211 results about "Argon flow" patented technology

The invention provides a method for growing an oversized diamond polycrystalline film. The method comprises the following steps: S1, cleaning and drying a monocrystalline silicon wafer at room temperature; s2, carrying out pretreatment seed crystal on the monocrystalline silicon wafer, covering a diamond nanocrystalline layer on the silicon surface, and putting the monocrystalline silicon wafer into MPCVD (Microwave Plasma Chemical Vapor Deposition) equipment; s3, the cavity is vacuumized, then hydrogen is introduced for purging, and then vacuumizing is conducted again; then hydrogen is introduced, the air pressure is regulated and controlled to be 5-8 torr, and starting is started to ignite the plasma; s4, the microwave power is increased to 70 KW to 75 KW at the speed of 4.5 KW / min to 5.5 KW / min, the air pressure is increased to 165 torr to 180 torr at the speed of 10 torr / min to 30 torr / min, and the temperature is increased to 900 DEG C to 950 DEG C at the speed of 60 DEG C / min; s5, introducing growth gas, wherein the flow rate of hydrogen is 5000-6000 sccm, the flow rate of methane is 100-150 sccm, the flow rate of oxygen is 5-8 sccm, the flow rate of nitrogen is 1-2 sccm, and the flow rate of argon is 800-1000 sccm; and S6, after the growth is finished, cooling at a rate of 30 DEG C / min, and introducing nitrogen into the cavity for vacuum breaking until the temperature is reduced to room temperature, so as to obtain the oversized diamond polycrystalline film. The size of the oversized diamond polycrystalline film reaches 12 inches.

A high scrap steel ratio steelmaking nitrogen control integration technology is characterized by comprising the steps that pig iron and coke are added into a converter and molten iron, and the bottom blowing strength of the converter is improved; converter sealing and argon protection optimization are carried out, and then silicon iron heating and waste steel treatment are carried out before blowing; the first blowing hit rate is optimized, tapping and deoxidation are controlled, and the nitrogen content of the optimized alloy is detected; transferring into a refining furnace, and adjusting the power transmission heating time and the deoxidation and alloying time; optimizing a low-slag-quantity and low-temperature-period power transmission mode, and controlling the argon flow of the refining furnace; and optimizing slagging at the early stage of refining, controlling a silicon-manganese composite deoxidation and slag system, and controlling argon flow during soft blowing of the refining furnace. According to the technology, the nitrogen removal amount of the converter under the low molten iron unit consumption condition is improved mainly through carbon content supplementation, waste steel size optimization and exothermic agent heat supplementation, and the nitrogen increase of the refining furnace is reduced. According to the integrated nitrogen control process technology, the nitrogen content can be effectively reduced, the investment and application of vacuum degassing equipment are reduced, the process is simplified, and the production cost is reduced.

The invention is applicable to the technical field of carbon nanotube materials, and provides a cobalt-selenium co-doped carbon nanotube and a preparation method and application thereof, and the preparation method comprises the following steps: adding cobalt nitrate hexahydrate and a carbon nanotube into a methanol solution to obtain a solution A; dissolving 2-methylimidazole in a methanol solution to obtain a solution B; mixing the solution A and the solution B to form a purple precipitate, separating and washing the purple precipitate, and performing vacuum drying to obtain a ZIF-67 (at) CNT precursor; and putting the ZIF-67 (at) CNT precursor and selenium powder into a tubular furnace, raising the furnace temperature and preserving heat under argon flow, and then cooling to room temperature to obtain the Co-CoSe (at) CNT. According to the invention, a diatomic cobalt (Co) and selenium (Se) co-doped carbon nanotube (CNT) material is adopted as a main body material of sulfur, through a synergistic effect, the chemical adsorption capacity of the electrode material is remarkably enhanced, polysulfide is effectively captured, and excellent physical barrier performance is provided, so that the shuttle effect is further inhibited, and the long cycle life of the lithium-sulfur battery is prolonged.

The invention provides an argon flow and micro-positive pressure linkage control method for an electroslag furnace. The method comprises the steps that the oxygen content and micro-positive pressure signals in the furnace are collected; the future furnace condition is predicted through the deep belief network model; optimizing initial parameters of the fuzzy PID controller in an off-line manner by using a particle swarm algorithm; on the basis of the real-time signal and the prediction result, adaptively adjusting controller parameters on line; and finally, an argon flow and dust removal valve opening control instruction is output in a linkage mode. According to the method, future furnace conditions are predicted through the deep belief network model, the control advancement is realized, and the problem of large lag of the system is solved; offline parameter optimization is carried out on the fuzzy PID controller through a particle swarm algorithm, and excellent initial performance adapting to different working conditions is provided for the fuzzy PID controller; the parameters of the controller are adaptively adjusted through online fuzzy reasoning, so that the system has robustness for coping with a dynamic process; finally, accurate and stable linkage control of the oxygen content in the furnace and the micro-positive pressure is achieved through linkage calculation of the argon flow and a dust removal valve opening instruction.

The invention provides an image processing method for identifying a soft blowing argon pattern area of a steel ladle, which relates to the field of image processing, and comprises the following steps: collecting an argon pattern image of a slag surface of the steel ladle; preprocessing: carrying out edge detection on the image; an optimal edge oval shape is fitted; determining an action area of an argon port; carrying out dynamic region segmentation on the exposed molten iron and the steel slag; identifying effective argon flower areas of the two branches; and the argon flow of the two branches is adjusted. According to the method, the argon flow of each branch is accurately regulated and controlled according to the identified argon pattern size of each branch, so that the identified argon pattern size of each branch reaches the set size, the stability and consistency of the soft blowing process can be remarkably improved, the production requirements are better met, and the production effect is improved.

The invention relates to a continuous casting process optimization method for inhibiting slag entrapment of casting powder, which adopts a CFD (computational fluid dynamics) calculation mode to obtain the slag entrapment rate of the casting powder in a crystallizer and the rate of capturing slag drops by a wall surface, can intuitively reflect the slag entrapment condition in the crystallizer, and realizes accurate control of the slag entrapment rate and the slag drop capturing rate. Furthermore, numerical simulation of continuous casting crystallizer slag entrapment is carried out on the basis of computational fluid mechanics (hereinafter referred to as CFD) under the conditions of certain section width and thickness of the crystallizer, certain inner diameter and insertion depth of the submersed nozzle and certain argon flow, and different dip angles of the submersed nozzle are adopted under the conditions of different pulling speeds; therefore, slag entrapment of the crystallizer casting powder is inhibited, and the occurrence rate of the slag entrapment defect of the automobile outer plate casting powder is reduced. Compared with the prior art, the method has the advantages that the slag entrapment rate and the slag drop capturing rate can be accurately controlled, and the steel-making defect occurrence rate of the surface of the automobile outer plate can be greatly reduced.

The invention relates to the technical field of steelmaking dust removal fan frequency adjustment, in particular to a steelmaking dust removal fan frequency conversion adjustment method which comprises the steps that target steel grade information and information of the current smelting stage of molten steel are obtained; and obtaining the initial carbon content and the initial nitrogen content of the molten steel. And setting the target carbon content and the target nitrogen content of the molten steel according to the smelting stage information. And according to the initial carbon content and the target carbon content of the molten steel, the oxygen flow required by smelting is obtained. And obtaining the nitrogen flow required by smelting according to the initial nitrogen content and the target nitrogen content of the molten steel. And the argon flow required by smelting is obtained according to the oxygen flow. And according to the oxygen flow, the nitrogen flow and the argon flow, the flue gas flow in the smelting period is obtained. And controlling the frequency of the dust removal fan based on the flue gas flow. The power consumption of the dust removal fan can be reduced, the production cost is reduced, the influence on the environment and the health of workers is reduced, and the problem that the overall efficiency is low due to local optimum of the dust removal fan can be solved.

The invention discloses a mechanical argon arc welding machine for welding a boiler, and belongs to the field of argon arc welding machines, the mechanical argon arc welding machine comprises a welding main body and a positioning clamp, the positioning clamp is provided with a clamping and positioning system, the clamping and positioning system is provided with a rotating system, the rotating system is fixedly provided with a fixing cylinder, and a welding assembly is arranged in the fixing cylinder; an air conveying assembly is arranged in the fixing cylinder, an adjusting assembly is arranged in the fixing cylinder, an air suction assembly is arranged on the fixing cylinder, and the air conveying assembly comprises a first annular sliding groove and a second annular sliding groove which are formed in the fixing cylinder. Through cooperation of the transmission component and the air inducing component, the supporting disc is driven to eject stable vortex-shaped argon flow, the arc protection stability and uniformity are effectively improved, meanwhile, the arc protection range can be effectively expanded, and meanwhile it can be further ensured that the argon flow of the device is large or small through the adjusting assembly and the transmission component. And stable vortex-shaped argon flow can be sprayed out.

The invention provides a crystal pulling method for improving the BMD defect density in monocrystalline silicon and a monocrystalline silicon rod, and belongs to the technical field of monocrystalline silicon crystal pulling, and particularly relates to the following steps: stabilizing the oxygen content in a crystal in a relatively high interval by cooperatively regulating and controlling the argon flow, the furnace pressure, the crucible rotating speed, the crystal rod rotating speed and the pulling speed, providing a sufficient oxygen source for generation of BMD defects, and improving the BMD defect density in the monocrystalline silicon on the basis of stabilizing the oxygen content in the crystal in a relatively high interval. In the equal-diameter process, temperature compensation is carried out on a crystal bar through a preset temperature compensation device, diffusion and precipitation of oxygen atoms are effectively promoted to form BMD crystal nucleuses, the BMD body defect density and the axial distribution uniformity are remarkably improved, the specification lower limit of the BMD density is promoted to be improved to 1.0 E + 11 ea / cm < 3 > or above, the internal gettering capacity of a silicon wafer is finally enhanced, and the service life of the silicon wafer is prolonged. And a reliable guarantee is provided for improving the performance and yield of the device.

The invention provides a method for improving continuous casting castability of rare earth structural steel, which is mainly characterized in that La-Ce rare earth alloy is added into a steel ladle for La-Ce rare earth treatment after deoxidation and desulfurization treatment of molten steel is completed, the La-Ce rare earth content is 20-30ppm, the argon flow in the bottom argon blowing process is 200-300L / min, the soft blowing time is not less than 8min, and the argon pressure is 0.3-0.4 MPa. Through deoxidation process optimization, alloy element content control, refining outbound temperature control, calcium treatment process optimization, continuous casting protection pouring process optimization and the like, the purpose of improving the transverse impact performance of the plate is achieved on the premise that the continuous casting castability is not affected, and the key process for improving the continuous casting castability of the rare earth structural steel is formed. Compared with the prior art, the excellent transverse impact performance of the plate is obtained, and the castability of continuous casting is not affected.

The invention discloses a totally-closed argon protection device, which relates to the technical field of die casting pouring, and comprises a steel ladle nozzle, a funnel brick, a central casting pipe, an upper argon ring, a lower argon ring and a cover body arranged between the upper argon ring and the lower argon ring, an upper argon gas outlet and an upper argon gas inlet are formed in the upper argon gas ring, the upper argon gas outlet is formed in the inner side of the upper argon gas ring, and an opening of the upper argon gas outlet faces the inclined upper portion; and the lower argon ring is provided with a lower argon outlet and a lower argon inlet. The upper argon outlet blows upwards obliquely, upper argon flow drives air around the upper argon ring to flow outwards at the moment, so that air in the cover body is exhausted, meanwhile, when the lower argon outlet blows towards the middle injection pipe, argon is in contact with the middle injection pipe and then escapes, and part of argon escapes towards the inside of the cover body. Meanwhile, along with continuous outward flow of air around the upper argon gas ring, the whole cover body is continuously filled with escaping argon gas blown out by the lower argon gas ring, so that the oxygen content in the cover body is reduced.

The invention relates to a production method of nitrogen-containing low-carbon aluminum killed molten steel. The method comprises the following steps: 1) smelting by adopting a top-bottom combined blown converter; (2) the converter smelting process is controlled; (3) controlling the smelting end point of the converter; (4) controlling molten steel sedation; (5) controlling tapping of the converter; and (6) refining of a molten steel argon blowing station is controlled, the molten steel fed with the aluminum wire is subjected to weak stirring, the argon flow is controlled to be 50-100 L / min, the molten steel is subjected to weak stirring for 6-8 min, finished molten steel is obtained, and the finished molten steel comprises, by weight, 0.02%-0.045% of C, smaller than or equal to 0.034% of Si, 0.2%-0.3% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.012% of S, 0.025%-0.06% of Al, 0.0035%-0.0065% of N, smaller than or equal to 0.0035% of T [O] and the balance Fe and residual elements. According to the method, the problem of accurate nitrogen increasing in converter smelting of the low-carbon aluminum killed molten steel is solved, the cleanliness of the molten steel is improved, the argon blowing direct feeding process of the nitrogen-containing low-carbon aluminum killed molten steel is achieved, and the smelting cost is reduced.

The present application provides a full-process intelligent refining system applied to an LF refining furnace, which relates to the field of iron and steel metallurgy and includes: a slag-making control module that calculates the addition amount of slag-making agent; a temperature prediction module that predicts and controls the molten steel temperature in real time; a blowing argon control module that establishes a relationship model between the exposed area of molten steel and the bottom blowing argon gas flow rate; a wire feeding prediction module that calculates the feeding amounts of aluminum wire and calcium wire; an alloy calculation module that automatically controls the alloy addition amount; a machine-assisted module that collects data and performs sampling and slag sticking work; a main control module that is used to control the system operation; and a server for data storage and interaction. The present application uses technologies such as statistical methods and mechanism calculations to establish mechanism models for each refining process, predict and automatically control the refining process, effectively improving the hit rate of alloy components and the temperature compliance rate, and at the same time reducing alloy consumption and power consumption.

The invention relates to an efficient desulfurization smelting method of an LF (ladle furnace) refining process, which comprises the following steps of: 1, preparing casting residues, normally pouring LF deeply desulfurized steel, closing a sliding plate after a roughing slag detection system gives an alarm, transferring a steel ladle with the casting residues to a corresponding station, and waiting for tapping, 2, adjusting the components of the casting residues, transporting the steel ladle with the casting residues to a tapping station before converter tapping, (3) adding a deoxidizing agent, namely adding a certain amount of aluminum alloy according to oxygen at the end point of molten steel of the converter before tapping of the converter so as to quickly remove oxygen elements in the molten steel, (4) controlling stirring, controlling the flow of low argon blowing of a steel ladle to be 400-500Nm < 3 > / h in the tapping process of the converter, and stirring the molten steel with argon to be mixed with top slag of the steel ladle, and (5) carrying out residual desulfurization on the molten steel, and 6, top slag of the steel ladle is adjusted, the steel ladle is conveyed to an LF refining process work station, lime and a top slag deoxidizing agent are added, and the top slag of the steel ladle is further treated so as to further remove the sulfur element in the steel.

The invention discloses a method for preparing a Bi2Te3 thermoelectric material EBSD sample through ion grinding. The specific method comprises the following steps: cutting a Bi2Te3 material by adopting a linear cutting technology to obtain a sample with a proper size, inlaying, grinding and polishing, and ultrasonically cleaning to remove surface impurities; the method comprises the following steps: horizontally placing a sample on an objective table, closing a cabin door, opening a mechanical pump to vacuumize to 0.01 pa, and rotating the angle of the sample table until the included angle between the ion beam jet direction and the normal direction of the surface of the sample is 85-88 degrees; the argon flow is set to be 1.5 mL / min; turning on a main circuit switch, adjusting the acceleration voltage to 2kv, setting the grinding time to be 15-20 minutes, starting an ion gun switch, opening a plate valve after the current is stabilized at 350-400uA, starting grinding, and rotating the sample table. And after grinding is finished, resetting the acceleration voltage to be 4kv, grinding again, taking out the sample, and carrying out EBSD observation.

The invention provides a metal oxide film preparation method capable of realizing a stable stoichiometric ratio, and belongs to the technical field of nano-scale film preparation. According to the method, a metal oxide radio frequency magnetron sputtering target material is used as a raw material, the metal oxide thin film is prepared on a pretreated growth substrate in a radio frequency magnetron sputtering mode, and in the radio frequency magnetron sputtering process, the rotating speed of the growth substrate is 5-300 r / min, the shielding gas is argon, the flow is 10-80 sccm, and the power of radio frequency magnetron sputtering is 20-120 W. According to the invention, the prepared metal oxide film has a stable stoichiometric ratio and high flatness and uniformity by regulating and controlling core parameters such as gas flow, internal pressure of the cavity and radio frequency magnetron sputtering power.

The invention provides a chip welding method and system and a storage device, and the method comprises the steps: obtaining a welding pressure data set, dividing the welding pressure data into a plurality of discrete pressure data segments through the discrete characteristics of the welding pressure data set, determining a pressure deviation coefficient of a target chip, obtaining a pre-welding image of the target chip, and obtaining a pre-welding image of the target chip; the method comprises the following steps: pre-welding a target chip pin, extracting a to-be-welded spot distribution vector of the target chip pin from a pre-welding image, and determining a welding gun offset during welding of the target chip through a pressure deviation coefficient and the to-be-welded spot distribution vector, thereby determining an argon flow domain of each to-be-welded spot of the target chip pin, and further determining a flow compensation value of each pin of the target chip. Therefore, according to all the flow compensation values and the welding gun offset, the variable welding flux amounts of the target chip pins at different positions are determined, all the pins of the target chip are heated and welded through all the variable welding flux amounts, and dynamic adjustment of the welding flux amounts in the chip welding process can be achieved.

The invention provides a full-process intelligent refining system applied to an LF refining furnace, and relates to the field of ferrous metallurgy. The full-process intelligent refining system comprises the steps that a slagging control module calculates the adding amount of a slagging constituent; the temperature prediction module predicts and controls the temperature of the molten steel in real time; the argon blowing control module establishes a relation model between the molten steel exposed area and the bottom blowing argon flow; the wire feeding prediction module calculates the feeding quantity of the aluminum wire and the calcium wire; the alloy calculation module automatically controls the alloy adding amount; the machine auxiliary module is used for collecting data and sampling and sticking slag; the main control module is used for controlling system operation; and server data storage and interaction. According to the method, a statistical method, mechanism calculation and other technologies are used, the mechanism model of each refining process is established, the refining process is predicted and automatically controlled, the alloy component hit rate and the temperature standard-reaching rate are effectively increased, and meanwhile alloy consumption and power consumption are reduced.

The application discloses a low-ash-consumption converter smelting method, adopts single-slag smelting, controls the converter scrap steel ratio in 8% to 26%, controls the top blowing oxygen supply flow in 3.0 to 4.0 Nm 3 / (min·t), controls the bottom blowing argon flow in 0.03 to 0.10 Nm 3 / (min·t); the smelting process is improved by the cooperation of the gun position and the charging; the solid waste slag is added in the converter blowing process, the content of CaO in the slag is controlled in 45% to 55%, and the content of MgO is controlled in 5.5% to 7.5%; meanwhile, the dust removal pressure ball is added to improve the activity of FeO in the slag, and the terminal carbon content of the converter is controlled to be less than or equal to 0.05%. By adding the solid waste slag in the smelting process, the slag needed to oxidize a large amount of iron elements to generate FeO is reduced, so that the total iron content of the slag is reduced; by adding the synthetic slag, the liquidity of the slag is ensured, and the carbon-oxygen reaction is promoted; the total iron content of the low-carbon steel converter terminal slag is stably controlled to be less than 14.5%, the metal yield is provided; the lime addition amount can be reduced, the lime addition amount is controlled to be less than or equal to 10 kg / t, and the cost is reduced.

The invention discloses a method for prolonging the fatigue life of spring steel through rare earth treatment. The method specifically comprises the steps that the total adding amount of rare earth elements accounts for 0.02%-0.15% of the mass of molten steel; rare earth elements are added in the later stage of LF refining, after alloying is completed, small-gas-amount clean argon blowing is conducted for 10 min to 20 min, and the argon flow is 15 NL / min to 20 NL / min; after hot rolling, cooling to below 550 DEG C at the cooling speed of 10-20 DEG C / s; and heating the hot-rolled spring steel blank to 450-550 DEG C, keeping the temperature for 2-3 hours, and then performing air cooling. According to the method, molten steel is purified through rare earth elements, long-strip-shaped MnS and other inclusions are converted into spherical rare earth oxysulfide (such as Ce2OS), stress concentration sources are reduced, and the crack initiation probability is reduced. Austenite grain growth is inhibited through rare earth elements, so that the spring steel obtains a uniform and fine structure (the grain size is greater than or equal to 9 grades), and the crack propagation resistance of the material is enhanced. Through the synergistic effect of tempering treatment and rare earth treatment, the comprehensive mechanical property of the spring steel is improved, and the fatigue life is greatly prolonged.

The present invention discloses a control method, device, electronic device and storage medium for bottom blowing argon in a converter ladle, wherein the control method comprises: obtaining the nitrogen content of molten steel in a converter; determining the type of molten steel in a converter according to the nitrogen content; obtaining the weight of molten steel in the converter ladle when the converter is tapping steel; determining the set flow rate of bottom blowing argon in the converter ladle according to the type and the weight of the molten steel, and performing closed-loop control based on the set flow rate of bottom blowing argon. The control method solves the problems of uncertain start timing and argon blowing amount in manual experience-based control of bottom blowing argon in a converter ladle, and is conducive to saving argon flow.

The invention relates to the technical field of molten steel refining. The invention discloses an LF furnace dynamic argon blowing method, device and equipment and a medium. The method comprises the steps that the molten steel temperature, the oxygen activity, the average diameter of inclusions and the number of the inclusions are obtained; based on a preset argon flow estimation model, estimating the total argon flow in the current period according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions and the number of the inclusions; and on the basis of a preset argon gas distribution rule, according to the total argon gas flow of the current period, the argon gas flow of each subarea in the current period is obtained, and the argon gas flow of each subarea is adjusted. The total argon flow is calculated according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions and the number of the inclusions in multiple dimensions, the accuracy of the argon flow is improved, then the argon flow of each partition is dynamically adjusted in different periods according to the argon distribution rule, and the stirring uniformity is improved.

The invention discloses a continuous casting steel capillary hole ventilation rod head which comprises 12%-18% of white corundum, 34%-40% of fused alumina zirconia, 12%-14% of active a-Al 2O3 micro powder, 12%-14% of fused magnesite, 2%-4% of silicon carbide, 18%-22% of graphite, 1%-3% of olivine, 2%-4% of mica powder, 0.5%-1.5% of magnesium sulfate powder and 1.5%-2.5% of calcium sulfate. And the additional resin binder accounts for 14-16% of the total mass of the mixture. According to the continuous casting steel capillary hole ventilation rod head and the preparation method thereof, the argon flow is accurately controlled, the molten steel flow speed is accurately controlled, the molten steel quality is stable, the fluctuation condition of the liquid level of a crystallizer is improved, inclusion blockage is reduced, and the number of steel casting furnaces is increased.

A continuous casting long nozzle argon sealing structure, argon blowing control system and control process belong to the technical field of steelmaking, the continuous casting long nozzle argon sealing structure, including long nozzle body and the bowl part outer periphery of its covering shell, the shell is provided with argon inlet, the bowl part outer periphery is provided with annular groove, the volume of the annular groove gradually increases from the argon inlet to its opposite side, the beneficial effects of the present application are that the argon sealing structure designed in the application is simple, the manufacturing cost is low, the argon is uniformly and effectively distributed in the long nozzle circumferential direction, the argon blowing control system and process involved automatically adjust the argon flow of corresponding gear according to the net weight of molten steel in the ladle, the argon blowing effect of molten steel casting process is monitored in real time, the failure rate is reduced, and the quality of molten steel is effectively improved.

The invention relates to the field of semiconductor materials, in particular to a crystal pulling thermal field control method, a crystal pulling thermal field system and application. The crystal pulling thermal field control method comprises the following steps: in an equal-diameter growth stage of czochralski silicon, when the curing rate of a silicon rod is less than or equal to 30%, controlling the argon flow to be 90-120SLPM, and controlling the furnace pressure to be 800-1000Pa. According to the crystal pulling thermal field control method, in the initial stage of equal-diameter growth where the oxygen segregation effect is most sensitive, argon flow and furnace pressure are cooperatively controlled in a specific'low flow-low pressure 'window, and a process environment beneficial to oxygen volatilization instead of entering crystals is actively created. The segregation and doping of oxygen atoms to a solid-liquid interface are effectively inhibited from the aspect of dynamics, and the method is the most critical step for realizing the overall low oxygen content of the silicon rod, especially reducing the oxygen content of the head and improving the axial uniformity.

The present invention discloses a smelting method for improving the bottom blowing air permeability of a newly launched ladle, comprising the following steps: Step 1, heating the bottom of the moving ladle; Step 2, before tapping, blowing argon at the bottom of the moving ladle; during tapping, blowing argon at the bottom of the moving ladle throughout the process. When tapping from the converter, the temperature is ≥1635°C, and only 0.4 - 0.5 Kg / t of metallic aluminum is added during tapping. The metallic aluminum is used as a deoxidizer and a heating agent; Step 3, after tapping is completed, adjust the argon flow rate to 300 - 500 L / min and perform strong argon blowing for 2 - 3 min. Stir through strong argon blowing to avoid cold steel condensation at the bottom of the ladle. After stirring, perform soft argon blowing for 30 - 60 s, then close the argon and connect the moving ladle to the moving small steam drum; Transfer the moving ladle to LF. During the transfer of the moving ladle to LF, maintain bottom blowing argon of the moving ladle through the moving small steam drum; Step 4, after the moving ladle enters LF, connect the ladle argon gas source, perform strong stirring to avoid cold steel condensation at the bottom of the ladle, and then perform normal refining; The present invention has the advantages of high molten steel refining air permeability, reducing the amount of cold steel formation, and preventing blockage of the porous plug.

The present application relates to a kind of multi-scene adaptive intelligent bottom argon blowing control method and system, comprising: the ladle reaches working position after determining gas permeability, receives the signal of sitting ladle, starts blowing argon, infrared thermal imager is opened to monitor picture and determine molten steel surface, fills complete all ladle liquid level area;Intelligent link all refining equipment PLC, according to different stages of metallurgical purpose, determine the bottom blowing stirring power, calculate the bottom blowing gas pressure, bottom blowing gas flow, the naked area of molten steel in continuous video stream, naked edge slag layer height and other related parameters are tracked and calculated in real time, further optimize bottom blowing control;Flow data instruction is issued to bottom blowing PLC, control the pressure and flow size of bottom blowing gas.The present application automatically receives argon blowing state molten steel video image continuously according to the need of on-site production, uses intelligent bottom blowing control to automatically distribute argon flow and pressure, ensure that each furnace reaches better bottom blowing stirring effect, give on-site production guidance, reduce production labor intensity.

The invention provides a tundish argon control system which comprises a control device, a first pipeline control valve, a mass flow meter and a second pipeline control valve, and a purging branch is formed by connecting the mass flow meter and the second pipeline control valve in series. The control device switches a control mode according to a tundish car position signal: a main pipeline control valve is opened when a tundish car starting signal is received, a main pipeline is closed and a purging branch is started after a casting position is reached, and the argon flow is accurately controlled by adjusting the opening degree of a branch control valve. The argon supply opportunity is advanced to inhibit molten steel oxidation, and the argon flow control precision is improved.

The invention discloses a high-performance N-type skutterudite thermoelectric material barrier layer with a composite structure and a preparation method thereof, and belongs to the technical field of thermoelectric conversion. The preparation method comprises the following steps that a Mo target is installed at a radio frequency target position, a W target is installed at a direct current target position, a skutterudite wafer substrate is fixed to a substrate, and the substrate is heated and vacuumized; and the argon flow is set and introduced, bias voltage is started, radio frequency and direct current power supplies are synchronously started to pre-sputter the target material, then radio frequency sputtering of the Mo connecting layer and direct current sputtering of the W barrier layer are sequentially carried out, and the W-Mo composite barrier layer is prepared. The method is used for solving the technical problems that due to the limitation of the high melting point of refractory metal W, a compact tungsten barrier layer is difficult to prepare through a common sintering process, the diffusion capacity of barrier elements is reduced, mismatch of thermal expansion coefficients of the metal W and a skutterudite matrix is large, and the barrier layer is prone to failure in a thermal cycle service environment.

The invention discloses a preparation method and application of a titanium-silver doped antibacterial bone electroactive material, and relates to the field of bone electroactive materials. The preparation method of the PVDF bone electroactive film comprises the following steps: cutting, cleaning and blow-drying the PVDF film, and preserving in vacuum; and depositing a titanium elementary substance and a silver elementary substance serving as magnetron sputtering target materials on the PVDF film to obtain the titanium-silver doped antibacterial bone electroactive material, the magnetron sputtering method comprises the steps that under the argon atmosphere condition, the internal air pressure of a magnetron sputtering cavity is adjusted to range from 0.5 Pa to 5 Pa, the sputtering distance ranges from 4 cm to 10 cm, the sputtering power is maintained to range from 50 W to 100 W, the substrate temperature ranges from room temperature to 300 DEG C, the argon flow speed ranges from 5 sccm to 80 sccm, and the duration time ranges from 10 min to 20 min. According to the preparation method disclosed by the invention, the surface of the PVDF bone electroactive film is effectively modified by using titanium and silver through a magnetron sputtering technology, so that the adhesion of the PVDF film and bone tissues is remarkably improved, and the PVDF film has excellent antibacterial activity and good induced osteogenesis activity.