370 results about "Plasma sprayed" patented technology

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

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

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

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

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

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

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

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

The 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 invention discloses a high-entropy ceramic thermal barrier coating and a preparation method thereof, and relates to the technical field of thermal barrier coating materials. The method comprises the following steps: mixing ZrO2, HfO2, Ta2O5 and various rare earth oxides, and carrying out high-energy wet ball milling, drying, solid solution sintering and crushing to prepare submicron high-entropy ceramic powder; mixing the modified powder with aluminum sol obtained by hydrolyzing aluminum isopropoxide, rare earth nitrate and the like, dispersing, drying and carrying out heat treatment to obtain modified powder coated with aluminum oxide nanoparticles on the surface; carrying out spray drying granulation to obtain spherical agglomerated powder; and finally, a DD6 single-crystal high-temperature alloy matrix is subjected to sand blasting and pre-oxidation treatment, agglomerated powder is deposited on the surface of the matrix through a plasma spraying vapor deposition technology, a columnar crystal coating is formed, and a finished product is obtained through vacuum annealing. The coating prepared through the method is uniform in structure and high in bonding strength, thermal shock resistance and high-temperature phase stability are remarkably improved, and the coating is suitable for surface protection of aero-engine hot end components.

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 invention belongs to the technical field of in-situ observation sample preparation, and particularly relates to a method for in-situ observation of a Ti alloy sample through a high-temperature laser confocal microscopy, and the method comprises the following steps: S1, grinding, polishing and ultrasonic cleaning treatment of Ti alloy; s2, performing plasma spraying treatment on the alumina crucible, and spraying a layer of yttrium oxide powder on the surface of the alumina crucible; s3, hanging a pure titanium sheet in a hearth of the high-temperature laser confocal microscope; and S4, the Ti alloy sample pretreated in the step S1 is put into a crucible, and in-situ observation is conducted through a high-temperature laser confocal microscope. The method is simple to operate, solves the problems that the Ti alloy is easy to oxidize at high temperature and is not provided with an adaptive observation crucible, and can be used for observing the microstructure evolution of the Ti alloy in situ and observing the microstructure evolution process of the Ti alloy in real time under the high-temperature laser confocal microscope so as to facilitate the subsequent research on growth mechanism analysis and growth kinetics quantification.

The invention relates to the technical field of plasma injection, and discloses a plasma beam injection system in a chromium plating machine, which comprises an electroplating bin, a bin door matched with the electroplating bin is arranged on one side of the surface of the electroplating bin, and a workpiece clamping mechanism is arranged in the electroplating bin and is used for clamping and fixing a workpiece and driving the workpiece to rotate while revolving. Plasma beam emitting mechanisms are arranged on the two sides of the inner wall of the electroplating bin and used for emitting plasma beams. According to the plasma spraying device, the plasma beam can cover the surface of the workpiece without dead angles, the problems of spraying leakage and stacked spraying caused by single movement are effectively avoided, a bidirectional spraying pattern can be formed, the coating uniformity and the coating bonding strength are improved, and therefore the spraying requirement of the workpiece can be better met.

The invention relates to a solar photo-thermal power generation technology, in particular to a high-temperature-resistant composite heat absorption coating with NiCrAlY as a bonding layer and a preparation process of the high-temperature-resistant composite heat absorption coating, and belongs to the field of solar heat utilization. The preparation method comprises the following steps: firstly, depositing a NiCrAlY coating on a Ni-based high-temperature alloy matrix as a bonding layer through a plasma spraying technology; then, a manganese cobalt oxide spinel heat absorption coating containing polybenzoate is prepared on the NiCrAlY coating again through the plasma spraying technology; and finally, polybenzoate is removed through heat treatment, and the composite heat absorption coating which is good in binding force and has a special shape is formed on the base body. The heat absorption coating has the advantages of being good in process repeatability, controllable in component, suitable for high-temperature long-term service and the like, and the prepared coating has a special shape and has high stability and high absorptivity when being used at a high temperature. The NiCrAlY bonding layer is introduced into a heat absorption coating system, so that the peeling or falling phenomenon caused by the difference of thermal expansion coefficients between the ceramic coating and the alloy can be effectively reduced, and the target of long-term service at high temperature is achieved.

The invention provides a low-temperature plasma spraying method for a heat-sensitive polymer matrix and a composite material, and belongs to the technical field of surface engineering. According to the method, through a system process of matrix surface pretreatment, spraying powder drying and low-temperature plasma spraying, the core is that a matrix active cooling technology is adopted in the range of 0-10 DEG C to isolate the plasma arc heat influence, and optimized sand blasting coarsening, powder granularity control and spraying process parameters are matched; and the compact Al2O3-TiO2 ceramic coating with high bonding strength is successfully prepared on a heat-sensitive epoxy resin matrix. The limitation that a traditional thermal spraying technology cannot be used for high polymer materials is broken through, the technological process is simple, the cost is low, and the obtained coating is excellent in abrasion resistance and suitable for meeting the requirement for high performance of the surface of the light high polymer material in the fields of electronic equipment, aerospace and the like.

The invention relates to the field of surface protective coatings, in particular to a wear-resistant self-lubricating coating and a preparation method thereof.The wear-resistant self-lubricating coating is of a gradient composite structure composed of a matrix binding layer, a transition wear-resistant layer and a surface lubricating layer, the matrix binding layer is Ni-Co alloy doped with TiC nano-particles, and the transition wear-resistant layer is a Ni-Co alloy doped with TiC nano-particles. The transition wear-resistant layer is CrC-AlO composite ceramic doped with WSlubricating particles, a tough nano-composite bonding layer is prepared through magnetron sputtering on the basis of combination of matrix pretreatment optimization, the high-hardness wear-resistant ceramic middle layer is constructed through plasma spraying, and the wear-resistant ceramic middle layer is prepared through plasma spraying. Then an intelligent surface layer with an instant-reserve dual-mode lubricating function is elaborately laid through a low-temperature plasma spraying technology, and finally the coating structure is stabilized through post-treatment; the gradient design is combined with precise manufacturing, so that the coating has excellent adhesive force, extremely high wear resistance, ultralow friction coefficient and unique long-acting self-lubricating capacity at the same time, and long-acting reliable protection under severe working conditions is realized.

The invention relates to the technical field of battery pack shells, in particular to a battery pack shell and a preparation method thereof.The preparation method comprises the steps that a ceramic resin composite material and a ceramic composite material are prepared; uniformly stirring the polyphenyl ether resin, the flame retardant, the zirconium boride and the antioxidant to obtain a mixture; feeding the mixture into a double-screw extruder, and performing side feeding, extrusion and granulation on the modified carbon fibers to obtain an inner matrix material; melting the inner matrix material, injecting into a mold, cooling to room temperature, and taking out to obtain a primary product of the battery pack shell; and sequentially spraying the ceramic resin composite material and the ceramic composite material on the surface of the primary product of the battery pack shell by adopting a plasma spraying method to prepare the battery pack shell. According to the invention, the surface of the resin matrix is continuously covered with the ceramic resin connecting layer and the ceramic protective layer, so that the ablation resistance and the friction resistance of the battery pack shell are greatly improved.

The application discloses a preparation method of wear-resistant and corrosion-resistant hot-dip galvanized steel plate and belongs to the technical field of surface strengthening. The preparation method comprises the following steps: S1, hot rolling; S2, cold rolling; S3, hot-dip galvanizing: the cold-rolled steel plate is heated to 700-718 DEG C and kept for 5-10 min, and then the hot-dip galvanizing is carried out by slowly cooling at 5-8 DEG C / s to 410-415 DEG C, the galvanizing temperature is 440-450 DEG C, the galvanizing time is 18-22 s; after the galvanizing, the galvanized steel plate is cooled and dried, the content of Sn in the melt for the hot-dip galvanizing is 0.8-1.0% by mass percentage, and the rest is Zn; the galvanized steel plate is obtained; S4, surface treatment: the galvanized steel plate is sprayed with a YSn3 coating by using plasma spraying to obtain the wear-resistant and corrosion-resistant hot-dip galvanized steel plate. The wear-resistant and corrosion-resistant hot-dip galvanized steel plate obtained by the application has a double-layer structure, the inner layer is a zinc layer, and the outer layer is covered with a YSn3 layer, so that the wear-resistant and corrosion-resistant hot-dip galvanized steel plate has the effects of wear resistance, corrosion resistance and surface repair.

The invention discloses a coating material with wear resistance and self-lubricating performance as well as a preparation method and application of the coating material. The method comprises the following steps: mixing wear-resistant metal-based powder with high-temperature gas-producing high-molecular organic matter powder to obtain coated composite powder; spraying the coated composite powder onto a base material by using a plasma spraying technology to obtain a coating with a porous structure; and immersing the coating with the porous structure into a suspension containing a self-lubricating two-dimensional material, and depositing the two-dimensional self-lubricating material into the porous structure under the action of ultrasonic treatment to obtain the coating material with both wear resistance and self-lubricating performance. A porous wear-resistant framework is constructed through plasma spraying, the porous coating is obtained, and the two-dimensional self-lubricating material is embedded into pores of the porous coating by combining an ultrasonic deposition technology, so that the coating has the characteristics of high bearing capacity and low friction at the same time. The technology can effectively solve the problems that a traditional wear-resistant coating is high in friction coefficient and a self-lubricating coating is insufficient in wear resistance.

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.

This invention relates to a method for controlling the deformation of thin-walled, weakly rigid parts manufactured by additive manufacturing during thermal spraying. Belonging to the field of thermal spraying technology, it solves the technical problem of deformation occurring during the thermal spraying coating preparation process of thin-walled, weakly rigid parts with large residual stress, affecting assembly. The method for controlling the deformation of thin-walled, weakly rigid parts manufactured by additive manufacturing during thermal spraying includes the following steps: S1, detecting and processing the residual stress of the part; S2, designing and processing a thermal spraying shaping fixture; S3, assembling the fixture and part and then sandblasting; S4, performing stress-relief annealing on the part; S5, performing vibration aging stress relief on the part; S6, conducting a second residual stress detection and data processing on the part, and then calculating the residual stress change rate; S7, assembling the fixture and part and then performing plasma spraying; and S8, post-treatment after plasma spraying. This invention improves the surface accuracy of the part after plasma spraying and avoids assembly step differences.

The application provides a high-performance bulletproof ceramic and a preparation method thereof, and the method comprises the following steps: preparing a hard alloy coating on a metal transition layer on the surface of a ceramic base by using a supersonic flame spraying method; then, a plurality of blind hole grooves arranged in a matrix interval are opened on the surface of the hard alloy coating by using a laser etching method; then, the blind hole grooves are filled with soft metal by using the supersonic flame spraying method; after the upper surface of the soft metal in each blind hole groove is polished to be flush with the upper surface of the hard alloy coating, a hard ceramic coating is prepared on the upper surface of the hard alloy coating and the soft metal by using an atmospheric plasma spraying method. The soft metal filled in each blind hole groove of the hard alloy coating captures the broken ceramic to achieve a secondary anti-penetration effect, and the soft area formed by the soft metal and the hard area formed by the hard alloy coating make the bullet body bear uneven stress to achieve the effect of deflecting the penetration path.

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

This invention relates to a titanium alloy artificial joint with a high-toughness, ultra-wear-resistant ceramic coating and its preparation method. The titanium alloy artificial joint includes a titanium alloy artificial joint substrate fabricated by 3D printing. The joint surface of the titanium alloy artificial joint substrate is coated with an alumina-based ceramic coating. The alumina-based ceramic coating is obtained by plasma spraying of a mixed powder of alumina, zirconium oxide, and rare earth oxides, and then polished to a surface roughness Ra of no more than 0.05 μm. The bone-bonding surface of the titanium alloy artificial joint is formed into a porous structure layer by 3D printing. Compared with the prior art, the titanium alloy artificial joint of this invention has excellent wear resistance and toughness, and can be personalized based on precise imaging data of the patient's bones.

The invention belongs to the technical field of plasma cutting, particularly relates to an aluminum alloy circular pipe plasma cutting device for numerical control machining, and aims to solve the problems of insufficient positioning precision, low automation degree and complex equipment structure in the background technology, according to the following scheme, the aluminum alloy circular pipe plasma cutting device comprises a rack, and a C-shaped plate frame is arranged at the top of the outer wall of one end of the rack; and a plasma cutting mechanism is arranged on the outer wall of the C-shaped plate frame. By means of real-time monitoring of a grating sensor and a grating ruler, the displacement of a linear motor is dynamically corrected in cooperation with a PLC, the cutting path of a plasma spray head is accurately controlled, and the problems that the cutting center of an aluminum alloy circular pipe deviates, and a notch inclines are solved; according to the device, programmable precise feeding of the round pipes is achieved, modular integrated design is adopted, cutting assemblies, pushing assemblies, guiding assemblies and the like are matched in order, a traditional complex structure is simplified, and the manufacturing cost and the maintenance difficulty are reduced.

The invention relates to the technical field of spraying materials, in particular to ceramic powder for spraying and a preparation method thereof. The ceramic powder for spraying comprises the following components in percentage by weight: 6.0%-8.5% of Y2O3 in a yttria-stabilized zirconia matrix, 0.5%-1.5% of ZrO2 in the yttria-stabilized zirconia matrix, 0.5%-1.5% of ZrO2 in the yttria-stabilized zirconia matrix, and 1.0% to 12.0% of nano-scale Al2O3 (aluminum oxide); 0.5%-6.0% of nano-scale Y2O3 (yttrium oxide); wherein the primary particle size of the nanoscale Al2O3 is 20 nm to 100 nm, and the primary particle size of the nanoscale Y2O3 is 20 nm to 100 nm; the ceramic powder is micron-sized spherical particles obtained through spray granulation and heat treatment, and in the micron-sized spherical particles, nano-sized Al2O3 and nano-sized Y2O3 are wrapped and uniformly dispersed in a yttria-stabilized zirconia matrix to form an inner composite structure. According to the ceramic powder for spraying, provided by the invention, the mechanical property and high-temperature stability of a coating are enhanced essentially. The nanometer materials are packaged in the micron spherical particles in advance, the industrialization problems that pure nanometer powder is poor in fluidity and difficult to convey are solved, and the nanometer powder can be compatible with existing plasma spraying equipment.

The application relates to a plasma direct deinking method, belonging to the paper deinking technical field.The plasma direct deinking method is characterized in that: a plasma spray gun with a special electrode structure is designed and manufactured, ionized working gas is used as a working medium, a plasma jet is generated to directly process the surface of paper materials, and different carrier gases are used according to different inks.The application uses ionized gas instead of chemical deinking agents, adopts a direct surface processing method, and under the bombardment of plasma particles, the combination of ink components with paper fibers is lost, and the pigments and other particles in the components are stripped from the surface of the paper, so that the ink on the surface of the paper is directly removed.The application can obtain a plasma direct deinking method.

This invention discloses a high-thickness, high-purity MAX phase coating and its preparation method. The method includes: 1. Mixing a metal oxide and a carbon source, followed by high-energy ball milling and spray granulation to prepare spherical precursor powder; 2. Depositing a transition layer on a sandblasted substrate surface using plasma spraying, and then depositing the spherical precursor powder on the transition layer to form a precursor coating; 3. Immersing the substrate with the precursor coating in molten salt for electrolysis, causing the precursor coating to be electro-deoxidized and converted into a MAX phase coating. This invention employs a synergistic process of "plasma spraying-molten salt electrochemical conversion," converting the sprayed precursor coating into a MAX phase coating through in-situ electro-deoxidation in molten salt electrochemistry. This process has high deposition efficiency and avoids the defects of carbon loss, phase decomposition, and oxidation in the coating product when directly thermally spraying MAX materials. It achieves the preparation of a high-thickness, high-purity MAX phase coating, suitable for the field of surface protection.

The invention provides a preparation method of a lunar dust simulant. The preparation method comprises the following steps: drying and screening simulated lunar dust in a drying oven to obtain first powder; filling the first powder into a planetary powder container of magnetron sputtering equipment, filling the container filled with the first powder into a vacuum chamber, vacuumizing the vacuum chamber, and performing in-situ preheating on the first powder; performing magnetron sputtering deposition on the first powder subjected to in-situ preheating to obtain second powder; an atmosphere plasma spraying system is adopted, and a precursor coating with nano iron wrapped by an amorphous glass phase is formed; completely stripping the precursor coating from the substrate through a physical external force to obtain an artificial lunar dust precursor; carrying out controllable crushing on the artificial lunar dust precursor so as to controllably crush the artificial lunar dust precursor into slurry with target particle size distribution; after the slurry is filtered, ethyl alcohol is removed, and then obtained third powder is collected and homogenized to obtain an n-Fe type simulated lunar dust finished product. The preparation method has the technical effect that the prepared n-Fe type simulated lunar dust finished product is a lunar dust simulant with physical and chemical properties, particle size distribution and surface appearance similar to those of real lunar dust.