160 results about "Dysprosium titanate" patented technology

The invention relates to a method for extracting metal scandium and titanium from red mud; the method is used for extracting scandium and titanium from the red mud; the method takes the red mud which is produced through the sinter process of the high-grade ore two portion of clinker in alumina plant as the raw material; the hydrochloric acid with a concentration of 2 percent to 6 percent is used for leaching the calcium and sodium from the red mud to increase the content of the scandium and titanium in the red mud; and then the hydrochloric acid with a concentration of 16 percent to 22 percent is used for a second acid dipping of the red mud and the product of scandium oxide is obtained after the leaching liquid passes the processes of extraction, reverse extraction and baking; the hydrochloric acid with a concentration of 80 percent to 90 percent is used for a third acid dipping of the red mud after the second one and the leaching liquid is added with iron powder for reduction and then the temperature is reduced to crystallize and separate out iron in the pattern of FeSO<4>.7H<2>O; the acid liquid which contains titanium after the iron is removed is added with alkali and heated for hydrolysis; the product of titanium oxide is obtained after the hydrolysate is baked. The method is simple and easy to be carried out and most metal elements in the red mud can be recovered and the cost for processing the red mud is low, all of which are beneficial to the comprehensive utilization of the red mud.

The invention relates to a class of titanium dioxide photocatalysts, in particular to a low-temperature preparation method of visible light-responsive titanium dioxide transparent aqueous sol doped with metal ions. The titanium inorganic salt and the metal inorganic salt as a dopant are dissolved in water together to form a mixed solution; wherein, the molar ratio of the metal ion in the metal inorganic salt as a dopant to the titanium ion in the titanium inorganic salt is 0.001~ 0.2; then dropwise add inorganic lye until the pH of the mixed solution is about 7-11 to obtain a composite titanic acid precipitate, wash the composite titanic acid precipitate with water and filter, then disperse with hydrogen peroxide aqueous solution, at a temperature of 50-100 Heating at ℃ for 1-24 hours to obtain a transparent aqueous sol of titanium dioxide doped with metal ions. The low-temperature preparation method of the metal ion-doped titanium dioxide transparent water-based sol avoids the problem of environmental pollution, and the obtained sol is transparent, neutral and water-based, and has good photocatalytic effect under visible light.

The invention provides layered perovskite structural ceramic and a preparation method thereof. The preparation method includes mixing well titanate compounds, bismuth compounds, strontium compounds, iron compounds, cobalt compounds and complexing agent in solvent, heating, drying and combusting to obtain powder, and presintering to obtain powder; performing the powder, and performing hot-pressing sintering to obtain the structural ceramic in in a formula (I). Compared with ceramics prepared in the prior art by solid phase sintering process, the structural ceramic in the formula (I) is prepared by solution process and hot pressing sintering. The preparation method has the advantages that less volatile low-valence strontium ions are introduced, increased leakage current due to volatilization of the strontium ions is improved, and ferroelectric properties are improved; the raw materials are evenly spread by the solution process, the power is even in component and has high reactivity, and Fe-Co ions are coupled fully; and the materials processed by hot pressing sintering are high in density and orientation, and the layered perovskite structural material can be obtained, namely Bi(n+1-x)SrxF3(n-3)/2Co(n-3)/2Ti3O3(n+1) (I).

Disclosed is an alumina/aluminum titanate ceramic composite material and a preparation method thereof, relating to a ceramic composite material and a preparation method thereof. The preparation method solves the problems that the preparation process of the present alumina/aluminum titanate ceramic composite material is complicated, the sintering temperature is high, long time is consumed, the density of the product is low, the performance of the product is poor and the aluminum titanate is decomposed easily. The alumina/aluminum titanate ceramic composite material is prepared by mixed powders, deionized water and a binder, wherein, the mixed powders are composed of nanometer alumina and nanometer titanium oxide. The preparation method is as follows: firstly, weighting raw materials, and mixing the materials to obtain a slurry; secondly, re-granulation to the slurry for obtaining a nano-composite powder; thirdly, heat treatment to the nano-composite powder; and fourthly, insulating and sintering the nano-composite powder obtained after the heat treatment to gain the alumina/aluminum titanate ceramic composite material. The preparation method is simple, the sintering temperature is low, short time is consumed, aluminum titanate in the product is not decomposed, the density of the product is high and the performance of the product is good.

A process for preparing a powder of aluminum titanate, including the steps of subjecting to pressure molding a mixture of 100 parts by weight of a mixture of Al2O3 and TiO2 at a molar ratio of the former: the latter of 1:0.95-1.05, 2 to 5 parts by weight of SiO2, 2 to 5 parts by weight of iron oxide calculated as Fe2O3 and 1 to 3 parts by weight of a powder of an organic substance; sintering the molded product at a temperature of 1600 to 1700° C. in a closed container; and pulverizing the molded product. A further process for preparing a sintered body of aluminum titanate includes the steps of molding the powder of aluminum titanate obtained by the above-mentioned process and sintering the molded product at 1450 to 1550° C.

The invention belongs to the field of luminescent materials, and discloses a calcium titanate luminescent material and a preparation method thereof. The chemical general formula of the calcium titanate luminescent material is Ca1-xTi1-yO3: xPr, yR, M, wherein 0.001<=x<=0.01, 0.005<=y<=0.03, R refers to at least one of Al and Ga, and M refers to at least one of nano particles of Ag, Au, Pt and Pd. The calcium titanate luminescent material is simple in preparation process, low in equipment requirement and short in preparation period. A small quantity of metallic nano particles is added into the luminescent material to enhance luminescence of the luminescent material, and the luminous intensity can be enhanced under excitation of cathode rays.

The invention discloses a method for preparing a nanometer titania coated graphite cathode material. The method comprises the steps that A, graphite is added into a mixed solution of glacial acetic acid, water and absolute ethyl alcohol at room temperature under the stirring condition, the materials are fully mixed, and a mixture is obtained; B, a titanate and absolute ethyl alcohol mixed solution is dropwise added into the mixture obtained in the step A within a certain time at room temperature under the stirring condition, standing is carried out for several hours, drying is carried out, and metatitanic acid gel coated powdered graphite is obtained; C, the metatitanic acid gel coated powdered graphite obtained in the step B is placed in a program temperature control furnace, the temperature is raised to 350 DEG C to 850 DEG C at a certain heating rate, the constant temperature is kept for several hours under the vacuum condition, the product is naturally cooled to room temperature, and the anatase and rutile type nanometer titania coated graphite material is obtained. The grain size of the nanometer titania coated graphite cathode material ranges from 1 micrometer to 35 micrometers, and high specific discharge capacity, good cycle performance and high high-rate charge and discharge performance are achieved.

The invention discloses a titanium dioxide/lead titanate compounded nanometer photocatalyst and a preparation method thereof. The titanium dioxide/lead titanate compounded nanometer photocatalyst is a heterogeneous structure material formed by distributing titanium dioxide nano particles on the surface of lead titanate nano sheets. The preparation method comprises the following steps of dispersing lead titanate nano sheets synthetized through a hydrothermal method into deionized water; preparing a titanium source water solution; and dropwise adding the titanium source water solution into the lead titanate nano sheet water solution, then transferring into a hydrothermal reaction kettle, after hydrothermal reaction, cooling to room temperature, filtering, washing, and drying. The preparation method is simple and easy to control, and has low requirement on equipment; and the prepared titanium dioxide/lead titanate compounded nanometer photocatalyst can be used for regulating the ultraviolet light catalysis of the titanium dioxide into visible light catalysis.

The invention relates to a preparation method of a perovskite phase lead titanate-strontium titanate monocrystal nanometer material with a core-shell structure. The preparation method comprises the steps of taking a monocrystal single-domain perovskite phase lead titanate nanosheet as a template and a raw material, taking tetrabutyl titanate as a titanium source, taking strontium nitrate as a strontium source, taking sodium hydroxide as a precipitant and a mineralizing agent, and preparing precursor mixed turbid liquid for a hydrothermal reaction under the condition of magnetic stirring; sealing the precursor mixed turbid liquid into a stainless steel reaction still having a teflon liner, and obtaining a core-shell structure perovskite phase lead titanate-strontium titanate monocrystal nanometer composite structure through subjecting to hydro-thermal treatment at the temperature of 160 to 220 DEG C for 4 to 24 hours. The preparation method provided by the invention is simple in technical process, easy to control, free of pollution, low in cost, and easy for mass production. The prepared perovskite phase lead titanate-strontium titanate monocrystal nanometer composite structure has a clear core-shell structure, and has an interface with atomic resolution.

The invention belongs to a method for preparing high-strength aluminum titanate ceramic, which comprises the steps: (1) material distribution; (2) ball milling; (3) drying; (4) granulation; (5) molding by semidry pressing; (6) measurement and sintering; and (7) testing. The method accelerates the sintering by adding an appropriate additive, greatly improves the sintering property of aluminum titanate, inhibits the decomposition of the aluminum titanate, and ensures that the aluminum titanate has the characteristics of excellent thermal shock resistance and thermal impact resistance and so on, thereby ensuring that the aluminum titanate ceramic is practically applied and can be widely applied to industrial production.

The invention relates to a preparation method of nano dysprosium titanate powder. The method comprises the steps of dropping alcohol/water/glacial acetic acid mixed solution containing dysprosium nitrate into titanium acid butyl ester alcohol solution according to the molar ratio of Dy:Ti=(1-2:1); ageing obtained colloidal sol at the room temperature so as to obtain gel; drying and crushing the gel, arranging the gel into an aluminum oxide crucible, sintering the gel at 8001100 DEG C so as to obtain the nano dysprosium titanate powder. The nano dysprosium titanate powder preparation process is simple, the grain size of the powder is even and small, and the purity is high; and the powder can be used as neutron absorbing materials.

The invention relates to a convenient and fast method for preparation of high-catalytic activity Ti-based electrodes, Ti/nanoTiO2-RE2O3 and Ti/nanoTiO2-ZrO2, and a related key problem in the method is preparation of a modification material having high catalytic activity and stability. According to the invention, the process of sacrificial anodes is adopted, an inert electrode is used as a cathode, metallic Ti is used as a sacrificial anode, and a small amount of tetrabutylammonium bromide (Bu4NBr) is added into anhydrous ethanol as a conductive salt; ethyl titanate (Ti(OEt)4), a precursor of TiO2, is prepared through electrolysis; salt compounds of rare earth metals and zirconium metal are respectively added into ethyl titanate, and ethyl titanate is directly subjected to hydrolysis so as to respectively obtain rare earth metal doped composite nanometer TiO2 sol and zirconium metal doped composite nanometer TiO2 sol; pure titanium metal is used, the rare earth metal doped composite nanometer TiO2 sol and the zirconium metal doped composite nanometer TiO2 sol are respectively coated on Ti substrates having clean surfaces by using the Czochralski method, and electrodes modified by films doped with different metal oxides, i.e., Ti/nanoTiO2-RE2O3 and Ti/nanoTiO2-ZrO2 electrodes, are prepared after calcination.

The invention relates to a method for preparing high dielectric, low-loss and insulating calcium copper titanate ceramics, belonging to the technical field of high dielectric ceramic materials. The calcium copper titanate ceramics are prepared from initial raw materials of CaCO3 or CaO, CuO and TiO2, wherein after being mixed, the raw materials are processed by mix grinding and then processed by presintering at the temperature from 800 DEG C to 950 DEG C after mix grinding, hard blocks after presintering are cracked to be ground, and the powdered materials after presintering and grinding are prepared into green bodies with predetermined shapes; and the green bodies are heated to the sintering temperature ranging from 960 DEG C to 990 DEG C from room temperature, and heat preservation is carried out for 1 to 24 hours at the sintering temperature, thereby realizing the sintering densification of the ceramics. The preparation method controls performance parameters by controlling technological parameters, and structural changes and chemical reactions in a sintering process. The ceramic materials prepared by the method can meet the requirement on industrial application; and simultaneously, compared with the prior art, the preparation method can obviously reduce the energy consumption, is environment-friendly and reduces the production cost.

The invention discloses a preparation method of a cathode slurry for an aquo-lithium titanate dynamical type battery. The method comprises the following steps: first, weighting raw materials according to the following mass percentage: 1-13% of a conductive agent, 1-5% of a dispersant sodium carboxymethyl cellulose, 2-5% of a binder styrene-butadiene latex, 81-93% of an active substance lithium titanate and water accounting for 50-65% of the total weight of the above materials; after the weighing, adding the dispersant sodium carboxymethyl cellulose into water, stirring for 2-6 h and shelving for 20-24h to obtain a sodium carboxymethyl cellulose mother liquor; then adding the conductive agent into the sodium carboxymethyl cellulose mother liquor, and stirring for 2-3 h; adding the active substance lithium titanate, stirring for 3-4 h, and adjusting viscosity; and finally adding the styrene-butadiene latex and stirring for 1-1.5h in vacuum to obtain the slurry. According to the invention, traditional PVDF is substituted by styrene-butadiene latex, so as to realize application of water-based binder as the cathode in lithium titanate; the invention has the advantages of no toxicity or pollution; besides, the aqueous binder solves the phenomenon of plate shedding caused by water absorption.

The method comprises: coating a 0.01-10000 mu m thick zinc oxide sacrificial layer on the baseplate; using the photo etching and corrosion technology to pattern the sacrificial material; at the area where the PZT film will be reserved, the sacrificial layer will be etched; at the area where the PZT film will be stripped, the sacrificial layer will be reserved; after patterning, the PZT film is be coated on the sacrificial material; releasing the sacrificial layer; expose the PZT film pattern.

The invention relates to a low-temperature sintered zinc titanate high-frequency dielectric ceramic and preparation method, wherein the ceramic comprises zinc oxide produced by decomposing one portion of basic zinc carbonate, one portion of anatase nano-TiO2 and 0.75-1.00 wt% of vanadium pentoxide and diboron trioxide additive, wherein the basic zinc carbonate is used for producing zinc oxide, the preparation comprises ball grinding, drying, grinding, forming, pre-calcination, sintering and silvering.

The invention relates to a self-assembly method of a photocatalyst material, and relates to a self-assembly method of a precious metal quantum dot/one-dimensional titanate nanoribbon heterojunction material, which is characterized by comprising the following steps of: (1) preparing a phosphonic acid surfactant solution with the concentration of not less than 10mg/mL; (2) obtaining the one-dimensional titanate nanoribbon processed with a phosphonic acid surfactant according to the mass ratio of the one-dimensional titanate nanoribbon to the phosphonic acid surfactant solution being 1:1-1:10; (3) preparing a precious metal quantum dot solution with the concentration of not less than 10mg/mL according to the mass ratio of the precious metal quantum dot to the one-dimensional titanate nanoribbon being 0.1-12 percent; (4) immersing the one-dimensional titanate nanoribbon processed with the phosphonic acid surfactant in the precious metal quantum dot solution to obtain the precious metal quantum dot/one-dimensional titanate nanoribbon heterojunction material with different precious metal contents in a self-assembly mode. The method has simple process and low cost. Moreover, the obtainedphotocatalyst material has prominent photocatalytic enhancement effect.

The invention discloses a method adopting sol-gel technique to prepare aluminum titanate film. The method comprises the steps as follows: adopting aluminum nitrate as the aluminium source, inducting titanium through titanium alkoxide or titanium tetrachloride, utilizing lower alcohol as the solvent, and applying acetylacetone, acetic acid or glycol as the stabilizer to control the hydrolyzing speed of the titanium precursor, wherein, the PH value is adjusted by nitric acid; the aluminum titanate sol is prepared by utilizing glycerin, butanediol or formamide as the dryness control chemical additive; after aging and vacuum defoaming of the sol, the dipping lifting method is adopted to coat film, and the film is processed by room temperature aging, room temperature drying and drying under 50 DEG C to get dry gel film. The film can be coated repeatedly till the necessary thickness of film. Before repeated coating, a low temperature calcine disposal of 450 DEG C is necessary, and finally the even and compact aluminum titanate film is formed by calcinations under 1350 DEG C. The invention has the advantages of simple process, low cost of raw material, etc.

The invention relates to a method for preparing a ferroelectric single crystal lead indium niobate-lead titanate, and belongs to the field of crystal growth. The preparation method comprises the following steps of: mixing raw materials, dissolving, growing, and the like, namely a PIN-PT crystal is successfully grown by a top seeded solution growth (TSSG) method. The structure and ferroelectric, dielectric and piezoelectric properties of the crystal are analyzed through X-ray powder diffraction and ferroelectric, dielectric and piezoelectric measurement. Preferably, the 0.655PIN-0.345PT crystal has high Curie temperature and rhombohedral-tetragonal phase change temperature, high piezoelectric property and electromechanical coupling property and a wide application prospect. The method is convenient to operate and suitable for batch growth, equipment is simple, and a high-quality large-size PIN-PT crystal can be stably provided.

The invention relates to a ternary ferroelectric solid solution lead niobate ytterbate-lead zinc niobate-lead titanate. The chemical formula of the solid solution is xPb(Yb1/2Nb1/2)O3-yPb(Zn1/3Nb2/3)O3-(1-x-y)PbTiO3, wherein x is more than 0 and less than 1, and y is more than 0 and less than 1, and the solid solution belongs to a typical composite perovskite structure. The system is good in piezoelectric and electromechanical performance, high in Curie temperature and good in thermal stability, and has a wide application prospect.

The invention discloses a sodium-ion battery nickel titanate cathode material and a preparation method thereof. The nickel titanate material has a loose and porous structure and a disc-shaped micro-structure, and has low potential, high specificity and excellent circulation performance when used as a sodium-ion battery cathode material. The preparation method of the sodium-ion battery nickel titanate cathode material is simple, cost is low, and wide industrial application prospects are achieved.