35results about How to "Dense microstructure" patented technology

The invention provides magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate, 30-50 parts of active magnesium oxide, 0.5-3 parts of a retarder, 5-15 parts of a mineral admixture, 0.5-4 parts of a functional additive, 20-30 parts of fine aggregate, 2-5 parts of reinforced fibers and 10-28 parts of water. The invention also provides a preparation method of the magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete provided by the invention has a multi-layer anti-corrosion barrier, a compact microstructure, an intelligent ion barrier and good environmental adaptability, and can meet the use requirements in complex and severe environments.

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention discloses a red copper strip for an IGBT copper substrate and a processing method of the red copper strip, and belongs to the technical field of red copper processing. The red copper material is smelted, cast and processed into a cast ingot; heating is conducted in a stepping heating mode, the temperature range is 840-1000 DEG C, hot rolling and face milling are conducted, and a strip with the thickness being 15-20 mm is machined; rough rolling is conducted on the strip, and the strip is machined to be 3.8-4 mm in thickness through 8-pass rolling; annealing and cleaning; the cleaned strip is subjected to two-pass finish rolling, and a strip with the thickness ranging from 2.8 mm to 3.5 mm is formed; and cleaning to obtain the red copper strip for the IGBT copper substrate. The heat treatment, rough rolling and annealing processes in the red copper machining process are improved, the obtained red copper strip for the IGBT copper substrate is good in surface consistency, and the heat conduction performance is improved when the red copper strip is applied to an IGBT module.

The invention relates to a high-entropy oxide wave-absorbing ceramic powder material as well as a preparation method and application thereof, belongs to the technical field of electromagnetic wave absorbing materials, and solves the problems of poor high-temperature resistance and oxidation resistance and low absorption efficiency on low-frequency wave bands of an existing electromagnetic wave absorbing material. The high-entropy oxide ceramic material has a perovskite structure, the molecular structure is ABO3, A comprises La and Sr, and B is at least five elements of Cr, Ni, Mn, Fe, Co, Zr, Hf and Ti. According to the invention, the high-entropy oxide is combined with the perovskite structure, the electromagnetic function of the high-entropy oxide ceramic material is accurately regulated and controlled, and effective absorption of low-frequency electromagnetic waves is realized; the material has oxidation resistance and thermal stability under a high-temperature condition, and excellent electromagnetic function strength of the material at a high temperature is maintained. According to the high-entropy oxide ceramic powder material, the range of an electromagnetic wave absorbing material is widened, the environmental adaptability is improved, and higher requirements of development of a communication technology on the electromagnetic wave absorbing material are met.

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 low-shrinkage high-airtightness concrete special cementing material and a preparation method thereof. The special cementing material comprises 48-63wt% low-heat Portland cement clinker, 6-14wt% sulphoaluminate cement clinker, 3-5wt% light-burned magnesia, 7-10wt% sub-micron silica fume, 9-18wt% fly ash, 6-12wt% glass powder, 2-3wt% gypsum, 0.03wt% diethanol mono-isopropanol amine and 0.1wt% pre-dispersed carbon nanotubes. The special cementing material has reasonable particle size distribution, and the components produce interactive superposition effects, complement each other and promote each other, so that the cementing material after hydration is continuously compacted, and the airtight concrete prepared by the special cementing material can maintain excellent airtight performance and volume stability at each stage.

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 invention relates to the technical field of welding, in particular to a welding method for a titanium boride reinforced aluminum-based composite material, which comprises the following steps of: ensuring that the surface of the titanium boride reinforced aluminum-based composite material to be welded is clean and free of impurities such as oil stains and oxides; heating a welding bead by using heating equipment until the temperature reaches 200-250 DEG C, and completing primary preheating; in the friction stir welding process, the welding bead is secondarily preheated on the front side of the stirring head through the heating equipment, and the secondary preheating temperature ranges from 300 DEG C to 350 DEG C; in the friction stir welding process, cooling equipment is arranged on the rear side of a stirring head to rapidly cool a welded welding bead; after welding is completed, a welding bead is polished; and welding bead quality detection is carried out, and a defect-free welding joint which is good in appearance forming and fine in microstructure can be obtained.

The application discloses an ultrasonic rolling assisted laser additive manufacturing method and device, and belongs to the technical field of additive manufacturing. The ultrasonic rolling system is fixed on the laser deposition device through a support, and a forming base plate is fixed in a cooling water tank, so that synchronous ultrasonic rolling and temperature regulation and control are realized on a deposited layer in an additive process. By applying ultrasonic vibration in a molten pool solidification stage, grains are refined, and internal defects are reduced. The rolling module adopts a roller type structure design, ensures effective ultrasonic transmission, utilizes the integrated ultrasonic vibration roller to apply high-frequency vibration pressure behind the molten pool, generates plastic deformation on the material in a high-temperature plastic state, reduces residual stress, improves surface roughness, densifies and optimizes the microstructure. Through water cooling temperature control, the influence of thermal accumulation of the deposited layer on the ultrasonic rolling layer is reduced, the interlayer organization consistency is improved, and the overall organization uniformity regulation and performance improvement of the laser additive manufacturing component are realized.

The invention relates to the field of piezoelectric ceramic materials, and in particular to a method for preparing a potassium sodium niobate-based lead-free piezoelectric ceramic. A two-step molten salt method is adopted to synthesize a KNN prefabricated powder, the KNN prefabricated powder, a BNT prefabricated powder and a LS prefabricated powder are mixed and ball-milled and dried, a binder is added to granulate, sieve and press to obtain a green body, the green body is heated to 500-600 DEG C in a first stage, kept warm for debinding for 1-5 hours, and then heated to 1000-1150 DEG C in a second stage, kept warm for sintering for 1-5 hours. The potassium sodium niobate-based lead-free piezoelectric ceramic prepared by the invention has excellent piezoelectric properties and can meet the application requirements of small components, precision instrument control and other equipment.

A method for preparing slurry-coated recycled aggregate by utilizing carbon mineralization comprises the following steps: carrying out carbon mineralization treatment on collected recycled concrete aggregate until carbon is completely mineralized to obtain primarily mineralized recycled aggregate, soaking the primarily mineralized recycled aggregate by utilizing a saturated calcium hydroxide solution, and drying to obtain the slurry-coated recycled aggregate. And then wrapping the soaked recycled aggregate with newly mixed cement paste with a low water-binder ratio, then adjusting the water content of the slurry-wrapped recycled aggregate through drying treatment, and finally mineralizing the slurry-wrapped recycled aggregate again by using CO2 to obtain the high-quality carbon mineralized slurry-wrapped recycled aggregate. According to the method, rapid and high-degree carbon mineralization of the recycled aggregate is achieved, and then the recycled aggregate which is compact in structure, low in porosity, low in water absorption rate, low in crushing index and excellent in mechanical property and permeation resistance is obtained; meanwhile, construction waste is effectively recycled and utilized, and the raw material cost, energy consumption and carbon emission in the concrete preparation process are reduced.

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 skeleton-supported solid waste-based cementing material and a preparation method thereof. The cementing material is prepared from the following raw materials: fire coal slag, desulfurized fly ash, iron tailings, an ion complexing agent, an exciting agent and water, wherein the main raw materials comprise the following components in parts by mass: 30 to 45 parts of fire coal slag, 5 to 10 parts of desulfurized fly ash and 50 to 60 parts of iron tailings; the ion complexing agent accounts for 0.05%-0.2% of the main raw materials, the exciting agent accounts for 2%-6% of the main raw materials, and the water accounts for 30%-50% of the main raw materials. According to the preparation method provided by the invention, the framework-supported solid-waste-based cementing material with excellent performance is prepared by taking the fire coal slag, the desulfurized ash and the iron tailings as raw materials through simple ball milling and adding a small amount of excitant and ion complexing agent under the combined action of active silicon-aluminum dissolution, iron-based hydration product density enhancement and particle framework support.

The invention discloses a casting-molded wind power retainer and a bearing, and belongs to the technical field of bearing retainers. The retainer is defined by at least two unit retainers. Each unit retainer comprises a first end plate, a second end plate and a third end plate, the first end plate and the second end plate are each of an annular plate-shaped structure, and the first end plate and the second end plate are concentrically arranged; one end of each spacing plate is connected with the first end plate, the other end of each spacing plate is connected with the second end plate, and a pocket is formed between every two adjacent spacing plates; the limiting units are connected with the spacing plate, one part of the limiting units extend by a preset distance in the direction of the circle center of the first end plate, and the other part of the limiting units extend by a preset distance in the direction away from the circle center of the first end plate; the first end plate, the second end plate, the spacing plate and the limiting unit are integrally formed through high-pressure casting. The technical problem that in a three-row rolling body slewing bearing structure, the motion amplitude of a vertical bearing unit holder is too large is solved.

The invention provides a ferroelectric ceramic material with a large dielectric constant in a wide temperature range and a preparation method of the ferroelectric ceramic material. The ferroelectric ceramic material is prepared by laminating and compounding BZT-xBST ceramic blanks of six critical ferroelectric phase change components (x is 0.1, 0.2, 0.3, 0.4, 0.6 and 0.8) in a system of the ferroelectric ceramic material; the ferroelectric ceramic material is prepared by laminating and compounding six different components of BZT-xBST ceramic blanks, the high dielectric property is successfully realized in a wide temperature range of 5-55 DEG C, and the high dielectric constant (epsilon gt; 21448), the ferroelectric ceramic material can show excellent performance in various application scenes such as capacitors, sensors, energy storage devices and the like, and the blank area that the wide temperature range and the high dielectric constant of the existing ferroelectric ceramic material are difficult to obtain at the same time is filled.

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 relates to the technical field of photovoltaic packaging materials, in particular to an EPE three-layer co-extrusion adhesive film and a preparation method and application thereof. The EPE three-layer co-extrusion adhesive film comprises a first EVA layer, a POE layer and a second EVA layer which are arranged in sequence; the first EVA layer and the second EVA layer respectively and independently comprise EVA resin, modified EVA resin, a compatilizer, a cross-linking agent, an assistant cross-linking agent, a silane coupling agent and an antioxidant; the POE layer comprises modified POE resin, a compatilizer, a cross-linking agent, an assistant cross-linking agent, a silane coupling agent and an antioxidant; the modified EVA resin comprises at least two kinds of EVA resin grafted and modified by polybutadiene with different molecular weights; the modified POE resin comprises at least two kinds of POE resin grafted and modified by polybutadiene with different vinyl contents. According to the EPE three-layer co-extrusion adhesive film disclosed by the invention, the auxiliaries are not easy to migrate, and meanwhile, the EPE three-layer co-extrusion adhesive film has high adhesive property, high crosslinking degree, high water resistance, aging resistance and the like.

The invention belongs to the technical field of concrete pipe pile processing, and particularly relates to a functional aggregate-containing pipe pile and a preparation method thereof, the functional aggregate-containing pipe pile comprises reinforcing steel bars and concrete, the concrete is poured outside the reinforcing steel bars, and the concrete comprises the following components in parts by weight: 680-870 parts of functional aggregate, 156-244 parts of self-repairing aggregate, 20-78 parts of cement, 15-20 parts of a water reducing agent and 25-60 parts of water. Through the synergistic effect of the functional aggregate and the self-repairing aggregate and the optimized proportion and preparation technology, the concrete pipe pile can adapt to infrastructure in the land environment and can also adapt to infrastructure in the marine environment, and the practicability of the concrete pipe pile is further improved.

A silver-graphene composite coating and a preparation method and application thereof belong to the technical field of electrical materials, and overcome the defects of high contact resistance, poor corrosion resistance, heat dissipation and wear resistance in the prior art. The silver-graphene composite coating of the present invention comprises a first nanosilver layer, a silver-graphene layer and a second nanosilver layer sequentially arranged on a substrate. The thermal conductivity of the silver-graphene composite coating provided by the present invention is ≥330W / m·K; the hardness is ≥80HV; the surface contact resistance is <20μΩ; the dynamic friction coefficient of the coating is ≤0.25; the environmental corrosion resistance of the coating satisfies the anti-sulfur test in 1% Na2S solution within 5h without discoloration, and the anti-sulfur test in 5% Na2S solution is 1h without discoloration.

The invention discloses external wall anti-crack mortar for a plateau area. The external wall anti-crack mortar is prepared from the following components in parts by weight: 200 to 400 parts of cement, 10 to 300 parts of admixture, 400 to 650 parts of sand, 0.5 to 5 parts of carbon nano tube, 5 to 10 parts of nano silicon dioxide, 0.1 to 0.5 part of water-retaining agent, 0.1 to 0.5 part of air entraining agent, 1 to 3 parts of early strength agent, 0.3 to 1.0 part of water reducing agent and 2 parts of fiber, compared with the prior art, for plateau areas, the bonding strength, anti-seepage pressure and other properties of the mortar are greatly improved.

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 belongs to the technical field of air power supplies, and relates to a flexible aluminum anode and a flexible aluminum air power supply. The flexible aluminum anode provided by the invention has the aluminum-zinc alloy layer on the surface, and the alloy layer is prepared by installing flexible metal aluminum on the rotating shaft, conveying the flexible metal aluminum under the driving of the rotating shaft, spreading zinc chloride on the surface of the flexible metal aluminum in conveying, and controlling the conveying rate and the heating temperature. The process can be continuously carried out, is simple and easy to operate, and can meet the requirements of large-scale industrial production. The flexible aluminum anode can be applied to a flexible aluminum air power supply, the aluminum-zinc alloy layer on the surface of the flexible aluminum anode can relieve the self-corrosion problem when pure metal aluminum serves as the aluminum air power supply anode, and the flexible aluminum anode is compact in microstructure, large in specific surface area and capable of effectively improving the power generation efficiency of the power supply. The flexible aluminum air power supply containing the flexible aluminum anode can be widely applied to flexible equipment such as a flexible watch, an intelligent flexible sensor or a flexible outdoor power supply.

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 relates to the technical field of tail gas treatment, in particular to a preparation method of a composite filter material for purifying incineration tail gas, which comprises the following steps: S1, adding tetraethoxysilane, hydrochloric acid, water and ethanol into a mixer, uniformly mixing, and stirring while controlling the heating temperature to obtain silicate gel, immersing the copolymer core layer into silicate gel for dipping to obtain a middle shell layer; and S2, adding polytetrafluoroethylene resin, ammonium perfluorooctanoate and water into a mixer, uniformly mixing, dispersing through a high-speed stirrer to obtain a polytetrafluoroethylene dispersion liquid, uniformly coating the surface of the middle shell layer with the polytetrafluoroethylene dispersion liquid, and sintering in a high-temperature furnace. According to the multi-layer structure of the composite filter material, multi-stage filtration of incineration tail gas is achieved, the tail gas treatment efficiency and effect are improved, the content of harmful substances in emissions is reduced, and the service life of the filter material is prolonged.

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.