14results about How to "Dense microstructure" patented technology

The invention discloses a novel nano-coating cast steel brick and a preparation method thereof. The cast steel brick comprises a cylindrical refractory matrix, a double-layer nano coating and a modified metal reinforcing belt, wherein the double-layer nano coating comprises a nano aluminum oxide bottom layer and a functional layer containing a sol-gel pre-coated graphene-ceramic composite material. According to the preparation method, pulse vibration forming, a sol-gel pre-coating technology and a carbon thermal reduction protective atmosphere sintering technology are adopted, the graphene-ceramic composite material has an Al2O3-BN double-layer ceramic coating layer protection structure, and the structural stability of graphene at the high temperature is ensured. The technical problems of low refractoriness, poor corrosion resistance and short service life of a traditional cast steel brick are solved, the refractoriness is improved by about 6%, the corrosion resistance is improved by 78%, the thermal shock stability is improved by about 79%, the single use performance is improved by 250%, and the cast steel brick is suitable for molten steel flow control in a continuous steel casting process.

The invention provides a collaborative optimization method for a magnetic-thermal composite field assisted laser cladding process. According to the method, a magnetic-thermal composite field-assisted laser cladding device is designed based on an energy field-assisted laser cladding process principle and is used for improving the structure and performance of a coating; the method comprises the following steps: generating a quadratic polynomial regression model on the basis of an RSM method, magnetic-thermal composite field assisted laser cladding process parameters and nickel-based composite coating quality evaluation indexes, performing multi-target optimization on the coating quality evaluation indexes on the basis of the quadratic polynomial regression model and an IMOGWO algorithm, determining a magnetic-thermal composite field assisted laser cladding target process parameter combination, and determining the quality of the nickel-based composite coating. And score calculation is carried out on the target process parameter combination based on an EWM-TOPSIS method to obtain a comprehensive evaluation sequence of the target process parameter combination, so that collaborative optimization of the magnetic-thermal composite field assisted laser cladding process is realized, and the performance optimization efficiency and quality of the nickel-based composite coating are improved.

This invention discloses a method for preparing rare earth metals by electrolytic oxides using a fluoride system, belonging to the field of rare earth metal preparation technology. This invention modifies graphite anodes used in rare earth molten salt electrolysis. It improves oxidation and corrosion resistance, reduces anode wear, lowers replacement frequency, and increases production efficiency, yielding high-purity, low-carbon rare earth metal lanthanum. A three-dimensional network framework material is constructed using Prussian blue self-assembly and SiC is deposited to obtain a composite framework material. During pre-calcination with graphite and other materials, the derivatives optimize the crystal structure and interfacial bonding, enhancing the strength of the pre-shaped anode material and ensuring the integrity and performance stability of the electrode structure. Thirdly, the pre-shaped anode material is impregnated with a specific impregnation solution, altering the gas diffusion path and resistance, inhibiting oxidation reactions, and high-temperature sintering generates substances that fill the pores, forming a dense microstructure. Simultaneously, the compounds formed by phosphoric acid enhance cohesion and adhesion, improving oxidation and molten salt corrosion resistance, and extending the service life of the graphite anode.

The invention provides a tape casting method high-transparency polysulfonamide film as well as a preparation method and application thereof. The light transmittance of the high-transparency polysulfonamide film obtained through the tape casting method is larger than or equal to 80% (400-800 nm), and the dimensional change rate at 250 DEG C is smaller than or equal to 1%. The preparation method comprises the following steps: S1, pretreatment of the polysulfonamide fibers: soaking and purifying the polysulfonamide fibers in acetone; then stirring and alkalizing in an alkaline solution; removing the alkaline solution and drying to obtain pretreated polysulfonamide fibers; s2, preparation of a membrane casting solution: dissolving the pretreated polysulfonamide fiber in a solvent to prepare a polymer solution; then adding a salt cosolvent and a polymeric dispersant to prepare a mixed solution, and stirring, filtering and carrying out vacuum defoaming to obtain a membrane casting solution; s3, film forming through a tape casting method, wherein the film casting solution is placed on a substrate, and a wet film is prepared through scraper tape casting; s4, coagulating bath phase inversion: transferring the wet film into a coagulating bath, and coagulating to form a preliminarily shaped film material; and S5, post-treatment: washing the preliminarily shaped membrane material with water, and carrying out gradient drying to obtain the high-transparency polysulfonamide membrane.

The application discloses a gelatin-bacteriocin amino acid-dialdehyde starch composite film and a preparation method and application thereof. The preparation method of the composite film comprises the following steps: adding a crosslinking agent into a gelatin solution, adding N-hydroxysuccinimide into the gelatin solution after activation for a set time, then adding bacteriocin amino acid into the gelatin solution, coupling for a set time under weak acid condition and in the dark, and obtaining Gel-MAAs; dissolving the Gel-MAAs in water to obtain a composite solution; dissolving dialdehyde starch in water, gelatinizing, adjusting to weak alkalinity, and obtaining a dialdehyde starch solution; adding the dialdehyde starch solution into the composite solution, mixing uniformly, reacting at 35-45 DEG C for 1-3 h, adding glycerol with a mass fraction of 1-5%, ultrasonic degassing, pouring the film solution into a mold, and drying, and thus the composite film is obtained. The composite film has excellent mechanical properties, physicochemical properties, ultraviolet resistance, good biocompatibility, and great potential in the field of active composite films.

The application belongs to the technical field of anticorrosive coating and provides a silicon carbide modified waterborne alkyd resin anticorrosive coating and a preparation method thereof, a dense three-dimensional reinforcing network structure is constructed in the alkyd resin matrix by introducing silicon carbide particles and optimizing the synergic ratio of the silicon carbide particles, titanium dioxide and quartz powder fillers. The method effectively solves the problems of low hardness, poor medium resistance, uneven filler dispersion, weak interface bonding and difficulty in simultaneously improving mechanical and anticorrosive properties in the conventional physical filling modification due to low crosslinking density and many polar groups in the existing waterborne alkyd resin coating. The prepared coating has excellent comprehensive performance, the hardness can reach 2 H level, the gloss can reach 90%, the acid resistance, alkali resistance, salt water resistance and water resistance are significantly improved, and excellent electrochemical anticorrosive protection effect is exhibited on the metal matrix. The application is suitable for long-term anticorrosive protection of metal surfaces of steel structures, ships, bridges and the like, and has the characteristics of environmental protection and high performance.

The invention discloses a preparation method of a high-oil-phase solid plant-based fat analogue, which comprises the following steps: adding hydrophobic modified chitosan gel into a soybean protein isolate solution, then adding linseed oil and transglutaminase into the homogenized mixed solution, carrying out enzymatic crosslinking, and then putting into a calcium chloride solution for ionic crosslinking. According to the preparation method disclosed by the invention, a network structure is formed by carrying out enzyme induction on soybean protein isolate, and a double-network structure is formed by introducing hydrophobic modified chitosan microgel through ionic crosslinking and is used as a structural framework, so that the technical bottleneck that a stable three-dimensional network is difficult to form by traditional emulsion gel under a high-oil-phase condition is successfully broken through; the obtained fat analogue shows a highly compact and uniform microstructure, key texture parameters such as hardness, adhesion and chewiness of the fat analogue are remarkably improved along with structural optimization, high unification of high oil phase load and high-strength texture is realized, and solid taste and morphological stability of animal fat can be truly simulated.

The invention discloses a composite fiber reinforced high-molecular polymer-solid waste-based marine grouting material and a preparation method thereof. Solid wastes such as recycled concrete micro powder are used as main raw materials, high-molecular polymers and composite fibers are compounded, and the total solid waste mixing amount is 51%-75%. The preparation method comprises the steps of raw material pretreatment, dry powder mixing, fiber dispersion, polymer mixing, wet mixing and the like, uniform mixing of all the components can be guaranteed, and the fiber dispersity is excellent. The grouting material has high compression resistance and tensile strength and excellent freezing and thawing resistance and marine medium corrosion resistance, can effectively resist complex load and severe environment corrosion in ocean engineering and prolong the service life of a structure, is simple in preparation process, is suitable for industrial production, and can be widely applied to grouting connection of foundation structures of ocean engineering such as offshore wind power and the like.

This invention relates to polyimide composite pipes, their preparation methods, and applications. The polyimide composite pipe includes an inner layer and an outer layer disposed on the inner layer. The inner layer has a surface-modified layer in contact with the outer layer. The surface-modified layer is a modified polyimide modified with a diamine compound. The outer layer is a film layer of other polymer materials besides polyimide. This polyimide composite pipe ensures excellent adhesion between the material layers, avoiding delamination and other problems, while improving the mechanical properties of the composite pipe. Furthermore, the preparation method of this polyimide composite pipe is simple, low-cost, and suitable for large-scale production applications.

The invention relates to the field of ceramic materials, in particular to a preparation method of a high-thermal-conductivity aluminum nitride tape-casting green body and a ceramic chip thereof, and the high-thermal-conductivity aluminum nitride tape-casting green body is prepared from the following raw materials in parts by weight: 100 parts of aluminum nitride powder, 1.5-3.5 parts of a dispersing agent, 8-12 parts of a binder, 3-6 parts of a plasticizer, 1-5 parts of a sintering aid and 80-100 parts of water. According to the invention, due to the low hydrolytic property of the slurry, the uniform distribution of the sintering aid and the optimized sintering schedule, the thermal conductivity of the obtained ceramic wafer is stabilized at 200W / (m.K) or above, the ceramic wafer has a uniform and compact microstructure, the bending strength can reach 450MPa or above, and the requirement of high-end application on mechanical reliability is met.

This invention discloses an ultra-high strength high-performance concrete and its preparation method, belonging to the field of concrete material technology. It addresses the technical problems of unreasonable inorganic admixture ratios and low water-reducing agent efficiency in the preparation of high-performance concrete in existing technologies. The ultra-high strength high-performance concrete comprises cement mortar, water, a modified water-reducing agent, composite mineral admixtures, and fiber materials modified with a silane coupling agent. A modified water-reducing agent is obtained by polymerizing chain monomers, sodium methacrylate sulfonate, methacrylic acid, and polyethylene glycol methacrylate. A composite mineral admixture is obtained by mixing silica fume, fly ash, and quartz. The ultra-high strength high-performance concrete prepared by this invention has the advantages of high stability, high strength, and high water-reducing efficiency.

The invention provides a doped corrosion-resistant dioxin-resistant silicon carbide wear-resistant ceramic material, and relates to the technical field of advanced ceramic materials, the material comprises, by weight, 80-95 parts of silicon carbide powder, 1-10 parts of a functional dopant, 2-8 parts of a sintering aid, 2-5 parts of a flexibilizer, 0.5-3 parts of a dispersant, and 0.5-10 parts of a binder. The core function dopant is core-shell structure nano-powder with an anatase TiO2 core and a mixed valence Ce / Sn silicate shell, and is prepared through sol-gel and heat treatment. On the basis of keeping high strength and high wear resistance of silicon carbide ceramic, the material is successfully endowed with long-acting and stable chemical corrosion resistance and high-temperature dioxin catalytic degradation capability, and the material is suitable for extreme environments such as waste incineration and chemical engineering.

The invention provides an impregnation preparation method and impregnation liquid for an ultrahigh-temperature ceramic phase modified C / SiC composite material, and aims to solve the problem that the existing method for treating a reinforcement body through a silane coupling agent or improving interface bonding and improving the infiltration effect by using an impregnant with a specific formula cannot be used for treating a complex component or pursuing higher compactness. The impregnation is not uniform; more internal residual pores exist; and the improvement of the impregnation efficiency is limited. According to the impregnation preparation method of the ultra-high-temperature ceramic phase modified C / SiC composite material, a composite wetting agent composed of a penetration promoting type surfactant and an interface modification type coupling agent is introduced into an impregnation resin system, so that the surface tension of the resin is remarkably reduced, and meanwhile, the interface compatibility of the resin and carbon fibers is improved; and under the synergistic effect of the subsequent vacuum-pressure impregnation process, various pores in the C / SiC composite material preform can be more quickly and deeply filled, so that the deep, quick and uniform penetration of the resin into the C / SiC composite material preform is realized.

The utility model relates to metal processing equipment technical field discloses a kind of metal powder vacuum sintering furnace of temperature control is convenient, including vacuum furnace body, workpiece loading platform and bottom plate, workpiece loading platform lower end surface and the vacuum furnace body inner bottom surface are fixed, and the vacuum furnace body lower end surface and the bottom plate upper end surface fixed connection bottom plate upper end surface fixed connection have electric heater and pulse current generator;Vacuum furnace body inner wall surface fixed connection has three groups of heating coil pipes, and three groups of the heating coil pipe are evenly distributed along the circumferential direction of vacuum furnace body;The input end and output end of three groups of the heating coil pipe are connected with the electric heater to form independent loop by high-temperature resistant wire. The device can rapidly and uniformly heat metal powder, and optimize its sintering effect and microstructure by electric pulse treatment, improve density and mechanical properties;At the same time, real-time monitoring temperature and air pressure ensure the accurate control of sintering process, improve quality and efficiency.