615 results about "Plasma sprayed" patented technology

The invention discloses a carbon fiber composite material surface modification spraying system and a control method thereof. The system comprises a multi-axis robot, a plasma spray gun, a contact angle measuring probe, a 3D line laser scanner, a hyperspectral imager, an environment sensor and a controller. According to the method, the plasma power and the robot speed are adjusted in real time through contact angle measurement and plasma treatment feedback control, so that the CFRP surface can accurately reach a target value, and the coating adhesive force is improved; 3D line laser scanning and hyperspectral imaging are combined, and the posture, the distance, the wet film thickness and the component uniformity of the spray gun are monitored in real time; based on a prediction model fusing a physical model and a neural network, a self-adaptive fuzzy PID control algorithm is adopted, and the coating flow and the track posture of a spray gun are accurately regulated and controlled in real time. The problems of weak coating binding force, uneven thickness, orange peel, sagging and serious coating waste in traditional spraying are effectively solved, and self-adaptive, high-quality and green spraying of workpieces with complex curved surfaces is achieved.

The invention relates to the technical field of ceramic phase coatings, in particular to a high ceramic phase gradient coating preparation process which comprises the following steps: (1) metal matrix pretreatment; (2) constructing a coating material; (3) plasma spraying; (4) thermal shock strengthening treatment; according to the preparation technology of the high-ceramic-phase gradient coating, through reasonable matching of all the components and optimization of the technology, the performance in multiple aspects is obviously improved. In the metal matrix pretreatment stage, a micro-nano rough surface is constructed by adopting a laser texturing technology, so that the roughness of the surface of the matrix is increased, more mechanical occlusion points are provided for the coating, pollutants and an oxide layer on the surface are removed, the activity of the surface of the matrix is improved, and the bonding strength of the coating and the matrix is remarkably enhanced. Mainly, mechanical interlocking is formed between the rough surface structure and the coating, and chemical bonding between the coating and a base body is promoted through the clean and high-activity surface, so that the bonding strength is greatly improved.

The invention discloses a preparation method and application of a plasma etching resistant coating, and relates to the technical field of coatings. Comprising the steps that a yttrium oxide layer is prepared through a low-pressure plasma spraying method, the yttrium oxide layer comprises a relative porous layer (the porosity is 1%-3%) and a compact layer (the porosity is smaller than 1%) which are sequentially stacked, and the relative porous layer is used for making contact with a base body. By adopting low-pressure plasma spraying, the yttrium oxide layer with controllable coating morphology and thickness can be obtained, and the thermal expansion coefficient mismatch between the substrate and the compact layer can be effectively relieved through the relative porous layer close to the substrate; the compact layer on the surface is uniform in structure, low in porosity, excellent in cohesion strength and excellent in plasma etching resistance, plasma and a matrix can be isolated, and generation of particles in the etching process is avoided. The compact layer and the relatively porous coating are both prepared on the basis of the same powder material and by adopting the same coating deposition equipment, so that the production efficiency can be improved, and the production cost and the pollution risk caused by transfer between production steps can be reduced.

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention discloses a preparation process of a sintering kiln silicon carbide guide roller with thermal shock resistance and high-temperature corrosion resistance. The process comprises the following steps: sequentially carrying out surface pretreatment such as reticulate pattern laser engraving, sand blasting and cleaning and drying on a silicon carbide guide roller substrate; performing plasma spraying on a pure aluminum oxide coating after preheating; carrying out segmented laser remelting on the coating to improve the compactness; and finally, coating the nano silicon carbide slurry, calcining and curing. The thermal shock resistance and the high-temperature corrosion resistance of the guide roller are remarkably improved by enhancing the binding force of the coating through laser engraving, optimizing the density of the coating through laser remelting and combining post-treatment of nano silicon carbide slurry, and the service life of the guide roller in a lithium battery positive electrode material sintering kiln is prolonged.

The invention belongs to the field of material protection, and particularly relates to a method for improving spraying efficiency and adhesive force by adding a binder in the plasma spraying process. The binder comprises one or more of bentonite, silicon dioxide, borax, sodium silicate and aluminum phosphate. The device has the function of quickly melting spraying particles at high temperature and adhering the spraying particles to a spraying substrate, so that the powder spraying efficiency is improved, and the production efficiency is improved. The method comprises the following steps: firstly, carrying out sand blasting treatment on a spraying base material, removing dust and impurities on the surface to enable the roughness to reach 8-10 microns, weighing, and measuring the surface area to be sprayed; and then weighing the binder and putting the binder into a drying oven to be dried at 120 DEG C; the method comprises the following steps: uniformly mixing a binder and an analytically pure nano spraying material according to a certain proportion, and pouring into a plasma spraying raw material tank; and spraying is carried out at the position with the voltage of 30-50 V, the current of 300-600 A, the air pressure of 8 Mpa and the distance of 80-120 mm. The spraying time is 3-5 min, and after spraying is completed, the powder spraying amount is calculated by weighing the mass difference of the base material before and after the base material is weighed. And by adding the binder, the powdering rate is increased from 30.79% to 51.24%, the consumption of spraying materials is greatly reduced, and the working efficiency is improved.

The invention relates to the technical field of thermal protection coatings, and discloses a high-reflection thermal protection coating and a preparation method thereof.LSTN0.125 powder is subjected to spray granulation and then pre-sintered and sieved, and spherical LSTN0.125 ceramic powder is obtained; the alloy substrate is subjected to roughening treatment, and a bonding layer is prepared on the surface of the alloy substrate through the atmosphere plasma spraying technology; the spherical LSTN0.125 ceramic powder obtained in the step S1 is sprayed on the bonding layer through the atmosphere plasma spraying technology, and an LSTN0.125 ceramic layer is obtained; and the LSTN0.125 ceramic layer is subjected to heat treatment, and the LSTN0.125 thermal protection coating is obtained. According to the invention, the LSTN0.125 with high reflectivity is used as a powder raw material of the coating, so that the high reflection performance of the coating in a near-infrared band can be remarkably enhanced, and the effect of isolating high temperature is achieved.

The invention discloses a self-lubricating aluminum coating and a preparation method thereof.The preparation method comprises the steps that molybdenum disulfide is pretreated through a silane coupling agent, tetraethoxysilane mixed liquor is added, the pH is adjusted to be 9-10, a water bath reaction is conducted, and molybdenum disulfide-silicon dioxide microcapsules are obtained after high-temperature strengthening treatment; respectively adding a zinc nitrate solution and a hexamethylenetetramine solution, adjusting the pH value to 10-11, carrying out a high-temperature and high-pressure hydrothermal reaction to obtain zinc oxide nanorods, and carrying out ball milling treatment on the zinc oxide nanorods, microcapsules, stearic acid and zirconium oxide balls under the protection of argon to obtain doped microcapsules; after raw materials are pretreated, the raw materials and a dispersing agent solution are added into a mixer respectively, spraying powder, a pretreated base body and the spraying powder are obtained after mixing treatment, spraying treatment is conducted on the surface of the base body through a plasma spraying method, and the self-lubricating aluminum coating is obtained after vacuum annealing treatment. Therefore, the obtained self-lubricating aluminum coating is low in friction coefficient, high in performance and excellent in self-lubricating property.

The invention relates to the technical field of thermal barrier coatings for gas turbines or aero-engines, and particularly discloses an ultra-thick and strong-bonding double-ceramic-layer thermal barrier coating and a preparation method thereof.The thermal barrier coating is composed of an MCrAlY bonding layer, a YSZ ceramic layer bottom layer and a high-entropy rare earth zirconate ceramic layer surface layer; the MCrAlY bonding layer is prepared through atmospheric plasma or hypersonic flame spraying, YSZ and high-entropy rare earth zirconate spherical powder serve as spraying raw materials, and the thermal barrier coating is prepared through an axial powder feeding high-energy plasma spraying system. The thermal barrier coating has the characteristics of super thickness (the coating thickness is 600-1200 microns), high bonding strength (gt; 19 MPa) and the like.

This invention discloses a composite coating for the tooth surface of an atlantoaxial PEEK interbody fusion cage, relating to the field of medical materials technology. The composite coating for the atlantoaxial PEEK interbody fusion cage comprises a transition layer covering the tooth surface of the atlantoaxial PEEK interbody fusion cage and a hydroxyapatite coating on the surface of the transition layer; the transition layer is obtained by mixing modified nano-hydroxyapatite and modified PEEK; the hydroxyapatite coating is obtained by plasma spraying of nano-hydroxyapatite. This application sets a transition layer between the PEEK and the hydroxyapatite coating, effectively addressing the problem of easy coating detachment due to the difference in physicochemical properties between the PEEK and hydroxyapatite coatings. The composite coating prepared in this application improves the bonding strength between the coating and the substrate, and the prepared material can be used in biological organisms for a long time.

The invention provides partial yttrium-stabilized zirconia powder with a polymorphic pore structure and a preparation method of the partial yttrium-stabilized zirconia powder with the polymorphic pore structure, slurry is prepared by adding a pore-forming agent and adjusting the mass ratio of nano yttrium-stabilized zirconia powder to pore-forming agent powder to a dispersing agent solution to deionized water, then spray granulation is performed, and corresponding parameters are adjusted, so that the partial yttrium-stabilized zirconia powder with the polymorphic pore structure is obtained. And finally, preparing the partially yttria-stabilized zirconia powder with a polymorphic pore structure through a vacuum drying and degreasing calcination process. The coating with the composite pores is prepared by optimizing atmospheric plasma spraying parameters, such as setting plasma working voltage and current, powder feeding parameters and powder feeding speed, and adjusting the powder feeding air quantity and the like. According to the powder, a pore-forming agent and a dispersing agent are reasonably prepared in precursor slurry, and the powder has the advantages of forming a multi-stage pore structure, an internal supporting framework, good sphericity and sprayability and the like through the working procedures of spray granulation, vacuum drying, degreasing, calcination and the like. The powder can be used for preparing a coating with a porous composite structure, and the stability of the coating is remarkably improved.

The invention provides a 1500-DEG C thermal shock and oxidation resistant plasma spraying method for a Si coating on the surface of graphite, coating graphite and application. The method comprises the following steps that the to-be-sprayed surface of a graphite matrix is pretreated; spraying the to-be-sprayed surface by adopting a plasma spraying technology to obtain a Si coating on the to-be-sprayed surface; carrying out heat treatment on the graphite matrix with the Si coating in a vacuum environment by adopting a vacuum heat treatment technology, so that part of solid silicon in the Si coating is molten into liquid silicon or silicon steam, and the liquid silicon or silicon steam permeates into the graphite matrix containing air holes under the action of capillary tubes, so that part of liquid silicon or silicon steam and the graphite matrix are subjected to chemical reaction; and thus, the gradient transition Si / SiC coating is obtained through in-situ growth on the to-be-sprayed surface of the graphite matrix. According to the method provided by the invention, the problem that a traditional method for spraying the Si coating on the surface of the graphite in a plasma manner cannot be used in an environment of 1500 DEG C is solved.

The invention belongs to the technical field of aero-engine materials, and particularly relates to a high-temperature-resistant aero-engine blade and a preparation method thereof.According to the blade, titanium-aluminum alloy is adopted as a base body, and two novel materials including a core-shell structure self-healing reinforcement phase and a rare earth niobate ferroelastic protection compound are introduced, so that the high-temperature-resistant aero-engine blade is obtained; and the comprehensive performance of the blade in a high-temperature environment is remarkably improved. The core-shell reinforcement phase takes titanium diboride as a core and boron nitride as a shell, and can realize a self-healing function at a high temperature; the rare earth niobate compound has ferroelastic behavior and ultralow thermal conductivity through doping modification of tantalum and rhenium. The preparation process comprises the following steps: mixing the titanium-aluminum alloy powder, the reinforcing phase, the silicon carbide short fibers and the binder, carrying out spark plasma sintering molding, carrying out machining, applying the protective coating through plasma spraying, and finally carrying out heat treatment. According to the method, the process is simplified, and the prepared blade has excellent high-temperature resistance, oxidation resistance and mechanical property and is suitable for aero-engine hot end components.

The utility model relates to the technical field of surface processing, and discloses a novel portable plasma spraying device. The spraying device comprises a spraying gun and a spraying mechanism, the spraying mechanism is erected on the spraying gun, the spraying mechanism reduces the temperature of the spraying mechanism by accelerating heat dissipation of cooling liquid and reduces chippings splashing backwards, and a control switch is rotated to control gas flow so as to save gas use. After the gas tank is fixed through the connecting sleeve arranged at the lower end of the connecting pipeline, the connecting sleeve is rotated to enable the clamping block and the clamping groove to be clamped and fixed, so that gas in the gas tank enters the connecting pipeline through the vent hole, and on the contrary, the vent hole is blocked and fixed, and the gas in the gas tank is saved. The cooling groove is connected with the heat dissipation pipe, so that water dissipates heat through the heat dissipation pipe, meanwhile, the heat dissipation fan is arranged inside to accelerate heat dissipation of cooling liquid, and the baffle is arranged at one end of the spray head to reduce backward splashing chippings.

The invention discloses a gradient coating preparation method combined with a gas phase aluminizing process, and relates to the technical field of thermal spraying, and the gradient coating preparation method comprises the following technological processes: S1, carrying out sand blasting treatment on a common gas turbine hot part material GH3536, and then carrying out transferred arc activation treatment on the sand-blasted surface by using vacuum plasma equipment; s2, Ni < 23 > Co < 20 > Cr < 12 > Al < 4 > Ta < 0.6 > Y powder is sprayed; s3, spraying of Ni < 23 > Co < 20 > Cr < 10 > Al < 0.6 > Y powder is conducted; s4, spraying of Ni20Cr10Al powder is carried out; s5, Ni5Al powder is sprayed; s6, a beta-NiAl layer containing an Al2O3 protective film is prepared on the surface of the coating and the surface of the part through the gas phase aluminizing technology; gradient coatings with different components are prepared through atmospheric plasma spraying, and finally a beta-NiAl layer containing an Al2O3 protective film is formed on the surfaces of the gradient coatings through gas phase aluminizing.

The invention provides a micron-scale high-melting-point oxide sheet layer enhanced ultra-high-temperature ceramic-based anti-ablation composite coating and a preparation method thereof.The preparation method comprises the steps that ultra-high-temperature carbide / boride ceramic powder, silicide powder and high-melting-point metal oxide powder are mechanically mixed, and spraying mixed powder with uniform components is obtained; the mixed powder is sprayed on the surface of a base body in a plasma spraying mode, and the ultra-high-temperature ceramic-based anti-ablation composite coating containing a micron-scale oxide lamellar structure is obtained; the lamellar high-melting-point oxide phase is introduced into the ultrahigh-temperature ceramic-based composite silicide coating, so that the problem that the silicon-containing glass phase is easy to lose and splash under high-heat-flow scouring is effectively solved. The high-melting-point oxide sheet layer serves as a physical barrier, can effectively limit flowing of a silicon-containing glass liquid phase in the ablation process and allows gaseous oxidation products to escape at the same time, so that a firmly-attached composite oxide layer is formed, and the oxidation resistance and the anti-scouring and anti-stripping capacity of the coating are greatly improved.

The invention relates to the field of suspension plasma spraying, in particular to a long-service-life suspension plasma spraying thermal barrier coating based on a platinum-aluminum coating and a preparation method of the long-service-life suspension plasma spraying thermal barrier coating. The preparation method comprises the following steps: preparing a vertical crack or columnar-like structure ceramic layer on the surface of a platinum modified aluminide bonding layer with lower roughness by using suspension slurry prepared from fully-stable tetragonal phase yttrium oxide stabilized zirconium oxide powder and adopting suspension plasma spraying suspension, so as to obtain a thermal barrier coating system with long service life. The problems that in the prior art, due to stress existing between a ceramic layer prepared through plasma spraying and a low-roughness platinum modified aluminide bonding layer, cracks are continuously formed and expanded at an interface, and the service life of a thermal barrier coating system is short are solved. The long-life thermal barrier coating system can be prepared on the platinum modified aluminide bonding layer through suspension plasma spraying.

The invention discloses a high-corrosion-resistance yttrium oxide coating for semiconductor equipment and a preparation method of the high-corrosion-resistance yttrium oxide coating, and belongs to the technical field of coatings. According to the high-corrosion-resistance yttrium oxide coating for the semiconductor equipment and the preparation method of the high-corrosion-resistance yttrium oxide coating, a SiC transition layer is formed on the surface of a carbon-containing matrix; and an yttrium oxide ceramic coating is deposited on the SiC transition layer in an SPPS plasma spraying mode. The SiC transition layer is firstly formed on the carbon-containing substrate, then the Y2O3 coating is deposited through solution precursor plasma spraying, and a structure with both interface stability and surface protection is formed. SiC is thermally compatible with a substrate, so that undercut, warping and stripping can be inhibited; the dense Y2O3 layer can form a non-volatile protective phase in fluorine-containing / chlorine-containing plasma, thereby reducing the material removal rate and reducing particle release.

The invention provides an inner hole plasma spraying high-bonding-strength bonding layer and Y2O3 coating material and a preparation technology thereof. The bonding layer comprises a middle transition layer formed after Si and C on the surface of a graphite matrix are subjected to a chemical reaction. The inner hole plasma spraying high-bonding-strength bonding layer provided by the invention is composed of a silicon carbide transition layer generated by in-situ reaction of molten silicon and carbon on the surface of a graphite matrix, and can form a Si-O-M bridged bond with a subsequent ceramic coating, so that interface bonding is converted into chemical bonding from mechanical anchoring, and the bonding strength is improved. And meanwhile, by utilizing the thermal expansion characteristic of silicon carbide between graphite and ceramic, the purposes of buffering thermal mismatch stress step by step on the atomic scale, blocking high-temperature diffusion of carbon elements and endowing the coating with lasting high bonding strength and thermal cycling stability are achieved.

The invention discloses a thermal barrier coating with a vertical columnar crystal structure and a preparation method of the thermal barrier coating. The preparation method comprises the following steps: substrate pretreatment: cleaning, coarsening, activating and pre-oxidizing the surface of a substrate; spraying: preparing a bonding layer of the thermal barrier coating on the pretreated substrate by adopting a plasma spraying or hypersonic flame spraying technology, and preparing a ceramic layer of the thermal barrier coating by adopting the plasma spraying technology; in the ceramic layer spraying process, low-temperature gas is sprayed to the surface of the coating, so that the coating is rapidly cooled, and a vertical columnar crystal structure is formed; performing sol-gel hole sealing: coating the surface of the coating with the sol-gel solution, converting the sol-gel solution into a compact oxide layer through heat treatment, and filling micropores and cracks on the surface; and heat treatment: the coating is subjected to heat treatment, residual stress is eliminated, and the bonding strength and durability of the coating are improved. The strain tolerance, the surface quality and the corrosion resistance of the coating are remarkably improved.

The invention relates to the technical field of steel and discloses a surface corrosion-resistant treatment process for low-carbon steel. The method comprises the steps that S1, matrix steel is taken and cleaned, and a substrate layer is sprayed to the surface of the matrix steel through a plasma spraying method; the base layer comprises the following raw materials: Ni, Fe, Ti and TiO2 in a mass ratio of (70-80): (10-20): (3-8): (1-3); s2, a TiO2 layer is sprayed on the surface of the substrate layer through a plasma spraying method, and pretreated substrate steel is obtained; s3, the surface of the pretreated matrix steel is coated with a sealing coating, curing and drying are carried out, and low-carbon steel subjected to surface corrosion-resistant treatment is obtained; the sealing coating comprises the following raw materials in parts by mass: 100 parts of an organic silicon resin composition, 20-30 parts of modified titanium dioxide, 5-10 parts of composite modified silane and 20-30 parts of acetone.

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 relates to a preparation process of a metal ceramic bionic multilayer film, and belongs to the technical field of metal ceramic films, and the metal ceramic bionic multilayer film comprises a porous metal matrix, a gradient transition layer, a bionic lamination layer and a nanopore separation layer. According to the method, the failure problem of a traditional metal ceramic film under the extreme working condition is systematically solved through the multi-level innovative design, firstly, in the aspects of thermal stress elimination and interface strengthening, a five-layer gradient transition layer structure with the ceramic content changing is adopted, and the plasma spraying-laser remelting synchronous machining technology is combined; the thermal expansion coefficient of the metal matrix and the ceramic layer is continuously and gradually changed, so that the interface thermal stress is effectively reduced, the bonding strength is improved, the problems of cracking and layering under the high-temperature working condition are effectively solved, the service life is effectively prolonged, the structure is strengthened and toughened, and the bionic lamination design simulates the'brick-mud 'structure of a shell pearl layer; the nano-scale metal layer absorbs crack energy, and the ceramic layer provides rigid support, so that the fracture toughness is effectively improved.

The present application relates to a kind of glass fiber CVD monolayer ice-removable composite packaging box manufacturing method, and ethylene etc. Alkenyl substance is converted into graphene at high temperature by CVD method and uniformly deposited on glass fiber cloth (referred to as monolayer), while the monolayer glass fiber cloth is sprayed by plasma with conductive material containing nickel, and positive and negative electrodes are led out, and then the RTM forming method in the field of composite material is used to make packaging box, the purpose of keeping the internal temperature of packaging box constant by Joule heat in use, while the outer surface of packaging box is frozen, it can be melted using heat energy, to achieve the purpose of deicing, and the packaging box can be used as a separate system, so that the packaging box has good environmental adaptability and strong practicability. At the same time, it meets the needs of constant temperature and ice-removable composite packaging box in the field of aerospace or special function.

The invention relates to the technical field of material surface engineering and metallurgical equipment, in particular to a composite coating for prolonging the service life of a crystallizer copper plate and a plasma spraying preparation method thereof.The composite coating comprises, by mass, 35%-55% of chromium, 20%-55% of nickel, 5%-10% of titanium diboride, 0.1%-0.3% of niobium and the balance chromium carbide and inevitable trace impurity elements. According to the invention, titanium diboride and chromium carbide are used as main hard reinforcing phases, so that the coating shows excellent wear resistance at normal temperature and high temperature; a hollow graphite electrode is adopted in the spraying process, plasma arc is generated, and meanwhile an ablation product (carbon) provides a carbon source for formation of chromium carbide; the titanium powder and the boron powder are subjected to an in-situ reaction in a plasma arc to generate titanium diboride, and the in-situ synthesis technology enables hard phase particles to be fine and uniformly distributed, and forms a firm interface with a metal binding phase, so that the problems of interface pollution and weak combination caused by the addition of the hard phase are avoided.

The invention discloses a high-temperature transmission mesh belt antirust layer and a preparation method thereof, and relates to the technical field of metal plating. The method comprises the following steps: firstly, cleaning and hydroxylating the surface of a metal mesh belt, then spraying an ethanol solution of a silane coupling agent, drying, then uniformly spraying a sodium tripolyphosphate solution onto the surface of the metal mesh belt through an atomizing nozzle, and then baking the metal mesh belt at the temperature of 400-640 DEG C, and finally, the Ti-C-Si-B composite powder is sprayed to the surface of the metal mesh belt through plasma spraying, and the high-temperature transmission mesh belt anti-rust layer is obtained after heat preservation. The high-temperature transmission mesh belt anti-rust layer prepared by the invention has excellent high-temperature resistance and excellent adhesive force and also has excellent anti-corrosion and anti-rust performance.

The invention discloses a powder plasma spraying device for an anticorrosive coating of a gas pipeline, and relates to the technical field of spray plating, the powder plasma spraying device comprises a plasma spraying machine, an equipment driving structure is mounted on the outer side of the plasma spraying machine, a gas guide structure is arranged at the bottom of the equipment driving structure, and a supporting structure is mounted on the outer side of the gas guide structure; the air guide structure comprises a second air pump and a second supporting frame, a first annular groove is formed in the top of the second supporting frame, under the action of the airflow belt, a fourth air guide piece, a rubber ring, the second supporting frame and other structures, oxygen around jet flow sprayed out of the discharging end of the plasma spraying machine is extremely little, and particles in the jet flow are prevented from being oxidized in the flying process; and the binding force between particles in jet flow and the gas pipeline and the cohesive force between particles in the coating are guaranteed, the quality of the coating is guaranteed, pores and holes in the coating are reduced, and the compactness of the anti-corrosion coating is improved.

The invention relates to spherical high-entropy carbide powder and a preparation method of a SiC / high-entropy carbide coating. According to the method, normal-pressure carbon thermal reduction synthesis of high-entropy carbides is realized in a common box-type furnace and in an air atmosphere through a local atmosphere isolation structure of'laying graphite paper, upper graphite powder and covering activated carbon ', then a compact SiC transition layer is generated in situ on a substrate by utilizing a two-step method of'plasma spraying of a pure silicon layer and then high-temperature embedding carburization', and the high-entropy carbide is prepared. And finally, the high-entropy carbide coating is prepared through a thermal spraying method. The process is simple, the cost is low, large-scale preparation is easy, the high-temperature wear resistance and the ablation resistance of the coating can be remarkably improved, and the harsh requirements of the aerospace field and the like for the ultra-high-temperature protective coating are met.

The utility model relates to an anti-blocking plasma spraying gun, and belongs to the technical field of plasma spraying, the anti-blocking plasma spraying gun comprises a gantry, a base is fixed at the bottom of the gantry, two electric push rods are fixed on the inner side of the gantry, and stable sleeves are fixed on the opposite sides of the two electric push rods; and a spray gun assembly capable of heating and spraying out powder is arranged on the inner side of the stable sleeve, the left side of the spray gun assembly fixedly communicates with a feeding pipe, and an anti-blocking mechanism capable of preventing powder blocking is arranged at the top of the spray gun assembly. According to the anti-blocking plasma spraying gun, an object to be sprayed is placed at the bottom of the spraying gun assembly, the spraying gun assembly is started, powder enters the spraying gun assembly through a feeding pipe, the powder is heated and sprayed out through the spraying gun assembly, left-right movement is achieved in cooperation with an electric push rod, the spraying effect is further improved, and after spraying is completed, a telescopic mechanism and an anti-blocking mechanism are started; therefore, unused powder is swept out, powder blockage is prevented, and next-time use is facilitated.

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.