101 results about "Plasma spray process" patented technology

The invention discloses a high-strength stainless steel seamless steel pipe and a machining process thereof, and relates to the technical field of alloy treatment. The processing technology of the high-strength stainless steel seamless steel tube comprises the following steps: step 1, pretreating the stainless steel seamless steel tube to obtain a pretreated stainless steel seamless steel tube; 2, an ion nitriding process is adopted for conducting synchronous nitriding treatment on the inner pipe and the outer pipe of the pretreated stainless steel seamless steel pipe, and the nitrided stainless steel seamless steel pipe is obtained; and 3, the plasma spraying technology is adopted, the surfaces of the inner pipe and the outer pipe of the nitrided stainless steel seamless steel pipe are each coated with a compression-resistant protective layer, and the high-strength stainless steel seamless steel pipe is obtained through microwave treatment. Pretreatment, plasma nitriding treatment and plasma spraying treatment are sequentially conducted on the inner pipe and the outer pipe of the stainless steel seamless steel pipe with the specific component proportion, the compressive strength, the fatigue resistance and other performance of the inner pipe and the outer pipe of the stainless steel seamless steel pipe are synergistically enhanced, and the quality of the stainless steel seamless steel pipe is improved.

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 ceramic-based low-frequency wave-absorbing coating and a preparation method and application thereof.The preparation method of the ceramic-based low-frequency wave-absorbing coating comprises the steps that after a metal substrate is subjected to chamfering, deoiling and sand blasting treatment, a bonding layer is prepared on the metal substrate through a plasma spraying technology; preparing a ceramic layer on the bonding layer by adopting a plasma spraying process, and then pasting an aluminum film adhesive tape on the surface of the ceramic layer and flattening the aluminum film adhesive tape; a laser marking machine is used for cutting the aluminum film adhesive tape according to a surface periodic structure unit, and the surface periodic structure unit is of a square and round combined structure; after cutting is completed, the square aluminum film adhesive tape and the round aluminum film adhesive tape are torn down, and then a structural layer is prepared on the ceramic layer through a plasma spraying technology; and tearing off the rest of the aluminum film adhesive tape, placing the coating in a muffle furnace, sintering for a set time at a set temperature, and cooling to obtain the ceramic-based low-frequency wave-absorbing coating. The low-frequency wave-absorbing performance of the coating can be improved.

The invention discloses a thermal barrier coating with a double-bonding-layer structure and a preparation method thereof, and belongs to the field of thermal barrier coatings. According to the thermal barrier coating, nickel-based high-temperature alloy serves as a substrate, the thermal barrier coating sequentially comprises an MCrAlY lower bonding layer, a Cr2AlC upper bonding layer and an 8YSZ ceramic layer, the MCrAlY lower bonding layer and the Cr2AlC upper bonding layer are prepared through the high velocity oxy-fuel spraying technology, and the 8YSZ ceramic layer is prepared through the atmosphere plasma spraying technology. According to the thermal barrier coating system, through the synergistic effect of the oxidation resistance of the Cr2AlC upper bonding layer and the mutual diffusion inhibition characteristic of the MCrAlY lower bonding layer, the comprehensive performance of the thermal barrier coating is optimized, meanwhile, the anti-stripping capacity of the thermal barrier coating system is remarkably improved, and the thermal barrier coating system is suitable for various high-temperature alloy substrates, is not limited by alloy component differences, can further adapt to workpieces in complex geometrical shapes and is suitable for industrial production. The method can be used for protecting hot-end components such as aero-engine turbine blades and the like.

The invention belongs to the technical field of electrode plates, and particularly relates to a high-activity binary alloy hydrogen evolution electrode plate and a preparation process method. The preparation process method comprises the following steps: obtaining a metal nickel electrode substrate and white corundum sand with different particle sizes; carrying out cleaning treatment on the metal nickel initial electrode substrate; the pretreated metal nickel initial base body serves as a working electrode, and sand blasting pretreatment is conducted on a metal nickel electrode base body through white corundum sand; dust removal operation is conducted on the metal nickel electrode base body subjected to sand blasting pretreatment; and spraying binary metal alloy powder on the intermediate hydrogen evolution electrode plate through an atmospheric plasma spraying process to form the high-activity binary alloy hydrogen evolution electrode plate. The whole preparation process method sequentially comprises the steps of cleaning treatment, sand blasting pretreatment, atmospheric plasma spraying, natural cooling and the like, the process method for preparing the electrode plate is optimized, it is guaranteed that the electrode plate has excellent long-time hydrogen evolution stability when the electrode plate is subjected to a hydrogen evolution reaction, and the excellent hydrogen production effect can be achieved.

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 present invention relates to a high-temperature, high-infrared-emissivity and low-thermal-conductivity coating and its preparation method and application, comprising: cleaning a substrate and performing sandblasting; spraying alloy powder to form a bonding layer; and using a solution plasma spraying process to spray an atomized solution containing a water-soluble strontium source, a water-soluble X source and a water-soluble zirconium source to obtain the Sr(Zr) prepared by the present invention. 1‑y X y )O z The coating has high infrared radiation performance, and its infrared emissivity at 600℃ can reach 0.986; it also has low thermal conductivity performance, and its thermal conductivity at 1000℃ can be as low as 1.63 W·m ‑1 ·K ‑1 The resulting coating is suitable for a variety of substrates and complex surface structures, and can form a uniform and continuous coating in different application scenarios such as aircraft skins, electronic device housings, and sintering furnace inner chambers, ensuring the full performance of the 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.

The invention provides a diesel power piston surface ceramic coating material, a thermal barrier coating and a preparation method thereof, and relates to the field of ceramic coatings. The ceramic coating material is uniformly mixed plasma spraying composite powder and comprises 8YSZ powder, cordierite powder and silicon oxide powder, and the hollow rate of the 8YSZ powder is 30-45%; the particle size of the cordierite powder is not greater than 30 [mu] m, the content of the cordierite powder is 20-30 wt.%, the content of the silicon oxide powder is 5-8 wt.%, and the balance is the 8YSZ powder. According to the ceramic coating obtained by spraying the ceramic coating material through an atmospheric plasma spraying process, cordierite with a porous and multiphase structure and relatively low density and volume heat capacity is uniformly doped in the ceramic coating, and pores are distributed at intervals, so that the whole ceramic coating has low volume heat capacity and low heat conductivity; and the ceramic coating is also relatively high in bonding strength and relatively low in density, so that the thermal efficiency of diesel power can be improved, and the oil consumption of an engine is reduced.

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 present invention provides a plasma spraying device and a plasma spray deposition system. The power supply module in the device includes an integrated control unit, a power supply control unit, and a power supply unit, which are arranged in sequence. The power supply unit includes multiple plasma power supplies connected in parallel. The multiple plasma power supplies are connected to the anode of the plasma spray gun via a positive control connection unit and a first water-power cluster connection unit, and are connected to the cathode of the plasma spray gun via a negative control connection unit and a second water-power cluster connection unit. The multiple plasma power supplies in the device adopt a parallel control mode and balance the load through distributed logic self-rectification control. At the same time, integrated control is achieved through the integrated control unit and the power supply control unit, ensuring that the simultaneous output loads of multiple power supplies are absolutely balanced. In addition, the output mode can also be set through the connection module to meet the requirements of different plasma spray processes and plasma spray guns, thereby realizing the versatility of the power supply module and the interchangeability of different types of system equipment.

The application discloses a rare earth modified transition layer material, which comprises the following raw materials in parts by weight: 10-100 parts of metal lanthanum cerium, 6000-7000 parts of metal iron, 1100-1300 parts of boron iron, 100-500 parts of silicon iron and 6000-7000 parts of metal nickel. The preparation method comprises the following steps: (1) weighing the raw materials and adding them into a vacuum induction melting furnace; (2) vacuumizing, filling high-purity argon, increasing temperature and keeping temperature; (3) vacuumizing, filling high-purity argon, increasing temperature, keeping temperature after all the metals are melted; (4) pouring into a mold and cooling; and (5) preparing spherical alloy spraying powder, thereby obtaining the rare earth modified transition layer material. The use method comprises the following steps: adopting plasma spraying process, controlling spraying power to be 15-32 KW, voltage to be 40-55 V, current to be 360-560 A, gas flow to be 25-45 L / min and spraying distance to be 10-25 cm. The rare earth modified transition layer material has high sphericity and good fluidity, the obtained coating has a bonding strength reaching the level of nickel-coated aluminum coating, and the hardness and wear resistance of the coating are much higher than those of the nickel-coated aluminum coating.

The invention relates to homogeneous metal doped Y2O3 spraying powder as well as a preparation method and application thereof, and belongs to the technical field of thermal spraying materials. According to the powder, high-purity Y2O3 serves as a matrix, and through doping of homogeneous metal yttrium, the sintering activity of the powder, the melting characteristic in the plasma spraying process and the coating compactness are remarkably improved. The powder obtained by the invention has the characteristics of high sphericity, narrow particle size distribution and good fluidity, is suitable for preparing a Y2O3 coating with high density and low porosity, and has important application value in plasma corrosion resistant parts of semiconductor equipment. The low-melting-point metal yttrium powder is introduced for doping Y2O3, defects can be generated in crystal lattices of the Y2O3, or a solid solution can be formed, so that the electronic structure and the crystal structure of the material are changed, the crystal lattices can be distorted to form the solid solution and an absent solid solution, the temperature can be reduced, and spraying is facilitated.

The application discloses a silicon-aluminum target material and a preparation method thereof, and belongs to the field of metal processing. The method adopts a plasma spraying process. When the product is prepared, through special protection design of a rotating spraying back pipe and selection of powder raw materials with special particle sizes, the prepared product can have high deposition rate and high production efficiency on the basis of high density and no obvious cracks.

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 relates to a method for preparing a high-entropy rare earth hafnate thermal protection coating through atmospheric plasma spraying, and belongs to the technical field of ceramic coatings. According to the method, atmospheric plasma spraying is adopted, NiCrCoAlY powder is sprayed to a base body to prepare a bonding layer, then (Y0. 2Yb0. 2Ho0. 2Er0. 2Tm0. 2) 2Hf2O7 powder for spraying is sprayed to the bonding layer, and the high-entropy rare earth hafnate thermal protection coating is prepared. According to the method, aiming at the characteristics of high-entropy rare earth hafnate (Y0. 2Yb0. 2Ho0. 2Er0. 2Tm0. 2) 2Hf2O7, a raw material (Y0. 2Yb0. 2Ho0. 2Er0. 2Tm0. 2) 2Hf2O7 powder is subjected to spray granulation and degumming strengthening treatment, so that a spraying material with the fluidity of 82s / 50g to 83s / 50g, the particle size of 30 microns to 60 microns and the apparent density of 1.58 g / cm < 3 > to 1.60 g / cm < 3 > is obtained, and specific atmospheric plasma spraying process parameters are set; the high-entropy rare earth hafnate thermal protection coating with high density, low porosity, good bonding strength and excellent thermal shock resistance is obtained by cooperatively regulating and controlling the characteristics of a spraying material, spraying process parameters and deposition dynamic behaviors.

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 invention relates to the field of metal nanopowder or plasma spraying, and particularly discloses a bile duct stent prepared by combining metal nanopowder with a plasma spraying process, and a ZrNbFeLa coating prepared by the plasma spraying process has good corrosion resistance but is poor in hemolysis rate. Furthermore, a proper amount of metal Ti is injected into the ZrNbFeLa coating, so that the biocompatibility of the ZrNbFeLa coating can be remarkably improved, and the influence on the corrosion resistance is small, so that the ZrNbFeLa coating can meet the use requirements of medical materials such as bile duct stents. It needs to be noted that the ion implantation amount of metal Ti needs to be controlled to be 2.8 * 10 < 5 > ions / cm < 2 > to 1.2 * 10 < 12 > ions / cm < 2 >, otherwise, the corrosion resistance of the ZrNbFeLa coating can be sharply reduced due to excessive titanium.