36 results about "Plasma rotation" patented technology

A plasma system includes a plasma arc torch, a cylindrical tube and an eductor. The plasma arc torch includes a cylindrical vessel having a first end and a second end, a first tangential inlet/outlet connected to or proximate to the first end, a second tangential inlet/outlet connected to or proximate to the second end, an electrode housing connected to the first end such that a first electrode is (a) aligned with a longitudinal axis of the cylindrical vessel, and (b) extends into the cylindrical vessel, and a hollow electrode nozzle connected to the second end of the cylindrical vessel. The cylindrical tube is attached to the hollow electrode nozzle and aligned with the longitudinal axis, the cylindrical tube having a side inlet and a radio frequency coil disposed around or embedded within the cylindrical tube. The eductor is attached to the cylindrical tube and aligned with the longitudinal axis.

The present invention includes electromagnetic methods and apparatus to form a sustained direct current loop in a conductive fluid such as plasma for applications including gas discharge arc lamps and fusion confinement systems. The current loop is driven by rotating plasma within a stationary magnetic field perpendicular to the axis of rotation. Polyphase rotating electric or magnetic fields drive the plasma rotation, and the interaction between the rotating plasma and the stationary field forms and sustains the current loop. Plasma cooling and contamination are minimized since, unlike conventional direct current drive methods and apparatus, no electrodes contact the plasma.

The invention provides a high-density Ti2AlNb powder alloy near-net forming technology.The technology comprises the following steps that 1, a Ti2AlNb alloy bar is smelted by taking components of Ti2AlNb-based alloy as ingredients; 2, the alloy bar processed through finish turning is put into plasma rotation electrode powder preparing equipment, and the Ti2AlNb alloy bar is prepared into Ti2AlNb spherical powder under the inert gas shielding condition; 3, the prepared Ti2AlNb spherical powder is located into a stainless steel or low-carbon steel sheath; 4, the sheath which contains the Ti2AlNb spherical powder and is compacted through vibration is degassed; 5, hot isostatic pressing forming is performed on the degassed sheath.The Ti2AlNb powder alloy prepared through the method has the isotropic character and is high in density degree, uniform in tissue and component, excellent in mechanical property and capable of achieving Ti2AlNb alloy parts with the large size and complex shapes.

The invention discloses a rotating electrode preparing micro spherical metal powder and a method of the rotating electrode. A plasma gun is composed of a Laval spraying pipe and a plasma gun head capable of conducting axial feeding, and a plasma gun inner gas way is formed between the plasma gun head and the Laval spraying pipe. The plasma gun head is connected with a gun head push rod, and a rotating electrode bar is connected with an electrode bar push rod. The axial relative position of the rotating electrode bar and the axial relative position of the plasma gun head are controlled and adjusted through the electrode bar push rod and the gun head push rod. A cylinder electrode bar is used as the raw material, and a plasma rotation electrode process is used for conducting the first time of atomization; supersonic speed high-temperature inert gas exerted to an electrode bar melting pool and injected by the adjustable plasma gun head is used for conducting the second time of atomization; centrifugal force of a centrifugal atomization mechanism overcomes tension on the surface of alloy liquid to serve as the upper limit of the atomization collected powder granularity; the efficiency of converting atomization energy into atomization drop surface energy is greatly improved; and the yield of micro powder smaller than 50 microns is greatly increased compared with traditional centrifugal atomization.

The invention relates to a method for preparing high temperature alloy GH 4169 metal globule powder by utilizing a centrifugal process of an auxiliary plasma rotation electrode. Glow discharge plasma arcs are generated between the auxiliary plasma electrode and a consumption-type electrode made of cylindrical rotary high temperature alloy GH 4169 metal in a closed container under the protection of inert gases; one section of the high temperature alloy GH 4169 metal electrode near the plasma arcs is heated to form small drops of liquid via the high temperature generated by the plasma arcs; the small drops of liquid are thrown around through the centrifugal force; then the small drops of liquid of the high temperature alloy GH 4169 metal are air-cooled and solidified to form globules in the inert atmosphere of inert gases in the closed container so as to obtain high temperature alloy GH 4169 metal globules. In the method, the high temperature alloy GH 4169 metal globules with an average sphere diameter of 0.09-1.6mm and better monodispersity can be obtained. The prepared powdered metal globule has good sphericity, lower rate of abnormal particles and controllable sphere diameter. The method can be used for preparing special members of aerospace planes in the field of the laser solid shaping process.

The invention proposes a preparation method of nickel-based high-temperature alkene alloy powder; and a wet mixing method is adopted to prepare the nickel-based high-temperature alkene alloy powder. Firstly, a graphene oxide slice is selected to dissolve in water to prepare a certain amount of graphene oxide solution; then, high-temperature alloy powder prepared by an argon atomizing method (AA) or a plasma rotating electrode method (PREP) is added to the graphene oxide solution, ultrasonic vibration stirring is performed to disperse the graphene oxide slice on the surfaces of high-temperature alloy powder particles; mixed graphene oxide/high-temperature alloy powder is washed, filtered and put in a drying oven for drying; and finally, the dried graphene oxide /high-temperature alloy powder is put into a stainless steel sheath, and vacuum degassing and heating are performed to prepare graphene/high-temperature alloy composite powder.

An injection system for introducing feed material into a plasma mass filter includes an injector for producing a jet of feed material. For a plasma mass filter having a cylindrical wall that surrounds a plasma chamber, the injector is mounted to the outside of wall and oriented to deliver a feed jet into the plasma chamber. Specifically, the injector is oriented to deliver a jet that is directed toward a target volume in the chamber that is located substantially on the longitudinal axis defined by the cylindrical wall. More specifically, the feed material is injected into the chamber to the target volume along a path that is transverse to the direction of plasma rotation in the chamber. A vaporization energy source can be included to generate and direct an energy beam toward the target volume to vaporize the jet of feed material as the jet arrives at the target volume.

A system and method for generating a plasma. An embodiment of the system for generating a plasma may include a first electrode; a second electrode disposed adjacent the first electrode; a first power supply for supplying power at the second electrode; a second power supply for generating a magnetic field; and a sequencer for coordinating a discharge of power from the first power supply and a discharge of power from the second power supply. The first power supply may be configured such that the discharge of power from the first power supply generates a plasma between the first electrode and the second electrode. The second power supply may be configured such that the magnetic field generated by the discharge of power from the second power supply rotates the plasma.

Provided is a manufacturing method of a titanium alloy electrode bar for a plasma rotation electrode. The manufacturing method includes the following steps that step1, a blank is prepared, wherein a titanium alloy ingot serves as the blank and meets the GB/T2965-2007 standard; step2, a quick forging press is used for performing blooming forging on the titanium alloy ingot, wherein blooming forging is completed through 2-4 times of heating, and a primary forged blank is obtained after air cooling; step3, hammer forging equipment is used for performing upsetting and rolling forging on the primary forged blank, and forging is performed on an intermediate forged blank obtained after water cooling through 4-6 times of heating; step4, a precision forging machine is used for performing precision forging on the intermediate forged blank obtained in the step3, and a semi-finished bar is obtained after air cooling; step5, heat treatment is performed; step6, heat straightening is performed; step7, a lathe is used for performing turning on the semi-finished bar obtained after heat straightening and air cooling so that the finished titanium alloy electrode bar for the plasma rotation electrode can be formed; step8, finishing treatment is performed; finally, appearance inspection is performed on the finished titanium alloy electrode bar for the plasma rotation electrode. The manufacturing method has the advantages that the production cycle is short, the service life is long and economic benefits are good.

The invention discloses a preparation method of a refractory high-entropy alloy skeleton-copper spontaneous perspiration composite structure. The method comprises the following steps of: smelting a refractory high-entropy alloy raw material to obtain an alloy ingot, and preparing refractory high-entropy alloy powder from the alloy ingot by using a plasma rotating electrode atomization method; forming the refractory high-entropy alloy powder into a preset porous skeleton structure through an electron beam or selective laser melting additive manufacturing process; and infiltrating metal copper into the porous skeleton structure by adopting an infiltration process, thereby obtaining the refractory high-entropy alloy skeleton-copper spontaneous perspiration composite structure. The structure has the characteristic of spontaneous perspiration, and is suitable for high-temperature parts such as rocket engine nozzle throat inserts, thrust chamber injector panels, missile warhead nose cones and electromagnetic gun tracks. The prepared composite structure has the advantages that the forming process is simple, the porosity can be conveniently designed and adjusted according to actual requirements, the mechanical property is good, high temperature resistance and thermal shock resistance can be achieved, and high practical value is achieved.

A plasma rotation electrode powder production feeding device comprises a material box upper cover which is connected with a material box; a feeding hole is formed in the top of the material box upper cover; the feeding hole is sealed through a feeding hole sealing device; a material cabin is distributed inside the material box; the material box is matched with a discharging sliding plate through a shifting fork at the bottom of the material box; the discharging sliding plate is connected with a plasma rotation electrode powder production device; a flange connector is connected with a vacuum and inert gas system; raw material bars are sequentially arranged inside the material cabin from the feeding hole, after the material cabin is filled up, the feeding hole sealing device is started to enable the feeding hole sealing device and the material box upper cover to be well sealed, the vacuum system is started to enable gases inside the device to be extracted from the flange connector, and then inertia protective gases are inflated inside the device; the material cabin is rotated, meanwhile a shifting fork motor is started to enable the shifting fork to rotate, then bar materials enter the shifting fork from the material cabin, the shifting fork rotates, and when the material cabin rotates to an opening below, the bar materials are sent to the plasma rotation electrode powder production device along the discharging sliding plate. The plasma rotation electrode powder production feeding device is simple in structure, convenient to operate, time-saving, labor-saving, safe and reliable.

A device and method for magnetic field confinement of plasma is formed by a cylindrically stacked column of direct current-carrying magnetic field coils with electrodes adjacently interior to each magnetic field coils so as to induce plasma rotation about an annular confinement region. Each field coil produces a magnetic field alternating in direction relative to adjacent coils and, so as to maintain consistent overall azimuthal direction of plasma rotation, electric field electrodes alternate accordingly in polarity along the axial length of the device. The device may be used for inducing nuclear fusion, for the ionic or isotopic separation of elements, creation of thrust by ejecting mass along the axial direction of the device, for creating a gravitational acceleration field, and for creating a state change beyond plasma.

A system and method for generating a plasma. A first electrode and a second electrode are disposed adjacent to one another, not touching one another. A first power supply supplies power at the second electrode, and a second power supply generates a magnetic field. A sequencer coordinates a discharge of power from the first power supply and a discharge of power from the second power supply. The first power supply may be is configured such that the discharge of power from the first power supply generates a plasma between the first electrode and the second electrode. The second power supply is configured such that the magnetic field it generates rotates the plasma. Depending upon disclosed relative geometries of the electrodes and the magnetic field, the plasma is shaped alternatively as a disc, a dome, a sleeve, or a polygonal sheet.

The invention discloses a method for improving room-temperature fracture toughness of an Nb-Si-based multi-element alloy, and belongs to the field of super-high-temperature structural materials. Nb-Si-based multi-element alloy powder with a micro-submicron-grade phase dimension is prepared under a vacuum condition by applying a plasma rotation electrode atomizing method, taking a Nb-Si-based multi-element alloy rod as a rotation electrode, taking a plasma beam as a heating source and reasonably setting the rotation speed and plasma beam power parameters. By taking the powder as a raw material, an Nb-Si-based multi-element alloy ingot with a uniform and compact structure is prepared by sintering through a discharge plasma technology; and a microscopic structure is composed of a micro-submicron-grade NbSS solid solution and an Nb5Si3 strengthening phase. According to the method, a Nb-Si-based multi-element alloy structure is refined by combining a plasma rotation electrode atomizing technology with a discharge plasma sintering technology, so that the room-temperature fracture type of the NbSS solid solution phase in the Nb-Si-based multi-element alloy is converted into ductile dimple type fracture from cleavage type fracture under a conventional coagulation condition, and therefore, the room-temperature fracture toughness of the Nb-Si-based multi-element alloy is greatly improved. The preparation method for the refined Nb-Si-based multi-element alloy structure is relatively high in practicability.

The invention discloses a preparation process of multi-component spherical alloy powder, the multi-component spherical alloy powder is prepared by adopting a plasma rotation electrode atomization (PREP) method, the multi-component alloy comprises at least one of refractory metals and compounds thereof, and the multi-component alloy specifically comprises tungsten, molybdenum, tantalum, niobium, rhenium, tungsten carbide, tantalum carbide and the like. The multi-component spherical alloy powder containing the refractory metal or the compound of the refractory metal is prepared through the PREP method, the prepared multi-component spherical alloy powder is high in sphericity degree, good in fluidity, high in tap density and low in impurity element content, the yield of hollow powder and satellite powder is small, and compared with other preparation methods, the prepared alloy powder is more excellent in performance and better in performance. The material is an ideal material for metal 3D printing; in addition, the invention also solves the problem that a round bar containing refractory metal or a compound base material thereof used in a PREP method is difficult to prepare, and provides a spatial structure netting method or an element direct mixing method or a porous skeleton method to prepare the multi-component alloy bar.