68results 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.

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.

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 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.

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 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 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 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 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.

A film-forming material of the present invention contains an oxyfluoride of yttrium represented by YOXFY (X and Y are numbers satisfying 0<X and X<Y) and YF3, wherein a ratio I2 / I1 of a peak height I2 of the (020) plane of YF3 to a peak height I1 of the main peak of YOXFY as analyzed by XRD is from 0.005 to 100. It is preferable that a ratio I4 / I1 of a peak height I4 of the main peak of Y2O3 to the peak height I1 of the main peak of YOXFY as analyzed by XRD is 0.01 or less.

The invention discloses a method for deeply removing chromium from a rare earth oxide and preparing a high-purity rare earth oxide, which comprises the following steps: dissolving the rare earth oxide with the rare earth main grade of 99.9-99.99% by hydrochloric acid to obtain a rare earth chloride feed liquid, adsorbing the rare earth chloride feed liquid by cheap and easily available Ce (OH) 4 in an oxidizing atmosphere environment to obtain a high-purity rare earth chloride feed liquid, and leaching by CL-P507 to remove rare earth impurity elements, thereby obtaining the high-purity rare earth oxide. And finally, precipitating through oxalic acid, and firing to obtain the 5N rare earth oxide. Through the process, Cr is deeply removed, rare earth impurity elements are removed through CL-P507 extraction leaching, the rare earth main grade of the prepared high-purity rare earth oxide reaches 5N, and the Cr content is smaller than 0.05 pm.

The invention discloses a preparation method of ternary composite doped modified lithium manganate, which comprises the following steps: by taking Li2CO3 as a lithium source, a multivalent manganese oxide mixture as a manganese source and aluminum isopropoxide, magnesium isopropoxide and tetrabutyl titanate as a ternary doping source, preparing precursor powder by a sol-gel method, and then performing segmented sintering to obtain a ternary doped lithium manganate matrix; the preparation method comprises the following steps: preparing a composite coating solution from tert-butyl chromate, tetrabutyl titanate and Y2O3, carrying out fluidized bed spray coating, and carrying out segmented heating and cooling sintering, screening and demagnetizing treatment to obtain a target product. According to the preparation method, the lattice structure is synergistically optimized through a multivalent manganese source and ternary doping, the Cr2O3-TiO2 / Y2O3 composite coating layer can effectively block direct contact between a matrix and an electrolyte, the occurrence probability of interface side reactions is reduced, and the lattice stability and interface performance of the material are remarkably improved in cooperation with process regulation and control. The initial discharge specific capacity of the product is excellent, the high-temperature cycle and storage stability are greatly improved, and the manganese ion dissolving amount and the interface impedance are effectively reduced.

The invention discloses a method for separating and recovering valuable metals from industrial waste containing zirconium and yttrium, which comprises the following steps: mixing the industrial waste containing zirconium with a flux, and roasting at high temperature to obtain an alkali fusion material; the alkali fusion material is crushed and levigated, water is added for stirring and leaching, and a water leaching material and a water leaching solution are obtained; adding water and hydrochloric acid into the water leaching material, controlling the pH value, stirring and leaching to obtain a transformation material and transformation liquid; mixing the transformed material with hydrochloric acid, heating, stirring and leaching to obtain acid leaching liquid and acid leaching residues; adding a zirconium precipitating agent into the pickle liquor, preserving heat, precipitating, filtering and separating to obtain basic zirconium sulfate and a yttrium-containing solution; roasting the basic zirconium sulfate at high temperature to obtain a zirconium oxide product; adding an oxalic acid solution into the yttrium-containing solution, preserving heat and settling to obtain yttrium oxalate and yttrium-deposited liquid; roasting yttrium oxalate at high temperature to obtain a yttrium oxide product; according to the method, valuable metal resources of zirconium and yttrium in the zirconium-yttrium industrial waste are separated and recycled, and high-value recycling treatment of the zirconium-yttrium waste is achieved.

The present application relates to the technical field of photovoltaic cell manufacturing, and particularly relates to a yttrium oxide-based coating material, a composite carrier plate and a preparation method thereof. The yttrium oxide-based coating material is of a core-shell structure, comprising a yttrium oxide core and a silicon shell layer covering the yttrium oxide core; the mass ratio of Si in the yttrium oxide-based coating material is 5% to 20%, and the mass ratio of Y2O3 in the yttrium oxide-based coating material is 80% to 95%; wherein, the particle size of the yttrium oxide-based coating material is 30 µm to 60 µm, the sphericity of the yttrium oxide-based coating material is 99% to 100%, and the thickness of the silicon shell layer is 3 µm to 10 µm. The composite carrier plate prepared by using the yttrium oxide-based coating material as raw material overcomes the defect of insufficient coating bonding strength in the prior art, and solves the technical problem that the poor bonding effect between the existing yttrium oxide coating and carbon / carbon composite material leads to the difficulty of the carrier plate in meeting the process requirements of photovoltaic cells.

To provide a yttrium-based protective film with excellent plasma resistance and appearance. [Solution] A yttrium protective film is provided that contains yttrium oxide, has a porosity of less than 0.5 volume%, a Vickers hardness of 800 HV or higher, a crystallite size of 40 nm or less, and a compressive stress of 100 to 1700 MPa. This yttrium protective film has a thickness of 0.3 μm or more, an orientation of the (222) plane of Y2O3 of 50% or more, and a hydrogen atom count of 5.0 × 10¹⁶ 21 pieces / cm 3 The following is preferable:

A material synthesis method may comprise: obtaining at least one liquid precursor solution comprising one or more solutes determined based on atomic stoichiometry of target particles; adding the at least one liquid precursor solution to an atomizer device; generating at the atomizer device an aerosol; transporting the aerosol to a reactive zone of a predetermined temperature for a predetermined time; and obtaining synthesized particles by evaporating one or more solvents from the aerosol in the reactive zone.

The application discloses a kind of amino acid-mediated amorphous rare earth oxide synthesis method, belong to rare earth oxide synthesis field.The application uses rare earth salt as raw material, amino acid is used as additive, and precursor system is prepared by adding alkali, then hydrothermal reaction is carried out, and then amorphous rare earth oxide is separated from hydrothermal reaction product.Compared with the traditional hydrothermal method for synthesizing crystalline rare earth oxide, the method utilizes the complexation of rare earth salt with amino acid during hydrothermal reaction, the formation of hydroxide is hindered, and it is easier to generate isotropic amorphous rare earth oxide particles, and the separation of crystalline and amorphous products can be achieved by decantation method, and various amorphous rare earth oxides can be prepared, with highly uniform morphology as microspheres.

The application discloses a kind of high sphericity yttrium oxide granulation powder and preparation method, the preparation method includes the following steps: S1, dispersing agent is mixed with deionized water, yttrium oxide powder is added to prepare the slurry with solid content of 30%-45%, slurry is ball milled;S2, the slurry obtained is first spray granulation, and spherical yttrium oxide granulation powder is prepared;S3, spherical yttrium oxide granulation powder is degreased, and intermediate powder without additive is prepared;S4, dispersing agent is mixed with deionized water, and the intermediate powder obtained in S3 is added to prepare the slurry with solid content of 40%-50%, slurry is ball milled;S5, binder and defoaming agent are added in the slurry obtained in S4, and stirring;S6, the slurry prepared in S5 is second spray granulation, and high sphericity yttrium oxide granulation powder is prepared;The application can solve the problem that the sphericity of the yttrium oxide granulation powder prepared by the existing spray granulation is poor, which easily leads to the cracking of green body during forming.

The application relates to the technical field of battery negative electrode materials, and discloses a negative electrode material and a preparation method and application thereof. The negative electrode material comprises a base material and a coating layer coated on the outer surface of the base material. The base material comprises a graphite base and a dopant doped in the graphite base, and the dopant comprises CeO2 and Yb2O3. The coating layer comprises Li4CeO3. The space coupling of the layer-expanding effect of CeO2 and the pinning effect of Yb2O3 improves the capacity of a lithium ion battery, guarantees fast charging, and improves the cycle life of the lithium ion battery. The Li4CeO3 coated on the base material has excellent lithium ion conduction capacity, significantly reduces the energy barrier of lithium ions from the electrolyte into the electrode solid surface, and can improve the interface conduction and the cycle life of the lithium ion battery even at low temperature.