328 results about "Oxide composite" patented technology

The invention relates to a preparation method of an etching-resistant and wear-resistant Y2O3-AlxOy composite coating. The preparation method comprises the following steps: carrying out ultrasonic cleaning on a corrosion-resistant matrix; performing plasma bombardment cleaning activation on the surface of the corrosion-resistant matrix; a Y2O3 coating and an AlxOy coating are alternately deposited on a corrosion-resistant base body in a double-target magnetron sputtering mode to form the Y2O3-AlxOy composite coating, the sputtering power of a Y target is larger than that of an Al target, and the ratio of x to y in the AlxOy coating is larger than 1. According to the method, the amorphous AlxOy coating dominated by the metal state is introduced into the Y2O3 coating, growth of Y2O3 columnar crystals is continuously broken, crystal grains are refined, formation of intergranular easy-to-etch point locations is inhibited, and an yttrium aluminum oxide composite strengthening phase is formed at an interface, so that plasma etching resistance is improved; the thickness of a single-layer coating in the composite coating is very thin; under the action of growth stress, the structure of the coating presents a wave-shaped microstructure and a soft and hard alternate mechanical structure, and the soft and hard alternate mechanical structure is beneficial to inhibiting generation of transverse cracks, guiding friction crack level expansion, prolonging the friction life of the coating and reducing the wear rate.

The invention discloses a high-entropy oxide composite negative electrode material as well as a preparation method and application thereof, and relates to the technical field of all-solid-state lithium battery negative electrode materials, and the high-entropy oxide composite negative electrode material comprises a metal element and an oxygen element, the high-entropy oxide composite negative electrode material comprises a metal element and an oxygen element, wherein the metal elements are at least five of a chromium element, an iron element, a nickel element, a manganese element, a molybdenum element, a copper element and a cerium element; the molar ratio of the metal element to the oxygen element is 3: 4; the high-entropy oxide composite negative electrode material is of a spinel structure. According to the prepared high-entropy oxide composite negative electrode material, the problems that a traditional negative electrode material is unstable in structure, poor in interface contact and short in cycle life are solved, the electrochemical performance is improved, and an all-solid-state lithium battery prepared from the high-entropy oxide composite negative electrode material shows high reversible specific capacity and excellent cycle stability.

The invention relates to the technical field of memristors, and provides a chitosan-based memristor which comprises a substrate, a buffer layer, a composite dielectric layer and a top electrode which are sequentially stacked from bottom to top, the buffer layer is formed by spin-coating a PEDOT: PSS aqueous solution on the substrate and then carrying out heat treatment; the composite dielectric layer is formed by spin-coating the buffer layer with an ultrasonic composite solution formed by a graphene oxide aqueous dispersion and a chitosan acetic acid solution and then carrying out heat treatment. By adopting a collaborative architecture of the chitosan-graphene oxide composite dielectric layer and the PEDOT: PSS buffer layer, the prepared bio-based memristor has the effects of relatively high switching ratio, relatively low operating voltage and good performance stability. Meanwhile, based on stable high and low resistance states of the device, all seven basic logic operations including a NOT gate, an AND gate, an OR gate, a NAND gate, a NOR gate, an XOR gate and an XNOR gate are completely realized on a single bio-based platform, the function accuracy can reach 100%, and an unexpected effect is achieved.

The invention discloses a preparation method of a lanthanum ferrite / zinc oxide composite material, which comprises the following steps: preparing lanthanum ferrite LFO, ultrasonically stirring ferric nitrate nonahydrate, lanthanum nitrate hexahydrate and a dispersing agent in a hydrothermal solvent to obtain a mixed solution, preparing an LFO / ZnO composite material, dispersing the LFO prepared in the step S1 and zinc acetate in ethanol, performing ultrasonic treatment, heating and stirring, and condensing and refluxing to obtain the LFO / ZnO composite material. Cooling, and continuously stirring in an ice-water bath; dropwise adding a NaOH ethanol solution at the temperature of 0 DEG C, and stirring for 2 hours; adding deionized water, stirring, centrifuging to remove the supernatant, dispersing the precipitate powder in ethanol, and carrying out hydrothermal reaction; after the hydrothermal reaction is finished, centrifuging the solution, and after centrifugation is finished, pouring out the solution to obtain a precipitate; washing with deionized water and an ethanol solution, drying the precipitate, and calcining the dried powder in a muffle furnace to obtain a p-n type LFO / ZnO composite material; according to the method, the size of lanthanum ferrite can be accurately regulated and controlled through a cooperative regulation strategy of the solvent proportion and the ligand size, and different types of gases can be accurately distinguished.

The invention discloses a high-temperature-resistant steel pipe anticorrosive coating and a preparation method thereof, and relates to the technical field of coatings. The high-temperature-resistant steel pipe anticorrosive paint is prepared from reinforcement modified silica sol, titanium dioxide, mica powder, a BYK-323 flatting agent and an FLOWLENAC-300 defoaming agent. A silicon carbide and carbon shell / reduced graphene oxide composite powder filler is used as a reinforcing body and is embedded into silica sol under the crosslinking effect, reinforcing body modified silica sol is formed, a highly-crosslinked and compact organic-inorganic hybrid composite network structure is presented, and then the reinforcing body modified silica sol is used as a continuous matrix of the coating to play a core role; the high temperature resistance and corrosion resistance of the coating are improved, the interface bonding force among the components can be enhanced, agglomeration and sedimentation of the filler in the storage and curing process are effectively prevented, the micropore defect is reduced, and the effectiveness and durability of protection of the high-temperature-resistant and corrosion-resistant coating are further enhanced.

The invention provides a moisture-proof corrugated board and a production process thereof. The moisture-proof corrugated board comprises inner paper, core paper and surface paper which are sequentially arranged, and the surfaces of the inner paper and the core paper are coated with moisture-proof coatings; the invention relates to a preparation method of an anti-aging agent. The moisture-proof coating is prepared from the following raw materials: 35 to 45 parts of waterborne acrylic resin, 10 to 16 parts of fluorine modified shape memory polyurethane, 8 to 12 parts of waterborne polyurethane dispersion, 4 to 8 parts of bamboo charcoal loaded nano silver-zinc oxide composite particles, 3 to 6 parts of hydrophobic nano silicon dioxide, 5 to 9 parts of chitosan modified nano cellulose, 1.5 to 2.5 parts of silane coupling agent, 0.8 to 1.2 parts of dispersing agent, 0.2 to 0.4 part of defoaming agent and 0.5 to 0.9 part of wetting leveling agent. The corrugated board provided by the invention has excellent moisture resistance, mildew resistance and structural stability.

The invention discloses a pH / temperature dual-response type quaternary ammonium salt-nano silver-zinc oxide composite antibacterial coating material as well as a preparation method and application thereof, and belongs to the technical field of antibacterial materials. The antibacterial effective life of the coated product is at least up to 5 years. The coating product is preferably a gastrointestinal endoscope, efficient bacteriostasis is achieved under the condition that the light transmittance of the gastrointestinal endoscope is not affected, biocompatibility is good, safety is high, precise controlled release of silver ions is achieved, and biotoxicity caused by sudden release of the silver ions is avoided. The quaternary ammonium salt-nano silver-zinc oxide composite coating material with the pH / temperature dual-response antibacterial effect is finally obtained through the steps of preparing a composite carrier material, loading antibacterial metal elements, constructing a pH / temperature dual-response polymer network and the like in sequence. A high-performance, safe and environment-friendly antibacterial coating system which is rapid in sterilization, precise in controlled release and long-acting in interference resistance is constructed, and an antibacterial solution with high technical adaptability is provided for the fields of medical treatment, food, water treatment and the like.

The application provides a ceria / yttria composite stabilized zirconia grinding medium and a preparation method. The method comprises the following steps: step one, mixing zirconia, ceria, yttria and kaolin, and then adding an appropriate amount of dispersant and water to obtain a slurry; step two, performing centrifugal spray drying on the slurry to obtain ceria / yttria composite stabilized zirconia powder; step three, adding the ceria / yttria composite stabilized zirconia powder into a binder, and then rolling to form a green body of spherical grinding medium; and step four, sintering and polishing the green body of spherical grinding medium to obtain the ceria / yttria composite stabilized zirconia grinding medium. The method can obtain low particle size and high specific surface area through high-temperature ball milling, and can also promote the solid solution of the stabilizer into the zirconia crystal lattice through heat treatment, so as to improve sintering activity, reduce sintering temperature and reduce production cost.

The invention discloses a polyimide-aluminum oxide composite film material and a preparation method thereof, the composite film material is composed of a polyimide layer and an aluminum oxide layer deposited and combined on the upper surface of the polyimide layer, and the thickness of the polyimide layer and the thickness of the aluminum oxide layer are both nanoscale; the composite film material is prepared by using atomic layer deposition equipment, and the preparation method comprises the following steps: firstly, depositing a nanoscale polyimide layer on a monocrystalline silicon piece carrier according to a set program by taking pyromellitic dianhydride and hexamethylenediamine as precursor raw materials; and depositing and combining a nanoscale aluminum oxide layer on the upper surface of the polyimide layer according to a set program by taking trimethylaluminum and distilled water as precursor raw materials. The prepared composite film material is different from a current composite film material prepared by blending polyimide and aluminum oxide and then carrying out film casting, the composite film material has a nano-scale polyimide layer with uniform thickness and a nano-scale aluminum oxide layer deposited and combined on the upper surface of the polyimide layer, and the composite film material has a good radiation refrigeration effect.

This invention discloses a high-voltage-gradient tin oxide varistor ceramic with adjustable nonlinear coefficients, its preparation method, and its applications, belonging to the field of functional ceramics and their preparation technology. This invention solves the problems of low voltage gradient, difficult-to-control nonlinear coefficients, and limited application in surge protection devices of existing SnO2-based ceramic materials. This invention employs multiple metal oxide composite doping and solid-state sintering to control the varistor performance of SnO2 ceramics through both doping and sintering processes.

This invention relates to a modified asphalt coating, an asphalt waterproof membrane, and their production method, belonging to the technical field of asphalt waterproof membranes. The modified asphalt coating comprises, by weight, the following raw materials: 50-60 parts petroleum asphalt, 5-10 parts SBS modifier, 10-15 parts organic montmorillonite-zinc oxide composite modifier, 20-30 parts inorganic filler, and 10-20 parts adhesive powder and additives. This invention achieves a synergistic effect between organic montmorillonite and asphalt through organic modification of montmorillonite and intercalation with zinc oxide to form an organic montmorillonite-zinc oxide composite modifier, and through nanoscale structural design, enabling the organic montmorillonite and asphalt to jointly construct a dense nano-barrier network within the asphalt. This network physically blocks small molecules in the asphalt while adsorbing asphalt fumes, which are then decomposed and fixed by metal oxide molecules. Simultaneously, it resists ultraviolet radiation and inhibits microorganisms on the asphalt surface, reducing the volatilization of asphalt fumes, thereby giving the asphalt waterproof membrane a smoke-suppressing and odor-neutralizing effect.

The invention belongs to the field of new materials, and discloses B-site doped perovskite type composite wave-absorbing ceramic as well as a preparation method and application thereof. The main phase of the composite wave-absorbing ceramic is LaMnxFe1 / 2 (1-x) Co1 / 2 (1-x) O3, and Cu-Zn oxide is compounded. The composite wave-absorbing ceramic not only has an excellent wave-absorbing effect, but also meets the requirement of thin thickness of a ceramic material. According to the preparation method of some examples of the invention, a method of simultaneously completing perovskite synthesis and compounding through one-step sintering is adopted to replace a conventional method of respectively synthesizing perovskite powder and Cu-Zn oxide and then compounding, energy is saved, and the preparation cost is greatly reduced. The preparation method is simple to operate, adopts a step-by-step reaction sintering method, ensures smooth synthesis of LaMnxFe1 / 2 (1-x) Co1 / 2 (1-x) O3, realizes densification of the composite ceramic, and can prepare the high-quality LaMnxFe1 / 2 (1-x) Co1 / 2 (1-x) O3 perovskite type Cu-Zn oxide composite ceramic.

This invention relates to the field of composite current collector base film materials, and discloses a heat-resistant and aging-resistant composite current collector base film and its preparation process. It is prepared by melt extrusion and stretching of the following raw materials in parts by weight: 100 parts PET resin, 12-25 parts multi-component composite reinforcing filler, and 0.5-3 parts lubricant. The multi-component composite reinforcing filler is prepared through the following steps: S1, halloysite nanotubes are composited with aminated mesoporous alumina, modified, and then loaded with an antioxidant to obtain functionalized halloysite nanotube-alumina composite particles; S2, magnesium oxide is deposited on graphene oxide, and modified to obtain a modified graphene oxide-magnesium oxide composite; S3, after blending, polymer grafting is performed to obtain the multi-component composite reinforcing filler. This invention, through the multi-component composite reinforcing filler in PET resin, can comprehensively improve the heat resistance, aging resistance, and bonding strength between the base film and the metal layer of the PET resin-based composite current collector base film.

This invention relates to the field of plasma surface treatment technology and discloses a plasma nitrogen oxidation composite treatment process for hydraulic cylinder piston rods. The process includes: low-temperature pulsed nitrogen-containing plasma treatment to form a non-porous metastable nitrogen solid solution substrate, during which the pulse timing is clamped to control the process temperature using an endogenous closed-loop rule; subsequently, a dense oxide film is grown in situ on this substrate. This invention reliably constructs a non-porous metastable nitrogen solid solution substrate by precisely controlling the low-temperature process window and suppressing parasitic heating through an endogenous thermal management closed loop, thus avoiding brittle phase precipitation defects. The in-situ grown oxide film is dense and firmly bonded, improving the corrosion resistance and service reliability of the piston rod.

The application discloses a flexible terahertz metamaterial sensor and a preparation method thereof, which comprises, from top to bottom, a reinforcing layer, a carbon nanotube film layer and a polymer substrate layer; the reinforcing layer is composed of a graphene and zinc oxide composite material; the reinforcing layer and the carbon nanotube film layer are consistent in shape and are both periodic strip structures. The super material sensor is based on the synergistic effect of a ternary system of zinc oxide / graphene / carbon nanotube, wherein zinc oxide nanoparticles grow directionally on a graphene sheet through a Zn-O-C bond, and a carbon nanotube film constructs a three-dimensional conductive network, thus solving the dielectric loss problem of a traditional noble metal-based sensor structure. The phonon resonance characteristics of zinc oxide are coupled with graphene plasmons, a high-efficiency charge transfer channel is formed at a heterojunction interface, and the conductivity and terahertz transmission efficiency are improved.

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 silicon-carbon composite negative electrode material and a preparation method thereof, the silicon-carbon composite negative electrode material comprises a core-shell active unit, a conductive network layer and a composite coating layer, the core-shell active unit is a structure formed by loading boron-doped silicon quantum dots in hollow carbon spheres; the composite material is prepared from the following components in percentage by mass: 11 to 18 weight percent of boron-doped silicon quantum dots, 24 to 36 weight percent of hollow carbon spheres, 31 to 42 weight percent of polyimide-derived nitrogen-doped carbon nanofibers, 3 to 8 weight percent of fluorophosphate-aluminum oxide composite coating layer and 2 to 5 weight percent of lithium titanate modified montmorillonite, the mass ratio of fluorophosphate to aluminum oxide in the fluorophosphate-aluminum oxide composite coating layer is 3: 1, the particle size of the boron-doped silicon quantum dots is 2-5nm, the doping amount of the boron element is 1-3at%, and the purity is not lower than 99.95%. The core-shell structure is used for buffering silicon expansion, the nitrogen-doped carbon fiber is used for constructing a high-efficiency conductive network, the composite coating layer is used for stabilizing an interface, and the inorganic dispersed phase is used for inhibiting agglomeration, so that the specific capacity, the cycling stability and the first charge-discharge efficiency of the lithium ion battery are remarkably improved.

The invention provides a gradient structure metal-oxide-non-oxide composite sliding plate and a preparation method, and relates to the technical field of sliding plate preparation within the steel smelting range. The outer layer of the gradient-structure metal-oxide-non-oxide composite sliding plate is a compact layer with the porosity smaller than or equal to 5%, the thickness ranges from 0.1 micrometer to 20 micrometers, and the phase composition of the gradient-structure metal-oxide-non-oxide composite sliding plate is Ti (C, N), (Al2OC) x (AlN) 1-x and corundum; the internal porosity of the gradient structure metal-oxide-non-oxide composite sliding plate is 10-20%, and the phase composition of the gradient structure metal-oxide-non-oxide composite sliding plate is Ti (C, N), (Al2OC) x (AlN) 1-x, Al-Ti alloy and corundum. The preparation of the metal-oxide-non-oxide refractory material with a compact surface layer structure is realized under the conditions of high temperature, nitrogen and low oxygen partial pressure by virtue of the regulation and control effect of TiO2 on a gas-phase mass transfer product and a material structure in a material sintering process; the method is simple and easy to operate, low in cost, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention discloses a metal oxide composite sodium ferric sulfate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The metal oxide composite sodium ferric sulfate positive electrode material comprises the following raw materials in parts by mass: 1-20 parts of sodium sulfate, 2-40 parts of ferrous sulfate, 0.05-1 part of an antioxidant, 0.05-1 part of a carbon source and 0.01-2 parts of metal oxide, the metal oxide is at least one of ferrous oxide, ferric oxide, ferroferric oxide, manganese oxide, manganese dioxide, cobalt oxide, cobaltosic oxide, cobaltic oxide, vanadium monoxide, vanadium dioxide, vanadium trioxide, vanadium pentoxide, nickel oxide and copper oxide. The invention also discloses a preparation method and application of the metal oxide composite sodium ferric sulfate positive electrode material. The method provided by the invention can solve the problems of low conductivity and specific capacity of the existing sodium ferric sulfate positive electrode material, and has the advantages of low cost, strong process adaptability and wide application prospect.

The invention aims to provide a preparation method and application of a nano-zinc oxide cellulose-based composite hydrogel film with antibacterial activity, and belongs to the field of food preservation. Comprising the following steps: preparing a sodium hydroxide-urea-water composite solvent system, pre-cooling to-12 DEG C, adding cellulose, stirring for 20 minutes to obtain cellulose slurry, adding 1.1 wt% of MBA cross-linking agent into the slurry, stirring at room temperature for 1.8 hours, respectively adding nano-zinc oxide powder into the slurry, stirring at room temperature for 1 hour until the materials are uniformly mixed, centrifuging at 1500 rpm for 10 minutes to remove suspended bubbles, and drying to obtain the nano-zinc oxide cellulose. And injecting the centrifugate into a flat glass plate mold, standing to complete gelation and film formation, after demolding, soaking in a weak acid solution and deionized water to be neutral, immersing the obtained gel into 10% w / v glycerol for solvent replacement, after 6 hours, cleaning the glycerol on the surface by using distilled water, and drying at 45 DEG C for 8 hours to prepare the nano-zinc oxide composite cellulose film. The strawberry fresh-keeping film is used for strawberry fresh-keeping, can effectively delay strawberry weightlessness, rotting and flavor substance loss, and has a fresh-keeping effect obviously better than that of a traditional PE film and non-packaging treatment.

The application provides a method for preparing carbon nitride-carbonate bismuth oxide composite nanosheets by a molten salt one-pot method, sodium bismuthate, melamine and sodium nitrate are mixed and uniformly ground to obtain a solid mixture; the solid mixture is heated at 350 DEG C, sodium nitrate is molten to form an ionic molten salt medium, and a one-pot reaction is simultaneously carried out in the medium: sodium bismuthate and melamine are converted into carbonate bismuth oxide through an oxidation-reduction reaction, melamine is simultaneously converted into graphite phase carbon nitride through a polymerization reaction, and the synergistically generated carbonate bismuth oxide and graphite phase carbon nitride are in-situ compounded to form g-C3N4-Bi2O2CO3 composite nanosheets. The application is based on a synthesis strategy of realizing multiple chemical reactions in a single molten salt environment, in-situ compounding to form a heterojunction, and simultaneously generating g-C3N4 and Bi2O2CO3 in one step and in-situ bonding, and the preparation steps are simple, the operation is convenient, the reaction conditions are mild, and the method is suitable for industrial production.

The application belongs to the technical field of nanomaterials, and particularly relates to a graphene oxide composite nanocoating, application thereof and modified dental metal material. The obtained graphene oxide composite nanocoating overcomes the problem of easy agglomeration of GO alone, has the advantages of long-term antibacterial property, strong corrosion resistance, low toxicity, good remineralization effect on dental enamel, reduced occurrence of dental demineralization and dental caries, effectively reduced friction between dental metal materials, especially between metal materials for orthodontic treatment, is conducive to the sliding between arch wires and bracket grooves in the orthodontic process, and further conducive to improving the efficiency of aligning and flattening the dental arch in orthodontic treatment and shortening the treatment course. In addition, the application has the characteristics of simple operation, low cost and strong controllability, and provides a simple and universal strategy for preparing dental metal materials with long-term antibacterial property, corrosion resistance, low toxicity, good remineralization effect and low friction.

A synthesis method for fabricating a three-dimensional energy storage foam comprising: preparing a first solution by dissolving a pre-determined amount of a polyvinyl alcohol in a pre-heated water, obtaining a second solution by adding a pre-determined amount of a vanadium salt to the first solution, producing a colloid mixture by adding a graphene oxide mixture to the second solution, obtaining a graphene oxide / polyvinyl alcohol / vanadium oxide composite by heating the colloid mixture in a pre-determined temperature under a hydrothermal condition for a pre-determined heating time, and fabricating the three-dimensional energy storage foam by heating the graphene oxide / polyvinyl alcohol / vanadium oxide composite to remove the polyvinyl alcohol under a calcining condition such that a plurality of vanadium oxide with a formula of V2O3 is decorated between the graphene oxide layers. The produced three-dimensional energy storage foam is configured to use as a working electrode for electrochemical hydrogen storage.

The utility model relates to the technical field of electrolysis, and discloses an electrolytic bath and an electrolysis system, the electrolytic bath comprises a bath body, a diversion assembly and an electrode assembly; the tank body is provided with a tank cavity, one end of the tank body is a liquid inlet end, and the other end is a liquid outlet end in the first direction; the flow guide assembly is arranged in the groove cavity, the flow guide assembly is connected to the cavity bottom face of the groove cavity, the flow guide assembly forms a guide flow channel extending in the first direction, a liquid inlet of the guide flow channel faces the liquid inlet end, and a liquid outlet of the guide flow channel faces the liquid outlet end; the electrode assembly is arranged in the groove cavity, and the electrode assembly is located in the guide flow channel; wherein the groove body is provided with a plurality of aeration holes, the aeration holes are formed in the cavity bottom surface and used for inputting inert gas into the guide flow channel, when the metal and graphene oxide composite material is prepared, the guide flow channel can guide a reaction solution to uniformly flow in the first direction, and metal particles can be prevented from sinking to the bottom by inputting the inert gas into the guide flow channel through the aeration holes; on the basis, the graphene oxide can be uniformly coated on the surfaces of the metal particles.

The invention discloses an oil-stain-resistant and wear-resistant efficient protective rare earth coating and a preparation method thereof. The coating is composed of 50-70 parts of tungsten carbide powder, 10-20 parts of cobalt-coated tungsten carbide composite powder, 8-15 parts of yttrium-stabilized zirconia powder, 5-12 parts of rare earth oxide composite powder and 5-10 parts of nickel-chromium-aluminum-yttrium alloy bonding powder, wherein rare earth oxide is a mixture of cerium oxide and lanthanum oxide. The preparation method of the coating comprises the steps of base body sand blasting coarsening and cleaning, three-dimensional mixing of all component powder and high velocity oxy-fuel spraying deposition. Decarburization of tungsten carbide is inhibited through a cobalt coating structure, composite rare earth is utilized to refine grains and reduce surface energy, and an optimized spraying process is combined, so that the coating has high hardness, high bonding strength, low porosity, low wear rate and excellent oleophobicity, the problems that a traditional wear-resistant coating is easy to adhere, difficult to clean and short in service life in a greasy dirt environment are effectively solved, and the service life of the coating is prolonged. The coating is suitable for surface protection of key parts such as hydraulic machinery and aero-engines.

This invention relates to the manufacture of metal powders and discloses a controllable preparation method for semiconductor-grade ultrafine spherical aluminum powder, comprising: preparing a composite molten salt composed of a matrix salt and an interface pinning agent calcium fluoride and heating it to a dispersion temperature to form a homogeneous melt; shearing and dispersing liquid aluminum in the melt; performing temperature-controlled dissolution, controlling the cooling rate to allow calcium fluoride to precipitate in situ and adsorb before the aluminum droplets solidify, forming a physical pinning shell layer; and restricting solidification and removing the salt medium. This invention utilizes the temperature-dependent solubility characteristics to construct a microscopic physical barrier before the droplets solidify, effectively blocking droplet aggregation through steric hindrance, achieving high sphericity and extremely narrow particle size distribution of the aluminum powder; simultaneously, it utilizes calcium fluoride microcrystals to induce the formation of a dense fluorinated aluminum oxide composite passivation layer, improving the powder's resistance to electrochemical migration and insulation reliability.

The invention relates to the technical field of preparation of lead-free metal halide scintillator crystal powder, and particularly discloses chlorine zirconium cesium crystal powder for a composite scintillator and a confinement growth method of the chlorine zirconium cesium crystal powder. The cesium zirconium chloride crystal powder is cesium zirconium chloride-gas phase oxide composite powder formed on the micro-nano scale by means of in-situ crystallization, and the cesium zirconium chloride crystal powder is composed of 50-95.3 wt% of cesium zirconium chloride and 4.7-50 wt% of gas phase oxide. The preparation method comprises the following steps: preparing zirconium chloride-gas phase oxide powder, preparing a cesium chloride solution, mixing zirconium chloride-gas phase oxide slurry, and growing chlorine zirconium cesium crystal powder in an in-situ crystallization confinement range. The cesium zirconium chloride crystal powder prepared by the method has the advantages of adjustable particle size, stable suspension and efficient scintillation luminescence performance, solves the problem of crystal powder-polymer phase separation in a composite scintillator, and can be used for large-scale preparation of the composite scintillator in the field of radiation detection.

The invention discloses a wafer room temperature bonding method and application thereof, and belongs to the technical field of semiconductor advanced packaging and three-dimensional integration. The method comprises the following steps: providing a first wafer, and sequentially preparing a metal plane layer and an oxide layer on the surface of one side of the first wafer to form a metal / oxide composite layer; selectively etching the metal / oxide composite layer to remove the oxide layer and form a metal nanowire array layer on the metal plane layer; providing a second wafer, and preparing a metal material layer on the surface of one side of the second wafer; and aligning the surface, with the metal nanowire array layer, of the first wafer with the surface, with the metal material layer, of the second wafer, and then bonding. According to the invention, the metal nanowire array is introduced into the bonding interface, so that the nanowires are subjected to plastic deformation and local surface diffusion under the action of external pressure, that is, compact and reliable metal-metal bonding can be realized in a room temperature environment, and the requirements of a low-temperature process window and high strength are both considered.

The invention discloses a composite material ceramic filter screen for casting and a photocuring 3D printing preparation method. Ansys Fluent fluid dynamics software is used, modeling analysis is conducted on the flowing state of molten metal liquid flowing through the filter screen in the pouring process, and the optimal filter screen design is obtained. The photocuring 3D printing silicon oxide ceramic filter screen comprises the following components in percentage by mass: 65-80% of silicon oxide powder, 10% of magnesium oxide powder, 2-8% of a dispersing agent, 1-3% of a photoinitiator, 9-15% of photosensitive resin and 1% of an anti-settling agent. According to the method, a porous polyurethane plastic carrier is not needed, the filter screen ceramic biscuit is directly obtained by using the silicon oxide slurry and the silicon oxide and magnesium oxide composite slurry in a photocuring 3D printing mode, and then the finished silicon oxide ceramic filter screen is obtained through degreasing and high-temperature sintering. According to the method, it is guaranteed that the product has meshes which are completely consistent in size and shape, the structural strength is high, and the product is not prone to being damaged, large-size inclusions in molten metal are physically screened through the meshes, non-metallic inclusions (such as AlO, SiO and sulfide) are actively captured through the reaction of magnesium oxide and the inclusions, and through the double means of physical interception and chemical capture, the content of impurities in the molten metal is greatly improved. The filtering performance is effectively ensured. In the production process of the product, ceramic chips without structural support are not generated, so that the production process link is simplified, and meanwhile, the emission of toxic and harmful waste materials is reduced.

The invention relates to the technical field of graphene oxide composite membrane water treatment, and discloses a novel graphene oxide composite membrane with a persistent dye separation function and a preparation method thereof.The preparation method of the novel graphene oxide composite membrane with the persistent dye separation function comprises the following steps that graphene oxide and UiO-66-NH2 are prepared; the preparation method comprises the following steps: preparing a TBO (at) UiO-66-NH2 / GO composite solution containing graphene oxide, UiO-66-NH2 and a toluidine blue O solution; the TBO-coated UiO-66-NH2 / GO composite liquid is loaded to the surface of a PES film, and the novel graphene oxide composite film with the persistent dye separation function is obtained; according to the novel graphene oxide composite membrane disclosed by the invention, a'vertical support-horizontal screening 'synergistic structure is constructed, and the dye separation performance and stability of the membrane are remarkably improved.