188results about "Yittrium oxides/hydroxides" patented technology

The invention discloses a preparation method of silicon-based composite aerogel containing metal oxide, which comprises the following steps: by taking a silicon source such as silica sol or silicate ester and inorganic metal salt as reaction raw materials and an alcohol-water solution as a solvent, controlling hydrolysis and polycondensation of reactants by adjusting the pH value of a reaction solution, and obtaining double-phase / multi-phase sol only through one-step hydrolysis; the preparation process of the sol is simplified, the rapid preparation of the gel is realized by combining a microwave curing process, and the obtained gel is subjected to solvent replacement and drying to obtain the silicon-based composite aerogel containing the amorphous metal oxide. The silicon-based composite aerogel prepared by the invention has excellent high-temperature resistance, and still maintains an amorphous phase structure after being subjected to heat treatment for 30 minutes at 1000 DEG C, so that structural collapse caused by crystallization is avoided.

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 yttrium oxide powder and a preparation method thereof. The preparation method of the yttrium oxide powder comprises the following steps: 1) mixing an yttrium salt solution with a precipitator solution to prepare a mixed solution; wherein the molar ratio of yttrium ions in the yttrium salt to the precipitant is 1: (2-15); 2) adding C2-C5 alkanediol into the mixed solution, and reacting at the temperature of 60-160 DEG C to prepare a precipitate precursor; and 3) calcining the precipitate precursor prepared in the step 2) at 500-1200 DEG C to prepare the yttrium oxide powder. The yttrium oxide powder prepared by the method is small in primary particle size and relatively narrow in particle size distribution.

According to the method, Y (NO3) 3.6 H2O or YCl3. 6H2O is taken as yttrium salt, C4H6O6 is taken as a'one-cage 'reaction chelating agent to be directly chelated with metal ions, metal Y < 3 + > is coated with a cage-shaped structure, syrup is taken as an auxiliary agent to be grafted outside the chelating agent to form a'two-cage', crystal nucleus growth is stabilized, and the nano yttrium oxide is prepared. The uniform nucleation of yttrium oxide is regulated and controlled by a double-cage structure, and the growth speed of crystals is controlled through a water bath reaction under a high-concentration acidic condition, so that a nano yttrium oxide material is successfully prepared; in the synthesis process, inorganic salt and food-grade additives which are low in cost and easy to obtain are used as raw materials, the cost is low, reagents are environment-friendly and safe, the green technology innovation advocated by the double-carbon strategy is met, the method is simple and easy to implement, the repeatability is good, large-scale production can be achieved, and the commercialization process of functional ceramic materials can be effectively promoted.

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 discloses an industrial preparation method of nano yttrium oxide for electronic ceramics, belonging to the field of rare earth hydrometallurgy technology. The invention first dissolves yttrium oxide in nitric acid to remove anionic impurities in yttrium oxide, then removes impurities through (NH4)2S solution to obtain a high-purity yttrium nitrate solution, then precipitates yttrium carbonate crystals through ammonia water and ammonium bicarbonate solution, and finally calcines and decomposes to obtain nano yttrium oxide for electronic ceramics. The yttrium oxide obtained by the invention is nano-sized, has a high specific surface area, and is easy to disperse. It is suitable for the electronic ceramic industry, especially for industrial production, and has broad application prospects.

Since theoretical studies point out that Y2O3 hollow microspheres are promising to develop a near-perfect solar reflector, the Inventors experimentally fabricate Y2O3 hollow microspheres using a carbon microspheres templated hydrothermal approach. By integrating Y2O3 hollow microspheres with KBr binder, the coating achieves a high solar reflectivity, comparable to or exceeding the state of the art materials reported in the literature and the materials commercially available in the market.

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

The invention relates to a nano cerium-zirconium oxide as well as a preparation method and application thereof, and belongs to the technical field of automobile exhaust purification. Water-soluble polyamide is used as an auxiliary adsorption material, so that the utilization rate of rare earth metal elements and the dispersity of the rare earth metal elements in a final product are improved, and the material cost is reduced and the highest oxide high-temperature thermal stability is improved. Meanwhile, adsorption points of rare earth metal elements in the PAM-rare earth metal complex play a role in heterogeneous nucleation, and crystal nucleus formation can be promoted; and the water-soluble PAM is beneficial to improving the content of substances around crystal nucleuses, accelerating the crystallization process and obtaining large-size crystals, and is beneficial to shortening the crystallization aging time. Hydrophilic groups and hydrophobic groups exist in water-soluble PAM molecules at the same time, so that the water surface tension can be reduced, the dispersity of hydroxide colloid in a precipitation flocculating constituent is improved, and the reduction of the specific surface area caused by agglomeration is reduced; meanwhile, a PAM molecular chain can slow down collapse of a crystal pore channel structure caused by water loss in the process of roasting hydroxide colloid into oxide at high temperature.

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.