83results 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.

According to the composite protective coating for the bolt surface, the preparation method and the application, the composite coating takes a bolt of a common model of an iron tower as a substrate, and a cathode arc ion plating technology and a magnetron sputtering technology are combined; the preparation method comprises the four main steps of substrate surface pretreatment, metal bonding layer preparation, metal nitride bearing layer preparation and surface molybdenum disulfide solid self-lubricating layer preparation. According to the method, reliable preparation of the composite coating on the complex thread surface of the bolt is achieved, the anti-loosening capacity of the bolt is remarkably improved through the low friction coefficient, good bearing capacity and excellent wear resistance, and meanwhile the composite coating further has good corrosion resistance and has wide application prospects in iron towers for communication, electric power and the like.

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 method and application of a nanocomposite excitation solution to strengthen the mineralization of solid waste materials, and belongs to the field of solid waste-CO 2 The technical field of underground joint disposal in coal mines. Sodium silicate is added to a sodium hydroxide solution to obtain an alkaline excitation solution, a polycarboxylic acid water reducer is mixed into the alkaline excitation solution, and an alkaline excitation base liquid is obtained; nano-scale silica particles are finally added to the alkaline excitation base liquid and mixed to obtain a nano-composite excitation solution, the nano-composite excitation solution is subjected to ultrasonic vibration at room temperature until it becomes transparent, and then solid materials are added to mix to obtain a solid waste material slurry, and then carbon dioxide gas is introduced into the solid waste material slurry while stirring to achieve mineralization; the gas-liquid two-phase interface area of ​​the solid waste material slurry is increased by nano-scale silica particles, and the diffusion coefficient of Brownian motion is increased, and at the same time, the nano-scale silica particles provide nucleation sites to better adsorb carbon dioxide, and the steps are simple and easy to implement.

The invention discloses coal gasification slag-based self-foaming lightweight concrete and a preparation method thereof, and relates to the field of comprehensive utilization of lightweight foam concrete and solid wastes. The coal gasification slag-based self-foaming lightweight concrete is prepared from the following components in parts by weight: 50 to 60 parts of coal gasification fine slag, 20 to 30 parts of waste incineration bottom ash, 10 to 30 parts of composite admixture, 5 to 20 parts of composite exciting agent, 20 to 40 parts of fine aggregate, 40 to 60 parts of water, 0.3 to 0.5 part of sodium lactate, 0.3 to 0.5 part of water reducing agent, 0.3 to 0.7 part of cellulose ether and 0.3 to 0.5 part of redispersible latex powder. The invention has the advantages of low manufacturing cost, small environmental pollution, simple process flow, multiple curing modes and excellent performance in various aspects, can replace the traditional foam concrete, can effectively reduce the use of cement-based cementing materials, and promotes the recycling and large-scale utilization of solid waste materials.

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 preparation method of a high-humidity-resistant wood-based friction nano-generator, and relates to a preparation method of a friction nano-generator. The invention aims to solve the problems that the existing natural wood has anisotropy, poor conductivity and poor friction polarity and cannot be directly applied to a friction nano-generator; the problems that modification treatment adopted when wood serves as a friction material in the prior art causes harm to the environment and is extremely poor in biocompatibility, and the output performance of a wood-based friction nanometer generator is prone to being affected by high humidity are solved. The method comprises the following steps: 1, preparing a friction material; 2, preparing an electrode material; and 3, assembling the wood-based friction nano generator. The preparation method is used for preparing the high-humidity-resistant wood-based friction nanometer generator.

The invention discloses a high-conductivity composite material with silicone rubber reinforced by graphene nanosheets. A preparation method of the composite material comprises the following steps: S1, hydroxyl-terminated polydimethylsiloxane is selected as a silicone rubber matrix, and modified graphene nanosheets are selected as a reinforcing material; s2, modifying the graphene nanosheets; s3, the modified graphene nanosheets are dispersed; s4, mixing the composite material; s5, adding a cross-linking agent and a catalyst; and S6, forming and vulcanizing: injecting the uniformly mixed composite material into a mold and vulcanizing. The composite material prepared by the invention has high conductivity, excellent mechanical properties and good thermal stability, and is suitable for the fields of electronic elements, conductive adhesives and the like.

The invention relates to a method for preparing a seawater and sea sand recycled concrete beam reinforced by FRP (Fiber Reinforce Plastic) ribs cured by CO2, which comprises the following steps of: (1) mixing recycled aggregate, sea sand, artificially simulated seawater, a water reducing agent and cement to prepare seawater and sea sand recycled concrete; (2) mounting a bottom template; (3) FRP ribs are laid, and a sleeve used for forming a hole channel is erected; (4) side formworks are installed; (5) injecting the stirred seawater and sea sand recycled concrete into the mold, forming a test block after the concrete is poured, and feeding the test block into a curing chamber for standard curing; (6) after the expected standard curing time is reached, the erected sleeve is pulled out from the test block, and pore channels needed by concrete carbonization near the FRP ribs are exposed; the durability of the concrete is improved, and the defect that the long-term performance degradation of the FRP reinforcing steel bar is easily caused by high pH value of the concrete is overcome.

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 discloses a method for preparing a MoCoB-based metal ceramic. The disclosed method comprises: using cobalt boride powder and molybdenum powder as raw materials, firstly ball milling by wet milling, then drying by rotary evaporator, and then sintering by spark plasma sintering; by mass percentage, the cobalt boride powder is 45% to 63.0%, and the molybdenum powder is 37.0% to 55.0%; the ball milling is carried out in an inert gas atmosphere, and the ball milling process control agent is one of ethyl acetate, anhydrous ethanol and acetone. The invention uses cobalt boride powder and molybdenum powder as raw materials, and adopts wet ball milling and rotary evaporator drying processes, which improves the preparation efficiency and shortens the preparation cycle by about 76.9% to 94.2%; at the same time, it also improves the problem of segregation of mixed powder components, and prepares a MoCoB-based metal ceramic with a denser microstructure and good comprehensive mechanical properties.

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 invention provides a lake sludge-based unfired wetland ceramsite substrate and a preparation method thereof. The ceramsite substrate is prepared from the following raw materials in parts by mass: 55 to 65 parts of mud cake, 10 to 30 parts of slag, 10 to 30 parts of fly ash, 3 to 7 parts of sodium hydroxide solution and water. The ceramsite substrate is prepared by the following steps: S1, proportioning: drying, crushing and grinding a prepared mud cake to obtain mud powder; s2, mixing the materials to prepare a mud pie; s3, preparing ceramsite green pellets; s4, carrying out steam curing on the ceramsite green balls in the step 3 to obtain ceramsite with pores; and S5, carrying out water retention and natural curing on the ceramsite to obtain the ceramsite substrate. The ceramsite matrix prepared by the invention takes lake dredged sludge as a main raw material and industrial wastes such as fly ash and slag as auxiliary materials, is green and environment-friendly, is reasonable in cost, not only realizes effective recycling of resources, but also can reduce energy consumption, forms an environment functional material with a water purification effect, achieves the effect of treating wastes with wastes, and achieves multiple purposes.

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 a composite polymer electrolyte for a lithium air battery and a preparation method thereof, and belongs to the technical field of composite materials. The composite polymer electrolyte for the lithium air battery is prepared by taking a self-made conductive polymer, polyoxyethylene, aerogel filler and lithium electrolyte as raw materials; the preparation method comprises the following steps: dissolving a conductive polymer, polyoxyethylene and a lithium electrolyte with an organic solvent, stirring and mixing to obtain a composite polymer electrolyte solution, adding an aerogel filler into the composite polymer electrolyte solution, carrying out ultrasonic dispersion to obtain a gel polymer electrolyte, and finally immersing a battery diaphragm into the gel polymer electrolyte. The composite polymer electrolyte for the lithium air battery prepared by the preparation method disclosed by the invention is more compact in structure and small in internal resistance, and the cycling stability of the battery can be effectively improved.

The invention relates to a water mist cooling process for aluminum alloy spoke machining, and relates to the field of wheel machining. The water mist cooling process for aluminum alloy spoke machining comprises the steps that smelting is conducted, specifically, aluminum alloy ingredients with a preset proportion are added into a smelting furnace and heated to be molten, and molten aluminum is formed; refining: nitrogen is introduced into the molten aluminum for rotary degassing refining treatment, and first casting liquid is formed; refining, specifically, a refiner and a modifier are added into the first casting liquid, and second casting liquid is formed through deslagging treatment; casting is conducted, specifically, the second casting liquid is pumped into a low-pressure casting mold to form a casting blank; and cooling is conducted, specifically, the low-pressure casting mold is subjected to water mist cooling, and a casting finished product is formed. According to the method, rapid solidification of the spoke casting can be achieved, the casting period is shortened, the production efficiency is improved, and meanwhile the casting is small in grain, more compact in microstructure and higher in performance strength.

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.

The invention relates to the field of piezoelectric ceramic materials, in particular to a preparation method of potassium-sodium niobate-based lead-free piezoelectric ceramic, which comprises the following steps: synthesizing KNN prefabricated powder by adopting a two-step molten salt method, mixing, ball-milling and drying the KNN prefabricated powder, BNT prefabricated powder and LS prefabricated powder, adding a binder, granulating, sieving, pressing to obtain a green body, heating the green body to 500-600 DEG C in the first stage, keeping the temperature and discharging glue for 1-5 hours, and cooling to room temperature to obtain the potassium-sodium niobate-based lead-free piezoelectric ceramic. The potassium-sodium niobate-based leadless piezoelectric ceramic prepared by the preparation method disclosed by the invention has excellent piezoelectric property, and can meet the application requirements of equipment such as small-sized components, precise instrument control and the like.

The invention relates to a high-density silicon carbide refractory brick added with silicon nitride for a garbage incinerator, which is prepared from the following components in percentage by mass: 55 to 85 percent of silicon carbide stone, 10 to 45 percent of additive and 1 to 3 percent of compound mineralizer, the additive comprises silicon nitride, silicon carbide, metal silicon and fused quartz; the additive at least adopts one kind of silicon nitride; and the composite mineralizing agent is FeO or CaO. The silicon carbide refractory brick has the beneficial effects that silicon nitride is adopted as an additive, the prepared silicon carbide refractory brick is high in compactness and relatively low in porosity, and grains are tightly combined to form a mosaic structure; the silicon nitride is added, so that the sample compactness of the silicon carbide brick can be improved; compared with an existing refractory brick without silicon nitride, the refractory brick prepared by the invention is high in tridymite content and more compact in microstructure, the refractory temperature is 1750 DEG C, and the refractory brick can be used as a masonry material of a household garbage furnace.

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.