87 results about "Nano al2o3" patented technology

The present application relates to the field of high-speed spraying technology, in particular to a supersonic flame spraying process for steam turbine blades. The present application overcomes the problems of insufficient coating bonding strength and poor corrosion resistance of the supersonic flame spraying. The present application uses nickel-coated alumina composite sand for sandblasting pretreatment of the blades to achieve micro-implantation of active nickel; adjusts the ratio of NiCr and Cr3C2-NiCr powders by using double powder feeders to build a gradient structure coating with continuous component change; uses a modified sealing agent containing nano-alumina for vacuum impregnation sealing; and finally obtains finished blades through graded vacuum diffusion annealing. Through surface nickel implantation, gradient structure design and diffusion annealing, the present application realizes metallurgical bonding and thermal stress matching between the coating and the substrate, greatly improving the bonding strength; at the same time, the in-situ ceramicization reaction of the sealing agent eliminates micro-pores, significantly enhancing the corrosion resistance of the coating.

The application belongs to the technical field of geological compositions, and particularly relates to a fly ash-based high-density geological composition, a preparation method thereof and application thereof in road engineering. The fly ash-based high-density geological composition comprises the following components in mass fractions: fly ash 50-60 parts; slag 20-30 parts; metakaolin 7-12 parts; modified nano Al2O3 2-4 parts; modified polypropylene fiber 1.0-2.0 parts; silica ash 3-8 parts; alkali activator 30-40 parts; and water 15-20 parts. The application provides a fly ash-based geological composition which has normal-temperature bending strength, compressive strength and excellent freeze-thaw resistance.

The utility model provides a stackable high-temperature shielding adhesive tape roll. The stackable high-temperature shielding adhesive tape roll comprises an adhesive tape inner cylinder and an adhesive tape body wound on the outer surface of the adhesive tape inner cylinder, the adhesive tape inner cylinder comprises a limiting groove, a cylinder body and a limiting block; one end of the barrel is provided with a limiting groove, and the other end of the barrel extends to form a limiting block; the limiting blocks are matched and connected with the limiting grooves; the adhesive tape body comprises a nano aluminum oxide coating, a base material layer, a composite adhesive layer and a release film layer; the surface of the base material layer is coated with nano aluminum oxide to form a nano aluminum oxide coating, and the other surface of the base material layer is provided with a composite adhesive layer; and a release film layer is arranged on the other surface of the composite adhesive layer. The limiting blocks are arranged to be matched with the limiting grooves, and the trapezoid-rectangle matching design is adopted, so that rapid alignment and rigid locking are achieved; and the rotating shaft is arranged in the barrel, so that the adhesive tape can be stably held by a single hand, smooth tearing is ensured, high-temperature warping can be reduced, and the using fitting degree of the adhesive tape is improved.

This invention relates to the field of heat exchange materials technology, and discloses a high-temperature, high-pressure nano-conductivity heat exchange material. The heat exchange material comprises a metal matrix, a linearly distributed metal-ceramic gradient transition layer, and a nano-composite ceramic surface layer. The surface layer consists of 90-95 parts of nano-alumina and zirconium oxide composite powder and 5-10 parts of cubic phase nano-titanium nitride powder. The former is fused and stacked to form a continuous ceramic matrix, while the latter is monodispersed and anchored within it, with adjacent particles in contact. The heat exchange material is prepared by gradient layer spraying with a linearly decreasing plasma current as the ceramic composition increases, followed by back-side cooling of the matrix. The surface layer is sprayed using a coaxial air knife in a reducing atmosphere combined with a low-enthalpy jet to inhibit oxidation and vacuum diffusion annealing. This invention synergistically regulates the above-mentioned structure and interface state to achieve a balance between high thermal conductivity, excellent corrosion resistance, and high bonding strength, which helps extend the service life of heat exchange components under high-temperature and high-pressure environments.

The utility model discloses a PTC heater structure, including a plurality of PTC heating tube, a plurality of radiating fins and mounting seat, a plurality of PTC heating tube installation is positioned on mounting seat, and a plurality of radiating fins interval arrangement sets up on PTC heating tube, still be provided with corrugated elastic metal sheet between a plurality of radiating fins and mounting seat, the corrugated elastic metal sheet is nickel base alloy material quality, a plurality of radiating fins and mounting seat are all aluminum material quality, the contact surface of a plurality of radiating fins is close to PTC heating tube and has coated nano alumina heat conduction coating, like this, through the elastic deformation absorption vibration energy, and gradient thermal expansion design, reduce the thermal stress, reduce the mechanical stress between mounting seat and fin aluminum pipe, prevent the connection loose after long -term use.

The application discloses a kind of super-hydrophobic self-cleaning paint for mortar mixing barrel, coating and preparation method thereof.The paint includes, by mass fraction: epoxy resin 10-15 parts, epoxy modified silicone resin 5-15 parts, hydroxyl functionalized submicron alumina 15-20 parts, isocyanate functionalized nano-alumina 5-10 parts, dispersion medium 50-60 parts and auxiliary agent 0.5-2.5 parts.The application forms core-shell structure by two kinds of functionalized alumina chemical bonding, combines epoxy modified silicone resin, and constructs stable micro-nano composite rough surface.The coating prepared from the paint has static water contact angle of 165° or more, still maintains super-hydrophobic property after 50 times of sandpaper abrasion and 7 days of high temperature treatment at 180℃, and surface morphology is perfect after 50 days of simulated seawater immersion, solving the problem that existing coating is difficult to consider super-hydrophobic, wear-resistant, high-temperature resistant and corrosion-resistant property.

The application relates to the field of building materials and discloses a sound and heat insulation light building material and a preparation method thereof. The light building material comprises cement, fly ash, river sand, quartz sand, a foaming agent, a modified composite filler-based water reducing agent and water. The foaming agent is made of sodium dodecyl sulfate, hydroxypropyl methyl cellulose, modified nano-aluminum oxide and nano-silicon dioxide. The modified nano-aluminum oxide is prepared by the following steps: reacting oleic acid with nano-aluminum oxide, emulsifying through a Pickering emulsion method, and selectively dissociating through a saponification reaction induced by sodium hydroxide. The modified composite filler-based water reducing agent is prepared by the following steps: in-situ esterification modification of a composite filler made by grafting isoprenyl alcohol polyoxyethylene ether on graphene oxide and carbon fiber, and then free radical copolymerization with acrylic acid. The light building material prepared by the application has high compressive strength and flexural strength, small water absorption and good heat insulation performance.

This invention relates to the field of battery materials technology, specifically to an alumina coating, its preparation method, and its application. The alumina coating includes a positive electrode coating slurry formed on the surface of a positive electrode and / or a negative electrode coating slurry formed on the surface of a negative electrode. The positive electrode coating slurry includes nano-alumina powder, a first solid electrolyte, a first film-forming aid, a first binder, a first dispersant, and a first solvent. The negative electrode coating slurry includes nano-alumina powder, a second solid electrolyte, a second film-forming aid, a second binder, a second dispersant, and a second solvent. The preparation method includes: providing positive / negative electrode sheets to be coated; preparing positive / negative electrode coating slurries of a preset viscosity; and applying the slurries to the electrode surface using an atomization spraying method to form an alumina coating. This invention significantly improves the adhesion between the coating and the electrode, interface uniformity, and ionic conductivity by combining differentiated positive and negative electrode formulations with a semi-dry atomization spraying process.

The application provides a crosslinked polyethylene insulated cable and a preparation process thereof, and belongs to the technical field of cables, and comprises the following steps: step S1, preparing UiO-66-F4 masterbatch; step S2, preparing hexagonal boron nitride masterbatch and nano-alumina masterbatch; step S3, preparing insulation granules; step S4, performing three-layer co-extrusion on a copper core conductor to form a conductor shielding layer / insulation layer / insulation shielding layer, and then performing CV crosslinking, cooling, degassing, and then coating a metal braided shielding layer and an outer sheath to obtain the crosslinked polyethylene insulated cable. The application can improve the DC breakdown strength and long-term insulation stability of the crosslinked polyethylene insulated cable.

The application discloses a double-layer insulation-coated soft magnetic composite material with a high-thermal-conductivity network structure and a preparation method thereof. First, a surfactant is used to perform surface modification treatment on soft magnetic powder, and an Al2O3 insulation coating layer with high resistivity and high thermal conductivity is formed on the surface of the modified soft magnetic powder in situ through a sol-gel reaction. Then, the magnetic powder coated with the Al2O3 insulation layer is uniformly mixed with a composite resin doped with dendritic nano Al2O3 powder, a second thermal-conductivity shell layer is constructed on the outer layer of the magnetic powder, and a composite powder with a double-layer insulation-coated structure is formed. The obtained composite powder is sequentially subjected to granulation, compression molding and low-temperature solidification treatment, so that the target soft magnetic composite material is prepared. According to the double-layer coating process, a continuous and through thermal-conductivity network is successfully constructed in the composite material, so that the overall heat dissipation efficiency of the composite material is remarkably improved, and the current can be efficiently insulated.

The application provides wear-resistant and scratch-resistant high-hardness nano-alumina modified polypropylene composite veneer and relates to the field of high polymer composite materials, which comprises a veneer main body, a wear-resistant and scratch-resistant surface layer, a reinforced support middle layer, an elastic fitting inner layer and a sticking auxiliary assembly; the veneer main body adopts a multilayer composite structure, and the veneer main body is sequentially provided with the wear-resistant and scratch-resistant surface layer, the reinforced support middle layer and the elastic fitting inner layer from outside to inside; the wear-resistant and scratch-resistant surface layer, the reinforced support middle layer and the elastic fitting inner layer are tightly connected into an integrated whole through a composite forming process; the wear-resistant and scratch-resistant surface layer is a nano-alumina modified polypropylene layer; the reinforced support middle layer is a glass fiber reinforced polypropylene layer; and the elastic fitting inner layer is a modified polypropylene elastomer layer, which improves the sticking efficiency of the whole veneer and solves the problem that the existing composite veneer bubbles need to be removed point by point by workers through scrapers, which is complicated and time-consuming.

The application relates to a high-weather-resistance multifunctional rail transit polymer coating as well as a preparation method and application thereof, and relates to the technical field of rail transit coatings. The high-weather-resistance multifunctional rail transit polymer coating comprises an A component and a B component; the A component comprises the following substances in a mass fraction: 25-35% of silicone-modified acrylic resin; 5-10% of nano-silicon dioxide loaded polyacrylic resin; 4-8% of functionalized nano-aluminum oxide-nano-cerium oxide composite material; 25-35% of titanium white powder; 0.5-1.0% of a dispersing agent; and 20-30% of a solvent; the B component comprises the following substances in a mass fraction: 70-80% of isocyanate resin; and 20-30% of a solvent. The high-weather-resistance multifunctional rail transit polymer coating has excellent weather resistance, wear resistance, acid and alkali resistance, anti-yellowing property, water and oil resistance, high gloss, stain resistance and other multifunctional properties through the synergistic effect of the components.

This invention relates to the field of cable technology and proposes a corrosion-resistant insulated wire and cable. The corrosion-resistant insulated wire and cable comprises, from the inside out, a conductor layer and an insulating outer sheath layer. The insulating outer sheath layer comprises the following raw materials in parts by weight: 22-30 parts epoxy resin, 10-15 parts polytetrafluoroethylene, 4-5 parts silane coupling agent, 15-20 parts core-shell structured composite inorganic filler, 9-10 parts corrosion resistant agent, 4-5 parts flame retardant, and 35-45 parts deionized water; wherein the core-shell structured composite inorganic filler consists of a porous nano-alumina microsphere core and a boron nitride nanosheet shell covering its surface. The corrosion-resistant insulated wire and cable prepared in this invention improves the material's mechanical strength, insulation performance, and chemical corrosion resistance.

This invention proposes a polyimide film, its preparation method, and its applications, relating to the field of thin film materials. By weight, it comprises the following raw materials: 50-100 parts dimethylformamide, 5-10 parts diaminodiphenyl ether, 10-20 parts phenylenediamine, 1-2 parts core-shell structured silica-alumina particles, 25-30 parts pyromellitic dianhydride, 1-2 parts organically modified montmorillonite, 1-2 parts aminated thermally conductive particles, 50-100 parts acetic anhydride, and 5-10 parts pyridine; wherein the core-shell structured silica-alumina particles are a composite material with polydopamine as the shell and nano-silica and nano-alumina as the core; the organically modified montmorillonite is obtained by intercalation modification of montmorillonite with an organic compound containing hydroxyl groups; the aminated thermally conductive particles are obtained by graft modification of nitrides with an organic compound containing amino groups. It exhibits good high-temperature resistance, high-pressure breakdown resistance, and thermal conductivity, as well as high mechanical strength and long service life.

The application discloses a kind of lithium battery diaphragm and its preparation method, and the lithium battery diaphragm includes base film and coating on base film, and the coating is obtained by coating lithium battery diaphragm slurry, and the lithium battery diaphragm slurry includes: nano-aluminum oxide and sodium alginate composite hydrogel.The application is prepared by coating lithium battery diaphragm slurry with nano-aluminum oxide as main material and adding sodium alginate composite hydrogel solution on the surface of base film to obtain diaphragm, improve the heat resistance and insulation of base film, solve the problem of serious heat shrinkage of prior art diaphragm, thereby improve the safety of lithium battery, and also can improve the liquid absorption and liquid retention of diaphragm.

This invention belongs to the field of composite ceramics technology, specifically relating to a shell-like composite ceramic with both high strength and toughness, its preparation method, and its applications. The composite ceramic obtained by this invention possesses a layered micro-heterogeneous structure resembling a shell, comprising a "brick" layer composed of sheet-like alumina and a first whisker, and a "mud" layer composed of nano-alumina particles, a second whisker, and nanosheets. The "brick" and "mud" layers are alternately stacked. Specifically, the material composition and structure are precisely controlled through multiple freeze-drying processes to establish the micro-heterogeneous structure, which is then combined with hot-pressing sintering to obtain the composite ceramic with the shell-like micro-heterogeneous structure. The composite ceramic prepared by this invention exhibits excellent flexural strength and fracture toughness, and has broad application prospects in the fields of machinery, electronics, and aerospace.

This invention relates to the field of metal surface treatment technology, specifically to tin-plated copper wire for preventing tin plating layer peeling and its production process. The production process of the tin-plated copper wire for preventing tin plating layer peeling includes: preparing a nano-alumina-pillared nano-graphene sheet composite material; pretreatment; pulse electroplating; post-plating washing; and passivation sealing. This invention first disperses carboxyl-modified graphene in anhydrous ethanol, then adds an aluminum source precursor. Electrostatic self-assembly allows the aluminum source to be adsorbed onto the graphene sheet surface. After acid-catalyzed gelation, aging, and calcination heat treatment, a nano-alumina-pillared nano-graphene sheet composite material is obtained. This composite material is then added together with polytetrafluoroethylene (PTFE) particles to a mixed tin plating solution. After pulse electroplating of the pretreated copper wire, the nano-alumina-pillared nano-graphene sheets and PTFE particles synergistically improve the bonding force between the tin plating layer and the copper wire substrate, thereby effectively preventing tin plating layer peeling.

This application relates to the field of chemical coating technology, and discloses an easy-to-clean coating for glass surfaces and its preparation method. The coating includes a spraying liquid, which, by weight, comprises the following raw materials: 3-4 parts by weight of zinc oxide nanowires modified with KH-560; 9-10 parts by weight of nano-alumina modified with KH-550; 6-8 parts by weight of hydroxyl-terminated polydimethylsiloxane; 2-4 parts by weight of tetraethyl orthosilicate; and 80-100 parts by weight of anhydrous ethanol. The easy-to-clean glass surface coating of this application, by employing a combination of zinc oxide nanowires and nano-alumina fillers and modifying them with different coupling agents, combined with other raw materials in the system, enables the coating to simultaneously possess excellent hydrophobicity, durability, hardness, adhesion, and antibacterial properties.

This invention discloses a method for preparing a fluorine-free heating and insulating riser, relating to the field of casting technology. The method includes first modifying micron-nano composite aluminum powder with a silane coupling agent, then in-situ reducing and loading zero-valent iron-cerium dioxide catalytic sites, followed by sequentially coating with phenolic resin and a potassium nitrate-manganese dioxide composite oxygen source, and finally forming a silica shell through interfacial hydrolysis and condensation to obtain a core-shell structured composite heating agent. Separately, hollow aluminosilicate microspheres are etched to create pores, then vacuum-impregnated and filled with an organic-inorganic composite aerogel, followed by hydrophobic modification and coating with nano-alumina sol to obtain a composite insulating material. The heating agent is then mixed with the insulating material, mullite powder, corundum powder, expandable graphite, waste glass powder, and a binder, and the mixture is vibrated, compacted, and allowed to cure to obtain the finished product. This invention solves the problems of difficult heating and poor insulation in fluorine-free risers by constructing a multi-level core-shell heating structure and a porous, multi-level insulating structure.

The present application relates to the technical field of ground composite material, and provides a production process of UV-resistant ground composite material, which comprises, from top to bottom, an UV-resistant polyurethane coating layer, a wear-resistant layer, a glass fiber mesh cloth impregnated epoxy resin layer, a base layer and a polyester fiber cloth substrate; the UV-resistant polyurethane coating layer is 20-50 microns thick and is composed of UV-cured aliphatic polyurethane acrylate resin containing a composite photoinitiator; the wear-resistant layer is 30-80 microns thick and is composed of UV-cured modified polyurethane resin added with nano-aluminum oxide wear-resistant filler; the glass fiber mesh cloth impregnated epoxy resin layer is 0.1-0.3 mm thick and is formed by completely impregnating alkali-free glass fiber mesh cloth in modified epoxy resin glue solution and then curing; the base layer is formed by mixing bisphenol A type modified epoxy resin and inorganic filler and then curing, and is 1.0-3.0 mm thick; and the polyester fiber cloth substrate is a bearing layer and has a grammage of 100-200 g / m 2 After UV aging for 1000 h, the color difference ΔE is less than or equal to 1.7, the tensile strength retention rate is greater than or equal to 93%, and the outdoor service life can reach 10-12 years, which is 5-6 times that of traditional epoxy ground materials.

The application discloses a graphene heat-conducting polymer material and a preparation method thereof, relates to the technical field of graphene heat-conducting polymer materials, and comprises the following components: 100 parts of vinyl silicone rubber, 12-25 parts of phenyl-modified siloxane, 15-40 parts of modified graphene, 180-420 parts of spherical alumina, 30-120 parts of flaky boron nitride, 5-25 parts of nano-alumina, 8-20 parts of vinyl MQ resin, 2-10 parts of hydrogen silicone oil crosslinking agent, 1-6 parts of amino-containing silane coupling component, 0.5-4 parts of epoxy-containing silane coupling component, 0.01-0.2 parts of platinum-based catalytic component and 0.01-0.08 parts of inhibiting component. The application optimizes the interface structure by double coupling and nano-alumina, reduces the interface thermal resistance, constructs a complete heat-conducting network by synergistic effect of multi-scale fillers, improves the overall heat-conducting performance, and optimizes the heat-resistant stability and long-term use reliability through a crosslinking network.

This invention discloses an alumina-based thermal shock resistant composite material and its preparation process, belonging to the field of composite material technology. The process includes gradient preform preparation, reinforcement interface modification, directional arrangement of thermal stress buffer units, in-situ reaction electric field-assisted sintering, and steam pre-oxidation post-treatment steps. This invention employs a three-layer micro-gradient structure design. The surface layer relies on nano-alumina and SiC whiskers, possessing both high hardness and wear resistance. The middle layer, through phase transformation toughening, effectively absorbs crack propagation energy and inhibits crack extension. The core layer uses porous mullite composite, whose low coefficient of thermal expansion significantly buffers thermal stress. Structurally, this design balances high strength and high toughness, improving the material's flexural strength, fracture toughness, and thermal shock resistance, and preventing through-crack formation under thermal shock.

This invention provides a spherical aluminum nitride powder with narrow particle size distribution and good flowability, and its preparation method, belonging to the field of spherical powder preparation technology. The preparation method of the spherical aluminum nitride powder includes the following steps: (1) dissolving ammonium polyacrylate and citric acid in an ethanol aqueous solution, then mixing nano-alumina powder and carbon powder at a weight ratio of 72-76:24-28 and adding them to the above solution to prepare a slurry; (2) spray granulating the slurry obtained in step (1) at 100-120℃ to obtain a precursor; (3) sintering the precursor under a nitrogen atmosphere at a pressure of 0.1-0.4 MPa and a sintering temperature of 1650-1700℃ for 2 hours to obtain spherical aluminum nitride powder. The spherical aluminum nitride powder prepared by this invention has the characteristics of narrow particle size distribution, high sphericity, good sphericity, good flowability and resistance to deformation, and has better application prospects in the field of filler materials.

This invention discloses a high-strength triple-insulated wire, comprising a conductor core, the outer surface of which is wrapped with a first insulation layer, and the outer surface of the first insulation layer is wrapped with a second insulation layer. In this invention, a polyetheretherketone (PEEK) reinforcing layer between the conductor core and the first insulation layer, with its high tensile strength and long-term temperature resistance, solves the problem of weak resistance to external forces in conventional triple-insulated wires. A wear-resistant coating (nano-alumina modified epoxy resin) on the outer surface of the third insulation layer forms a dual wear-resistant protection system with the third insulation layer (polytetrafluoroethylene), significantly improving the surface wear resistance compared to conventional insulated wires. During installation, the coating resists frictional damage caused by dragging. Furthermore, the tape-type adhesive surface and release paper design reduce vibration friction by quickly fixing the wire, further reducing the probability of wear and significantly extending the service life of the insulated wire.

The application relates to the technical field of insulating materials, in particular to a high-temperature-resistant insulating mica tape and a preparation method thereof, which is formed by compounding and solidifying a mica paper layer, a reinforcing material layer and a high-temperature-resistant adhesive coated on the adhering surfaces of the two layers; the high-temperature-resistant adhesive comprises an organic silicon resin compound, a ternary high-temperature-resistant filler, a silane coupling agent, a curing agent and a diluent; the organic silicon resin compound is compounded by methylphenyl silicon resin and phenyl vinyl silicon resin; and the ternary high-temperature-resistant filler is a mixture of nano-aluminum oxide, nano-magnesium oxide and mica powder. The high-temperature-resistant insulating mica tape and the preparation method thereof effectively solve the technical problems of low temperature resistance, poor high-temperature aging performance and insufficient mechanical and insulating performance of traditional mica tapes, and the overall performance is comprehensively improved.

The application relates to the technical field of heat storage and energy storage, and discloses a heat storage and energy storage molten salt material and a preparation method and application thereof, the method comprises raw material pretreatment, molten salt system preparation, additive modification, vacuum melting treatment, step cooling and heat treatment, and crushing and screening; by adding nano-aluminum oxide and carbon nanotubes as the additives into a ternary basic molten salt mixture, the thermal conductivity and the thermal stability of the molten salt material are improved, meanwhile, the introduction of nucleating agents promotes the uniformity of molten salt crystallization, so that the phase change latent heat and the recycling service life of the material are enhanced, and the reliability of the heat storage and energy storage performance is ensured; the preparation process of vacuum melting treatment combined with step cooling and heat treatment is adopted, bubbles and impurities in the molten salt are removed, the high purity and the compactness of the microstructure of the material are ensured, and by controlling the cooling rate and the heat preservation and ripening process, the crystal structure of the molten salt is optimized, and the thermal stability and the use temperature range of the material are improved.

The application discloses a kind of composite adsorbing material for nitrogen production process and its preparation method, it is related to gas separation material technical field.The composite adsorbing material includes: surface modification carbon molecular sieve 30~50 parts, modified silica gel 20~40 parts, silicon solution 5~10 parts, nano alumina 2~5 parts;Surface modification carbon molecular sieve is carbon molecular sieve after acid solution oxidation treatment, and modified silica gel is silica gel after modification treatment by ammonium salt solution.The preparation method includes: respectively surface modification and modification are carried out to carbon molecular sieve and silica gel;Mixing, crushing and sieving;Add silicon solution, nano alumina and water to pulp;Compression molding;Cooling after high-temperature sintering under protective atmosphere.The application enhances oxygen adsorption and impurity adsorption capacity by surface modification, improves stability and strength by combining silicon solution and nano alumina, realizes efficient nitrogen-oxygen separation and simultaneously removes impurities, simplifies nitrogen production pretreatment, improves nitrogen purity and nitrogen production efficiency, and the process is simple and easy to industrial production.

This invention relates to the field of UAV propeller technology, and discloses a layered carbon fiber composite multi-rotor UAV propeller and its preparation method. The propeller adopts a functionally graded layered composite structure, consisting of, from the inside out, a core load-bearing layer, an internally built-in high-toughness crack-arresting layer symmetrically arranged on the upper and lower sides of the core load-bearing layer, and a surface damping layer symmetrically arranged on the outside of the internally built-in high-toughness crack-arresting layer. The leading edge region of the surface damping layer has a nano-alumina wear-resistant reinforcement layer, and the entire propeller has a mirror-symmetrical structure along its thickness center. During preparation, a semi-cured wear-resistant reinforcement layer is first prepared on the leading edge of the upper and lower molds, and then the surface damping layer, crack-arresting layer, and core load-bearing layer are sequentially laid and mirror-symmetrically stacked. The propeller is then obtained through mold closing, vacuuming, stepped temperature-controlled pressure co-curing, and slow cooling. The propeller of this invention combines high load-bearing capacity, high toughness, excellent erosion resistance, and damping vibration reduction performance, significantly improving flight safety redundancy and service life.

The utility model discloses a kind of high-temperature-resistant mobile phone mainboard upper cover assembly, including metal substrate layer and composite heat dissipation layer, metal substrate layer, made of aluminium alloy or magnesium alloy, its outer surface is equipped with micro-arc oxidation insulating layer;Composite heat dissipation layer is inlaid in the inner side of metal substrate layer by hot-pressing process, and is composed of ceramic fiber cloth layer, nano alumina coating and heat-conducting silicone layer sequentially arranged from inside to outside;The thickness of the nano alumina coating is 10-50 μm, and porosity is ≤5%.The high-temperature-resistant mobile phone mainboard upper cover assembly described in the utility model, through the synergistic effect of triple composite heat dissipation structure, significantly improve the heat dissipation efficiency, micro-arc oxidation insulating layer provides stable insulation protection, withstand high-temperature environment, air vent and through type heat dissipation channel enhance air convection, reduce core area temperature.

This invention discloses a high-temperature solid particle interseasonal thermal storage system, comprising a vertical silo body, a closed gas circulation loop, and a heating device. The vertical silo body is filled with a solid particle thermal storage medium, which is surface-modified and coated with a nano-alumina coating. It also includes a multi-component composite insulation structure covering the silo wall, consisting of, from the inside out, a high-alumina refractory brick layer, a ceramic fiber blanket buffer layer, a nano-aerogel felt layer, and a microporous calcium silicate board layer. A sloped temperature layer control module is used to calculate the position and thickness of the sloped temperature layer in real time based on an effective thermal diffusivity model, maintaining the sloped temperature layer thickness within a set range. A multi-scale simulation prediction control unit is used to predict the sloped temperature layer trajectory in advance and calibrate and update the effective thermal diffusivity model. This invention enables large-scale, long-term (half-year) interseasonal thermal storage at the GWh level, while ensuring stable heat release temperature and minimal heat loss.