25 results about "Al2o3 nanoparticles" patented technology

The invention belongs to the field of material surface treatment, and relates to a glass explosion-proof rubber coating process. According to the process, alpha-Al2O3 nanoparticles and fatty acid grafted modified nano SiO2 are prepared, a nano composite adhesive containing aramid fibers and nickel hydroxyl iron powder is prepared in combination with a three-stage dispersion process (mechanical shearing, ultrasonic cavitation and rolling grinding), and a glass surface nano rough interface is constructed in combination with plasma treatment and a PECVD (Plasma Enhanced Chemical Vapor Deposition) technology. A magnetoelectric synergistic coating (magnetic field orientation + vacuum infiltration + gradient pressure + electrostatic overlock) and electromagnetic curing-gradient cooling process is adopted to realize uniform coating and rapid crosslinking of an adhesive layer. Through cooperation of material modification and a multi-field coupling process, the impact energy absorption of an adhesive layer is greater than or equal to 80%, the interface bonding strength reaches 22MPa, the curing time is shortened by 50%, degumming is avoided in an extreme environment, and the thickness deviation of the adhesive layer is + / -5 [mu] m. By adopting natural raw materials and a low-VOC formula, the anti-explosion glass is suitable for scenes such as building curtain walls and automobile glass, the anti-explosion performance is improved, and the service life is prolonged.

The invention discloses a dynamic self-repairing PI-based nano protective coating for a crease-free folding screen. The dynamic self-repairing PI-based nano protective coating is prepared from a polyimide matrix, a dynamic cross-linking agent, self-repairing microcapsules, a surface-modified nano inorganic filler and a surface energy regulator, the polyimide matrix is obtained by polymerizing aromatic dianhydride and a diamine monomer containing a flexible chain segment, and the flexible chain segment comprises an ether bond or a methylene chain segment; the shell material of the self-repairing microcapsule is polyurea or polyurethane, and the core material of the self-repairing microcapsule is a polyimide repairing agent; the surface modified nano inorganic filler is SiO2 or Al2O3 nano particles subjected to surface grafting modification by a silane coupling agent. The preparation method has the beneficial effects that the coating prepared by the preparation method simultaneously realizes the basic performances of high hardness, high toughness, high light transmittance and strong adhesion, has the efficient grading self-repairing capability aiming at damages of different scales, and finally passes more than one hundred thousand times of extreme bending fatigue tests; the problems of balance of multi-performance requirements, single repair mechanism and low efficiency in the prior art are solved.

The invention relates to a preparation method of a Cu-Al-Mn-based elastic thermal refrigeration material. The preparation method mainly comprises the following steps: (1) uniformly mixing Cu-Al-Mn-based alloy powder and Al2O3 powder to obtain mixed powder; (2) sintering the mixed powder into blocks; (3) carrying out heat treatment on the sintered block; wherein the Cu-Al-Mn based alloy powder and the Al2O3 powder are spherical particles, and the Cu-Al-Mn based alloy powder and the Al2O3 The particle diameter of the Cu-Al-Mn based alloy powder is 10 to 100 [mu] m; the particle diameter of the Al2O3 powder ranges from 20 nm to 500 nm. According to the method, Al2O3 nano-particles with high mechanical strength and Cu-Al-Mn spherical powder are mixed and sintered to obtain a microstructure with Cu-Al-Mn particles wrapped by Al2O3-rich particles, the mechanical property of the material is improved, and meanwhile the excellent elastic heat effect is achieved.

The present invention provides a method for preparing spherical α-Al2O3 nanoparticles, comprising the following steps: adding malic acid to an alcohol aluminum compound in a polar organic solvent, and drying to obtain an anhydrous aluminum gel; wherein the molar ratio of [AlO6] octahedron to [AlO4] tetrahedron in the anhydrous aluminum gel is 5.8-6:4-4.2; and calcining the anhydrous aluminum gel at 760-900°C to directly transform the γ-Al2O3 nanoparticles produced during the calcination into α-Al2O3 nanoparticles. The present invention aims to address the problem of abnormal grain growth that occurs during high-temperature calcination of α-Al2O3 nanoparticles by providing a method for preparing α-Al2O3 nanoparticles at low temperatures using an anhydrous sol-gel method, and to achieve effective regulation of grain morphology in the method.

This invention discloses a method for refining primary silicon in Al-Si alloys through synergistic modification with nano-ceramics based on laser additive manufacturing. The method involves uniformly mixing Al-Si alloy powder with TiB2 and Al2O3 nano-ceramics using a ball mill under inert gas protection to obtain a ceramic-reinforced nano-Al-Si alloy composite powder. This nano-ceramic-modified Al-Si alloy powder is then melted and solidified layer by layer using a laser powder bed melting and forming equipment to create the desired target part. In this method, during the solidification of the nano-ceramic-reinforced Al-Si alloy melt, Al2O3 nanoparticles, due to their similarity to the Si crystal structure and the existence of a good interfacial coherence relationship, act as heterogeneous nucleation sites for primary silicon, increasing the nucleation rate and refining the size of primary silicon. TiB2 nanoparticles, distributed at the solid-liquid interface, can to a certain extent prevent the diffusion and aggregation of Si atoms into Si-Si atom clusters, thereby inhibiting the growth of the primary silicon phase, promoting the regularization of the primary silicon morphology and refining its size, and effectively reducing matrix grain size, significantly improving the mechanical properties of the Al-Si alloy.

The invention relates to the field of solid-state electrolytes, in particular to a sintering aid for a solid-state electrolyte and the solid-state electrolyte containing the sintering aid. The solid electrolyte is an LLTO solid electrolyte, and the sintering aid comprises the following components: a Li4Ti5O12 nano material, modified or unmodified Al2O3 nano particles and at least one fluoride; moreover, based on the total mass of the sintering aid, the mass percentage contents of the Li4Ti5O12 nano material, the modified Al2O3 nano particles and the fluoride are respectively selected from 60%-65%, 30%-35% and 5%-10%. The ionic conductivity of the LLTO solid electrolyte prepared by the sintering aid provided by the invention is remarkably improved.

This application relates to the field of fuel cells and discloses a proton exchange membrane modified with dual inorganic fillers, comprising a Nafion composite membrane matrix; CeO2 anchored on amine-functionalized cellulose nanofibers (CNFs), wherein CeO2 accounts for 2% to 5% of the total mass of the composite membrane; SiO2 nanoparticles are added, wherein SiO2 nanoparticles account for 0.5% to 2% of the total mass of the composite membrane; and Al2O3 nanoparticles are added, wherein Al2O3 nanoparticles account for 0.5% to 2% of the total mass of the composite membrane. This invention significantly improves the hardness and compressive strength of the composite membrane by anchoring CeO2 on amine-functionalized cellulose nanofibers (CNFs) and adding SiO2 and Al2O3 nanoparticles, thereby improving its service life and reliability. Simultaneously, the addition of carbon nanotubes (CNTs) greatly enhances the electrical conductivity of the composite membrane, which is crucial for improving the output efficiency and response speed of the fuel cell, directly affecting the overall energy conversion efficiency of the battery.

This invention discloses the application of arc-fed wire feeding technology in the preparation of aero-engine turbine disk materials, belonging to the field of aero-engine turbine disk manufacturing technology. It involves using GH4169 high-temperature alloy as the base wire, electroplating TiC nanoparticles and Al2O3 nanoparticles to form a coating layer, producing a composite wire. An ultrasonic-assisted arc-fed wire feeding additive manufacturing process is then performed, with the ultrasonic action area covering the molten pool along the liquid / solid two-phase region. When the deposition layer temperature drops to a set temperature, alternating vertical and horizontal forging is performed in a multi-directional micro-forging process. Finally, heat treatment is conducted to obtain the aero-engine turbine disk material. This invention successfully solves the technical problems of coarse microstructure, numerous defects, and unstable performance in traditional additive manufacturing of aero-engine turbine disk materials through the synergistic effect of ultrasonic-assisted arc-fed wire feeding additive manufacturing, nanoparticle composite reinforcement, and synchronous multi-directional micro-forging.

The invention belongs to the technical field of diamond copper composite materials, and particularly relates to a preparation method of a high-strength and high-thermal-conductivity copper-based composite material and the high-strength and high-thermal-conductivity copper-based composite material. The preparation method of the high-strength and high-thermal-conductivity copper-based composite material comprises the following steps that (1) diamond particles and copper-aluminum alloy powder are mixed and then subjected to heat treatment in an inert atmosphere, and diamond-copper mixed powder is obtained; and 2) mixing the diamond-copper mixed powder obtained in the step 1) with an oxygen source, performing compression molding, and performing internal oxidation reduction sintering. Aluminum carbide and Cu-Al-C are generated on the surface of diamond in situ through interface reaction to improve the interface bonding strength of the diamond and a copper matrix, Al2O3 nanoparticles are generated in situ through internal oxidation-reduction-sintering, the interface bonding capacity and the heat conduction performance are further improved, and then preparation of the high-strength and high-heat-conduction copper-based composite material is achieved.

The invention discloses a mechanoluminescence optical fiber and a preparation method and application thereof, and belongs to the field of rare earth. The mechanoluminescence optical fiber comprises a polydimethylsiloxane condensate, and core fluorescent powder, Al2O3 nanoparticles and long afterglow fluorescent powder which are uniformly distributed in the polydimethylsiloxane condensate, the core fluorescent powder is ZnS fluorescent powder doped with Cu < 2 + >; and the long-afterglow fluorescent powder is SrAl2O4 fluorescent powder doped with Eu < 2 + > and Dy < 2 + >. According to the mechanoluminescence optical fiber disclosed by the invention, through the synergistic effect of the added specific long-afterglow fluorescent powder and the core fluorescent powder, the mechanoluminescence optical fiber has excellent luminous intensity and long-afterglow performance.

The invention discloses a method for improving the bending strength of flexible glass, and relates to the technical field of flexible glass surface defect control. The method comprises the following steps: depositing based on a magnetron sputtering technology to form nano-particle distribution which is gradually changed from bottom to top; stress is dispersed through gradually changing material properties, and the bending strength of the flexible glass is improved. The coating is deposited through the magnetron sputtering technology, and nano-particle distribution gradually changing from bottom to top is formed, so that stress during bending is dispersed, and microcracks are reduced. Meanwhile, a low-temperature annealing process is combined, so that the residual stress is further reduced. The Al2O3 nanoparticles are used to form gradient distribution in the coating, the bottom is tightly combined with the glass substrate, and the top provides hardness, so that the generation of cracks is reduced. The bending strength of the flexible glass is effectively improved, and a feasible and simple operation method is provided for application and development of the flexible glass.

The invention discloses an alpha-Al2O3 nano-particle high-precision particle size grading method based on a four-layer non-equidistant density gradient solution and a collaborative sedimentation mechanism, which comprises the following steps: S1, carrying out surface dispersion treatment on alpha-Al2O3 nano-particles to form a uniform particle suspension with the mass fraction of 0.1-0.2 wt%; and S2, constructing four layers of non-equidistant density gradient liquid: sequentially and slowly injecting solvents with different densities into the centrifugal tube from bottom to top. According to the method, a four-layer non-equidistant density gradient liquid system is constructed, and a multi-stage differential sedimentation interface is formed in the centrifugation process, so that alpha-Al2O3 nanoparticles in different particle size sections obtain a relatively clear migration path, the mixing crossing probability of particles with approximate particle sizes at the interface is reduced, and the definition of a hierarchical structure is improved.

The invention relates to the technical field of lithium battery immersed coolants, in particular to a lithium battery immersed coolant containing surface modified aluminum oxide nanoparticles. The coolant comprises the following components in percentage by mass: 60%-90% of a pentaerythritol ester matrix, 0.5%-5% of surface modified Al2O3 nanoparticles, 0.1%-1% of a silane coupling agent modifier, 0.1%-0.5% of an auxiliary stabilizer and 3.5%-39.3% of absolute ethyl alcohol.

The application discloses a synthesis method for simultaneously regulating size and morphology of gamma-Al2O3 nano materials, and mainly relates to micro-morphology transformation of gamma-Al2O3 nanoparticles from nanorods to nanosheets by changing solution pH value. The method uses aluminum nitrate nonahydrate as an aluminum source, benzene sulfonic acid as a surfactant, adjusts the pH value of the solution through ammonia water, and adopts a hydrothermal method to synthesize gamma-AlOOH nanorods and nanosheets; then, gamma-Al2O3 nanorods and nanosheets are obtained by high-temperature calcination. The prepared gamma-Al2O3 nano materials have excellent catalytic performance in an ethanol dehydration reaction, and show obvious morphology effect.

The invention discloses a preparation method of a textile with a passive radiation cooling function, and a composite fiber membrane with a radiation cooling effect is prepared by utilizing an absolute methanol solution of PA6 and a DMF (Dimethyl Formamide) solution containing TPU (Thermoplastic Polyurethane) and Al2O3 through an electrostatic spinning technology. The fiber membrane is composed of a TPU / Al2O3 layer and a PA6 layer, scattering of sunlight in the fiber layer is enhanced through the micro-nano-level fiber scale, Al2O3 nanoparticles are evenly dispersed in TPU fibers, the reflectivity of the composite fiber membrane to ultraviolet-visible light is enhanced, the effect of protecting the human skin is achieved, functional groups in TPU can enhance infrared radiation of an atmospheric transparent window, and the functional groups in TPU can enhance the infrared radiation of the atmospheric transparent window. And the temperature is reduced. PA6 is used as an infrared transparent material, infrared radiation of human skin can be enhanced, and the radiation refrigeration effect of the composite fiber membrane is further enhanced.

The invention discloses an intelligent cable bridge with an active heat dissipation function, and the cable bridge comprises a cable trough frame, a plurality of cooling pipes are fixedly arranged on the inner wall of the bottom of the cable trough frame, the interior of each cooling pipe is filled with a phase-change material, the phase-change materials are acetone and Al2O3 nanoparticles, the side surface of the cable trough frame is provided with rectangular air inlets, and the rectangular air inlets are communicated with the cooling pipes. Two sliding rails are fixedly installed on the side wall of the cable groove frame and located on the two sides of the rectangular air inlet hole. The conical heat conduction groove collects cable heat to drive the piezoelectric film to generate power, electric energy is stored and then supplies power to the semiconductor cooler, the cooling fan and the electromagnet, and zero external energy heat dissipation is achieved. The acetone and Al2O3 nano-particle composite phase change material improves the heat capacity and the response speed, and cross overheating is avoided in combination with the spaced cable trough. The electromagnet linkage baffle automatically opens and closes the air inlet hole along with the temperature, gravity reset sealing is achieved, semiconductor refrigeration waste heat is returned to the power generation end, and the energy efficiency is improved.

The invention discloses a morphology response difference-based alpha-Al2O3 nanoparticle differential centrifugal separation method, which comprises the following steps: S1, dispersing alpha-Al2O3 nanoparticles in absolute ethyl alcohol at a concentration of 0.55 wt%, and continuously dispersing the particles by using an ultrasonic device; s2, carrying out high-speed centrifugation on the obtained suspension liquid under the condition of 10000-15000 rpm, discarding lower-layer precipitates, and reserving supernate; s3, performing ultrasonic dispersion on the supernate again under the same condition as that in the step S1; s4, carrying out medium-speed centrifugation on the dispersed system at a speed of 4000-7000 rpm, and collecting the lower layer precipitate; and S5, repeating the combined process of the steps S2-S4 for 2-3 rounds, combining all precipitates obtained in the medium-speed centrifugation stage, and drying to obtain the target alpha-Al2O3 nanoparticles. The particles obtained by the method show higher polishing rate and lower surface roughness and defect density in CMP (Chemical Mechanical Polishing), and the density and grain uniformity are improved in ceramic sintering; meanwhile, the method is clear in process, adjustable in parameter and high in equipment universality, and has remarkable industrial amplification and engineering application potential.

The invention relates to a method for improving the stability of a perovskite solar cell, and belongs to the technical field of perovskite solar cell preparation, and the internal structure of the perovskite solar cell comprises a substrate, a conductive layer, a hole transport layer, a perovskite absorption layer, an electron transport layer and a back electrode layer from bottom to top. An interface layer is further arranged between the hole transport layer and the perovskite layer, a nano-particle layer is further arranged between the hole transport layer and the interface layer, and the method comprises the following steps: firstly preparing the nano-particle layer on the hole transport layer, and then preparing the interface layer on the nano-particle layer; wherein the preparation material of the hole transport layer is NiOx, and the preparation material of the nanoparticle layer is any one of Al2O3 nanoparticles, SnO2 nanoparticles, SiO2 nanoparticles and MgO nanoparticles. According to the perovskite solar cell, the nanoparticle layer is arranged between the hole transport layer and the interface layer, so that the binding force between the interface layer and the hole transport layer is improved, and the stability of the perovskite solar cell is improved.

This invention discloses a differential centrifugation method for separating α-Al₂O₃ nanoparticles based on morphological response differences, comprising the following steps: S1: Dispersing α-Al₂O₃ nanoparticles at a concentration of 0.55 wt% in anhydrous ethanol, and continuously dispersing the particles using an ultrasonic device; S2: Centrifuging the resulting suspension at 10,000–15,000 rpm, discarding the lower precipitate, and retaining the supernatant; S3: Dispersing the supernatant again using ultrasonication under the same conditions as in step S1; S4: Centrifuging the dispersed system at 4,000–7,000 rpm at a medium speed, and collecting the lower precipitate; S5: Repeating the combined process of steps S2–S4 2–3 times, merging all precipitates obtained in the medium-speed centrifugation stage, and obtaining the target α-Al₂O₃ nanoparticles after drying. The particles obtained by this method exhibit higher polishing rates, lower surface roughness, and lower defect density in CMP, which improves density and grain uniformity in ceramic sintering. At the same time, the method has a clear process, adjustable parameters, and strong equipment versatility, and has significant potential for industrial scale-up and engineering applications.

A low-cost energy storage multilayer ceramic capacitor, its ceramic dielectric material, and preparation method are disclosed. The composition and percentage content of the ceramic dielectric material are as follows: [awt%(Sr 1‑x Ca x (Ti) 1‑y Zr y [)O3+bwt%(10SiO2-Al2O3-zH3BO3)], the main substrate is (Sr 1‑ x Ca x (Ti) 1‑y Zr y The sintering aid is SiO2-Al2O3-H3BO3, where 90 < a < 98, 2 < b < 10, and 0.5 < z < 1.5. During preparation, Si and B-doped mesoporous Al2O3 nanoparticles are synthesized using an ultrasonic-assisted sol-gel method as sintering aids and distributed on the surface of the main substrate by ultrasound. This effectively restricts the growth of the main substrate grains, resulting in ceramic dielectric powder with controllable grain size and uniform distribution. This ceramic powder can be matched with base metal electrodes, and at the same time, it improves the bias characteristics of capacitors while ensuring excellent electrical performance.

This invention discloses a high-boiling-point stable nano-heat exchange fluid and its preparation method. The heat exchange fluid uses a binary mixed base liquid composed of pure water and a polyol selected from ethylene glycol, 1,2-propanediol, and 1,2-butanediol. After adding a surfactant to the binary mixed base liquid, a nanoparticle system mainly composed of Al2O3 nanoparticles is introduced, followed by dispersion and homogenization treatment to obtain the stable nano-heat exchange fluid. The nanoparticle system may further include MWCNT nanoparticles and SiO2 nanoparticles to form composite nanoparticles, balancing enhanced thermal conductivity and dispersion stability. Compared with existing heat exchange working fluids, this invention improves the liquid-phase stable operating range, thermal conductivity, and adaptability to cyclic heat exchange by synergistically controlling the base liquid composition and the nanoparticle system. It is suitable for closed-loop high-temperature heat exchange, industrial waste heat recovery, and thermal management of electronic devices.

The invention relates to a polyimide composite gradient structure lithium battery diaphragm which is characterized by comprising a base layer, a middle layer and a surface layer which are sequentially arranged, the base layer is a polyimide nanofiber net, the diameter of polyimide nanofibers is 50-200nm, the porosity of the base layer is 70-85%, and the thickness of the base layer is 15-30mu m; the middle layer is a composite coating of a hydrophilic polymer and Al2O3 nano-particles, the surface of at least one side of the base layer is coated with the middle layer, the thickness of the middle layer ranges from 2 micrometers to 4 micrometers, the average particle size of the Al2O3 nano-particles ranges from 50 nm to 100 nm, and the Al2O3 nano-particles account for 30%-50% of the total mass of the middle layer; the surface layer is a porous layer containing SiO2 micron particles and covers the surface of the middle layer, the thickness of the surface layer is 3-6 microns, the average particle size of the SiO2 micron particles is 1-3 microns, the porosity of the surface layer is increased in a gradient mode from the side close to the middle layer to the outer side, and the gradient change rate is 10-15% / micron. According to the scheme, the lithium battery diaphragm with synergic improvement of temperature resistance, liquid absorption rate and ion conduction performance is realized.

The present invention discloses a WO3 / Al2O3 / graphite composite material, its preparation and application. In the composite material, WO3 nanoparticles and Al2O3 nanoparticles are tightly attached to graphite sheets. The gas-sensitive material has a large specific surface area and more gas interaction centers. Al2O3 nanoparticles account for 2-12% of the total mass of WO3 nanoparticles and Al2O3 nanoparticles. Through simple doping and stirring, it can be directly used as a gas-sensitive material. When it is used to detect 2-CEES gas, the optimal operating temperature of the gas sensor is 340°C. At an operating temperature of 340°C, the gas sensor has a response time of 5s to 2-CEES gas with a concentration of 5.70ppm, a recovery time of 42s, and a sensitivity of 69%.

The invention belongs to the technical field of semiconductor material preparation and new energy, and particularly discloses flexible water photovoltaic fabric based on MXene and Al2O3 and a preparation method of the flexible water photovoltaic fabric. The flexible water photovoltaic fabric based on MXene and Al2O3 comprises a flexible cotton cloth substrate, a flexible water photovoltaic fabric layer and a flexible water photovoltaic fabric layer, the functional coating is loaded on the surface of the cotton cloth fiber and in interwoven pores; the functional coating is of a graded composite structure containing Al2O3 nano particles and MXene nano sheets; wherein the Al2O3 nanoparticles are used as a water evaporation induced charge generation source; the MXene nanosheets are mutually lapped to form a three-dimensional conductive network, and the three-dimensional conductive network is used for rapidly extracting and conducting charges generated at the interface of the Al2O3 nanoparticles. The flexible water photovoltaic fabric prepared by the invention has excellent flexibility and better current output performance.

The invention relates to the technical field of electronic component surface treatment, in particular to a high-durability environment-friendly earphone charging terminal and an electroplating method thereof. The high-durability environment-friendly earphone charging terminal comprises a non-nickel bottom plating layer, a composite environment-friendly protective layer and a hydrophobic nano coating, carrying out electrolytic deposition on a copper-tin alloy plating solution to obtain a copper-tin alloy bottom plating layer, wherein the copper-tin alloy plating solution comprises potassium pyrophosphate, copper sulfate, stannous mono-sulphate and modified Al2O3 nanoparticles; a composite environment-friendly protective layer is obtained through pulse current deposition of an organic-inorganic hybrid plating solution, and the organic-inorganic hybrid plating solution comprises propylene glycol methyl ether acetate, EP-828, KH-550 and surface modified carbon nanotubes; a plasma etching micro-nano structure PTFE coating is introduced into the hydrophobic nano coating; the prepared high-durability environment-friendly earphone charging terminal realizes the integrated protection effects of biosafety, high wear resistance, corrosion resistance and super-hydrophobicity.