57 results about "Plasma spray process" patented technology

The embodiment of the invention provides a plastic-coated steel pipe and a plastic coating process thereof, and relates to the technical field of plastic-coated steel pipes. The plastic-coated steel pipe comprises a steel pipe base body, a metal transition layer, an inner anticorrosive coating, a fiber reinforced winding layer and an outer protective coating are sequentially arranged on the outer surface of the steel pipe base body from inside to outside, and the metal transition layer is a nickel-chromium-aluminum-yttrium alloy layer and is formed on the surface of the steel pipe base body through a supersonic plasma spraying process. And the inner anticorrosive coating is formed by a mixture of bisphenol F type epoxy resin and novolac epoxy resin, and is doped with silicon nitride and zirconium oxide composite nanoparticles subjected to surface treatment. By arranging a multi-stage composite structure of the metal transition layer, the high-temperature-resistant anti-corrosion coating, the fiber reinforcement layer and the self-repairing outer layer and arranging the detachable heat insulation sheath, the interface bonding strength, heat resistance, mechanical damage resistance and corrosion resistance of the plastic-coated steel pipe are improved; and the service life of the composite material in high-temperature, strong-corrosion and complex construction environments is effectively prolonged.

The invention provides a method for prolonging the high-temperature service life of a thermal barrier coating of a hydrogen-doped gas turbine. The method comprises the steps that Ni, Co, Cr, Fe, Al, Hf, Si and Y are smelted and cast into master alloy according to the proportion; preparing the mother alloy into high-entropy alloy powder through an inert gas atomization process; high-entropy alloy powder is deposited on the surface of the high-temperature alloy substrate by adopting a high velocity oxy-fuel spraying process, and a bonding layer of the thermal barrier coating is obtained; and preparing a thermal barrier coating on the bonding layer by adopting a plasma spraying process, and carrying out vacuum heat treatment on the thermal barrier coating in advance. The high-entropy alloy bonding layer provided by the invention has better thermal stability, and can still keep strong bonding force between the ceramic layer and the bonding layer alloy after water quenching high-temperature thermal cycle service. And the transition group high-entropy alloy bonding layer is beneficial to formation of a thermal growth oxide layer, has an inhibition effect on diffusion of metal elements and coating degradation in the hydrogen-induced corrosion and high-temperature steam corrosion processes, and can prolong the high-temperature thermal shock service time of the hydrogen-doped gas turbine.

The invention relates to a thermal barrier coating with composite vertical crack collaborative design and a preparation method, and belongs to the technical field of thermal barrier coatings. The coating is composed of a nickel-based high-temperature alloy matrix, an MCrAlY bonding layer, a YSZ first ceramic layer and a multi-element rare earth doped zirconium oxide second ceramic layer containing composite vertical cracks. The second ceramic layer is provided with a penetrating type (the depth is 100%) and non-penetrating type (the depth is 60%-80%) composite crack structure, and preparation can be accurately regulated and controlled by optimizing atmospheric plasma spraying process parameters (such as the preheating temperature of a base body, the powder feeding rate and the moving speed of a spray gun) and controlling the process. According to the double-ceramic-layer thermal barrier coating with the composite vertical crack structure, thermal stress release of the coating can be remarkably improved through collaborative design of the crack structure and material optimization, the thermal shock life can be prolonged by nearly two times at the temperature of 1300 DEG C, CMAS molten salt permeation is effectively inhibited, and excellent heat insulation performance and long-term service stability are achieved.

The invention relates to the technical field of plasma spraying, in particular to metal powder plasma spraying equipment which is characterized in that a nozzle is mounted on a spray gun, a powder conveying pipe is mounted at the nozzle, a plurality of gas conveying pipelines are uniformly arranged on the side wall of the spray pipe around the axis of the spray pipe, and an annular pipeline is fixedly mounted on the outer side wall of the spray pipe; the annular pipeline is communicated with the gas conveying pipeline, the annular pipeline is connected with an argon supply system through a flow guide pipe, an annular groove is formed in the end face, located at the outlet, of the spray pipe, and the gas conveying pipeline is communicated with the annular groove. According to the invention, the metal powder is prevented from leaving the plasma flame due to turbulent flow of the mixed gas, so that the spraying phenomenon is avoided, and the utilization rate of the spraying material of the metal powder plasma spraying process is improved on the premise of ensuring that the production efficiency of the metal powder plasma spraying process is not changed. The invention further provides a metal powder plasma spraying process.

The invention aims to provide an insulating composite ceramic coating with high impact resistance and a preparation method of the insulating composite ceramic coating. The coating is based on nano-agglomerated AlO-3 wt.% TiO composite powder; a double-stage atmospheric plasma spraying process is adopted to directly prepare on a stainless steel substrate under the condition that a metal bonding layer is not prepared in advance: in the first stage, a strong bonding bottom layer is formed at relatively high power, and in the second stage, a nano-structure working layer is constructed at optimized power. In addition, a functional additive accounting for 0.5-3% of the total mass of the powder is externally doped to carry out laser remelting treatment on the coating so as to further densify the coating. Through component compounding and process gradient design, the contradiction that high insulativity and high toughness of the coating are difficult to consider at the same time is successfully solved, and the prepared coating has high hardness, high fracture toughness, high bonding strength and excellent impact resistance and insulation performance; and a long-acting and reliable solution is provided for galvanic corrosion protection of dissimilar metal connecting parts in the marine environment.

The invention relates to the technical field of a plasma spraying process of a high-corrosion-resistance yttrium oxide coating and a gradient structure design method, and particularly discloses the plasma spraying process of the high-corrosion-resistance yttrium oxide coating and the gradient structure design method. The invention aims to solve the problems that a traditional plasma spraying yttrium oxide coating is high in porosity, non-uniform in microstructure, easy to crack and peel off due to mismatch of a thermal expansion coefficient and a metal matrix, and difficult to consider compactness, stress buffering and long-term stability at the same time. The method comprises the following steps: carrying out degreasing cleaning, sand blasting coarsening, ultrasonic oscillation and drying pretreatment on a substrate, carrying out high-corrosion-resistance yttrium oxide composite powder spraying by adopting plasma spraying parameters optimized by an orthogonal test, and arranging multiple layers of intermediate layers with components and thermal expansion coefficients in gradient transition between the substrate and a coating, follow-up heat treatment and nano sol hole sealing treatment are assisted. By adopting the technical scheme, low porosity, high bonding strength, excellent thermal mechanical stability and long-term corrosion resistance in a strong corrosion environment of the coating can be realized.

The application discloses a kind of plasma spraying self-reduction TiC / Ti composite coating and its preparation method and application, belong to thermal spraying coating field, TiC powder, deionized water and binder are mixed and stirred and ball milled, and TiC spherical powder is prepared by spray granulation;Using plasma spraying process, TiC spherical powder is sprayed on substrate, so that TiC occurs self-reduction reaction to generate Ti metal phase, and forms plasma spraying self-reduction TiC / Ti composite coating on substrate;In plasma spraying self-reduction TiC / Ti composite coating, Ti metal phase is distributed between TiC ceramic phase, and forms layered inlay structure.The application uses TiC powder as raw material, and generates Ti metal bonding phase in situ by adjusting and controlling plasma spraying process parameters during spraying process, avoids additional metal bonding phase and subsequent annealing treatment, simplifies process flow and reduces cost.The bonding strength of the prepared plasma spraying self-reduction TiC / Ti composite coating can reach 52.40 MPa at most, which significantly improves the problem of large brittleness and poor interface bonding of traditional TiC coating.

The application relates to the field of metal nanopowder or plasma spraying, and particularly discloses a biliary stent prepared by combining metal nanopowder with a plasma spraying process. The ZrNbFeLa coating prepared by the plasma spraying process has good corrosion resistance, but the hemolysis rate is poor. Further, a proper amount of metal Ti is injected into the ZrNbFeLa coating, so that the biocompatibility of the ZrNbFeLa coating can be significantly improved, the corrosion resistance is not greatly affected, and the ZrNbFeLa coating can meet the use requirements of medical materials such as the biliary stent. It should be noted that the ion injection amount of the metal Ti needs to be controlled within 2.8*10 5 ions / cm 2 -1.2*10 12 ions / cm 2 , otherwise, too much titanium will cause the corrosion resistance of the ZrNbFeLa coating to sharply decrease.

The invention belongs to the technical field of cast iron plating, and particularly relates to a gray iron ductile iron laser cladding interlayer composite material and a preparation method thereof.The interlayer composite material comprises, by weight, 7-10 parts of alloy powder, 0.5 part of boron nitride, 4-6 parts of ceramic powder, 2 parts of flexibilizer, 0.4 part of yttrium oxide and 0.5-1.5 parts of PMMA. A porous ceramic coating is deposited on a gray iron matrix through a plasma spraying process to buffer thermal tension and prevent the risk of gray iron cracking, and then a laser cladding layer comprising a fusion layer and a barrier layer is plated based on a laser cladding process, so that gray iron and ductile iron are matched in thermal expansion, corrosion and brittle rupture are avoided, and the bonding strength and integrity of the bimetallic plate are guaranteed.

This invention provides a method for preparing Ti electrodes by plasma spraying Ce or Eu modified Ti4O7 powder, relating to the field of electrode preparation technology. The method includes the following steps: S1. Taking Ti4O7 powder, weighing the corresponding mass of CeCl3・6H2O or EuCl3・6H2O at a doping ratio of 1 at% to 3 at%, mixing it with the Ti4O7 powder, and then immersing it in ultrapure water; S2. sequentially polishing the Ti substrate with 400-mesh and 600-mesh sandpaper, and ultrasonically cleaning it with deionized water for 20-30 minutes; S3. Using a plasma spraying system, spraying the Ce / Eu-doped Ti4O7 powder obtained in S1 onto the surface of the pretreated Ti substrate obtained in S2. Electrodes prepared by rare earth doping and plasma spraying processes have significantly increased the number of active sites, greatly optimized ammonia nitrogen degradation efficiency, and achieved a tight bond between the coating and the substrate. This enhances the electrode's corrosion resistance and stability, and the preparation process is environmentally friendly, making it suitable for industrial ammonia nitrogen wastewater treatment needs.

This invention provides a plasma spray gun system and a plasma spraying method, relating to the field of low-pressure plasma spraying technology. The system includes: an ultrasonic transducer, a plasma spray gun, an ultrasonic pulse power supply, and an ultrasonic power supply. The ultrasonic transducer has a cavity for coaxially accommodating the plasma spray gun; the ultrasonic pulse power supply serves as the power source for the plasma spray gun; and the ultrasonic power supply serves as the power source for the ultrasonic transducer. This invention solves the problems of insufficient powder kinetic energy, low utilization rate, and low melting rate in low-pressure plasma spraying processes, which limit the controllability of the coating structure. By applying an ultrasonic pulse current to the plasma spray gun and simultaneously introducing an ultrasonic field, the dual-field coupling of arc ultrasound and mechanical ultrasound improves powder utilization and enhances the energy transfer efficiency between the arc, jet, and particles, achieving a synergistic increase in particle kinetic energy and enthalpy, and enabling low-cost, high-efficiency preparation of controllable structure coatings.

The invention relates to the technical field of quartz cavity plasma spraying, and discloses a quartz cavity PTFE plating plasma spraying device and process, and the device comprises a plating part grabbing assembly which comprises a device body, a main grabbing part arranged on the device body, and a rotating part arranged on the device body; the spraying assembly comprises a spraying part movably connected to the equipment body, a turning part arranged on the spraying part and a bearing part arranged on the equipment body, and the bearing part is connected with the main grabbing part; the pretreatment assembly is connected with the equipment main body, the plated part grabbing assembly, the spraying assembly and the pretreatment assembly cooperate to achieve automatic pretreatment, stable grabbing and positioning and multi-direction uniform spraying of the quartz cavity, meanwhile, the adaptability of the plasma spraying process is optimized, the plating quality and stability of a PTFE coating are greatly improved, and the plating quality and stability of the PTFE coating are improved. And the high-precision production requirement is met.

The utility model relates to the field of voice diaphragms, and discloses a voice diaphragm waterproof and dustproof composite structure, which comprises a voice diaphragm body, and a waterproof layer, a buffer layer, a dustproof layer and a reinforcing layer are sequentially laid on the outer surface of the voice diaphragm body from bottom to top. The waterproof layer uniformly covers the surface of the voice diaphragm body by a self-repairing nanoscale polymer waterproof coating material through a vacuum plasma spraying process; the buffer layer is formed by compounding two layers of porous silica gel materials with different pore diameters through an interpenetrating network structure and is arranged between the waterproof layer and the dustproof layer; the dustproof layer is a double-layer electrostatic adsorption type dustproof net, the inner layer is a polyester fiber net, and the outer layer is a polyester fiber net subjected to nano-silver ion treatment; the reinforcing layer is located on the outer side of the dustproof layer and is composed of a high-strength carbon fiber reinforced thermoplastic plastic film with carbon fibers distributed in a three-dimensional staggered mode, and the waterproof and dustproof composite structure of the voice diaphragm meets the requirements of modern consumers for high performance and high reliability of audio equipment in a complex environment.

The present application belongs to the technical field of coating preparation, and relates to a preparation method of a protective coating of an automobile exhaust oxygen sensor chip, which comprises the following steps: first, removing impurities, ultrasonic cleaning with anhydrous ethanol and drying the oxygen sensor ceramic chip; then, preparing an alumina transition adhesive layer by silk screen printing and low-temperature sintering; subsequently, using a plasma spraying process, spraying a superfine pure alumina suspension to form a porous inner layer and spraying molten broken pure alumina powder to form a dense outer layer, and the spraying process is layered and superimposed and interval cooling; finally, releasing residual stress by dust-free slow cooling. The present application adopts a double-layer alumina coating structure of 'porous inner layer+dense outer layer', the porous inner layer buffers thermal stress, and the dense outer layer blocks corrosive medium, effectively solving the problems of insufficient thermal buffering, easy cracking and peeling of the traditional coating, improving the cold and hot impact resistance and long-term reliability of the chip, and the process is controllable and suitable for industrial production.

The present application relates to the technical field of electrode preparation, and particularly relates to a porous catalytic electrode and a preparation method and application thereof. The preparation method comprises the following steps: S1: mixing a first powder and a second powder to obtain a spraying powder; S2: depositing the spraying powder on a substrate electrode to obtain a catalytic electrode; and S3: using alkali liquor to perform dealumination activation on the catalytic electrode; wherein the first powder comprises an aluminum-containing mixed powder and / or an alloy powder, and the second powder is aluminum powder; the particle size of the first powder is 200-400 mesh, and the particle size of the second powder is 450-1500 mesh. By optimizing the composition and particle size of the spraying powder, the present application can improve the adhesion between powders in the plasma spraying process, and finally improve the coating bonding force, and can also improve the catalytic activity of the electrode.

The invention discloses an internal thread aluminum pipe, a preparation method, an aluminum alloy and a heat exchanger, and relates to the technical field of aluminum alloys. Pure zinc is molten through an electric arc spraying or plasma spraying process, the molten zinc is atomized through high-speed airflow, atomized zinc particles are accelerated to be sprayed to the aluminum pipe to form a coating, then preparation is completed through heat treatment, parameters such as the zinc impregnation depth and the zinc layer coverage degree are further strictly limited, and the zinc coating is prepared. The anti-corrosion performance of the manufactured internal thread aluminum pipe is greatly improved, and the requirement for the service life of an air conditioner outdoor unit aluminum pipe condenser is met. In addition, the invention further develops an aluminum alloy with a specific formula, the internal thread aluminum pipe made of the aluminum alloy is matched with the zinc spraying process, and the anti-corrosion performance of the internal thread aluminum pipe is further improved.

The invention belongs to the technical field of plasma spraying, and particularly relates to a plasma spraying process real-time regulation and control system based on image recognition, which comprises a plasma spray gun, a 3D imaging detection film thickness gauge and a high-speed camera which are positioned on the same mounting bottom plate, wherein the plasma spray gun is used for carrying out plasma spraying on a workpiece; the 3D imaging detection film thickness gauge is used for detecting the thickness of the coating; the high-speed camera is used for accurately identifying the positioning mark on the clamp and accurately positioning the workpiece; and the high-speed camera performs real-time photographing analysis on the appearance of the coating in the spraying process, and records and feeds back coordinates of the coating thickness detected by the 3D imaging detection film thickness gauge in real time. According to the method, the defects of response lag, poor consistency, low production efficiency and the like of an existing plasma spraying scheme can be overcome, and the good market application prospect is achieved.

The invention provides an atmospheric plasma spraying method. The atmospheric plasma spraying method comprises the steps that a to-be-sprayed base body is provided; forming a first spraying layer on the substrate by adopting an atmospheric plasma spraying process; defect detection is conducted on the first spraying layer, and a defect area in the first spraying layer is recognized; carrying out laser repairing treatment on the defect area, specifically, carrying out preheating treatment on the defect area by utilizing an auxiliary laser system; the defect area is subjected to melting treatment through a main laser system, so that the coating material of the defect area is in a molten state; and carrying out slow cooling treatment on the molten coating material in the defect area by using an auxiliary laser system. Through the synergistic effect of precise melting of the main laser and precise preheating-slow cooling of the auxiliary laser, a defect area with pores is subjected to double-laser synergistic repair, the temperature difference between a base body in the defect area and a molten pool is reduced, the solidification time of the molten pool is prolonged, the coating is promoted to be converted from a metastable phase to a stable cubic phase, and the porosity of the coating is reduced; the wear resistance and the stability of the coating are improved.

The application discloses a preparation method of corrosion-resistant insulating material, and applies the corrosion-resistant insulating material to the surface of an aluminum profile vertical oxidation clamp. The application optimizes the components and component proportions of the corrosion-resistant insulating material, and after sintering treatment, the sintered body of the crystal grain and the crystal boundary keeps the crystal boundary diffusion in an active state, sufficient material diffusion paths are formed between the particles, the material is densified through the crystal boundary diffusion, the corrosion-resistant insulating material with excellent heat conductivity and corrosion resistance is obtained, the preparation process is simple, and the operability is strong. In addition, the corrosion-resistant insulating material is sprayed to the surface of the aluminum alloy vertical oxidation clamp through a plasma spraying process, the coating formed has not only a remarkable corrosion resistance, reduces the surface chemical corrosion of the aluminum alloy vertical oxidation clamp, but also has excellent wear resistance, thereby prolonging the service life of the aluminum alloy vertical oxidation clamp.

The utility model discloses an anti-offset plasma spraying clamp, which relates to the technical field of spraying clamps and comprises a bottom plate, a vertical plate is mounted on one side of the top end of the bottom plate, a driving motor is mounted on one side of the vertical plate, and the output end of the driving motor penetrates through one side of the vertical plate and is connected with a driving circular gear. A square rod is mounted on the side, away from the driving motor, of the top end of the vertical plate through a bearing, and a reduction circular gear is mounted on the outer side of the square rod. The distance between the clamping blocks is adjusted through stretching and retracting of the electric telescopic rod, so that a workpiece can be fixedly clamped, then the adjusting plate is arranged, the threaded rod can be manually pushed to enable the adjusting plate to deflect, then the threaded block is rotated to limit the deflection angle, and therefore the workpiece can be fixed and clamped. And therefore, the deflection angle of the two adjusting plates can be flexibly adjusted, workpieces in different shapes can be conveniently fixed by the clamping blocks, and the phenomenon of deflection in the plasma spraying process is avoided.

This invention discloses a method for preparing a temperature measurement component on the surface of a gas turbine blade. The method includes the following steps: confirming the measurement point location and lead wire path on the turbine blade; pre-treating the test area with sandblasting; applying a NiCoCrAlY-containing composite insulating underlayer to the test area using plasma spraying; arranging and initially fixing φ0.1mm K-type micro thermocouples on the insulating underlayer; then fixing and surface-treating the measurement points with a zirconia protective coating applied by plasma spraying; finally, performing lead wire conversion at a suitable location on the turbine blade, converting the micro thermocouples into high-temperature resistant insulated compensating wires. This invention optimizes the sandblasting and plasma spraying process parameters through orthogonal experiments, while introducing a NiCoCrAlY-containing composite insulating underlayer material, reducing irreversible damage to the turbine blade body. This improves the coating's service reliability while ensuring temperature measurement accuracy, meeting the core requirements of gas turbine engineering applications.

This invention belongs to the field of material surface modification and thermal spraying technology, and provides a method for preparing a semi-ceramic coating to enhance the bonding strength of a resin surface. The method includes: preparing a composite powder using Al2O3, phenolic resin, and hexamethylenetetramine; for a cured glass fiber reinforced epoxy resin matrix, while preserving the integrity of the internal glass fiber structure, performing laser texturing pretreatment on the matrix surface to form regularly arranged micron-level concave-convex patterns; and using a supersonic plasma spraying process, spraying the composite powder onto the treated matrix surface via external powder delivery to form a semi-ceramic coating. This invention, through synergistic control of the laser texturing morphology and spraying heat input, can achieve dual enhancement of mechanical interlocking and interfacial compatibility. The resulting coating has a bonding strength with the resin matrix of no less than 20 MPa, and the interface is free of ablation or cracks. This method is particularly suitable for aerospace, electronic packaging, and other fields.

This invention discloses a high-entropy carbide single-phase solid solution coating with near-zero ablation resistance at 3000℃, its preparation method, and its application. It primarily addresses the problem of insufficient solid solution between transition metal carbides and unsatisfactory material properties in existing coatings. The process includes: using a high-entropy carbide (TMC) mixed powder as raw material; ball milling the raw material to obtain a slurry; spray granulation to obtain TMC agglomerated powder; sintering and solidifying the powder using a graphite mold via spark plasma sintering; and finally, vacuum plasma spraying to deposit the coating onto the substrate surface, resulting in a sheet-like high-entropy carbide single-phase solid solution coating with porous and cracked structures. After oxyacetylene ablation, low-melting-point oxides are generated, forming a dense glassy ablation layer on the coating surface, achieving near-zero ablation. This invention can obtain an ideal single-phase solid solution coating with near-zero ablation characteristics at high temperatures while effectively reducing process complexity and economic costs.

This invention relates to the field of printing screen processing, and more particularly to a plasma-based printing screen processing technology. Existing printing screens suffer from problems such as film detachment due to insufficient bonding between the PI film and the screen mesh caused by reduced base adhesive during processing. The technical solution includes the following steps: Step 1: Using an inspection machine, residual adhesive dots on the screen are removed with a needle tip to prevent obstruction of subsequent plasma spraying onto the screen mesh surface; Step 2: A release film is placed on the screen surface to prevent damage to areas other than the screen mesh from the sprayed plasma active arc; the plasma spraying process begins using a plasma machine; Step 3: The screen is manually flipped, and Step 2 is repeated to complete the plasma spraying of the screen mesh on the other side. This invention uses a high-frequency plasma active arc to process the screen mesh, which facilitates a thorough bonding between the PI film base adhesive and the screen mesh wire diameter, thereby strengthening the bond and preventing detachment during printing.

The utility model discloses a fixing roller structure, including fixing roller and mounting seat, its characterized in that, the mounting seat designs and has the axle hole with fixing roller and the gasket and carries out the movable assembly through bearing, fixing roller is the metal roller that has the fixing film function layer solidified to the outer surface, fixing film function layer and metal roller still between the setting have the base coat, the base coat is the metal ceramic material of aluminium oxide or nickel chromium alloy and forms through plasma spraying process, and fixing film function layer is formed on the base coat. The utility model discloses through fixing film and fixing roller and make integral type to avoid the problem, such as deviation, easy wrinkle, rupture and paper jam, etc. that the film type fixing film of the previous set appears, and it can also realize the fast heat response, because the fixing film that sprays and forms is close to the fixing roller made of metal, in addition, because the base of hard coating, fixing film function layer can resist physical damage, that is, resistant to paper edge scraping, not easy to break.

The present invention relates to a plasma torch head for the internal coating of rotationally symmetric, asymmetric, or free-form surfaces in concave or convex cavities of components with a distance of 40 mm or more between the surfaces to be coated using a plasma spray process. The plasma torch head includes a cathode (217) with a tip (305) having a surface roughness of Ra 0.2 μm or less, preferably with a groove extending in the cathode's axial direction, and is secured by a self-locking screw thread in the cathode holder (213). Gas-tightness against plasma gas is ensured by one or more high-temperature resistant O-rings (215), one of which prevents gas leakage between the cathode holder (213) and the insulating ring (207), and the other O-ring prevents gas leakage between the insulating ring (207) and the anode (205). The cathode holder (213) is designed with respect to the plasma gas flow such that the plasma gas exit velocity at the holes above the center of the cathode (303) is lower than that at the holes below the center. A plasma torch head constructed as disclosed reduces voltage fluctuations over the torch head's entire operating life, extending its potential useful life.

The invention relates to a multi-component solid solution composite coating and a preparation method thereof. The preparation method of the multi-component solid solution composite coating comprises the following steps: (1) weighing boride / carbide and silicide powder according to the stoichiometric ratio of chemical components of raw material mixed powder, and mixing to obtain the raw material mixed powder; (2) pre-sintering the raw material mixed powder at a high temperature and then carrying out induction plasma spheroidizing sintering to obtain raw material sintered powder to be sprayed; and (3) spraying the raw material sintering powder to be sprayed on a substrate by adopting a plasma spraying process to obtain the multi-component solid solution composite coating.

The present disclosure provides a composite coating and a preparation method thereof, the preparation method comprising: gradient preheating a substrate and a stainless steel powder; forming a stainless steel coating on the surface of the substrate by a laser cladding process using the stainless steel powder; and forming a zirconium-based amorphous alloy layer on the surface of the stainless steel coating by a plasma spraying process using a zirconium-based amorphous alloy powder; wherein the chemical general formula of the zirconium-based amorphous alloy powder is Zr 63 Cu 20‑x Al 10+x Fe5Ti2, wherein 0≤x≤8; and the surface of the zirconium-based amorphous alloy powder is coated with a transition metal oxide layer. The composite coating prepared by the present disclosure forms a Fe-Zr intermetallic compound diffusion bonding layer at the interface, realizes metallurgical bonding, has high interface bonding strength, and has high hardness, low porosity and excellent corrosion resistance as a whole.

This invention provides a plasma-sprayed graphene nanosheet-reinforced Al2O3-20wt%TiO2 coating and its preparation method, relating to the field of surface-protective functionalized coating preparation technology. The preparation method includes: combining graphene nanosheets with Al2O3-20wt%TiO2 ceramic powder to form a composite powder; and using a plasma spraying process, under specific process conditions, spraying the composite powder onto a pretreated substrate surface. Under this process, molten ceramic droplets can effectively coat the graphene nanosheets, forming a "ceramic-coated graphene" composite structure. The graphene nanosheets act as a reinforcing phase, synergistically improving the microhardness and fracture toughness of the coating. This invention solves the problem of traditional ceramic coatings being unable to simultaneously achieve both hardness and toughness, resulting in a coating with excellent overall performance.

The invention relates to the field of pipeline coatings, in particular to a corrosion-resistant anti-scaling coating for a geothermal pipeline and a preparation method thereof.According to the scheme, alloy powder composed of Cu, Ni, Co, Cr, Fe, Al and Mn according to the specific mass percent range is selected as a coating material, a plasma spraying technology is adopted, and specific technological parameters and surface pretreatment and aftertreatment steps are matched, so that the corrosion-resistant anti-scaling coating for the geothermal pipeline is obtained. And a compact single-layer alloy coating with high binding force is formed on the inner wall of the pipeline, so that the problems of single coating function, insufficient binding force and lack of anti-scaling performance in the prior art can be effectively solved.