratic polynomial regression model and an IMOGWO algorithm, determining a magnetic-thermal composite field assisted laser cladding target process parameter combination, and determining the quality of the nickel-based composite coating. And score calculation is carried out on the target process parameter combination based on an EWM-TOPSIS method to obtain a comprehensive evaluation sequence of the target process parameter combination, so that collaborative optimization of the magnetic-thermal composite field assisted laser cladding process is realized, and the performance optimization efficiency and quality of the nickel-based composite coating are improved.

The invention discloses a laser cladding preparation method of a Ti6Al4V substrate surface high-temperature oxidation-resistant coating, which is characterized in that through a Y-doped MoNbTiZr refractory high-entropy alloy system and in combination with an optimized preparation process, the synergistic improvement of the microstructure, the mechanical property and the high-temperature oxidation resistance of the coating is realized. The addition amount of Y is controlled to be 0.5-2 wt.%, and the high-performance coating is obtained through a four-step method including powder pretreatment, compact preset layer preparation, precise laser cladding and aftertreatment. The coating forms a compact composite oxide film at the high temperature of 800 DEG C, the oxidation resistance is remarkably improved, meanwhile, excellent mechanical property balance is kept, and the coating is suitable for being applied to structural parts in high-temperature environments such as aerospace and the like.

This invention discloses a solution-treated and aging-treated anti-cavitation nickel-titanium alloy coating and its preparation method, belonging to the field of laser cladding coating technology. It includes a pure nickel transition layer and a nickel-titanium alloy coating formed by metallurgical bonding on the surface of a stainless steel substrate. The nickel-titanium alloy coating is formed by high-speed laser cladding of nickel-titanium powder onto the surface of the pure nickel transition layer, followed by solution treatment and aging treatment. Through solution treatment, Ni2Ti4O generated in the laser-clad NiTi coating... x Resolution treatment reduces component and microstructure segregation caused by unbalanced solidification during laser cladding, resulting in a homogenized coating microstructure with a single austenitic B2 phase. Then, aging treatment induces the redeposition of finely dispersed Ni2Ti4O3 within the coating. x Ni4Ti3 reduces the amount of O dissolved in the grains, improves its phase transformation behavior, and adjusts it to a suitable phase transformation range, thereby giving it a suitable critical stress for inducing phase transformation and a high resistance to dislocation movement, thus reducing cavitation damage and improving its resistance to cavitation.

The application belongs to the technical field of SiC ceramic matrix composite materials, and discloses an HfSiO4 bonding layer material with a coated microstructure for EBC and resistant to TGO corrosion, a preparation method and application thereof; the preparation method is as follows: HfO2 powder is uniformly mixed with silica sol, then wet ball milling is performed to obtain a slurry; the slurry is dried and ground to obtain a mixed powder; the mixed powder is ground after high-temperature sintering to obtain the HfSiO4 bonding layer material with the coated microstructure for EBC and resistant to TGO corrosion. The process flow of the application is simple, the process is highly feasible, and raw materials are easy to obtain; the environmental barrier coating material prepared by the application is resistant to TGO corrosion, has a thermal expansion coefficient similar to that of SiC / SiC composite material, and the thermal expansion coefficient is adjustable; the anti-dry air oxidation resistance is excellent, and the water-oxygen corrosion resistance is high.

In one aspect, the present disclosure provides nano and microstructures of conducting polymers which may be used in the treatment of neuron regeneration. In some embodiments, the microstructures may be a microcup or a nanogroove structure. The present disclosure also provides methods of preparing the conducting polymer coated microstructures and methods of using these compositions or structures.

The invention discloses a thermal barrier coating microstructure segmentation method, system and device, a medium and a product, and relates to the field of microstructure automatic characterization, and the method comprises the steps: obtaining an image data set of a thermal barrier coating; according to the image data set, based on a U-Net encoder-decoder architecture combined with multi-scale feature extraction and a space attention mechanism, determining an unmelted region model; the unmelted region model is used for determining an unmelted region segmentation map and a confidence score of each pixel; segmenting a to-be-segmented high-resolution electron microscope image by adopting the trained segmentation model and the trained unmelted region model respectively; fusing the unmelted region segmentation map and the segmentation result according to the confidence score determined by the trained unmelted region model to obtain a thermal barrier coating microstructure segmentation result; according to the invention, high-precision automatic segmentation of the complex microstructure of the thermal barrier coating can be realized.

The invention discloses a cutter with a multi-layer nano coating and a preparation method thereof.The cutter comprises a cutter base body and the multi-layer nano coating arranged on the surface of the cutter base body, and the multi-layer nano coating sequentially comprises a transition layer, a functional layer and a protective layer from inside to outside; the functional layers comprise wear-resistant layers and lubricating layers which are alternately arranged, and the uppermost layer and the lowermost layer in the functional layers are the wear-resistant layers. According to the preparation method, the transition layer, the functional layer and the protective layer are sequentially deposited on the surface of the tool base body through the atomic layer deposition technology. Through reasonable combination of the structures of all the layers, the wear resistance, the lubricity and the corrosion resistance of the coating are synergistically optimized by referring to enamel materials, and the cutting performance of a cutter is improved (for example, the wear rate is reduced, and the service life is prolonged). Meanwhile, the atomic layer deposition technology is adopted, the problem of coating microstructure and performance optimization is solved, performance damage of traditional chemical and physical vapor deposition to a tool base body is avoided, and the stress concentration phenomenon between coatings is improved.

The invention relates to the technical field of coatings, and discloses a heat-resistant anticorrosive coating and a preparation method thereof. The coating is prepared from the following raw materials in parts by weight: 20 to 40 parts of polysiloxane resin, 10 to 25 parts of polyamide-imide resin, 8 to 20 parts of a coupling agent, 2 to 10 parts of a modified silane monomer, 150 to 220 parts of zinc powder, 0.75 to 4.4 parts of a silane coupling agent, 30 to 60 parts of glass flakes, 5 to 20 parts of nano zirconium oxide, 2 to 6 parts of a dispersing agent, 2 to 6 parts of a rheological additive and a solvent, the solvent is a mixture of propylene glycol methyl ether acetate and xylene. According to the invention, the effects of stable microstructure and excellent high temperature resistance and corrosion resistance of the coating are obtained by realizing the interface bonding enhancement of the resin, the metal powder and the inorganic filler and the uniform dispersion of a composite system.

The invention relates to the technical field of surface treatment, and discloses a surface treatment method for improving the performance of a Mini LED display module based on a nano-composite coating, which comprises the following steps: firstly, carrying out plasma cleaning on the surface of the Mini LED display module to remove impurities and introduce active groups, then carrying out interface modification treatment on functional nanoparticles, and after the interface modification treatment, carrying out surface treatment on the Mini LED display module to obtain the Mini LED display module. The preparation method comprises the following steps: preparing a modified nano-particle, preparing a nano-composite coating liquid containing the modified nano-particle, applying the nano-composite coating liquid to the surface of the Mini LED display module in an electrostatic spraying manner after the preparation is finished, carrying out 80-100 DEG C medium-temperature thermal curing after the treatment is finished so as to fix a coating microstructure, and finally cooling and finishing the surface treatment. And through medium-temperature thermal curing treatment, the coating effects of uniform crosslinking, adhesive force and long-term stability of nano particles in the coating are achieved, so that the durability and the working stability of the Mini LED display module are improved.

The application discloses a kind of preparation methods of high-precision microstructure coating, comprising the following steps: preparation template: using photo-curing 3D printer utilizes HTL high-temperature light-sensitive resin material preparation includes microstructure template, substrate is washed with anhydrous ethanol and deionized water;Preparation precursor liquid: the solution consisting of film-forming material is added to magnetic nano-substance and wax solution is mixed uniformly to obtain precursor solution;Microstructure coating preparation: the precursor liquid prepared by S2 is poured into template, the whole set of device is placed in magnetic field, solidifies after standing, template is stripped to obtain high-precision microstructure super-hydrophobic coating.The preparation method of the application under the joint action of template, magnetic field and wax, the size precision of coating microstructure prepared is high, and the structure is complete.The method is simple in manufacturing process, and the cost is controllable, and is suitable for mass production.

This invention belongs to the technical field of hot-dip galvanized aluminum-magnesium steel, and discloses a hot-dip galvanized aluminum-magnesium steel with excellent adhesion and its manufacturing method. The chemical composition of the substrate, by mass percentage, includes: C: 0.05-0.07%, Si: 0.05-0.20%, Mn: 0.3-0.5%, Als: 0.025-0.055%, P: 0.025-0.035%, S≤0.010%, Nb: 0.01-0.02%, with the balance being Fe and other unavoidable impurities. The chemical composition of the coating on the substrate, by mass percentage, includes: Al: 12.0-25.0%, Mg: 4.0-10.0%, Si: 0.06-0.5%, Ca: 0.01-0.2%, and the Al / Mg mass ratio ≥2.5, the Al / Si mass ratio: 50-160, with the balance being Zn and other unavoidable impurities. The substrate of this invention is designed with low Si and low Mn composition to ensure coating adhesion, and P and Nb are used to enhance mechanical properties. The plating solution is designed with high magnesium and aluminum composition to ensure high corrosion resistance. The coating microstructure and the composition and morphology of the interface reaction layer between the coating and the substrate are controlled by the Al / Mg mass ratio and Al / Si mass ratio to improve the adhesion of the coating, thereby taking into account both corrosion resistance and adhesion.

The application discloses a cutter with a multilayer nano coating and a preparation method thereof. The cutter comprises a cutter base body and a multilayer nano coating arranged on the surface of the cutter base body. The multilayer nano coating comprises, from inside to outside, a transition layer, a functional layer and a protective layer in sequence. The functional layer comprises alternately arranged wear-resistant layers and lubricating layers. The uppermost layer and the lowermost layer in the functional layer are wear-resistant layers. The preparation method comprises sequentially depositing the transition layer, the functional layer and the protective layer on the surface of the cutter base body by using an atomic layer deposition process. The application utilizes reasonable combination of structures of the layers, learns from enamel to optimize wear resistance, lubricity and corrosion resistance of the coating, and improves cutting performance of the cutter (such as reducing a wear rate and prolonging a service life). Meanwhile, the application adopts the atomic layer deposition technology to solve a problem of optimization of a microstructure and performance of the coating, avoids performance damage of a traditional chemical or physical vapor deposition to the cutter base body, and improves a stress concentration phenomenon among the coatings.

The invention discloses a fast knife servo carving honeycomb micro-lens array back coating structure and a preparation method, and the structure comprises a base material layer which is made of a PET or PC material; the microstructure layer is formed on the surface of one side of the base material layer; wherein the microstructure layer is a honeycomb micro-lens array layer, and the honeycomb micro-lens array layer is formed by closely arranging a plurality of optical units in a regular hexagon honeycomb shape. The method comprises the following steps: step 1, engraving on a processing surface of a copper roller mold by using a sharp knife servo system to form a microstructure with a shape opposite to that of the honeycomb micro-lens array back coating microstructure layer; and 2, the processed roller mold is installed on a UV curing forming machine, the surface of one side of the base material layer is coated with UV light-cured resin liquid, mold microstructure gaps are filled with the resin liquid through extrusion, demolding is conducted after UV light curing, and a microstructure layer is formed on the surface of the base material layer. The back coating structure has the advantages that the light energy utilization rate is high, the haze controllability is good, and the display brightness can be remarkably improved.

The invention relates to the technical field of photovoltaic glass coatings, in particular to an antireflection dustproof coating for photovoltaic glass, coating liquid and a preparation method of the antireflection dustproof coating for the photovoltaic glass. A silicon source is subjected to hydrolytic condensation on the surfaces of polymer particles through a sol-gel method to form core-shell structure particles with a polymer as a core and silicon dioxide as a shell, finally, the core-shell particle dispersion and an acidic silicon dioxide sol adhesive are mixed according to a specific proportion, and the coating liquid for forming a coating is obtained through dilution. The surface of pretreated photovoltaic glass is coated with the coating liquid, after preheating and high-temperature tempering calcination, an antireflection dustproof coating can be formed on the photovoltaic glass, the microstructure of the coating is accurately regulated and controlled through a template method, the high light transmittance and the super-hydrophilic self-cleaning function are achieved, and the anti-reflection dustproof coating can be formed on the photovoltaic glass. And meanwhile, the coating has the characteristics of high hardness, good adhesive force, excellent durability and the like.

The invention relates to the technical field of performance prediction, in particular to a nickel-based composite coating wear resistance prediction method and system based on machine learning. Multi-source data such as workpiece surface features, coating microstructures, process parameters and future working conditions are integrated, and an intelligent prediction model based on a multi-layer perceptron is constructed; according to the method, accurate prediction and early warning of the wear-resistant life of the nickel-based composite coating are realized, a complex nonlinear relation can be learned from historical data, weak links of the coating performance can be recognized in advance, the predictability and accuracy of quality control are improved, the equipment maintenance cost and the shutdown risk caused by coating failure are remarkably reduced, and the service life of the nickel-based composite coating is prolonged. And a reliable decision basis is provided for optimizing a spraying process and prolonging the service life of a workpiece.

The invention discloses a YSZ thermal barrier coating with a controllable non-through pore structure and a preparation method of the YSZ thermal barrier coating, the YSZ thermal barrier coating is formed by YSZ ceramic composite powder through plasma spraying, and the YSZ ceramic composite powder is formed by mixing the following components in percentage by mass: 20-30% of nanocrystalline agglomerated YSZ powder, 20-30% of nanocrystal agglomerated YSZ powder, 5-10% of nanocrystal agglomerated YSZ powder, 5-10% of nanocrystal agglomerated YSZ powder, 5-10% of nanocrystal agglomerated YSZ powder, 5-10% of nanocrystal Micron YSZ (Yttria Stabilized Zirconia) powder accounting for 20 to 30 percent; hollow spherical YSZ (Yttria Stabilized Zirconia) powder accounting for 40%-60%; the porosity of the coating ranges from 6% to 12%, the pore structure is non-through, and pores are distributed in an isolated mode and are not communicated. According to the preparation method, the nanocrystalline agglomerated YSZ powder, the micron YSZ powder and the hollow spherical YSZ powder are mixed, a porous coating microstructure with non-communicated pores is realized through a plasma spraying technology, and the prepared coating has excellent heat resistance, comprehensive mechanical properties and good economical efficiency.

The present application relates to the technical field of pressure measurement, and particularly relates to a highly sensitive wearable pressure sensor based on an ultrathin gold nanometer coating microstructure. The pressure sensor comprises, from top to bottom, an upper packaging layer, a three-dimensional gold nanometer coating microstructure layer, a wire layer and a lower packaging layer; the wire layer comprises a flexible substrate and a conductive circuit formed on the surface of the flexible substrate; the three-dimensional gold nanometer coating microstructure layer comprises a three-dimensional elastic microstructure substrate, the surface of the three-dimensional elastic microstructure substrate is provided with a plurality of three-dimensional elastic microstructures, the three-dimensional elastic microstructures are in a convex shape, and the surface of the three-dimensional elastic microstructures is coated with an ultrathin gold nanometer coating; the ultrathin gold nanometer coating is in contact with the conductive circuit to form an electric current. The pressure sensor has the advantages of simple structure, high sensitivity and good response stability.

The present application relates to the technical field of performance prediction, especially to a nickel-based composite coating wear resistance prediction method and system based on machine learning, the present application integrates multi-source data such as workpiece surface characteristics, coating microstructure, process parameters and future working conditions, and constructs an intelligent prediction model based on multilayer perception, realizing accurate prediction and early warning of the wear life of the nickel-based composite coating, the method can learn complex nonlinear relationships from historical data, identify weak links in coating performance in advance, not only improve the predictability and accuracy of quality control, but also significantly reduce the equipment maintenance cost and downtime risk caused by coating failure, providing a reliable decision basis for optimizing the spraying process and prolonging the service life of the workpiece.

The invention belongs to the technical field of metal coatings, and discloses a nickel-based coating and a preparation method and application thereof.The preparation method of the nickel-based coating comprises the following steps that a nickel-based alloy serves as a raw material, flame spraying is conducted on the surface of a base material, and a preliminary nickel-based coating is obtained; the preliminary nickel-based coating is subjected to remelting treatment through laser heating, and the nickel-based coating is obtained; wherein the nickel base alloy is Ni (nickel)-20Cr (chromium)-10TiC (titanium carbide). Specific Ni-20Cr-10TiC nickel-based alloy is selected as a raw material, flame spraying and laser remelting processes are matched, the microstructure of the nickel-based coating is remarkably optimized through laser remelting treatment, the porosity is greatly reduced to block corrosion medium permeation, meanwhile, the bonding efficiency of the coating and a base material is enhanced, and the corrosion resistance of the coating is improved. The nickel-based coating can stably adapt to severe working conditions such as high temperature and strong corrosion, and the nickel-based coating is promoted to be expanded in industrial high-end application scenes.

Sputtering machines and substrate holders for such systems are described which include one or more magnets apart from the magnets typical of sputtering guns. The added magnets produce a magnetic field bias which is a new means for controlling depositional flux, ionization degree of a sputtered species, and microstructure properties of deposited coatings. An exemplary substrate holder may have a magnet or magnet array near or next to the surface supporting the substrate, and the magnet may assume multiple different magnetic field configurations depending on the desired properties of the resulting magnetic field bias within the reaction chamber.

This invention belongs to the field of metal coating technology and discloses a nickel-based coating, its preparation method, and its application. The preparation method of the nickel-based coating includes the following steps: using a nickel-based alloy as raw material, flame spraying is performed on the surface of a substrate to obtain a preliminary nickel-based coating; the preliminary nickel-based coating is remelted by laser heating to obtain a final nickel-based coating; wherein the nickel-based alloy is Ni-20Cr-10TiC. This invention selects a specific Ni-20Cr-10TiC nickel-based alloy as raw material and combines flame spraying and laser remelting processes. The laser remelting process significantly optimizes the microstructure of the nickel-based coating, greatly reduces porosity to block the penetration of corrosive media, and enhances the bonding efficiency between the coating and the substrate. This enables the nickel-based coating to stably adapt to harsh working conditions such as high temperature and strong corrosion, promoting the expansion of nickel-based coatings in high-end industrial applications.

The present application relates to the technical field of surface modification of TC4 titanium alloy, and particularly relates to a refractory high-entropy alloy coating with three-phase microstructure and a preparation method thereof. The specific technical scheme is as follows: Al, Cr, Nb, Ti and V powders are mixed and ball milled to obtain uniformly mixed powders, the powders are mixed with liquid sodium silicate, and then are placed on the surface of a titanium alloy substrate to form a pre-positioned layer, and then the pre-positioned layer is dried, and the dried pre-positioned layer is subjected to laser cladding to obtain a high-entropy alloy coating. The coating obtained by the present application can form a metallurgical bond with the substrate, and the coating has no obvious porosity defects and a relatively uniform macroscopic morphology; the microstructure of the coating is mainly composed of fine equiaxed crystals, spherical aluminum-rich phases and medium aluminum content particle phases. The high-entropy alloy coating obtained by the present application improves the hardness and friction and wear properties of the titanium alloy, so that the titanium alloy has a wider application prospect in the fields of aerospace, rail transportation or marine vessels.