Processing equipment and processing method of spherical molybdenum powder

Abstract

The application relates to the technical field of metal powder manufacturing, and particularly discloses a processing device and a processing method for spherical molybdenum powder. The processing device comprises a powder feeding system, a plasma generating system, a reaction melting chamber and a quenching and collecting system. The complex arch breaking and Venturi homogenizing structure effectively eliminates bridging and pulses, lays a foundation for uniform heating, and reduces the rate of hollow sphere; the magnetic control rotating anode makes the arc root uniformly scan, the self-compensation cathode maintains a constant electrode distance, effectively reduces electrode pollution and improves the long-time stability of plasma; the gradient composite wall combines porous ceramics and a radial air curtain to form a dynamic protective layer, effectively prevents particle adhesion, ensures a long-lasting clean reaction environment, and eliminates wall pollution sources; the laminar gradient cooler constructs a programmable axial temperature field to obtain powder products with uniform structure and consistent performance; and the air cushion guide type cyclone separator inlet uses an air film buffer instead of hard impact to protect the sphericity and surface smoothness of the powder.

Description

Technical Field

[0001] This invention relates to the field of metal powder manufacturing technology, and more specifically, to a processing equipment and method for spherical molybdenum powder. Background Technology

[0002] Spherical molybdenum powder is a key raw material in high-end additive manufacturing and other fields due to its high purity, excellent flowability and bulk density. Its mainstream preparation method is plasma spheroidization technology, which melts irregular molybdenum powder with high-temperature plasma, spheroidizes it under the action of surface tension, and then cools and solidifies it rapidly. Existing molybdenum powder processing equipment is prone to bridging and pulsed powder discharge when feeding ultrafine molybdenum powder. The simple gas-solid mixing structure leads to the powder entering the high-temperature zone in uneven clumps, resulting in uneven heating and the formation of hollow spheres. At the same time, gas-solid stratification during the conveying process further deteriorates the uniformity of powder concentration. In the plasma generator and reaction chamber, localized concentrated ablation of the fixed electrodes not only contaminates the powder but also causes arc and temperature field drift, resulting in poor process stability. Furthermore, the cold wall effect of the water-cooled chamber wall causes unmelted particles to collide and adhere at high speed, forming an easily peelable dust layer that becomes a source of product impurities and interferes with the flow field. Summary of the Invention

[0003] To overcome the above-mentioned technical problems, this invention proposes a processing equipment and method for spherical molybdenum powder.

[0004] The objective of this invention can be achieved through the following technical solutions: A processing device for spherical molybdenum powder, comprising: The powder feeding system includes a comprehensive arch-breaking and homogenizing powder feeding structure; A plasma generating system includes a torch, wherein a magnetically controlled rotating anode mechanism and a self-compensating cathode mechanism are disposed opposite to each other within the torch. The reaction melting chamber has a gradient composite wall structure on its inner wall; The quenching and collection system includes a laminar gradient cooler and an air cushion cyclone separator.

[0005] As a further aspect of the present invention: the integrated arch-breaking and homogenizing powder feeding structure includes an anti-bridging hopper and a Venturi negative pressure homogenizer; The bottom of the anti-bridging hopper has a double-conical structure, and a rotating arch-breaking scraper driven by the first drive motor is installed inside it. The throat of the Venturi negative pressure homogenizer is connected to a carrier gas inlet, and a turbulent premixing pipe with an internal static mixer is connected below the Venturi negative pressure homogenizer.

[0006] As a further aspect of the present invention: the magnetically controlled rotating anode mechanism includes a water-cooled anode nozzle rotatably mounted inside the torch body, a second drive motor for driving the water-cooled anode nozzle to rotate, and an electromagnetic coil surrounding the outside of the torch body for generating an axial magnetic field.

[0007] As a further aspect of the present invention: the self-compensating cathode mechanism includes a tungsten cathode rod, a linear propulsion module for clamping and driving the tungsten cathode rod to move along its axial direction, and an ablation monitoring sensor for monitoring the end position of the tungsten cathode rod.

[0008] As a further aspect of the present invention: the water-cooled anode nozzle is connected to the torch body via a magnetic fluid sealing rotary joint.

[0009] As a further aspect of the present invention: the gradient composite wall structure includes an inverted conical water-cooled wall forming the inner wall of the main body of the reaction melting chamber, a porous ceramic liner attached to the inner surface of the inverted conical water-cooled wall, and a protective gas chamber located between the inverted conical water-cooled wall and the porous ceramic liner, wherein the protective gas chamber is used to permeate into the reaction melting chamber to form a radial gas curtain.

[0010] As a further aspect of the present invention: the laminar gradient cooler includes an inner layer gas pipe, a middle layer cooling gas pipe and an outer layer water-cooling jacket arranged coaxially. The inner layer gas pipe is used to introduce room temperature inert gas, and the middle layer cooling gas pipe is used to introduce low temperature inert gas. The outlet airflow direction of the inner layer gas pipe and the middle layer cooling gas pipe is the same as the particle falling direction.

[0011] As a further aspect of the present invention: the air cushion cyclone separator includes a tangential inlet channel, the inner wall of which is inlaid with a porous material liner, the porous material liner being connected to a low-pressure air chamber for providing air cushion gas, and the porosity of the porous material liner gradually changing along the airflow direction.

[0012] As a further aspect of the present invention, it also includes a total control system, which is signal-connected to the first drive motor, the second drive motor, the electromagnetic coil, the linear propulsion module, and the ablation monitoring sensor, and is used to coordinate and control the uniformity of powder feeding, plasma stability, and electrode position.

[0013] This invention also discloses a processing method for a processing device for spherical molybdenum powder, comprising the following steps: S1: The irregularly shaped raw molybdenum powder is loaded into the integrated arch-breaking and homogenizing powder feeding structure; S2: Start the equipment and, in an inert atmosphere, ignite and maintain a stable plasma through the magnetically controlled rotating anode mechanism and the self-compensating cathode mechanism; S3: Through a comprehensive arch-breaking and homogenizing powder feeding structure, the raw molybdenum powder is transported to the high-temperature plasma zone in a uniform and stable gas-solid two-phase flow form to melt and spheroidize it. S4: Molten molybdenum droplets fall into the reaction melting chamber, and after being protected by the gradient composite wall structure, they enter the laminar gradient cooler for controlled quenching and solidification. S5: The cured spherical molybdenum powder is separated and collected non-destructively by an air cushion cyclone separator.

[0014] The beneficial effects of this invention are: The composite arch-breaking and Venturi homogenization structure effectively eliminates bridging and pulses, achieving millisecond-level stability of powder flow rate, laying the foundation for uniform heating and reducing the hollow sphere ratio; The magnetically controlled rotating anode enables uniform scanning of the arc root, while the self-compensating cathode maintains a constant electrode distance, effectively reducing electrode contamination and improving long-term plasma stability. The gradient composite wall combines porous ceramics with a radial air curtain to form a dynamic protective layer, effectively preventing particle adhesion, ensuring a clean reaction environment, and eliminating sources of wall contamination. The laminar gradient cooler creates a programmable axial temperature field, causing all particles to solidify uniformly according to a set curve, resulting in powder products with uniform structure and consistent properties. The air-cushioned cyclone separator inlet uses air film buffering instead of hard impact to preserve the sphericity and surface smoothness of the powder. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a three-dimensional schematic diagram of a processing device for spherical molybdenum powder according to the present invention; Figure 2 This is a schematic diagram of the powder feeding system in a processing device for spherical molybdenum powder according to the present invention; Figure 3 This is a schematic diagram of the magnetically controlled rotating anode mechanism in a processing device for spherical molybdenum powder according to the present invention; Figure 4 This is a schematic diagram of the self-compensating cathode mechanism in a processing device for spherical molybdenum powder according to the present invention. Figure 5 This is a schematic diagram of the gradient composite wall structure in a processing device for spherical molybdenum powder according to the present invention; Figure 6 This is a schematic diagram of the quenching and collection system in a processing device for spherical molybdenum powder according to the present invention.

[0017] In the picture: 100. Powder feeding system; 110. Anti-bridging hopper; 111. First drive motor; 112. Rotary arch-breaking scraper; 120. Venturi negative pressure homogenizer; 121. Static mixer; 122. Turbulent premixing pipe; 200. Plasma generation system; 210. Torch body; 221. Water-cooled anode nozzle; 222. Second drive motor; 223. Electromagnetic coil; 224. Magnetohydrodynamic sealed rotary joint; 231. Tungsten cathode rod; 232. Linear propulsion module; 233. Ablation monitoring sensor; 300. Reaction melting chamber; 310. Inverted conical water-cooled wall; 320. Porous ceramic liner; 330. Protective gas chamber; 400. Quenching and collecting system; 410. Laminar flow gradient cooler; 411. Inner layer air pipe; 412. Middle layer cooling air pipe; 413. Outer layer water cooling jacket; 420. Air cushion guide cyclone separator; 421. Tangential inlet channel; 422. Porous material liner; 423. Low-pressure air chamber; 500. Overall control system. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] Please see Figure 1 The present invention provides a processing equipment for spherical molybdenum powder, comprising a powder feeding system 100, a plasma generating system 200, a reaction melting chamber 300, a quenching and collecting system 400, and a total control system 500; the powder feeding system 100 includes a comprehensive arch-breaking and homogenizing powder feeding structure; the plasma generating system 200 includes a torch 210, wherein a magnetically controlled rotating anode mechanism and a self-compensating cathode mechanism are arranged oppositely within the torch 210; the inner wall of the reaction melting chamber 300 is provided with a gradient composite wall structure; the quenching and collecting system 400 includes a laminar flow gradient cooler 410 and an air cushion guiding cyclone separator 420.

[0020] Specifically, the powder feeding system 100 ensures exceptionally stable powder supply from the source; the plasma generation system 200 creates a pure high-temperature heat source with constant spatiotemporal characteristics; the reaction melting chamber 300 provides an inert reaction space that is actively anti-contamination and self-cleaning; and the quenching and collection system 400 achieves precise shaping of the product's microstructure and macroscopic morphology. This invention overcomes the shortcomings of traditional equipment where each link operates independently, achieving decoupling and precise control of process parameters, and providing a reliable equipment foundation for preparing spherical molybdenum powder with ultra-high purity, ultra-narrow particle size distribution, and ultra-high sphericity.

[0021] In one embodiment, please refer to Figure 2 The integrated anti-bridging homogenizing and powder feeding structure includes an anti-bridging hopper 110 and a Venturi negative pressure homogenizer 120; the bottom of the anti-bridging hopper 110 is a double-conical structure, and a rotating anti-bridging scraper 112 driven by a first drive motor 111 is installed inside; the throat of the Venturi negative pressure homogenizer 120 is connected to a carrier gas inlet, and a turbulent premixing pipe 122 with a static mixer 121 inside is connected below the Venturi negative pressure homogenizer 120.

[0022] Specifically, the double-conical structure at the bottom of the anti-bridging silo 110, together with the rotating arch-breaking scraper 112, constitutes a dynamically activated micro powder storage unit. The speed-regulating first drive motor 111 can flexibly adjust the rotation speed of the rotating arch-breaking scraper 112 according to the physical characteristics such as the angle of repose and humidity of different batches of raw material molybdenum powder. More importantly, by setting the gap between the scraper blade and the silo wall, different arch-breaking modes from tight scraping to gentle disturbance can be achieved, which is suitable for a wide range of raw materials from ultrafine powder to conventional particle size powder, and has extremely strong versatility. The Venturi negative pressure homogenizer 120 uses Bernoulli's principle to change the powder conveying method from traditional mechanical forced pushing to pneumatic flexible ejection based on pressure difference, thereby achieving pulse-free continuous conveying. The subsequent turbulent premixing pipe 122, through the built-in static mixer 121, forcibly divides, recombines and mixes the gas-solid two-phase flow, and completes the secondary dispersion and uniform distribution of powder at the pipe scale. It should be noted that the above structure integrates mechanical arch breaking, pneumatic conveying and static mixing technology, which not only solves the bridging problem of ultrafine molybdenum powder, but also achieves high-precision constant powder mass flow rate on the millisecond time scale. This is the fundamental prerequisite for obtaining uniform thermal history and consistent spheroidization effect, which greatly reduces the proportion of non-spherical particles in the product.

[0023] Further, please refer to Figure 3The magnetically controlled rotating anode mechanism includes a water-cooled anode nozzle 221 rotatably mounted inside the torch body 210, a second drive motor 222 that drives the water-cooled anode nozzle 221 to rotate, and an electromagnetic coil 223 surrounding the outside of the torch body 210 for generating an axial magnetic field; the water-cooled anode nozzle 221 is connected to the torch body 210 via a magnetohydrodynamic sealed rotary joint 224. Please see Figure 4 The self-compensating cathode mechanism includes a tungsten cathode rod 231, a linear propulsion module 232 for clamping and driving the tungsten cathode rod 231 to move along its axial direction, and an ablation monitoring sensor 233 for monitoring the end position of the tungsten cathode rod 231.

[0024] Specifically, in the magnetically controlled rotating anode mechanism, the water-cooled anode nozzle 221 achieves high-speed rotation under dynamic sealing through the magnetohydrodynamic sealing rotary joint 224; simultaneously, the controllable axial magnetic field generated by the electromagnetic coil 223 interacts with the arc current, and the resulting magnetohydrodynamic effect strongly constrains and drives the arc root, causing it to scan the inner wall surface of the rotating anode at a set frequency and path, thereby dispersing the energy input point and ablation point from a fixed position to a continuously moving ring surface; in the self-compensating cathode mechanism, the linear propulsion module 232, composed of a servo motor and a ball screw, forms a closed-loop control system for the cathode length under the real-time feedback of the ablation monitoring sensor 233 (such as a high-precision laser rangefinder), which can achieve micron-level positioning and compensation.

[0025] It should be noted that the dynamic scanning arc in this scheme realizes the transformation of anode ablation from point erosion to surface wear, effectively extending the anode life and significantly reducing the generation rate of electrode metal contaminants during operation; combined with real-time cathode compensation, the entire system can maintain stable core parameters such as temperature, length and rigidity of plasma flame during continuous operation for tens of hours.

[0026] In yet another embodiment, please refer to Figure 5 The gradient composite wall structure includes an inverted conical water-cooled wall 310 forming the inner wall of the main body of the reaction melting chamber 300, a porous ceramic liner 320 attached to the inner surface of the inverted conical water-cooled wall 310, and a protective gas chamber 330 located between the inverted conical water-cooled wall 310 and the porous ceramic liner 320. The protective gas chamber 330 is used to penetrate into the reaction melting chamber 300 to form a radial gas curtain.

[0027] Specifically, the structure of the inverted conical water-cooled wall 310 in the reaction melting chamber 300 imparts a downward velocity component along the wall surface to the unmelted particles, which kinematically reduces their normal impact energy and retention tendency. The detachable porous ceramic liner 320, as a functional layer in direct contact with the high-temperature environment, has porous characteristics that allow the inert gas introduced into the protective gas chamber 330 to pass through these micropores uniformly, forming a complete and continuous microporous outflow gas film on the hot surface of the liner, thereby constituting a dynamic barrier that isolates high-temperature particles from the cold wall.

[0028] It is worth noting that when most particles approach the wall, they first interact with this stagnant gas film, their momentum is absorbed and their direction is changed, thus effectively avoiding hard collisions and adhesion with the solid wall. Even if a very small amount of fine powder is deposited under extreme conditions, it is limited to the surface of the quickly replaceable porous ceramic liner 320, achieving a balance between ease of maintenance and chamber cleanliness. This ensures that the thermodynamic boundary conditions of the reaction chamber remain constant and effectively eliminates process drift caused by changes in the wall state.

[0029] Further, please refer to Figure 6 The laminar gradient cooler 410 includes an inner air pipe 411, a middle cooling air pipe 412 and an outer water-cooling jacket 413 arranged coaxially. The inner air pipe 411 is used to introduce room temperature inert gas, and the middle cooling air pipe 412 is used to introduce low temperature inert gas. The outlet airflow direction of the inner air pipe 411 and the middle cooling air pipe 412 is the same as the particle falling direction. The air cushion cyclone separator 420 includes a tangential inlet channel 421, the inner wall of which is inlaid with a porous material liner 422. The porous material liner 422 is connected to a low-pressure air chamber 423 for providing air cushion gas. The porosity of the porous material liner 422 gradually changes along the airflow direction.

[0030] Specifically, the coaxial multi-layer structure of the laminar gradient cooler 410 constructs a programmable axial temperature field. By independently adjusting the flow rate and temperature of the inner layer gas pipe 411 (room temperature gas) and the middle layer cooling gas pipe 412 (deep cooling gas), the temperature at any point on the spatial axis between the bottom of the reaction chamber and the separator inlet can be precisely set, thereby customizing the optimal cooling path for droplets of different particle sizes and achieving fine control of the solidification structure. The porous material liner 422 (such as gradient sintered metal) embedded in the inner wall of the tangential inlet channel 421 has a porosity designed as a gradual structure along the airflow direction (from the outside to the inside of the inlet). The gas introduced into the low-pressure gas chamber 423 passes through the liner to form a stable gas cushion tightly attached to the wall.

[0031] It should be noted that laminar gradient cooling ensures that all particles experience the same cooling effect, resulting in uniform and fine equiaxed crystals. This effectively improves the compressibility and sintering activity of the powder, with minimal performance differences between batches. The air cushion inlet replaces solid-solid hard collisions with gas-solid soft contact. Before contacting the solid wall, the high-speed moving spherical particles exchange energy with the air cushion, reducing their speed and guiding their direction. This almost completely eliminates surface defects (such as scratches and pits) and lattice distortions caused by mechanical impacts, thereby significantly improving the sphericity and surface smoothness of the product, and further enhancing its flowability and packing density during the additive manufacturing powder spreading process.

[0032] Furthermore, please refer to Figure 1 It also includes a total control system 500, which is signal connected to the first drive motor 111, the second drive motor 222, the electromagnetic coil 223, the linear propulsion module 232, and the ablation monitoring sensor 233, and is used to coordinate and control the uniformity of powder feeding, plasma stability and electrode position.

[0033] Specifically, the overall control system 500, as the brain of the equipment, realizes intelligent linkage between various innovative subsystems. It receives signals from the ablation monitoring sensor 233, various flow meters, and pressure sensors, and coordinates and controls the speed of the first drive motor 111 (adjusting the powder feeding amount), the speed of the second drive motor 222 and the current of the electromagnetic coil 223 (regulating the arc scanning), and the action of the linear propulsion module 232 (compensating the cathode), etc. When the system detects slight fluctuations in the powder feeding rate due to changes in raw materials, it can fine-tune the plasma power to compensate. When electrode ablation is detected, the compensation mechanism is automatically activated, which not only greatly reduces the difficulty of operation and the dependence on personnel experience, but also ensures the adaptive and stable production of the equipment.

[0034] The present invention also provides a processing method for a processing device for spherical molybdenum powder, comprising the following steps: S1: The irregularly shaped raw molybdenum powder is loaded into the integrated arch-breaking and homogenizing powder feeding structure; S2: Start the equipment and, in an inert atmosphere, ignite and maintain a stable plasma through the magnetically controlled rotating anode mechanism and the self-compensating cathode mechanism; S3: Through a comprehensive arch-breaking and homogenizing powder feeding structure, the raw molybdenum powder is transported to the high-temperature plasma zone in a uniform and stable gas-solid two-phase flow form to melt and spheroidize it. S4: Molten molybdenum droplets fall into the reaction melting chamber 300, and after being protected by the gradient composite wall structure, they enter the laminar gradient cooler 410 for controlled quenching and solidification. S5: The cured spherical molybdenum powder is separated and collected non-destructively by the air cushion cyclone separator 420.

[0035] It should be noted that the magnetically controlled rotation and self-compensation mechanism initiated in step S2 ensures that the heat source is in an optimal stable state from the beginning; the application of the integrated arch-breaking and homogenizing powder feeding structure in step S3 is a key operation to obtain uniform powder; in step S4, the particles are successively protected by the air curtain of the gradient composite wall and programmed cooling by the laminar gradient cooler 410, undergoing a controlled physical process from melting, flying to solidification; the air cushion guiding separation in step S5 is the last guarantee to ensure the perfect morphology of the final product.

[0036] The specific embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. A processing device for spherical molybdenum powder, characterized in that, include: The powder feeding system (100) includes a comprehensive arch-breaking and homogenizing powder feeding structure; A plasma generating system (200) includes a torch (210) in which a magnetically controlled rotating anode mechanism and a self-compensating cathode mechanism are disposed opposite to each other; The reaction melting chamber (300) has a gradient composite wall structure on its inner wall; The quenching and collection system (400) includes a laminar gradient cooler (410) and an air cushion cyclone separator (420).

2. The processing equipment for spherical molybdenum powder according to claim 1, characterized in that, The integrated arch-breaking and homogenizing powder feeding structure includes an anti-bridging hopper (110) and a Venturi negative pressure homogenizer (120). The bottom of the anti-bridging hopper (110) is a double-conical structure, and a rotating arch-breaking scraper (112) driven by the first drive motor (111) is installed inside. The throat of the Venturi negative pressure homogenizer (120) is connected to a carrier gas inlet, and a turbulent premixing pipe (122) with a static mixer (121) inside is connected below the Venturi negative pressure homogenizer (120).

3. The processing equipment for spherical molybdenum powder according to claim 2, characterized in that, The magnetically controlled rotating anode mechanism includes a water-cooled anode nozzle (221) rotatably mounted in the torch body (210), a second drive motor (222) that drives the water-cooled anode nozzle (221) to rotate, and an electromagnetic coil (223) surrounding the outside of the torch body (210) for generating an axial magnetic field.

4. The processing equipment for spherical molybdenum powder according to claim 3, characterized in that, The self-compensating cathode mechanism includes a tungsten cathode rod (231), a linear propulsion module (232) for clamping and driving the tungsten cathode rod (231) to move along its axial direction, and an ablation monitoring sensor (233) for monitoring the end position of the tungsten cathode rod (231).

5. The processing equipment for spherical molybdenum powder according to claim 3, characterized in that, The water-cooled anode nozzle (221) is connected to the torch body (210) via a magnetic fluid sealed rotary joint (224).

6. The processing equipment for spherical molybdenum powder according to claim 1, characterized in that, The gradient composite wall structure includes an inverted conical water-cooled wall (310) forming the inner wall of the main body of the reaction melting chamber (300), a porous ceramic liner (320) attached to the inner surface of the inverted conical water-cooled wall (310), and a protective gas chamber (330) located between the inverted conical water-cooled wall (310) and the porous ceramic liner (320). The protective gas chamber (330) is used to penetrate into the reaction melting chamber (300) to form a radial gas curtain.

7. The processing equipment for spherical molybdenum powder according to claim 1, characterized in that, The laminar gradient cooler (410) includes an inner layer gas pipe (411), a middle layer cooling gas pipe (412), and an outer layer water-cooling jacket (413) arranged coaxially. The inner layer gas pipe (411) is used to introduce room temperature inert gas, and the middle layer cooling gas pipe (412) is used to introduce low temperature inert gas. The outlet airflow direction of the inner layer gas pipe (411) and the middle layer cooling gas pipe (412) is the same as the direction of particle falling.

8. The processing equipment for spherical molybdenum powder according to claim 7, characterized in that, The air cushion cyclone separator (420) includes a tangential inlet channel (421), the inner wall of which is inlaid with a porous material liner (422), the porous material liner (422) is connected to a low-pressure air chamber (423) for providing air cushion gas, and the porosity of the porous material liner (422) gradually changes along the airflow direction.

9. The processing equipment for spherical molybdenum powder according to claim 4, characterized in that, It also includes a general control system (500), which is connected to the first drive motor (111), the second drive motor (222), the electromagnetic coil (223), the linear propulsion module (232), and the ablation monitoring sensor (233) for coordinating and controlling the uniformity of powder feeding, plasma stability, and electrode position.

10. A processing method for spherical molybdenum powder using a processing apparatus as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: The irregularly shaped raw molybdenum powder is loaded into the integrated arch-breaking and homogenizing powder feeding structure; S2: Start the equipment and, in an inert atmosphere, ignite and maintain a stable plasma through the magnetically controlled rotating anode mechanism and the self-compensating cathode mechanism; S3: Through a comprehensive arch-breaking and homogenizing powder feeding structure, the raw molybdenum powder is transported to the high-temperature plasma zone in a uniform and stable gas-solid two-phase flow form to melt and spheroidize it. S4: Molten molybdenum droplets fall into the reaction melting chamber (300), and after being protected by the gradient composite wall structure, they enter the laminar gradient cooler (410) for controlled quenching and solidification; S5: The cured spherical molybdenum powder is separated and collected non-destructively by an air cushion cyclone separator (420).

Images