CN111097918A - A device and method for preparing metal powder - Google Patents
A device and method for preparing metal powder Download PDFInfo
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- CN111097918A CN111097918A CN201811250980.5A CN201811250980A CN111097918A CN 111097918 A CN111097918 A CN 111097918A CN 201811250980 A CN201811250980 A CN 201811250980A CN 111097918 A CN111097918 A CN 111097918A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
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Abstract
The invention discloses a device and a method for preparing metal powder, wherein the device comprises a powder making chamber, a powder collecting chamber positioned at the bottom of the powder making chamber, a power supply for providing power for the device, a rotary supply mechanism positioned at one side of the powder making chamber and used for rotating and propelling a rod-shaped anode, the rod-shaped anode positioned in the rotary supply mechanism, a gas transmission system, a plasma torch and a plasma torch nozzle which are sequentially arranged at the other side of the powder making chamber, wherein the rotary supply mechanism, the rod-shaped anode, the gas transmission system, the plasma torch and the plasma torch nozzle are coaxially arranged, the rod-shaped anode is opposite to the plasma torch nozzle, an adiabatic expansion mechanism is mechanically and hermetically connected to the outer side of the powder making chamber, the adiabatic expansion mechanism comprises a transmission mechanism and a valve plate, and the transmission mechanism acts on the valve plate, for changing the volume of the adiabatic expansion mechanism. The powder prepared by the invention has small granularity.
Description
Technical Field
The invention relates to the field of powder metallurgy, in particular to a device and a method for preparing metal powder with small granularity.
Background
In the fields of powder metallurgy, metal material 3D printing, spraying and the like, metal powder is a core raw material, a preparation method of the metal powder is a traditional atomization method, a ball milling method, a gas atomization method and the like, plasma torch rotating electrode powder manufacturing is a newly developed industrialized metal powder manufacturing method, particularly in powder preparation of refractory materials and rare metal materials, because a high energy density source can easily melt metal, powder particles are obtained by a centrifugal liquid drop throwing method instead of the atomization method and the like, and are atomized by gas blowing, so that extra energy required by a large amount of heated gas in a gas blowing and atomizing process is saved, and the metal, particularly the refractory metal, is rapidly and efficiently liquefied and is manufactured.
However, since the existence of a large amount of cold gas is lacking, the thrown-out droplets are surrounded by high-temperature gas, and rapid cooling solidification is difficult to achieve, and a plurality of droplets are melted again to form larger droplets and then solidified, coarse particles in the obtained powder occupy a main position in the powder preparation by the rotating electrode, and the thrown-out droplets are large due to the slow rotation speed of the electrode, and the droplets are coarse due to the reaggregation.
Because high-speed cold gas flow is not available for cooling and controlling the trend of the metal liquid drops, the high-temperature metal liquid drops can fly to the plasma torch nozzle and deposit, so that the plasma torch nozzle is blocked, and the service efficiency and the service life of the plasma torch are seriously influenced.
Disclosure of Invention
The invention aims to provide a device and a method for preparing metal powder, which solve the defects that a plasma torch is easy to block, an electric arc is unstable, and the obtained powder has more coarse particles in the process of preparing powder by a rotating electrode in the prior art.
In order to solve the above problems, the present invention provides an apparatus for preparing metal powder, comprising a powder making chamber, a powder collecting chamber located at the bottom of the powder making chamber, a power supply for providing power to the apparatus for preparing metal powder, a rotary supply mechanism located at one side of the powder making chamber and used for rotating and propelling a rod-shaped anode, a rod-shaped anode located in the rotary supply mechanism, a gas transmission system, a plasma torch and a plasma torch nozzle located at the other side of the powder making chamber in sequence, wherein the rotary supply mechanism, the rod-shaped anode, the gas transmission system, the plasma torch and the plasma torch nozzle are coaxially arranged, and the rod-shaped anode and the plasma torch nozzle are opposite, wherein an adiabatic expansion mechanism is mechanically and hermetically connected to the outer side of the powder making chamber, the adiabatic expansion mechanism comprises a transmission mechanism and a valve plate, the transmission mechanism acts on the valve plate for changing the volume of the adiabatic expansion mechanism.
Preferably, the device still includes evacuation system, evacuation system includes vacuum pump, double control valve and vacuum chamber, the vacuum pump pass through double control valve connect in the powder process chamber, vacuum chamber one side connect in adiabatic expansion mechanism, the opposite side via double control valve connect in the vacuum pump, the vacuum pump is used for controlling through double control valve the powder process chamber with the vacuum degree of vacuum chamber.
Preferably, a cold water jacket is arranged on the surface of the pulverizing chamber.
Preferably, the adiabatic expansion mechanism is located in a vertical direction of the rotary feeding mechanism, the rod-shaped anode, the gas delivery system, the plasma torch, and the plasma torch nozzle, which are coaxially arranged.
Preferably, the adiabatic expansion mechanism is a piston mechanism.
Preferably, the adiabatic expansion mechanism in an operating state forms a space volume 10% to 100% larger than that of the pulverizing chamber.
Preferably, the transmission mechanism of the adiabatic expansion mechanism can realize crankshaft reciprocating motion, vertical pulling motion or pneumatic cylinder pushing motion.
Preferably, the working pressure of the pulverizing chamber is controlled between 1/100 atmospheric pressure and 10 atmospheric pressure by the vacuum-pumping system and the gas transmission system.
Preferably, the operating frequency of the plasma torch is between 1 and 100kHz and the operating frequency of the adiabatic expansion mechanism is between 1 and 100kHz, the operating frequencies of the plasma torch and the adiabatic expansion mechanism being capable of being coupled.
Preferably, the rod-shaped anode has a diameter of between 1mm and 100cm and a rotation speed of between 1 and 100000 rpm.
Preferably, the rod-shaped anode has a diameter of between 1cm and 10 cm.
Preferably, the power supply power of the plasma torch is between 1 and 500kW, and the operation mode is direct current discharge or pulse discharge.
In order to solve the above problems, the present invention also provides a method for preparing metal powder using the apparatus, the method comprising the steps of: in the powder making process of the powder making chamber, under the action of a plasma torch, a rod-shaped anode serving as a powder making raw material is melted and evaporated, and under the action of a rotary centrifugal force, the rod-shaped anode leaves the rod-shaped anode in a metal liquid drop form; the powder preparation device is characterized in that in the powder preparation process, the transmission mechanism acts on the valve plate to drive the heat insulation expansion mechanism to work, and the volume of the heat insulation expansion mechanism is increased.
Preferably, the method further comprises the steps of: before the milling process, vacuumizing the milling cavity by using a vacuum pump; and in the process that the transmission mechanism acts on the valve plate to drive the adiabatic expansion mechanism to work, stopping vacuumizing the powder preparation chamber and starting vacuumizing the vacuum chamber.
Compared with the prior art, the invention has the beneficial effects that: in the traditional rotary electrode powder process, the adiabatic expansion mechanism is added to work simultaneously, so that a more appropriate working pressure environment is established on one hand, and on the other hand, the environmental temperature is reduced, the metal liquid drops are cooled rapidly, and the powder characteristics are optimized. The invention is beneficial to overcoming the defects that the plasma torch is easy to block, the electric arc is unstable, the obtained powder has more coarse particles and the like in the conventional rotating electrode powder making process, further improving the powder making efficiency, and the particle size of the prepared powder is smaller.
Drawings
FIG. 1 is a schematic structural view of an apparatus for manufacturing metal powder according to the present invention;
fig. 2 is a schematic structural diagram of an apparatus for preparing metal powder including a vacuum-pumping system in a preferred embodiment of the present invention.
Reference numerals:
1 is a rod-shaped anode; 2 is a plasma torch flame; 3 is a plasma torch nozzle; 4 is a plasma torch; 5 is a gas transmission system; 6 is a power line; 7 is a power supply; 8 is a valve plate; 9 is a transmission mechanism; 10 is the initial position of the valve plate of the adiabatic expansion mechanism; 11 is a milling chamber; 12 is a vacuum chamber; 13 is a vacuum pump; 14 is a double control valve.
Detailed Description
The above features and advantages of the present invention, and those that characterize it, will be apparent from the following more particular description of the invention, taken in conjunction with the accompanying drawings, in which like reference characters refer to the same parts throughout the different views.
The gas pressure of the powder making cavity is one of main process parameters in the powder making process, and if the pressure of the powder making cavity is high, the metal liquid drops can obtain more collision opportunities in the same space and can be cooled more quickly to form powder particles and a smaller powder making cavity space; however, higher chamber pressures, because the gas has a higher probability of being heated by the droplets, also means higher gas temperatures, more droplets recombine to form larger droplets and particles, and plasma torch nozzles are more prone to metal deposition and clogging; at higher pressures, the spacing between the torch and the metal anode must be correspondingly shortened, otherwise the torch tends to extinguish the arc.
During adiabatic expansion of a gas, the temperature of the gas will drop significantly, according to the equation for adiabatic expansion of an ideal gas: TV (television)γ-1Which is a constant number of times that the number of the first and second electrodes,
the value of γ -1 is generally 0.3 to 0.7, and it is known that if the space size after adiabatic expansion is 1.1 times, 1.5 times, or 2 times the original space, γ -1 is 0.5, and the temperature after adiabatic expansion is about 0.95, 0.816, or 0.71 times the original temperature, and if the temperature before adiabatic expansion is 100 ℃, the corresponding temperature values are 95 ℃, 81.6 ℃, and 71 ℃, respectively; the obvious reduction of the gas temperature drives the temperature of the metal liquid drop to be rapidAnd the powder is reduced and solidified, so that the powder making speed is improved, and the powder making effect is optimized. The present invention is based on the above principle and combines adiabatic expansion with the prior art rotary electrode milling.
As shown in fig. 1, a schematic structural diagram of an apparatus for preparing metal powder according to the present invention is shown. Wherein, the device comprises a powder making chamber 11, a powder collecting chamber (not shown in the figure) positioned at the bottom of the powder making chamber, a power supply 7 for providing power for the device for preparing the metal powder, a rotary feeding mechanism positioned at one side of the powder making chamber 11 and used for rotating and propelling a rod-shaped anode 1, the rod-shaped anode 1 positioned in the rotary feeding mechanism, a gas transmission system 5, a plasma torch 4 and a plasma torch nozzle 3 which are sequentially arranged at the other side of the powder making chamber 11, wherein the rotary feeding mechanism, the rod-shaped anode 1, the gas transmission system 5, the plasma torch 4 and the plasma torch nozzle 3 are coaxially arranged, the rod-shaped anode 1 is opposite to the plasma torch nozzle 3, the plasma 4 is used as a cathode to jet a plasma torch flame 2 through the plasma torch nozzle 3, acting on the rod-shaped anode 1 to melt and evaporate the rod-shaped anode 1, and leaving the rod-shaped anode 1 in the form of metal droplets under the action of a rotating centrifugal force; and cooling and solidifying the metal liquid drops to form powder. The adiabatic expansion mechanism is connected to the outer side of the pulverizing chamber 11 in a mechanical sealing mode, the adiabatic expansion mechanism comprises a transmission mechanism 9 and a valve plate 8, and the transmission mechanism 9 acts on the valve plate 8 and is used for changing the volume of the adiabatic expansion mechanism. The gas delivery system 5 is used for delivering process gas during the milling process, usually inert gas which does not chemically react with the metal raw material, such as Ar or N2. Furthermore, if a certain content of compounds is desired, e.g. oxides, carbides, nitrides, the corresponding O is introduced2Carbon-containing gases, nitrogen-containing gases, and the like. The device of the invention can reduce the pressure of the powder making chamber from the inside by utilizing the volume change of the adiabatic expansion mechanism, thereby further reducing the temperature of the metal liquid drops.
As shown in fig. 2, some of the same components as in fig. 1 are not shown, for example, the rod-shaped anode 1, the torch flame 2, the torch nozzle 3, the torch 4, the gas delivery system 5, the power line 6 and the power supply 7 are not shown in fig. 2. Fig. 2 highlights the vacuum pumping system, i.e. the apparatus further comprises a vacuum pumping system, which comprises a vacuum pump 13, a double control valve 14 and a vacuum chamber 12, wherein the vacuum pump 13 is connected to the pulverizing chamber 11 through the double control valve 14, one side of the vacuum chamber 12 is connected to the adiabatic expansion mechanism, and the other side is connected to the vacuum pump 13 through the double control valve 14, and the vacuum pump 13 is used for controlling the vacuum degree of the pulverizing chamber 11 and the vacuum chamber 12 through the double control valve 14. The vacuum pumping system is used for vacuumizing the pulverizing chamber 11 and the vacuum chamber 12.
Preferably, a cold water jacket is arranged on the surface of the pulverizing chamber 11. At various interfaces, special pipelines or spaces for introducing cooling water can be arranged and designed to have the pipeline or space characteristics with the best cooling effect, and the cooling water is used for ensuring the stable working state of the powder making cavity 11 and is also beneficial to the preparation of powder and the improvement of yield.
Preferably, the adiabatic expansion mechanism is located in a vertical direction of the coaxially disposed rotary feeding mechanism, the rod-shaped anode 1, the gas delivery system 5, the plasma torch 4, and the plasma torch nozzle 3.
Preferably, the adiabatic expansion mechanism is a piston mechanism. The piston mechanism can slide in a sealing mode, the piston mechanism is similar to a piston process in an internal combustion engine in operation, when the piston mechanism moves outwards in a sealing mode, the pressure in the powder making cavity 11 is reduced, and an adiabatic expansion process is formed, so that gas in the powder making cavity 11 comprises liquid or solid raw material particles and is rapidly cooled, the powder cooling rate is improved, and the characteristic of high-quality powder is obtained. When the piston mechanism moves inwards, on one hand, because the process gas input and the vacuum-pumping working system exist in the powder making process, the adiabatic compression cannot be generated generally, the temperature rise inside the powder making chamber 11 cannot be caused, and on the other hand, the inward movement speed of the adiabatic expansion mechanism can be designed and controlled to be far lower than the outward movement speed, so that the adiabatic compression cannot be generated.
Preferably, the adiabatic expansion mechanism in operation forms a space volume 10% to 100% greater than the space volume of the pulverizing chamber 11.
Preferably, the transmission mechanism 9 of the adiabatic expansion mechanism can realize crankshaft reciprocating motion, vertical pulling motion or pneumatic cylinder pushing motion. Further, all of the mechanisms, power systems, or isolated spaces capable of achieving sealed sliding may be applied to the adiabatic expansion mechanism of the present invention.
Preferably, the working pressure of the pulverizing chamber 11 is controlled between 1/100 atm and 10 atm by the vacuum-pumping system and the gas-conveying system 5.
Preferably, the operating frequency of the plasma torch 4 is between 1 and 100kHz and the operating frequency of the adiabatic expansion mechanism is between 1 and 100kHz, the operating frequencies of the plasma torch 4 and the adiabatic expansion mechanism being capable of forming a coupling. The coupling means that the frequencies of the two are the same or are integer times; when the frequencies are the same, when one party is in a working state, the other party is just in the working state or the non-working state; when the frequency is an integral multiple, the operating state required by the high frequency can be matched to the maximum extent during the operating state of the low frequency side. For example, during ignition of the plasma torch 4, the adiabatic expansion mechanism compresses the volume of the pulverizing chamber 11 to ensure that the thrown liquid drops collide with more gas molecules; during the non-combustion period of the plasma torch 4, the adiabatic expansion mechanism carries out adiabatic expansion, so that the atmosphere of the powder making chamber 11 is rapidly cooled; may be 1: 1 coupling, which can also be n: m is coupled, wherein n and m are natural numbers.
Preferably, the rod-shaped anode 1 has a diameter of between 1mm and 100cm and a rotation speed of between 1 and 100000 rpm.
Preferably, the rod-shaped anode 1 has a diameter of between 1cm and 10 cm.
Preferably, the plasma torch 4 has a power of between 1 and 500kW and operates in a direct current or pulsed discharge.
In order to solve the above problems, the present invention also provides a method for preparing metal powder using the apparatus, the method comprising the steps of: in the powder making process of the powder making chamber 11, under the action of the plasma torch 4, the rod-shaped anode 1 serving as a powder making raw material is melted and evaporated, and under the action of a rotary centrifugal force, the rod-shaped anode 1 leaves in a metal liquid drop form; and cooling and solidifying the metal liquid drops to form powder. In the powder making process, the transmission mechanism 9 drives the adiabatic expansion mechanism to work, and the volume of the adiabatic expansion mechanism is increased. In the process of milling, a plasma torch 4 as a cathode ignites inert process gas to form arc discharge; under the combined action of two driving forces, namely airflow generated by inputting inert process gas and arc discharge voltage, the flame 2 of the plasma torch directly acts on the rod-shaped anode 1; the head of the rod-shaped anode 1 directly opposite to the plasma torch nozzle 3 is gasified and liquefied under the action of the flame 2 of the plasma torch, meanwhile, the rod-shaped anode 1 rotates at a high speed, metal liquid drops are thrown out to form liquid drops, and the gasified raw material molecules and the liquefied thrown-out liquid drops are cooled and solidified under the action of environmental gas to form powder.
Preferably, the method further comprises the steps of: before the milling process, a vacuum pump 13 is used for vacuumizing the milling chamber 11; and stopping vacuumizing the powder making chamber 11 and starting vacuumizing the vacuum chamber 12 in the process that the transmission mechanism 9 drives the adiabatic expansion mechanism to work.
The first embodiment is as follows:
referring to fig. 2, the preparation of metallic titanium powder is taken as an example. The titanium rod is used as a rod-shaped anode 1, the diameter of the titanium rod is 100mm, the length of the titanium rod extending into the powder making chamber 11 is 100mm, and the rotating speed of the titanium rod is adjustable at 0-10 ten thousand revolutions per minute.
The distance between the rod-shaped anode 1 and the torch nozzle 3 is 600mm, i.e. the area of the torch flame 2 emitted by the torch 4 is 600mm wide.
The plasma torch nozzle 3 is made of water-cooled copper, the plasma torch 4 is made of high-temperature material tungsten, the process gas is Ar gas, and the flow rate is adjustable from 0L/min to 10L/min.
The power supply of the plasma torch 4 has a maximum power of 100kW, and is connected to the negatively charged plasma torch 4 as a cathode and the positively charged rod-shaped anode 1 via a power supply line 6. The power supply of the plasma torch 4 adopts a pulse power supply, the pulse frequency is adjustable within 0-40K, and the working width is adjustable within 40% -100%.
8 is a valve plate forming an adiabatic expansion mechanism, 9 is a transmission mechanism driving the valve plate 8 to move, the moving frequency of the transmission mechanism 9 is between 0 and 10 ten thousand times/minute, and when the space volume of the adiabatic expansion mechanism is 0, the position of the valve plate 8 is 10, namely the initial position of the valve plate 8 of the adiabatic expansion mechanism, and is in sealing connection with the wall of the pulverizing chamber 11.
The space volume of the milling chamber 11 is 2 cubic meters, and the maximum space volume of the adiabatic expansion mechanism during working is 1 cubic meter, namely the whole space volume after adiabatic expansion is 1.5 times of the space volume of the original milling chamber 11. According to the above theoretical analysis of adiabatic expansion, it is known that the temperature of the space of the pulverizing chamber 11 instantaneously decreases by about 20% by adiabatic expansion.
The powder process comprises the steps of firstly vacuumizing a powder chamber 11 to 10 degrees after the rod-shaped anode 1, the plasma torch 4, the power supply 7, the adiabatic expansion mechanism and the like are ready-1Pa, then stopping vacuumizing the powder making chamber 11, and starting vacuumizing the adiabatic expansion mechanism; then, starting a gas transmission system 5, wherein the flow rate is 5L/min; the working rotating speed of the rotating rod-shaped anode 1 is 2 ten thousand revolutions per minute; the power supply of the plasma torch 4 has a working power of 50kW, a pulse frequency of 40K, and a power output width of 90%.
The work of adiabatic expansion mechanism is opened, is closed according to the automatic opening of the 11 internal pressure of powder process chamber that detect, and when 11 internal pressure of powder process chamber reached setting value 0.9 atmospheric pressure, adiabatic expansion mechanism work, and powder process chamber 11 space returns voluntarily after increasing to original 1.5 times. Because the pulverizing chamber 11 is in continuous aeration and the adiabatic expansion space is in continuous vacuum pumping, the operation of the adiabatic expansion mechanism is automatically adapted and actively operated under the condition that the pressure of the pulverizing chamber 11 is continuously changed.
In adiabatic expansion, the metal liquid drop is also in the adiabatic expansion process, and the temperature of the metal liquid drop is also reduced due to adiabatic expansion, so that the pulverization speed is further improved, and the pulverization effect is optimized. In the technology for preparing powder by a rotary electrode method, the adiabatic expansion mechanism is added, and based on the adiabatic expansion mechanism, all gas in the powder preparing chamber 11 can be rapidly cooled, so that the rapid solidification of metal liquid drops is facilitated, the liquid drops are reduced to be recombined to form large liquid drops, the possibility that the liquid drops block a plasma torch nozzle 3 is greatly eliminated, and a foundation is provided for the wider application of the rotary electrode powder preparing technology.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (14)
1. An apparatus for preparing metal powder, the apparatus includes a powder making chamber, a powder collecting chamber at the bottom of the powder making chamber, a power supply for providing power for the apparatus for preparing metal powder, a rotary feeding mechanism for rotating and propelling a rod-shaped anode at one side of the powder making chamber, a rod-shaped anode in the rotary feeding mechanism, a gas transmission system, a plasma torch and a plasma torch nozzle which are arranged at the other side of the powder making chamber in sequence, wherein the rotary feeding mechanism, the rod-shaped anode, the gas transmission system, the plasma torch and the plasma torch nozzle are coaxially arranged, and the rod-shaped anode and the plasma torch nozzle are opposite, characterized in that an adiabatic expansion mechanism is mechanically and hermetically connected at the outer side of the powder making chamber, the adiabatic expansion mechanism comprises a transmission mechanism and a powder making valve plate, the transmission mechanism acts on the valve plate for changing the volume of the adiabatic expansion mechanism.
2. The apparatus according to claim 1, further comprising a vacuum pumping system, wherein the vacuum pumping system comprises a vacuum pump, a double control valve and a vacuum chamber, the vacuum pump is connected to the powder preparation chamber through the double control valve, one side of the vacuum chamber is connected to the adiabatic expansion mechanism, and the other side of the vacuum chamber is connected to the vacuum pump through the double control valve, and the vacuum pump is used for controlling the vacuum degree of the powder preparation chamber and the vacuum chamber through the double control valve.
3. The apparatus of claim 1 or 2, wherein a cold water jacket is disposed on the surface of the pulverizing chamber.
4. The apparatus for manufacturing a metal powder according to claim 1 or 2, wherein the adiabatic expansion mechanism is located in a vertical direction of the rotary feeding mechanism, the rod-shaped anode, the gas delivery system, the plasma torch, and the plasma torch nozzle, which are coaxially disposed.
5. An apparatus for producing a metal powder according to claim 1 or 2 wherein the adiabatic expansion mechanism is a piston mechanism.
6. The apparatus according to claim 1 or 2, wherein the adiabatic expansion mechanism in operation forms a space volume 10% to 100% larger than the space volume of the pulverization chamber.
7. The apparatus for preparing metal powder according to claim 1 or 2, wherein the transmission mechanism of the adiabatic expansion mechanism can realize crankshaft reciprocating motion, vertical pulling motion or pneumatic cylinder pushing motion.
8. The apparatus of claim 2, wherein the operating pressure of the pulverization chamber is controlled between 1/100 atm and 10 atm by the vacuum pumping system and the gas transmission system.
9. The apparatus of claim 1 or 2, wherein the plasma torch has an operating frequency of between 1 and 100kHz, the adiabatic expansion mechanism has an operating frequency of between 1 and 100kHz, and the operating frequencies of the plasma torch and the adiabatic expansion mechanism are capable of being coupled.
10. An apparatus for preparing metal powder according to claim 1 or 2, wherein the rod-shaped anode has a diameter of 1mm to 100cm and a rotation speed of 1 to 100000 rpm.
11. An apparatus for producing metal powder according to claim 10 wherein the rod-shaped anode has a diameter of between 1cm and 10 cm.
12. An apparatus for preparing metal powder according to claim 1 or 2, wherein the power of the power supply of the plasma torch is between 1 and 500kW and the operation mode is dc discharge or pulse discharge.
13. A method for preparing metal powder using the apparatus of claim 1, the method comprising the steps of: in the powder making process of the powder making chamber, under the action of a plasma torch, a rod-shaped anode serving as a powder making raw material is melted and evaporated, and under the action of a rotary centrifugal force, the rod-shaped anode leaves the rod-shaped anode in a metal liquid drop form; the powder preparation device is characterized in that in the powder preparation process, the transmission mechanism acts on the valve plate to drive the heat insulation expansion mechanism to work, and the volume of the heat insulation expansion mechanism is increased.
14. The method of making a metal powder of claim 13, further comprising the steps of: before the milling process, vacuumizing the milling cavity by using a vacuum pump; and in the process that the transmission mechanism acts on the valve plate to drive the adiabatic expansion mechanism to work, stopping vacuumizing the powder preparation chamber and starting vacuumizing the vacuum chamber.
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| CN112191857A (en) * | 2020-12-04 | 2021-01-08 | 西安欧中材料科技有限公司 | Method for preparing iron-based powder by using high-energy-density plasma rotating electrode |
| CN116638091A (en) * | 2023-06-02 | 2023-08-25 | 大连理工大学 | A variable-diameter combination device for a plasma evaporation chamber and its realization method |
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| CN116638091A (en) * | 2023-06-02 | 2023-08-25 | 大连理工大学 | A variable-diameter combination device for a plasma evaporation chamber and its realization method |
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