A metal strip based plasma atomization powder production device

Abstract

The utility model relates to a kind of plasma atomization powder preparation devices based on metal strip, including atomization chamber, feeding system, plasma system and vacuum chamber, feeding system is set in vacuum chamber, including conveying mechanism, rectification mechanism and guide mechanism, the conveying mechanism is used to deliver metal strip into atomization chamber, and metal strip passes through rectification mechanism and guide mechanism;The rectification mechanism can detect and adjust the position of metal strip in width direction, the guide mechanism can guide the delivery of metal strip, and make metal strip stretch in width direction;The plasma system includes the plasma torch being set in atomization chamber, the injection port of the plasma torch is towards the side of metal strip being fed into atomization chamber by feeding system, the plasma jet of the plasma torch injection has the width L of stretch direction in metal strip width direction, or the injection port of plasma torch can reciprocate in metal strip width direction.

Description

Technical Field

[0001] This utility model relates to the field of metal powder preparation technology, specifically to a plasma atomization powder preparation device based on metal strip. Background Technology

[0002] Plasma atomization is a key technology for preparing high-performance spherical metal powders, especially for additive manufacturing and hot isostatic pressing of titanium alloys and nickel-based superalloys. Its basic principle involves continuously feeding a metal wire into a high-temperature plasma jet formed by one or more plasma torches. The wire tip is instantly melted into droplets, which are then spherically shaped and cooled under the impact force and surface tension of the plasma jet to form spherical powder. Traditional PA technology heavily relies on metal wires as raw materials, leading to the following significant drawbacks: 1. High raw material costs: Drawing metals, especially highly reactive titanium, zirconium or their alloys, and high-melting-point tungsten and molybdenum, into wires with precise diameters and lengths of several kilometers is a complex process with high energy consumption and extremely high costs; 2. Significant material limitations: Many high-performance alloys have high strength but poor plasticity, making them difficult or impossible to draw into wires, greatly limiting the application range of PA technology; 3. Production efficiency bottleneck: The limited feeding speed of a single wire restricts further increases in powder production.

[0003] To address the aforementioned issues, the use of strip-shaped raw materials was considered, but this approach faces significant technical challenges: 1. Feeding stability: Thin strips are prone to deviation and vibration during high-speed feeding, leading to unstable melting points; 2. Uneven melting: Traditional point-like plasma torches struggle to uniformly cover the entire width of the strip, easily resulting in insufficient melting at the strip edges, producing "slag" or irregular particles, which severely impacts powder quality. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a plasma atomization powder preparation device based on metal strip, which can efficiently and stably prepare high-quality spherical powder using metal strip.

[0005] To achieve the above objectives, this utility model provides a plasma atomization powder-making device based on metal strip, including an atomization chamber, a feeding system, a plasma system, and a vacuum chamber. The feeding system is disposed in the vacuum chamber and includes a conveying mechanism, a correction mechanism, and a guiding mechanism. The conveying mechanism is used to convey the metal strip into the atomization chamber, and the metal strip passes through the correction mechanism and the guiding mechanism. The correction mechanism can detect and adjust the position of the metal strip in the width direction, and the guiding mechanism can guide the conveying of the metal strip and make the metal strip extend in the width direction. The plasma system includes a plasma torch disposed in the atomization chamber. The nozzle of the plasma torch faces the side of the metal strip fed into the atomization chamber by the feeding system. The plasma jet ejected by the plasma torch has a spanwise width L in the width direction of the metal strip, or the nozzle of the plasma torch can reciprocate in the width direction of the metal strip.

[0006] Furthermore, the conveying mechanism includes an unwinding roller and several drive roller groups, wherein the metal strip passes between two rolling rollers of the drive roller group and is in close contact with the two rolling rollers.

[0007] Furthermore, the correction mechanism and the guiding mechanism are located on the upstream side of the drive roller group along the conveying direction of the metal strip.

[0008] Furthermore, the correction mechanism includes a correction roller group and a correction moving component. The metal strip passes between the two rolling rollers of the correction roller group and is in close contact with the two rolling rollers. The correction moving component drives the rolling rollers of the correction roller group to move axially.

[0009] Furthermore, the guiding mechanism includes multiple guide roller groups, and the metal strip passes sequentially between two rolling rollers of each guide roller group and is in close contact with the two rolling rollers.

[0010] Furthermore, it also includes a preheating system capable of preheating the metal strip in the vacuum chamber.

[0011] Furthermore, the preheating system includes a power source and two heating electrodes that are in contact with the metal strip, the two heating electrodes being connected to the positive and negative terminals of the power source, respectively.

[0012] Furthermore, the feeding system includes multiple rolling rollers that contact the metal strip, wherein two rolling rollers that are spaced apart along the length of the metal strip are made of metal and constitute heating electrodes.

[0013] Furthermore, the plasma system includes a scanning drive mechanism, which is connected to the plasma torch and drives the plasma torch to move, causing the nozzle of the plasma torch to reciprocate in the width direction of the metal strip.

[0014] Furthermore, the plasma torches are configured as multiple and arranged along the width direction of the metal strip, and the total width of the plasma jets ejected by each plasma torch in the width direction of the metal strip is L; or the width of the plasma jet ejected by a single plasma torch in the width direction of the metal strip is L.

[0015] As described above, the plasma atomizing powder-making device of this utility model has the following beneficial effects:

[0016] 1. Through the feeding system and uniform surface melting technology, efficient atomization of metal strip can be achieved, effectively avoiding problems such as unstable strip feeding and uneven melting. The produced powder has high sphericity, narrow particle size distribution, and almost no satellite balls or irregular particles.

[0017] 2. It can significantly reduce costs. Since the rolling cost of metal strip is much lower than the drawing cost of wire, the preparation cost of high-performance spherical powder is greatly reduced. It can effectively improve production efficiency. The cross-sectional area of ​​metal strip can be designed to be larger, allowing for a higher feed rate per unit time, thereby increasing powder yield.

[0018] 3. It can broaden the range of materials for metal powder preparation, and almost all rollable metals and alloys can be used as raw materials, including those materials that cannot be drawn into wires, which greatly expands the applicability of the technology.

[0019] 4. The process is highly controllable, and its stability and repeatability can be ensured through an integrated monitoring and control system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the plasma atomization powder making device of this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the plasma atomization powder making device of this utility model.

[0022] Explanation of icon numbers

[0023] 1-Unwinding roll; 2-Metal strip; 3-Guide roll group; 4-Drive roll group; 5-Correction mechanism; 51-Correction roll group; 6-Vacuum chamber; 7-Scanning drive mechanism; 8-Plasma torch; 9-Plasma jet; 10-Atomization chamber. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0025] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0026] See Figure 1 and Figure 2 This invention provides a plasma atomization powder-making device based on a metal strip 2, including an atomization chamber 10, a feeding system, a plasma system, and a vacuum chamber 6. The feeding system is disposed in the vacuum chamber 6 and includes a conveying mechanism, a correction mechanism 5, and a guiding mechanism. The conveying mechanism is used to convey the metal strip 2 into the atomization chamber 10, and the metal strip 2 passes through the correction mechanism 5 and the guiding mechanism. The correction mechanism 5 can detect and adjust the position of the metal strip 2 in the width direction, and the guiding mechanism can guide the conveying of the metal strip 2 and make the metal strip 2 extend in the width direction. The plasma system includes a plasma torch 8 disposed in the atomization chamber 10. The nozzle of the plasma torch 8 faces the side of the metal strip 2 fed into the atomization chamber 10 by the feeding system. The plasma jet 9 ejected by the plasma torch 8 has a spanwise width L in the width direction of the metal strip 2, wherein the size of L is determined by the width of the metal strip 2, and is generally slightly larger than the width of the metal strip 2, or the nozzle of the plasma torch 8 can reciprocate in the width direction of the metal strip 2.

[0027] The main working principle of the plasma atomization powder making device involved in this utility model is as follows: the feeding system transports the metal strip 2 to the vacuum chamber 6 for heating, melting and atomization. The conveying mechanism provides the driving force to continuously transport the metal strip 2 to the atomization chamber 10. During the conveying process, the correction mechanism 5 detects the position of the metal strip 2 in the width direction in real time. When the deviation from the preset position is too large, that is, when deviation or shaking occurs during the conveying process, the correction mechanism 5 adjusts the position in time to bring it within the required range. At the same time, the metal strip 2 may be bent during the conveying process. The guiding mechanism guides the conveying path of the metal strip 2 to keep it stretched and flat in the width direction. After the metal strip 2 is conveyed into the atomization chamber 10, it is heated by the plasma jet 9 ejected by the plasma torch 8. The plasma torch 8 can operate in two ways: First, the plasma torch 8 remains stationary, and one or more plasma torches eject plasma jets 9 with a spanwise width L along the width direction of the metal strip 2, creating a flat plasma jet 9 with a width adapted to the metal strip 2, thus uniformly heating all parts of the metal strip 2. Second, the plasma torch 8 can also use an oscillating or translating motion, allowing the nozzle of the plasma torch 8 to reciprocate along the width direction of the metal strip 2, i.e., scanning. This allows the plasma jet 9 to sweep across the entire width of the metal strip 2 like a "hot blade." The scanning speed is linked to the conveying speed of the metal strip 2 to ensure uniform heating and atomization across the entire width of the metal strip 2. The metal strip 2 is melted into a continuous liquid film or droplet flow under the action of the plasma jet 9. Then, the molten metal is broken and atomized into fine droplets under the inherent impact force of the plasma jet 9 and the possible additional auxiliary inert gas flow. The droplets fly, cool, and spheroidize in the atomization chamber 10, eventually forming spherical metal powder.

[0028] The plasma atomization powder making device of this utility model ensures that the metal strip 2 is fed into the action area of ​​the plasma torch 8 at a specified speed, without shaking and with precise centering through the feeding system. The plasma system achieves uniform melting of the metal strip 2, which allows the width and cross-sectional area of ​​the metal strip 2 to be designed to be larger, allowing for a higher feed rate per unit time, thereby improving powder yield, increasing generation efficiency, and ensuring atomization effect.

[0029] See Figure 1 and Figure 2 The present invention will be further described below with reference to specific embodiments:

[0030] Example 1:

[0031] See Figure 1In this embodiment, as a preferred design, the conveying mechanism includes several drive roller groups 4. Each drive roller group 4 consists of two opposing and parallel rolling rollers with a roller spacing slightly smaller than the thickness of the metal strip 2. The metal strip 2 passes between the two rolling rollers of the drive roller group 4 and is in close contact with them. The rotation of the two rolling rollers of the drive roller group 4 drives the metal strip 2 to move. Furthermore, the conveying mechanism also includes a unwinding roller 1, on which a coiled metal strip 2 is mounted. After the metal strip 2 extends, it passes through the drive roller group 4. During the conveying process, the unwinding roller 1 is pulled to rotate, gradually releasing the metal strip 2. As a preferred design, the conveying mechanism has a drive roller group 4 located near the connection between the vacuum chamber 6 and the atomization chamber 10 to better convey the metal strip 2 into the atomization chamber 10. The drive roller group 4 is preferably made of precision metal rollers and has a coating of the same material as the metal strip 2 on its surface to prevent other metals from contaminating the metal strip 2.

[0032] See Figure 1 In this embodiment, as a preferred design, the correction mechanism 5 is located upstream of the drive roller group 4 along the conveying direction of the metal strip 2, meaning the metal strip 2 passes through the correction mechanism 5 before passing through the drive roller group 4. Further, the correction mechanism 5 includes a correction roller group 51 and a correction moving assembly (not shown in the figures). The correction roller group 51 consists of two opposing and parallel rolling rollers with a roller spacing slightly smaller than the thickness of the metal strip 2. The metal strip 2 passes between the two rolling rollers of the correction roller group 51 and maintains close contact with them, keeping a certain contact pressure. The rolling rollers of the correction roller group 51 can rotate freely, and the metal strip 2 drives the correction roller group 51 to rotate during conveying without affecting the conveying process. The correction moving assembly drives the rolling rollers of the correction roller group 51 to move axially, thereby moving the metal strip 2 in the width direction to achieve position adjustment and ensure that the alignment accuracy of the metal strip 2 is within ±0.2 mm. The correction roller group 51 can be configured as one or more pairs according to actual needs. The alignment roller assembly 51 is preferably made of precision metal rollers and has a coating on its surface made of the same material as the metal strip 2 to avoid contamination of the metal strip 2 by other metals.

[0033] In this embodiment, the correction mechanism 5 is equipped with a corresponding correction detection component to detect the position of the metal strip 2 in the width direction. The correction detection component can be a position sensor, specifically a contact sensor or an infrared sensor, to detect the positions of the two side edges of the metal strip 2. The correction detection component can also detect the position of the metal strip 2 in the width direction through visual inspection. In other embodiments, the correction detection component can also adopt an existing suitable structural design that can achieve the above-mentioned corresponding functions.

[0034] See Figure 1In this embodiment, as a preferred design, the guiding mechanism includes guide roller groups 3 and correction roller groups 51, which consist of two opposing and parallel rolling rollers with a roller spacing slightly smaller than the thickness of the metal strip 2. The metal strip 2 passes sequentially between the two rolling rollers of each guide roller group 3 and is in close contact with the two rolling rollers, maintaining a certain contact pressure. The guide roller groups 3 do not rotate actively; the metal strip 2 drives the guide roller groups 3 to rotate during conveying, without affecting the conveying process. Multiple pairs of rolling roller groups stably guide the conveying path of the metal strip 2 and apply rolling pressure to straighten the metal strip 2, preventing bending or folding in the width direction, thus ensuring the metal strip 2 remains in an extended state. The number of guide roller groups 3 can be set to multiple pairs according to actual needs, and all are located upstream of the drive roller group 4 along the conveying direction of the metal strip 2. Specifically, in this embodiment, there are 3 pairs of guide roller groups 3, with 2 pairs located between the correction mechanism 5 and the drive roller group 4, and the other pair located between the unwinding roller 1 and the correction mechanism 5. The guide roller assembly 3 is preferably made of precision metal rollers and has a coating on its surface made of the same material as the metal strip 2 to avoid contamination of the metal strip 2 by other metals.

[0035] See Figure 1 In this embodiment, as a preferred design, the drive roller group 4, the correction roller group 51 and the guide roller group 3 in the feeding system are all arranged in the vertical direction, so that the metal strip 2 is conveyed into the atomization chamber 10 in the vertical direction.

[0036] See Figure 1 In this embodiment, as a preferred design, a preheating system is also included, which can preheat the metal strip 2 in the vacuum chamber 6. The preheating system adopts an electric heating method and includes a power supply and two heating electrodes in contact with the metal strip 2. Preferably, two rolling rollers with an appropriate distance along the length of the metal strip 2 in the feeding system are selected as the two heating electrodes. See [link to relevant documentation]. Figure 1 Specifically, one rolling roller from the drive roller group 4 near the atomizing chamber 10 and another from the drive roller group 4 near the guide roller group 3 are selected as two heating electrodes. These heating electrodes are connected to both ends of a power supply, and the metal strip 2 between the two heating electrodes has a relatively long length. Thus, when energized, current flows through the metal strip 2 between the two heating electrodes, thereby preheating the metal strip 2 between the two rolling rollers serving as heating electrodes. The structure is simple, and the heating is controllable. In other embodiments, the heating electrodes can also be set separately and kept in contact with the metal strip 2; other existing suitable heating methods can also be used in the preheating system.

[0037] See Figure 1In this embodiment, the plasma torch 8 in the plasma system adopts a motion scanning working mode. As a preferred design, the plasma system includes a scanning drive mechanism 7, which can specifically be a linear motor module connected to the plasma torch 8 and drive the plasma torch 8 to move linearly, causing the nozzle of the plasma torch 8 to reciprocate in the width direction of the metal strip 2, with a scanning amplitude slightly larger than the width of the metal strip 2. In addition, the scanning drive mechanism 7 can also drive the plasma torch 8 to perform oscillating scanning in a rotating manner, which can also cause the nozzle of the plasma torch 8 to reciprocate in the width direction of the metal strip 2.

[0038] See Figure 1 In this embodiment, as a preferred design, a swingable plasma torch 8 is provided on both sides of the metal strip 2 entering the atomization chamber 10, and the plasma jets 9 ejected from the plasma torches 8 on both sides heat the two sides of the metal strip 2 respectively.

[0039] See Figure 1 In this embodiment, as a preferred design, a monitoring system is also included. The monitoring system includes a high-speed CCD camera and a dual-color infrared pyrometer (not shown in the figures) mounted obliquely above the melting zone of the metal strip 2 to observe the melting state and monitor the melting point temperature in real time. Preferably, a control system is also provided, which adopts a PLC integrated motion control card to receive feedback signals from the monitoring system and components such as correction sensors and encoders in the conveying system, and to comprehensively control the feeding speed of the drive roller group 4, the power of the plasma torch 8, and the scanning speed of the pendulum scanning drive mechanism 7, among other operating parameters.

[0040] See Figure 1 In this embodiment, as a preferred design, the vacuum chamber 6 is made of stainless steel and equipped with a molecular pump unit, which can evacuate the chamber to a vacuum level of 5.0 × 10⁻³ Pa. During operation, high-purity argon gas with a purity ≥99.999% can be introduced as the working atmosphere, and the chamber pressure can be maintained at a slightly positive pressure of 200 mbar (absolute pressure) to prevent air leakage. The lower part of the atomization chamber 10 is conical and connected to a powder collection container with a vacuum valve.

[0041] Example 2:

[0042] See Figure 2Compared to Embodiment 1, this embodiment employs a different plasma system. Specifically, the plasma torches 8 are fixedly installed instead of moving. Plasma torches 8 are positioned on both sides of the metal strip 2 entering the atomization chamber 10, with three plasma torches 8 on each side. The three plasma torches 8 are arranged along the width direction of the metal strip 2. The total width of the plasma jets 9 emitted by the three plasma torches 8 on one side is L, meaning the spanwise width L of the plasma jets 9 is composed of the plasma jets 9 emitted by the three plasma torches 8. Preferably, the spanwise width L is slightly larger than the width of the metal strip 2, thus ensuring complete and uniform heating of all areas along the corresponding side of the metal strip 2. Alternatively, only one plasma torch 8 can be positioned on each side of the metal strip 2, with a narrow, elongated nozzle. The width of the plasma jet 9 emitted by the plasma torch 8 in the width direction of the metal strip 2 is L. Other parts of this embodiment are the same as in Embodiment 1 and will not be described in detail.

[0043] The powder-making process using the plasma atomization powder-making device of this utility model includes:

[0044] (1) System preparation: Install the rolled metal strip 2 on the unwinding roller 1. The front end of the metal strip 2 passes through the guide roller group 3, the correction mechanism 5, the guide roller group 3 and the drive roller group 4 in sequence, and extends it to the initial position (located at a suitable position below the plasma torch 8); close the vacuum chamber 6 and evacuate it, and then fill it with high-purity inert gas to the working pressure.

[0045] (2) Start-up and feeding: Start the plasma torch 8. After it reaches a stable state, start the feeding system to feed the metal strip 2 into the melting zone at a set speed. At the same time, turn on the preheating system.

[0046] (3) Uniform melting: Under the precise push of the drive roller group 4, the metal strip 2 enters the action area of ​​the scanning plasma jet 9 of the plasma torch 8 at a uniform speed. The scanning function of the plasma torch 8 is activated simultaneously (or ensure that multiple plasma torches 8 / single plasma torch 8 with narrow nozzles are working), so that the high-temperature plasma jet 9 acts uniformly on the entire width of the metal strip 2, instantly melting it into a continuous liquid film or droplet flow. The operator can confirm that the melting process is stable through the observation window and the high-speed camera screen, and that there is no unmelted "serration" phenomenon at the edge of the strip.

[0047] (4) Atomization and Formation: The molten metal film is broken and atomized into fine droplets under the inherent impact force of the plasma jet 9 and the possible additional auxiliary inert gas flow.

[0048] (5) Cooling: The droplets fly, cool, and spherize in the atomization chamber 10, eventually forming spherical metal powder. The spherical powder eventually enters the powder collection tank. After continuous operation for a specified time, the feeding and plasma torch 8 are stopped. After the system cools to room temperature, the collection tank is sealed, and powder collection is carried out in a glove box environment.

[0049] As can be seen from the above, the plasma atomizing powder-making device of this utility model has the following beneficial effects:

[0050] 1. Through the feeding system and uniform surface melting technology, efficient atomization of metal strip 2 can be achieved, effectively avoiding problems such as unstable strip feeding and uneven melting. The produced powder has high sphericity, narrow particle size distribution, and almost no satellite balls or irregular particles.

[0051] 2. It can significantly reduce costs. Since the rolling cost of metal strip 2 is much lower than the drawing cost of wire, the preparation cost of high-performance spherical powder is greatly reduced. It can effectively improve production efficiency. The cross-sectional area of ​​metal strip 2 can be designed to be larger, allowing for a higher feed rate per unit time, thereby increasing powder yield.

[0052] 3. It can broaden the range of materials for metal powder preparation, and almost all rollable metals and alloys can be used as raw materials, including those materials that cannot be drawn into wires, which greatly expands the applicability of the technology.

[0053] 4. The process is highly controllable, and its stability and repeatability can be ensured through an integrated monitoring and control system.

[0054] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0055] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A plasma atomization powder-making device based on metal strip, comprising an atomization chamber (10), a feeding system, a plasma system, and a vacuum chamber (6), characterized in that: The feeding system is set in the vacuum chamber (6) and includes a conveying mechanism, a correction mechanism (5) and a guiding mechanism. The conveying mechanism is used to convey the metal strip (2) to the atomization chamber (10), and the metal strip (2) passes through the correction mechanism (5) and the guiding mechanism. The correction mechanism (5) can detect and adjust the position of the metal strip (2) in the width direction. The guiding mechanism can guide the conveying of the metal strip (2) and make the metal strip (2) extend in the width direction. The plasma system includes a plasma torch (8) set in the atomization chamber (10). The nozzle of the plasma torch (8) faces the side of the metal strip (2) fed into the atomization chamber (10) by the feeding system. The plasma jet (9) ejected by the plasma torch (8) has a spanwise width L in the width direction of the metal strip (2), or the nozzle of the plasma torch (8) can reciprocate in the width direction of the metal strip (2).

2. The plasma atomization powder-making device according to claim 1, characterized in that: The conveying mechanism includes an unwinding roller (1) and several drive roller groups (4), and the metal strip (2) passes between two rolling rollers of the drive roller group (4) and is in close contact with the two rolling rollers.

3. The plasma atomization powder-making device according to claim 2, characterized in that: The correction mechanism (5) and the guide mechanism are located on the upstream side of the drive roller group (4) along the conveying direction of the metal strip (2).

4. The plasma atomization powder-making apparatus according to claim 1 or 3, characterized in that: The correction mechanism (5) includes a correction roller group (51) and a correction moving component. The metal strip (2) passes between the two rolling rollers of the correction roller group (51) and is in close contact with the two rolling rollers. The correction moving component drives the rolling rollers of the correction roller group (51) to move axially.

5. The plasma atomization powder-making apparatus according to claim 1 or 3, characterized in that: The guiding mechanism includes multiple guide roller groups (3), and the metal strip (2) passes sequentially between the two rolling rollers of each guide roller group (3) and is in close contact with the two rolling rollers.

6. The plasma atomization powder-making apparatus according to claim 1, characterized in that: It also includes a preheating system that can preheat the metal strip (2) in the vacuum chamber (6).

7. The plasma atomization powder-making apparatus according to claim 6, characterized in that: The preheating system includes a power source and two heating electrodes that are in contact with the metal strip (2), and the two heating electrodes are respectively connected to the positive and negative terminals of the power source.

8. The plasma atomization powder-making apparatus according to claim 7, characterized in that: The feeding system includes multiple rolling rollers that contact the metal strip (2), wherein two rolling rollers with a gap in the length direction of the metal strip (2) are made of metal and constitute heating electrodes.

9. The plasma atomization powder-making apparatus according to claim 1, characterized in that: The plasma system includes a scanning drive mechanism (7), which is connected to the plasma torch (8) and drives the plasma torch (8) to move, so that the nozzle of the plasma torch (8) reciprocates in the width direction of the metal strip (2).

10. The plasma atomization powder-making apparatus according to claim 1, characterized in that: The plasma torches (8) are configured as multiple and arranged along the width direction of the metal strip (2), and the total width of the plasma jets (9) ejected by each plasma torch (8) in the width direction of the metal strip (2) is L, or the width of the plasma jet ejected by a single plasma torch (8) in the width direction of the metal strip (2) is L.

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