95 results about "Nanostructured titanium" patented technology

The invention discloses a method for preparing nano barium titanate based on sol-gel synergistic hydrothermal reaction, which comprises the following steps: (1) dissolving barium acetate in an acetic acid aqueous solution to obtain a barium source solution; weighing tetrabutyl titanate according to the molar ratio of barium to titanium being greater than 1.25, and dissolving the tetrabutyl titanate in alcohol to obtain a titanium source solution; (2) uniformly mixing the barium source solution and the titanium source solution, preserving heat at 20-80 DEG C to obtain gel, drying and grinding to obtain white powder of the barium titanate precursor: (3) preparing a 2-4mol / L inorganic strong alkali aqueous solution, adding the white powder and a dispersing agent into the inorganic strong alkali aqueous solution, and fully stirring to obtain a barium titanate precursor suspension; and (4) transferring the barium titanate precursor suspension into a reaction kettle for hydrothermal reaction, and after the reaction is completed, washing, drying and grinding to obtain the nano barium titanate powder. The preparation method is low in cost, and the prepared nano barium titanate powder is uniform in distribution, spherical or sphere-like in morphology, small in particle size, 80-150nm in average particle size and good in particle crystallinity.

The invention relates to the technical field of coatings, in particular to a coating suitable for niobium-silicon alloy surface high-temperature protection and a preparation method of the coating. The coating comprises the following raw materials in parts by weight: 100-120 parts of deionized water, 60-80 parts of nickel-chromium-aluminum-yttrium alloy powder, 60-80 parts of enamel glaze, 50-60 parts of filler, 20-40 parts of a binder, 10-20 parts of nano titanium dioxide and 6-10 parts of an additive. According to the invention, during preparation of the coating, through addition of the filler, the negative thermal expansion performance of zirconium tungstate in the filler and volume shrinkage of zirconium tungstate in a high-temperature state, a buffer space is provided for thermal expansion of other materials in the coating, cracks of the coating due to thermal stress are avoided, and the high-temperature resistance of the coating is improved; kH560 enhances the interfacial compatibility of zirconium tungstate, avoids agglomeration of zirconium tungstate, and enables the zirconium tungstate to be more uniformly distributed in a coating system.

The invention discloses a preparation method of an ABM ceramic substrate with a metal through hole, and particularly relates to the technical field of ceramic substrates, a Si3N4 ceramic substrate is prepared through tape casting and hot pressed sintering, a conical stepped through hole is processed by using ultrafast femtosecond laser, the aperture of the through hole is 100-300 [mu] m, and the smoothness of the wall of the through hole is Rat; 1 [mu] m; performing oxygen plasma activation on the inner wall of the through hole to generate a Si-O active group; sputtering a nano titanium transition layer to enhance metal-ceramic interface bonding; the through holes are filled layer by layer through pulse electrochemical deposition, the current density is controlled, and a compact non-porous structure is achieved; in-Sn-Ag low-temperature active brazing filler metal is used, and a surface copper layer is bonded under the assistance of plasma; a fine circuit is formed through photoetching and micro-electroplating, the line width and the spacing of the circuit are the same, and the line width and the spacing of the circuit are both smaller than 20 microns; etching a micro-channel network on the back surface of the substrate by using ultraviolet laser, and filling heat-conducting silicone grease; and finally, carrying out vacuum annealing for 2 hours in an environment with the temperature of 250 DEG C.

The invention discloses an antibacterial modified full-dull polyester fiber and a preparation method thereof, belongs to the technical field of polyester fiber processing, and is used for solving the technical problem that the mechanical property and the antibacterial property of the full-dull polyester fiber in the prior art need to be further improved. The composite material specifically comprises the following components in parts by weight: 50-60 parts of polyethylene glycol terephthalate, 40-50 parts of activated modified polyester, 25-35 parts of epoxy modified polyolefin, 5-7 parts of PEG modified titanium and 2-3 parts of an auxiliary additive. According to the full-dull polyester fiber disclosed by the invention, zinc modified nano titanium is modified by polyethylene glycol, and then polyethylene glycol terephthalate is enhanced by the modified zinc modified nano titanium, cross-linked and bonded activated modified polyester with reaction activity and epoxy modified polyolefin, so that the mechanical strength and the ultraviolet aging resistance of the full-dull polyester fiber are effectively improved; the antibacterial property and the washing resistance of the full-dull polyester fiber are also improved.

The invention discloses a preparation method of a nano silicon dioxide modified high-density polyethylene wear-resistant plate, and belongs to the technical field of polyethylene plates, the method comprises the following steps: firstly preparing an antioxidant PMMA microcapsule, then preparing titanium dioxide and silicon dioxide, and modifying by KH550 to obtain modified nano titanium-silicon composite particles; then, an antioxidant coated PMMA microcapsule, the modified nano titanium-silicon composite particles, POE-g-MAH and HDPE particles are premixed, and the wear-resistant plate is obtained through twin-screw extrusion granulation and pulsating force field assisted molding; through the synergistic effect of the antioxidant coated PMMA microcapsule, the modified nano titanium-silicon composite particles and the compatilizer POE-g-MAH, the problems that the wear resistance of the HDPE plate is insufficient and the antioxidant is easily adsorbed by nano silicon dioxide to cause aging resistance attenuation are solved, and the wear resistance, thermal oxidation / light aging resistance and mechanical property improvement of the plate are realized; and the requirements of high-frequency wear scenes such as mine conveying and outdoor engineering can be met.

The invention relates to a method and a device for preparing piezoelectric catalytic degradation PFAS nano barium titanate from sludge graded extracts, and belongs to the technical field of sludge utilization environments. The method comprises the following steps: uniformly mixing fresh sludge and modified cation resin, and extracting a cation resin extracting solution to obtain the cation resin extracting solution and cation sludge; uniformly mixing the cation mud and the modified anion resin, and extracting an anion resin extracting solution to obtain the anion resin extracting solution and the cation mud; mixing the sludge and alkali for reaction to obtain an alkali extracting solution and extraction residues; mixing barium salt with the cation resin extracting solution to obtain a barium complexing solution, and mixing titanium salt with the anion resin extracting solution to obtain a titanium complexing solution; and mixing the barium complexing solution with the same volume of the alkali extracting solution, then adding the titanium complexing solution with the same molar ratio, heating, drying and calcining to obtain the piezoelectric catalytic degradation PFAS nano barium titanate. According to the method, multi-stage extraction can be carried out according to application property requirements, extraction is sufficient, the comprehensive utilization rate of sludge is high, dispersity is good, the particle size is small, piezoelectric catalysis performance is high, and synthesis cost is low.

The invention relates to the technical field of dielectric ceramic powder preparation processes, in particular to a multilayer ceramic capacitor, high-activity nano barium titanate powder for the multilayer ceramic capacitor and a preparation method of the high-activity nano barium titanate powder, and the method comprises the following steps: (1) reacting soluble barium salt with a precipitator to obtain barium carbonate precursor particles with high specific surface area; (2) uniformly coating the surfaces of the barium carbonate precursor particles with nano titanium dioxide particles by using a supercritical fluid flash evaporation technology to form a composite precursor; and (3) carrying out solid-phase synthesis reaction on the composite precursor, and sintering to obtain the nano barium titanate powder. Through the synergistic effect of two means of high-activity precursor preparation and nanoscale uniform coating, the composite precursor with extremely high specific surface area, surface energy and microcosmic uniformity is prepared, the thermal sintering temperature is effectively reduced, abnormal growth of crystal grains and lattice distortion are restrained, and the preparation method has the advantages that the preparation process is simple, and the preparation cost is low. The tetragonality of the nano barium titanate powder is obviously improved.

The present application relates to the technical field of dielectric ceramic powder preparation, and particularly relates to a multilayer ceramic capacitor, a high-activity nano-barium titanate powder for the multilayer ceramic capacitor and a preparation method of the high-activity nano-barium titanate powder, the method comprising the following steps: (1) reacting a soluble barium salt with a precipitator to obtain barium carbonate precursor particles with high specific surface area; (2) uniformly coating nano-titanium dioxide particles on the surface of the barium carbonate precursor particles by using a supercritical fluid flash technology to form a composite precursor; and (3) performing a solid-phase synthesis reaction on the composite precursor and sintering to obtain nano-barium titanate powder. The present application, through the synergistic effect of the two means of "high-activity precursor preparation" and "nano-level uniform coating", prepares a composite precursor with extremely high specific surface area, surface energy and micro-uniformity, effectively reduces the heat sintering temperature, suppresses abnormal grain growth and lattice distortion, and significantly improves the tetragonality of the nano-barium titanate powder.

The invention provides an electroplating strengthening method for an aluminum alloy wheel. The electroplating strengthening method comprises the following steps: forming a periodic microstructure on the surface of the aluminum alloy wheel by utilizing a laser micro-etching technology; immersing the wheel into a supercritical carbon dioxide cleaning system to clean oil stains and oxidation films; after cleaning, spraying an active coating containing nano titanate; a high-compactness plating layer is formed in a pulse current electroplating mode; a chemical nickel-phosphorus plating layer and a hard chromium plating layer containing nano metal particles are sequentially formed on the surface of the wheel; performing hole sealing treatment on the electroplated layer by using low-temperature plasma; and coating and curing a flexible UV coating containing an ultraviolet light absorber on the surface of the electroplated layer to form the anti-aging protective film. According to the invention, a novel double cleaning-activating step is adopted in the pretreatment process, and special pre-plating passivation treatment is combined, so that tight combination of an electroplated layer and an aluminum alloy substrate is ensured, and the adhesive force grade reaches 5B, which is obviously superior to that of a traditional process.

The invention discloses a nano titanium-organic silicon modified epoxy resin anticorrosive coating and a preparation method and application thereof.The preparation method comprises the following steps that organic silicon modified epoxy resin is prepared, nano titanium functional filler is prepared, and then the prepared organic silicon modified epoxy resin, powder filler, a dispersing agent, a flatting agent and a defoaming agent are taken to be evenly mixed; adding into a mixed solvent, putting into a high-speed dispersion machine, and stirring at normal temperature at the rotating speed of 2000-3000rpm to obtain mixed slurry; then, adding a nano titanium functional filler, and stirring in a high-speed dispersion machine at normal temperature at the rotating speed of 2000-3000rpm to obtain a nano titanium-organic silicon modified epoxy resin coating; then adding an amine curing agent into the coating, mixing and stirring, and finally coating the surface of a base material with the coating and drying to obtain a cured coating. The high-temperature-resistant coating which is excellent in comprehensive performance and can provide anti-corrosion protection for high-temperature marine equipment for a long time is prepared.

The invention discloses an antistatic and antibacterial mixed fiber and a preparation method thereof, and belongs to the technical field of textile fabrics. The preparation method comprises the steps of fiber pretreatment, polycaprolactam graft modification, polyethylene glycol terephthalate graft modification, blending treatment and after-treatment. According to the invention, the PA6 (polycaprolactam) fiber is grafted and modified step by step to load quaternary ammonium salt, so that the long-acting antibacterial effect is realized; pET (polyethylene glycol terephthalate) fiber is grafted with a cationic monomer to construct an antistatic path, and the PET fiber and the cationic monomer are blended in a ratio of (6-7): (3-4), so that the performance and the mechanical strength are considered; a polythiophene conducting layer and silver-doped nano titanium sol are adopted in after-treatment, so that the surface is endowed with double antibacterial and efficient antistatic functions. According to the process, the environmental protection property and the production efficiency are remarkably improved through a water-phase reaction system and a padding-baking method, and the function retention rate is larger than or equal to 90% after 50 times of washing.

The invention discloses a modification method of nanoscale titanium dioxide. The preparation method comprises the following steps: carrying out pre-improvement treatment on nano titanium dioxide to obtain pre-improved nano titanium dioxide; the preparation method comprises the following steps: blending the pre-improved nano titanium dioxide and a ball milling agent according to a weight ratio of (5-7): 3, carrying out ball milling treatment, and carrying out suction filtration and drying after ball milling is finished. According to the modification method of the nano titanium dioxide, the nano titanium dioxide is subjected to pre-improvement treatment, an additive B in a modifier and a modified solution A are blended, blended and optimized, raw materials in a reconditioning agent are mutually matched and blended, a quartz solution is optimized and improved, and then a prepared ball milling agent is further matched with the modified additive in a system; and the performance effect of the product is further enhanced.

The invention relates to a high-heat-resistance PPS protective material and a preparation process thereof. The protection material is prepared from the following components in parts by weight: PPS resin, modified glass fiber, surface modified boron nitride, element doped modified silicon carbide, an ABS-g-MAH and POE-g-MAH compound, nano aluminum oxide, an antioxidant, an interface modifier and a synergistic stabilizer in a specific proportion. Wherein the modified glass fiber is prepared by reacting glass fiber with an ethanol solution, potassium hydroxide and the like; the surface modified boron nitride is obtained by treating nano boron nitride, a sodium hydroxide solution and the like; the element-doped modified silicon carbide is prepared by reacting silicon carbide powder with nano titanium powder and the like. The preparation process sequentially comprises the following steps: carrying out ultrasonic pretreatment and vacuum drying to obtain a mixture 1, mixing by a high-speed mixer to obtain a mixture 2, carrying out extrusion granulation and vacuum devolatilization by a twin-screw extruder, carrying out water-cooling granulation, drying to obtain granules, preparing a standard sample through injection molding, testing the performance and the like, wherein each step has corresponding specific parameters. The material has high heat resistance, the heat distortion temperature can reach 280 DEG C or above, and the material can be used as a protection material in the field needing high heat resistance.

The application provides a preparation method of a high-efficiency piezoelectric coating on a titanium implant surface. The preparation method of the application uses a hydrothermal treatment and an in-situ piezoelectric deposition technology to in-situ synthesize a nano strontium titanate-noble metal piezoelectric coating on the titanium implant surface. The coating can generate a piezoelectric potential and active oxygen through ultrasonic driving to degrade extracellular polymers and kill bacteria. In addition, the piezoelectric coating can also promote the osteogenic differentiation of bone marrow mesenchymal stem cells under piezoelectric stimulation, and finally realize the effects of bioactivity, long-acting drug-resistant bacteria and high-efficiency bone integration in the body. The application can provide a new surface treatment technology and research idea for controlling the drug-resistant bacteria infection on the implant surface, help to break through the limitations of the existing theory and technology in removing bacterial infection on the titanium implant surface, and provide beneficial guidance for the control of bacterial biofilm on other parts and the prevention and treatment of related infectious diseases.

This invention pertains to machining tools, specifically relating to a metal grinding wheel for drilling silicon carbide ceramics and its preparation method. Copper powder, tin powder, nano-titanium powder, diamond, and resin are ball-milled and then mixed with copper-tin alloy powder and resin to obtain a powder. This powder is then cold-pressed and sintered to obtain a metal grinding wheel for drilling silicon carbide ceramics. Previously, sintered metal grinding wheels used for processing ceramics such as zirconia and alumina could not meet the requirements for lifespan and quality when dealing with the harder and more brittle silicon carbide ceramics. This invention utilizes nano-titanium powder to achieve strong holding force and easy sintering, while adding a copper-tin alloy to improve the toughness of the binder, enhance the self-sharpening property of the product, increase cutting force, and ensure product quality and lifespan.

The invention discloses nanoscale Ti2O3, a preparation method and application of the nanoscale Ti2O3 as a catalyst carrier, and belongs to the technical field of nano material preparation. According to the invention, a solid-phase synthesis method is utilized, nano titanium powder and nano titanium dioxide are used as raw materials, and the nano-scale Ti2O3 brownish black powder with uniform particle size distribution is controllably synthesized. Meanwhile, a series of noble metal supported catalysts are synthesized by taking the catalyst as a catalyst carrier. According to the invention, rapid synthesis of nanoscale Ti2O3 is realized, and the particle size of the prepared sample is uniform and is about 300nm. The preparation method has the characteristics of high efficiency, rapidness, low equipment requirement, simplicity, easiness in repetition, high product purity and capability of realizing large-scale synthesis. Meanwhile, the prepared nanoscale Ti2O3 is small in size and uniform, so that a catalyst prepared by taking the nanoscale Ti2O3 as a carrier has relatively good dispersity, shows excellent electrocatalytic activity, can be prepared into catalyst slurry with relatively high uniformity, and is suitable for the fields of electrochemical catalysis and energy conversion.

The application provides a high-rate long-cycle natural graphite-based composite negative electrode material and a preparation method and application thereof. The natural graphite-based composite negative electrode material has the characteristics of high-rate performance, low volume expansion performance and long-cycle performance. Firstly, submicron flake graphite particles are granulated into particles with a pore structure in a form of spray granulation; then, heat treatment is performed under a protective atmosphere to convert pitch into amorphous carbon; then, chemical vapor deposition technology is adopted to uniformly distribute nano titanium in the pore structure between the submicron flake graphite inside the spherical graphite particles and on the surface of the spherical graphite particles; subsequently, the nano titanium is converted into titanium nitride through nitriding treatment, that is, titanium nitride is deposited in the pore structure between the submicron flake graphite inside the spherical graphite particles and on the surface of the spherical graphite particles, to prepare the natural graphite-based composite negative electrode material.

A method for preparing a nano-titanate, a nano-titanic acid and a nano-TiO2 containing embedded A nanoparticles is provided respectively. In this method, a Ti-T alloy with a A-group element solidly dissolved therein is used as a titanium source, and reacted with an alkali solution under a certain condition. In combination with subsequent treatment, the preparation of a titanate nanotube, a titanic acid nanotube, and a TiO2 nanotube / rod containing embedded A nanoparticles, respectively, is further achieved with high efficiency and low cost. Moreover, a method for preparing metal nanoparticles is also provided by removing the matrix of the composites. The present preparation methods is characterized by simple process, easy operation, high efficiency, low cost. The product is of promising application in polymer-based nanocomposites, ceramic materials, catalytic materials, photocatalytic materials, hydrophobic materials, effluent degrading materials, bactericidal coatings, anticorrosive coatings, marine coatings.

The invention discloses a polycarbonate material with high CTI (Comparative Tracking Index). The polycarbonate material comprises the following components in parts by weight: 70-90 parts of polycarbonate, 5-15 parts of nano titanium dioxide, 3-8 parts of metasilicate, 0.3-0.5 part of a coupling agent and 0.5-1 part of a lubricant. The invention further provides a preparation method and application of the high-CTI polycarbonate material. According to the high-CTI polycarbonate material and the preparation method and application thereof provided by the invention, the obtained polycarbonate material has excellent arc resistance and tracking resistance, also has good impact resistance and temperature resistance, and can be widely applied in scenes requiring strict electrical safety performance.

The invention discloses titanium-containing leather, which is prepared from a solvent-free PU (polyurethane) mixture prepared by mixing a component A and a component B through blade coating, baking, base cloth attaching and separation processes, and the component A comprises the following components in percentage by mass: 80-85% of polyether polyol, 12-15% of polyester polyol, 2-8% of nano titanium powder, 0.2-0.6% of a zinc-bismuth compound and 0.1-0.4% of a platinum-carbon catalyst. By adding nano titanium powder into a solvent-free PU mixture and combining a specific component ratio and a preparation process, the product has good high temperature resistance, super-strong corrosion resistance and antibacterial property and is suitable for various application scenes such as outdoors, home furnishing, fitness equipment and the like, the leather is endowed with excellent mechanical properties due to the super strength of titanium, the leather is suitable for lightweight design, and the cost is reduced. The leather material has the advantages of high temperature resistance, corrosion resistance, biocompatibility and the like, can be widely applied to the fields of new energy automobiles and aerospace, has excellent biocompatibility, and meets the requirements of scenes such as medical and physical therapy equipment, children products, dining table mats and the like on material safety.

The invention relates to nano barium titanate powder as well as a preparation method and application thereof, and belongs to the technical field of ceramic powder. The preparation method of the nano barium titanate powder provided by the invention comprises the following steps: S1, adding a titanium source into an acidic solution for hydrolysis reaction, neutralizing, heating, preserving heat, aging, filtering to obtain a solid, and calcining to obtain powder in S1; s2, adding the powder in S1 into the solution A, uniformly mixing, and reacting to obtain slurry in S2; oH <->, H2O2 and H2O in the solution A meet a specific molar ratio; and S3, adding a barium source into the slurry obtained in the step S2, enabling Ba / Ti to meet a specific molar ratio, adjusting to be alkaline, stirring, heating to boiling, preserving heat, then cooling, continuously preserving heat, filtering, drying and crushing to obtain the nano barium titanate powder. The nano barium titanate powder prepared by the preparation method provided by the invention is high in tetragonality, uniform in particle, good in crystallinity and wide in process application range, and meets the development requirements of ultrahigh-capacity MLCC.

The application relates to the alloy preparation technical field, and discloses a nano-titanium reinforced magnesium-based alloy, a preparation method thereof and mechanical equipment. The disclosed preparation method of the nano-titanium reinforced magnesium-based alloy comprises the following steps: uniformly dispersing nano-titanium particles in paraffin to obtain a paraffin preform; heat-treating the paraffin preform to remove part of the paraffin to obtain a dewaxing preform; the mass ratio of the nano-titanium particles to the paraffin in the dewaxing preform is 1:0.3-0.8; adding the dewaxing preform into a semi-solid magnesium alloy melt to uniformly stir and mix, so that the paraffin attached to the surface of the nano-titanium particles completely escapes from the melt to obtain a mixed melt; pouring casting after the temperature of the mixed melt is increased by 50-80 DEG C to obtain the nano-titanium reinforced magnesium-based alloy. The disclosed nano-titanium reinforced magnesium-based alloy is prepared by using the above preparation method. The disclosed mechanical equipment is prepared by using the above magnesium-based alloy. The preparation method provided by the application can uniformly disperse the nano-titanium in the magnesium-based alloy, and obtain a composite magnesium-based alloy material with good mechanical properties.

The invention relates to the technical field of plant root secretion, in particular to a nano-material-mediated plant root secretion regulation and control method and salt and alkali resistance application, and the method comprises the following steps: preparation of a modified nano-material agent: adding a modified nano-titanium agent into a carbon nano tube solution with the amount 3-5 times of the total amount of the modified nano-titanium agent, and uniformly stirring, and adding an intervention material accounting for 10-15% of the total amount of the carbon nanotube liquid, and uniformly stirring to obtain the modified nano material agent. According to the nano-material mediated plant root exudate regulation and control method, the modified nano-material agent is prepared by matching the modified nano-material agent with the carbon nano-tube liquid and the intervention material, and meanwhile, soil mixing is adopted for regulation and control treatment; the prepared modified nano titanium agent can better regulate and control plant root exudates in a system.

The application discloses an epoxy resin composition and a preparation method thereof, and the preparation method comprises the following steps: uniformly stirring bisphenol F type epoxy resin, a plasticizer, a stabilizer, a curing agent and a modifier, then adding the mixture into a mold, curing at 90-120 DEG C for 20-50 minutes, then curing at 160-180 DEG C for 0.5-2 hours, and cooling to room temperature to obtain a product; the modifier comprises mica iron oxide; the epoxy resin curing system contains epoxy groups, hydroxyl groups and polar groups such as ether bonds, amine bonds and ester bonds, can not only generate electrostatic attraction with a phase interface, but also can react with free radicals on the surface of a medium to form chemical bonds, and can endow the epoxy curing product with extremely high adhesive strength; in the application, the bisphenol F type epoxy resin EPON862 is used as a base resin, has moderate viscosity, can uniformly disperse the mica iron oxide and nano titanium white powder, and can simultaneously improve the impact strength and near-infrared reflectivity of the product.

The invention relates to the technical field of metal powder for additive manufacturing, and discloses high-temperature alloy powder for additive manufacturing and a preparation method of the high-temperature alloy powder for additive manufacturing. The powder is formed by physically blending nickel-based parent powder and reactive functional powder with a core encapsulation layer structure; the inner core of the reactive functional powder comprises nano aluminum powder, nano titanium powder and a surface tension modifier precursor, and the outer layer of the reactive functional powder is an inorganic matter encapsulation layer. By means of the design, in the laser melting process, the packaging layer plays a role in physical isolation and thermal buffering on high-activity elements in the inner core, and volatilization and burning loss of the high-activity elements are effectively restrained; and meanwhile, controlled release and in-situ reaction of active elements in the molten pool are achieved, a dispersion strengthening phase is promoted to be formed so as to inhibit solidification cracking, and flowing of the molten pool is optimized so as to improve the density of the component. According to the method, the technical problems that in high-strength high-temperature alloy additive manufacturing, cracking is prone to occurring, element burning loss is serious, and the number of metallurgical defects is large are solved, and a high-performance component which is accurate in component, compact in structure and free of macroscopic cracks can be obtained.

The present invention relates to a method for preparing a nano-titanate, a nano-titanic acid and a nano-TiO2 containing doping E or embedding E nanoparticles, and the use thereof. By using an E-doped Ti-T intermetallic compound as a titanium source, and reacting the E-doped Ti-T intermetallic compound with alkaline solution at atmospheric pressure and near its boiling-point temperature, an E-doped titanate nanofilm is prepared at atmospheric pressure with high efficiency and in a short time. Through acid treatment and (or) heat treatment, a titanate nanofilm containing embedding E nanoparticles, an E-doped titanic acid nanofilm, and a titanic acid nanofilm and a TiO2 flake powder containing embedding E nanoparticles can be further prepared. Through a subsequent reaction at high temperature and pressure, the preparation of an E-doped titanate nanotubes and titanic acid nanotubes, and titanic acid nanotubes and TiO2 nanotubes / nanorods containing embedding E nanoparticles can be achieved in high efficiency and low-cost.

The present application relates to the technical field of dielectric ceramic powder preparation, and particularly relates to a multilayer ceramic capacitor and a method for preparing high-performance nano-barium titanate powder used for the multilayer ceramic capacitor, the method comprising the following steps: high-purity titanium hydroxide precursor and solid-state barium source are mixed under the condition of deep cold medium at low temperature, so as to form an amorphous composite precursor with high reactivity, and finally, the nano-barium titanate powder is generated through a hydrothermal synthesis reaction. The present application realizes the forced mixing of the titanium hydroxide precursor and the solid-state barium source at the solid state through the low-temperature cryogenic grinding, so as to physically ensure that the Ba / Ti ratio is highly consistent in each micro area, and the problem of the out-of-control stoichiometric ratio is solved from the source. Meanwhile, the high activation of the precursor shortens the hydrothermal reaction time, greatly reduces the calcination temperature, effectively inhibits the abnormal growth of the crystal grains, and makes the product particle size distribution narrower and the performance better.

The present invention relates to the technical field of a dielectric ceramic powder manufacturing process, and particularly relates to tetragonal nanometer barium titanate powder, a manufacturing method thereof, and an application. The manufacturing method includes: (S.1) manufacturing a mesoporous titanium dioxide precursor with controllable crystal phase, adding it to a barium salt solution so that the molar ratio of barium to titanium is 2 to 4, then adding ethanol and aqueous ammonia to obtain a barium titanate precursor suspension in which the volume ratio of ethanol is 40% to 60%; (S.2) subjecting the barium titanate precursor suspension to a hydrothermal reaction to obtain a barium titanate suspension; and (S.3) centrifugally washing, drying, and pulverizing the barium titanate suspension to obtain tetragonal nanometer barium titanate powder. In the present application, by simultaneously controlling the molar ratio of barium to titanium between the anatase-type mesoporous titanium dioxide precursor and the barium salt in the hydrothermal reaction process and the ratio of ethanol in the hydrothermal medium in the hydrothermal reaction process, barium titanate powder having a higher c / a value and particle size uniformity can be obtained.

The invention relates to the technical field of thermistor materials, in particular to a silicon carbide-based NTC thermistor material and a preparation method thereof. The NTC thermistor material based on silicon carbide is prepared from the following raw materials in percentage by mass: 0.1-0.5 wt% of a fluxing agent, namely nano zinc oxide, 0.05-0.2 wt% of a fluxing agent, namely nano yttrium oxide, 0.4-2.0 wt% of a toughening agent, namely nano zirconium oxide, 0.1-0.5 wt% of a toughening agent, namely nano titanium nitride, 0.4-2.0 wt% of a tempering agent, namely nano strontium titanate, and the balance of silicon carbide. 0.5-4.0% of nano rare earth metal carbide and the balance of silicon carbide. The NTC thermistor material has excellent high temperature resistance and high and low temperature impact resistance, the resistance deviation is lower than 0.5% after 1500 times of cyclic high and low temperature impact, and the NTC thermistor material can meet the use requirements of highly integrated circuits, IGBTs and other modules.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a method for synthesizing nano lithium titanate, which comprises the following steps: mixing an oxalic acid solution with scrapped denitration catalyst powder, and filtering, washing and drying to obtain acid leaching residues after the reaction is finished; alkali liquor and the acid leaching residues are mixed and then react in a closed reaction kettle, and after the reaction is finished, solid titanate powder is obtained through filtering, washing and drying; the method comprises the following steps: heating and mixing an acid solution and solid titanate powder, cooling, filtering, washing and drying to obtain metatitanic acid powder; adding metatitanic acid powder, a lithium source, deionized water and ball milling balls into a ball milling tank, and drying after ball milling to obtain a lithium titanate precursor; and roasting the lithium titanate precursor in air, and grinding to obtain the lithium titanate powder. According to the method, the nano lithium titanate is synthesized by taking metatitanic acid obtained by resource recovery of the waste denitration catalyst as a titanium source, the reaction process speed is high, the product purity is high, the cost can be effectively saved, mining of mineral resources is effectively reduced, energy is saved, carbon is reduced, and the method has the advantages of environmental protection and green development.