133 results about "Metal droplets" patented technology

The invention belongs to the technical field of powder metallurgy, and discloses a novel double-circular-seam atomizer and an atomizing device.The novel double-circular-seam atomizer comprises an atomizer base body, a vertically-through melt channel is formed in the middle of the atomizer base body and used for allowing a flow guide nozzle to penetrate through, and the atomizer base body is provided with a cavity coaxial with the melt channel and a circular-seam spraying hole; the cavity is used for inputting high-pressure gas, and the circular seam spraying hole communicates with the cavity and is used for spraying out the high-pressure gas to form high-speed gas flow so as to break metal melt liquid flow flowing out of the flow guide nozzle. The number of the circular seam spraying holes is two, the two circular seam spraying holes are the first circular seam spraying hole and the second circular seam spraying hole, the second circular seam spraying hole surrounds the first circular seam spraying hole from the outer side of the first circular seam spraying hole, and on any longitudinal section plane of the atomizer base body, the jet flow center lines of the second circular seam spraying hole and the first circular seam spraying hole intersect at one point; the melt liquid flow crushing effect can be improved, the diffusion angle of metal liquid drops is increased, formation of large particles is reduced, and metal powder with smaller particle size and better sphericity degree is obtained.

A metal hybrid manufacturing apparatus includes a melted metal drop ejecting device and a metal deposition device. The melted metal drop ejecting device is operated to form perimeters of layers in a metal object being formed by the system. The metal deposition device is operated to fill interior portions of the layers.

The invention relates to the technical field of tritium extraction and discloses a double-resonance ultrasonic atomizing nozzle, a preparation method and a tritium extraction system.The double-resonance ultrasonic atomizing nozzle comprises a nozzle body and a vibration assembly, the nozzle body is provided with a nozzle opening and a first space for containing liquid metal, and the nozzle opening is communicated with the first space; and the vibration assembly is arranged in the first space, the vibration assembly is provided with at least two vibration ends extending from the first space to the nozzle, each vibration end generates ultrasonic waves through vibration, and every two adjacent vibration ends are arranged in a spaced mode and resonate with each other so that the liquid metal can be atomized. The double-resonance ultrasonic atomizing nozzle solves the technical problem of further strengthening the atomizing effect of lead and lithium liquid drops. According to the double-resonance ultrasonic atomizing nozzle, the atomizing effect of liquid metal can be enhanced, atomized metal liquid drops are more uniform, the dispersion effect of the liquid metal is improved, and the size of the metal liquid drops can be reduced.

The invention discloses a bimetallic composite material preparation method and system based on metal droplet size regulation and control, and belongs to the technical field of centrifugal casting. According to the method, aiming at a bimetal system with a liquid-liquid mixing and dissolving gap, an alloy melt is smelted according to a preset proportion, and then precise control over the size of second metal phase liquid drops is achieved in a casting ladle by regulating and controlling the standing time in combination with a high-temperature and high-speed camera shooting system. Then relevant casting parameters are input into an autonomously derived liquid drop movement speed and trajectory prediction model, the liquid drop position is predicted, and finally the centrifugal rotating speed or the heating power is adjusted through feedback control according to the deviation between a prediction result and a preset trajectory, so that directional preparation of different structures of the bimetal composite material is achieved. The corresponding system comprises a monitoring module, a calculation module and an execution module which cooperatively complete parameter monitoring, calculation analysis and precise regulation and control in the material preparation process. The casting inclusion defect can be reduced, the product quality instability is reduced, and directional preparation of different structures of the bimetal composite material is achieved.

The invention discloses a continuous and stable preparation device and method for a single-walled carbon nanotube, and relates to the technical field of nanocarbon material preparation, the continuous and stable preparation device for the single-walled carbon nanotube structurally comprises hollow graphite, a graphite crucible, a plasma electric arc furnace body, an air inlet and a discharge port, the hollow graphite serves as a cathode of the plasma electric arc furnace, and the graphite crucible serves as an anode of the plasma electric arc furnace. The plasma arc is initiated between the graphite electrodes, so that the plasma high-temperature evaporation catalyst is fully utilized, the defect of arc striking of a graphite cathode and a liquid catalyst anode in a conventional method is avoided, the evaporation rate of the catalyst is reduced, and the problem of arc breaking caused by metal droplet sputtering and coking in the liquid electrodes is solved; a series of defects of a conventional scheme are avoided through the convex crucible anode, so that the continuous stability of the reaction is greatly improved, and stable and continuous preparation of the single-walled carbon nanotube is realized.

The present invention belongs to the field of engineering thermophysics / aircraft safety technology, and relates to an observation device for droplet collision with a metal bottom plate and its application. The observation device of the present invention includes a lifting table, a data acquisition device, and a data analysis system. The experimental device can quantitatively measure the dynamic parameters such as the spreading radius, movement and sliding distance, and rebound height of the liquid droplet on the surface of the sample stage. At the same time, based on the light transmittance of the liquid droplet measured by a high-speed camera and the surface temperature of the liquid droplet measured by a high-speed infrared camera, the surface temperature distribution and phase change time of the liquid droplet can be studied. The data analysis uses a MATLAB program independently developed by the laboratory, which ensures the convenience and accuracy of data analysis. The entire system is of great significance for the research on the motion and phase change heat characteristic behaviors, laws, and mechanisms of water droplets impacting a solid cold surface or metal droplets impacting the surfaces of different metal materials.

The utility model relates to the technical field of electroslag furnaces, and discloses an electroslag furnace capable of water-cooling circulation cooling, which comprises an electric furnace for containing raw materials, a consumable electrode is arranged on the inner wall of the electric furnace, the bottom of the electric furnace is fixedly connected with a slag bath, and the bottom of the slag bath is fixedly connected with a liquid hopper; the device comprises a bottom support for bearing, the top of the bottom support is fixedly connected with a metal molten pool, the outer wall of the metal molten pool is fixedly connected with a water tank for containing water, the inner wall of the water tank is connected with four stirring rods through a transmission assembly so that the four stirring rods can synchronously rotate, and the bottom of the front side and the bottom of the right side of the water tank are each provided with a connecting pipeline. According to the cooling device, the four stirring rods are sequentially distributed, when the water suction pump pumps out hot water in the water tank and then injects cold water into the water tank to cool metal molten drops, the four stirring rods rotate to stir the cold water and the hot water in the water tank, so that the cold water and the hot water are mixed more uniformly, and cooling of electroslag ingots is not affected.

The present invention discloses a metal powder manufacturing device for improving the quality of intelligent manufacturing powder, including a smelting component, an atomizing component and a collecting chamber, wherein the collecting chamber is provided with a boosting component, the boosting component is used to eliminate the pressure distribution difference of the gas in the collecting chamber, and the atomizing component is provided with a gas pressure equalizing component, the gas pressure equalizing component is used to equalize the injection pressure of the atomizing gas. The present invention reduces the pressure distribution difference of the gas in the collecting chamber by installing a boosting component in the collecting chamber, and after the metal droplets are crushed by the high-pressure gas flow, the fine powder and the coarse powder fall along their respective crushing zones, the fine powder will not diffuse outward, the satellite powder generated is significantly reduced, and the smoothness of the metal powder is improved. The gas pressure equalizing component is installed in the atomizing component, and the pressure equalizing ring pipe and the gas equalizing pipe balance the gas, improve the stability of the outlet crushing airflow, reduce the difference in the distribution of the coarse powder particle diameter and the amount of fine powder generated, and improve the metal powder molding quality and the output of high-quality powder.

An apparatus for producing drops of liquid metal for additive manufacturing comprises a reservoir for supplying liquid metal and a pressure chamber in fluid communication with the reservoir. The pressure chamber has a channel therein where compressive forces are applied on the liquid metal therein. Upper and lower electrodes apply a current through the liquid metal in the pressure chamber. This current creates an electric field that produces radially inward directed Lorentz forces on the liquid metal. This compressive force provides pressure in the longitudinal direction for ejecting the liquid metal through the orifice to form liquid metal droplets.

The invention relates to an atomizer for preparing metal powder. The atomizer comprises a collecting tank; the melt cavity is arranged at the top of the collecting tank, and a liquid inlet with a sealing plate is formed in the top of the melt cavity; the nozzle is arranged at the bottom of the melt cavity and is positioned in the collecting tank; the pulse mechanism communicates with the melt cavity and is suitable for intermittently introducing gas into the melt cavity, and the metal solution flows out of the nozzle and forms continuous metal liquid drops; the rotating column is rotationally arranged in the collecting tank through a connecting assembly and located under the nozzle, and the metal liquid drops collide with the rotating column to form metal powder; molten metal solution is injected into the melt cavity from the liquid inlet, and the liquid inlet is sealed through the sealing plate; then, the rotating column rotates, meanwhile, gas is introduced into the melt cavity through the pulse mechanism, and therefore the metal solution can flow out of the nozzle to form continuous metal liquid drops; and the metal liquid drops collide with the rotating column and are atomized into spherical metal powder in the process, so that preparation of the metal powder is realized.

The invention relates to the technical field of additive manufacturing, in particular to a molten metal drop spraying additive manufacturing system and method.The core structure of the system is a multi-pole electric arc melting-molten metal drop spraying integrated composite sprayer, and continuous feeding metal wires are efficiently smelted through double-bypass MIG electric arcs; the pulse heating power generated by the central plasma arc in a high-frequency state is adjusted, and the molten metal is driven to be sprayed out from a nozzle below the spray head in cooperation with air pressure, so that jet deposition with stable and adjustable molten drop size and frequency is realized. According to the composite nozzle structure, a first-stage structure for achieving efficient metal smelting is composed of a center plasma arc-double-bypass MIG composite multi-pole arc and a feeding welding wire, and a second-stage structure for achieving metal rectification-injection is composed of a small funnel-shaped buffer cavity and a tail end nozzle. The system has the characteristics of small size, easiness in carrying, high integration, wide application range and the like.

The present disclosure relates to a liquid metal jetting ejection nozzle having a nozzle main body and a wetting plate. The nozzle main body has an enlarged opening at a distal end through which a molten metal feedstock material flows during a liquid metal jetting operation, and is formed from a first material having a first wetting characteristic. The wetting plate has an aperture and is secured to the enlarged opening of the nozzle main body. The wetting plate has a second wetting characteristic of a magnitude less than the first wetting characteristic to at least inhibit wetting. This two piece nozzle construction enables optimum materials and construction / fabrication techniques to be used for both components, thus improving performance, durability and reliability of the ejection nozzle.

The invention belongs to the technical field of additive manufacturing and surface modification of coatings on the inner walls of tubular parts, and particularly relates to a spraying method and device for the inner walls of long and thin tubular parts. According to the spraying method, laser is adopted for conducting irradiation melting on the end portion of the bar to form a liquid material, the motor drives the bar to rotate, and metal molten drops are thrown out at a high speed and deposited on the inner wall of the tubular part to form a coating. The spraying device comprises a laser irradiation system, a gas protection system, a rotary lifting system, a heating and heat preservation system, a recovery system and a control system. The preparation method has the advantages of remarkable capability of adapting to narrow space, high coating density, strong interface bonding force, environment friendliness and the like.

It is an objective of the present invention to provide a system for producing of fine spherical metallic powder that overcomes the limitations of the existing techniques, while enabling to precisely produce a metallic powder at adjustable properties. The general concept of the present invention is to provide a system for producing a fine spherical metallic powder, said system comprising: a) a reaction chamber with an inert atmosphere and a consumable electrode, said consumable electrode being connected to the positive side of the power source, thus acting as an anode; b) said reaction chamber further comprising a non-consumable electrode, being connected to the negative side of the power source thus serving as a cathode, c) the power source being enabled to provide an electric current for the generation of an electric arc dischargeable between the electrodes for melting parts of the consumable electrode, thereby forming droplets of molten metal; d) said reaction chamber being designed to allow an electromagnetic force and / or gravity forces to act on the metal droplets, thereby separating the metal droplets from the consumable electrode and enabling the metal droplets to acquire a spherical shape in flight under the action of surface tension and to undergo solidification; and e) a powder collecting box for collecting the solidified metal droplets.

This invention discloses an on-demand metal jet forming method based on forced vibration, belonging to the field of 3D printing technology, including the following steps: Step 1, calculating the resonant frequency f of the molten metal column in the nozzle. n Step 2: Determine the excitation frequency f of the forced vibration system; Step 3: Input an excitation signal with frequency f into the forced vibration system, which drives the nozzle to vibrate axially; The forced vibration of the nozzle includes an unstable start-up stage and a stable stage. After the nozzle vibration enters the stable stage, a stable metal droplet jet with frequency f is generated; Step 4: After obtaining the stable metal droplet jet, the base plate is subjected to three-dimensional motion, and metal deposition is performed using the metal droplet jet to complete the forming of the metal component. The spraying frequency of this invention can reach tens of thousands of hertz, which can greatly improve the manufacturing efficiency of droplet-spraying metal additive manufacturing.

A method for controlling temperature in a liquid metal three-dimensional (3D) printing system is disclosed, including ejecting a liquid metal drop from a nozzle onto a deposition location to form a portion of a three-dimensional object. The method also includes measuring a temperature at a measurement spot location offset from the deposition location, and comparing the measured temperature with a set point temperature in the deposition location, adjusting a cooling rate of the liquid metal drop. The deposition follows a toolpath to form the portion of the three-dimensional object. The measurement spot location can be located within the toolpath or outside of a toolpath of the three-dimensional object being formed. An additive manufacturing device configured to perform the method includes a printhead that includes a nozzle having an inner cavity, where the nozzle is configured for ejecting droplets of liquid metal drops to form a three-dimensional object.

The present disclosure relates to a system for additive manufacturing. The system includes a frame, a CNC bed configured with the frame. A metal dispensing mechanism configured to eject metal droplets on the CNC bed. The metal dispensing mechanism is configured to controllably move with respect to the CNC bed for manufacturing the object. The metal dispensing mechanism includes a first nozzle, functionally configured with the CNC bed, for controllably dispensing the metal droplets on the CNC bed, and the nozzle is fluidically configured with a reservoir having the metal. A piston configured with the reservoir, and the piston is configured to push the molten metal from the reservoir such the molten metal is released from the reservoir towards the first nozzle. The piston is made of thermally insulating material, and a transducer configured with the piston to facilitate mechanical jerking of the piston for facilitating the pushing of the molten metal from the reservoir.

A three-dimensional (3D) object printer has an ejector head with a single nozzle that is fluidly connected to a plurality of orifices in an orifice plate of the ejector head. An ejection of material through the single nozzle is emitted through the plurality of orifices simultaneously. In one embodiment, some of the orifices are oriented at an angle to an axis perpendicular to the orifice plate. This configuration enables a structure to be formed with a predetermined material density without needing to increase the ejection frequency significantly or requiring the printer to incorporate multiple ejector heads.

The invention provides a method and device system for continuously producing carbon nanotubes, and the method comprises the following steps: (1) carrying out high-temperature gasification on a metal raw material in a protective gas atmosphere to obtain a metal steam mixture; (2) the metal steam mixture obtained in the step (1) is subjected to rapid quenching through an annular air knife, and metal nanoparticles or metal liquid drops are obtained; (3) mixing a carbon precursor, an accelerant, reducing gas and the metal nano-particles or the metal liquid drops obtained in the step (2) to react, and separating to obtain the carbon nano-tubes; wherein the temperature of high-temperature gasification in the step (1) is greater than or equal to 2200 DEG C; the cooling rate of the rapid quenching in the step (2) is greater than or equal to 1 * 10 < 4 > DEG C / s. The industrial mass production of the carbon nanotubes is realized, the yield and quality of the carbon nanotubes are considered, the carbon source conversion rate is increased, the number of layers of the carbon nanotube walls is accurately controlled, retention and blockage of side reaction products are avoided, the reaction continuity is improved, and large-scale popularization and application are facilitated.

The invention discloses a laser precise regulation and control metal molten drop generation device and method. The laser precise regulation and control metal molten drop generation device comprises a molten drop heating device, a laser device, a laser head, a substrate, a control system, a quartz glass tube, a crucible and a spray hole. The control system is connected with the molten drop heating device and the laser, the molten drop heating device is used for melting a metal solid into molten metal, and the control system is used for adjusting the height of the quartz glass tube, changing the distance between the bottom of the quartz glass tube and the spray hole, monitoring the focus position of a laser beam and ensuring that the laser beam is accurately projected to the surface of the molten metal; laser beams are transmitted through the quartz glass tube and then act on the surface of molten metal, so that liquid metal is gasified to generate metal steam, and the molten metal below is pushed to be sprayed out through the spraying holes to form molten metal drops; according to position adjustment of the quartz glass tube, focus energy density of laser beams is controlled, and the size of metal molten drops is adjusted; and the purpose of accurately regulating and controlling the generation size of the metal molten drops is achieved by adjusting the laser power, the laser spot and the distance from the quartz glass tube to the spray hole.

Plasma coating equipment comprises an evaporation source assembly and a secondary ionization electrode device. The evaporation source assembly is configured to carry a target material and ionize a surface of the target material by arc discharge to generate a flow of coating particles. And the secondary ionization electrode device is arranged between the evaporation source assembly and the workpiece to be coated. And the secondary ionization electrode device is configured to perform arc discharge on the coating particle flow flowing through the secondary ionization electrode device so as to further heat and ionize the metal liquid drops in the coating particle flow.

The present invention discloses a device for spraying high-melting-point metal droplets on demand by using the water hammer effect, comprising a crucible, an electromagnetic induction heating system, a nozzle and a nozzle driving system. The crucible is filled with high-melting-point metal and has a small hole at the bottom. The electromagnetic induction heating system is used to heat and melt the metal and keep the temperature of the molten metal above the melting point. The top of the nozzle is connected to the nozzle driving system, and the bottom extends into the crucible and passes through the small hole, and the small hole and the nozzle are in clearance fit. The upper side wall of the nozzle is provided with a vent hole connected to the atmosphere, the lower side wall is provided with a liquid inlet hole, and the bottom end is provided with a spray hole. The nozzle driving system is used to drive the nozzle to achieve sub-millimeter reciprocating movement along its axial direction. The water hammer pressure generated by the molten metal itself in the nozzle serves as the spraying power of the molten metal. It only needs to apply a small reciprocating displacement along its axial direction to the nozzle to realize the spraying of any high-temperature molten metal on demand, and the whole device has high working reliability.

The invention discloses a micro-structure printing and interface bonding method for T / R assembly heat dissipation, and belongs to the field of high-silicon-aluminum surface heat dissipation micro-structure forming. Sequentially carrying out three-stage pretreatment of chemical corrosion, ultrasonic vibration grinding and metal wire drawing on the surface of the high-silicon aluminum matrix to obtain the high-silicon aluminum matrix surface with enhanced adhesive force; removing the aluminum element on the surface of the high-silicon aluminum substrate through chemical corrosion, so that the silicon particles on the top are exposed on the surface; removing silicon particles exposed on the surface by ultrasonic vibration grinding; processing lines on the surface after the silicon particles are removed through metal wire drawing; heating the high-silicon aluminum substrate with enhanced adhesive force, and depositing aluminum liquid drops on the surface of the high-silicon aluminum substrate in an inert gas environment through a uniform metal micro-drop spraying device; a heat dissipation microstructure is formed through layer-by-layer printing, liquid drops on the first layer are metallurgically bonded with a high-silicon-aluminum matrix through laser melting, and subsequent layers are fused through waste heat. The method solves the problems that the wettability of high-silicon aluminum is poor, and an oxide layer hinders combination.

An oxide dispersion strengthened metal powder for 3D printing and a preparation method therefor. The method comprises the following steps: S1, a smelting process: putting a metal ingot into a vacuum smelting furnace or powder making device integrated feeding system, vacuumizing and melting at a high temperature into a molten state to obtain a melt; S2, an atomization process: putting the melt into a powder making device, the melt generating small metal droplets in a reaction chamber to form fine spherical metal powder, and sieving the fine spherical metal powder under a protective atmosphere to collect fine spherical metal powder of required granularity, wherein oxygen is doped in the smelting process and / or the atomization process. Oxide particles can be dispersed inside and outside the metal powder, the problem that oxide can only be added on the surface in thermal oxidation and mechanical grinding is solved, the laser absorptivity is increased, and the 3D printing performance of the metal powder is improved.

Systems and methods for creating molten metal droplets are disclosed. The systems may be used for 3D printing. The system relies on a change in momentum of the droplet relative to the tip of the metal microwire to cause the droplet to separate from the tip of the metal microwire. The change in momentum can be created using a force generator. In some embodiments, the system can adjust electrical parameters to form metal droplets with desired parameters.

A method of operating a three-dimensional (3D) metal object manufacturing apparatus selects operational parameters for operation of the printer to form conductive metal traces on substrates with dimensions within appropriate tolerances and with sufficient conductive material to carry electrical currents without burning up or becoming too hot. The method identifies the material of the substrate and the bulk metal being melted for ejection and uses this identification data to select the operational parameters. Thus, the method can form conductive traces and circuits on a wide range of substrate materials including polymeric substrates, semiconductor materials, oxide layers on semiconductor materials, glass, and other crystalline materials.

Provided in the present invention is a micro-bump laser printing method for packaging a three-dimensional integrated circuit. The method comprises: placing, on a chuck below a donor film, a chiplet on which micro-pads have been prepared; and using pulsed laser to irradiate the donor film by means of aligning the pulsed laser with the donor film, such that the donor film is partially molten and generates metal droplets for spraying, and the metal droplets are deposited on surfaces of the micro-pads, and are then cooled and solidified to form a metal micro-bump array. In the present invention, the micro-bumps are prepared by means of laser direct-writing printing without requiring a mask, thereby realizing a simple process flow and a short period; micro-bump arrays having different sizes and position distributions are prepared by means of changing the sizes of laser spots and the position at which the donor film is irradiated, thereby realizing high process flexibility; and micro-bumps having different components are prepared by means of replacing the material of the donor film, thereby realizing a wide material application range.

The invention provides a method and device for estimating the steam eruption impact behavior in a laser-induced keyhole, and belongs to the technical field of laser material processing.The method comprises the steps that a metal molten drop is arranged above the laser-induced keyhole, and a high-speed camera is used for shooting a transition image of the metal molten drop above the keyhole; obtaining a relation curve of the flight speed of the metal droplet along with time change through image analysis, and obtaining the position when the resultant force is zero; stress analysis is conducted on the metal molten drops with the resultant force being zero; and the jet steam impact force borne by the metal molten drops at the position is obtained through the static equilibrium theory. By adopting the method and the device for estimating the impact behavior of the steam eruption in the laser-induced keyhole, the specific numerical value of the pressure of the steam eruption in the high-power laser-induced keyhole can be estimated, and the research on laser-induced metal steam is facilitated. The experimental method is simple and easy to implement, small in calculation amount and suitable for measuring the pressure of the steam erupted in the laser-induced keyhole of various metal materials under different machining conditions.

The invention discloses a drop tube metal microdroplet deposition device and method for simulating a space environment. The device comprises a drop tube; a metal microdroplet nozzle is mounted at the top of the drop tube, a composite substrate is arranged below the metal microdroplet nozzle, a replaceable tested substrate is arranged in the middle of the composite substrate, and two ends of the composite substrate are matched with a release mechanism arranged on the inner wall of the drop tube; a transparent window is arranged on the side wall of the drop tube below the composite substrate, and an image collecting device is arranged on one side of the window; when the metal liquid drops of the experimental metal material start to fall off from the metal micro-drop spray head, controlling the release mechanism to release the composite substrate after a preset time; the metal liquid drops and the composite substrate are pursued and contacted in a weightlessness falling state, are captured and recorded by the image acquisition device through the window, and then are transmitted to the upper computer for subsequent analysis. The technical problem that in the prior art, the contact solidification process of the metal liquid drops and the substrate in the space microgravity environment cannot be truly simulated on the ground is solved.

The application relates to the technical field of extreme ultraviolet light generation, in particular to a magnetic levitation potential well coagulation device and a metal droplet coagulation method. The magnetic levitation potential well coagulation device comprises a magnetic potential well generator, a detection sensor and a controller. The magnetic potential well generator is arranged at the downstream of a metal droplet generator, and the magnetic potential well generator is configured to generate a magnetic potential well to generate a force on the metal droplets output by the metal droplet generator, and the force can reduce the movement speed of the metal droplets. The detection sensor is arranged at the downstream of the magnetic potential well generator, and the detection sensor can detect the size of the metal droplets. The detection sensor and the magnetic potential well generator are in communication connection with the controller, and the controller is configured to control the start, the stop and the adjustment of the strength of the magnetic potential well generator according to the detection result of the detection sensor. The metal droplet coagulation method can make the size of the metal droplets meet the generation requirements of extreme ultraviolet light when applied to the above-mentioned magnetic levitation potential well coagulation device.