820 results about "Plasma sprayed" patented technology

The invention discloses a carbon fiber cloth reinforced damaged concrete structure detection and analysis method, and relates to the technical field of concrete structure health monitoring, and the method comprises the steps: extracting a high-risk point set from a three-dimensional damage distribution map, carrying out the weighted K-means clustering to construct a Voronoi subspace, calculating the failure probability, and dividing an emergency repair block set; generating a processing queue by using the repairing blocks according to priorities, planning a spiral path of the plasma spray gun by adopting a TSP algorithm, and generating a surface roughness distribution diagram in combination with laser confocal and white light interference detection; according to the roughness partition matching epoxy resin-carbon fiber dynamic matching scheme, a pressure thermodynamic diagram is generated through finite element simulation and electrode time-sharing electrification. Through fusion of the damage evolution graph and the digital twin model, the plasma etching parameters and the conductivity of the carbon fiber cloth are dynamically adjusted, so that the tensile strength of the repaired area is improved, and full-life-cycle health monitoring is realized.

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 provides a coating spraying process for an aluminum alloy wheel. The coating spraying process comprises the following steps: S1, surface treatment; s2, spraying a bottom coating; s3, spraying a surface coating; s4, spraying a nano-particle reinforcing layer; s5, thermal plasma spraying post-treatment is carried out; according to the process method, the adhesive force can be improved, the cold plasma treatment technology can efficiently activate the surface of the aluminum alloy, the adhesive force between the coating and the base material is enhanced, and the risk that the coating is peeled off is reduced. And by adding the nano-particle reinforcing layer, the surface hardness of the coating is remarkably improved, and the coating has higher scratch resistance. And the corrosion resistance is enhanced, specifically, the corrosion resistance and the ultraviolet resistance of the aluminum alloy wheel are greatly improved through the optimized formula of the bottom coating and the surface coating, especially the application of a nano reinforcing material and a photocureable coating. The ultraviolet curing technology of the photocureable coating greatly shortens the curing time, the high-frequency production requirement is met, and the production efficiency is improved.

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 plasma spraying, and discloses a plasma laser automatic composite spraying system which comprises a plasma composite laser spraying gun and an anti-blocking device. The plasma composite laser spraying gun, the powder feeding mechanism and the control panel are arranged to form a stable plasma laser automatic spraying system, efficient spraying of metal components is achieved, meanwhile, an anti-blocking device is further arranged, and through meshing transmission of a main bevel gear, a first auxiliary bevel gear and a second auxiliary bevel gear, the efficient spraying of the metal components is achieved. The first screening assembly and the second screening assembly can rotate synchronously and oppositely, so that bidirectional multiple screening of the spraying powder is achieved, the size of the powder is reduced, the problem of blockage in subsequent use is solved, meanwhile, the stirring assembly can be operated in a linkage mode to further stir the screened powder in a reciprocating mode, the powder is looser, and the powder quality is improved. Therefore, multiple times of screening and stirring of the spraying powder are achieved, the spraying powder is smoothly sprayed and used, and the spraying blocking problem is reduced.

The invention discloses equipment and technology for plasma spray welding of a metal coating on the surface of a ball valve, and relates to the technical field of ball valve machining, the equipment comprises a base, two sliding tables, a lifting table, a clamping assembly, a guide rail mechanism, a sliding seat, a first telescopic support, a second telescopic support and a spray gun rod, the two sliding tables are symmetrically arranged on the base in a sliding mode, and the lifting table is arranged on the sliding tables; a clamping assembly is arranged on the lifting table, the guide rail mechanism is fixedly arranged at the center of the base, the sliding base is arranged above the guide rail mechanism in a sliding mode, a first telescopic support is fixedly arranged on the sliding base, a second telescopic support is vertically and fixedly arranged at the output end of the first telescopic support, and the spray gun rod is fixedly installed on the second telescopic support. The guide rail mechanism comprises a fixed table, a sliding block, a hydraulic telescopic rod, a guide block, a sleeve gasket and a connecting block. According to the method, the remodeling time and cost can be greatly reduced, the application range is effectively expanded, and the spray welding efficiency of the ball valve is further improved.

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 utility model belongs to the technical field of plasma spraying devices, and particularly relates to a spray gun device for plasma spraying, which comprises a base plate and a plasma spray gun body, side plates are fixedly connected to the left side and the right side of the upper end face of the base plate, a movable frame is arranged between the two side plates, and connecting rods are fixedly connected to the left side and the right side of the movable frame. Movable grooves are formed in the outer walls of the two side plates in a penetrating mode, the other ends of the two connecting rods penetrate through the two movable grooves correspondingly, electric push rods are installed on the left side and the right side of the upper end face of the base plate correspondingly, the output ends of the two electric push rods are fixedly connected with the bottom ends of the two connecting rods correspondingly, and a support is fixedly connected to the lower end face of the movable frame. The inner side of the support is rotationally connected with a lead screw. The automatic gun distance adjusting device realizes automatic and accurate gun distance adjustment, is convenient to operate and high in automation degree, and improves the working efficiency.

The invention relates to the technical field of metal material coatings, in particular to a PVD composite coating and a preparation method thereof. The preparation method comprises the following steps: pretreating a metal matrix to obtain a pretreated matrix; carrying out magnetron sputtering deposition on the surface of the pretreated matrix by using a composite target material, carrying out plasma spraying and laser texturing for multiple times, and repeating the process to form a composite coating crude product containing a third rare earth doped high-entropy alloy coating; the composite coating crude product is subjected to post-treatment, and the composite coating is obtained; wherein the composite target material is AlCoCrFeNi-Y, and the composite oxide comprises aluminum oxide, titanium oxide and cerium oxide. According to the preparation method, the bonding strength, hardness and strength of the composite coating can be remarkably improved through magnetron sputtering deposition of the rare earth doped high-entropy alloy coating, plasma spraying formation of the composite ceramic coating with the gradient content, laser texturing treatment, alternate construction of multiple layers of coatings and the like in combination with elaborately selected materials with low expansion coefficients.

The invention relates to a thermal / environmental barrier coating and a preparation method thereof. The coating is of a three-layer structure and sequentially comprises a silicon bonding layer, an ytterbium silicate environment barrier layer and a (RE1xRE21-x) 3TaO7 thermal barrier surface layer from inside to outside. The ytterbium silicate environmental barrier layer is formed by mixing Yb2SiO5 and Yb2Si2O7; a (RE1xRE21-x) 3TaO7 thermal barrier surface layer, wherein x is more than or equal to 0.5 and less than 1; in the preparation method, the high-performance thermal / environmental barrier coating is efficiently prepared by adopting the scheme of synthesizing target powder through a solid-phase reaction, preparing a spraying feed through spray granulation and depositing the coating layer by layer through plasma spraying and utilizing the mechanisms of synergistic improvement of functions of the multi-layer coating, doping modification of rare earth elements and the like. The thermal / environmental barrier coating disclosed by the invention has the advantages of excellent CMAS corrosion resistance, good thermal insulation effect and high layer-to-layer thermal matching, and the service life of the SiCf / SiC composite material can be prolonged under the temperature condition of 1500 DEG C by the thermal / environmental barrier coating.

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 high-temperature-resistant and corrosion-resistant aluminum alloy material and a preparation process thereof, and relates to the technical field of aluminum alloy materials. The high-temperature-resistant and corrosion-resistant aluminum alloy material is prepared by carrying out micro-arc oxidation treatment on aluminum alloy, carrying out plasma spraying on a corrosion-resistant spray coating and carrying out heat treatment. The aluminum alloy comprises the following raw material components in percentage by weight: 0.05%-0.15% of silicon, 0.1%-0.2% of iron, 1.2%-1.5% of copper, 0.7%-0.9% of manganese, 2.5%-3.8% of magnesium, 10.2%-12.4% of zinc, 0.02%-0.04% of titanium, 0.08%-0.15% of zirconium, 0.2%-0.4% of scandium, 0.5%-0.8% of silicon nitride whiskers, 0.5%-1% of an aluminum-coated graphene material and the balance of aluminum.

The utility model relates to the technical field of plasma paint spraying equipment, in particular to plasma paint spraying processing electromechanical equipment which comprises an equipment body, a spray gun adjusting mechanism and a spray gun body, the spray gun adjusting mechanism is arranged on the left side of the equipment body, the spray gun body is arranged on the left side of the spray gun adjusting mechanism, and a spray gun nozzle is fixedly connected to the left end of the spray gun body. According to the powder spraying device, through the arrangement of the powder conveying pipe, the powder outlet pipe, the confluence cover, the circulation sleeve and the small air pump, powder to be sprayed can be sprayed out in a dispersed mode through the powder conveying pipe and the powder outlet pipe, waste or pollution caused by the fact that the powder to be sprayed drifts away is prevented through the confluence cover, and the powder to be sprayed can be sprayed out in a dispersed mode. The airflow generated by the small air pump forms rotational flow through the circulation sleeve, the powder in the confluence cover is blown up, the powder is taken away by the plasma jet, and the device can limit the drifting range of the powder to be sprayed, so that the utilization rate of the powder to be sprayed is greatly improved, and the spraying efficiency is effectively improved.

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 discloses an automobile structure assembly gluing heat treatment method and system based on frequency conversion microwaves. The method comprises the steps that the surface of an automobile structure assembly is subjected to activating treatment through a plasma spraying technology; the method comprises the following steps: coating a to-be-glued automobile structure component with an adhesive, carrying out heat treatment on the coated automobile structure component by adopting a variable-frequency microwave generator, dynamically adjusting the microwave frequency to realize uniform heating of the interior of an adhesive layer, monitoring the temperature field distribution of the adhesive layer in real time, and dynamically adjusting the microwave power output; in the microwave heat treatment process, pressure is applied synchronously to promote discharge of bubbles in the adhesive layer and improve the compactness and mechanical property of the adhesive layer; and a gradient cooling mode is adopted for cooling the automobile structure assembly subjected to heat treatment. According to the embodiment of the invention, the bonding quality and durability of the automobile structural component can be remarkably improved through frequency adjustment, temperature monitoring, bubble removal and pressure application in the microwave heating process.

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 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.

The utility model relates to the field of spraying devices, and discloses a powder plasma spraying device which comprises a first vertical frame, the top of the first vertical frame is fixedly connected with a first limiting block, the top of the first limiting block is fixedly connected with a first motor, and the output end of the first motor is fixedly connected with one end of a first threaded rod. And the other end of the first threaded rod is rotationally connected to the top of the bottom plate, the first threaded rod is in threaded connection with a fourth limiting block, the fourth limiting block is slidably connected to the inner wall of the first vertical frame, a transverse frame is fixedly connected to the inner wall of the fourth limiting block, and a third motor is fixedly connected to the outer wall of the fourth limiting block. According to the device, rotating force is output through the first motor and the second motor to enable the first threaded rod and the second threaded rod to rotate, rotating force is output through the third motor to enable the third threaded rod to rotate, the second motor, the first motor and the third motor are remotely controlled through the controller, and therefore the purpose of improving personal injuries to workers is achieved.

The invention belongs to the field of surface icing resistance of metal materials, and particularly relates to a machining method of a surface icing-resistant microstructure. The anti-icing structure is prepared on the 30CrMnSiNi2A surface by using micro-milling and surface modification technologies, the operation is simple, the cost is low, the processing efficiency is higher, and the preparation of a large-area anti-icing surface of a material is expected to be realized. And meanwhile, the method is also suitable for preparing anti-icing structure surfaces of other materials. Atmospheric pressure cold plasma jet is adopted, localized modification is conducted on the material surface through the Rehbinder effect, and the machining quality and machining efficiency of the anti-icing structure are improved. And the modified surface is cut in time, so that the material characteristics of the anti-icing surface are not influenced, and the influence on the service performance of the material is avoided. The device is simple and easy to operate, small in space size and high in adaptability, when the device is used, only the plasma spray head needs to be aligned with a machining area, additional modification does not need to be conducted on a machine tool, and the production cost is reduced.

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 relates to the technical field of plasma spraying, and discloses an air conditioner rack surface treatment system based on plasma spraying, which comprises a spraying parameter acquisition module, a plasma characteristic analysis module, a melting state monitoring module, a multi-source fusion judgment module, a regulation and control parameter generation module, and a stress coupling analysis and dynamic feedback execution module. The system judges a coating combination failure risk by collecting parameters such as surface roughness and environment temperature and humidity, extracts jet parameters to evaluate thermal stability, monitors a particle spreading form to predict a melting qualification rate, fuses multiple parameters to generate a quality index and an adjustment signal, generates an adjustment parameter by matching a strategy, monitors a stress matching degree and corrects the index. And dynamically adjusting the process through closed-loop control. The system realizes multi-parameter real-time monitoring and self-adaptive regulation and control, improves the coating quality and the process stability, and is suitable for air conditioner rack surface treatment.

We provide a coating as an environmental barrier coating, for example on a ceramic matrix composite, e.g., in a gas turbine. The coating comprises a rare earth monosilicate and a rare earth disilicate in a weight ratio of at least about 70:30. The coating is at least 60% crystalline, has a porosity of at most about 40%, and is free of through-thickness cracks. We also provide a method of manufacturing this coating comprising heating a substrate to at least about 500° C., and depositing the coating by atmospheric plasma spraying ytterbium disilicate particles on the heated substrate, wherein the atmospheric plasma spraying is performed with a plasma spray torch operated at an operating power of at least 60 kW.

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 invention belongs to the technical field of biomimetic materials, and discloses a titanium alloy implant surface biomimetic coating and a preparation method thereof.The biomimetic coating comprises a porous titanium support layer, a micron-sized porous titanium layer is prepared through plasma spraying, and then nano-hydroxyapatite is doped to improve osteoinductivity; the graphene enhancement layer is modified, a graphene oxide film is electrochemically deposited, the graphene oxide film and the titanium substrate are covalently bonded through a silane coupling agent, and strontium ions are loaded to promote osteogenic differentiation; an antibacterial active layer and in-situ reduced graphene oxide form a three-dimensional network conductive structure, tantalum-doped carbon nitride quantum dots are loaded through ultrasonic dispersion and embedded between graphene layers to form an antibacterial phase, and then magnesium silicate nanowires are subjected to hydrothermal growth to form a bioactive phase. Through triple bionic design of porous titanium, ion release / photo-thermal response and PDA adhesion, the bone bonding strength, antibacterial property, wear resistance and corrosion resistance of a coating interface are improved.

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.