146 results about "Plasma flame" patented technology

The invention discloses a plasma-enhanced direct-injection type liquid ammonia atomizing nozzle and a liquid ammonia combustor, and belongs to the field of liquid fuel combustion. The plasma-enhanced direct-injection type liquid ammonia atomizing nozzle comprises a liquid ammonia channel, a compressed air channel, an atomizing channel, a secondary air channel and a heating assembly, wherein the outlet end of the compressed air channel and the outlet end of the liquid ammonia channel are both communicated with the atomizing channel; the heating assembly comprises a high-voltage electrode, a ground electrode and a central air channel, the ground electrode is arranged on the outer side of the high-voltage electrode, and an outlet of the central air channel faces a discharge area formed by the high-voltage electrode and the ground electrode; a discharge area formed by the high-voltage electrode and the ground electrode is close to the liquid ammonia channel; a ground electrode hole is formed in the position, close to the liquid ammonia channel, of the ground electrode. Self-evaporation of preheated liquid ammonia is achieved through small plasma flames, efficient atomization of large-flow liquid ammonia is achieved, and consumption of atomization media is reduced while stable combustion is achieved.

The invention belongs to the technical field of aircraft coating processing, and particularly relates to an aircraft surface automatic spraying method based on a heavy-load robot, which comprises the following steps: carrying out geometric modeling on an aircraft body workpiece; a spray gun tool coordinate system is calibrated, and TCP coordinate optimization calculation is carried out by fusing spray gun 3D model parameters and flame long distance values; constructing a global workpiece coordinate system dynamic database; automatic coverage of a multi-layer U-shaped reciprocating spraying path is achieved through a path planning algorithm; after a fixed spraying distance parameter is set, the spraying software process package generates a robot track, and path simulation is carried out; a robot movement track program is generated by combining parameters of coating types, plasma flame lengths, spraying angles and spraying speeds; and a low-speed transition point is inserted into a track alarm point, and dynamic smooth connection of a spraying path is achieved. The spraying efficiency of the large machine body workpiece is improved, and manual intervention is reduced; and the adaptability is high, and spraying objects of different shapes and sizes can be rapidly dealt with.

The invention discloses a plasma spraying preparation method for a micro-nano double-layer PTFE coating on the surface of a flexible shaft steel wire, and particularly relates to the technical field of functional materials.The plasma spraying preparation method comprises the following steps that 1, a mandrel and a steel wire are installed on twisting equipment, and an inductive coupling plasma torch tube is installed on a driving guide rail parallel to the mandrel; 2, the pickling solution serves as a raw material, the pickling solution is atomized into micro-droplets through a feeding system and an air supply system, the micro-droplets are rapidly sprayed out of the torch pipe, and pickling spray is formed; 3, the twisting equipment is started, the steel wire is twisted around the mandrel, meanwhile, the driving guide rail is started, the twisted steel wire is subjected to acid pickling treatment through acid pickling spray sprayed out of the torch pipe, and the surface of the steel wire is roughened; 4, feeding of the pickling solution is stopped, high-flow gas is introduced into the torch pipe through the gas supply system to form high-speed gas flow, and the residual pickling solution on the surface of the flexible shaft is blow-dried; and 5, starting an inductively coupled plasma spraying system, injecting the PTFE emulsion serving as a raw material into plasma flame flow, driving a guide rail to move to enable the plasma flame flow to scan the steel wire on the surface of the flexible shaft, and depositing a PTFE coating on the surface of the steel wire. According to the method disclosed by the invention, the double-layered PTFE coating is deposited on the surface of the steel wire by using an inductive coupling plasma spraying process for the first time in the flexible shaft steel wire twisting process, so that one-step rapid preparation of the anti-corrosion coating is realized.

The present invention discloses a plasma-enhanced direct-injection liquid ammonia atomizing nozzle and a liquid ammonia burner, which belong to the field of liquid fuel combustion. The plasma-enhanced direct-injection liquid ammonia atomizing nozzle comprises a liquid ammonia channel, a compressed air channel, an atomizing channel, a secondary air channel and a heating component, wherein the outlet end of the compressed air channel and the outlet end of the liquid ammonia channel are both connected to the atomizing channel; the heating component comprises a high-voltage electrode, a ground electrode and a central air channel, the ground electrode is arranged on the outside of the high-voltage electrode, and the outlet of the central air channel faces the discharge area formed by the high-voltage electrode and the ground electrode; the discharge area formed by the high-voltage electrode and the ground electrode is close to the liquid ammonia channel; a ground electrode hole is arranged on the ground electrode near the liquid ammonia channel. The present invention realizes the self-evaporation of the preheated part of the liquid ammonia through a small plasma flame, realizes the efficient atomization and stable combustion of large-flow liquid ammonia, and reduces the consumption of the atomizing medium.

A vacuum induction melting (VIM) furnace and method of using. A VIM is configured for use with metal-containing carbon powders. In operation, the metal-containing carbon powders are formed into a pellet so as to minimize or eliminate ejection of material during introduction of the pellet into the VIM processor. The VIM processor may be substituted or used in combination with a vacuum arc melt processing apparatus, an electron beam melt furnace, an ion plating furnace, a plasma flame source, a smelter, a traditional metal-metal melt furnace, or any equivalent. Pelletizing can be accomplished through use of a press or through application of any pelletizing technique and / or use of any apparatus that is able to generate pellets that have sufficient mass to avoid ejection from a VIM processor.

The invention discloses a composite material plasma erosion ablation method based on solid rocket engine working condition calibration, and belongs to the field of resin material plasma ablation. The method comprises the following steps: selecting a sample material and structure according to a calibration part of the solid rocket engine; obtaining calibration parameters of a calibration part of the solid rocket engine as calibration indexes, wherein the calibration parameters comprise an ablation rate, a back temperature and microstructure characteristics of fibers observed by an electronic scanning microscope; setting an initial plasma ablation process, performing plasma flame ablation on the sample, and measuring calibration parameters of the sample as test indexes after cooling; and dividing the calibration index by the test index to compare the calibration ratios, and if the calibration ratios range from 0.45 to 0.55, completing the calibration. The result of the prepared sample in the plasma flame ablation state is kept consistent with the ablation of the actual solid rocket engine, and the ablation fitting of the actual working condition of the solid rocket engine can be realized.

The invention discloses a plasma ignition system and method and device, electronic equipment and a storage medium, and relates to the field of plasma ignition, and the main technical scheme comprises an ignition module, an electrical module, a gas supply module, a driving module, a cooling module and a control module; the ignition module is placed on the wall of a boiler, and the electrical module, the gas supply module, the driving module, the cooling module and the control module are connected with the ignition module. Fire coal powder is placed in the boiler; the driving module, the gas supply module, the cooling module and the control module are respectively connected with the electrical module; and the gas supply module and the cooling module are respectively connected with the control module. Compared with the prior art, the plasma ignition system is used for generating the plasma flame to ignite the fire coal powder in the boiler, fuel oil does not need to be used, and the ignition cost is reduced.

The present invention concerns a furnace for melting vitrifiable materials, comprising (i) a melting tank with heating means configured to melt vitrifiable materials; (ii) a fining tank with heating means configured to refine the melt; (iii) a neck separating the melting tank and the fining tank; (iv) inlet means located at the melting tank to charge the vitrifiable materials; (v) outlet means at the fining tank to flow the refined melt to a working zone; wherein the heating means in the fining tank comprises a plurality of thermal plasma torches configured to emit from a working fluid a plasma flame above the melt.

A method for testing the heat insulation performance of a thermal barrier coating comprises the following steps: preparing a set of plasma flame spraying equipment, preparing a metal sheet, and spraying the thermal barrier coating on the surface of the metal sheet to prepare a coating sample; preparing a high-temperature electric furnace and an aluminum oxide fiberboard with the same size as a furnace door brick, embedding the metal sheet into the aluminum oxide fiberboard, and exposing the coating surface and the back surface of the metal sheet; opening a furnace door of the high-temperature electric furnace, sealing the furnace door by using the cut aluminum oxide fiber plate as a furnace door brick, and embedding the metal sheet into the aluminum oxide fiber plate in the direction that the coating surface faces the interior of the furnace; setting a heating program of the electric furnace to heat the electric furnace to a temperature required to be tested; testing the temperature of the back surface, exposed in the air, of the metal sheet by using a laser thermometer; the steps are repeated for multiple times, the difference value between the furnace temperature and the back temperature is recorded, and the average value is calculated and can serve as the judgment basis of the heat insulation performance of the thermal barrier coating. The method is simple and convenient to operate, accurate in test condition and high in practical application value.

The embodiment of the utility model belongs to the technical field of plasma cleaning, and relates to a cover plate for plasma cleaning, which comprises a cover plate main body, one surface of the cover plate main body is provided with an ink layer, the ink layer is provided with an AF coating, and one surface of the ink layer far away from the cover plate main body is cleaned by plasma flame. According to the printing ink layer, flame plasma cleaning is adopted, the flame plasma cleaning is used for cleaning the printing ink layer, stains, dust and other impurities on the surface of printing ink can be effectively removed, in the cleaning process, organic matter and impurities on the surface of the printing ink layer can be decomposed and removed through the high-temperature oxidation effect of plasma flames, and therefore the printing ink layer can be cleaned. Meanwhile, the surface of the ink layer and the AF coating are not damaged, and use is facilitated.

The invention relates to the technical field of plasma spraying, in particular to metal powder plasma spraying equipment which is characterized in that a nozzle is mounted on a spray gun, a powder conveying pipe is mounted at the nozzle, a plurality of gas conveying pipelines are uniformly arranged on the side wall of the spray pipe around the axis of the spray pipe, and an annular pipeline is fixedly mounted on the outer side wall of the spray pipe; the annular pipeline is communicated with the gas conveying pipeline, the annular pipeline is connected with an argon supply system through a flow guide pipe, an annular groove is formed in the end face, located at the outlet, of the spray pipe, and the gas conveying pipeline is communicated with the annular groove. According to the invention, the metal powder is prevented from leaving the plasma flame due to turbulent flow of the mixed gas, so that the spraying phenomenon is avoided, and the utilization rate of the spraying material of the metal powder plasma spraying process is improved on the premise of ensuring that the production efficiency of the metal powder plasma spraying process is not changed. The invention further provides a metal powder plasma spraying process.

The invention provides an embedded multifunctional plasma flame stabilizer, and relates to the technical field of plasma ignition combustion supporting. The embedded multifunctional plasma flame stabilizer comprises an evaporative flame stabilizer and an embedded exciter, wherein the evaporative flame stabilizer is provided with a combustion area defined by apron boards; the embedded exciter is installed on the surface, facing the combustion area, of the apron board. The exciter is directly integrated on the inner side of the skirt board of the flame stabilizer, and the space utilization rate and the system integration degree are improved on the premise that the aerodynamic configuration and the installation mode are not changed. The discharge area of the exciter covers the backflow area, active free radicals can be generated and local heat can be released under complex and changeable conditions, the reaction activity of mixed gas is enhanced, the ignition delay time is shortened, the ignition boundary is expanded, meanwhile, atomization and mixing are improved, the combustion efficiency is improved, and flame quenching is restrained. The device has ignition assistance, continuous excitation and active thermochemical regulation and control capabilities, and is suitable for a compact combustion chamber environment.

The utility model discloses a kind of anti-collision plasma flame torch cutting torch, including cutting torch main body, collar group, swing disc and electrode group. Collar group is made of positioning ring and float ring, electrode group is arranged therebetween, float ring can cause electrode sheet separation when contact with external object, trigger alarm. Swing disc is movably sleeved in the outer periphery of cutting torch main body, multiple contact rods and isolation plates are arranged thereon;When longitudinal or oblique contact occurs, contact rod is contacted with barrier to cause swing, drives isolation plate to be inserted between electrode sheet, realizes disconnect detection. Isolation plate is connected with positioning ring by spring, with automatic reset function. The structure realizes 360 degrees omnidirectional lateral collision detection and longitudinal, oblique protection, with the advantages of fast response, simple structure, strong self-resetting capability, etc., suitable for collision sensing and safety control of cutting torch in plasma cutting operation.

A two-shaft movable thermal spraying heat preservation device comprises a heat preservation module, a two-shaft movable platform and a spraying gun advance and retreat hole, and the heat preservation module comprises a front cover, a flame spray gun installation frame, a plasma flame spray gun, a flame baffle ring, a spraying bin, a pipeline bin, a machine cabinet, a pipeline channel and a rear cover; the two-axis moving platform comprises an integrated rack, an X-axis moving track, an X-axis servo motor, a Y-axis servo motor, a Y-axis moving track and fixing ground feet, the heat preservation module is arranged on the two-axis moving platform, and the X-axis servo motor or the Y-axis servo motor drives the heat preservation module to move along the X-axis moving track or the Y-axis moving track. The spraying bin and the flame baffle ring are both in interlayer design, water circulation cooling is carried out in the spraying bin and the flame baffle ring, damage of high temperature to the pipeline wiring harness and the plasma flame spray gun is prevented, and pipelines of combustible gas and cooling circulation water needed in the working process pass through the interior of the cabinet through the pipeline channel and are connected to the pipeline bin to be arranged and installed. Space is saved, and installation and fixation are facilitated.

The application discloses a stable discharging circuit of an electric flame cooker and the electric flame cooker, and belongs to the technical field of electric flame cookers. The stable discharging circuit of the electric flame cooker comprises a single boosting transformer and multiple groups of discharging circuits; the multiple groups of discharging circuits comprise a first discharging circuit, a second discharging circuit and an Nth discharging circuit which are connected in parallel with each other. The single discharging circuit of the application cannot pull down and clamp the voltage of other discharging circuits when first breakdown occurs, all discharging devices (positive and negative electrodes) can be reliably broken down in turn, and the phenomenon of no current and no discharging in some branches is eliminated; under the stable state, the electrode voltages of all branches are consistent, the currents are balanced, and the sizes of plasma flames are uniform.

The present disclosure provides a microwave plasma torch generating device, comprising: an input waveguide for inputting microwaves; a gradient waveguide, comprising a first gradient waveguide section and a second gradient waveguide section, the first gradient waveguide section and the second gradient waveguide section are used to distribute the power of microwaves to obtain a first microwave and a second microwave, wherein the power of the first microwave is higher than the power of the second microwave; a coaxial resonant cavity, used to generate a high-intensity electric field according to the second microwave; a quartz glass tube is a reaction cavity of a microwave plasma flame, used to generate a microwave plasma flame according to gas molecules under the action of a high-intensity electric field, and a cylindrical resonant cavity is used to generate an electric field of a certain intensity according to the first microwave to maintain the plasma flame. The plasma torch generated by the microwave plasma torch generating device has a larger plasma volume, a longer gas processing distance, does not require a mechanical ignition device for triggering, and consumes less energy.

The present invention discloses a stove head structure and an electric flame stove, comprising: a metal top shell, a ceramic bottom plate, a plasma assembly and an air intake device; the plasma assembly is composed of an anode needle, a ceramic tube and a cathode nozzle; the outer wall of the ceramic head is provided with a plurality of ventilation slots along the circumferential direction; the folded side wall of the metal top shell is provided with an air inlet hole, and a non-return member is installed at the expanded end of the air inlet hole. The ceramic tube structure of the ceramic tube of the present invention with ventilation slots on the outer wall of the ceramic head not only reduces the cost of ceramic tube preparation, but also reduces the installation cost, while ensuring that the electrode needle will not be deformed and loosened due to thermal expansion, and realizes convection between the ventilation slot and the ejection port of the cathode nozzle, thereby improving the stability and efficiency of plasma flame injection; the present invention adopts a conical air inlet hole, a concave-convex surface design, and a non-return member made of silicone rubber material, which effectively realizes normal air intake and cuts off hot air backflow, and the cost of the non-return member is low.

The invention discloses a method for preparing SiC superfine and ultrapure powder by using a polycarbosilane synthesis byproduct, and relates to the field of materials. According to the preparation method, liquid polycarbosilane (LPCS) and a silicon-rich compound are jointly pyrolyzed into SiC superfine powder in a plasma flame heating mode, residual raw materials are decomposed again by utilizing waste heat of mixed gas, the by-product LPCS in polycarbosilane (PCS) production is fully utilized, and waste is turned into wealth; the particle size of the prepared SiC ultrafine powder is less than or equal to 500nm, and the particle size distribution is uniform; the Si / C ratio of the raw material is improved by adding the silicon-rich compound, and preparation of the ultra-pure SiC powder is achieved.

The utility model discloses a monitorable electric flame stove which comprises a stove shell, a stove head, a control module, a plasma driving circuit, a positioning module and a wireless communication module, the stove head is arranged at the top of the stove shell, and a plasma electrode is arranged on the stove head; the input end of the plasma driving circuit is connected with the control module, the output end of the plasma driving circuit is connected with the plasma electrode, and the plasma driving circuit is used for outputting high-voltage electricity under the control of the control module to enable the plasma electrode to generate plasma flames; the positioning module is connected with the control module and is used for acquiring position information of the electric flame stove; and the wireless communication module is connected with the control module and is used for transmitting the position information and the use data of the electric flame stove to a remote monitoring terminal. According to the electric flame stove capable of being monitored, the positioning module and the wireless communication module are arranged, so that a remote monitoring function is achieved, a user can obtain position information and use data of the electric flame stove in real time, particularly, safety guarantee is provided for remote monitoring of special groups such as old people, and potential safety hazards in use of the stove are reduced.

The utility model relates to the technical field of petrochemical engineering torch combustion, in particular to a plasma flame torch ignition device which comprises a plasma generator, a flamethrower and a control system, the plasma generator is electrically connected with the flamethrower through a cable, the plasma generator generates plasmas, and the control system is electrically connected with the flamethrower through a cable. According to the plasma torch, the plasma flames have proper temperature and speed by accurately controlling the working parameters of the plasma generator, so that the torch can be efficiently and rapidly ignited, the plasma flames can be rapidly ignited, and the plasma torch is high in practicability and high in practicability. The problems that the ignition efficiency is low, the energy consumption is high and the ignition reliability is poor due to the fact that an existing traditional torch ignition mode usually adopts electric spark or fuel gas indirect ignition are solved.

The invention discloses a method for preparing a double-layer Y2O3 etching-resistant coating through atmosphere and suspension plasma spraying, and particularly relates to the technical field of coating preparation. The method comprises the following steps: carrying out sand blasting, high-pressure water washing, blow-drying and drying pretreatment on an aluminum-based sample; spraying high-purity Y2O3 powder on the surface of the sample by adopting an atmospheric plasma spraying technology to form an APS bottom layer; grinding the surface of the APS bottom layer; putting the ground sample into an annealing furnace for annealing; after the sample is cooled, the Y2O3 suspension is injected into high-energy plasma flame flow through plasma spraying equipment, the Y2O3 suspension is melted and then impacts the surface of the APS bottom layer, the SPS top layer is formed after cooling, and finally the double-layer high-density Y2O3 etching-resistant coating is obtained. Through the double-layer structure design of APS bottoming and SPS top layer, grinding and annealing processes are combined to eliminate interlayer stress, corrosion resistance and dimensional stability are both considered, the preparation cost is lower than that of a full SPS coating, and the method is suitable for surface protection of cavity parts of semiconductor etching equipment.

The application discloses a surface treatment process of a valve core, adopts tungsten carbide and nickel-based alloy composite design, and remarkably improves the service life of the valve core under extreme environment. By introducing laser quenching treatment, the surface hardness and wear resistance are enhanced, and defects such as cracks are avoided. By adopting plasma spraying technology, the tungsten carbide powder is melted and high-speed sprayed to the surface of the valve core by means of high-temperature plasma flame, a dense, uniform and well-bonded coating is formed, and the wear resistance, corrosion resistance and sealing performance are improved. In addition, the ion nitriding treatment is used to generate a high-hardness nitride layer, forming a "hard shell-tough core" structure, and prolonging the wear resistance life. Finally, the grinding and polishing treatment is used to improve the surface flatness and smoothness, and ensure the sealing reliability. The application combines multiple advanced processes, remarkably improves the comprehensive performance of the valve core, and guarantees the stable operation of the valve under complex and severe working conditions.

The utility model relates to the technical field of plasma generator reaction, in particular to a multi-channel powder feeding device which structurally and mainly comprises an air source, a powder feeding mechanism and a plurality of powder feeding units. The powder feeding mechanism comprises a plurality of powder inlet pipes connected with the powder feeding units, a water inlet pipe, a water outlet pipe, a water cooling outer pipe, a water cooling inner pipe, a graphite mixing spray head, a plasma generator and a plasma flame. By means of the structure, a plurality of powder feeding pipes can be gathered together, various kinds of powder are mixed and then sprayed into plasma flames for high-temperature reaction, in this way, it can be avoided that one feeding system is used for each kind of powder, the whole structure is simpler, and cost is lower.

The utility model relates to the technical field of plasma flame detection, in particular to a plasma image flame detection probe, which comprises a protective tube and a protective seat fixedly mounted at the right end of the protective tube, a probe is arranged in the protective tube, an adjusting mechanism for adjusting the position of the probe is arranged in the protective tube, and a protective mechanism for protecting the probe is arranged in the protective seat. The adjusting mechanism comprises a mounting rod fixedly mounted in the protection tube, a first sliding rod is arranged in the mounting rod, a second sliding rod is arranged in the first sliding rod, one end, far away from the mounting rod, of the second sliding rod is fixedly connected with the probe, and the protection mechanism comprises a plurality of groups of protection plates rotationally mounted on the protection seat. According to the flame detection probe, the extension length of the probe is adjusted through the arranged adjusting mechanism, so that the flame detection probe can be adjusted to be proper in length according to actual use occasions, the use requirement is met, and the situation that the flame detection probe at a fixed distance influences judgment of a worker on the combustion stability of a boiler is avoided.

The present invention belongs to the technical field of nuclear power pipe cutting devices and discloses a plasma-flame composite cutting torch for cutting complex thick-walled stainless steel pipe fittings for nuclear power plants. The torch comprises a plasma cutting torch and a flame torch mounted thereon and capable of moving up and down along the axis of the plasma cutting torch. The flame torch is provided with an oxygen channel and a gas channel, respectively. The oxygen channel's gas outlet A and the gas channel's gas outlet B are located on the same horizontal plane, and the vertical distance between the oxygen channel's gas outlet A and the gas channel's gas outlet B and the plasma cutting torch's nozzle is 10 to 20 mm. By coaxially attaching a composite flame torch to an existing plasma cutting torch, the present invention reduces the energy and velocity losses of the plasma arc caused by the shock wave effect, thereby improving the capability and quality of plasma cutting and resolving the plasma cutting problem encountered by the full range of models during the AP1000 nuclear power plant thick-walled stainless steel pipe extrusion manufacturing process.

The present invention proposes a plasma ignition exciter with an adaptive flame adjustment function. The temperature monitor and the pressure monitor are set to monitor the working conditions of different temperature and different air pressure environments, and the environmental controller and the inverter controller are set to adjust the working state according to different working environments. The current controller is used to increase the input current, and the discharge controller is used to increase the discharge frequency to increase the output power, increase the plasma flame, and improve the ignition ability of the ignition exciter. This solves the problem that the traditional ignition exciter has a single output state during use and cannot meet the higher demand for ignition ability under harsh environmental conditions. It not only helps to improve the intelligence level of the ignition exciter, but also helps to improve the working stability and ignition ability of the engine in harsh environments.

Injector arrangement (20) for a burner, in particular a plasma burner (10), for carrying out a thermal coating process, comprising: an injector (30) which forms a feed channel (32) for feeding an abrasive filler material (80) which comes into contact with it during feeding to a combustion or plasma flame (100), an adapter (40) for connecting the injector (30) to a powder line (50); wherein the injector (30) and the adapter (40) are connected to each other but form separate parts, wherein the injector (30) is formed from a ceramic material.

The application provides a kind of plasma flame type wall-hanging stove, belongs to heating equipment technical field, the wall-hanging stove includes water outlet pipe, flue, combustion stove main body and pump water component, combustion stove main body includes stove shell, heat exchange pipe, heat conduction fin, wiping assembly and plasma torch generator;Plasma torch generator is located at the bottom of stove shell, for generating high-temperature plasma flame;Heat exchange pipe is S-shaped coiled in the position close to the top of stove shell, and its two ends are connected with water outlet pipe and pump water component respectively, and heat conduction fin is arranged at the interval in the gap of heat exchange pipe;Wiping assembly is arranged at the lower side of heat conduction fin, and is in contact with the lower surface of heat exchange pipe.The application effectively removes attached soot by wiping assembly sliding wiping the lower surface of heat exchange pipe when the wall-hanging stove is stopped, avoids dust layer to reduce heat exchange efficiency, and at the same time, S-shaped heat exchange pipe and heat conduction fin synergistically act to significantly increase heat exchange area, improve heat energy utilization rate.

The utility model discloses a plasma flame ablation generator, including a front end shell, an insulating shell and a gun air inlet joint, a gun air inlet joint is arranged at the rear end of the insulating shell, an insulating isolation sleeve is arranged in the insulating shell, a cathode rod is arranged in the insulating isolation sleeve, a cathode is connected to the left end of the cathode rod, an airflow ring is sleeved on the left outer circle of the cathode, an anode body is arranged on the left side of the airflow ring, a front end shell is connected to the left side of the anode body, an anode nozzle is arranged in the front end shell, a front end powder delivery section is arranged on the left side of the anode nozzle, and a front end powder delivery section is arranged. The utility model generates a plasma jet by a plasma spray gun, and heats the gas by igniting an arc with a high-frequency spark, ionizes the gas, and compresses the arc to generate a non-transfer plasma arc. After the high-temperature plasma gas is ejected from the nozzle, the volume expands rapidly to form a high-temperature and high-speed plasma jet. It is easy to use and simple to operate, and can realize testing in different scenarios.

The present invention provides a powder containing crystalline boron oxide particles, and provides a method for producing a powder containing crystalline boron oxide particles in a simple manner with a small number of steps. The powder according to the present invention contains crystalline boron oxide particles having a crystallinity of 20-100%. This method for producing a powder containing crystallized boron oxide particles comprises a step for supplying a carrier gas in which a boron oxide powder is dispersed into a hot plasma flame, and a step for generating boron oxide particles by supplying a cooling gas to a terminal part of the hot plasma flame.