532 results about "Alloy coating" patented technology

The invention discloses a wide-temperature-range wear-resistant high-entropy alloy coating as well as a preparation method and application thereof, and belongs to the technical field of wear-resistant materials. The wide-temperature-range wear-resistant high-entropy alloy coating comprises a high-entropy alloy bottom layer and a high-entropy alloy oxide surface layer, the high-entropy alloy in the high-entropy alloy bottom layer comprises at least four elements of Ti, Nb, Cr, Mo, V and Ta; the high-entropy alloy oxide surface layer is formed after high-entropy alloy in the surface area in the high-entropy alloy bottom layer is subjected to in-situ oxidation. The wide-temperature-range wear-resistant high-entropy alloy coating has high hardness and wide-temperature-range mechanical property stability, has excellent wear resistance and corrosion resistance in the range of room temperature to 700 DEG C, and can greatly improve the use performance and prolong the service life of a high-temperature moving part.

The invention relates to the technical field of metal material surface treatment, in particular to a preparation method of a hot galvanizing layer of a hot-rolled high-strength steel plate with high corrosion resistance. Firstly, a hot-rolled steel plate is formed after smelting, continuous casting and hot rolling; secondly, the corrosion-resistant hot-rolled high-strength steel plate is subjected to oil removal through alcohol and then put into a heat treatment furnace into which shielding gas can be introduced for hydrogen reduction; then, the corrosion-resistant hot-rolled high-strength steel plate subjected to hydrogen reduction is placed in a plating assistant agent to be soaked; then, the corrosion-resistant hot-rolled high-strength steel plate soaked with the plating assistant is soaked in a Zn-Al-Mg alloy plating solution for hot dipping; and finally, the hot-rolled high-strength steel galvanized plate obtained after hot dipping is taken out of the plating solution in the high-purity Ar protective atmosphere, and the hot-rolled high-strength steel galvanized plate is placed in a protective cover full of the high-purity Ar protective atmosphere to be naturally cooled to the room temperature. The corrosion resistance of the Zn-Al-Mg alloy coating on the surface of the hot-rolled steel plate can be effectively improved, and meanwhile, compared with other hot galvanizing technologies, the corrosion resistance is higher.

The invention discloses a preparation method of a high-hardness wear-resistant coating, the high-hardness wear-resistant coating comprises FeCoCrNiMn high-entropy alloy powder and TiC powder, the TiC powder accounts for 0%-20% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder, and the mechanical property and wear resistance of the coating material are effectively improved. The high-entropy alloy coating material is used for preparing a coating, and the method is specifically implemented according to the following steps that firstly, the surface of a base material is pretreated; 2, the FeCoCrNiMn high-entropy alloy powder and the TiC powder are subjected to ball milling, mixing and machining; and 3, laser power parameters and the scanning speed are set, the coating is prepared through laser cladding equipment, and the method is used for preparing the high-entropy alloy coating.

The invention belongs to the technical field of surface engineering protective coatings, and discloses a nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating as well as a preparation method and application thereof. The preparation method comprises the following steps that firstly, a magnetron sputtering technology is adopted, a CoCrFeMnNi target serves as a cathode target material, and a corrosion-resistant high-entropy alloy coating is obtained through deposition on the surface of a base body; and then, in a three-electrode system, the corrosion-resistant high-entropy alloy coating is placed in an electrolyte containing a nitrogen heterocyclic onium salt compound to be subjected to electro-deposition, and the nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating is prepared. The corrosion-resistant inorganic-organic hybrid coating prepared by the invention has excellent corrosion resistance, can keep high stability and durability in a complex corrosion environment, and has relatively high corrosion potential and relatively low corrosion current density. The coating can remarkably prolong the service life of a structural base material, is suitable for various harsh working conditions, and provides an efficient and reliable protection solution for industrial application.

The invention discloses a high-entropy alloy wear-resistant coating with a silicon-containing transition layer for improving the wettability of a copper surface and a laser cladding method, and relates to the technical field of alloy coatings. The method comprises the following steps: providing silicon-containing transition layer alloy powder and CoCrFeNiTi series high-entropy alloy powder; providing a copper base material, and cleaning the surface to be cladded of the copper base material; cladding silicon-containing transition layer alloy powder on the surface of the copper base material by adopting a laser cladding process under a protective atmosphere to form a silicon-containing transition layer; and under the protective atmosphere, CoCrFeNiTi series high-entropy alloy powder is cladded on the surface of the silicon-containing transition layer through a laser cladding process, and the high-entropy alloy wear-resistant coating is formed. According to the high-entropy alloy coating disclosed by the invention, the Si element in the transition layer can be subjected to interface reaction with a copper substrate to form a Cu-Si solid solution phase with low interface energy, so that the interface tension between copper and a subsequent cladding coating is remarkably reduced, and the wettability between the copper substrate and a coating material is fundamentally improved; the high-entropy alloy coating is successfully cladded on the copper surface with poor wettability.

The invention discloses a porous high-entropy alloy structure layer for strengthening aluminum / steel heterogeneous interface connection and a selective laser melting forming method of the porous high-entropy alloy structure layer, and belongs to the field of high-entropy alloy materials. The porous high-entropy alloy structure layer comprises FeCoCrNiMn high-entropy alloy and is of a single cubic array stacking structure formed through selective laser melting. The selective laser melting forming method comprises the steps that a porous cubic structure model is designed through Majics three-dimensional software and guided into selective laser melting manufacturing equipment, a metal powder rapid forming system is started, FeCoCrNiMn high-entropy alloy powder is subjected to selective laser melting forming, and the high-strength and high-toughness high-entropy alloy coating is obtained. By effectively controlling the laser power and the three-dimensional model parameters, free energy of an alloy system is effectively reduced, formation of intermetallic compounds is inhibited, the mechanical property of aluminum / steel dissimilar metal connection is improved, and the method has wide application prospects in the aspect of aluminum / steel dissimilar metal connection.

The invention provides a gradient nano composite high-entropy alloy coating system with a self-monitoring function and a preparation method, and relates to the technical field of material surface engineering.The system comprises a functional gradient coating module used for achieving gradient dispersion distribution of nano ceramic particles on the curved surface of a shield hob so as to form a gradient nano composite high-entropy alloy coating; the fiber bragg grating sensing module is used for collecting strain data of the shield hob through a fiber bragg grating sensor integrated on the shield hob; the surface thermal image monitoring module is used for collecting temperature data and image data of the surface of the shield hob through an infrared thermal imager; and the self-adaptive repairing module is used for determining repairing parameters of the shield hob and generating a repairing instruction, so that self-adaptive repairing is carried out on the shield hob through preset repairing equipment according to the repairing instruction. According to the invention, the sensor network is successfully integrated in the gradient coating, and integrated fusion of structural health monitoring and protection functions is realized.

The application discloses a nodular cast iron pipe with a composite coating and belongs to the technical field of metal corrosion prevention, comprising a nodular cast iron pipe base body, a composite outer coating coated on the outer surface of the nodular cast iron pipe base body and an inner coating closely attached to the inner surface of the nodular cast iron pipe base body, characterized in that the composite outer coating comprises an alkali-activated gel layer and a zinc-based coating, the zinc-based coating is arranged between the outer surface of the nodular cast iron pipe base body and the alkali-activated gel layer, the alkali-activated gel layer is an alkali-activated slag fly ash corrosion-resistant gel material, and the zinc-based coating is one or more of a pure zinc coating, a zinc-aluminum alloy coating or a zinc-rich coating layer. The alkali-activated gel layer provided by the application is coated on the inner or outer surface of the pipe and provides further corrosion protection for the nodular cast iron pipe, so that the pipe can be used in extremely harsh construction environments, and has extremely strong weather resistance in acidic soil and overhead fields.

The present application relates to a kind of high-entropy alloy coating for hydrogen blocking and preparation method thereof, belong to and hydrogen pipeline hydrogen damage prevention technical field.The high-entropy alloy coating includes Al, Fe, Cr, Mo, Ti and Pd, and the mass ratio of the total mass of Al, Fe, Cr, Mo and Ti to the mass of Pd is 1-x:x, wherein, 0≤x≤1.The high-entropy alloy target material is obtained by virtue of electric arc smelting advantage, and the high-entropy alloy coating is obtained on the surface of pretreated substrate by magnetron sputtering.The corrosion resistance of high-entropy alloy, the good hydrogen blocking characteristics of alloy formed by Al, Fe, Cr and other elements, and the advantages of Pd in hydrogen storage are perfectly combined to further improve the hydrogen blocking performance of the coating.The high-entropy alloy coating prepared by the method is controllable in composition and performance, and the coating has strong adhesion to the substrate, thereby achieving good hydrogen blocking effect, and the coating prepared by the process is controllable in thickness, which is convenient for performance regulation and testing.

The invention provides a method for preparing a high-entropy alloy coating through an atmosphere plasma spraying and laser remelting composite technology, and belongs to the technical field of surface engineering. The method comprises the following steps that firstly, AlCoCrFeNi high-entropy alloy spraying powder is prepared through a vacuum gas atomization method; then, the surface of the base body is subjected to sand blasting roughening and preheating treatment; then, a high-entropy alloy spraying layer is prepared on the surface of the base body through atmospheric plasma spraying; and finally, the spraying layer is subjected to high-temperature rapid solidification through laser remelting treatment, and the composite coating which is compact in structure and high in bonding strength is formed. By optimizing spraying and remelting process parameters, the problems that a traditional plasma spraying coating is high in porosity and poor in binding force, cracks are likely to be generated in laser remelting and the like are effectively solved, the hardness, compactness and comprehensive performance of the coating are remarkably improved, and the coating is suitable for surface protection of parts under the harsh working conditions of high temperature, abrasion, corrosion and the like.

The invention discloses a laser cladding high-entropy alloy carbide ceramic coating and a preparation method thereof, and belongs to the technical field of high-entropy alloy coatings. A laser cladding technology is adopted, a matrix and high-entropy alloy-phenolic resin composite powder are subjected to in-situ melting through a high-energy laser beam, firm metallurgical bonding between the coating and the matrix is achieved, elements at an interface are in gradient transition, and the shear strength exceeds 100 MPa. The single-layer deposition thickness can reach more than 500 microns and can reach the centimeter level through multi-layer accumulation, so that the coating thickness capability is remarkably improved; the prepared coating is high in compactness, the porosity is lower than 5%, and the key technical contradiction that the thickness and the compactness cannot be synergistically optimized in traditional thermal spraying is effectively solved. Besides, the in-situ carbonization reaction under the methane atmosphere is innovatively adopted, the complex high-temperature synthesis process of traditional high-entropy carbide powder is avoided, the preparation cost is greatly reduced, the preparation period is greatly shortened, and the method has the remarkable advantages of being efficient, low in cost and high in performance.

The invention discloses a nickel-based alloy surface laser cladding coating and a preparation method thereof, and belongs to the technical field of alloy coating preparation. The preparation method of the nickel-based alloy surface laser cladding coating comprises the following steps that MoNiSi / La2O3 powder is subjected to ball milling, and pretreated powder is obtained; the nickel-based alloy base material is subjected to solid solution aging heat treatment, cleaned and dried, and a pretreated base material is obtained; and a binding agent and the pretreated powder are mixed and then laid on the surface of the pretreated base material for laser cladding, then aging heat treatment is conducted, and the nickel-based alloy surface laser cladding coating is obtained. According to the nickel-based alloy surface laser cladding coating, the surface hardness, wear resistance and service stability are greatly improved while the high-temperature strength and toughness of a nickel-based alloy matrix are kept, the service life of key parts such as a turbine disc tenon connection structure can be remarkably prolonged when the nickel-based alloy surface laser cladding coating is applied to the key parts, and the application prospect is wide.

The utility model discloses a supporting tool convenient for preparing a surface coating of a ball core piece, which belongs to the field of alloy coating preparation and is characterized in that a supporting sleeve is sleeved on a working connecting rod, an adjusting screw hole and a positioning screw hole are arranged on the supporting sleeve, and a positioning screw is used for connecting the supporting sleeve with the working connecting rod through the positioning screw hole; the adjusting screw is detachably connected into the adjusting screw hole through a thread; the operation ball core piece is arranged on the supporting sleeve in a sleeving mode, and the inner surface of the operation ball core piece abuts against the top end of the adjusting screw. According to the utility model, two line supports are matched with one central point support and conform to the equilateral triangle design principle, so that the gravity center of the tool and the gravity center of a working piece are ingeniously overlapped together, and the eccentricity ratio is reduced, thereby reducing the coating defects caused by eccentricity and jumping in the coating preparation process and improving the coating quality of products.

The invention provides a pulse-direct current electrochemistry composite deposition process of a nickel-tungsten-phosphorus alloy coating, and belongs to the technical field of coating preparation, and the pulse-direct current electrochemistry composite deposition process comprises the following steps: carrying out silane coupling agent modification treatment on alpha-aluminum oxide; carrying out modification treatment on the hexagonal boron nitride nanosheet by adopting hexadecyl trimethyl ammonium bromide; carrying out polyacrylic acid modification treatment on the nano silicon dioxide; nickel salt, tungsten salt, phosphorus salt, a complexing agent, a buffering agent, a primary brightener, a secondary brightener, a wetting agent, modified aluminum oxide, modified boron nitride, modified silicon dioxide and deionized water are mixed, stirred and heated, and a composite plating solution is obtained; the substrate serves as a cathode, pulse current is applied to the substrate for pulse electroplating, then the current density of the pulse current is continuously and linearly reduced to a target value, and finally direct current electroplating is conducted under the target value; by optimizing the formula of the composite plating solution and the pulse-direct current composite electroplating process, the nickel-tungsten-phosphorus alloy composite plating layer with high hardness, low friction, high wear resistance and corrosion resistance is finally obtained.

Disclosed is a laser welded joint (2). When two steel plate base materials are butt-jointed for laser welding, a laser welding solder is added to a molten pool, thereby forming an initial weld seam, and the initial weld seam is quenched to form the laser welded joint (2), wherein at least one steel plate is a steel plate having an aluminum coating or an aluminum alloy coating; the volume fraction of lath martensite (21) in the laser welded joint (2) is not less than 90%, the average mass fraction of Mn is not less than 3.2%, the average mass fraction of Al is not higher than 1.4%, and the average mass fraction of C is lower than the C content of the steel plate base materials; and the height h1 of a reinforcement on the front face of a final weld seam formed by the laser welded joint (2) and the height h2 of a reinforcement on the back face of the final weld seam do not exceed 0.4 mm.

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.

The invention relates to the technical field of coating preparation, in particular to a high-entropy alloy corrosion-resistant coating based on machine learning optimization and a preparation method thereof.The preparation method comprises the steps that a preparation data set of the high-entropy alloy coating is constructed, and coating element components, technological parameters and corrosion environment parameters in the preparation data set serve as input characteristics; taking the thickness, the hardness and the elastic modulus of the corrosion layer as output characteristics, training an artificial neural network model, and establishing a performance prediction model; a multi-objective particle swarm optimization algorithm is adopted, and magnetron sputtering process parameters are optimized and solved by taking the minimum thickness of a corrosion layer and the maximum hardness and elasticity modulus as optimization objectives; according to the optimal process parameter combination, preparing an AlCrFeMoTi high-entropy alloy coating on a ferrite / martensitic steel matrix by adopting a magnetron sputtering five-target co-deposition technology; and carrying out corrosion resistance test on the prepared coating, and comparing a test result with a predicted value of the model to verify the accuracy of the model.

This Sn-Zn alloy-plated steel material has a steel material, a first alloy layer formed on the surface of the steel material and mainly composed of Fe, Cr and Ni, a second alloy layer formed on the first alloy layer and mainly composed of Sn, Fe, Ni and Zn, and an Sn-Zn plating layer formed on the second alloy layer and mainly composed of Sn and Zn, the surface coating rate of the first alloy layer on the surface of the steel material being 70% or more, and the surface coating rate of the second alloy layer on the surface of the steel material being 70% or more. The second alloy layer is an alloy layer mainly composed of at least one of a FeSn2 phase and a Fe3Zn10 phase substituted by a Ni portion, the Sn-Zn plating layer contains 1.0-15.0% by mass of Zn and the balance of Sn and impurities, and the total amount of the first alloy layer, the second alloy layer, and the Sn-Zn plating layer is 5-80 g / m2 per surface.

The invention discloses an organic-inorganic multi-layer composite coating material with functions of promoting cell adhesion, resisting infection and promoting osteogenesis and a preparation method of the organic-inorganic multi-layer composite coating material. The method specifically comprises the following steps: 1) carrying out primary sand blasting treatment on a titanium / titanium alloy sample, then removing an oxide layer on the surface of the titanium / titanium alloy sample by using an ultrasonic oil removal and glow discharge cleaning process, and constructing a copper / zinc alloy coating on the surface of the sample by combining an electrochemical deposition process; 2) carrying out micro-nano processing on the coating by using a secondary sand blasting process to introduce a topological morphology; (3) depositing a polydopamine PDA coating on the surface by using an in-situ auto-polymerization process, and simultaneously dipping to complete the chelation of Fe < 3 + > and PDA; 4) further utilizing an ultrasonic impregnation process to realize conversion from PDA-Fe < 3 + > chelation to PDA-Fe < 3 + >-salvianolic acid b chelation so as to introduce a salvianolic acid b layer, and washing, air-drying and sterilizing to obtain the material. The material has multiple cell adhesion promotion, infection resistance and multiple osteogenesis promotion functions, and can realize innovation of coating technologies in the fields of orthopedics, dentistry and the like.

This invention provides a low-temperature sintering silver paste for solar cells, its sintering method, and its application. The low-temperature sintering silver paste comprises: 70 wt.%–90 wt.% micro / nano silver powder, 5 wt.%–20 wt.% organic carrier, and 1 wt.%–10 wt.% Ni-based coated glass powder; wherein the micro / nano silver powder comprises 60 wt.%–80 wt.% micron-sized silver spheres with a particle size of 1–3 μm and 20 wt.%–40 wt.% nano-sized silver spheres with a particle size of 20–80 nm; the Ni-based coated glass powder consists of Bi-B-Si glass powder and a magnetic Ni-based alloy coating layer coated with the Bi-B-Si glass powder. This invention introduces micro-nano silver powder and Ni-based coated glass powder into the silver paste. The Ni-based alloy coating layer is magnetic, which enhances the magnetic properties of the glass powder. By combining micro-nano silver powder with electromagnetic field composite sintering technology, the silver paste is rapidly and densely sintered at a lower temperature, which effectively improves electrode conductivity, reduces contact resistance, and enhances contact performance with the silicon substrate, thereby improving photoelectric conversion efficiency and shortening sintering time.

A method for inhibiting cracks in laser cladding refractory high-entropy alloy coating and the coating, wherein the method comprises the following steps: surface polishing and cleaning treatment of the substrate to remove oxide film and impurities; preparation of refractory high-entropy alloy powder, the expression of the refractory high-entropy alloy being W a Mo b Ta c X d mixing nickel powder, chromium powder and the refractory high-entropy alloy powder according to mass percentage to obtain mixed powder, wherein the content of the refractory high-entropy alloy powder is 30-70 wt.%, and the ratio of nickel powder to chromium powder is 53:19; and using laser cladding technology to prepare a composite coating with coexistence of gamma phase and BCC hard phase. A series of experiments prove that the method effectively inhibits the coating cracks and widens the application prospect of the coating in the fields of aerospace and military industry.

The invention discloses a martensite reinforced self-lubricating copper-based alloy coating and a laser cladding preparation method thereof, the martensite reinforced self-lubricating copper-based alloy coating comprises the following components in percentage by mass: 66 to 84 weight percent of Cu, 10 to 20 weight percent of Al, 3 to 10 weight percent of Ni, 3 to 10 weight percent of Mn, 0 to 2 weight percent of Sn and 0 to 2 weight percent of Pb. In the preparation process, the laser input energy density is controlled within the range of 8.96-13.27 J / mm, and the double strengthening effects of grain refinement and martensite content increase can be synchronously achieved. The main phase structure of the obtained coating is twin-crystal martensite, meanwhile, the coating contains a small amount of alpha-Cu lubricating phase, gamma phase and Fe-rich hard phase, and the dry friction coefficient of the coating is 1t; 0.35, and the solidification hardness gt; and the voltage is 350HV. Compared with the existing self-lubricating tin-based babbitt metal and copper-tin alloy with similar friction coefficients, the coating disclosed by the invention realizes synergistic improvement of high hardness and low friction performance, and is particularly suitable for dynamic friction and wear working conditions with higher impact resistance requirements, such as robot motion joints, precision mechanical transmission parts and the like.

The internal combustion engine piston capable of reducing abrasion comprises a piston body and a piston head, the piston body and the piston head are fixed, a piston ring groove is formed in the outer wall of the circumference of the piston head, a sealing ring is fixedly connected in the piston ring groove, a plurality of reinforcing rings are fixed in the piston head, the piston body comprises a high-temperature-resistant filling layer, and the high-temperature-resistant filling layer is arranged in the piston ring groove. A high-temperature-resistant filling layer is fixedly connected to the outer side of the plug body, a wear-resistant layer is fixedly connected to the outer side of the high-temperature-resistant filling layer, the high-temperature-resistant filling layer is made of aluminum alloy or nickel alloy, the wear-resistant layer is a dlc coating or a high-silicon aluminum alloy coating, and an assembly hole is formed in the bottom of the plug body. According to the wear-resistant piston, the high-temperature-resistant filling layer and the wear-resistant layer are matched for use, so that the piston body is more wear-resistant and high-temperature-resistant, the service life of the piston is prolonged, meanwhile, the piston and an external device can be connected more tightly through the sealing ring, and the piston head can be firmer and more durable through the reinforcing ring.

The invention discloses a preparation method of a bipolar plate composite coating based on a high-entropy alloy and a conductive polymer, which comprises the following steps: firstly, electro-depositing a layer of high-entropy alloy coating on the surface of a pretreated bipolar plate, and then continuously carrying out electro-polymerization to prepare a polymer coating, thereby forming the composite coating. Through the mode, according to the preparation method of the bipolar plate composite coating based on the high-entropy alloy and the conductive polymer, the comprehensive performance such as corrosion resistance and conductivity of a bipolar plate is effectively improved, the performance requirement for a metal bipolar plate is met, and the preparation method has a wide application prospect in the field of corrosion protection.

The invention relates to the field of alloy coatings, and discloses a high-temperature-resistant alloy protective coating and a preparation method thereof.The protective coating comprises a binder, modified carbon fibers and a composite material; the modified carbon fiber is prepared by forming a carbon coating on the surface of a pretreated carbon fiber by using a glucose aqueous solution through a hydrothermal reaction, and then forming a zirconium dioxide coating on the surface of the carbon coating carbon fiber by using zirconium oxychloride as a zirconium source and hydrogen peroxide as a hydrolysis accelerator through a dipping-cracking process. Wherein the pretreated carbon fiber is prepared by immersing carbon fiber in tantalum disilicide, silicon carbide and alumina sol and carrying out high-temperature calcination; according to the composite material, halloysite nanotubes and chitosan are used for preparing carbon-treated halloysite nanotubes through a hydrothermal method, meanwhile, ferric chloride hexahydrate is introduced, and hot pressing sintering is carried out to prepare the composite material, and the prepared coating is high in hardness, good in abrasion resistance, excellent in high-temperature oxidation resistance, high in bonding strength and good in ablation resistance.

[Problem] To improve the wear resistance of a coating film, which is formed of a Ni-based self-fluxing alloy, in a glass-manufacturing member having the coating film. [Solution] A glass-manufacturing member 1 for conveying or forming glass having a viscosity of logη=3 to 14.6, includes: a body 11 formed of a metal; and a coating film 12 composed of an Ni-based self-fluxing alloy and formed on the surface of the body. The Ni-based self-fluxing alloy contains more than 0 mass% and not more than 3 mass% of P, more than 0 mass% and not more than 5 mass% of Si, and Ni as the remainder in an amount greater than the other components. The metal structure of the coating film includes a first phase and a second phase. The concentration of P in the first phase is higher than the average concentration of P in the entire Ni-based self-fluxing alloy, and the concentration of P in the second phase is lower than the concentration of P in the first phase. In an image obtained by observing the metal structure with a microscope, the range of the area ratio of the second phase in a 10-µm-square region is 0-0.7.

The application discloses a WC+TiC particle reinforced high-entropy alloy coating and a preparation method thereof, and belongs to the field of coating preparation. The coating comprises a bottom layer, and the chemical components and mass percentages of the bottom layer are as follows: carbon: 0.1-0.5%, boron: 1-1.3%, chromium: 19-21%, nickel: 21-24%, silicon: 1-1.5%, molybdenum: 8-10%, cobalt: 22-24%, sulfur: 0.005-0.015%, phosphorus: 0.015-0.045%, and the balance is iron and inevitable impurities; and a working layer, and the chemical components and mass percentages of the working layer are as follows: WC: 15-25%, X: 1.5-4.5%, and the balance of components and the proportion between the components are the same as those of the bottom layer, wherein the X is TiC particles coated with Ni on the surface. The method is used for preparing the coating, and compared with a conventional coating, can effectively improve the wear resistance and corrosion resistance of the coating, and prolong the service life of equipment.

The application discloses an accident-tolerant nuclear fuel cladding coating and a preparation method and application thereof, and belongs to the technical field of nuclear fuel cladding coating. The coating is a Cr-based binary alloy coating deposited on the surface of a zirconium alloy base, and is selected from Cr-Fe, Cr-V or Cr-Mo alloy coatings, wherein the content of Fe is 3-10 wt%, the content of V is 3-20 wt%, and the content of Mo is 1-5 wt%. The preparation method adopts a magnetron sputtering process, and is realized by controlling parameters such as vacuum degree, temperature, gas pressure, bias voltage and power. Through alloying, the application effectively inhibits the element interdiffusion between the coating and the zirconium alloy base at high temperature, reduces the formation of brittle intermetallic compounds and Kirkendall holes, significantly improves the thermal stability and service life of the coating under accident conditions, meanwhile, the process is mature, the coating quality is high, and the coating is suitable for surface protection of zirconium alloy fuel cladding of nuclear power stations.

This invention discloses a laser cladding titanium alloy coating on an aluminum alloy substrate and its preparation method. The invention uses a self-developed small-beam, high-energy ring laser to replace the traditional laser, enabling effective metallurgical bonding between the aluminum alloy substrate and molten titanium alloy powder to form a fusion layer. This fusion layer then facilitates the successful preparation of a high-performance titanium alloy coating on the aluminum alloy surface. The prepared laser cladding coating exhibits a dense overall structure, free from defects such as cracks and pores. The aluminum alloy substrate remains undeformed, demonstrating high interfacial bonding strength and excellent wear and corrosion resistance. It effectively resists the attack of chloride ions from atmospheric and marine environments on the aluminum alloy substrate, thereby significantly extending the service life of aluminum alloy components. This invention overcomes the challenge of preparing titanium alloy coatings on aluminum alloy surfaces using laser cladding, and also provides a new approach and theoretical basis for metal protection, showing promising application prospects.

The invention provides a composite pole piece, a preparation method thereof and a secondary battery. The composite pole piece comprises a current collector and a coating arranged on the surface of at least one side of the current collector, the coating is an alloy coating, and the preparation process of the composite pole piece comprises the following steps: sequentially smelting and cooling raw materials containing a nickel source, a titanium source, a molybdenum source, an aluminum source and a carbon source to obtain a first product; performing heat treatment on the first product to obtain a second product; carrying out atomization treatment on the second product to obtain a powdery third product; and coating at least one side surface of a current collector with the third product to form an alloy coating so as to obtain the composite pole piece. According to the invention, the functional shape memory alloy (SMA) is coated on the current collector as the thermal response coating, so that the purpose of adjusting the gap between the pole pieces in real time according to the temperature change is achieved, and the technical effects of optimizing the heat transfer path in the battery cell, reducing the risk of thermal runaway and improving the overall safety of the battery are achieved.