21results about How to "Diffusion coefficient is small" patented technology

The invention discloses an anti-hydrogen-permeation composite coating for a hydrogen conveying pipeline and a preparation method of the anti-hydrogen-permeation composite coating, and belongs to the field of physically modified metal corrosion prevention. The method comprises the following steps: step 1, firstly weighing quantitative silicon carbide powder, silicon carbide fiber and modified silicon carbide powder, adding a dispersing agent for dispersing, and uniformly stirring under the action of magnetic stirring; step 2, adding quantitative organic resin and a curing agent thereof in the step 1, further stirring uniformly, defoaming under a vacuum condition, and removing bubbles and a dispersing agent therein; and thirdly, the steel plate is pretreated, then the steel plate is evenly coated with the coating, and the stable coating can be obtained through normal-temperature curing and heating curing. The preparation method of the coating is easy to operate, low in cost and high in hydrogen permeability resistance, the service life of the hydrogen conveying pipeline can be effectively prolonged, and the hydrogen conveying efficiency and the pipeline safety are improved.

The invention discloses a thermal barrier coating resistant to high-temperature oxidation and a preparation method thereof, and relates to the technical field of thermal barrier coating materials. According to the preparation method, a NiCoCrAlYHfRu coated coating is prepared on a high-temperature alloy by adopting arc ion plating equipment, and a YSZ / LaZrCeO ceramic surface layer is prepared by adopting electron beam physical vapor deposition equipment. The thermal barrier coating prepared through the technology has a unique columnar crystal structure and meanwhile has good thermal cycle performance. Finally, the anti-oxidation and anti-corrosion requirements of the turbine blade can be met; and the process is simple, industrial production is easy to achieve, and the composite coating is excellent in performance, has application prospects and is suitable for the high-temperature alloy.

The application relates to the technical field of zirconium-niobium alloy material processing, in particular to a preparation method of a large-diameter zirconium-niobium alloy pipe for nuclear industry, which comprises the following steps: S1, mixing nuclear-grade sponge zirconium and niobium scraps, or mixing zirconium-niobium alloy, zirconium dioxide and iron; melting the mixture and preparing a zirconium-niobium alloy ingot; S2, sequentially performing large deformation forging in a beta single-phase zone and an alpha+beta two-phase zone; S3, drilling a central hole in the axial direction of a round-forging blank; quenching in the beta single-phase zone; S4, coating an anti-galling agent on the surface of the central hole and heating to prepare a pipe blank in the mode of cross piercing; S5, performing periodic forging and rolling on the pipe blank; S6, annealing the hot-rolled pipe twice; and straightening the hot-rolled pipe after the second-stage annealing. The zirconium-niobium alloy pipe has uniform microstructure, good mechanical properties and corrosion resistance, the production direction of the brittle hydride is nearly parallel to the circumferential direction of the pipe, and brittle damage of the pipe wall thickness caused by the crack propagation of the hydride is avoided.

The invention discloses a lithium iron manganese phosphate composite material and a preparation method and application thereof, belonging to the technical field of lithium batteries. The composite material comprises the following raw materials: a lithium source, a manganese source, an iron source, phytic acid, graphene oxide, polyvinyl alcohol, pyrrole and a dopant. The invention adopts a hydrothermal method to make hydroxyl groups on the surface of graphene oxide react with phytic acid to obtain a mixed solution a, and similarly obtains a mixed solution b containing polyvinyl alcohol phytate, combines a manganese source, a lithium source and an iron source, prepares a semi-finished product by roasting, and then coats a doped polypyrrole layer on the surface of the semi-finished product to finally obtain a lithium iron manganese phosphate composite material with a three-dimensional structure. The three-dimensional structure is a composite structure of a rod-like structure and a sheet structure. Compared with the lithium iron manganese phosphate material with a single morphology in the prior art, the specific surface area is significantly improved, the stability is stronger, the contact area with the electrolyte is larger, and the diffusion efficiency of lithium ions and the charge and discharge performance of the battery are improved.

The invention discloses a bottom gas material and preparation and application thereof, and relates to the field of gas storage. The bottom gas material comprises a gas-repellent nano material, a surfactant and carbon dioxide. The bottom gas material has the beneficial effects of density regulation and improvement, remarkable diffusion inhibition, excellent dynamic adaptability and the like, and can solve the problems of easiness in molecular diffusion, low density gradient, poor dynamic stability and the like of an existing bottom gas material of a gas storage.

The application provides a phosphogypsum-based light high-strength steel pipe concrete and a preparation method thereof, and relates to the technical field of the steel pipe concrete.The steel pipe concrete comprises the following raw materials in parts by weight: 450-500 parts of a hydraulic cementitious material, 255-272 parts of phosphogypsum light aggregate, 480-610 parts of gravel with a particle size of 4.75-19.0 mm, 708-743 parts of medium-coarse sand, 3.24-5.85 parts of a water reducing agent and 150-156 parts of water; the hydraulic cementitious material is a gypsum-slag cement containing modified phosphogypsum.The application realizes the lightness, controllable micro-expansion property and good corrosion resistance of the steel pipe concrete on the basis of ensuring the strength of the steel pipe concrete, and controls the manufacturing cost of the steel pipe concrete.

The invention discloses an Al-Mg-Sc-Zr series aluminum-based composite powder and a preparation method and application thereof. The Al-Mg-Sc-Zr series aluminum-based composite powder consists of an Al-Mg-Sc-Zr series aluminum alloy powder, a Co-Cr-Ni medium-entropy alloy powder and an oxide bait powder; in the Co-Cr-Ni medium-entropy alloy powder, Co, Cr and Ni are in an equal molar ratio; in the Al-Mg-Sc-Zr series aluminum alloy powder, each component and its weight percentage are as follows: 1.0-5.0% of Mg, 0.3-1.0% of Sc, 0.05-0.35% of Zr, 0.05-0.5% of Mn, 0.1-0.2% of Si, 0.01-0.03% of Mo, and the rest is Al. The Al‑Mg‑Sc‑Zr aluminum-based composite material obtained by laser additive forming of the Al‑Mg‑Sc‑Zr aluminum-based composite powder of the present invention not only has high room temperature tensile strength, but also has good high temperature resistance. The tensile strength at 300°C can still reach more than 200 MPa, meeting the current performance requirements of aerospace heat-resistant aluminum alloy components.

This invention discloses a preparation process for paper boxes used for food preservation and the resulting food preservation paper box, belonging to the field of packaging product technology. This invention constructs a dynamic covalent bond gradient interface and forms a strong anchoring-weak cohesive gradient structure by regulating the binding energy between fibers and functional layers, achieving a low fiber damage rate after multiple paper box cycles. A functional adaptation layer is simultaneously applied at the outlet of the paper machine's drying section, utilizing the water layer adsorbed on the fiber surface to achieve synergistic anchoring of interpenetrating network physical entanglement and chemical grafting. The core paper is micro-injected using hot press rollers, with molten chitosan-PEG graft material encapsulating softened PLA particles at 130°C, rapidly forming a mechanical interlocking structure within 2 seconds. Multi-scale synergistic slow release is achieved through spatial separation of modular slow-release tablets and electrostatically flocked citric acid. When humidity is triggered, water acts as a proton conductor at the interface, avoiding pre-reaction. Diatomaceous earth channels adsorb some NaClO2, forming a secondary release reservoir and extending the peak release time.

The application discloses active powder concrete and a preparation method and application thereof, relates to the technical field of concrete materials and marine engineering durability, and realizes the synergistic promotion of crack self-repairing efficiency, chloride ion solidification capacity and fiber-matrix interface bonding performance. The application solves the problems of long-term self-repairing failure caused by premature consumption of repair components in traditional self-repairing technology, the chloride ion solidification efficiency far lower than the theoretical value caused by uneven dispersion and weak interface bonding in traditional ion capturing means, and the problems of accelerated matrix damage caused by poor interface bonding and missing passivation protection of traditional steel fibers.

The application discloses a preparation method of a high-strength and high-conductivity copper alloy wire rod, which adopts gradient extrusion, extrusion under high-temperature conditions to obtain a copper rod with uniform and small equiaxed crystal structure; large deformation extrusion under medium and low temperature conditions to obtain a copper rod with streamline fiber structure; and multi-pass drawing treatment to obtain a copper alloy wire rod with elongated fiber structure along the radial direction of the wire rod. The copper alloy wire rod has high tensile strength and high conductivity, and solves the contradiction that the copper alloy wire rod cannot simultaneously meet high strength and high conductivity in the prior art.

The application belongs to the technical field of cord steel preparation, and particularly relates to a high-strength and high-plasticity cord steel and a preparation method thereof, the preparation method comprising the following steps: S1, obtaining a cord steel casting blank, heating, rolling and cooling the cord steel casting blank to obtain a cord steel wire rod, and the structure of the cord steel wire rod is a pearlite structure with an average interlamellar spacing of 95-100 nm; S2, cold drawing the cord steel wire rod to obtain a cord steel wire material, and the total surface reduction of the cold drawing is greater than or equal to 85%; and S3, heat treating the cord steel wire material to obtain the high-strength and high-plasticity cord steel, and the holding temperature of the heat treatment is 280-300 DEG C. According to the application, a pearlite matrix is obtained through alloy composition and cooling design, and severe plastic deformation is performed to construct an initial state with high defect density, low-temperature heat treatment is adopted to drive short-range diffusion of interface carbon atoms to construct a composition gradient and drive diffusion of micro-alloy elements to regulate nanometer precipitates, and the interface plasticization and precipitation reinforcement are synergized.

The invention discloses a high-strength heat-resistant aluminum alloy conductor which comprises the following components in percentage by mass: less than or equal to 0.15% of Fe, less than or equal to 0.15% of Si, 0.03-0.2% of Mo, 0.03-0.2% of Ta, 0.03-0.2% of Nb, 0.03-0.2% of Yb, 0.03-0.2% of Dy, 0.001-0.008% of B, less than or equal to 0.03% of other inevitable single impurity elements, less than or equal to 0.003% of the total amount of Mn, Cr and V, less than or equal to 0.15% of the total amount of the impurity elements and the balance of aluminum. The high-strength heat-resistant aluminum alloy conductor has high conductivity and excellent high-temperature mechanical properties, the tensile strength at the room temperature is larger than or equal to 160 MPa, the elongation at break is larger than or equal to 16%, the conductivity at the temperature of 20 DEG C is larger than or equal to 62% IACS, and the high-strength heat-resistant aluminum alloy conductor has high compressive creep resistance.

The invention belongs to the technical field of electric power engineering, and particularly relates to a composite layer material for a cable intermediate joint and a preparation method of the composite layer material. The composite layer material for the cable intermediate joint is composed of an inner semi-conductive layer, an insulating layer and an outer semi-conductive layer, the silicone rubber is prepared from the following raw materials: methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, trifluoropropyl methyl vinyl silicone rubber, a vulcanizing agent, an assistant crosslinker, an accelerant, diphenyl silanediol, an anti-aging agent, trifluoropropyl cage type silsesquioxane, and a mixture of modified nano hydroxyapatite and nano hectorite. According to the composite layer material for the cable intermediate joint, the three layers adopt the consistent siloxane main chain structure and vulcanization system, interlayer chemical compatibility is ensured, synchronous co-crosslinking is achieved, and by adjusting the silicone rubber composition and proportion of all the layers, the composite layer material can be applied to the cable intermediate joint. And it is ensured that the prepared composite layer material for the cable intermediate joint has excellent mechanical and hydrophobic water-blocking performance.

The invention provides a dimer acceptor material based on an electron-withdrawing bridging unit as well as a preparation method and application of the dimer acceptor material. The structural general formula of the dimer type acceptor material is (I), and the dimer type acceptor material is constructed by taking a benzotriazole unit with electron-withdrawing capability as a central core and taking a planar rigid unit with electron-withdrawing capability as a bridging unit. The acceptor material has a relatively high glass transition temperature and a relatively low diffusion coefficient. The material is used in a photoelectric functional device, can stabilize the film morphology of an active layer, and finally can effectively improve the stability of the device, for example, as an active layer acceptor material of an organic solar cell, can promote commercial application of the organic solar cell.

The application belongs to the technical field of electric power engineering, and particularly relates to a composite layer material for cable intermediate joint and a preparation method thereof. The composite layer material for cable intermediate joint is composed of an inner semi-conductive layer, an insulating layer and an outer semi-conductive layer. The insulating layer is composed of the following raw materials: methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, trifluoro propyl methyl vinyl silicone rubber, vulcanizing agent, auxiliary cross-linking agent, accelerator, diphenyl silicone diol, anti-aging agent, trifluoro propyl cage type silsesquioxane, and a mixture of modified nano-hydroxyapatite and nano-laponite. The composite layer material for cable intermediate joint has a consistent siloxane main chain structure and vulcanization system in three layers, which ensures the chemical compatibility between layers and realizes synchronous co-crosslinking. By adjusting the composition and ratio of silicone rubber in each layer, the prepared composite layer material for cable intermediate joint has excellent mechanical and hydrophobic water-blocking properties.

The invention relates to a semi-solid alloying method for preparing a metal alloy material. The method comprises the following steps: firstly, obtaining a solid-liquid coexistence temperature interval suitable for treatment based on a phase diagram and thermodynamics calculation; then selecting metal raw materials forming the target component, and assembling the metal raw materials into an original blank with a close contact interface; and in the semi-solid temperature interval, a heat-force coupling process is adopted, a solid-liquid coexisting semi-solid structure is formed through local liquefaction induced by diffusion / mass transfer, and macroscopic flow mixing and microstructure reconstruction of the material are enhanced under the shear deformation or stirring effect, so that uniform alloying and structure refinement of the target alloy material are achieved. Compared with the prior art, the method has the advantages that uniform alloying and structure refinement of the alloy material can be realized under the condition that the traditional multi-step series connection of smelting, casting, heat treatment, deformation processing and the like is not needed, the alloy material with uniform components, fine matrix structure and uniformly distributed second phase is obtained, the process flow is simplified, and the energy consumption is low.

The invention relates to the technical field of concrete admixtures, and discloses a polycarboxylate superplasticizer containing a nano material and a preparation method of the polycarboxylate superplasticizer. The preparation method comprises the following steps: adding a solution A, alkenyl modified silane chitosan, water, ammonium chloride and ferrous sulfate into a reactor; adding a sodium persulfate initiator solution E, a mercaptoethanol reducing agent solution C and a mercaptoacetic acid chain transfer agent solution D under a stirring condition to initiate a polymerization reaction, and then dropwise adding the solution B; after dropwise adding is completed, a reaction is conducted, a product is cooled to the room temperature, then the pH value is adjusted to be neutral with alkali liquor, and the polycarboxylate superplasticizer containing the nano material is obtained. Chitosan in alkenyl modified silane chitosan can reduce the diffusion coefficient of chloride ions, improve the impermeability and compactness of the concrete, and improve the durability of the concrete at the same time. And the siloxane group also improves the durability of the concrete.

The present application relates to a kind of perovskite precursor solution stability protection method, belong to perovskite photovoltaic technical field, solve the problem that perovskite precursor solution is easily affected by light, oxygen and water vapor and occurs degradation deterioration in the process of opening bottle use.The method of the present application is: perovskite precursor solution is stored in liquid storage container, perovskite precursor solution surface is covered with a layer of liquid protective layer formed by liquid protective agent;The absorbance A of liquid protective layer in 300~550 nm wave band is greater than or equal to 3.The present application forms threefold protection of light shielding, oxygen isolation and water vapor barrier through liquid protective layer, can continuously provide interface protection in the process of opening bottle and static storage, effectively improve the stability of perovskite precursor solution.

The application provides a high-entropy copper core ball and a preparation method thereof. The preparation method of the high-entropy copper core ball comprises the following steps: S10, electroplating nickel metal on the outer surface of the copper core ball to obtain a first intermediate; S20, performing vacuum hot-dip roll plating treatment on the high-entropy alloy and the first intermediate, and performing inductive uniform heating at a temperature lower than the melting point of the first intermediate to obtain a second intermediate; S30, screening the second intermediate through a screen to obtain high-entropy copper core balls that have been plated, and cooling to obtain a third intermediate; S40, performing fine grinding treatment on the third intermediate to obtain a fourth intermediate; S50, performing screening treatment on the fourth intermediate to obtain the high-entropy copper core ball; and the high-entropy copper core ball is at least coated with the high-entropy alloy. The preparation method of the high-entropy copper core ball realizes the preparation of a high-entropy alloy precise coating, improves the interconnection reliability of the copper core ball product, and reduces the defects of the interconnection welding points of the copper core ball product.

This invention relates to a self-healing steel slag-based solid waste cementitious material based on microbial mineralization and its preparation method, belonging to the field of building materials technology. The material, by mass parts, comprises: 100-150 parts steel slag powder, 50-100 parts blast furnace slag powder, 8-23 parts alkaline activator, 10-20 parts porous steel slag carrier loaded with urea-decomposing bacteria, 200-300 parts aggregate, and 50-70 parts mixing water. The porous steel slag carrier has a porosity of 35%-50% and an average pore size of 10-50 μm, effectively isolating the highly alkaline environment inside the cementitious material from microbial damage. When cracks appear in the material, the invading water activates dormant microorganisms within the carrier, inducing the formation of calcium carbonate precipitate to automatically fill the cracks. This invention not only achieves the resource utilization of industrial solid waste such as steel slag but also possesses continuous self-healing capabilities, with a strength recovery rate of over 90% after 28 days, a significantly reduced chloride ion diffusion coefficient, and significantly improved durability.

This invention relates to the field of cement-based building materials technology, and in particular to a cement-based underwater non-dispersible repair material and its preparation method. By using modified cement, modified fly ash and self-made organic reinforced emulsion as the main raw materials, and in combination with nano-silica, thickener, water-reducing agent and defoamer, a cement-based underwater non-dispersible repair material that can remain stable in the underwater environment and has excellent bonding and mechanical properties is prepared.