682 results about "Thermal spray coating" patented technology

The invention discloses a thermal spraying coating thickness online optimization control method based on digital twinning, and relates to the technical field of intelligent manufacturing, and the method comprises the steps: synchronously collecting multi-modal online observation data and process control observation data in a thermal spraying process, carrying out the time-space alignment, and generating a multi-modal observation set; performing adaptive optimization of multi-modal uncertainty gating on the candidate control set according to the credible thickness field confidence distribution map to generate a control instruction sequence; and the control instruction sequence acts on the thermal spraying process, response feedback data are continuously collected in the execution period, a new multi-mode observation set is generated according to the response feedback data, and real-time closed-loop optimization control is kept. According to the method, the thickness field with high credibility and the credible thickness field confidence distribution diagram can be generated through forward generation and uncertainty quantification of physical guidance, and depth coupling of multi-modal data and physical rules and accurate mapping of uncertainty are achieved.

The invention discloses a nanostructure thermal protection coating resistant to long-time high-temperature oxidation and a preparation method thereof.The nanostructure thermal protection coating takes a ceramic matrix composite material as a matrix, and a bonding layer and a composite component coating are sequentially sprayed to the surface of the matrix. Preparing a nano-structure self-healing additive / Re2Si2O7 spherical powder body; preparing a bonding layer on the surface of the ceramic-based composite material serving as a matrix; and 3, depositing the nano-structure self-healing additive / Re2Si2O7 spherical powder on the surface of the bonding layer to form the composite component coating. According to the preparation method, the self-healing additive / Re2Si2O7 is prepared into the nano-structure spherical powder suitable for thermal spraying for the first time, and a method is provided for implementation of the high-performance material on a thermal spraying nano-structure coating. The prepared coating is stable in phase structure at high temperature, phase change of powder is avoided in the spraying process, and the coating has good thermal expansion coefficient matching performance with a base body.

The invention relates to the technical field of atomization powder making, in particular to a plasma rotating electrode atomization powder making system and method based on target particle size powder, and the system comprises a bar chamber used for storing electrode bars; the material pushing chamber is communicated with the bar material chamber, and a material pushing mechanism and a driving mechanism are arranged in the material pushing chamber; and the atomizing chamber is arranged on one side of the material pushing chamber. The powder characteristic monitoring device is used for monitoring the state of the powder for powder making in real time, process fluctuation can be detected in real time, parameters can be adjusted in time, hysteresis of traditional off-line sampling inspection is avoided, different production modes can be switched by controlling the distribution uniformity characteristic and the distribution width characteristic of the powder at the same time, and the production efficiency is improved. For example, the strict requirements of 3D printing for narrow-distribution and high-uniformity powder are met, for example, for wide-distribution powder needed by thermal spraying, the same equipment can achieve higher production flexibility, and diversified production requirements are met.

The invention belongs to the technical field of rare earth thermal spraying, and particularly relates to spherical yttrium oxide powder for thermal spraying and a preparation method of the spherical yttrium oxide powder. The preparation method comprises the following steps: dissolving a yttrium oxide raw material with nitric acid to obtain a yttrium nitrate solution; sequentially carrying out parallel flow reaction, aging, washing and filtering on part of the yttrium nitrate solution and ammonia water to obtain yttrium hydroxide; sequentially carrying out parallel flow reaction, aging, washing and filtering on the residual yttrium nitrate solution and the mixed precipitant to obtain alkaline mixed yttrium; the preparation method comprises the following steps: mixing yttrium hydroxide and alkaline mixed yttrium with water, then adding a dispersing agent and an adhesive step by step, stirring, and carrying out spray granulation to obtain granulated powder; roasting the granulated powder, adding water, carrying out ball milling, then adding the dispersing agent and the adhesive step by step again, and carrying out secondary spray granulation to obtain secondary granulated powder; and sintering the secondary granulation powder at high temperature, and screening. The spherical yttrium oxide powder obtained through the method is high in absolute purity, high in balling rate, good in fluidity, high in apparent density and low in porosity.

The invention relates to a high-temperature electromagnetic functional composite coating and a preparation method thereof, belongs to the technical field of high-temperature electromagnetic functional materials, and solves the problems of narrow absorption frequency band, low absorption loss, poor temperature resistance, poor corrosion resistance, poor environmental medium resistance and poor mechanical property of the existing high-temperature electromagnetic functional coating. From the surface of the substrate from inside to outside, the high-temperature electromagnetic functional composite coating comprises a bonding layer, a protective layer, a functional layer and a surface layer, and the functional layer is made of a thermal spraying composite ceramic material; the multi-layer structure of each layer of the composite coating is mutually coordinated and matched, so that the temperature resistance, the corrosion resistance and the environmental medium resistance of the coating are improved, the electromagnetic wave absorption efficiency is improved, and the service life is prolonged; in addition, the composite ceramic material forming the functional layer has multiple loss mechanisms, the electromagnetic wave absorption frequency band is further widened, and the absorption loss is improved.

The invention relates to the technical field of hydrogen permeation membranes, in particular to a porous metal tube loaded high-entropy alloy hydrogen permeation membrane as well as a preparation method and application thereof. The preparation method comprises the steps that under the inert atmosphere, molybdenum and copper are subjected to mixed ball milling, then cobalt, chromium, iron and nickel are added for mixed ball milling, molybdenum and copper doped cobalt, chromium, iron and nickel high-entropy alloy powder is obtained, then the molybdenum and copper doped cobalt, chromium, iron and nickel high-entropy alloy powder is sprayed to the surface of a porous metal pipe through a supersonic speed hot spraying film making method, and the porous metal pipe is obtained. And a film layer is formed, and the porous metal tube loaded high-entropy alloy hydrogen permeation film is prepared. The high-entropy alloy hydrogen permeation membrane is high in corrosion resistance and suitable for extracting hydrogen from coke oven gas containing much sulfur / carbon impurity gas, and the problems that a conventional compact metal hydrogen permeation membrane is poor in sulfur / carbon resistance and thermal stability are solved.

A method includes receiving, by a computing device, an image indicative of a cross-section of a thermally-sprayed layer. The thermally-sprayed layer defines a porosity comprising a void volume of the thermally-sprayed layer. The image comprises a matrix of pixels, each pixel in the matrix of pixels defining a respective luminance value of a plurality of luminance values. The method includes identifying, based on the luminance values, at least one pixel that is indicative of a void volume in the thermally-sprayed layer. The method includes calculating, based on the at least one pixel that is indicative of the void volume in the thermally-sprayed layer, a total porosity of the thermally-sprayed layer. The method includes determining, by the computing device and based on the at least one pixel that corresponds to a void volume in the thermally-sprayed layer, a quantification of a spatial homogeneity of the porosity of the thermally-sprayed layer.

A manufacturing method of a substrate processing apparatus includes: preparing a main body having a lower end disposed at a first level, having a step formed at a second level higher than the first level, and having an upper end disposed at a third level higher than the second level; forming, by a thermal spray (TSC) method, a first coating from the first level to a height of a fourth level higher than the third level so as to surround the body; forming a bonding unit from an upper surface of the main body to the fourth level; forming a second coating layer on the first coating layer, the second coating layer having a smaller thickness than the bonding unit and a greater hardness than the first coating layer; and arranging a disc on the upper surfaces of the joint unit and the second coating.

The application belongs to the technical field of surface modification, and discloses a method for constructing a ceramic-based self-lubricating, high-wear-resistant and strong-corrosion-resistant coating based on thermal spraying technology and application. The method uses a thermal sprayed ceramic coating as a template, introduces a solid-liquid reversible lubricating phase, and after being heated and melted, the solid-liquid reversible lubricating phase is penetrated into inherent pores and micro / nano cracks in the ceramic coating through a vacuum impregnation process, and is solidified and retained in the defects after cooling, so that a new ceramic-based self-lubricating and strong-corrosion-resistant composite coating is finally obtained. The preparation method is simple, fast and efficient, and does not affect the mechanical properties of the ceramic coating, and the ceramic-based self-lubricating and strong-corrosion-resistant composite coating has low friction coefficient and excellent wear resistance and corrosion resistance.

The invention relates to the technical field of metal powder preparation, and discloses a high-zinc alloy powder preparation method and system.The method comprises the steps of raw material pretreatment and vacuum deep degassing, vacuum melting and active degassing, flow stabilization and diversion and gas-liquid synergistic atomization, solidification and collection under the protective atmosphere, and aftertreatment and packaging under the oxygen-free environment; the system is composed of a vacuum deep degassing unit, a vacuum melting and active degassing unit, a gas-liquid collaborative atomization unit, a powder collecting and cooling unit and an anaerobic operation and packaging unit. The high-quality zinc alloy powder which is low in oxygen content, high in sphericity degree and uniform in component can be stably prepared, and the method is suitable for being applied to the fields of additive manufacturing and thermal spraying.

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 utility model discloses a thermal spraying equipment nozzle cleaning device which comprises a supporting leg and a swing plate, a cleaning box is arranged at the upper end of the supporting leg, a connecting port is formed in the outer wall of the cleaning box, a swing motor is installed in the connecting port, a connecting shaft is installed at the end of the swing motor, and the swing motor is connected with the connecting shaft. The swing plate is arranged at the end of the connecting shaft, a clamping hole is formed in the swing plate, a rubber pad is arranged in the clamping hole, and connecting holes are formed in the outer walls of the left end and the right end of the swing plate. According to the nozzle cleaning device for the thermal spraying equipment, a nozzle is connected with a clamping hole in a clamped mode, the nozzle can be connected with a swing plate, the swing plate is driven by a swing motor to swing, impurities, liquid and other substances in the nozzle can be thrown into the cleaning box through swing force, the nozzle is pretreated, and a drawing cleaning head can be stretched randomly; and the drawing cleaning head can be aligned with the nozzle to carry out water washing work on the nozzle.

The invention discloses metal ceramic MAX-phase composite powder for spraying and a preparation method of the metal ceramic MAX-phase composite powder, and belongs to the field of metal ceramic composite materials. The method comprises the following steps: mixing Ni powder, Cr powder and Cr2AlC nano powder with deionized water, a binder and a dispersant according to a specific ratio, and carrying out wet ball milling to prepare uniform slurry; carrying out spray granulation to obtain primary spherical powder; and finally, carrying out spheroidizing treatment on the primary powder by adopting radio frequency plasma under the protection of inert gas to obtain a final product. The core of the preparation method is that through an optimized two-step process, many limitations in the application aspect of an existing MAX phase material are solved, and the composite powder which is high in sphericity degree, good in flowability, compact in interior and stable in MAX phase component is successfully prepared. The powder can be directly used for thermal spraying, and an ideal raw material is provided for preparing a high-performance MAX-phase metal ceramic coating.

The invention discloses a clamping tool based on a process for preparing a ball core coating through thermal spraying, and belongs to the field of ball core spraying. The clamping tool comprises a limiting screw, a telescopic reset spring, a positioning sliding rail, a positioning guide rail connecting rod, an ejector rod and a ball core part; the limiting screw is in threaded connection with one end of the positioning guide rail connecting rod; the telescopic reset spring is located in the positioning guide rail connecting rod, and one end of the telescopic reset spring abuts against the limiting screw. The positioning sliding rail is located in the positioning guide rail connecting rod and abuts against the other end of the telescopic reset spring. The clamping device for preparing the ball core coating is efficient and accurate, the coaxiality between the ball core and the connecting rod piece is improved, and the clamping device has the advantages of being high in production efficiency and the like. The device is used for producing the coating on the outer surface of the ball core, and the deposition efficiency of the coating on the surface of the ball core can be effectively improved. The device is compact in design, easy to operate and suitable for large-scale production, production cost is reduced, and economic benefits are improved.

The invention discloses a preparation method of a high-wear-resistance tungsten carbide coating for the inner surface of stainless steel, and belongs to the technical field of high-wear-resistance coating materials.The preparation method comprises the steps that a stainless steel sample is put into an electroplating pool to be electroplated, and a middle transition layer is formed on the surface of the stainless steel sample block; and the electroplated stainless steel sample block is subjected to surface cleaning and then placed in a CVD reaction hearth to be subjected to vapor deposition, and a tungsten carbide coating is formed on the surface of the stainless steel sample block. The method solves the problems that the inner surface of the stainless steel cannot be effectively coated, the coating thickness is not uniform, the coating hardness is insufficient and the like through conventional PVD, thermal spraying and other surface treatment processes, preparation of the high-hardness and high-thickness tungsten carbide coating on the inner surface of the stainless steel is achieved, the coating binding force is good, and the coating quality is high. The stainless steel can be widely applied to complex-structure stainless steel parts in the fields of aerospace, power generation equipment, petrochemical engineering 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.

A metal alloy powder composition consisting essentially of Nickel (32 to 42 wt %)-Aluminum (40-50 wt %)-Molybdenum (10-20 wt %)-Boron (0.1-2.0 wt %) in the particle size between 125 to 5 microns range and manufactured as an alloy by gas or water atomization process. This composition reduces the melting point of the alloy and minimizes the oxidation of aluminum in the alloy during thermal spray. This improves the integrity of the coating on electrodes in the alkaline water electrolysis application and the life of electrodes.

The invention relates to a thermal spraying coating preparation process parameter optimization method based on machine learning so as to obtain a high-quality thermal spraying coating. According to the method, a small-sample-size process parameter data set is constructed through high-throughput preparation of the thermal spraying coating, the porosity and long-term soaking corrosion performance of the coating serve as output parameters, and the relevance between the coating preparation process parameters and the porosity and corrosion resistance of the coating is established through a machine learning method; furthermore, more excellent thermal spraying coating preparation process parameters can be predicted in a wider process parameter range, and a high-quality coating can be obtained. The method can be widely applied to rapid optimization of a thermal spraying coating preparation process and stable control of coating quality.

The invention provides a high-temperature-resistant flame-retardant double-component spraying polyurea coating which is prepared from a prepolymer component A and a secondary amine modified chain extender component B. The secondary amine modified chain extender is obtained by reacting hyperbranched polyethyleneimine with carboxylated graphene oxide and ammonium polyphosphate, the modified chain extender has a three-dimensional dendritic structure and amido, the cross-linking density can be improved and the mechanical property can be enhanced by reacting with an isocyanate-containing component, and meanwhile, a rigid structure and a functional group with flame retardance are introduced, so that the polyurea coating has high temperature resistance and flame retardance; the coating has a great application prospect in the aspect of being used as an internal heat insulation spraying polyurea coating.

The invention provides a method for preparing spherical aluminum tantalum alloy powder based on segmented voltage molten salt electrolysis. The method comprises the following steps: mixing Ta2O5 powder with a pore-forming agent and a conductive agent, pressing into a sheet, sintering at high temperature to prepare a Ta2O5 cathode sheet, carrying out segmented electrolysis in cryolite-based molten salt by taking graphite as an anode, and carrying out electrolysis at low voltage in the first stage, so that Ta2O5 is subjected to solid-state electrodeoxidation to be converted into tantalum particles; and then, the voltage is increased, aluminum ions in the molten salt are electrically deposited on the surfaces of the tantalum particles to form metal aluminum, aluminum-tantalum alloying reaction is induced, and the alloy product spontaneously forms spherical particles through the reaction heat release effect. The spherical aluminum tantalum alloy powder has the advantages of being short in technological process and low in cost, and the spherical aluminum tantalum alloy powder is uniform in particle size, high in sphericity degree, good in fluidity and suitable for the technical fields of laser beam / electron beam 3D printing, cladding forming, injection forming, thermal spraying and the like.

The invention relates to the technical field of image data processing, in particular to a thermal spraying coating quality detection system and method based on machine vision, and the method comprises the steps: collecting image index parameters; analyzing the image index characterization value based on the image index parameter; based on a comparison result of the image index characterization value and a preset image index characterization threshold value, determining whether the target sample coating image meets a standard or not; in response to the condition that the coating image of the target sample meets the standard, collecting performance index parameters of the target sample in a historical period; analyzing a performance index characterization value based on the performance index parameter; determining whether the coating quality of the target sample meets a standard or not based on a difference result between the performance index characterization value and a preset performance index characterization threshold value; and in response to the condition that the coating quality of the target sample does not meet the standard, determining a corresponding processing strategy based on a difference value between the performance index characterization value and a preset performance index characterization threshold value. According to the invention, the quality detection efficiency of machine vision is improved through self-adaptive regulation and control.

The invention provides a cold spraying device and a preparation method of an amorphous alloy coating. The cold spraying device comprises a Laval nozzle and a temperature compensation unit. The temperature compensation unit is used for heating the amorphous alloy powder between the expansion section and the matrix to realize temperature compensation; according to the preparation method of the amorphous alloy coating, in the deposition process, the amorphous alloy powder between the expansion section and the base body is heated through the temperature compensation unit so as to achieve temperature compensation, generation of a nanophase in the amorphous alloy powder is promoted, and the mechanical property and the like are improved; compared with a thermal spraying technology, a laser cladding technology or a laser-assisted technology, crystallization of the amorphous alloy can be avoided, and the excellent performance of the amorphous alloy can be kept in the coating; compared with a pure cold spraying technology, uniform deformation of the amorphous alloy powder can be achieved, the density of the amorphous alloy coating is improved, and therefore the advantages of the amorphous alloy coating in the fields of corrosion prevention, abrasion resistance and the like are fully played.

This invention discloses a laser thermal spraying gun, belonging to the field of laser additive manufacturing technology. It includes a connecting base, an air knife assembly, an inner nozzle, an outer nozzle, a cooling jacket cover, and a cooling jacket tube. The outer nozzle includes a powder feeding body and a Laval tube. The Laval tube has diffusion holes inside. The Laval nozzle accelerates the airflow through a tapered-expanding structure, forming a high-speed, high-temperature jet environment. This ensures the powder is fully preheated and uniformly dispersed before reaching the substrate. Combining the Laval tube with laser spraying combines the advantages of laser cladding and thermal spraying technologies. The accelerated effect of the Laval airflow, under high temperature and high pressure, allows the powder to fully contact the laser heat source over a sufficiently long flight distance through the Laval nozzle. This enables the powder to form a metallurgical bond with the substrate in a molten state, achieving a bonding strength 2-3 times that of traditional thermal spraying. This method is suitable for confined spaces used in the protection and repair of turbine blades from water erosion.

A method includes receiving, by a computing device, a raw image indicative of a cross-section of a thermally-sprayed layer. The image includes a matrix of pixels, and each respective pixel in the matrix of pixels defines a luminance value. The method may further include determining, based on the luminance values, at least one pixel that corresponds to an oxide component in the layer and removing the at least one pixel that corresponds to the oxide component in the layer to generate a modified matrix of pixels. The method may further include generating an oxide-filtered image based on the modified matrix of pixels. The method may further include converting, by the computing device and based on the luminance values, the oxide-filtered image into a binary image and determining, by the computing device and based at least partially on the binary image, a porosity of the coating layer.

The invention relates to the technical field of metal material surface modification, in particular to AlCrCuMoNi high-entropy alloy powder with high temperature, wear resistance, corrosion resistance and good heat conduction, a coating and a preparation method thereof.The high-entropy alloy powder with the particle size being 15-45 microns and suitable for thermal spraying is prepared through a mechanical alloying method, and then the high-entropy alloy powder is prepared through an oxygen-kerosene supersonic flame spraying technology; the preparation method comprises the following steps: spraying high-entropy alloy powder on the surface of a key part matrix by taking high-entropy alloy as a matrix, oxygen as a combustion improver, kerosene as a fuel, high-purity nitrogen as a powder feeding carrier gas and air as a cooling medium to prepare an AlCrCuMoNi HEA coating; al, Cr, Cu, Mo and Ni elementary substance powder is subjected to ball milling according to the required molar ratio through a mechanical alloying method, AlCrCuMoNi HEA powder is obtained, the coating is prepared through the hypersonic flame spraying technology, the method is suitable for improving the high-temperature abrasion resistance and hot corrosion resistance of the surfaces of key parts in the industries of energy, metallurgy, chemical engineering and the like, and the service life of boiler pipes is prolonged.

This invention relates to a coating alloy, based on Iron Boride (Fe2B), a powder developed for bonding the surfaces of steels. Coatings made with the powder of this invention, using methods such as fusion or thermal spraying, provide an increase in surface hardness, wear resistance, and corrosion resistance of metallic materials, especially steels, and therefore represent a significant alternative to bonding through thermochemical methods. The alloy powder developed in this invention essentially contains iron (Fe) and boron (B) elements, with a boron (B) content between 7.1 % and 10% by weight.

The present invention relates to a technical field related to grinding processing, and specifically provides a grinding device for thermal spray coating, comprising: a rack magazine, a collecting moving mechanism is provided at the lower inner side of the rack magazine, a supporting mechanism is provided inside the rack magazine, a frame is fixedly installed above both ends of the rack magazine, a connecting plate is commonly installed between the two groups of the frames, a slide is provided on the outer side of the connecting plate, a driving propulsion mechanism is provided inside the slide, and a slide rod is slidably provided at both ends of the inner side of the slide, and a rotating shaft is rotatably inserted at the lower inner ends of the two slide rods, and the two rotating shafts are fixedly connected to a connecting seat at one end away from the slide rod, and a support block is fixedly installed on one side edge of the two connecting seats, which is rotatably installed with an annular shell corresponding to the inner side of the support block, a gear ring is fixedly installed on one side of the annular shell, and a meshing mechanism is provided on one side of the gear ring. The present invention can adapt to a variety of radians, and sufficient grinding can remove uneven spraying areas and reduce the loss of the grinding structure.

This invention provides a carbon fiber reinforced polymer (CFRP) composite material that enhances the anchoring effect of the metal layer to the CFRP substrate and improves adhesion. [Solution] The CFRP composite material comprises a base material made of CFRP, a first metal layer laminated on the surface of the base material, and a second metal layer laminated on the surface of the first metal layer. The surface of the base material has carbon fiber cutting grooves formed to a depth in which the carbon fibers in the base material are actually cut, and the first metal penetrates into the grooves and is fixed therein. The manufacturing method includes (1) forming the cutting grooves, (2) laminating the first metal layer by thermal spraying (with penetration into the grooves), and (3) laminating the second metal layer by plating.

The invention relates to the technical field of coating preparation, in particular to a niobium alloy surface thermal spraying coating, a preparation method and application, according to the method, a silicide coating is prepared on the niobium alloy surface, halide reaction embedding siliconizing treatment is conducted, and the niobium alloy surface thermal spraying coating is obtained; the silicide coating is prepared on the surface of the niobium alloy through the thermal spraying technology, the rough surface can be formed, anchoring sites are provided for follow-up halide reaction embedding siliconizing treatment, in the follow-up halide reaction embedding siliconizing treatment process, silicon is diffused to a base body to react to form a siliconizing diffusion layer, and metallurgical bonding of a coating-base body interface is achieved. In addition, a continuous transition area is formed between the siliconizing diffusion layer and the silicide coating, stress concentration caused by component mutation is reduced, the risk of interface cracking is effectively reduced, the service life of the coating is prolonged, and the problems that in the prior art, the interface bonding force between a thermal spraying MoSi2-based silicide coating and a base body is poor, and the service life is short are solved.

The present invention belongs to the technical field of thermal spraying equipment, specifically a thermal spraying equipment for annular workpieces, comprising a base and a workpiece fixing assembly, wherein the workpiece fixing assembly comprises a positioning roller, an automatic telescopic rod and a lifting roller, wherein two positioning rollers and two lifting rollers are provided and are symmetrically arranged, and the workpiece fixing assembly adjusts the distance between the positioning roller and the lifting roller by the telescopic movement of the automatic telescopic rod, and the change in the distance between the positioning roller and the lifting roller can achieve the fixing of the annular workpiece from the inside or outside. When fixing the workpiece, the automatic telescopic rod will drive the lifting roller to rise and fall, and the lifting roller will change the distance between the positioning roller and the positioning roller when rising and falling, thereby achieving the fixing of the workpiece from the outside or inside of the workpiece, and when fixing from the inside, it is convenient to spray the outer wall of the workpiece, and when fixing from the outside, it is convenient to spray the inner wall of the workpiece, thereby achieving the effect of facilitating spraying and improving spraying efficiency.