105results about "Yittrium oxides/hydroxides" patented technology

The invention belongs to the technical field of preparation of electrocatalytic oxygen evolution catalysts, and particularly discloses a doping regulation type ruthenium-iridium-based electrocatalytic oxygen evolution catalyst and a preparation method thereof.The preparation method comprises the following steps that S1, ruthenium salt, iridium salt and doped metal salt are dispersed in a solvent, the doped metal salt is selected from one or more of yttrium salt, strontium salt, potassium salt, calcium salt, magnesium salt, scandium salt, gallium salt and aluminum salt; s2, preparing a precursor mixture; s3, performing heat treatment to obtain a solid product; and S4, washing and drying to obtain the metal element doped ruthenium-iridium-based electro-catalytic oxygen evolution catalyst. According to the doping regulation type ruthenium-iridium-based electro-catalysis oxygen evolution catalyst and the preparation method thereof, the process is simple, the universality is high, doping of multiple elements can be achieved only by replacing the doped metal salt, and the obtained catalyst has excellent acidic water electrolysis oxygen evolution activity and long circulation stability; and excessive phase splitting of the Y element and excessive lattice distortion of other elements can be avoided.

Disclosed is a chamber component of a processing chamber, the chamber component comprising a body and a coating on at least one surface of the body. The coating comprises about 89 mol % to about 93 mol % Y2O3 and about 7 mol % to about 11 mol % ZrO2. The coating has a hardness of about 1-50 GPa.

The application discloses a kind of red mud gradient depth purification-rare earth-radioactivity synergistic target purification method, by " hierarchical pretreatment and microwave modification→three-stage gradient dealkalization→rare earth-radioactivity synergistic target purification→full quantization recycling" four-stage integrated process, realize red mud harmless and high-value utilization.The three-stage gradient dealkalization uses microwave-CO2-biological synergic system, after dealkalization pH≤8.0, Na2O content<1%;Rare earth-radioactivity purification is extracted by HDES and coupled with multi-ligand magnetic material system, light rare earth recovery rate≥95%, middle heavy / rare earth recovery rate≥90%, U / Th removal rate≥95%;Full quantization recycling realizes red mud total utilization rate≥98.5%, wastewater reuse rate≥95%, every ton of red mud fixed CO2≥0.2 tons.The application is suitable for various high-alkali, containing radioactive and rare earth red mud treatment, with environmental benefits and economic benefits.

Provided is an yttrium-based protective film having excellent plasma resistance and appearance.　The yttrium-based protective film provided herein contains an yttrium oxide, has a porosity of less than 0.5 vol% and a Vickers hardness of at least 800 HV. The yttrium-based protective film preferably has a thickness of at least 0.3 μm, a crystallite size of at most 40 nm, a Y2O3 (222) plane orientation of at least 50%, a hydrogen atom number of at most 5.0×1021 / cm3, and a compressive stress of 100-1,700 MPa.

The present invention relates to a composition comprising monodisperse spherical rare-earth oxide particles having an average particle size of about 20 nm to about 300 nm. The rare-earth oxide particles in this composition have a diameter D of a calculated particle size in nanometers, which can be determined by the following formula. JPEG2026509615000020.jpg16166 Here, SSA is m 2 BET specific surface area in units of / g, ρ is g / cm² 3 The density is per unit area, and the difference from the diameter of the observed particle size measured by SEM is less than approximately 25%. The rare earth particles may be Dy2O3, Ho2O3, La2O3, and Y2O3 particles. This composition has properties beneficial for ceramic and electronic applications. Furthermore, the present invention includes a manufacturing process for these particles and applications for these particles.

A composition includes monodispersed spherical rare earth oxide particles having an average particle size of from about 20 nm to about 300 nm. The rare earth oxide particles of this composition have a particle size diameter D calculated in nm of the following formula (I) wherein SSA is a BET specific surface area in m2 / g and rho is a density in g / cm3 which differs by less than about 25% from the particle size diameter observed by SEM. The rare earth particles may be Dy2O3, Ho2O3, Y2O3, and La2O3 particles. Such compositions have beneficial properties for ceramic and electronic applications. Methods for preparing these particles and uses of these particles are also included. (I)

The nanopowder includes a nanoparticle having a core particle with a thin film coating. The core particle is formed independently of the thin film coating from at least one of a rare earth metal-containing oxide, a rare earth metal-containing fluoride, a rare earth metal-containing oxyfluoride, or a combination thereof. Thin film coatings may be formed using non-direct vision techniques such as atomic layer deposition (ALD). Also disclosed herein are nanoceramic materials formed from the nanopowders and methods of making and using the nanopowders.

The invention provides a nano rare earth oxide as well as a preparation process and application thereof, and relates to the technical field of nano materials. The nano rare earth oxide is prepared from the following raw materials: rare earth ions, chitosan-hexadecyl trimethyl ammonium bromide, tea saponin, nano cellulose and a hydroxyapatite nano rod; the rare earth ions are selected from at least one of cerium ions Ce < 3 + >, yttrium ions Y < 3 + >, samarium ions Sm < 3 + >, terbium ions Tb < 3 + >, lanthanum ions La < 3 + >, praseodymium ions Pr < 3 + > and neodymium ions Nd < 3 + >. The prepared nano rare earth oxide can be used as an independent antibacterial agent, can also be used as a functional filler to be compounded with a polymer, and has application potential in the fields of medical instrument coatings, food packaging and the like.

The present invention discloses a method for preparing nano-metal oxides by thickening. The method comprises the following steps: heating and stirring a saccharide and an organic amine, adding a certain amount of a metal oxide precursor, and continuing to heat and stir to obtain a molten mixture; heating and carbonizing the molten mixture to obtain a dark brown fluffy solid; adding the dark brown fluffy solid to a barrier solution and stirring, wherein the barrier is a saccharide barrier or an inorganic salt barrier; evaporating the water in the solution to obtain a black solid; and calcining and washing the black solid to obtain the nano-metal oxide. The present invention places the barrier addition after carbonization, which allows for secondary dispersion of metal salts that are not fully dispersed during the stirring process, thereby improving the dispersion of the metal salts. The metal oxide has a lower dispersion in the carbon template, resulting in a larger size. The barrier is added later to fix the large-sized particles and prevent sintering and agglomeration due to insufficient stability during the calcination process caused by the reduction of the carbon template.

The invention relates to a photo-thermal composite phase-change material with a built-in electric field for driving heterogeneous interface electron transfer and a preparation method of the photo-thermal composite phase-change material. The preparation method comprises the following steps: adsorbing multi-element metal through a metal organic framework precursor, and performing high-temperature carbonization to construct a graphitized carbon encapsulated metal nanoparticle coupled metal oxide ternary heterogeneous interface structure carrier; a built-in electric field is induced to be generated at a heterogeneous interface by utilizing Fermi energy level difference between the metal nanoparticles and the metal oxide, and electrons are driven to be transferred between the metal nanoparticles and the metal oxide; rich oxygen vacancies in the metal oxide effectively capture electrons, and efficient and controllable photon-generated carrier separation and utilization are achieved; and a pi-pi conjugate network of graphitized carbon forms a continuous electron transmission channel, so that rapid conduction of heat is further guaranteed. The problems that a traditional composite phase change material is high in carrier recombination rate, single in photothermal conversion mechanism and insufficient in thermal management controllability are solved, and the composite phase change material has application potential in the fields of solar heat storage, industrial waste heat recovery, intelligent temperature control systems and the like.

The invention relates to the technical field of transformer fault detection, in particular to a low-temperature high-sensitivity detection method applied to transformer fault characteristic gas CO. The preparation method comprises the following steps: S1, preparing Y2O3 nano powder by adopting a chemical precipitation method; and S2, preparing the CO3O4 (at) Y2O3 composite material from the CO3O4 powder and the Y2O3 powder, and applying the CO3O4 (at) Y2O3 composite material to the low-temperature high-sensitivity detection of the fault characteristic gas CO of the transformer. According to the low-temperature high-sensitivity detection method applied to the transformer fault characteristic gas CO, through preparation and application of the composite material, the CO3O4-Y2O3 composite material can have high sensitivity, good stability and selectivity on the transformer fault characteristic gas CO at low temperature, meanwhile, the response of the CO3O4-Y2O3 composite material is remarkably superior to that of CO2, and the detection method has the advantages of high sensitivity, good stability and good selectivity on the transformer fault characteristic gas CO at low temperature. Therefore, the application requirement of on-line state monitoring of the transformer is met.

This invention relates to the field of rare earth oxide technology and provides a method for preparing rare earth oxide powder. The invention uses oxalic acid as a precipitant and employs an airflow precipitation reactor to carry out a precipitation reaction, obtaining a rare earth oxalate precursor. The oxalate precursor is then calcined to obtain rare earth oxide powder. This invention uses an airflow precipitation reactor to carry out the precipitation reaction, utilizing the disturbance effect of gas on the liquid to promote the exchange and mixing of substances during the precipitation reaction, making the precipitation reaction more uniform and complete, thereby obtaining a rare earth oxalate precursor with a smaller particle size. Calcination then yields rare earth oxide powder with a large specific surface area. Example results show that the specific surface area of ​​the rare earth oxide powder prepared by this invention reaches 20.586~52.499 m². 2 / g, and the particle size is uniform.

This invention provides a method for preparing high-purity ultrafine yttrium oxide, relating to the field of ultrafine oxide powder preparation technology. The method involves removing impurities from a 5N-6N grade yttrium chloride solution to obtain a yttrium chloride solution with low non-rare earth impurities. While emulsifying and shearing an ammonia solution, the low-non-rare earth impurity yttrium chloride solution is introduced into the solution via atomization until the pH of the resulting solution reaches 8-10, yielding a yttrium hydroxide colloidal solution. While emulsifying and shearing the yttrium hydroxide colloidal solution, an oxalic acid solution is introduced into the solution via atomization until the pH of the resulting solution reaches 1.8-2.5. The solution is then filtered to obtain ammonium oxalate yttrium precipitate. Finally, calcination yields high-purity ultrafine yttrium oxide powder. This invention can prepare high-purity ultrafine yttrium oxide with a purity of 99.999-99.9999%, D... 50 The diameter is 0.3–0.5 μm, D 90 With a diameter of less than 1.0 μm, it is suitable for applications such as transparent ceramics and electronic ceramics.

The invention relates to high-dispersion nano rare earth oxide particles and a preparation method thereof, and belongs to the technical field of nano material preparation. The preparation method adopts a Uniform-ST technology and comprises the following steps: (1) adding a rare earth salt precursor and a dispersing agent A into a solvent A to obtain a rare earth salt precursor solution in a homogeneous state; (2) adding a precipitant and a dispersing agent B into a solvent B to obtain a precipitant solution in a homogeneous state; (3) respectively adding the homogeneous solution prepared in the step (1) and the homogeneous solution prepared in the step (2) into a reactor, heating to a certain temperature, controlling the feeding speed, and filtering and washing to obtain a nano rare earth oxide precursor material; and (4) drying and calcining the nano rare earth oxide precursor material obtained in the step (3) to obtain the high-dispersion nano rare earth oxide particles. The preparation method provided by the invention is simple in process, short in reaction time, high in efficiency, uniform in granularity, good in repeatability and easy to industrially popularize.

The application discloses a chromium-doped yttrium oxide crystal material and a structural design method thereof, and belongs to the technical field of inorganic photoelectric functional crystal materials. + The crystal is of R3 trigonal crystal system minimum energy structure, Cr 9‑ The molar doping percentage is 3.125%, occupies a 1b Wyckoff site in a crystal lattice gap, forms [CrO6] 9‑ Regular octahedral coordination, Cr-O bond length is 2.073 angstrom; lattice constants a=b=10.4957 angstrom, c=18.1750 angstrom, a Γ point direct band gap is 3.23 eV, there is no virtual frequency in a phonon spectrum, dynamics is stable, simulated XRD is matched with an experimental spectrum, and Cr-O and Y-O bonds are all ionic bonds. The application realizes accurate determination of a ground state structure, stability verification and electronic property analysis by adopting CALYPSO structure prediction combined with first principle calculation, provides a standardized theoretical design process, and can be used for efficient development of photoelectric functional materials such as solid-state lasers, white light LEDs, solar cells and the like.

The invention relates to a metal oxide sheet with spherical convex particles and oxygen vacancies enriched on the surface, a preparation method and application. According to the sheet preparation method, metal oxide sheet xerogel is obtained through a heating bubbling method, and spherical convex particles and oxygen defects are enriched on the surface of the metal oxide sheet xerogel in combination with a staged annealing oxidation process. The diameter of the spherical convex particles on the surface of the thin sheet is 50-100 nm, the thickness of the thin sheet is 100-500 nm, the length and width size range of the thin sheet is not limited, and the thin sheet is suitable for various size specifications. The surface of the thin sheet is enriched with spherical convex particles and oxygen defects, so that adsorption sites with relatively high surface area / volume and high density can be provided, the surface electronic structure is improved, the electron transmission rate is accelerated, the sensing performance is enhanced, and the sensing stability is improved. The thin sheet has a wide application prospect in the fields of gas sensing, colorimetric sensing, fluorescence sensing, stress sensing, chemical sensing, photoelectric sensing and biological sensing.

The invention relates to an Nb3Sn superconducting material, a method for improving the critical current density of Nb3Sn through rare earth yttrium doping and application of the Nb3Sn superconducting material. The method comprises the following steps that the surfaces of a component A and a component B are attached and placed in a fixing device to form a diffusion couple, and the diffusion couple is subjected to diffusion annealing to obtain the Nb3Sn superconducting material; the component A comprises an Nb elementary substance ingot and / or an Nb-Y alloy ingot; the component B comprises a Cu-Sn alloy ingot and / or a Cu-Sn-Y alloy ingot; at least one of the component A and the component B contains Y. By doping the Y element, the growth rate of the Nb3Sn layer is increased, and the critical current density of the interface Nb3Sn superconducting material is improved. The constructed diffusion couple can visually compare the growth difference of the Nb3Sn layers in doped and undoped samples, and facilitates the analysis of the influence mechanism of the doped elements on the synthesis of the Nb3Sn superconducting material and the critical current density.

This invention relates to a method for preparing nano metal oxides and its use. The preparation method involves reacting a low-purity initial alloy containing the target metal element M and Al / Zn with a heated concentrated alkaline solution. Under specific reaction conditions, the initial alloy undergoes intense hydrogen evolution and Al / Zn-removal reaction, resulting in nanoscale fragmentation, followed by shape and composition reconstruction to form nano M oxides. Through further post-treatment, crystalline nano M oxides or modified nano M oxides can be obtained. This method is simple, fast, cost-effective, and suitable for large-scale production. It enables the preparation of nano metal oxides with various crystallinities, which have promising applications in fields including composite materials, catalytic materials, ceramic materials, refractory materials, advanced electronic materials, battery materials, chromogenic materials, wave-absorbing materials, wastewater degradation materials, antimicrobial materials, coatings, pigments, thermal spray materials, and sensors.

The invention relates to the technical field of rare earth nano material preparation, in particular to a system for preparing nano yttrium oxide by a spray pyrolysis method based on double closed-loop fluid control, which comprises a yttrium salt solution storage tank and a cooling water tank. The atomizing nozzle adopts a self-cleaning design, high-pressure N2 is sprayed for 0.2 s every 30 s, impurity blockage can be effectively prevented, it is ensured that the atomizing process is stable and efficient, frequent manual maintenance is not needed, the production cost and equipment loss are reduced, nano yttrium oxide particles prepared through double-closed-loop fluid control and an accurate pyrolysis process are uniform in particle control, and the particle size of the nano yttrium oxide particles is reduced. The specific surface area reaches 120 + / -5m < 2 > / g, and the sphericity is And in addition, when the temperature of the reaction furnace exceeds the standard, the emergency cooling system is rapidly started, rapidly cooled and stabilized in a safe range, reaction out-of-control and equipment damage are avoided, the safety and reliability of the production process are greatly improved, and the product quality is guaranteed.

This invention relates to the field of battery technology, and discloses a lithium-sodium composite lithium-rich manganese-based cathode material, its preparation method, and its applications. The preparation method includes: grinding and mixing a lithium source, a sodium source, a dopant, a nickel-manganese hydroxide precursor, and water to obtain a slurry; drying the slurry; and performing a first sintering to obtain a first-sintered product; reacting the first-sintered product in a weakly acidic salt solution with a pH of 2-4 to construct surface defects, followed by washing, filtration, and drying to obtain a dried product; and uniformly mixing the dried product with an oxide containing oxygen vacancies and performing a second sintering to form a double-layer coating of spinel phase and oxide, thereby obtaining the lithium-sodium composite lithium-rich manganese-based cathode material. The oxide containing oxygen vacancies includes one or more of CeO2, TiO2, La2O3, Y2O3, Co3O4, and perovskite. This invention features simple steps, low cost, and the prepared cathode material exhibits good electrochemical performance.

The invention provides yttrium oxide powder and a preparation method thereof, and the preparation method comprises the following steps: uniformly mixing yttrium salt and a solvent to obtain a yttrium salt solution, adding a first dispersing agent, and mixing until the first dispersing agent is dissolved in the yttrium salt solution to obtain a first solution; heating the first solution to a first temperature, dropwise adding a precipitant, continuously stirring, and continuously stirring for a preset time after the precipitant is dropwise added to obtain a second solution; standing and aging the second solution, then adding a second dispersing agent into the second solution, mixing, and continuing standing and aging to obtain a third solution; filtering the third solution to obtain a precursor; and washing and drying the precursor to obtain powder, and calcining the powder to obtain the yttrium oxide powder. According to the yttrium oxide powder and the preparation method thereof, agglomeration of the yttrium oxide powder can be reduced, and the yttrium oxide powder which is loose, high in specific surface area and excellent in sintering performance is obtained.

The application discloses a method for preparing nano yttrium oxide powder by solid phase grinding, wherein low-melting-point yttrium salt is dispersed by using molten dispersant, and yttrium element is uniformly dispersed on the dispersant matrix by vacuum heating and decomposition, so that yttrium precursor powder with high dispersity and without agglomeration can be obtained, and finally nano yttrium oxide powder can be obtained through calcination process. The particle size of the prepared yttrium oxide nano powder is 50-650nm, the specific surface area is 10-200m 2 / g, and the prepared yttrium oxide nano powder can be applied in the fields of electronic ceramic materials, fluorescent materials and other functional ceramics.

The invention belongs to the technical field of rare earth materials, and particularly relates to a preparation method of high-purity nano rare earth oxide powder. The method comprises the following steps: dissolving a rare earth carbonate or rare earth oxide raw material with nitric acid to obtain a rare earth nitrate solution; adding the dispersing agent solution into the rare earth nitrate solution to obtain a mixed material solution; the method comprises the following steps: pumping liquid carbon dioxide, liquid ammonia and deionized water into a sieve-plate tower in a parallel flow manner to obtain a mixed precipitator; the mixed material liquid and the mixed precipitant are pumped into a supergravity reactor in a parallel flow mode to react to obtain suspension liquid; the suspension, the crystal form control agent solution and a mixed precipitator are pumped into an ultrasonic crystallization reactor in a parallel flow mode to react, and rare earth oxide precursor slurry is obtained; and carrying out solid-liquid separation, washing, drying and calcining on the rare earth oxide precursor slurry to obtain the nano rare earth oxide powder. The product obtained through the method is narrow in particle size distribution, good in dispersity, controllable in morphology and suitable for industrial production of high-added-value nano rare earth oxide materials.

The present invention relates to the technical field of rare earth oxides and provides a method and apparatus for producing ultrafine rare earth oxide powder. The present invention involves introducing a rare earth salt solution, a precipitant solution, and a compressed gas into a centrifuge to carry out a precipitation reaction, obtaining a rare earth precipitate, which is then calcined to obtain ultrafine rare earth oxide powder. The present invention involves a continuous precipitation reaction in the centrifuge, where the rare earth salt solution and the precipitant solution pass through the centrifuge quickly, thereby reducing contact time and crystal growth time, thereby maintaining small particle size. The present invention also involves introducing compressed gas into the centrifuge, which significantly increases the turbulence of the precipitation reaction, helping the precipitate form crystal nuclei and making the precipitate less likely to change over time and grow. The precipitation reaction apparatus used in the present invention has a simple structure and requires a small equipment input. At the same time, the continuous reaction method improves production efficiency and yield, reducing production costs.

This invention relates to a method for preparing yttrium oxide with a large specific surface area. The method includes the following steps: S1, dissolving yttrium salt and adding tetramethylammonium hydroxide to precipitate; S2, washing with distilled water and centrifuging to dehydrate; S3, washing with ethanol and dehydrating; S4, adding diethylene glycol monobutyl ether and mixing evenly to form a paste; S5, calcining the paste formed in step S4 at a low temperature to form a powder; S6, adding anhydrous ethanol to the powder obtained in step S5 and ball milling; S7, drying. This invention uses tetramethylammonium hydroxide for precipitation, whose spatial structure reduces agglomeration. After washing, multiple washes with ethanol remove moisture, and then diethylene glycol monobutyl ether solution is added to form a paste, further reducing agglomeration during calcination. The calcination temperature is only 600-750℃, which is energy-saving and environmentally friendly. During ball milling, anhydrous ethanol is added, eliminating moisture during the process and reducing agglomeration. The yttrium oxide prepared by this method has a specific surface area of ​​100-200 m² / g. 2 / g.

The invention discloses a preparation method of a modified zinc oxide material for a gas sensor and a product and application of the modified zinc oxide material, a ZnO nano material is used as a carrier, and then modification is performed, so that the method provided by the invention can greatly improve the stability of ZnO, the sensitivity to methanol and the response time of ZnO; therefore, the metal oxide system material has a wider application prospect in the field of gas sensitive sensors. The composite ZnO material is prepared through Y modification, and the reaction activity and the response time of the material are greatly improved, so that the sensitivity, the response time and the selectivity of the gas sensitive material can be improved, and the method has practical application value for further promoting the development of semiconductor gas sensitive devices.

The invention provides a process method for preparing superfine medium and heavy rare earth oxides, and belongs to a rare earth hydrometallurgy separation process. The method comprises the following steps: taking a medium-heavy rare earth salt solution and a carbonate precipitant as raw materials, and carrying out feeding reaction in stages under the conditions of heating and stirring: carrying out first-stage reaction in a manner of synchronously and oppositely adding according to a specific molar feeding ratio, and carrying out heat preservation and aging; after crystals appear, supplementing the raw materials, adjusting the molar ratio, and carrying out a second-stage reaction; and carrying out suction filtration, washing, drying and calcining on the obtained slurry to obtain the superfine medium-heavy rare earth oxide. Wherein the molar feeding ratio of the rare earth ions to the bicarbonate radicals in the first-stage reaction is 1: (4-7), and the molar ratio of the rare earth ions to the bicarbonate radicals in the reaction system is increased to 1: (2.5-3.5) in the second-stage reaction. The method is low in cost, simple in process and small in filtering difficulty in actual operation, and the obtained product is fine in particle, good in dispersion and high in purity and can be industrially produced on a large scale.

The present invention relates to a powder comprising solid ceramic particles, characterized in that the particles have an internal porosity of at least 30%, preferably at least 45%, preferably at most 65%, and that the powder has a d10 grain size of at least 100 μm.

The application belongs to the technical field of rare earth materials, and particularly relates to a preparation method of high-purity nanometer rare earth oxide powder. Rare earth carbonate or rare earth oxide raw material is dissolved by nitric acid to obtain a rare earth nitrate solution; a dispersant solution is added into the rare earth nitrate solution to obtain a mixed liquid; liquid carbon dioxide, liquid ammonia and deionized water are pumped into a sieve plate tower in parallel flow to obtain a mixed precipitant; the mixed liquid and the mixed precipitant are pumped into a high gravity reactor in parallel flow to obtain a suspension; the suspension, a crystal form control agent solution and the mixed precipitant are pumped into an ultrasonic wave crystallization reactor in parallel flow to obtain a rare earth oxide precursor slurry; the rare earth oxide precursor slurry is subjected to solid-liquid separation, washing, drying and calcination to obtain the nanometer rare earth oxide powder. The product obtained by the method has narrow particle size distribution, good dispersibility and controllable morphology, and is suitable for industrial production of high-value nanometer rare earth oxide materials.

The present invention provides a zirconia sintered body and a method of production thereof satisfying both high translucency and high strength suitable even for front teeth and canines (particularly, central incisors and lateral incisors). The present invention relates to a zirconia sintered body comprising zirconia, and a stabilizer capable of preventing a phase transformation of zirconia, wherein the zirconia sintered body comprises 20 to 50% of particles having a particle diameter of 0.45 µm or more and less than 1 µm in a number-based particle size distribution of its crystal particles, the particle diameter being a diameter passing through the particle's center of gravity.