30results about How to "Improves ingredient uniformity" patented technology

The invention discloses a medium and low temperature organic sulfur hydrolytic agent applied to coal gas dry purification and a preparation method thereof, and relates to the technical field of coal gas purification and industrial catalysis, the hydrolytic agent comprises the following components: gamma-Al203, pseudo-boehmite, a pore forming agent, an active agent, an auxiliary agent, an adhesive and water. According to the medium-low temperature organic sulfur hydrolytic agent applied to dry purification of coal gas and the preparation method thereof, an alkali metal element is adopted as an active agent, and the characteristic that the alkali metal element can provide a large number of alkaline reaction sites is utilized, so that organic sulfur molecules are promoted to be preferentially adsorbed with the hydrolytic agent to generate hydrolysis reaction; meanwhile, sodium metavanadate is added as an active auxiliary agent, so that the low-temperature activity of the hydrolysis catalyst is further optimized.

The invention discloses a method for achieving titanium-aluminum alloy additive manufacturing through an electron beam spot melting process. The method comprises the steps that firstly, after a three-dimensional CAD model of a target product is established, layering slicing is conducted; 2, preheating and heat preservation of the substrate; 3, spreading powder and preheating a powder bed; 4, additive manufacturing process parameters are set, powder melting and solidification are carried out point by point, and a single-layer solid sheet layer is obtained; 5, carrying out secondary preheating treatment on the powder bed and descending the forming platform; and 6, repeating the process to obtain the titanium-aluminum alloy. A discrete point melting technology is adopted to replace a traditional line scanning continuous melting technology, point melting and solidification are carried out on a target area in a powder bed one by one, the size of a molten pool is reduced, the cooling speed of the molten pool is increased, the heat affected zone range of the edge of the molten pool is reduced, the influence time of the heat affected zone is shortened, and the uneven structure caused by aluminum element volatilization and phase change is avoided; and meanwhile, single-process printing of the titanium-aluminum alloy complex part is achieved, the difficulty and cost of the additive manufacturing process are reduced, and the method is suitable for the field of titanium-aluminum alloy additive manufacturing.

The invention discloses a method for growing tellurium-indium-lead single crystals with low optical absorption and high uniformity by reducing gravity influence, and relates to a growth method of tellurium-indium-lead single crystals. The method aims at solving the problems that according to an existing PIT crystal growth method, crystal cracking is serious, optical absorption is high, and elements in crystals are not evenly distributed. The method comprises the following steps: putting a Pb source, an In source, a Te source and extra In2Te3 into a cylindrical crucible, adding elemental Te into a quartz tube, and melting and sealing; putting the quartz tube into an inclined single-temperature-zone tubular furnace for reaction to obtain PIT polycrystals, then putting the polycrystals into a pyrolytic boron nitride crucible with a seed crystal trap, putting the pyrolytic boron nitride crucible into the quartz tube, and performing vacuum sealing; and performing single crystal growth in a multi-temperature-zone horizontal crystal growth furnace to obtain the PIT single crystal. The transmittance of the cut double-sided polished wafer with the thickness of 6 mm is close to 60% within the wave band of 2-3 microns, the optical absorption at the position of 2.09 microns is smaller than 0.11 cm <-1 >, and the double-sided polished wafer can be applied to the fields of industry, medical treatment and energy.

The invention discloses a method for preparing a baking-free brick by co-grinding mineral powder and high-water-content sand washing mud, which specifically comprises the following steps: (1) conveying the high-water-content sand washing mud into ball milling equipment, and adding the mineral powder and a drag reducer; (2) adding a curing agent and fine aggregate into the wet-ground slurry, and carrying out homogenization treatment by using forced mixing and stirring equipment; and (3) carrying out extrusion forming on the homogenized slurry, and curing to obtain the sand washing mud-based baking-free brick. The baking-free brick is prepared from the mineral powder and the high-water-content sand washing mud through common wet grinding treatment, the raw material source is wide, and the preparation process is simple; meanwhile, the repeated step of dewatering first and then adding water and resource waste are avoided, and the environment is protected while the cost is saved.

The invention discloses a continuous casting device and method for manganese-series iron alloy, and the continuous casting device comprises a casting ladle, a crystallizer arranged below the casting ladle, a tundish arranged between the casting ladle and the crystallizer, a transportation mechanism arranged on one side of the crystallizer, and a throwing machine arranged between the crystallizer and the transportation mechanism. The collecting box is arranged on the side, away from the throwing machine, of the conveying mechanism, the cutting mechanism is arranged between the conveying mechanism and the throwing machine, a vibration mechanism and a liquid cooling unit are arranged on the crystallizer, and an air cooling unit is arranged at the top of the conveying mechanism; the ferromanganese alloy is prepared through the continuous casting process, the ferromanganese liquid only needs 50-60 s from casting to solidification, rapid solidification is achieved, the uniformity of components of the ferromanganese alloy is greatly improved, the product quality is improved, the related ferromanganese continuous casting process continuously produces casting blanks from the liquid ferromanganese liquid, the working procedures of water spraying cooling and jaw breaking are reduced, the production period is shortened, and the production cost is reduced. Manpower and equipment investment is saved, and the production efficiency is improved.

The invention provides a preparation method of a high-damping titanium alloy ultrafine wire difficult to machine and deform. The preparation method comprises the following steps: (1) smelting a cast ingot; (2) homogenization treatment; (3) forging treatment; (4) groove rolling; (5) cold drawing processing; and (6) annealing treatment. The high-oxygen-content damping titanium alloy is reasonable in conception, and the machining deformation capacity of the high-oxygen-content damping titanium alloy is improved through a component micro-control and heterogeneous structure toughening technology; and by combining the traditional preparation and processing technology of the titanium alloy wire, the difficulty and threshold of material preparation are reduced, the problem of preparation and processing of the high-oxygen-content damping titanium alloy ultrafine wire is solved, and the method is suitable for large-scale production, popularization and application of fasteners, elastic components and the like.

The invention discloses a preparation method of an ultra-pure nickel-titanium alloy thin-wall pipe for a heart valve. The method comprises the following steps: 1, preparing materials, and carrying out magnetic suspension induction melting to obtain a cast ingot; 2, gradually performing hot forging and rolling on the cast ingot to obtain a round bar; thirdly, the round bar is manufactured into a pipe blank, honing and polishing are conducted, and the nickel-titanium pipe is obtained; 4, assembling the nickel-titanium pipe into the titanium pipe to obtain a combined pipe; 5, heat treatment of the combined pipe; 6, three-roller precise cold rolling; 7, repeating to obtain a pipe semi-finished product; and 8, straightening and cylindrical grinding are performed to remove the titanium pipe. According to the method, the high-purity nickel-titanium alloy cast ingot is prepared through magnetic suspension induction melting, the outer-layer titanium pipe and the inner-layer nickel-titanium pipe are introduced to be assembled, the pass deformation is increased through the restraining and protecting effects of the titanium pipes, the number of times of rolling and heat treatment is reduced, and the machining period is shortened; the obtained ultra-pure nickel-titanium alloy thin-wall pipe is high in purity, high in size precision, good in surface quality, high in wall thickness uniformity and good in comprehensive mechanical property and is suitable for the field of heart valves.

The invention belongs to the technical field of non-ferrous metal material processing, and particularly discloses a Ti575G titanium alloy bar and a preparation method and application thereof.The preparation method comprises the technological route of cogging forging, intermediate forging and forming forging, firstly, a large deformation technology above a phase transformation point is adopted, the thermal diffusivity of atoms under the high-temperature condition is fully utilized, and the thermal diffusivity of the atoms under the high-temperature condition is utilized; according to the method, the component and structure uniformity of a blank is greatly improved, then a repeated upsetting and drawing deformation mode is applied in a two-phase region, and meanwhile, the deformation uniformity of all positions of a bar is effectively improved by strictly controlling the temperature, the heat preservation time, upsetting and drawing deformation parameters and the like of each stage. The Ti575G bar prepared by the preparation method disclosed by the invention is uniform in component and structure, has matched strong plasticity and impact toughness characteristics, can completely meet strict requirements of wings, fuselage frames, undercarriages and weapon barrels of airplanes on the alloy bar, and is very suitable for industrial large-scale production.

This invention discloses a method for preparing high-purity oxygen-free copper, relating to the field of metallurgical technology. The method includes multi-stage electrolytic refining, gradient-heating vacuum melting, inert gas-protected refining, electron beam melting, hydrogen plasma arc melting, directional solidification, and post-treatment steps. The multi-stage electrolytic refining utilizes a specific component electrolyte and periodically commutated current; vacuum melting is combined with bidirectional electromagnetic stirring; inert gas-protected refining is combined with a gradient reduction composite covering agent; electron beam and hydrogen plasma arc melting achieve deep purification and deoxidation; and directional solidification and two-stage annealing ensure product performance. The high-purity oxygen-free copper prepared by this invention has a conductivity of 102.3% IACS, a copper content ≥99.9999%, and an oxygen content <1.0 ppm. It exhibits high purity, low oxygen content, and excellent conductivity. The process is stable and controllable, making it suitable for high-end electronics applications.

The invention discloses an indium-silver alloy and a preparation method and application thereof, and relates to the technical field of precious metal material manufacturing. The preparation method of the indium-silver alloy comprises the following steps: S1. heating and melting raw materials indium and raw materials silver respectively to obtain molten indium and molten silver; S2. pouring the molten silver obtained in step S1 into the molten indium obtained in step S1 and uniformly mixing them into an alloy melt; S3. cooling and solidifying the alloy melt obtained in step S2; S4. heating and melting the solidified alloy obtained in step S3 under a vacuum environment and keeping the temperature to obtain an alloy melt again, and cooling to obtain an indium-silver alloy. The present invention does not require heating all raw materials to a high temperature to uniformly disperse silver in an indium matrix, thereby reducing material loss caused by volatilization and oxidation. By repeatedly melting the alloy in a vacuum at a relatively low temperature, on the one hand, gas inclusions in the alloy are reduced and the alloy composition is made uniform, and on the other hand, the volatilization of indium in the degassing process is reduced.

The invention discloses a tungsten alloy preparation method based on multi-element doping and wet ball-milling mixing, and relates to the technical field of powder metallurgy. The method comprises the following steps: weighing tungsten trioxide powder, nickel oxide powder and ferric oxide powder in proportion, and adding an isopropanol solvent for wet ball milling to obtain original slurry; carrying out ball material separation and drying on the original slurry, and fully reducing by using hydrogen to obtain W-Ni-Fe composite powder; multiple elements are doped in the W-Ni-Fe composite powder for secondary material mixing, and multi-element doped mixed powder is obtained; the multi-element doped mixed powder is put into a rubber sleeve and then subjected to cold isostatic pressing, and a W-Ni-Fe alloy bar blank is obtained; and the W-Ni-Fe alloy bar blank is subjected to sintering and vacuum annealing, and the W-Ni-Fe alloy is obtained. According to the embodiment of the invention, the problem that the raw material powder is difficult to mix uniformly in the dry mixing process is solved, and the distribution uniformity of Ni, Fe and doped elements in the multi-element doped mixed powder is improved.

A high-alloy steel electroslag ingot and its homogenization method are provided, comprising the following steps: S1, electroslag ingot pretreatment: removing surface oxide scale and crack defects, and grinding to a surface roughness Ra≤6.3μm; S2, staged heating: heating to 800-900℃ at a rate ≤100℃ / h and holding for 2-6h; heating to 1000-1100℃ at a rate ≤100℃ / h and holding for 2-6h; heating to 1200-1300℃ at a rate ≤150℃ / h and holding for 10h. -20h; S3, Stepped cooling: Turn off the heating device and cool with the furnace to 800-1000℃, hold for 2-6h; cool to 500-650℃ at a rate of ≤50℃ / h, hold for 2-6h; open the furnace door and introduce cooling air at a speed of 0.5-3m / s to cool to room temperature, obtaining homogenized high-alloy steel electroslag ingots; S4, Post-homogenization testing: the relative standard deviation of each alloying element is ≤5%; the average grain size is ≤10μm; the Brinell hardness fluctuation range is ≤15HBW. This invention eliminates component segregation, refines grain structure, optimizes process parameters, is highly efficient and energy-saving, easy to promote, and has strong practicality.

The invention provides a preparation method of a high-uniformity titanium alloy consumable electrode, which comprises the following steps: taking sponge titanium, high-purity metal, intermediate alloy and residual titanium scraps as raw materials, and weighing the raw materials with required weight according to alloy components; the raw materials are sequentially laid on an electrode pressing mold layer by layer according to the particle size from large to small, one-time pressing is carried out after one-time laying and distribution of all the raw materials are completed, and the steps are repeated till an electrode block is formed after multiple times of pressing; and the multiple electrode blocks are subjected to vacuum plasma assembly welding treatment in a vacuum welding box, and the complete consumable electrode is obtained. The raw materials are uniformly laid and distributed layer by layer and then are directly pressed, each electrode block is formed by multiple times of pressing, the pressing direction of the electrode is perpendicular to the melting direction of the electrode in the vacuum consumable melting process, various raw materials on the cross section of the electrode are uniformly distributed during melting, and the raw materials in a molten pool are uniformly distributed in the melting process; and the components of the cast ingot are uniform and stable.

The utility model relates to the technical field of alloy block smelting, and discloses a mother alloy block smelting furnace which comprises a base plate, the top of the base plate is fixedly connected with a supporting frame, the interior of the supporting frame is fixedly connected with a melting tank, the top of the melting tank is fixedly connected with a feeding frame, and the top of the melting tank is provided with a vacuum pump. A motor is fixedly connected to the top of the melting tank, a transmission roller is fixedly connected to the output end of the motor, a first fixing rod is fixedly connected to the outer wall of the transmission roller, a second fixing rod is fixedly connected to the outer wall of the transmission roller, and a stirring assembly is arranged on the outer wall of the second fixing rod; the stirring assembly comprises a stirring rod and a scraping claw. According to the stirring device, the output end of the motor drives the transmission roller to rotate, so that the effect of stirring the middle part and the bottom of the melting tank is achieved, the problem of non-uniform components of materials in the melting tank caused by difficulty in fully stirring the middle part and the bottom is solved, and the component uniformity of a master alloy block is improved.

The preparation method comprises the following steps: weighing raw materials for preparing the sputtering target material according to a preset stoichiometric ratio, mixing zinc oxide powder and manganese oxide powder in ethanol, carrying out wet grinding for 2-4 hours, adding Cu powder, W powder and Ta powder, continuously carrying out wet grinding for 1-20 hours, drying, and screening to obtain mixed nano powder; filling the mixed nano powder into a graphite mold, putting the graphite mold into a hot pressing furnace, carrying out hot pressing sintering in a vacuum environment at 900-1100 DEG C, cooling, demolding, taking the material, and machining to obtain a sputtering target material in a target shape; the special requirement of the blue light storage recording layer is focused, the optical performance is optimized through a ZnO doping system, the raw materials adopt a segmented grinding process, and the problems that raw material powder is agglomerated and metal powder is prone to sinking in the mixing process are solved; the obtained target material has the advantages of excellent resistivity (less than 50 * 10 <-4 > omega.cm) and high density (gt, 95%), the coating film transmittance of the prepared target material is more than 85%, and the requirement for a high-performance blue light storage recording layer is met.

A method for preparing gradient cemented carbide based on differentiated ball milling and using pre-alloyed cobalt-nickel as the binder phase includes the following steps: (1) preparation of pre-alloyed cobalt-nickel binder powder; (2) preparation of surface mixed powder; (3) preparation of core mixed powder; (4) spark plasma sintering. This invention pre-alloys Co powder and Ni powder, which is beneficial for improving the compositional uniformity and distribution uniformity of the CoNi binder phase, and for ensuring stable distribution of the binder phase during sintering; differentiated ball milling of the surface layer and core layer establishes the interlayer structure basis of the gradient cemented carbide from the powder source; the gradient structure gives the surface layer higher hardness and wear resistance, and the core layer better toughness and crack resistance, achieving a unified matching of high surface hardness and high core toughness; densification is achieved by pre-pressing combined with spark plasma sintering, resulting in a gradient cemented carbide with clear layered structure characteristics and excellent comprehensive service performance.

The utility model relates to the technical field of transformers, and discloses a fluorescent paint brushing detection device for monitoring leakage oil sites of a radiator, which comprises a shell, and the bottom of the shell is open; the batching container is provided with a plurality of cavities, the plurality of cavities are communicated with a pressure pumping mechanism through a pipeline, and a first one-way valve is arranged in the pipeline; the material mixing shell is arranged at the top of an inner cavity of the shell, an inner cavity of the material mixing shell is communicated with the batching container through a pumping and pressing mechanism, and a material mixing mechanism is arranged in the material mixing shell; the brushing shell is arranged at the bottom of the material mixing shell, the material mixing shell communicates with an inner cavity of the brushing shell through a pipeline, a second one-way valve is arranged in the pipeline, a percolation mechanism is arranged at the top of the inner cavity of the brushing shell, and a brushing mechanism is arranged at the bottom of the inner cavity of the brushing shell; the detection shell is fixedly connected to the outer wall of the shell, and an ultraviolet lamp is arranged on one side of an inner cavity of the detection shell. According to the utility model, the oil leakage point of the radiating fin can be detected in real time under the condition of no shutdown, and the maintenance construction efficiency of the transformer is ensured.

The invention provides an aluminum-tungsten-titanium intermediate alloy and a preparation method and application thereof, and the preparation method comprises the following steps: mixing an aluminum simple substance, titanium dioxide, a tungsten source, a flux and a heat generating agent, igniting in a graphite molten pool by using an ignition agent to carry out an aluminothermic reaction, and cooling after the aluminothermic reaction is finished to obtain the aluminum-tungsten-titanium intermediate alloy, the graphite molten pool is a hollow reaction cavity formed by a graphite material. According to the preparation method, the segregation phenomenon caused by the metal melting point difference of the aluminum-tungsten-titanium intermediate alloy is avoided, the difference value of the W content is controlled to be within 0.74 wt%, the difference value of the Ti content is controlled to be 0.77 wt%, the component uniformity of the alloy is remarkably improved, the preparation method can be used for preparing the high-tungsten-content intermediate alloy with the tungsten content being 60 wt% or above, the method is simple and convenient, and the cost is low. The production efficiency is high.

The invention discloses a preparation method of a high-quality Ti60 titanium alloy bar and a product, a titanium alloy cast ingot with low impurities (Fe is less than or equal to 0.008% and O is less than or equal to 0.075%) and high component uniformity can be produced, the diameter of the produced cast ingot finished product is phi 580mm-phi 780mm, meanwhile, the cast ingot can be used for producing a large-specification bar with phi 300-500mm, and the preparation method is suitable for industrial production. The method comprises the following steps: (1) selecting raw materials; (2) electrode pressing; (3) electrode welding; (4) carrying out vacuum consumable smelting for the first time; (5) secondary vacuum consumable smelting; (6) carrying out third vacuum consumable smelting; (7) single-phase region fire-insulation reversing upsetting and drawing; (8) performing fire-insulation reversing upsetting and drawing on the two-phase region; and (9) two-phase region drawing-out forging.

This invention discloses an automatically target-changing pulsed laser deposition apparatus and method. The apparatus includes a process chamber, a transfer valve, and a buffer chamber. The process chamber is connected to the buffer chamber via the transfer valve and is configured as an internal vacuum chamber. The buffer chamber has a door at its upper part and operates as a vacuum chamber. A sample stage is located on the upper inner side of the process chamber. Two neck tubes are located on the two sides of the process chamber for guiding an external laser source and mounting a laser detection device, respectively. The process chamber also includes a rotatable target stage for loading and unloading targets from the buffer chamber. The buffer chamber includes a rotating target stage mechanism and a vision camera for placing the target material and recording the bottom features of the target material, respectively. This invention provides an automatically target-changing pulsed laser deposition apparatus and method with a compact structure, precise positioning, and automatic target changing capabilities, enabling fully automated deposition of ultrapure thin films.

The application provides an aluminum-molybdenum-iron intermediate alloy, wherein the mass percentage of each element in the aluminum-molybdenum-iron intermediate alloy is as follows: molybdenum: 55.0-60.0%, iron: 30.0-35.0%, oxygen: 0.01-0.1%, nitrogen: 0.001-0.05%, silicon: 0.01-0.2%, carbon: 0.01-0.05%, and the balance is aluminum. The application also provides a preparation method of the aluminum-molybdenum-iron intermediate alloy. The application also provides a method for preparing a titanium alloy ingot by using the aluminum-molybdenum-iron intermediate alloy. The application uses the aluminum-molybdenum-iron intermediate alloy as a raw material for vacuum self-consumption smelting, so that the content of iron and molybdenum in a high-iron and high-molybdenum titanium alloy ingot with a diameter of Ф550mm- Ф750mm is less than or equal to 0.2wt% in different regions, and the composition uniformity is effectively improved.

The invention discloses a device and a method for preparing a quasicrystal film through magnetron sputtering. The device comprises a closed sputtering cavity, a magnetron sputtering mechanism, a quasicrystal film forming mechanism, a working gas circuit and an annealing heating mechanism, the magnetron sputtering mechanism and the quasicrystal film forming mechanism are respectively mounted on the bottom wall and the top wall in the closed sputtering cavity; the fluid outlet end of the working gas path is in fluid communication with the gas inlet of the closed sputtering cavity, and the gas outlet of the closed sputtering cavity is in fluid communication with the fluid inlet end of the working gas path. The method comprises the following steps: forming a sputtering atmosphere in a closed sputtering cavity by using a working gas path, and depositing an amorphous precursor film on the surface of a quasi-crystal substrate of a quasi-crystal film forming mechanism through a magnetron sputtering mechanism; and forming a vacuum inert atmosphere in the closed sputtering cavity by using a working gas path, and carrying out vacuum annealing treatment on the amorphous precursor film by using an annealing heating mechanism to generate the quasi-crystal film. The problems that an existing quasi-crystal film is low in component control precision, insufficient in quasi-crystal phase content and the like can be solved.

The invention provides a superfine dispersion aluminum-molybdenum intermediate alloy for an aluminum alloy and a preparation method of the superfine dispersion aluminum-molybdenum intermediate alloy. The aluminum-molybdenum intermediate alloy provided by the invention comprises the following components in percentage by mass: 4.5-5.5% of Mo, less than or equal to 0.10% of Si, less than or equal to 0.20% of Fe and the balance of Al, the second phase particle size of the microscopic structure is less than 50 microns, and is reduced by more than 60% compared with that of a product prepared by a conventional doping method; according to the test of an AA TP-2 method, the sufficient dissolving time of the aluminum-molybdenum intermediate alloy is within 10 minutes, and the dissolving speed of the aluminum-molybdenum intermediate alloy is increased by more than 50% compared with that of a conventional doping method. The superfine dispersion aluminum-molybdenum intermediate alloy provided by the invention is prepared by adopting a gradient component control method; compared with a traditional molybdenum and aluminum opposite doping method, the obtained aluminum-molybdenum intermediate alloy is remarkably improved in structure and high in dissolution rate; and the quality defects of composition segregation, coarse structure and the like caused by insufficient dissolution of the second phase after the molybdenum element is added are avoided.

This invention discloses a method for preparing Ti60 high-temperature titanium alloy ingots, relating to the field of titanium alloy technology. Based on the target composition range of the Ti60 high-temperature titanium alloy ingot, the proportions of each alloying element in the ingot are determined as follows: Al: 5.8-7.2%, Sn: 3.2-4.3%; Zr: 2.7-3.8%; Mo: 0.3-0.9%; Si: 0.3-0.5%; Nb: 0.3-0.6%; Ta: 0.8-1.4%; C: 0.05-0.07%. By determining a reasonable proportion range for each alloying element, the various elements of the Ti60 titanium alloy achieve synchronous melting and uniform distribution within a limited melting time, suppressing elemental segregation and improving the compositional uniformity of the Ti60 titanium alloy. Furthermore, by first utilizing the high energy density and excellent refining capabilities of the electron beam cold hearth furnace, and then further adjusting the composition and structure through a vacuum consumable arc furnace, the compositional uniformity and purity of Ti60 high-temperature titanium alloy ingots are effectively improved, expanding the application of titanium alloy materials in petrochemical, aerospace, nuclear power generation, hydrogen storage, and military industries.

The invention provides a perovskite thin film double-sided annealing method and device, and relates to the technical field of perovskite solar cell preparation, in the perovskite thin film double-sided annealing method provided by the invention, a temperature cooperative control strategy taking accurate control of a real-time temperature difference between an upper heating plate and a lower heating plate as a core constraint condition is adopted, and the perovskite thin film double-sided annealing effect is achieved. On the basis of double-sided heating, the longitudinal temperature gradient of the perovskite thin film in the annealing process is actively and accurately regulated and controlled, and the problems of disordered crystal orientation, poor thin film quality and the like caused by unbalanced heating of a heat source are effectively avoided, so that the crystal quality, the component uniformity and the interface stability of the perovskite thin film are remarkably improved, and the service life of the perovskite thin film is prolonged. And a process guarantee is provided for preparing a high-performance and high-reliability perovskite photoelectric device.

The application provides a method and device for double-kidney-shaped light spot laser narrow-gap welding, and the method comprises the following steps: (1) performing base layer welding in the welding space of a workpiece to be welded, and performing weld cleaning to obtain a first welding piece; the weld of the workpiece to be welded comprises a weld surface and a groove surface on the weld surface; (2) performing double-kidney-shaped light spot laser welding in the welding space of the first welding piece, wherein the light spot of the double-kidney-shaped light spot laser welding simultaneously acts on the side wall of the groove surface and the corner of the weld surface of the workpiece to be welded, the welding wire is swung in the process, the first pass of the filling layer is completed, and then the weld is cleaned; and (3) repeating step (2) until the welding is completed. The application has excellent welding effect for low-temperature steel with a narrow gap, and can be applied to the welding of nuclear fusion steel.

The present application relates to the metallurgical technology field, especially relate to a kind of off-oven refining combined vacuum arc remelting preparation ultra-pure stainless steel method.The preparation method of the present application is by AOD station to transfer the crude molten steel obtained by EAF smelting to AOD refining furnace to blow oxygen refining, pre-reduction refining slag is CaO-CaF2-SiO2-MgO slag system;After pre-reduction treatment, reduction treatment is carried out, and the reduction refining slag is CaO-CaF2-SiO2-MgO slag system;The molten steel after reduction treatment is transferred to VD furnace for vacuum treatment, and the treated molten steel is transferred to ladle, then poured into mold, and ingot is obtained;After ingot is forged into electrode, ultra-pure stainless steel is prepared by VAR, with ultra-high cleanliness, coarse system inclusions is 0 level, fine system A+B+C+D inclusions≤0.5 level, effectively realize the accurate low control of aluminum content in steel, and simultaneously reduce the oxygen content and non-metallic inclusion content in steel, finally prepare high-quality ultra-pure stainless steel.

The invention relates to the technical field of crystal growth, in particular to a crystal growth method adopting a high-pressure inert atmosphere edge-defined film-fed crystal growth method, which comprises the following steps of: melting a crystal raw material and a doping agent under 6-10MPa inert gas, growing a crystal by a Czochralski method, and adopting staged dynamic pressure regulation during growth, the method comprises the following steps: sequentially carrying out neck (6-8 MPa), shouldering (linearly reducing to 4-6 MPa), equal-diameter (constant 4-6 MPa) and ending (reducing to 3-4 MPa) stages, adopting a double-layer structure, adopting a high-density solid body as the inner layer, enabling the aperture to be 102-108% of the target diameter, and arranging a spiral micro-channel on the side wall; the outer layer is a porous material, the porosity is 15-25%, annealing is carried out after growth, and pressure relief is carried out in stages: when the pressure is greater than 1 MPa, the pressure is released at 0.2-0.3 MPa / min, and when the pressure is less than 1 MPa, the pressure is slowly reduced to normal pressure at 0.05-0.15 MPa / min, so that the wastage rate of volatile components can be controlled below 0.5%.

The invention belongs to the technical field of additive manufacturing, and relates to an isometric crystal high-homogeneity titanium-niobium alloy and an electric arc double-wire additive manufacturing method thereof. The method comprises the following steps: mounting and fixing a pretreated pure titanium wire, a pure niobium wire and a substrate, inputting specific process parameters into a control system of electric arc double-wire additive manufacturing equipment, and carrying out electric arc double-wire deposition in a specific scanning mode to obtain the isometric crystal high-homogeneity titanium-niobium alloy. According to the method, the problem of high niobium inclusion is solved, the uniformity of titanium-niobium alloy components can be promoted, rapid preparation of the isometric crystal high-homogeneity titanium-niobium alloy can be conveniently achieved, subsequent plastic deformation of the isometric crystal high-homogeneity titanium-niobium alloy is facilitated, stable production of isometric crystal high-homogeneity titanium-niobium alloy products can be met, and the method is suitable for industrial production. And the stability of the performance of the part in service is ensured.

The invention relates to the technical field of metal material preparation, and discloses a niobium-titanium alloy multi-time smelting plate forming process method based on an EB furnace, which comprises the following steps: step 1, completing raw material charging in a smelting cavity according to a preset proportion; 2, the raw materials are subjected to primary fusion in a preset vacuum environment, and the raw materials are preliminarily fused and flatly laid in a smelting cavity; 3, the melting power is increased, and the melt is homogenized through secondary melting; 4, the melting power is reduced, the three-time melting environment is kept till a plate-shaped object is formed, and leveling treatment is conducted on the surface of the plate-shaped object; fifthly, the plate-shaped object in the fourth step is turned over, and the melting environment is continuously kept for three times till a finished plate is formed; according to the method, the component uniformity is improved, surface pits and internal cracks are reduced, the product yield is improved, and the energy consumption is reduced.