27 results about "YTTRIUM FLUORIDE" patented technology

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention belongs to the field of electronic packaging materials, and particularly relates to a high-thermal-conductivity ceramic material for LED packaging and a manufacturing process of the high-thermal-conductivity ceramic material for LED packaging. The high-thermal-conductivity ceramic material is prepared from silicon nitride, aluminum nitride, magnesium fluoride, yttrium fluoride, lithium carbonate and two newly-designed modified compounds. The phase change regulator is composed of a boron-doped rare earth silicate nanocrystalline phase change regulator and a bimetallic chalcogenide compound interface modifier according to a specific weight part ratio. The preparation process mainly comprises the following steps: ball-milling and mixing the components, drying, granulating, and carrying out segmented hot pressed sintering in a protective atmosphere to finally obtain the compact ceramic material. The high-power LED packaging structure is particularly suitable for packaging of high-power LEDs, and the technical problem that heat dissipation and mechanical performance are difficult to consider at the same time is effectively solved.

The application belongs to the field of new materials, and discloses an alumina ceramic with low thermal expansion coefficient, which is formed by sintering raw materials, the raw materials comprising: alumina: 98.5-99.1 wt%; silicon powder: 0.15-0.25 wt%; magnesium oxide: 0.15-0.25 wt%; yttrium fluoride: 0.15-0.25 wt%; and fused crystal beta-cristobalite: 0.25-0.75 wt%. The product is composed of four-element ceramic formula of Al, Si, Mg and Y, which meets the demand of the market for 99 alumina ceramic products with low thermal expansion coefficient, and greatly improves the application value of 99 alumina ceramic in ceramic substrates and electrostatic chucks. Meanwhile, the application also discloses a preparation method of the alumina ceramic.

The invention relates to the technical field of rare earth metal electrolysis cathode protection coatings, in particular to an in-situ generated rare earth oxide diffusion barrier layer on the surface of a tungsten cathode. According to the method, fused salt electrodeposition and sol chemical deposition are combined, and a composite diffusion barrier layer of an yttrium tungstate binding layer / yttrium oxyfluoride barrier layer is constructed on the surface of a tungsten cathode in situ; the method comprises the following steps: firstly, enabling sodium tungstate to react with yttrium fluoride in fused salt through electro-deposition, and generating a compact and firmly combined yttrium tungstate layer on a tungsten substrate in situ; and then a compact surface layer of multiple yttrium oxyfluoride layers is constructed on the surface of the tungsten cathode by adopting a sol-gel method, strong interface bonding is realized by utilizing an in-situ reaction, surface hole sealing is realized by utilizing the densification characteristic of yttrium oxyfluoride, finally, a composite protection structure is formed, and the high-temperature oxidation resistance and molten salt corrosion resistance of the tungsten cathode are remarkably improved.

This invention belongs to the field of ceramic material preparation technology and discloses a method for preparing high-strength ceramics. The method uses micron-sized silicon carbide and nano-sized alumina as the base ceramic phases, adding nickel-coated alumina microspheres as a biomimetic toughening phase, combined with samarium fluoride-yttrium fluoride composite additives, nano-molybdenum powder and other sintering aids, as well as a specific molding and dispersion system and defect control agents. High-strength ceramics are obtained through biomimetic composite slurry preparation, DLP photopolymerization molding, gradient debinding, and segmented pressureless sintering. This method can prepare products with complex shapes, and the resulting ceramics have high density, high flexural strength, high fracture toughness, and excellent corrosion resistance and thermal shock resistance. They are suitable for wear-resistant parts and seals in electromechanical and petrochemical equipment, and their comprehensive performance meets the requirements of harsh working conditions.

A core-shell nanoparticle having a cleaned nitrogen-vacancy nanodiamond (NVND) core surrounded by an upconversion nanoparticle (UCNP) shell, wherein the cleaned nitrogen-vacancy nanodiamond (NVND) core comprises a cleaned nitrogen-vacancy nanodiamond, wherein the UCNP shell comprises an upconversion nanoparticle (UCNP), wherein the UCNP comprises lithium yttrium fluoride (LiYF4) doped with a lanthanide ion combination, wherein the lanthanide ion combination comprises a M1 ion and a M2 ion, wherein M1 is ytterbium (Yb) or neodymium (Nd) and M2 is erbium (Er), thulium (Tm) or holmium (Ho), and wherein the core-shell nanoparticle emits a red-emission upon a near-infrared (NIR) excitation is disclosed. Integration of cleaned NVNDs with UNCPs for enhancing optical manipulation and enabling efficient energy transfer for applications in biological imaging, quantum sensing and laser cooling is disclosed.

The invention discloses a compound optical amplitude limiting structure based on stimulated Brillouin effect and a design method thereof, and relates to the technical field of laser amplitude limiting, the compound optical amplitude limiting structure comprises packaging protection layers which are sequentially arranged along the optical path direction, the packaging protection layers are made of neodymium-doped lithium yttrium fluoride glass, the packaging protection layers are in a rectangular flat plate shape, and the packaging protection layers are made of neodymium-doped lithium yttrium fluoride glass. Extending narrow edges are arranged on the two sides in the light path direction, so that a combined structure with a containing space is formed; the first optical amplitude limiting dielectric layer is made of CS2 liquid, and one side of the isolation layer is in contact with the surface of the first optical amplitude limiting dielectric layer; the second optical amplitude limiting dielectric layer is made of TeO2 crystals, and the compound optical amplitude limiting structure based on the stimulated Brillouin effect and the design method of the compound optical amplitude limiting structure solve the problem that in the prior art, a laser amplitude limiting material is difficult to give consideration to both high and low light transmittance and high light consumption rate at the same time. The compound optical amplitude limiting structure based on the stimulated Brillouin effect and the design method of the compound optical amplitude limiting structure based on the stimulated Brillouin effect solve the problem.

The invention belongs to the field of aluminum alloy surface treatment, and particularly relates to an electrochemical fluorination self-hole-sealing method for an aluminum alloy. The method comprises the following steps: (1) preparing a first coating on the surface of the aluminum alloy through an electrochemical method; (2) preparing a second coating through an electrochemical method; wherein the first coating is aluminum fluoride, and the second coating is a mixed coating of aluminum fluoride and yttrium fluoride.

The invention belongs to the technical field of new energy materials and devices, and relates to a high capacity retention rate lithium-rich manganese-based positive electrode material synthesis method, which comprises: co-precipitating to synthesize a nickel cobalt manganese carbonate precursor; the preparation method comprises the following steps: dispersing a nickel-cobalt-manganese carbonate precursor in an organic solvent to form a precursor suspension, dispersing a single-source dopant in the organic solvent to form a dopant suspension, and carrying out liquid-phase mixing on the precursor suspension and the dopant suspension to prepare an intermediate; and fully grinding and mixing the intermediate and a lithium source, and calcining at high temperature to obtain the lithium-rich manganese-based positive electrode material. Specific metal fluoride is selected as a unique dopant source, and an innovative liquid phase mixing process is combined, so that the dopant is uniformly dispersed, the crystal structure is optimized, and the cycling stability of the material is remarkably improved. Experiments show that under the doping proportion of 0.4 mol% of yttrium fluoride, the capacity retention ratio of the material after circulation for 100 times reaches up to 97.59%, which is far better than that of an undoped material (79.94%), and the problem of fast capacity fading of a lithium-rich manganese-based positive electrode is solved.

The invention discloses a rare earth sodium yttrium fluoride-based flexible composite material with self-recovery force luminescence and a preparation method thereof. The flexible composite material comprises two parts, namely an optical function material and an elastic carrier material, wherein the optical function material is sodium yttrium fluoride-based fluorescent powder (NaY (1-x) F4: xRE3 + (RE = Tb / Er / Tm / Sm) and is synthesized through a high-temperature solid-phase method, the carrier material is polydimethylsiloxane (PDMS) or polyurethane, and a natural rubber elastomer material, the optical function material and the elastic carrier material are prepared and fully mixed to prepare a precursor, the precursor is put into a heat preservation box to be subjected to heat preservation for more than 2 hours at a specific temperature, and the optical function material is obtained. The flexible composite material of the rare earth sodium yttrium fluoride-based dynamic luminescent fluorescent powder is obtained. According to the rare earth sodium yttrium fluoride-based flexible composite material with self-recovery mechanoluminescence and the preparation method thereof, the needed raw materials are simple, the process is convenient, large equipment is not needed, mass production is convenient, performance is stable, pollution is avoided, energy charging is not needed, self-recovery and luminescence efficiency is high, elasticity is good, and flexibility is good.

The application discloses a preparation method of 6005A large-section high-performance rail section, and belongs to the technical field of aluminum sections. The composite refining agent prepared by adding specific aluminum powder, fluorite, yttrium fluoride and sodium carbonate through calcination significantly improves the degassing and deslagging effect of aluminum alloy liquid, reduces hydrogen content and non-metallic inclusions, provides a high-quality ingot basis for subsequent casting and extrusion, is beneficial to improving the comprehensive mechanical properties of the section, and after optimizing the composition and process of the 6005A large-section high-performance rail section, the tensile strength of the section after aging reaches 280-290MPa, the yield strength reaches 245-255MPa, and the elongation after fracture reaches 10%-12%, which meets the strict performance requirements of high-end rail transit sections, realizes efficient and stable production of large-section sections, significantly improves the mechanical properties and dimensional accuracy of the 6005A large-section rail section, fills the gap of the prior art in the preparation of high-performance 6005A-T6 sections with wide width and thin wall, and has excellent technical effects and industrial application value.

The invention relates to a preparation method of core-shell structure yttrium fluoride-yttrium oxygen fluoride compound composite spraying powder, and relates to the field of material preparation, and the preparation method comprises the following steps: preparing a YCl3 solution by using YCl3. 6H2O; the preparation method comprises the following steps: adding YF3 powder into a YCl3 solution, adjusting the pH value to 3.8-4.5, adding a urea solution, heating, stirring and reacting, depositing a YOHCO3 layer on the surface of the YF3 powder, filtering, washing and drying to obtain YF3 powder coated with the YOHCO3 layer; preparing a yttrium fluoride acid ammonium salt solution, adding the YF3 powder coated with the YOHCO3 layer into the yttrium fluoride acid ammonium salt solution, heating and stirring to volatilize the solvent, separating out yttrium fluoride acid ammonium salt, and mixing the yttrium fluoride acid ammonium salt with the YOHCO3 layer to obtain mixed powder; calcining, granulating and calcining the mixed powder to obtain the yttrium fluoride-yttrium oxygen fluoride compound composite spraying powder with the core-shell structure. The prepared core-shell structure spraying powder can inhibit volatilization of fluorine elements and permeation of oxygen elements, and the uniform melting behavior of the core-shell structure spraying powder is beneficial for obtaining a coating with stable components and a compact structure.

A yttrium fluoride-based sprayed film containing YF3 crystal phase of an orthorhombic system, not containing YF3 crystal phase other than the orthorhombic system, and having a Vickers hardness of 350 or more is produced by plasma spraying of a sprayed powder containing YF3 crystal phase of an orthorhombic system, not containing YF3 crystal phase other than the orthorhombic system. A yttrium fluoride-based sprayed film having high film hardness and small amount of particles generated when exposed to halogen-based gas plasma can be provided, and such a sprayed film is excellent as a sprayed film formed in a member for a semiconductor manufacturing apparatus used in a semiconductor manufacturing process. In addition, according to the present application, such a yttrium fluoride-based sprayed film can be efficiently produced.

The utility model relates to the technical field of yttrium fluoride storage, and discloses a yttrium fluoride storage device which comprises a storage tank, a box body is fixedly connected to the top of the storage tank, a strip-shaped groove communicated with the interior of the box body is formed in the top of the storage tank, and a moisture-proof assembly is arranged in the box body and comprises a bearing plate. The bearing plate is slidably connected to the interior of the box body, a through groove is formed in the surface of the bearing plate, a damp-proof plate is placed on the surface of the bearing plate, four sets of symmetrically-formed through holes are formed in the surface of the bearing plate, and positioning rods are slidably connected into the through holes. According to the yttrium fluoride storage device, the through groove is communicated with air in the tank, moisture is actively absorbed, meanwhile, multiple physical barriers are formed by the thread sealing of the feeding opening and the sealing cover and the sealing rubber ring of the feeding opening, external moisture invasion is blocked, and when yttrium fluoride is stored for a long time in a high-humidity environment, chemical purity reduction or caking failure caused by deliquescence of the yttrium fluoride is avoided.

The present application relates to the technical field of ceramic preparation, and discloses a low-temperature sintering method for yttrium oxide ceramics, which comprises the following steps: mixing yttrium oxide powder with halide complex phase additives containing anhydrous yttrium chloride and anhydrous yttrium fluoride, and pressing the mixture into a green body; first, heating in a dry inert atmosphere to make the additives melt and wet the particles; then, introducing water vapor and controlling the partial pressure, using the priority hydrolysis of yttrium chloride to build a porous framework, and maintaining the communication of exhaust channels; finally, increasing the temperature and the water vapor partial pressure to drive the hydrolysis of yttrium fluoride and complete the densification. The present application uses the step-by-step hydrolysis characteristics of the additives to realize the ordered transition from liquid phase filling to solid phase framework support, and solves the problems of premature closure of exhaust channels and deformation of the green body due to bubbling during low-temperature sintering. The prepared yttrium oxide ceramics have fine grains, high density and no grain boundary impurities, and have excellent mechanical properties and corrosion resistance.

A plasma processing apparatus includes: a processing chamber disposed inside a vacuum container and in which plasma is formed; and a member which is a member forming an inner wall surface of the processing chamber and is disposed on a surface to be exposed to the plasma and has a coating film formed by spraying of yttrium fluoride or a material containing the yttrium fluoride. A ratio of an orthorhombic crystal of the yttrium fluoride or the material containing the yttrium fluoride forming the coating film relative to the entirety is 60% or more.

The application discloses a kind of corrosion-resistant high-strength aviation aluminum alloy material and preparation method thereof, and relates to the technical field of new aviation aluminum alloy material.The application in preparation corrosion-resistant high-strength aviation aluminum alloy material, sodium chloride, potassium chloride, cryolite, yttrium fluoride are mixed ball milling, and rare earth refining agent is prepared;Aluminum, magnesium, aluminum-zinc intermediate alloy, aluminum-copper intermediate alloy are mixed and melted, aluminum-yttrium intermediate alloy and rare earth refining agent are added, and aluminum alloy material is prepared by pouring forming, annealing, hot forging, RRA heat treatment;With pretreated aluminum alloy material as anode, graphite as cathode, anodic oxidation in electrolyte, and corrosion-resistant high-strength aviation aluminum alloy material is prepared.The corrosion-resistant high-strength aviation aluminum alloy material prepared by the application has excellent corrosion resistance, high strength and fatigue resistance.

The invention relates to the technical field of nano luminescent materials, in particular to a rare earth ion doped sodium yttrium fluoride nano material as well as a preparation method and application thereof. The doping amount of ytterbium can influence the intensity of red light emitted by the nanometer material under the excitation of 1208 nm near-infrared light, the doping amount of thulium can influence the intensity of green light emitted by the nanometer material under the excitation of 1208 nm near-infrared light, the doping amount of holmium can influence the intensity of blue light emitted by the nanometer material under the excitation of 1208 nm near-infrared light, and by adjusting the doping amounts of ytterbium, thulium and holmium, the doping amount of the ytterbium, the doping amount of thulium and the doping amount of holmium can be adjusted. Further, the chromaticity diagram (CIE) coordinate position of the nano material is (0.3012, 0.3158), belongs to a white light range, and can be used for a white light LED device. In addition, the molar ratio of the yttrium source, the ytterbium source, the thulium source and the holmium source influences the light emitting color of the nanometer material under excitation of near-infrared light of 980 nm and 1208 nm, and therefore the nanometer material can be used for optical anti-counterfeiting.

The present disclosure provides a negative electrode active material for a fluoride ion secondary battery, the negative electrode active material comprising yttrium fluoride, the crystallite size in the negative electrode active material being greater than 7 nm and less than 27 nm. A fluoride ion secondary battery (10) according to the present disclosure is provided with a positive electrode (2), a negative electrode (4), and an electrolyte layer (3) disposed between the positive electrode (2) and the negative electrode (4), and the negative electrode (4) contains the negative electrode active material according to the present disclosure.

The invention discloses a high-transmittance calcium fluoride crystal impurity removal process, and belongs to the technical field of crystal impurity removal. The method comprises the following steps: mixing a calcium fluoride raw material with a modified deoxidant in an argon atmosphere by adopting a Bridgman-Stockbarger method, regulating and controlling the melting process of the calcium fluoride raw material through a gradient heating method, and finally obtaining the calcium fluoride crystal with high transmittance through descending crystallization and annealing. The modified deoxidant is of a three-layer core-shell structure of calcium, calcium fluoride and yttrium fluoride, calcium fluoride is subjected to in-situ conversion on the surfaces of metal calcium particles, then the calcium fluoride layer is etched through hydrofluoric acid, yttrium ions are adsorbed, finally, yttrium fluoride is generated on the surface of calcium fluoride in situ, and calcium, calcium fluoride and calcium fluoride core-shell particles are coated; according to the calcium fluoride high-temperature deoxygenization method, the calcium metal inside can be protected at low temperature, release of the calcium metal can be achieved at high temperature, deep deoxygenization is achieved in the calcium fluoride high-temperature melt, the optical performance of the crystal can be effectively improved, and the calcium fluoride crystal with high transmittance is obtained.

The preparation method of sodium yttrium fluoride modified polyetherimide-based composite dielectric film includes the following steps: Step 1, preparing a sodium yttrium fluoride solution and a diamine dispersion, and adding the sodium yttrium fluoride solution to the diamine dispersion; Step 2, adding bisphenol A type diether dianhydride in batches to the diamine dispersion to obtain a polyamic acid colloid; Step 3, vacuum-bubbling the polyamic acid colloid, then uniformly coating it onto a glass plate to form a composite film, removing the solvent from the film in a high-temperature oven, maintaining the temperature, and cooling to obtain the sodium yttrium fluoride modified polyetherimide-based composite dielectric film; Sodium yttrium fluoride comprehensively improves the dielectric and energy storage performance of PEI through multi-mechanism coupling of interfacial bonding, trap regulation, structural optimization, thermomechanical enhancement, and dielectric synergy, providing an effective path for the design of high-performance polymer dielectric materials.

The invention belongs to the technical field of ceramic material preparation, and discloses a preparation method of high-strength ceramic. According to the method, micron-sized silicon carbide and nano-sized aluminum oxide are used as basic ceramic phases, surface nickel-coated aluminum oxide microspheres are added as bionic toughening phases, and sintering aids such as a samarium fluoride-yttrium fluoride composite aid, nano molybdenum powder and the like, a specific forming and dispersing system and a defect control agent are matched; the high-strength ceramic is prepared through the steps of bionic composite slurry preparation, DLP photocuring forming, gradient degreasing and segmented pressureless sintering. The method can be used for preparing products with complex shapes, the obtained ceramic is high in density, high in bending strength and fracture toughness, excellent in corrosion resistance and thermal shock resistance and suitable for scenes such as wear-resistant parts and sealing parts of electromechanical petrochemical equipment, and the comprehensive performance of the ceramic can meet the requirements of severe working conditions.

This invention relates to the field of silicon carbide composite material technology, specifically to a carbon fiber-aluminum silicon carbide composite material and its preparation process. By weight, it comprises the following components: 70-80 parts silicon carbide powder, 3-10 parts modified short-cut carbon fibers, 1-2 parts yttrium fluoride powder, 3-6 parts ZIF-8 (2-methylimidazolium zinc MOF), 3-5 parts alumina powder, 2-6 parts polyglycidyl methacrylate, 15-20 parts ethanol, 1-2 parts bisphenol A epoxy resin, 25-35 parts molten aluminum, and deionized water. In this invention, silicon carbide is used as the basic raw material for ceramics. By adding ZIF-8 material, the porosity of the silicon carbide ceramic is adjusted, increasing its compatibility with other composite materials and leveraging the overall excellent performance of the silicon carbide additives. The resulting carbon fiber-aluminum silicon carbide composite material exhibits advantages such as high wear resistance, high elastic modulus, and high strength.

This thermal spray material including composite particles containing an yttrium oxide and an ammonium yttrium fluoride complex salt is used to form a thermal spray film comprising yttrium oxyfluoride formed by thermal-spraying in the air. When the thermal spray film is formed through thermal-spraying in the air by using the thermal spray material of the present invention, the loss of fluorine from the thermal spraying material during thermal-spraying is reduced, and a thermal spray film containing yttrium oxyfluoride can be formed by controlling a composition, so that a thermal spray film having a desired composition, particularly a desired F / Y, can be easily formed.

The present application relates to the technical field of ceramic coating preparation, and discloses an etching-resistant ceramic coating and a preparation method thereof. The method comprises the following steps: preparing a multicomponent composite ceramic powder based on yttrium oxide and yttrium fluoride and containing zirconium oxide and aluminum oxide according to phase equilibrium design; performing spray granulation treatment on the powder to obtain spherical feed powder with good fluidity; and preparing the feed powder into a coating by using a plasma spraying process. In the spray granulation step, the ceramic powder is mixed with deionized water, a dispersant and a binder to form a slurry, and the required powder is obtained through centrifugal spray drying and heat treatment. The spraying can be performed by using a supersonic atmospheric plasma spraying process or a suspension plasma spraying process. The present application stabilizes the phase composition of the coating material through phase equilibrium design, and obtains an etching-resistant ceramic coating which is phase-stable, dense and has high bonding strength by combining optimized granulation and spraying processes, and the coating is suitable for protection of semiconductor processing equipment.