138results about "Yittrium oxides/hydroxides" patented technology

The invention belongs to the technical field of rare earth materials, and discloses a preparation method of high-purity sphere-like nano yttrium oxide powder. The method comprises the following preparation steps: (1) adding Y2O3 powder into concentrated hydrochloric acid, heating, stirring and dissolving, and then diluting with an ethanol water solution to obtain a YCl3 solution; (2) mixing ammonia water, a quaternary ammonium base aqueous solution and ethanol to prepare a precipitant solution, and dropwise adding the precipitant solution into the YCl3 solution in the step (1) for precipitation reaction to precipitate Y < 3 + >; and (3) separating and drying the precipitate obtained in the step (2), and then carrying out high-temperature calcination to obtain the high-purity spheroidal nano yttrium oxide powder. According to the preparation method, the ethanol water solution of YCl3 is used as a reaction solution, ammonia water is used as a main precipitator, quaternary ammonium base is used as an auxiliary precipitator and a surface active structure regulating agent, and yttrium oxide powder with the purity not lower than 5N and the particle size smaller than 100nm can be obtained.

The invention belongs to the field of functional material preparation, and particularly relates to a preparation method of a silicon-yttrium-carbon composite lithium ion battery negative electrode material, which comprises the following steps: (1) dispersing silicon nanoparticles, polyvinylpyrrolidone and yttrium salt in a deionized water solution to form a mixed solution, carrying out ultrasonic vibration dispersion, and then carrying out magnetic stirring in a room temperature air atmosphere; (2) transferring the obtained solution to a glass culture dish, and performing freeze drying in a freeze dryer; (3) transferring the precursor obtained by drying into a crucible, and placing the crucible in a tubular furnace for high-temperature calcination to obtain a silicon-yttrium-carbon composite material; and (4) grinding and mixing the obtained product with sodium alginate, conductive carbon black and deionized water respectively, uniformly coating the surface of a copper foil with the mixture, and then performing drying, slicing and tabletting treatment to obtain a target product. The preparation method is simple in synthesis process, good in electrode cycling stability, stable in structure and excellent in electrochemical performance.

The invention discloses a flame synthesis preparation system and method for a yttrium-stabilized zirconia nano-powder material. The system comprises a flame synthesis module, a raw material conveying module and a powder collecting module, the method comprises the following steps: 1, preparing a precursor solution synthesized by atomizing zirconium oxide nano powder; 2, preparing a precursor solution synthesized by atomizing yttrium oxide nano powder; and step 3, performing atomization synthesis to obtain the yttrium-stabilized zirconia powder material. According to the flame synthesis preparation system and method for the yttrium-stabilized zirconia nano-powder material, the high-performance nano-powder material is synthesized by adopting an atomized flame synthesis method, and the flame synthesis preparation system and method have the advantage that zirconia and yttrium oxide are uniformly doped.

Provided is an yttrium-based protective film which is excellent in plasma resistance and appearance. An yttrium-based protective film containing yttrium oxide is provided, wherein the yttrium-based protective film has a porosity of less than 0.5 vol % and a Vickers hardness of at least 800 HV. This 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 atoms / cm3 and a compressive stress of 100 to 1700 MPa.

The present invention relates to the technical field of rare earth, and in particular to a device and method for preparing a nano rare earth oxide by means of cooperation of ultrasonic waves and microwaves. By using the device, a nano rare earth oxide is prepared by means of processes such as stirring, reacting, filtering, washing, drying, and burning. The "internal heating" of microwaves and "cavitation" of ultrasonic waves can effectively accelerate the reaction, shorten the reaction time, and speed up the reaction rate, so as to obtain nanomaterials with no agglomeration and uniform particle size; the heat effect of the ultrasonic waves provides enough energy for ions waiting for nucleation in a solution, so as to promote formation of crystal nucleuses; and the chemical effect of ultrasonic waves can effectively promote primary nucleation and secondary nucleation of crystals, and provides energy for ions which cannot be nucleated. Stirring is implemented by means of the "cavitation" and mechanical effect of ultrasonic waves, and the strength of stirring is far higher than that of common mechanical stirring, effectively hindering grain growth, and thus obtaining superfine powder having a small particle size, good dispersity and complete crystallization.

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 invention discloses a lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The positive electrode material comprises a main body material as well as a metal oxide coating layer and a carbon layer which sequentially coat the main body material from inside to outside, the general chemical formula of the main body material is Li < x > Na < 1-x > CoO2; and the crystal phase of the main body material is an O2 phase. The positive electrode material can be used for preparing a lithium ion battery, and is prepared by the following steps: S1, mixing and sintering a sodium source and a cobalt source to obtain a P2-phase precursor; s2, preparing O2-phase lithium cobalt oxide from the P2-phase precursor and a lithium source; and S3, mixing the O2-phase lithium cobalt oxide with organic metal salt, and sintering at low temperature. According to the method, O2-phase lithium cobalt oxide is coated in a low-temperature sintering mode, compared with an existing coating mode, the coating effect is good, and coating elements cannot be diffused into the main body material.

The present invention relates to the technical field of metal coating materials, and in particular to a coating preparation method for reducing coating defects and reducing porosity. Yttrium oxide powder and YAG powder are used together as coating materials, which solves the problem that when spraying YAG powder alone on a substrate, a primer is required for bonding, and the formed YAG coating has many vertical fine lines, and occasionally has lines in other directions, and the yttrium oxide coating formed by spraying yttrium oxide powder alone has many horizontal fine lines, and occasionally has lines in other directions, thereby reducing the porosity of the coating; the yttrium oxide powder is prepared by a precipitation method, and by adding a dispersant, the obtained yttrium oxide powder has a small particle size, a narrow particle size distribution, a large loose density, and good fluidity. After mixing with YAG powder, it has a good conveying state, avoiding the phenomenon of insufficient melting of yttrium oxide powder and overburning of YAG powder, thereby reducing coating defects.

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.

To provide a rare earth oxide fine powder capable of: being easily dispersed without an intense crushing process; forming a thin coating film; or obtaining a highly dispersed slurry without the use of a dispersing agent, thereby maintaining a stable transparency.SOLUTION: The present invention relates to powder of oxides of a rare earth element other than Ce, which satisfies (a) or (b). (a) A primary particle diameter is 10 to 60 nm, satisfying (I) or (II). (I) D100 measured by ultrasonic dispersion is 1 to 10 μm. (II) When the true density is ρ, a difference between porosity PAD(%) calculated from the initial bulk density AD and porosity PTD(%) calculated from the tapped bulk density TD is 2.0 to 5.0%. PAD=(1-AD / ρ)×100 PTD=(1-TD / ρ)×100 (b). A primary particle size is 10 nm or larger and smaller than 100 nm, satisfying (III) and (IV). (III) A value obtained by multiplying a pore volume of 0.005 to 100 μm in pore diameter by the true density is 3 to 14. (IV) A value obtained by multiplying a pore volume of 5 to 50 nm in pore diameter by the true density is 0 to 2.0.SELECTED DRAWING: None

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 invention discloses a method for reversibly adjusting Y2O3 surface atomic-scale mechanochemical removal behaviors, and belongs to the technical field of atomic-scale precision material removal. Comprising the following steps: S1, performing ultraviolet irradiation treatment on Y2O3 to obtain a primary treatment sample; and S2, in an atmospheric environment, applying a certain load to the Al2O3 needle tip, rubbing the surface of the primarily treated sample, and realizing a mechanochemical removal behavior in the rubbing process. According to the method, ultraviolet rays are utilized to irradiate the surface of Y2O3, electron transition of the Y element in Y2O3 is promoted to form a color center, and the surface of Y2O3 has mechanochemical activity; then, in the atmospheric environment, a certain load is applied to the Al2O3 needle tip to rub the Y2O3 surface, a mechanochemical reaction can be generated on the friction interface, a Y-O-Al bond bridge is formed, and then the atomic-scale precision material removal behavior is achieved. Due to the fact that the applied stress acts on the plane in a pure elastic deformation mode, the lower-layer plane cannot be damaged, and the integrity of the lower-layer surface structure is guaranteed.

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.

To provide a Y2O3 containing film deposition material suitable for a plasma etching device member and high in plasma resistance, and a method for manufacturing the same.SOLUTION: A film deposition material includes a solid solution including metal oxide consisting of ZrO2, HfO2 or Nb2O5 and Y2O3. When the metal oxide is ZrO2, the content of ZrO2 is 2-12 mol%; when the metal oxide is HfO2, the content of HfO2 is 4-24 mol%; when the metal oxide is Nb2O5, the content of Nb2O5 is 1-8 mol%; and the crystal structure of the solid solution has the regular hexahedron crystal structure of Y2O3.SELECTED DRAWING: None

This application relates to the technical field of ceramic materials, and particularly to a preparation method for producing yttrium oxide spraying powder by hydrothermal method, which comprises the following steps: preparing slurry by adding water to yttrium hydroxide - hydrothermal treatment - calcination - grinding - modification - granulation - degumming - screening - impurity removal; the preparation method for producing yttrium oxide spraying powder by hydrothermal method in this application enables yttrium hydroxide to form an effective crystallization mechanism through specific hydrothermal treatment and specific surface modification, so that the yttrium oxide slurry has good suspension property, the compacted density of the powder after granulation is large, the strength is high, it is not easy to break, and the use effect is good; the spraying powder with good crystal lattice has a white coating appearance under the thermal spraying process, high bonding strength with the substrate, and low cost.

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.

A composition based on zirconium oxides, cerium oxides, and at least one rare earth element other than cerium, having a cerium oxide content of at most 50% by mass, characterized in that, after calcination at 1000 °C for 6 hours, it exhibits a maximum reducibility temperature between 450 °C and 480 °C and a specific surface area between 55 m² 2 / g and 60 m 2 / g.

The invention discloses a lithium cobalt oxide positive electrode material based on nano-sol low-temperature coated O2 configuration and a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode materials. An ion exchange method is adopted, firstly, a sodium-containing layered oxide is synthesized through a high-temperature calcination method, then the sodium-containing layered oxide and fused salt are fully mixed for ion exchange, and the lithium cobalt oxide positive electrode material based on the nano-sol low-temperature coated O2 configuration can be obtained after filtering, washing and drying. According to the preparation method, the nano sol is prepared by adopting a high-shear homogenizing technology, and the O2 lithium cobalt oxide positive electrode material is coated at low temperature to realize surface modification, so that a uniform nano coating is formed, and the electrochemical performance of the nano coating is improved. According to the method, the cycling stability and the rate capability of the material can be remarkably improved, and a new thought is provided for research and development of a high-energy-density lithium ion battery.

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.