304results about "Zirconium oxides" patented technology

This invention discloses a method for preparing high-purity zirconium oxide, belonging to the field of compound preparation technology. The method provides a breakthrough adjustment of the final concentration state and the cooling process after concentration and evaporation of an acidic zirconium oxychloride solution under the action of an oxidant. Simultaneously, crystallization is achieved through a two-stage concentration and evaporation process, followed by calcination to obtain hafnium-free zirconium oxide. The resulting zirconium oxide not only has a high yield but also high purity. Furthermore, the technical solution of this invention avoids the generation of ammonia nitrogen wastewater as in existing technologies, thus not only avoiding environmental impact but also significantly reducing production costs through the recycling of hydrochloric acid condensation, achieving a green and environmentally friendly effect.

The invention provides a coated modified lithium cobalt oxide material, a preparation method thereof, a positive electrode and a lithium ion battery. The preparation method comprises the following steps: providing a mixture, wherein the mixture sequentially comprises first lithium cobalt oxide particles, a coating agent and second lithium cobalt oxide particles from bottom to top; sequentially carrying out first mixing, second mixing and third mixing on the mixture; and sintering to obtain the coated modified lithium cobalt oxide material. The D50 particle size of the first lithium cobalt oxide particles is larger than that of the second lithium cobalt oxide particles; the mixing rotating speeds of the first mixing, the second mixing and the third mixing are sequentially increased. In the lithium cobalt oxide coating modification process, the positions of the first lithium cobalt oxide particles, the second lithium cobalt oxide particles and the coating agent in the mixture in the vertical direction are designed to form a sandwich structure, and a three-stage mixing process is combined, so that the mixing uniformity of the coating agent and the lithium cobalt oxide material is remarkably improved, and the coating performance of the lithium cobalt oxide material is improved. And uniform coating of the coating element on the surface of the lithium cobalt oxide material is realized.

The invention provides a PDA-ZrO2 coated zinc anode, a preparation method thereof and a battery, and belongs to the technical field of electrochemical energy storage materials. According to the zinc anode, a polydopamine-zirconium dioxide composite protective layer is constructed on the surface of a zinc substrate. According to the composite layer, a polydopamine bottom layer is formed through self-polymerization of dopamine on the surface of the zinc foil, and then a zirconium dioxide layer is introduced on the polydopamine bottom layer through an in-situ mineralization method. The PDA-ZrO2 composite layer disclosed by the invention has the main advantages that the PDA-ZrO2 composite layer ingeniously combines the strong adhesive force, excellent flexibility and ion regulation and control capability of polydopamine and the high mechanical strength and chemical stability of zirconium dioxide. The synergistic effect of'soft and hard combination 'can effectively homogenize zinc ion flow, inhibit dendritic crystal growth and block side reaction caused by water molecules, so that the interface stability of the zinc metal anode is remarkably improved, and the cycle life of the zinc metal anode is remarkably prolonged. The preparation method is simple in process, mild in condition and easy for large-scale production.

The invention discloses a method for preparing hafnium oxide from hafnium oxalate feed liquid through an oxidation precipitation method, and belongs to the technical field of hydrometallurgy. The specific method comprises the following steps: adding an oxidizing agent into hafnium oxalate feed liquid to destroy oxalate ions in hafnium oxalate so as to enable hafnium to form hydroxide precipitates; and separating the generated white precipitate, and roasting at high temperature to obtain hafnium oxide. The strong oxidant used in the method is low in cost, high in precipitation efficiency, green, environmentally friendly, free of large pollution to equipment and the environment and wide in application range. The method is simple in process, does not involve a complex process flow, does not need precise equipment, avoids a large amount of alkali liquor required by metal ion precipitation, is simpler in process flow, higher in efficiency and lower in cost, avoids the generation of a large amount of wastewater, and is very environment-friendly. And meanwhile, the process is wide in application range and suitable for various oxalic acid metal feed liquid.

The invention discloses a preparation method of a bifunctional heterojunction catalyst for AEM electrolyzed water. The method comprises the following steps: step 1, mixing multi-walled carbon nanotubes, deionized water, absolute ethyl alcohol and inorganic acid; step 2, putting the mixed solution in the step 1 into an ultrasonic machine to form a porous structure and more active adsorption sites; step 3, carrying out freeze drying treatment on the mixed solution treated in the step 2; step 4, mixing the dried multi-walled carbon nanotubes with acetylacetone salt, and uniformly grinding the mixed powder; and step 5, putting the powder obtained in the step 4 into a tubular furnace, and carrying out heat treatment in the atmosphere of H2 / Ar to obtain the PtFeCoNiMoZr / ZrO heterojunction catalyst. The catalyst has a remarkable catalytic effect on HER and OER reactions, and meanwhile, stable electrolysis which stably runs for 200 hours in an AEM electrolytic cell under the current density of 1200 mA / cm < 2 > is successfully realized.

A ZrO2 dispersion liquid containing, a ZrO2 particle coated with a silane coupling agent, and a dispersion medium for the ZrO2 particle, wherein a BET specific surface area of the ZrO2 particle coated with the silane coupling agent obtained by removing the dispersion medium is 36% or more of a BET specific surface area of the ZrO2 particle before coating with the silane coupling agent.

This invention provides a zirconia-based porous body having a pore diameter suitable for supporting catalytic active species, such as precious metals, small variability in pore diameter, and a sufficient specific surface area even after 12-hour heating at 1000°C. Specifically, the invention provides a zirconia-based porous body in particle form having (1) a pore diameter peak at 20 to 100 nm in the pore distribution by BJH method, a P / W ratio of 0.05 or more wherein W represents half width of the peak and P represents height of the peak in the measured pore distribution curve, and a total pore volume of 0.5 cm3 / g or more; and (2) a pore diameter peak at 20 to 100 nm, the P / W ratio of 0.03 or more, a specific surface area of at least 40 m2 / g, and a total pore volume of 0.3 cm3 / g or more, after heat treatment at 1000°C for 12 hours.

Provided is at least one of: a powder capable of providing zirconia sintered bodies that contain manganese as a main coloring element, assume a black color, have high fracture toughness, and exhibit only a small variation in color tone due to different sintering temperatures; and a method for producing the powder. The powder of the present disclosure is a powder containing zirconia containing yttrium as a stabilizing element, a manganese compound and alumina. The content of the stabilizing element in terms of oxide is 1.3 mol% or more and less than 2.0 mol% based on the total amount of the zirconia and the stabilizing element in terms of oxide. The content of the alumina is 0.2% by mass or more and 1.5% by mass or less based on the total mass of the powder, and the content of the manganese compound is 0.1 % by mass or more and 0.6% by mass or less based on the total mass of the powder.

Disclosed is a ceramic reversible cell which contains at least one substance selected from the group consisting of perovskite type metal oxides, hydrates of the perovskite type metal oxides, and hydrides of the perovskite type metal oxides, wherein: the at least one substance selected from the group consisting of perovskite type metal oxides, hydrates of the perovskite type metal oxides, and hydrides of the perovskite type metal oxides contains A (wherein A is at least one element selected from the group consisting of Ba, Sr and Ca), B (wherein B is at least one element selected from the group consisting of Zr, Sn, Ce, Ti and Hf) and M (wherein M is at least one element selected from the group consisting of In, Fe, Cr and Mn) as main metal atoms; and hydride ions are contained therein when equilibrium is reached by bringing dried hydrogen into contact with the ceramic reversible cell, the dried hydrogen satisfying a specific formula and having a moisture content of 20 ppm or less in terms of volume ratio at 500°C to 900°C.

Provided are: a method for producing a proton-containing oxide, the method comprising reacting a basic oxide with a carboxylic acid melt having at least pKa4 and introducing a proton into the basic oxide to obtain a proton-containing oxide; a dense body of a proton-containing basic composite oxide; a fuel cell; a hydrogen production cell; a hydrogen sensor; or an ammonia synthesis cell; and methods for producing the same.

To provide at least any of a zirconia sintered body of a solid solution of titanium and yttrium with fracture being difficult to propagate as compared to a zirconia sintered body of a solid solution of titanium and yttrium showing transparency and also showing transparency, a manufacturing method thereof, and use thereof.SOLUTION: A zirconia sintered body of a solid solution of titanium and yttrium has a content of yttrium of 3.5 mol% or over and under 6.0 mol%, a content of titanium of 6.0 mol% or over and 18.5 mol% or under, a straight transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm of 45% or over, a ratio of a straight transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm to a total light transmittance at a sample thickness of 1±0.1 mm and a measurement wavelength of 600 nm of 0.70 or over, and a fracture toughness value (KIC) of 1.5 MPa m0.5 or over.SELECTED DRAWING: Figure 1

The application discloses a preparation method of single tetragonal phase zirconia stable at high temperature and ultrahigh temperature. 10 H 14 N2Na2O8 or C 10 H 12 N2Na4O8 as a reaction chelating agent, low-temperature water bath is used to prepare single tetragonal phase zirconia precursor powder, and finally single tetragonal phase zirconia is prepared after high-temperature and ultrahigh-temperature calcination; the application mainly uses common inorganic salts and simple chelating agents, is low in cost, simple and easy to operate, good in repeatability, green and safe, suitable for large-scale production, and can realize that the prepared product is single tetragonal phase zirconia after high-temperature and ultrahigh-temperature calcination, and realizes that the tetragonal phase is stable in a high-temperature and ultrahigh-temperature temperature range.

A heavy metal pollution-resistant catalyst and its preparation method. The catalyst comprises, on a dry basis, 10-70% by weight of a cracking-active component, 1-20% by weight of a zirconium oxide binder, 1-20% by weight of a silica sol binder, 0-50% of an alumina-based binder, and 10-70% by weight of clay. The catalyst preparation method comprises slurrying the cracking-active component, binder, and clay, followed by spray drying. The catalyst is used in heavy oil catalytic cracking reactions and exhibits excellent resistance to metal pollution while achieving a high heavy oil conversion rate.

To provide a liquid composition for forming a BCTZ film, which can control the crystal particle size and form a BCTZ film with stable properties, a method for producing the liquid composition for forming a BCTZ film, and a BCTZ film, and a method for producing the BCTZ film.SOLUTION: A liquid composition for forming a BCTZ film is provided, in which barium carboxylate, calcium carboxylate, a titanium alkoxide and a zirconium alkoxide are mixed in an organic solvent in a molar ratio of Ba:Ca:Ti:Zr=(1-X):X:(1-Y):Y (0.03≤X≤0.20, 0.05≤Y≤0.25) and a stabilizer is added. The barium carboxylate and calcium carboxylate are metal salts of carboxylic acids represented by the general formula CnH2n+1COOH (5≤n≤7). The organic solvent is a mixed solvent containing a carboxylic acid and an acetate.SELECTED DRAWING: None

The present invention provides a method for producing an inorganic particle-containing slurry, by which the number of coarse particles can be sufficiently reduced. The present invention is a method for producing an inorganic particle-containing slurry, which comprises: a step of preparing an inorganic particle dispersion containing inorganic particles and a dispersing medium, and having a pH less than the isoelectric point of the inorganic particles; and a step of adding an alkaline compound to the inorganic particle dispersion in such a manner that the pH does not reach the isoelectric point of the inorganic particles.

A method for simply preparing a high-refractive-index transparent nano-zirconia dispersion. A zirconium salt solution is weighed and then directly poured into water or an organic solvent or a mixed solution of water and an organic solvent, and nano-zirconia particles are directly obtained by means of a hydrothermal method and are washed, so as to obtain a nano-zirconia liquid-phase dispersion. The method comprises simpler steps and does not need other complicated procedures. The refractive index of the obtained nano-zirconia liquid-phase dispersion is about 1.7-1.8, and is improved, thereby improving the light transmission of the zirconia dispersion during the production of a downstream product, and facilitating the processing of a downstream procedure.

The invention relates to a process for producing lithium zirconium mixed oxides by means of flame spray pyrolysis, mixed oxides obtainable by this process and their use in lithium ion batteries.

The invention discloses a preparation process of a nanometer photorefractive crystal electronic material, and the preparation process specifically comprises the following steps: S1, synthesis of a refractive crystal precursor material, S2, synthesis of a refractive crystal material, S3, modification of the refractive crystal material, and S4, dispersion of the refractive crystal material.The invention relates to the technical field of preparation of nanometer photorefractive crystal materials. According to the preparation process of the nano photorefractive crystal electronic material, nano ZrO2 is synthesized by adopting an oil system route, so that zirconium oxide with the range of 5-15 nanometers is synthesized, the defects that a tetragonal phase configuration cannot be obtained and the particle size is small in an existing water system route are overcome, and pilot scale production can be carried out by adopting the process disclosed by the invention. Compared with an existing competitive product, the high-refractive-index composite resin prepared through the method is more excellent in optical performance, such as transmittance, and the high-refractive-index composite resin is better than the competitive product.

A positive electrode active material comprises secondary particles, wherein each of the secondary particles includes primary particles, and each of the primary particles includes an olivine-type phosphate compound and lithium zirconate.

A sintered body that includes zirconia containing a stabilizing element; and a plastic deformation region, wherein the stabilizing element includes at least one rare-earth element other than yttrium, and the stabilizing element content is 1.5% or more by mole and less than 3.0% by mole.

This invention discloses a system and control method for supercritical hydrothermal and solvothermal synthesis of nano-zirconia, including a material conveying system, a mixing reaction unit, a post-processing unit, and an emergency tank unit. The entire system can achieve quality control, precise temperature and pressure control, large flow rate system control, and safety control in supercritical hydrothermal / solvothermal synthesis of nano-composite zirconia. It solves key problems such as rapid heating and pressurization and cooling and depressurization, safe and reliable operation, and quality control in supercritical hydrothermal / solvothermal synthesis of nano-composite zirconia systems, and achieves system optimization, laying the foundation for the industrialization of continuous supercritical hydrothermal / solvothermal synthesis.

A dispersion for polishing containing a zirconium oxide and a polishing aid, wherein the zirconium oxide comprises a monoclinic phase and has a ratio of crystallite size of a monoclinic (-111) side to a monoclinic (111) side ((-111) side / (111) side) of from 0.50 to 0.95. The dispersion for polishing and the powder for polishing of the present invention can be used in a chemical mechanical polishing (CMP) such as a SiC wafer, and can be utilized in a production process of a semiconductor and the like.

Provided are a composite oxide powder from which dense solid electrolyte objects having a high ion conductivity can be produced and a method for producing the composite oxide powder. The composite oxide powder is composed of particles comprising lithium (Li), lanthanum (La), zirconium (Zr), and oxygen (O) and having a cubic garnet-type crystal structure, and has a volume particle size distribution in which the 50% diameter (D50) is 1,000 nm or smaller, the composite oxide powder having a pyrochlore phase content of 10 mass % or less.

To provide at least one out of powders, a manufacturing method thereof, a calcined body obtained from the powders, a sintered body, and manufacturing methods for them; the powders including zirconia as a principal component and at least a transition metal element, and from which a calcined body being able to be obtained, the calcined body having mechanical characteristics more suitable for calcination processing.SOLUTION: Powders of zirconia include a stabilizing element and a transition metal element, where a difference between a minimum value and a maximum value of transition metal element / zirconium is less than 0.25 in a frequency distribution of element ratio in which the transition metal element / zirconium is plotted at 0.005 intervals.SELECTED DRAWING: Figure 4

Core-shell support, comprising: a core comprising at least one oxygen storage / release material selected from alumina-doped ceria-zirconia-based solid solutions; and a shell comprising a rare earth zirconium oxide-based composite oxide represented by a composition formula: (R 1-x Ce x )2Zr2O 7+x , where R represents a rare earth element which is at least one element selected from the group consisting of La, Nd, Pr, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc and Y, and x represents a number from 0.0 to 0.8, and with which an outer side of the core is coated, wherein the rare earth zirconium oxide-based composite oxide contains crystal particles having a pyrochlore structure, and the composite oxide based on rare earth zirconium oxide has an average crystal diameter of 3 to 9 nm, wherein an amount of the rare earth zirconium oxide-based composite oxide forming the shell is 4 to 24 parts by mass based on 100 parts by mass of the at least one oxygen storage / release material forming the core.

The invention relates to a preparation method for synthesizing nano zirconium oxide with a self-assembled hollow spherical shell structure. According to the method, a zirconium oxynitrate (ZrO (NO3) 2) aqueous solution is adopted as a precursor solution, and ZrO2 is synthesized by adopting a premixed flame stagnation method and adjusting the premixed gas flow. Wherein the premixed gas comprises carrier gas, combustion gas and combustion-supporting gas, the precursor solution, the combustion gas and the combustion-supporting gas are mixed to form the premixed gas through the carrier gas, and a high-temperature stable plane flame field is formed after ignition is conducted at a burner nozzle. The precursor solution is subjected to a gasification-pyrolysis-oxidation reaction sequence when passing through a flame area at a high speed, and nucleation control is realized through gas phase collision. In a steep temperature gradient field established between a flame area and a water-cooled substrate, a huge thermophoresis force drives newly generated nuclear particles to directionally deposit. And finally, carrying out annealing treatment on the collected primary product to obtain the nano ZrO2 material with the hollow core-shell structure. According to the method, the high efficiency of flame synthesis and the directional assembly characteristic of thermophoresis deposition are combined, and one-step forming of the hollow nanostructure is achieved.

A dispersion liquid for polishing, which contains zirconium oxide and a polishing aid, and wherein the zirconium oxide contains a monoclinic crystal phase and the ratio of the crystallite diameter of the monoclinic crystal (-111) plane to the crystallite diameter of the monoclinic crystal (111) plane ((-111) plane / (111) plane) is 0.50-0.95. This polishing dispersion liquid and polishing powder can be used in chemical mechanical polishing (CMP) of SiC wafers or the like, and can be used in a semiconductor manufacturing process or the like.

The embodiments of this specification provide a zirconia powder production device, method, system, and medium. The device includes a batcher for batching raw materials based on the production raw material ratio to obtain the production raw materials of zirconia powder; a reactor including a first container and a second container, wherein the first volume of the first container meets the volume range condition and the second volume of the second container is greater than a preset volume threshold, and the reactor is used to process the production raw materials in the first container and the second container in sequence to obtain a reaction slurry; a filter press washer for performing filter press washing on the reaction slurry to obtain a slurry cake that meets the first preset condition; a calciner for calcining the slurry cake to obtain a precursor powder; a pulverizer for pulverizing the precursor powder to obtain zirconia powder; and a processor for determining the production raw material ratio of zirconia powder based on the finished product requirement parameters of the zirconia powder and sending it to the batcher.

Provided is at least one of a method for producing easily grindable recycled zirconia from a zirconia sintered body and a method for recycling a zirconia sintered body, by which method the zirconia sintered body can be recycled. A method for producing recycled zirconia includes an ammonia treatment step of subjecting a zirconia sintered body to a heat treatment in an oxygen-containing ammonia atmosphere at a temperature of 800°C or higher and 1200°C or lower. The ammonia treatment step satisfies at least one of a condition (a) below and a condition (b) below. (a) The oxygen-containing ammonia atmosphere has an oxygen concentration of 0.3 vol% or more. (b) The oxygen-containing ammonia atmosphere has an oxygen concentration of 0.2 vol% or more, and the zirconia sintered body has a cubic phase ratio of 3.5% or more.

Provided are at least one of: a method for recycling a zirconia sintered body, which is capable of regenerating a zirconia sintered body that is difficult to be pulverized by pulverizing; a powder obtained thereby; and a use thereof. A powder of zirconia comprising grains. Such a powder is preferably obtained by a production method comprising: a hydrothermal treatment step in which a sintered zirconia body is subjected to hydrothermal treatment at a hydrothermal treatment temperature of 150-400 DEG C (inclusive) with the mass ratio of water to the sintered body being 1.5 or less; and a crushing step in which the sintered body after the hydrothermal treatment is crushed.