23 results about "Barium fluoride" patented technology

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

The invention discloses a hydrogenation catalyst which is a supported catalyst, the catalyst is in a particle shape, the particles are porous metal fluoride embedded with palladium element, the porous metal fluoride is selected from one or more of aluminum fluoride, chromium fluoride, magnesium fluoride, barium fluoride, calcium fluoride, aluminum fluoride oxide and chromium fluoride oxide, and the palladium element is one or more of aluminum fluoride, chromium fluoride, magnesium fluoride, barium fluoride, calcium fluoride, aluminum fluoride oxide and chromium fluoride oxide. The invention also provides a preparation method of the catalyst. According to the catalyst prepared by the method, the synthesis yield and conversion rate are high in the process of synthesizing HFC-236ea from C3F6 and synthesizing HFC-245eb from HFO-1225ye, and the product purity and yield are excellent. According to the catalyst used in the invention, aluminum oxyfluoride is used as a carrier of metal palladium, Pd particles and a carrier interface are tightly combined, and a falling sign does not appear, so that the Pd component is excellent in dispersity, and the reaction rate and the raw material conversion rate are favorably improved.

This invention discloses a mid-to-far-infrared ultra-wideband neutral beamsplitter based on KBr crystal, its fabrication method, and its applications, relating to the field of optical thin film technology. The KBr crystal-based mid-to-far-infrared ultra-wideband neutral beamsplitter includes a KBr crystal substrate; a front surface adhesive layer disposed on the front surface of the KBr crystal substrate; an ultra-wideband neutral beam splitter disposed on the surface of the front surface adhesive layer; a rear surface adhesive layer disposed on the rear surface of the KBr crystal substrate; and an ultra-wideband protective film disposed on the surface of the rear surface adhesive layer. The front and rear surface adhesive layers are both magnesium fluoride thin films; the ultra-wideband neutral beam splitter has a multilayer dielectric film structure; and the ultra-wideband protective film is a barium fluoride thin film. This invention innovatively introduces a double-sided composite thin film structure of "front surface adhesive layer + beam splitter system" and "rear surface adhesive layer + protective layer".

The invention belongs to the field of rare earth afterglow luminescent materials. The invention discloses a high-brightness divalent rare earth afterglow material. The molecular formula of the high-brightness divalent rare earth afterglow material is BaFCl: Gd / Li / Sm. The preparation method sequentially comprises the following steps: uniformly mixing and grinding barium fluoride, barium chloride, gadolinium chloride, samarium chloride and lithium chloride in proportion, carrying out high-temperature reaction in a tubular furnace, and carrying out heat preservation in a drying oven to obtain a product. The product has the characteristics that the product has very strong afterglow performance under X-ray excitation, the afterglow luminescence brightness value can reach 4.53 cd m <-2 >, the afterglow duration is longer than 100 hours, and the product has a very good application prospect in the field of delayed X-ray imaging.

The invention belongs to the technical field of semiconductor material preparation, and relates to a multi-element oxide film and a preparation method and application thereof. The technical problem that in the prior art, large-area uniform preparation of a multi-element oxide film is difficult is solved. The invention provides a preparation method of a multi-element oxide thin film, which adopts molecular beam epitaxy co-evaporation preparation and comprises the following steps: placing a substrate in a molecular beam epitaxy co-evaporation preparation cavity, and vacuumizing the cavity; performing YSZ buffer layer deposition and CeO2 buffer layer deposition on the substrate in the cavity from bottom to top in sequence, and controlling automatic evaporation of electron beams through a film thickness gauge to obtain a substrate containing a buffer layer; yttrium, copper and barium fluoride are co-evaporated on a substrate containing a buffer layer to perform YBCO film deposition, a Y evaporation source, a Cu evaporation source and a Ba evaporation source are controlled by a film thickness gauge to perform co-evaporation, and a multi-element oxide film with large area and good uniformity is obtained. The invention further provides the multi-element oxide thin film and application thereof.

The application discloses fine-grained steel SAW fluorine alkali type sintered flux and application, including barium fluoride 28-33%, aluminum ash powder 10-12%, dolomite 5-7%, pre-melted slag powder 25-27%, fluorocarbon cerium ore 2-3%, titanium boron iron 1.5-2.5%, kaolin 6-8%, magnesite 4-6%, silicon calcium aluminum powder 10-13% by weight percentage. The application can meet the submerged arc welding requirement of 65kg grade structural steel in most cases, has good welding process and mechanical properties of post-welding deposited metal, is widely applied in the construction, machinery and other industries, and greatly improves the production and life efficiency of people.

This invention discloses a narrowband polarization metasurface for suppressing long-wave infrared angular dispersion and its fabrication method, relating to the field of optical component technology. Addressing the problems of difficult fabrication and strong angular dispersion inherent in existing polarizers, the metasurface of this invention comprises a barium fluoride substrate and a double-layer composite grating structure disposed on its surface. The composite grating includes a bottom arsenic selenide grating and a top metal layer. By limiting the period of the composite grating to 5.5-6.25 micrometers and the width of a single double-layer grating structure to 4.5-5.5 micrometers, the downward-leaking guided modes and Fabry-Perot cavity modes within the structure undergo strong compression in momentum space, resulting in band folding and anti-crossing flat-band effects. This invention not only relaxes the feature size to the micrometer level, significantly reducing fabrication difficulty, but also fundamentally suppresses the strong angular dispersion of plasmon resonance in narrowband, achieving a high polarization extinction ratio under large angle tolerance and greatly reducing the collimation requirements of practical optical paths.

The invention discloses an electrolyte for low-temperature aluminum electrolysis and a preparation method thereof, and belongs to the technical field of electrolytes for aluminum electrolysis. The technical problems of high electrolysis temperature and large volatilization caused by high primary crystal temperature of the existing electrolyte for aluminum electrolysis are solved. The invention provides an electrolyte for low-temperature aluminum electrolysis and a preparation method thereof, and the electrolyte for low-temperature aluminum electrolysis comprises the following components in percentage by weight: 15 to 25 percent of sodium fluoride NaF, 14 to 29 percent of potassium fluoride KF, 0.1 to 4 percent of barium fluoride BaF2, 0.5 to 5 percent of aluminum oxide Al2O3, and the balance of AlF3 and inevitable impurities. According to the electrolyte for low-temperature aluminum electrolysis, the primary crystal temperature is reduced by adjusting an electrolyte system, so that the electrolysis temperature is reduced, and fluoride volatilization is reduced.

The invention provides a zirconium-aluminum non-reaction drainage agent and a preparation method thereof, and belongs to the technical field of metallurgical auxiliary materials. The zirconium-aluminum non-reaction drainage agent is prepared from the following raw materials in parts by weight: 10 to 70 parts of fused alumina zirconia, 10 to 46 parts of white corundum, 18 to 78 parts of sintered zirconium dioxide, 1 to 5 parts of barium fluoride and 1 to 6 parts of graphite colloidal dispersion liquid. The drainage agent is low in silicon and free of chromium, does not react with alloy elements such as aluminum, titanium and manganese, is high in refractoriness and permeation resistance, and can guarantee good self-opening rate and molten steel purity.

The invention discloses a preparation method of high-purity electronic-grade hydrofluoric acid, and particularly relates to a preparation method of electronic-grade hydrofluoric acid, which comprises the following steps: in the presence of villiaumite, carrying out impurity removal reaction on industrial hydrogen fluoride, and then purifying the obtained mixed solution to obtain the electronic-grade hydrofluoric acid, the villiaumite comprises cobalt trifluoride and barium fluoride. The preparation method is mild in reaction, low in production energy consumption, easy to operate and control and capable of solving the problem of pollution caused by oxidant pulverization. And the adopted villiaumite can be reused after being fluorinated for multiple times, so that the use is safe, and the purification effect is good.

The invention belongs to the technical field of welding materials, and particularly provides a nickel-based welding material welding flux which comprises, by mass, 20%-40% of fluorite, 10%-20% of quartz, 15%-30% of aluminum oxide, 5%-15% of magnesium oxide, 2%-7% of sodium fluoride, 5%-15% of calcium oxide, 1%-5% of barium fluoride and 3%-9% of silicon-manganese alloy. The welding flux for the nickel-based welding material is low-hydrogen fluorine-alkali type welding flux, the welding process performance is excellent, electric arcs are stable during welding, after welding is completed, welding slag and weld metal are automatically separated, upwarp and fall off, a weld joint is attractive in forming, the surface is bright, welding lines are fine, and the welding flux is suitable for alternating-current and direct-current flat welding and horizontal welding; and a weld joint has good ultralow-temperature (-196 DEG C) impact toughness, low cold and hot crack sensitivity, high yield strength and tensile strength, high ductility and excellent welding process performance.

The application provides a wear-resistant and friction-reducing titanium alloy coating and a preparation method, and relates to the technical field of wear-resistant and friction-reducing coatings.The wear-resistant and friction-reducing titanium alloy coating is composed of a matrix phase, a reinforcing phase and a lubricating phase.The matrix phase is a titanium alloy.The lubricating phase is one of silver, hexagonal boron nitride and barium fluoride.The reinforcing phase is a combination of cubic boron nitride ceramic particles and a hard phase.The hard phase is TiN, TiB and Ti2Ni.The wear-resistant and friction-reducing titanium alloy coating has excellent wear-resistant and friction-reducing performance, can play a good protective role on the surface of the matrix at room temperature, and effectively improves the service life of the matrix.

A mold flux for the continuous casting of large-strand ultra-high carbon wear-resistant ball steel and a preparation method therefor. ‌The mold flux is prepared from the following raw materials in parts by weight: 15-28 parts of wollastonite powder, 20-40 parts of an electrically fused pre-melted slag, 3-6 parts of lithium metaborate, 2-8 parts of borosilicate glass, 2-4 parts of sodium fluoride, 5-13 parts of sodium carbonate, 2-7 parts of barium fluoride, 7-11 parts of fluorite powder, 2-5 parts of electrode graphite, 2-5 parts of high-carbon amorphous graphite, 2-4 parts of N660 carbon black and 2-4 parts of dextrin. The mold flux has a relatively low viscosity, a relatively low melting point and a relatively high basicity, improves the lubrication effect on a casting blank, enhances the ability to absorb floating inclusions in the molten steel, reduces the incidence of cracks on the casting blank surface and the occurrence of breakouts, improves the surface and subsurface quality of the casting blank, and increases the production efficiency of continuous casting. The mold flux is particularly suitable for the continuous casting production of large-strand ultra-high carbon wear-resistant ball steel.

The application belongs to the technical field of semiconductor material preparation, and relates to a multi-element oxide film and a preparation method and application thereof. In view of the technical problem that the multi-element oxide film is difficult to be prepared uniformly in a large area in the prior art, the application provides a preparation method of the multi-element oxide film, which is prepared by molecular beam epitaxy co-evaporation and comprises the following steps: placing a substrate in a molecular beam epitaxy co-evaporation preparation cavity, and vacuumizing the cavity; sequentially depositing a YSZ buffer layer and a CeO2 buffer layer from bottom to top in the cavity, and obtaining a substrate containing the buffer layers by controlling electron beam automatic evaporation through a film thickness gauge; depositing a YBCO film on the substrate containing the buffer layers by co-evaporating yttrium, copper and barium fluoride, and obtaining a multi-element oxide film with good large-area uniformity by co-evaporating the Y evaporation source, the Cu evaporation source and the Ba evaporation source through the film thickness gauge. The application further provides the multi-element oxide film and application thereof.

The invention discloses plastic capable of transmitting infrared light and a preparation method thereof, and belongs to the field of high polymer material engineering. The plastic capable of transmitting infrared light, prepared by the invention, comprises the following raw material components in parts by mass: 100 parts of carrier resin, 20-30 parts of modified infrared transparent filler and 1-2 parts of auxiliaries, wherein the carrier resin is obtained by crosslinking an ethylene-vinyl acetate copolymer, polyethylene and vinyl cyclosiloxane; the vinyl cyclosiloxane comprises 1, 3, 5-trivinyl-1, 3, 5-trimethyl cyclotrisiloxane and tetramethyl tetravinyl cyclotetrasiloxane, and the vinyl cyclosiloxane comprises 1, 3, 5-trivinyl-1, 3, 5-trimethyl cyclotrisiloxane and tetramethyl tetravinyl The modified infrared transparent filler is obtained by modifying the infrared transparent filler with 1, 1, 3, 3-tetramethoxy-1, 3-dimethyl disiloxane; the infrared transparent filler is obtained by compounding barium fluoride and magnesium fluoride; the plastic capable of transmitting infrared light, prepared by the invention, is relatively good in mechanical property and high in infrared transmittance.

The application provides a self-protection flux-cored wire and a preparation process thereof, and relates to the technical field of welding materials. The self-protection flux-cored wire comprises a steel belt sheath, a flux material and a fluorinated graphene coating. The flux material is filled in the steel belt sheath, and the fluorinated graphene coating is coated on the outer surface of the steel belt sheath. The flux material comprises the following raw materials in terms of mass percentage: 30-50% of atomized iron powder, 18-35% of barium fluoride, 10-20% of aluminum-magnesium alloy, 10-20% of aluminum powder, 3-8% of metallic manganese, 2-5% of silicon iron, 1-3% of silicon-calcium alloy, 2-5% of wollastonite, 1-3% of fluorite, 0.5-2% of potassium fluosilicate, 1-5% of lithium fluoride and 1-3% of nickel powder. The self-protection flux-cored wire can be used for all-position welding without gas protection, has low porosity sensitivity, and the fluorinated graphene coating can effectively prevent the invasion of moisture in the air, so that the self-protection flux-cored wire is easier to store without affecting the welding performance.

The application belongs to the technical field of additive manufacturing, and particularly relates to an inner hole laser cladding composite powder material and a preparation method thereof. In order to solve the problems of poor uniformity and flowability of the inner hole laser cladding composite powder material in the prior art and the limitations in hardness, wear resistance and corrosion resistance, the application provides an inner hole laser cladding composite powder material and a preparation method thereof. The material comprises tungsten carbide powder, NiCr alloy powder, silver and a mixed crystal of calcium fluoride and barium fluoride, is mixed and ball milled, is pre-sintered and then ball milled again, is then subjected to gas atomization treatment and laser pretreatment, and finally a nickel plating layer is formed on the surface of the powder through chemical plating. The composite powder material has high hardness, high wear resistance, good corrosion resistance and high temperature stability, is suitable for inner hole laser cladding, and significantly improves the service life and performance of a workpiece.

The invention relates to the technical field of artificial crystal growth, and discloses a large-size barium fluoride single crystal pulling growth device and method.The device comprises a pulling furnace body, a novel furnace body bell jar, a dynamic gas-pressure control system, a heat preservation system and a pulling mechanism; a novel furnace body bell jar is integrated with an automatic argon flow control device, a vacuum pump connector working in the whole process and a volatile matter prevention observation window, a dynamic gas-pressure control system adjusts the argon flow and the pressure of a furnace cavity through PLC linkage, and fluorine ions are removed in real time; and the composite protective thermal insulation layer can resist fluorine ion corrosion. And through parameter cooperation of heating, welding, pulling, equal diameter and cooling, the crystal quality is improved, the cost is reduced, and the method is suitable for large-scale preparation of large-size single crystals.

The invention discloses a method for preparing spherical nano barium fluoride, spherical barium fluoride smaller than 5nm is synthesized by a microemulsion reaction method, and the microemulsion is temperature-responsive and does not contain a surfactant. Controllable preparation of the spherical barium fluoride with the ultra-small size smaller than 5 nm under the surfactant-free condition is achieved for the first time. A ternary surfactant-free microemulsion system composed of diethylene glycol monohexyl ether, octane and water is constructed, the amphiphilic solvent characteristic of diethylene glycol monohexyl ether is used for replacing a traditional surfactant, and the dependence of an existing template method on the surfactant is successfully broken through. The particle size of the obtained BaF2 product is only smaller than 5 nm and enters a strong quantum confinement scale range, and the preparation blank of a barium fluoride material in the field of sub-5-nm ultra-small solid spheres is filled.

To provide an optical waveguide device in the field of mid-infrared photonics and a method for manufacturing such a device.SOLUTION: The device comprises a fluoride glass substrate having a local concentration of a chemical element at an internal contact and a waveguide inscribed along a path defined in the substrate. The waveguide is formed by directing a focused ultra-short laser pulse into the substrate and scanning the pulse to induce migration and densification of chemical elements at the inner contacts, resulting in a positive refractive index contrast. Fluoride glass substrates can include zirconium fluoride and modifiers such as barium fluoride, aluminum fluoride, and rare earth elements to enable optical gain. The described technology further encompasses an integrated photonics device including a waveguide laser with mirrors and gratings defining a laser cavity for use in sensing, communications, and laser systems.SELECTED DRAWING: Figure 1

The invention discloses a continuous preparation method of an acyl fluoride compound, according to the continuous preparation method, in the presence of a catalyst, perfluoroolefin with a general formula of R1R2C = CR3R4 and carbonyl fluoride are subjected to an addition reaction to prepare the acyl fluoride compound with a general formula of CFR3R4-CR1R2-COF, R1, R2, R3 and R4 are independently selected from CnF2n + 1, and n is 0-6; the catalyst is a non-loaded body porous catalyst and consists of bicarbonate and hydrofluoride, and the bicarbonate is selected from one or more of lithium bicarbonate, sodium bicarbonate, potassium bicarbonate, cesium bicarbonate, magnesium bicarbonate, calcium bicarbonate, strontium bicarbonate and barium bicarbonate; the hydrogen fluoride salt is selected from one or more of lithium fluoride, sodium fluoride, potassium fluoride, cesium fluoride, magnesium fluoride, calcium fluoride, strontium fluoride and barium fluoride; the mass percentage ratio of the bicarbonate to the hydrofluoride is (0-60%): (40-100%). The method is mild in continuous reaction condition, easy to operate, almost free of byproducts and suitable for continuous production.

This invention provides a high-entropy alloy high-temperature self-lubricating spherical plain bearing, belonging to the field of spherical plain bearing technology. The high-entropy alloy high-temperature self-lubricating spherical plain bearing includes an inner ring and an outer ring. The inner ring is made of a high-entropy alloy, and the outer ring is made of a high-temperature alloy. The outer spherical surface of the inner ring has several blind holes filled with a composite solid lubricant and a binder. The binder is aluminum chromium phosphate or zirconium silicate; the composite solid lubricant is a combination of barium fluoride, calcium fluoride, silver, hexagonal boron nitride, graphite, molybdenum disulfide, tungsten disulfide, and lead oxide. The self-lubricating spherical plain bearing provided by this invention has high reliability, excellent high-temperature load-bearing capacity and high-temperature friction and wear performance, and can be used up to 900℃. It can meet the requirements of harsh working conditions such as high temperature and heavy load, and has good application prospects in aviation, aerospace, weaponry, and equipment manufacturing.

The present disclosure relates to an optical waveguide device and a method for fabricating such a device in the field of mid-infrared photonics. The device comprises a fluoride glass substrate having localized concentrations of a chemical element at inscription points, with a waveguide inscribed along a defined path within the substrate. The waveguide is formed by directing focused ultrashort laser pulses into the substrate and scanning the pulses to induce migration and densification of the chemical element at the inscription points, resulting in a positive refractive index contrast. The fluoride glass substrate may include zirconium fluoride and modifiers such as barium fluoride, aluminium fluoride, and rare-earth elements to enable optical gain. The described technology further encompasses integrated photonic devices, including waveguide lasers comprising mirrors and gratings that define a lasing cavity for use in sensing, communication, and laser systems.