Machining method of centrifugal rotating disk, centrifugal rotating disk and metal powder preparation method

Abstract

The invention relates to the technical field of metal atomization, aims to solve the problems of short turntable service life and low finished product powder yield during powder preparation of part of metal powder such as aluminum alloy, magnesium alloy, zinc alloy, copper alloy and the like, and provides a machining method of a centrifugal rotating disc, the centrifugal rotating disc and a metal powder preparation method. The machining method of the centrifugal rotating disc comprises the steps that a base material is provided; forging the base material to obtain a disc body, wherein the disc body is provided with a first surface; a disc body is machined, a plurality of annular protrusions are machined on the first surface, the annular protrusions are arranged in a sleeved mode at intervals, and the disc body with the annular protrusions is obtained; performing heat treatment on the disc body provided with the annular bulge; sand blasting processing is conducted, specifically, sand blasting is conducted on the exposed part of the first surface and the surface of the annular protrusion; and thermal spraying processing: thermally spraying a thermal insulation coating on the exposed part of the first surface and the surfaces of the plurality of annular bulges. The powder collecting device has the beneficial effects that the powder collecting rate of finished powder is increased, and the service life of the centrifugal rotating disc is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of metal powders, and in particular to a method for processing a centrifugal rotating disk, a centrifugal rotating disk and a method for preparing metal powders. Background Art

[0002] Centrifugal atomization is a method for preparing metal powder. It controls the metal liquid to flow to the surface of a high-speed rotating turntable. Under the action of centrifugation, the metal liquid is thrown out from the edge of the turntable and solidified into powder particles to complete the preparation of metal powder.

[0003] The known metal powder preparation has the problems of low metal powder preparation efficiency and low powder recovery rate of finished powder. Summary of the invention

[0004] The present application provides a processing method of a centrifugal rotating disk, a centrifugal rotating disk and a metal powder preparation method to solve the problems of low metal powder preparation efficiency and low finished powder collection rate in some known metal powder preparations.

[0005] The embodiment of the present application is implemented as follows:

[0006] In a first aspect, the present application provides a method for processing a centrifugal rotating disk, comprising: providing a substrate; forging the substrate to obtain a disk body, the disk body having a first surface; processing the disk body from the first surface, processing a plurality of annular protrusions on the first surface, the plurality of annular protrusions are mutually nested and spaced from each other to obtain a disk body provided with annular protrusions; heat treating the disk body provided with annular protrusions; sandblasting, sandblasting the exposed portion of the first surface and the surface of the annular protrusions; thermal spraying, coating a thermal insulation coating on the exposed portion of the first surface and the surface of the plurality of annular protrusions, and obtaining a centrifugal rotating disk.

[0007] The centrifugal rotating disk made by the processing method of the centrifugal rotating disk of the present application can increase the processing time of the centrifugal rotating disk at the same high temperature, increase the maximum rotation speed at the same high temperature, and increase the maximum tolerable temperature of the centrifugal rotating disk. After the processing time of the centrifugal rotating disk is increased, under the condition of a certain rotation speed, the production output of the metal powder processed by it can also be increased; after the rotation speed of the centrifugal rotating disk is increased, the centrifugal force on the metal liquid is also increased, and the degree of fragmentation of the metal liquid film into metal droplets is also increased, so that the particle size of the metal powder formed by the solidification of the metal droplets can be reduced, the powder collection rate of the finished product of the metal powder can be increased, and the production efficiency of the metal powder can also be improved; after the maximum tolerable temperature of the centrifugal rotating disk is increased, the temperature of the metal liquid film can also be appropriately increased, so that the activity of the metal liquid film is stronger, which is conducive to increasing the degree of fragmentation of the metal droplets, reducing the particle size of the metal powder, and increasing the powder collection rate of the finished product of the metal powder.

[0008] In a possible implementation, the forging of the substrate includes: forging the substrate by a warm forging process, wherein the initial forging temperature of the warm forging is 1050°C to 1100°C, and the final forging temperature is 850°C to 900°C.

[0009] In a possible embodiment, the heat treatment of the disk body provided with the annular protrusion includes: annealing the disk body provided with the annular protrusion by an isothermal spheroidizing annealing process for two to four hours, and the annealing temperature of the isothermal spheroidizing annealing is 840°C to 890°C; furnace cooling the disk body provided with the annular protrusion to a first cooling temperature and keeping it warm for three to four hours, and the first cooling temperature is 710°C to 740°C; furnace cooling the disk body provided with the annular protrusion to a second cooling temperature again, taking out the disk body provided with the annular protrusion, and air cooling it to room temperature, and the second cooling temperature is not greater than 500°C.

[0010] In a possible implementation, the thermal spraying process includes: spraying a coating material onto the exposed portion of the first surface after sandblasting and the surfaces of the plurality of annular protrusions by plasma spraying or supersonic spraying.

[0011] In a possible implementation, the coating material includes one or more of boron nitride powder, chromium oxide powder, aluminum oxide powder, zirconium oxide powder, or yttria-stabilized zirconium oxide powder.

[0012] In a possible implementation, the powder particle size of the coating material is 20 microns to 200 microns.

[0013] In a possible implementation manner, processing the disc body further includes:

[0014] After the processing of the plurality of annular protrusions is completed, a plurality of openings are processed on each of the annular protrusions, the plurality of openings are distributed at intervals along the circumference of the corresponding annular protrusion, and the openings of two adjacent annular protrusions are staggered.

[0015] In a possible implementation manner, the forging process of the substrate further comprises:

[0016] While forging the disc body, a connecting portion is processed on a surface of the disc body away from the plane to be processed, and the connecting portion is integrally formed with the disc body.

[0017] In a second aspect, the present application provides a centrifugal rotating disk, which is formed by processing using the aforementioned centrifugal rotating disk processing method.

[0018] In the third aspect, the present application provides a method for preparing metal powder, based on the aforementioned centrifugal rotating disk, the method for preparing metal powder includes: melting metal material and forming metal liquid at 850°C to 900°C; controlling the rotation of the centrifugal rotating disk, the rotation speed of the centrifugal rotating disk is 50,000 r / min to 100,000 r / min, injecting the metal liquid onto the thermal insulation coating of the centrifugal rotating disk, the contact position between the metal liquid and the thermal insulation coating is located on the inner side of the annular protrusion in the center of the first surface, the metal liquid forms a metal liquid film on the thermal insulation coating, the metal liquid film is thrown to the edge of the centrifugal rotating disk under the rotation of the centrifugal rotating disk, and then thrown to the outside of the centrifugal rotating disk, and broken into metal droplets, the metal droplets are solidified to form metal powder; collecting the metal powder until the weight of the metal powder processed in a single time is greater than or equal to 50 kilograms. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a flow chart of a method for processing a centrifugal rotating disk according to an embodiment of the present application;

[0021] Figure 2 This is a schematic structural diagram of a centrifugal atomization device according to an embodiment of the present application;

[0022] Figure 3 This is a schematic structural diagram of a centrifugal rotating disk according to an embodiment of the present application;

[0023] Figure 4 A cross-sectional view of a centrifugal rotating disk according to an embodiment of the present application;

[0024] Figure 5 A top view of a centrifugal rotating disk according to an embodiment of the present application;

[0025] Figure 6 This is a flow chart of a method for preparing metal powder according to an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the particle size distribution of metal powder obtained by the method for preparing metal powder according to an embodiment of the present application;

[0027] Figure 8 Schematic diagram of particle size distribution of metal powder prepared in comparative example.

[0028] Description of main component symbols:

[0029]

[0030] DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a centered element. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be a centered element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0034] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0035] Example

[0036] See also Figure 1 and Figure 2 The present embodiment provides a method for processing a centrifugal rotating disk 100, comprising: providing a substrate; forging the substrate to obtain a disk body 10, wherein the disk body 10 has a plane to be processed; processing the disk body 10 to form a first surface 11 on the plane to be processed, and processing a plurality of annular protrusions 20 on the first surface 11, wherein the plurality of annular protrusions 20 are mutually nested and spaced apart, and two adjacent annular protrusions 20 and the first surface 11 jointly form an annular groove 30, so as to obtain a disk body 10 provided with annular protrusions 20; heat treating the disk body 10 provided with the annular protrusions 20; sandblasting the exposed portion of the first surface 11 and the surface of the annular protrusions 20; thermal spraying the exposed portion of the first surface 11 and the surface of the plurality of annular protrusions 20 by thermal spraying a thermal insulation coating 40, and obtaining the centrifugal rotating disk 100.

[0037] In this embodiment, the base material can be set to a metal rod, which can be easily processed to form the disc body 10. The material of the base material can be specifically set to H13 hot working die steel or S136 hot working die steel. Among them, H13 hot working die steel has better heat resistance and can further increase the operating time of the centrifugal rotating disc 100 in a hot environment.

[0038] By processing the substrate through a forging process, the compactness of the disc body 10 can be improved, so that the disc body 10 can still maintain good mechanical properties under high-speed rotation. During the forging process, the internal pores or air pockets of the metal rod are eliminated, reducing the internal defects of the metal rod, thereby improving the structural integrity of the disc body 10, making the disc body 10 have strong toughness, and thus being able to meet the conditions of high-speed rotation. Forging can also improve the impact strength and fatigue resistance of the disc body 10, so that the disc body 10 can receive the metal liquid for a long time without deformation. Therefore, compared with the existing casting, cutting or stamping processing methods, the forged disc body 10 can improve the mechanical properties of the disc body 10 in a targeted manner according to the actual processing environment of the disc body 10, so that the disc body 10 has stronger durability in high-temperature environments and high-speed rotations, so that it can be used in high-temperature environments, high-speed rotations and long processing times.

[0039] The disc body 10 is processed, and a plurality of annular protrusions 20 which are mutually nested and spaced from each other are processed on the first surface 11 of the disc body 10. When the centrifugal rotating disc 100 prepared by the processing method of the centrifugal rotating disc 100 of the present embodiment is working, the metal liquid falls into the inner side of the annular protrusion 20 in the center of the first surface 11 and forms a metal liquid flow. Under the action of gravity, the fluid pressure inside the metal liquid, and the centrifugal force applied to it by the centrifugal rotating disc 100, the metal liquid flow forms a metal liquid film covering the surface of the thermal insulation coating 40, and the metal liquid film flows from the inner side of the disc body 10 to the outer edge of the disc body 10. During the flow process, when the metal liquid film passes through the annular protrusion 20 or the annular groove 30, its stable flow state is disturbed, for example, the annular protrusion 20 exerts a force on the metal liquid film to vibrate upward in the direction away from the first surface 11 along the thickness direction of the annular protrusion 20, and the annular groove 30 exerts a force on the metal liquid film to vibrate downward in the direction close to the first surface 11 along the thickness direction of the annular groove 30. During the flow of the metal liquid film toward the edge of the disk body 10, it is continuously and alternately subjected to forces in opposite directions, which continuously exert a fluctuating force inside the metal liquid film and diffuse to the edge of the metal liquid film in the direction close to the edge of the disk body 10. The centrifugal rotating disk 100 formed by processing in the processing direction of this embodiment has a plurality of annular protrusions 20 and annular grooves 30, which can enable the metal liquid film to form broken metal droplets during the flow toward the edge of the disk body 10, and after continuously passing through the annular protrusions 20 and the annular grooves 30, the larger-sized liquid is continuously broken into smaller-sized liquid. After the metal liquid film or metal droplets are thrown out from the edge of the disk body 10 by the disk body 10, the metal liquid film is broken into metal droplets under the action of centrifugal force, and the metal droplets are fixed in the atomization chamber 204 to form metal powder. During the crushing process, the residual force exerted by the annular protrusion 20 and the annular groove 30 on the metal liquid film can further intensify the degree of crushing, ultimately making the diameter of the formed metal droplets smaller and the time for crushing to form metal droplets shorter, thereby significantly reducing the particle size of the metal powder and improving the centrifugal atomization efficiency of the metal powder.

[0040] By heat treating the disk body 10 provided with the annular protrusion 20, the residual stress in the forging process can be eliminated, and the internal structure of the disk body 10 can be improved, thereby improving the hardness, durability, toughness, strength and other properties of the disk body 10, and ultimately improving the high temperature resistance and durability of the disk body 10, so as to further improve the application range of the disk body 10 and the rotation speed of the centrifugal rotating disk 100.

[0041] Through sandblasting and thermal spraying, the thermal insulation coating 40 can be thermally sprayed on the exposed part of the first surface 11 and the surface of the plurality of annular protrusions 20. The thermal insulation coating 40 has a good thermal insulation effect, thereby reducing the temperature of the molten metal liquid transmitted to the disc body 10, slowing down the high-temperature corrosion of the disc body 10, and making the disc body 10 more durable in a high-temperature environment, so that the single operation time of the centrifugal rotating disc 100 can be significantly improved. In addition, sandblasting can improve the tightness of the connection between the thermal insulation coating 40 and the disc body 10 during the subsequent thermal spraying process, greatly reducing the possibility of the thermal insulation coating 40 falling off, which not only extends the service life of the centrifugal rotating disc 100, but also further enhances the heat corrosion resistance of the disc body 10.

[0042] In summary, the centrifugal rotating disk 100 manufactured by the processing method of the centrifugal rotating disk 100 of the present embodiment can increase the processing time of the centrifugal rotating disk 100 at the same high temperature, increase the maximum rotation speed at the same high temperature, and increase the maximum tolerable temperature of the centrifugal rotating disk 100. After the processing time of the centrifugal rotating disk 100 is increased, under the condition of a constant rotation speed, the production output of the metal powder processed by it can also be increased; after the rotation speed of the centrifugal rotating disk 100 is increased, the centrifugal force on the metal liquid is also increased, and the degree of fragmentation of the metal liquid film into metal droplets is also increased, so that the particle size of the metal powder formed by the solidification of the metal droplets can be reduced, the powder collection rate of the finished product of the metal powder can be increased, and the production efficiency of the metal powder can also be improved; after the maximum tolerable temperature of the centrifugal rotating disk 100 is increased, the temperature of the metal liquid film can also be appropriately increased, so that the activity of the metal liquid film is stronger, which is conducive to increasing the degree of fragmentation of the metal droplets, reducing the particle size of the metal powder, and increasing the powder collection rate of the finished product of the metal powder.

[0043] In this embodiment, the step of forging the substrate includes: forging the substrate by a warm forging process, wherein the initial forging temperature of the warm forging is 1050°C to 1100°C, and the final forging temperature is 850°C to 900°C.

[0044] By processing the substrate through a warm forging process, the substrate can be heated to a recovery temperature or a recrystallization temperature, which can facilitate forging the metal rod into the disc body 10, and improve the mechanical properties and forging quality of the disc body 10, making it more resistant to deformation, so that it can rotate at high speed for a long time.

[0045] In this embodiment, by setting the initial forging temperature higher than the final forging temperature, the recrystallization of the metal rod can be ensured, the deformation resistance can be improved, and the deformed disc body 10 is not easy to form a coarse structure, thereby ensuring the reliability of the mechanical properties of the disc body 10.

[0046] Therefore, by processing the substrate through the warm forging process, the processing time of the disc 10 in the preparation of metal powder can be further increased, and a higher speed rotation can be achieved.

[0047] The initial forging temperature may be set to any one of 1050°C, 1055°C, 1060°C, 1065°C, 1070°C, 1075°C, 1080°C, 1085°C, 1090°C, 1095°C, and 1100°C.

[0048] The final forging temperature may be any one of 850°C, 855°C, 860°C, 865°C, 870°C, 875°C, 880°C, 885°C, 890°C, 895°C, and 900°C.

[0049] In this embodiment, see Figure 2 The step of forging the substrate further includes: while forging the disc body 10, processing a connecting portion 50 on the surface of the disc body 10 away from the plane to be processed, the connecting portion 50 is integrally formed with the disc body 10. The connecting portion 50 is used to connect to the driving device 206, so as to rotate together with the disc body 10 under the drive of the driving device 206.

[0050] The connection part 50 integrally formed with the disc body 10 is forged, and the rotational power of the driving device 206 is transmitted to the disc body 10. In this way, the possibility of the disc body 10 and the connection part 50 breaking after the centrifugal rotating disc 100 rotates at high speed for a long time can be greatly reduced. In addition, since the disc body 10 and the connection part 50 are forged, the connection strength between the two is also higher, and it is more difficult to break compared with the centrifugal rotating disc 100 produced by casting and other processing techniques, thereby further improving the processing time and rotation speed of the centrifugal rotating disc 100 when preparing powder.

[0051] In this embodiment, the step of processing the disc body 10 can be performed by using a CNC machine tool, and firstly rough turning and then fine turning are performed to ensure the processing reliability of the annular protrusion 20 .

[0052] In this embodiment, see Figure 2 The cross section of the processed disc body 10 is circular, the cross sections of the processed multiple annular protrusions 20 are all circular, and the multiple annular protrusions 20 are coaxially arranged, and the central axes of the disc body 10 and the multiple annular protrusions 20 coincide. Through the above-mentioned structural arrangement, when the disc body 10 rotates around the central axis, the metal liquid film formed by the metal liquid flowing to the first surface 11 can be evenly diffused to the annular edge of the disc body 10, thereby improving the uniformity of the metal liquid film in the circumferential direction, so that the metal liquid film can be broken into metal droplets, avoiding the problem of the metal liquid film gathering on one side of the edge of the disc body 10, and ensuring the production of metal powder.

[0053] See also Figure 3In this embodiment, the outer diameter of the disc body 10 is processed to be D1, 30mm≤D1≤200mm.

[0054] When the outer diameter of the disk body 10 is greater than 200 mm, the output power requirement of the driving device 206 is higher, and the operation stability is relatively poor; when the outer diameter of the disk body 10 is less than 30 mm, the centrifugal force is relatively small, and there is a possibility that the metal liquid film is insufficiently broken. In this embodiment, 30 mm ≤ D1 ≤ 200 mm is defined, which can ensure the centrifugal force of the disk body 10, and the output power of the driving device 206 can also meet the rotation speed requirement of the disk body 10, thereby ensuring the formation efficiency of the metal droplets and ensuring the production efficiency.

[0055] In this embodiment, D1 is set to 100 mm. In other embodiments, D1 can be set to any one of 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, and 180 mm. In addition, the range of D1 can also be set to 60 mm ≤ D1 ≤ 120 mm, or further set to 80 mm ≤ D1 ≤ 100 mm. The specific value of D1 can be determined according to the actual milling requirements.

[0056] In this embodiment, see Figure 3 The distance between the surface of the annular protrusion 20 formed by machining and the first surface 11 and the surface away from the second surface 12 along the thickness direction of the disk body 10 is H1, and 1mm≤H1≤3mm.

[0057] When H1 is too small, the forces exerted by the annular protrusion 20 and the annular groove 30 on the metal liquid film will be reduced, so that the degree of breakage of the metal liquid film is reduced, and it is not easy to reduce the particle size of the metal powder; when H1 is too large, the depth of the annular groove 30 is too large, which makes the metal liquid film prone to accumulation, which is not conducive to the throwing out of the metal liquid film. In this embodiment, 1mm≤H1≤3mm is defined, which can ensure that the annular protrusion 20 and the annular groove 30 exert a sufficiently large force on the metal liquid film to ensure that the metal liquid film is broken into metal droplets with smaller particle sizes, and can also greatly reduce the possibility of the metal liquid film accumulating in the annular groove 30, ensuring the normal production of metal powder.

[0058] In this embodiment, H1 is 2 mm. In other embodiments, H1 can also be set to any one of 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, and 3 mm. The specific value of H1 can be determined according to actual milling requirements.

[0059] See also Figure 3 In this embodiment, the distance between the inner side surface of the annular protrusion 20 formed by processing and the outer side surface of the annular protrusion 20 is S1, 2mm≤S1≤3mm.

[0060] When S1 is too large, the metal liquid film is not easy to pass over the annular protrusion 20. When S1 is too small, the spacing between the multiple annular protrusions 20 is too small, and the effect of the annular protrusions 20 on the metal liquid film will also be reduced. Therefore, S1 that is too large or too small cannot achieve a good effect of applying force. In this embodiment, 2mm≤S1≤3mm is limited to ensure that the annular protrusion 20 exerts sufficient force on the metal liquid film to increase the degree of breakage of the metal droplets and reduce the particle size of the metal powder.

[0061] In this embodiment, S1 is 2.6 mm. In other embodiments, S1 can also be set to any one of 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.7 mm, 2.8 mm, 2.9 mm, and 3 mm. S1 can also be set to other sizes according to actual needs.

[0062] In this embodiment, when processing multiple annular protrusions 20, the width of the annular groove 30 in the radial direction of the disc body 10 is controlled to be between 2 mm and 3 mm. If the width is too large, the metal liquid film is easy to accumulate in the annular groove 30, and the force of the annular groove 30 on the metal liquid film will also be reduced. If the width is too small, the top surfaces of the multiple annular protrusions 20 are easy to form a plane, which reduces the force exerted by the annular protrusion 20 on the metal liquid film. By setting the width of the annular groove 30 to between 2 mm and 3 mm, it can be ensured that the annular groove 30 exerts sufficient force on the metal liquid film to increase the degree of breakage of the metal droplets and reduce the particle size of the metal powder.

[0063] In this embodiment, the width of the annular groove 30 is set to 2.3 mm. In other embodiments, the width of the annular groove 30 can also be set to any one of 2 mm, 2.1 mm, 2.2 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, and 3 mm. The width of the annular groove 30 can also be set to other sizes according to actual needs.

[0064] In this embodiment, see Figure 3When the annular protrusion 20 is processed, the top surface of the annular protrusion 20 away from the first surface 11 can be processed into a plane, a concave arc surface facing the first surface 11, a convex arc surface away from the first surface 11, a serrated surface or a special-shaped surface. The shape of the top surface can be adjusted according to actual needs, and the inner side and outer side of the annular protrusion 20 can also be set to any one of a plane, a concave arc surface, a convex arc surface, a serrated surface, a special-shaped surface, etc. By adjusting the shape of the top surface, the inner side surface or the outer side surface of the annular protrusion 20, the force applied by the annular protrusion 20 to the metal liquid film can be changed, thereby playing a role in optimizing the degree of fragmentation of the metal droplets. In addition, among the multiple annular protrusions 20, the shapes of different annular protrusions 20 can be the same, different, or partially the same. Therefore, the shapes of the multiple annular protrusions 20 can be determined according to the actual production needs of the metal powder. In addition, the multiple annular protrusions 20 can be distributed at equal intervals along the radial direction of the disk body 10, or they can be distributed at unequal intervals. The spacing size of two adjacent annular protrusions 20 in the radial direction of the disk body 10 can be determined according to actual needs.

[0065] See also Figure 2 In this embodiment, the number of the annular protrusions 20 can be set to four, five or six. The specific number of the annular protrusions 20 can be set according to actual needs. For example, when the outer diameter of the disc body 10 is small, the number of the annular protrusions 20 can be appropriately reduced. When the outer diameter of the disc body 10 is large, the number of the annular protrusions 20 can be further increased to more than six.

[0066] In this embodiment, see Figure 2 and Figure 4 After the annular protrusions 20 are processed, a plurality of openings 21 are additionally processed on each annular protrusion 20, and the plurality of openings 21 are distributed at intervals along the circumference of the annular protrusion 20. The openings 21 can allow the metal liquid film in the annular groove 30 to flow out, thereby avoiding the phenomenon of the metal liquid film accumulating in the annular groove 30, and ensuring the smooth processing of the metal powder.

[0067] See also Figure 2 In this embodiment, a plurality of openings 21 are evenly distributed on the annular protrusion 20 .

[0068] See also Figure 2 In this embodiment, each annular protrusion 20 is provided with three openings 21. In other embodiments, the number of openings 21 can be determined according to actual needs. For example, the annular protrusion 20 located on the inner side has a smaller circumference, and it can also be provided with a single or two openings 21, and the annular protrusion 20 located on the outer side has a longer circumference, and it can also be provided with four, five or more than six openings 21.

[0069] See also Figure 2 and Figure 4In this embodiment, the corresponding annular protrusion 20 is divided into a plurality of stopper segments 22 spaced apart along the circumference of the disk body 10 by a plurality of openings 21, and the gap between two adjacent stopper segments 22 of each annular protrusion 20 forms an opening 21. In this way, the opening 21 is completely unobstructed by the annular protrusion 20, ensuring that the metal liquid film can flow out from the opening 21.

[0070] In other embodiments, the opening 21 may also be processed into a groove formed by being concave from the top surface of the annular protrusion 20 , as long as the metal liquid film can flow out from the annular groove 30 to the edge of the disk body 10 .

[0071] See also Figure 2 In this embodiment, when processing the opening 21, in two adjacent annular protrusions 20, the opening 21 of one annular protrusion 20 is staggered with the opening 21 of the other annular protrusion 20 in the horizontal direction. In this way, it is possible to prevent the metal liquid film from flowing out from the openings 21 of the plurality of annular protrusions 20 arranged opposite to each other along the radial direction of the disk body 10 in sequence, so as to prevent the metal liquid film at this position from not being affected by the force applied by the annular protrusion 20 and the annular groove 30, thereby ensuring that the metal liquid film can be crushed to a higher degree under the action of the force and reduce the particle size of the metal powder.

[0072] See also Figure 4 In this embodiment, the projections of the plurality of annular protrusions 20 on the first surface 11 are all located inside the edge of the first surface 11. In this way, the metal liquid film entering the outer side of the outermost annular protrusion 20 can be smoothly thrown out from the edge of the disk body 10, broken into metal droplets, and then solidified into metal powder, thereby ensuring the smooth progress of the powder making operation.

[0073] In this embodiment, the step of processing the disc body 10 also includes processing a concave groove 13 on the inner side of the annular protrusion 20 in the center of the first surface 11. In this way, when the centrifugal rotating disc 100 is working, after the metal liquid falls into the groove 13 to form a metal liquid film, the metal liquid film in the groove 13 is thrown outward under the rotation of the disc body 10, and in the process of being thrown out to the outside of the groove 13, the metal liquid film is subjected to the force exerted by the groove 13 on the metal liquid film, so that the metal liquid film is easier to break, aggravating the instability of the metal liquid film, and can improve the degree of breakage of the metal liquid film finally thrown out to the outside of the disc body 10, and reduce the particle size of the solidified metal powder. In addition, the setting of the groove 13 can also facilitate the positioning and installation of the guide tube 2012 and the centrifugal rotating disc 100.

[0074] Of course, in other embodiments, the first surface 11 inside the innermost annular protrusion 20 may not need to be processed and remain in a flat state, or may be processed into any one of a flat surface, an inner concave curved surface, an inner concave serrated surface, an outer convex curved surface, or an outer convex serrated surface. When the protrusion structure is set as an outer convex curved surface or an outer convex serrated surface, it is necessary to ensure that the central axis of the protrusion coincides with the central axis of the disc body 10 to ensure that the metal liquid film can be evenly thrown out and improve the processing reliability of the metal powder.

[0075] In this embodiment, see Figure 3 The processed groove 13 is in a truncated cone shape, and the inner diameter of the groove 13 gradually decreases from the first surface 11 to the second surface 12. In this way, the metal liquid film can be thrown out from the groove opening 21 of the trapezoidal groove, and is subjected to a force during the throwing process, so that the metal liquid film is easier to break and the degree of breaking of the metal liquid film is improved.

[0076] See also Figure 3 In this embodiment, the cross section of the groove 13 is an equilateral inverted trapezoid, and the angle between the side of the groove 13 and the central axis of the disk body 10 is θ, 30°≤θ≤45°. When θ is too large, the groove side of the groove 13 is too flat, and it is not easy to achieve the crushing effect on the metal liquid film. When θ is too small, the groove side of the groove 13 is too steep, so that the metal liquid film is easy to accumulate in the groove 13. In this embodiment, by limiting 30°≤θ≤45°, the accumulation of the metal liquid film can be avoided, and the crushing force effect of the metal liquid film thrown out under the action of the groove 13 can be guaranteed, thereby improving the degree of crushing when it is finally thrown out and reducing the particle size of the solidified metal powder.

[0077] In this embodiment, θ is 35°. In other embodiments, θ can also be set to any one of 30°, 31°, 32°, 33°, 34°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, and 45°. θ can also be adjusted to other angles according to actual processing requirements. Figure 3 In this embodiment, the inner diameter of the bottom surface of the groove 13 formed by machining is S2, 15mm≤S2≤20mm.

[0078] In this embodiment, S2 is set to 20mm. In other embodiments, S2 can also be set to any one of 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, and 35mm. S2 can also be adjusted to other sizes according to actual processing requirements.

[0079] See also Figure 3The groove depth of the groove 13 formed by processing is H3, 3mm≤H3≤5mm.

[0080] If H3 is too small, the force exerted by the groove 13 on the metal liquid film is not large enough, and if H3 is too large, the metal liquid film is easily accumulated in the groove 13. In this embodiment, by limiting 3mm≤H3≤5mm, it is possible to avoid the accumulation of the metal liquid film and ensure that the groove 13 exerts sufficient force on the metal liquid film, thereby increasing the degree of crushing of the metal liquid film and reducing the particle size of the metal powder.

[0081] In this embodiment, H3 is 3.5 mm. In other embodiments, H3 can also be set to any one of 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, and 5 mm. H3 can also be adjusted to other sizes according to actual processing requirements.

[0082] In this embodiment, heat treating the disk body 10 provided with the annular protrusion 20 includes: annealing the disk body 10 provided with the annular protrusion 20 by an isothermal spheroidizing annealing process for two to four hours, the annealing temperature of the isothermal spheroidizing annealing is 840°C to 890°C; furnace cooling the disk body 10 provided with the annular protrusion 20 to a first cooling temperature, and keeping it warm for three to four hours, the first cooling temperature is 710°C to 740°C; after furnace cooling the disk body 10 provided with the annular protrusion 20 to a second cooling temperature again, taking out the disk body 10 provided with the annular protrusion 20, and air cooling it to room temperature, the second cooling temperature is not greater than 500°C.

[0083] Through heat treatment, the disc body 10 can be guaranteed to have a good metallographic structure and appropriate hardness, thereby improving the hardness of the disc body 10, extending the service life of the disc body 10 in a high temperature environment, and being able to withstand a higher rotation speed.

[0084] In this embodiment, after the heat treatment of the disc body 10 provided with the annular protrusion 20, the disc body 10 is first cleaned with a cleaning agent, and then the sandblasting step is performed. The cleaning agent can be acetone.

[0085] In this embodiment, the step of sandblasting includes sandblasting the exposed portion of the first surface 11 and the surface of the annular protrusion 20 with a sandblasting material to roughen them. The sandblasting material can be set to corundum sand, which has high friction and hardness, thereby ensuring the roughening effect, so as to facilitate the subsequent reliable fixing of the thermal insulation coating 40 to the exposed portion of the first surface 11 and the surface of the annular protrusion 20.

[0086] In this embodiment, the thermal spraying process includes: spraying the coating material on the exposed portion of the first surface 11 after the sandblasting and the surfaces of the plurality of annular protrusions 20 by means of plasma spraying or supersonic spraying.

[0087] In this embodiment, the coating material includes one or more of boron nitride powder, chromium oxide powder, aluminum oxide powder, zirconium oxide powder or yttria-stabilized zirconium oxide powder. The above materials all have good heat insulation effects, among which zirconium oxide powder and yttria-stabilized zirconium oxide powder have better heat insulation effects, so that the heat resistance and durability of the final formed centrifugal rotating disk 100 are better, the heat insulation effect can be further improved, and the single processing time of the centrifugal rotating disk 100 can be extended.

[0088] In this embodiment, the powder particle size of the coating material is 20 microns to 200 microns. By limiting the powder particle size of the coating material, reliable combination of the heat insulation coating 40 and the disk body 10 can be ensured.

[0089] In this embodiment, see Figure 3 The thickness of the thermal insulation coating 40 processed by thermal spraying is H2, 0.5mm≤H2≤2mm.

[0090] When H2 is too small, the heat insulation effect of the heat insulation coating 40 is relatively poor, and the protection effect on the disc body 10 is also poor, so that the effect of extending the service life of the disc body 10 is not obvious; when H2 is too large, the connectivity between the heat insulation coating 40 and the disc body 10 is poor, and the processing difficulty is also higher. In this embodiment, 0.5mm≤H2≤2mm is limited, which can not only ensure the heat insulation effect of the heat insulation coating 40 and extend the processing time of the disc body 10, but also reduce the processing difficulty of the heat insulation coating 40 and reduce the processing cost of the centrifugal rotating disc 100.

[0091] This embodiment further provides a centrifugal rotating disk 100, which is formed by the aforementioned processing method of the centrifugal rotating disk 100. The detailed structure of the centrifugal rotating disk 100 is formed by the various processing steps of the aforementioned processing method, and thus will not be described in detail here.

[0092] In this embodiment, the centrifugal rotating disk 100 that has completed each process needs to be subjected to a dynamic balance test before centrifugal atomization powder making can be performed.

[0093] See also Figure 5 The present embodiment further provides a centrifugal atomization device 200 for executing a method for preparing metal powder. The centrifugal atomization device 200 includes a smelting chamber 201, an atomization chamber 203, a powder collecting device 205, a driving device 206, a smelting crucible 2010, a tundish crucible 2011, a flow guide tube 2012, a furnace charge 2013, a vacuum device 2014, and an inflation device 2015.

[0094] The smelting chamber 201 defines a sealed smelting chamber 202. The smelting chamber 201 is provided with an inflation port 2016 and an exhaust port 2017. The inflation port 2016 is connected to the inflation device 2015, and the exhaust port 2017 is connected to the vacuum device 2014. When the centrifugal atomization device 200 is in operation, the air in the smelting chamber 202 is firstly extracted through the vacuum device 2014, and then an inert gas is introduced into the smelting chamber 202 through the inflation device 2015. The inert gas can be specifically set to argon.

[0095] The smelting crucible 2010 and the tundish crucible 2011 are arranged in the smelting chamber 202. The smelting crucible 2010 is used to melt the metal raw material and form the metal liquid. The smelting crucible 2010 injects the molten metal liquid into the tundish crucible 2011. The tundish crucible 2011 is provided with the furnace charge 2013. The tundish crucible 2011 is connected with the guide pipe 2012, and the guide pipe 2012 is connected between the smelting chamber 201 and the atomizing chamber 203.

[0096] The atomizing chamber 203 is connected to the smelting chamber 201 through the guide pipe 2012. The centrifugal rotating disk 100 is arranged in the atomizing chamber 203. The atomizing chamber 203 is provided with two atomizing chambers 204 located on both radial sides of the centrifugal rotating disk 100, and the bottom of each atomizing chamber 204 is connected to a powder collecting device 205 respectively.

[0097] The driving device 206 is disposed outside the atomizing chamber 203 and connected to the centrifugal rotating disk 100 to drive the centrifugal rotating disk 100 to rotate. The driving device 206 includes a driving motor 207, a transmission assembly 209 and an output shaft 208, wherein the transmission assembly 209 is connected to the driving motor 207 and one end of the output shaft 208, and the other end of the output shaft 208 is connected to the centrifugal rotating disk 100.

[0098] When the centrifugal atomization device 200 is operating, the metal liquid flows into the atomization chamber 204 through the guide tube 2012 and falls onto the surface of the centrifugal rotating disk 100. The centrifugal rotating disk 100 rotates under the drive of the driving device 206, and the metal liquid is thrown into the atomization chamber 204. After the metal liquid in the atomization chamber 204 solidifies, it forms metal powder and falls into the bottom of the atomization chamber 204 and enters the powder collecting device 205, thereby completing the processing of the metal powder.

[0099] See also Figure 6, this embodiment also provides a method for preparing metal powder, based on the aforementioned centrifugal rotating disk 100, the method for preparing metal powder includes: melting metal material and forming metal liquid at 850°C to 900°C; controlling the rotation of the centrifugal rotating disk 100, the rotation speed of the centrifugal rotating disk 100 is 50000r / min to 100000r / min, injecting the metal liquid onto the thermal insulation coating 40 of the centrifugal rotating disk 100, the contact position between the metal liquid and the thermal insulation coating 40 is located on the inner side of the annular protrusion 20 in the center of the first surface 11, the metal liquid forms a metal liquid film on the thermal insulation coating 40, the metal liquid film is thrown out to the edge of the centrifugal rotating disk 100 under the rotation of the centrifugal rotating disk 100, and then thrown out to the outside of the centrifugal rotating disk 100, and broken into metal droplets, the metal droplets are solidified to form metal powder; collecting the metal powder until the weight of the metal powder processed in a single time is greater than or equal to 50 kg.

[0100] In this embodiment, since the aforementioned centrifugal rotating disk 100 is used to prepare the metal powder, the single processing time is improved, thereby increasing the single preparation weight of the metal powder to more than 50KG. Since the heat resistance of the centrifugal rotating disk 100 is improved, the temperature of the metal liquid can be appropriately increased, and since the strength of the centrifugal rotating disk 100 is improved, the maximum rotation speed can be increased, thereby increasing the degree of metal liquid film breakage, that is, further reducing the particle size of the metal powder formed by the solidification of the metal droplets.

[0101] In this embodiment, the metal material can be aluminum. Specifically, the metal material is pretreated before melting, and the pretreatment steps are: using 99.9% industrial pure aluminum, removing the surface oxide scale of the aluminum by grinding, and washing it by alcohol ultrasonic wave, and then putting the dried aluminum into the melting crucible 2010.

[0102] Afterwards, the air in the smelting chamber 201 and the atomizing chamber 203 is evacuated by the vacuum device 2014, and the vacuum degree of both is less than 20 Pa. Then, the smelting crucible 2010 and the tundish crucible 2011 are heated by medium frequency induction heating, and the metal material is melted into a metal liquid at 850° C. to 900° C.

[0103] Example

[0104] H13 hot working die steel bar material was selected, and the disc body was obtained after forging and spheroidizing annealing treatment. The outer diameter of the disc body is 100mm, the groove diameter is 15mm, the groove depth is 5mm, and the groove inverted cone angle is 40°. There are 6 annular protrusions, with a height of 2mm and a width of 2mm.

[0105] First, the disc body is cleaned with acetone, and then the exposed portion of the first surface of the disc body and the surface of the annular protrusion are sandblasted with corundum sand to make them rough.

[0106] The coating material is chromium oxide ceramic powder, and a plasma spraying process is used to spray the thermal insulation coating on the exposed part and the annular protrusion of the first surface. The thickness of the thermal insulation coating ceramic coating is 1.5 mm.

[0107] 99.9% industrial pure aluminum is used as the production raw material. The surface oxide scale is polished off and ultrasonically cleaned with alcohol. After being blown dry, it is loaded into a melting crucible with a loading capacity of 50kg.

[0108] A boron nitride flow guide tube with an inner diameter of 3 mm was placed into the tundish crucible.

[0109] The smelting chamber and atomizing chamber are pumped down to below 20Pa through a sliding valve pump and a Roots pump.

[0110] The melting chamber and the atomizing chamber are filled with argon gas to 30Kpa to maintain a slight positive pressure. The melt in the melting crucible is heated to 850℃ and the tundish crucible is heated to 820℃ by medium frequency induction heating.

[0111] The driving device is used to rotate the centrifugal rotating disk at a speed of 60,000 r / min. The aluminum alloy melt is poured from the melting crucible to the tundish crucible. The melt flows along the guide pipe to the high-speed rotating disk and is atomized under the action of centrifugal force to obtain spherical aluminum alloy powder.

[0112] The metal powder obtained in this example is referred to as A.

[0113] See also Figure 7 , take part of the metal powder of A as a powder sample, and detect the particle size distribution of the aluminum alloy powder, where the powder particle size D10 is the particle size corresponding to when the volume cumulative particle size distribution percentage of a powder sample reaches 10%, that is, the volume content of particles smaller than this particle size accounts for 10% of all particles. D50 is the particle size corresponding to when the volume cumulative particle size distribution percentage of a powder sample reaches 50%, also known as the median diameter or median particle size. D90: The particle size corresponding to when the volume cumulative particle size distribution percentage of a powder sample reaches 90%, that is, the volume content of particles smaller than this particle size accounts for 90% of all particles.

[0114] Comparative Example 1

[0115] H13 hot working die steel bar material is selected, and the disc body is obtained through forging and spheroidizing annealing treatment. The outer diameter of the disc body is 100mm and the surface of the disc body is flat.

[0116] 99.9% industrial pure aluminum is used as the production raw material. The surface oxide scale is polished off and ultrasonically cleaned with alcohol. After being blown dry, it is loaded into a melting crucible with a loading capacity of 50kg.

[0117] A boron nitride flow guide tube with an inner diameter of 3 mm was placed into the tundish crucible.

[0118] The smelting chamber and atomizing chamber are pumped down to below 20Pa through a sliding valve pump and a Roots pump.

[0119] The melting chamber and the atomizing chamber are filled with argon gas to 30Kpa to maintain a slight positive pressure. The melt in the melting crucible is heated to 850℃ and the tundish crucible is heated to 820℃ by medium frequency induction heating.

[0120] The driving device is used to rotate the centrifugal rotating disk at a speed of 60,000 r / min. The aluminum alloy melt is poured from the melting crucible to the tundish crucible. The melt flows along the guide pipe to the high-speed rotating disk and is atomized under the action of centrifugal force to obtain spherical aluminum alloy powder.

[0121] The metal powder obtained in this example is referred to as B.

[0122] In Comparative Example 1, when the metal powder was collected to 5 kg, the centrifugal rotating disk was thermally corroded and lost its dynamic balance. The entire rotating electrode shaft made a serious abnormal noise and the atomization process had to be stopped.

[0123] Comparative Example 2

[0124] H13 hot working die steel bar is selected and the disc body is obtained through forging and spheroidizing annealing treatment.

[0125] First, the disc body is cleaned with acetone, and then the exposed portion of the first surface of the disc body and the surface of the annular protrusion are sandblasted with corundum sand to make them rough.

[0126] The coating material is chromium oxide ceramic powder, and a plasma spraying process is used to spray the thermal insulation coating on the exposed part and the annular protrusion of the first surface. The thickness of the thermal insulation coating ceramic coating is 1.5 mm.

[0127] 99.9% industrial pure aluminum is used as the production raw material. The surface oxide scale is polished off and ultrasonically cleaned with alcohol. After being blown dry, it is loaded into a melting crucible with a loading capacity of 50kg.

[0128] A boron nitride flow guide tube with an inner diameter of 3 mm was placed into the tundish crucible.

[0129] The smelting chamber and atomizing chamber are pumped down to below 20Pa through a sliding valve pump and a Roots pump.

[0130] The melting chamber and the atomizing chamber are filled with argon gas to 30Kpa to maintain a slight positive pressure. The melt in the melting crucible is heated to 850℃ and the tundish crucible is heated to 820℃ by medium frequency induction heating.

[0131] The driving device is used to rotate the centrifugal rotating disk at a speed of 60,000 r / min. The aluminum alloy melt is poured from the melting crucible to the tundish crucible. The melt flows along the guide pipe to the high-speed rotating disk and is atomized under the action of centrifugal force to obtain spherical aluminum alloy powder.

[0132] The metal powder obtained in this example is referred to as B2.

[0133] See also Figure 8 , take part of the metal powder of B2 as a powder sample and detect the particle size distribution of the aluminum alloy powder.

[0134] Table 1 is the relevant data of Example, Comparative Example 1 and Comparative Example 2.

[0135] The centrifugal rotating disk prepared in comparative example 1 lacks a heat-insulating coating compared to the centrifugal rotating disk prepared in the embodiment. During the processing of comparative example 1, the disk body of the centrifugal rotating disk is corroded by the high-temperature metal liquid. After running for a period of time, when the metal powder is collected to about 5 kg, the disk body loses dynamic balance, and the output shaft produces a serious abnormal sound, thereby stopping the atomization operation. It can be seen that the heat-insulating coating of the centrifugal rotating disk of this embodiment can significantly increase the operating time of the centrifugal rotating disk.

[0136] Compared with the centrifugal rotating disk prepared in the embodiment, the centrifugal rotating disk prepared in the comparative example 2 has no annular protrusions and grooves on the disk surface. The powder particle size D10 of the comparative example 2 is slightly larger than the powder particle size D10 of the embodiment, the powder particle size D50 of the comparative example 2 is larger than the powder particle size D50 of the embodiment, and the powder particle size D90 of the comparative example 2 is larger than the powder particle size D90 of the embodiment. The theoretical yield of the finished powder of the embodiment is 64.51%, and the theoretical yield of the finished powder of the comparative example 2 is 34.76%. Obviously, after the centrifugal rotating disk of this embodiment is provided with grooves and annular protrusions, the powder particle size of the metal powder can be greatly reduced, and the finished product yield of the metal powder can be improved.

[0137] Table 1

[0138]

[0139] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A method for processing a centrifugal rotating disk, characterized in that: include: providing a substrate; Forging the substrate to obtain a disc body having a first surface; Processing a disc body from the first surface, processing a plurality of annular protrusions on the first surface, wherein the plurality of annular protrusions are mutually nested and spaced apart from each other, so as to obtain a disc body provided with annular protrusions; heat treating a disc body provided with an annular protrusion; Sandblasting: sandblasting the exposed portion of the first surface and the surface of the annular protrusion; Thermal spraying is performed to coat the exposed portion of the first surface and the surfaces of the plurality of annular protrusions with a heat-insulating coating, thereby obtaining a centrifugal rotating disk.

2. The method for processing a centrifugal rotating disk according to claim 1, characterized in that: The forging process of the substrate comprises: The substrate comprises hot working die steel, and the hot working die steel is forged by a warm forging process, wherein the initial forging temperature of the warm forging is 1050°C to 1100°C, and the final forging temperature is 850°C to 900°C.

3. The method for processing a centrifugal rotating disk according to claim 1, characterized in that: The heat treatment of the disc body provided with the annular protrusion comprises: Annealing the disk body provided with the annular protrusion by an isothermal spheroidizing annealing process for two to four hours, wherein the annealing temperature of the isothermal spheroidizing annealing is 840° C. to 890° C.; Furnace cooling the disk body provided with the annular protrusion to a first cooling temperature, and keeping the temperature for three to four hours, wherein the first cooling temperature is 710° C. to 740° C.; After the disk body provided with the annular protrusion is furnace-cooled again to a second cooling temperature, the disk body provided with the annular protrusion is taken out and air-cooled to room temperature, wherein the second cooling temperature is not greater than 500°C.

4. The method for processing a centrifugal rotating disk according to claim 1, characterized in that: The thermal spraying process comprises: The coating material is sprayed on the exposed portion of the first surface after sandblasting and the surfaces of the plurality of annular protrusions by plasma spraying or supersonic spraying.

5. The method for processing a centrifugal rotating disk according to claim 4, characterized in that: The coating material includes one or more of boron nitride powder, chromium oxide powder, aluminum oxide powder, zirconium oxide powder or yttria-stabilized zirconium oxide powder.

6. The method for processing a centrifugal rotating disk according to claim 5, characterized in that: The powder particle size of the coating material is 20 microns to 200 microns.

7. The method for processing a centrifugal rotating disk according to claim 1, characterized in that: The processing of the disc body also includes: After the processing of the plurality of annular protrusions is completed, a plurality of openings are processed on each of the annular protrusions. The plurality of openings are distributed at intervals along the circumference of the corresponding annular protrusion, and the openings of two adjacent annular protrusions are staggered.

8. The method for processing a centrifugal rotating disk according to claim 1, characterized in that: The forging process of the substrate further comprises: While forging the disc body, a connecting portion is processed on a surface of the disc body away from the plane to be processed, and the connecting portion is integrally formed with the disc body.

9. A centrifugal rotating disk, characterized in that: The centrifugal rotating disk is formed by the processing method according to any one of claims 1 to 8.

10. A method for preparing metal powder, characterized in that: Based on the centrifugal rotating disk according to claim 9, the method for preparing the metal powder comprises: Melting metal materials to form liquid metal; Controlling the centrifugal rotating disk to rotate at a speed of 50,000 r / min to 100,000 r / min, injecting the metal liquid onto the thermal insulation coating of the centrifugal rotating disk, wherein the contact position between the metal liquid and the thermal insulation coating is located on the inner side of the annular protrusion at the center of the first surface, and the metal liquid forms a metal liquid film on the thermal insulation coating. The metal liquid film is thrown out to the edge of the centrifugal rotating disk under the rotation of the centrifugal rotating disk, and then thrown out to the outside of the centrifugal rotating disk, and is broken into metal droplets, which are solidified to form metal powder; The metal powder is collected.

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