10830 results about "Inert gas" patented technology

The invention relates to the technical field of lithium iron phosphate production, and discloses a carbon-coated titanium-doped lithium iron phosphate positive electrode material and a preparation method thereof.The preparation method comprises the following steps that 1, a ferrous solution and a phosphorus source solution are mixed in proportion, dopamine hydrochloride is added, a pH regulator is dropwise added in the stirring state, the pH of the solution is adjusted to 4.0-5.5, a reaction is conducted, a titanium source solution is added, and a reaction solution is obtained; after uniformly stirring, continuously dropwise adding a pH regulator to regulate the pH value of the solution to 5.5-6.5; the iron phosphate octahydrate coated with the titanium-embedded polydopamine is obtained; 2) calcining the titanium-embedded polydopamine-coated ferrous phosphate octahydrate in an inert gas atmosphere to obtain carbon-coated titanium-doped anhydrous ferrous phosphate; 3) mixing the carbon-coated titanium-doped anhydrous ferrous phosphate with lithium phosphate and a carbon source, ball-milling, mixing, spray-drying and calcining to obtain a carbon-coated titanium-doped lithium iron phosphate positive electrode material; the synthesis process is simple, and energy consumption is reduced.

The invention discloses a box-type energy storage substation operation control method and system, a product and a medium. The method comprises the following steps: collecting gas concentration data in the box-type energy storage substation, comparing the gas concentration data with a preset threshold value, and judging whether gas leakage exists or not; if yes, recording related data, and detecting an insulation resistance value of the electrical contact component; based on the gas concentration data and the leakage time of the leakage area, judging whether a chemical reaction triggering condition is met or not; if yes, inert gas is sprayed to the leakage area; if the insulation resistance value is lower than a safety threshold value, electromagnetic isolation is carried out on the leakage area, and distribution of the electric load to the related energy storage unit is stopped; then, current is applied to the electrical contact component at a preset frequency, and an insulating property value is detected; when the insulating property is restored to within the safe range, the electrical load is redistributed to the leakage region. By implementing the technical scheme, the safety of the fault area after the insulation performance is reduced due to gas leakage in the operation process of the box-type energy storage substation is improved.

The invention discloses dust removal equipment for dust explosion prevention and a dust removal method thereof, and relates to the field of dust removal equipment.The dust removal equipment comprises a dust removal box, a plurality of dust removal cloth bags in the dust removal box and a treatment mechanism for dust explosion prevention, the treatment mechanism is composed of a gas mixing assembly, a scraping assembly and a vibration assembly, and a filter bag top frame is connected with a vibration pipe frame through the vibration assembly; the gas mixing assembly is communicated with the dust removal box through a gas inlet pipe, the gas mixing assembly is used for mixing dusty gas and inert gas and preliminarily removing large-particle dust, and the scraping assembly is arranged below the gas mixing assembly and scrapes the filtered large-particle dust; and the vibration assembly is used for periodically vibrating the dust removal cloth bag after the scraping assembly is detached so as to remove fine dust attached to the inner wall of the dust removal cloth bag. Inert gas is introduced and fully mixed before entering the dust removal box, and primary large-particle dust is filtered, so that the oxygen concentration is reduced, and dust explosion is effectively prevented.

The invention discloses a vacuum cup laser welding device, and belongs to the technical field of laser welding, the vacuum cup laser welding device comprises a processing table, the top of the processing table is connected with a base box, and the top of the base box is provided with a synchronous clamping assembly. According to the device, the air curtain assembly is arranged, a continuous and uniform annular laminar flow air curtain is formed by means of the nozzle array evenly distributed in the circumferential direction, a stable inert gas protection environment is formed in a welding area, the oxidation probability of a molten pool is remarkably reduced, meanwhile, the air curtain structure optimally designed through fluid dynamics can effectively disperse welding smoke dust, and the welding quality is improved. By means of a mechanical structure, the angle of the direction adjusting pipe can be accurately adjusted, the coverage range of the air curtain can be flexibly adjusted, accordingly, the vacuum cup body with different specifications can be adapted, possible protection blind areas are eliminated, and the service life of the vacuum cup body is prolonged. And the optimal action angle between the welding protection airflow and the workpiece surface is always kept.

Systems, assemblies, and methods to enhance extraction of pyrophoric materials from a refinery apparatus may include supplying a pressurized fluid to a plurality of vacuum generators, and generating, via the plurality of vacuum generators using the pressurized fluid, a vacuum flow. A manifold may provide a flow path for the vacuum flow, and pyrophoric material may be extracted from the refinery apparatus via the vacuum flow to a material collector through which the vacuum flow passes, depositing at least a portion of the extracted pyrophoric material in the material collector. One or more of inert gas or a cooling medium may be supplied to the material collector.

The invention discloses an intelligent safety monitoring method and system for coal mine excavation, and belongs to the technical field of coal mine safety, and the method specifically comprises the steps: deploying a plurality of adaptive sensing nodes in an excavation area, each node comprising an environment state collection unit and an equipment vibration collection unit, and collecting environment data and mechanical vibration waveforms respectively; then, according to the position of the mining machine and the tunnel structure change, node physical connection is adjusted to form a dynamic topology network, and when mechanical movement exceeds a threshold value, adjacent nodes are subjected to high-density monitoring; then, synchronously generating a coupling data stream according to the collected data timestamps, inputting the coupling data stream into a pre-constructed model, and predicting the overlap ratio of mechanical vibration abnormity and a target gas accumulation area space; when the overlap ratio exceeds a critical value, an emergency response is triggered, the speed is reduced firstly, inert gas is released, and power is cut off if set duration is continued; and finally, reversely correcting surrounding rock stress parameters in the model according to emergency data. According to the invention, the accuracy and response timeliness of early warning of coal mine disasters are improved.

The invention discloses a preparation method and a production system of phosphorus trifluoride, and belongs to the technical field of preparation of phosphorus trifluoride. Phosphorus trichloride and first mixed gas are continuously introduced into a reactor, the first mixed gas comprises anhydrous hydrogen fluoride and inert gas, phosphorus trichloride and anhydrous hydrogen fluoride in the first mixed gas are subjected to a double decomposition reaction in the reactor, and intermediate gas containing phosphorus trifluoride is generated. Collecting intermediate gas discharged from the reactor, and rectifying and purifying the intermediate gas to obtain a phosphorus trifluoride product. The inert gas carries anhydrous hydrogen fluoride and phosphorus trichloride to generate double decomposition reaction to generate phosphorus trifluoride, and the inert gas can dilute the concentration of the raw material gas anhydrous hydrogen fluoride participating in the reaction and also can take away heat generated by the reaction, so that the temperature of the reactor is more stable, and continuous production of phosphorus trifluoride is realized.

The invention provides a low-concentration chemical-physical coupling intelligent continuous porous carbon production method and system. The method comprises the following steps: pretreatment: crushing a carbon source to obtain a carbon precursor; carbonizing: heating and carbonizing the carbon precursor in a fluidized bed reactor to obtain a carbonized product; chemical activation: dipping the carbonized product in a chemical activator solution to obtain a chemical activated product, and drying the chemical activated product; physical activation: mixing a reaction gas and an inert gas as an activation gas, placing the chemical activation product in the activation gas, and performing gas activation at a preset temperature to obtain a physical activation product; and post-processing. By coupling chemical activation with physical activation, the concentration of a chemical activation reagent can be reduced, and the wastewater amount and the pollutant concentration after reaction are reduced by reducing the dosage of the reagent, so that the wastewater treatment process is simplified, the treatment agent and energy consumption is reduced, and the treatment cost is reduced.

The invention relates to the technical field of organic synthesis, and discloses a preparation method of bromo-pyrrole nitrile. The method comprises the following steps: (1) mixing p-chlorophenylglycine, acetonitrile, trifluoroacetic acid and a catalyst, then dropwise adding acyl chloride and carrying out acylation reaction, and after the reaction is completed, purging with an inert gas; (2) under the inert gas, mixing the mixture obtained in the step (1) with inorganic salt, then dropwise adding 2-chloroacrylonitrile, carrying out cyclization reaction, and separating a liquid phase from the obtained mixture; and (3) under the inert gas, mixing the liquid phase obtained in the step (2), hydrobromic acid and hydrogen peroxide, carrying out a bromination reaction, then extracting with acetonitrile to obtain an acetonitrile layer, then removing the acetonitrile, and then carrying out cooling crystallization to obtain the bromo-pyrrolenitrile. According to the technical scheme, the reaction yield is high, different solvents do not need to be frequently replaced, and the solvents can be recycled.

The invention discloses a chitosan modified lithium iron phosphate and carbon composite positive electrode material and a preparation method thereof.The preparation method comprises the steps that 1, lithium hydroxide, phosphoric acid and ferrous sulfate heptahydrate are mixed to prepare a uniform and stable solution, and a lithium iron phosphate precursor is prepared through a solvothermal method; step 2, dissolving chitosan in an acetic acid aqueous solution, and magnetically stirring under a water bath condition until the chitosan is completely dissolved to prepare a chitosan solution; and 3, adding the lithium iron phosphate precursor into a chitosan solution, uniformly mixing, carrying out ball milling and freeze drying, and carrying out high-temperature carbonization treatment in an inert gas to obtain the chitosan modified lithium iron phosphate and carbon composite positive electrode material. The method is simple to operate, low in cost and uniform in product particle size distribution.

The invention relates to the technical field of organic chemical synthesis, in particular to a preparation method of 3, 4 '-diaminodiphenyl ether.The preparation method comprises the steps that S1, under inert gas and in a first solvent, m-dinitrobenzene and p-acetamidophenol are subjected to a heating reaction under the condition of a weak base catalyst, and 3-nitro-4-acetamido diphenyl ether is prepared; s2, in a second solvent, the 3-nitro-4-acetamido diphenyl ether is subjected to a hydrogenation reduction reaction, and 3-amino-4-acetamido diphenyl ether is prepared; and S3, dissolving the 3-amino-4-acetaminodiphenyl ether in an alcohol solvent system, adding an aqueous solution of alkali, controlling the reaction temperature, carrying out a hydrolysis reaction, and after the reaction is finished, carrying out post-treatment to obtain the 3, 4 '-diaminodiphenyl ether. The preparation method provided by the invention has the advantages of easily available raw materials, low price, good selectivity and high product yield, and is more suitable for industrial production by comprehensively considering economical efficiency and safety.

The invention provides a method and system for detecting the content of platinum, palladium and rhodium in an automobile exhaust purification catalyst and application, and relates to the technical field of automobile exhaust purification, the method comprises the following steps: crushing, grinding, sieving, performing microwave acidolysis, neutralizing, washing and drying a catalyst sample to obtain dry filter residues; a trapping agent and a fluxing agent are added into the dry filter residues, constant-temperature heating is conducted in inert gas, then cooling forming is conducted, and an alloy button is obtained; blowing ash on the alloy, then adding mixed acid into the alloy, heating the alloy in a water bath at 95 DEG C for 25-35 minutes to obtain a dissolved solution, then adding a masking agent into the dissolved solution, and oscillating to obtain a solution to be detected; and filtering the liquid to be detected, fixing the volume and detecting. According to the method, precise quantification of trace platinum, palladium and rhodium in the complex matrix catalyst can be realized, and the method has a relatively high recovery rate; meanwhile, pollution elements are prevented from being used, and the method is green and efficient and better conforms to the concept of green chemistry.

According to examples, an optical lens assembly for head-mount display (HMD) devices may include an optical lens configuration with a first optical element and a second optical element. The first optical element and the second optical element may be affixed together along a peripheral edge to form a gap between the two optical elements and may compensate chromatic dispersion characteristics. The optical lens configuration may also include a reflective polarizer layer, a quarter wave layer, and a semi-transparent mirror provided on selected surfaces of the optical elements. In some examples, the gap may be filled with air or an inert gas.

The invention relates to the technical field of safety and environmental protection, in particular to a negative-pressure circulating explosion-control dust removal method suitable for combustible dust places, which comprises the following steps: firstly, sealing a bin body and injecting carbon dioxide-nitrogen inert gas to generate a low-oxygen environment; then, a flow guide angle-adjustable cyclone separator, a dielectric barrier discharge plasma reactor and a waste heat thermo-acoustic transducer are driven to cooperatively capture dust, and sound node amplitude synthesis capture data are obtained through compressed sensing of a microphone; inputting the environment data and the capture data into a reinforcement learning process containing a micro-thermochemistry model, and outputting instructions for adjusting negative pressure pulse, inert flow, sound field intensity and cyclone geometry; in combination with distributed radio frequency imaging data, an adversarial digital twinborn model is generated to predict explosion free energy, and automatic rollback or shutdown is carried out when the explosion free energy exceeds a threshold, so that a safe, efficient and low-energy-consumption closed loop is formed.

The invention discloses a high-temperature and high-pressure multifunctional integrated shock tube test system, belongs to the technical field of explosion and impact dynamics tests, and aims at solving the problem that an existing shock tube is usually single in function and is only used for a simulation test of a certain function. The high-pressure section and the low-pressure section of the shock tube are both made of high-temperature-resistant nickel-based alloy, an induction heater is adopted for heating, high-pressure inert gas is filled into the high-pressure section through pressure gradients of diaphragm sets with different layers of diaphragm clamping sections, high temperature and high pressure of the high-pressure section at the temperature of 20-900 DEG C and the pressure of 0.1-50 MPa are obtained, and the high-pressure shock tube has the advantages that the high-pressure shock tube is compact in structure and low in cost. The multifunctional integrated shock tube test system can be used for researching the crushing characteristics of rock materials under the conditions of different pressures, temperatures, water contents and the like, the damage characteristics of explosion shock waves in the air to a target piece and the impact damage characteristics of a high-speed projectile body. Effective methods and means are provided for related research, and the shock tube test technology and engineering application capability are expanded. The test system is easy to implement, low in cost and multipurpose.

The invention relates to a method and a system for detecting the sealing performance of a spherical underwater connector. The method comprises the following steps: injecting dry inert gas with the same working pressure into a sealing ring through a pressure measuring hole; 5-15-degree and 0.1-1Hz sinusoidal deflection motion is applied to the sphere, and the dynamic working condition that the underwater pipeline is impacted by ocean current for a long time is simulated through short-term limit periodic deflection motion; meanwhile, the pressure fluctuation amplitude delta P is recorded with the sampling frequency larger than or equal to 10 Hz, the first period delta P0 serves as the benchmark, delta Pn is measured regularly, and a delta P (t) curve is built; and determining a critical threshold value delta Pmax through an experiment, and calculating the duration of increasing the delta P0 to the delta Pmax according to the delta P (t) curve as the predicted service life. Through short-term limit dynamic loading and high-frequency monitoring, real-time state detection and long-term performance evaluation of the sealing ring are achieved, and the problem that sealing performance degradation under alternating stress cannot be predicted through traditional static detection is solved.

The invention relates to the technical field of fuel cells, and provides a preparation method of a fuel cell carbon-supported platinum catalyst, the catalyst and application, the preparation method comprises the following steps: S1, adding a platinum precursor solution and a carbon material into a solvent, dispersing, drying and grinding to obtain catalyst powder A; s2, performing primary microwave treatment on the catalyst powder A under inert gas to obtain catalyst powder B; and S3, mixing and grinding the catalyst powder B and the platinum precursor solid, and carrying out secondary microwave treatment under inert gas to obtain the carbon-supported platinum catalyst. The preparation method has the advantages that through two-step microwave treatment, the particle size of the platinum particles inside and outside the pores of the carbon carrier is accurately controlled under the condition that the high activity of the platinum particles is kept, so that the carbon-supported platinum catalyst has the advantages of high performance, high stability and durability, and meanwhile, the performance of the catalyst is not influenced under the low-humidity working condition.

The invention discloses automatic welding equipment for metal machining, and relates to the technical field of metal welding, the automatic welding equipment comprises a base, a fixed plate is fixedly mounted on the outer wall of the top of the base, a movable plate is slidably connected to the outer wall of the top of the base, and a welding assembly is arranged at the middle end of the top of the base; a second electric telescopic rod is controlled to be started, a welding gun head can be pushed to penetrate through a protection hopper cover, and butt-jointed metal pipes are welded; by means of the arranged protection hopper cover, welding slag generated by welding can be limited, the welding slag is prevented from falling off in a large range, and on the other hand, the cleaning assembly can conveniently clean the welding slag; meanwhile, the protection gas tank is arranged, inert gas can be injected into the protection hopper cover in the welding process, and therefore the situation of welding oxidation is reduced, and the welding effect is guaranteed; and meanwhile, after welding is completed, when the welding gun head is drawn back, the welding gun head can pass through the through opening, the surface of the welding gun head is scraped through the through opening, and therefore automatic cleaning of the surface of the welding gun head is achieved.

The invention discloses an electric energy metering box with an intelligent monitoring system, and relates to the technical field of electronic metering, in particular to the electric energy metering box with the intelligent monitoring system, which comprises a metering box shell and a box cover hinged to the front surface of the metering box shell, the bottom end of the metering electricity meter is provided with a plurality of power-on metering lines, and a cavity stabilizing plate capable of moving up and down is arranged at the position, close to the lower portion of the metering electricity meter, in the metering box shell. And through cooperation of the first extrusion plate, the third spring and the locking block of the metering ammeter, internal and external dual clamping forces can be formed during wiring, an extrusion stabilizing cylinder fixes an electrified metering line through symmetrical force application, hands of an operator are liberated, and wire harness deviation during wiring is avoided.

The invention relates to a negative pressure dust collection type cutting machine, and belongs to the technical field of cutting machines, the negative pressure dust collection type cutting machine comprises a cutting machine workbench, a cutting module, a negative pressure dust collection module, an explosion-proof filtering system and a control system, the cutting module comprises a three-dimensional five-axis cutting mechanism and a high-power laser cutting head, and the high-power laser cutting head is loaded at the driving end of the three-dimensional five-axis cutting mechanism. The dust collector has an anti-explosion effect and an environment-friendly discharge function, and is provided with an anti-static pipeline, an inert gas injection device and a spark catcher aiming at flammable metal dust, so that the explosion risk can be remarkably reduced, multi-stage filtration is carried out by adopting the sintered metal filter cartridge, the HEPA filter screen and the like, discharged air meets the environment-friendly standard, the sewage problem of traditional wet dust collection is avoided, and the dust collector is suitable for popularization and application. And the metal plate is fixed through the evenly-distributed adsorption holes, plate deviation caused by vibration or scrap accumulation in the cutting process is prevented, and the precision of the cutting path is improved.

The invention relates to the technical field of gas sampling, in particular to a gas in-situ sampling device suitable for a medium-high temperature geothermal field, the core of the gas in-situ sampling device is a sealed cabin, and the sealed cabin is internally integrated with a pressure stabilizing and separating unit which comprises a gas-liquid separating chamber with a lower inlet and an upper outlet so as to realize gas-liquid separation by utilizing gravity settling; at least one forevacuum sampling bottle for containing samples and at least one purging bottle pre-filled with high-pressure inert gas are arranged on the disc type magazine; the rotary positioning module is used for rotating the disc type magazine so as to align the bottle opening of the sampling bottle or the purging bottle to the outlet of the pressure stabilizing and separating unit; and the linear butt joint module is used for pushing the selected sampling bottle or purging bottle, so that the bottle opening of the selected sampling bottle or purging bottle is in butt joint with the outlet of the pressure stabilizing and separating unit. According to the embodiment of the invention, through cooperative operation of the rotary positioning module and the linear docking module in the sealed cabin, automatic operation of single-time well descending and multiple sampling is realized.

A laser additive manufacturing system and method for a magnesium-based composite material. The system comprises a laser adjuster (1), a laser (2), a forming cover (3), an oxygen content adjuster (4), an inert gas cylinder (5), a powder feeder (6), a substrate (7) and a wire feeder (8), wherein the laser adjuster is used for controlling laser processing parameters of the laser; the laser is connected to a laser processing head (10) by means of an optical fiber (9); the oxygen content adjuster is in communication with the forming cover, so as to control the oxygen content of a processing environment in the forming cover; the inert gas cylinder and the powder feeder both pass through the forming cover to be connected to the laser processing head; the substrate is located inside the forming cover; the wire feeder is connected to a wire feeding head (12) by means of a wire feeding tube (11); the wire feeding head passes through the forming cover to perform laser additive manufacturing for a magnesium-based composite material, together with the laser processing head; and a real-time cooling sleeve (13) is also mounted on the wire feeding tube. Also provided are a method for preparing a magnesium-based composite material using the laser additive manufacturing system for the magnesium-based composite material, and a prepared magnesium-based composite material. By means of the manufacturing system and method, the additive processing of wires and powder is realized, and a magnesium-based composite material with a good mechanical property is prepared.

The invention discloses a device and a method for testing wear resistance of a coating material in a high-temperature environment, and relates to the technical field of coating material testing, and the device comprises a workbench, a friction force loading mechanism, a test force loading mechanism, a high-temperature heating system, a force detection unit and a computer. The friction force loading mechanism provides stable friction force, the test force loading mechanism accurately applies test force, the high-temperature heating system creates a high-temperature environment, and the force detection unit detects force data in real time and transmits the force data to the computer for processing and analysis. The second driving mechanism is unique in structure and can accurately control test force loading, the circulating cooling unit is further arranged to protect the transmission shaft, the high-temperature furnace meets different temperature requirements, inert gas can be introduced to prevent high-temperature oxidation, and compared with a vacuum testing machine, the manufacturing cost can be greatly reduced. The problem that an existing detection device cannot accurately test the wear resistance of the coating material in a high-temperature environment is solved, and powerful support is provided for research, development and application of the coating material in the fields of aerospace and the like.

The invention discloses a rare earth boride nano material as well as a preparation method and application thereof. The phase state of the rare earth boride nano material is REB6 or REB4; the preparation method comprises the following steps: S1, respectively weighing a compound raw material containing an RE element and a compound raw material containing a B element; s2, adding an additive, and fully grinding; s3, reacting under the protection of inert gas; s4, after the reaction is finished, excessive methanol is added, centrifugal separation is performed after no bubbles emerge, and a precipitate A is reserved; s5, adding diluted hydrochloric acid for soaking, and performing centrifugal separation again to reserve a precipitate B; and S6, washing the precipitate B with deionized water, and drying to obtain the rare earth boride nano material. According to the preparation method disclosed by the invention, a normal-pressure and low-temperature preparation method is adopted, the pure-phase rare earth hexaboride nanocrystal can be obtained at normal pressure and the temperature as low as 300 DEG C, and no active metal elementary substance needs to be introduced in the preparation process.

The invention belongs to the technical field of liquid metal coating and infiltration in grinding machining, and particularly relates to a temperature-control ultrasonic composite liquid gallium auxiliary grinding device and method for a micro engine blade, and the device comprises a fluid conveying module, a temperature adjusting module, a machining module, an ultrasonic vibration module and an electromagnetic field generator. Temperature control of liquid gallium is achieved by arranging a microwave cavity and a cooling system, stable supply is guaranteed through inert gas and a liquid gallium conveying pipeline, and uniform coating and ultrasonic vibration infiltration on the surface of the blade of the micro engine are achieved by combining an ultrasonic transduction assembly and a spraying nozzle. The electromagnetic field generator further enhances the adhesion and lubrication effects of the liquid gallium on the grinding wheel and the blades. The defects of insufficient grinding temperature control and lubrication of a traditional grinding wheel are overcome, the grinding temperature rise and the friction coefficient are effectively reduced, thermal damage and surface deformation are avoided, and the machining precision and the surface quality of complex curved surfaces and tenon tooth parts are improved.

The invention discloses a welding device and method for a rocket engine jet pipe, and belongs to the technical field of aerospace engine welding. The welding device for the rocket engine jet pipe comprises a first tool used for clamping a to-be-welded scalloped segment of the engine jet pipe, a second tool used for clamping a to-be-welded barrel and a gas protection supporting cover used for conducting inert gas protection on the front face of a welding seam of the engine jet pipe. The first tool comprises a first inner supporting piece, the first inner supporting piece is sleeved with a pressing plate, and the pressing plate is provided with a first pressing structure for pressing the edge of the scalloped segment; the second tool comprises a second inner supporting piece and a third inner supporting piece which are used for supporting the barrels, and a pressing mechanism for pressing the splicing positions of the adjacent barrels is arranged outside the second inner supporting piece or the third inner supporting piece. By the adoption of the welding device and method for the rocket engine jet pipe, the problems that an existing engine jet pipe is prone to being oxidized when welded in the atmosphere, defects are generated, and the welding cost is high can be solved.

The invention provides a strengthening and toughening control method for a high-strength titanium alloy welded joint, and relates to the technical field of metal material welding, the strengthening and toughening control method comprises the following steps: S1, during welding, multi-layer and multi-channel gradient heat input is adopted, the heat input quantity of front-channel welding is Q1, the heat input quantity of rear-channel welding is Q2, and Q1 is greater than Q2; s2, after welding, cooling a welding area by stages, adopting inert gas forced convection cooling in a primary cooling stage, adopting water mist pulse cooling when the welding area is cooled to a medium temperature stage, and adopting natural air cooling when the welding area is cooled to a low temperature stage; through the synergistic effect of multi-layer multi-channel gradient heat input and staged cooling, the microstructure and performance of the high-strength titanium alloy welded joint can be effectively regulated and controlled, the structure gradient regulation and control of the titanium alloy welded joint are achieved, the tensile strength, the ductility, the fracture toughness and the creep property of the welded joint are improved, meanwhile, the process can be simplified, and deformation is reduced.

An apparatus and method for determining the presence of a disease by analyzing a specimen by providing a vial partially containing the specimen and partially containing a headspace above the specimen, injecting an inert gas into the specimen in the vial to cause bubbling of the gas throughout at least a portion of the specimen such that the gas mixes with volatile organic compounds (VOCs) present in the specimen to create a VOC / gas mixture that is released into the headspace, collecting the VOC / gas mixture from the headspace in the vial, supplying the VOC / gas mixture to a chamber within the apparatus, causing the VOC / gas mixture to pass over a sensor array in proximity to the chamber, the sensor array generating an electrical signal as a function of VOCs detected in the VOC / gas mixture, and processing the electrical signal to determine the presence of a disease in the specimen.

The invention belongs to the field of material testing, and discloses a method and a system for testing a hydrogen-induced cracking threshold value based on a notched round rod tensile sample, the testing method comprises the following steps: in a hydrogen environment and an inert gas environment, respectively carrying out a slow strain rate tensile test on the notched round rod tensile sample to obtain test data and two elongation rates; the hydrogen embrittlement sensitivity index of the material is obtained through the two elongation rates; acquiring elastic-plastic parameters by using the hydrogen embrittlement sensitivity index of the material and test data; when the elastic-plastic parameter is greater than 3.5, acquiring a hydrogen induced cracking threshold value by adopting an elastic-plastic crack propagation mechanism; and when the elastic-plastic parameter is not greater than 3.5, a hydrogen induced cracking threshold value is obtained by adopting a linear elastic crack propagation mechanism. The test method is short in period, high in efficiency and high in universality.

The present invention provides a method for preparing a carbon-containing lithium sulfide composite material, the method comprising: in a water-free and oxygen-free environment of a vacuum glove box, weighing a certain amount of lithium source and sulfur source, putting them into a ball mill, and then adding sodium borohydride according to a set ratio to mix evenly; sealing the ball mill, and passing an inert gas after evacuation, and then ball milling for a certain time at a set speed and after the ball milling is completed, taking out the lithium sulfide solid under the protection of the inert gas; dissolving and filtering the obtained lithium sulfide solid in anhydrous ethanol, and adding a certain amount of carbon source to the filtrate, stirring, and ultrasonic treatment; heating and evaporating to remove the solvent, and obtaining a solid Li2S / C precursor; placing the Li2S / C precursor in a vacuum freeze dryer, and freeze-drying to remove residual moisture to obtain a Li2S / C composite material. The present invention solves the problems of high cost and low purity when preparing lithium sulfide in the prior art.