39 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.

A nickel-hydrogen secondary battery (2) comprises an outer can (10) and an electrode group (22) housed in the outer can (10) together with an alkaline electrolyte. The electrode group (22) is formed by overlapping a positive electrode (24) containing a positive electrode mixture and a negative electrode (26) containing a negative electrode mixture via a separator (28). The positive electrode mixture comprises nickel hydroxide solid-dissolved with zinc as a positive electrode active material and zinc oxide as a positive electrode additive. The negative electrode mixture comprises hydrogen storage alloy particles and a negative electrode additive. The negative electrode additive is a composite of yttrium fluoride loaded on carbon black, and the composite covers a portion of the surface of the hydrogen storage alloy particles.

The application provides a composite ceramic coating spraying processing device, which can form an alumina coating and a silicon oxide coating through first spraying, can form an aluminum fluoride coating through second spraying, and can form a yttrium fluoride coating through third spraying; the three layers of coatings are sequentially distributed from inside to outside, forming a plasma-resistant ceramic coating with a multilayer composite structure, which enriches the structure of the composite ceramic coating and improves the overall protection capability against plasma etching, so that safety accidents can be avoided. The application solves the problems of single structure and poor protection capability of the traditional composite ceramic coating.

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.

The invention discloses fluoride nanocrystalline glass ceramic containing a Pb4Y3F17 crystal phase. The fluoride nanocrystalline glass ceramic is prepared from the following raw material components in percentage by mole: 30 to 35 mol percent of AlF3, 10 to 15 mol percent of BaF2, 10 to 25 mol percent of YF3, 25 to 30 mol percent of PbF2, 8 to 12 mol percent of MgF2 and 1 to 15 mol percent of HoF3, the fluoride nanocrystalline glass ceramic containing the Pb4Y3F17 crystal phase is prepared by the following steps: obtaining a fluoroaluminate glass precursor by adopting a melting quenching method, and then preparing the fluoride nanocrystalline glass ceramic by utilizing a heat treatment method. The invention also discloses a preparation method of the fluoride nanocrystalline glass ceramic containing the Pb4Y3F17 crystal phase. According to the invention, the Pb4Y3F17 crystal with a single crystal phase is separated out from fluoroaluminate glass, so that a crystal field environment which is more stable for the luminescence characteristic of rare earth elements is obtained.

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.

A negative electrode for an alkaline storage battery that achieves both an improvement in cycle life and an improvement in low temperature discharge characteristics, and an alkaline storage battery including the negative electrode are disclosed. The negative electrode for an alkaline storage battery includes a negative electrode core body formed of metal, and a negative electrode mixture layer which contains at least a hydrogen storage alloy and yttrium fluoride, and is carried on the negative electrode core body. Particles of the yttrium fluoride are formed so that the average particle size thereof is equal to 1 μm or more and 7 μm or less.

The present technology generally relates to semiconductor processing systems and methods. Systems and methods include a chamber having a plurality of chamber components, such as a susceptor, a lid stack, a panel, an electrode, and a showerhead. The panel is supported by the cover stack and defines a plurality of first apertures, and the showerhead is located between the panel and the base and defines a plurality of second apertures. In systems and methods, the panel, showerhead, cover stack, susceptor, or a combination thereof includes a coating of yttrium fluoride, yttrium oxyfluoride, or yttrium fluoride and yttrium oxyfluoride having a thickness greater than 10 [mu] m over at least a portion of the individual chamber components, or a combination thereof.

An embodiment of the present invention provides a method for manufacturing a coating layer, comprising the steps of: preparing an object to be coated; forming, on the object to be coated, an aluminum oxide-based, yttrium oxide-based or zirconium oxide-based first coating layer by means of aerosol deposition; and forming, on the first coating layer, an aluminum oxide-based, yttrium oxide-based or yttrium fluoride-based second coating layer by means of physical vapor deposition, wherein the second coating layer includes an array of columnar crystals that extend perpendicularly to the surface of the object to be coated.

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.

The invention belongs to the field of new materials, and discloses an aluminum oxide ceramic with a low thermal expansion coefficient, which is prepared by sintering the following raw materials: 98.5-99.1 wt% of aluminum oxide; 0.15 to 0.25 wt% of silicon powder; 0.15 to 0.25 wt% of magnesium oxide; 0.15 to 0.25 wt% of yttrium fluoride; and 0.25 to 0.75 wt% of fused crystal beta-cristobalite. According to the product, the four elements of Al, Si, Mg and Y form a quaternary system ceramic formula, the requirement of the market for the low thermal expansion coefficient of the 99 aluminum oxide ceramic product is met, and the application value of the 99 aluminum oxide ceramic in a ceramic substrate and an electrostatic chuck is greatly improved. Meanwhile, the invention further discloses a preparation method of the aluminum oxide ceramic.

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.

A dual-mode immunoassay structure includes a titanium carbide / molybdenum disulfide composite immunoassay substrate and a NaYF4:Yb,Er immunoprobe, wherein the NaYF4:Yb, Er comprises 78% Y, 20% Yb, and 2% Er. The method of preparation includes the steps of: (S10) preparing titanium carbide powder via an acid-etching method; (S20) fabricating the titanium carbide / molybdenum disulfide composite immunoassay substrate; and (S30) preparing the NaYF4:Yb,Er immunoprobe. The dual-mode immunoassay structure is suitable for use in the detection of prostate cancer, providing both Surface-Enhanced Raman Scattering (SERS) and upconversion luminescence signals for analysis, rendering it applicable for clinical diagnostics.

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.

A hydrogen absorbing alloy negative electrode is provided. The hydrogen absorbing alloy negative electrode has a hydrogen absorbing alloy, and an additive including yttrium fluoride. A mass of the yttrium fluoride is 0.1 parts by mass or more and 0.2 parts by mass or less based on a hydrogen absorbing alloy powder of 100 parts by mass.