A multi-porous centrifugal turntable and its design method and powder preparation system

Abstract

The present invention provides a multi-porous centrifugal turntable and its design method and powder preparation system, which relate to the field of metal additive manufacturing technology. The multi-porous centrifugal turntable includes a turntable body, and the upper surface of the turntable body is provided with a first area and a second area, the first area is used to receive the melt and accelerate the flow speed of the melt by rotation; at least one circle of channel structure is provided in the second area; the channel structure surrounds the first area and includes a plurality of lattices arranged in an interval along the circumferential direction of the first area, and a channel for the melt to pass through is formed between two adjacent lattices; the second area is used to stir the melt through the lattice when rotating with the turntable body. The multi-porous centrifugal turntable of the present invention solves the problem of uneven distribution of nano-ceramic particles in composite metal powders due to the agglomeration behavior of nano-particles, and achieves the effect of improving the distribution uniformity of nano-ceramic particles and thus ensuring the quality of the finished powder.

Description

Technical Field

[0001] The present invention relates to the technical field of metal additive manufacturing, and in particular to a multi-channel centrifugal turntable and a design method thereof and a powder preparation system. Background Art

[0002] The application of metal additive manufacturing technology in the field of composite material manufacturing has attracted more and more attention because it can produce metal-based composite components with unique microstructures and mechanical properties at a lower cost, and high-quality nanoparticle composite metal powder can effectively improve the performance of metal additive manufacturing components.

[0003] In the process of preparing nanoparticle composite metal powder, whether prefabricating nanoceramic particles and matrix metal materials into atomized alloy precursors, adding nanoceramic particles into the melt of metal materials, or adding nanoparticles into the high-speed atomizing gas flow of the matrix metal melt, the agglomeration behavior of the nanoparticles will lead to uneven distribution of nanoceramic particles in the composite metal powder, which will seriously affect the quality of the finished powder.

[0004] At present, there is still a lack of efficient preparation technology for discontinuous ceramic particle reinforced metal matrix composite powders suitable for metal additive manufacturing technology. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-porous centrifugal turntable and its design method and powder preparation system, which solves the problem of uneven distribution of nano-ceramic particles in composite metal powder due to the agglomeration behavior of nano-particles, thereby achieving the effect of improving the distribution uniformity of nano-ceramic particles and thus ensuring the quality of the powder product.

[0006] In a first aspect, the present invention provides a multi-porous centrifugal turntable, comprising a turntable body, wherein the upper surface of the turntable body is provided with a first area and a second area, wherein the first area is used to receive a melt and accelerate the flow speed of the melt by rotating; and at least one circle of pore structures is provided in the second area;

[0007] The channel structure surrounds the first region and includes a plurality of lattices spaced apart in a circumferential direction of the first region, and a channel for the melt to pass through is formed between two adjacent lattices; the second region is used to stir the melt through the lattices when rotating with the turntable body.

[0008] The multi-porous centrifugal turntable provided by the present invention increases the probability of breaking nano-particle agglomerates by utilizing the pore structure, thereby breaking up the nano-particles in the matrix metal melt, thereby improving the distribution uniformity of the nano-ceramic particles, which is beneficial to ensuring the quality of the finished powder product.

[0009] Furthermore, a plurality of circles of the channel structure are provided in the second region, the plurality of circles of the channel structure are arranged at intervals along the radial direction of the first region, and the channels corresponding to two adjacent circles of the channel structure are staggered along the circumferential direction of the first region.

[0010] The melt is broken by both shearing and impact. Under these two effects, the mixing effect between the nanoparticles and the matrix metal melt can be effectively enhanced, thereby further ensuring the uniform distribution of the nanoparticles, which is conducive to the preparation of high-quality powder products.

[0011] Furthermore, a plurality of flow-guiding skeletons are arranged between two adjacent circles of the channel structure, and any one of the channels of the channel structure close to the first area in two adjacent circles of the channel structure is connected with a plurality of channels of the channel structure far away from the first area in two adjacent circles of the channel structure through the corresponding flow-guiding skeleton.

[0012] It can not only improve the crushing efficiency, but also more fully crush the nanoparticle agglomerates in each melt, thereby achieving more delicate crushing, thereby making the nanoparticle distribution more uniform.

[0013] Furthermore, a third area is provided on the upper surface of the turntable body, and the third area surrounds the second area and includes a flat surface portion.

[0014] The melt is accelerated again by the flat surface, thereby ensuring that the melt has sufficient peripheral speed to be thrown off the centrifugal turntable and atomized into a powder product.

[0015] Furthermore, the third region also includes an inclined portion with a surface inclined upward and outward.

[0016] Furthermore, the pores are of a single-layer structure.

[0017] Furthermore, the channel is a multi-layer structure stacked along the axial direction of the turntable body.

[0018] Furthermore, the cross-sectional shape of the channel is one of an ellipse, a circle, a square, and a polygon.

[0019] In a second aspect, the present invention provides a design method for the multi-porous centrifugal turntable, comprising the following steps:

[0020] B1. Obtaining the flow area of ​​the melt in the first region along the flow direction as the first flow area;

[0021] B2. Calculate the first pore area based on the first flow area; the first pore area is 1.5-4 times the first flow area;

[0022] B3. Setting the pore area of ​​the pore closest to the first region to be equal to the first pore area to obtain the pore structure closest to the first region.

[0023] Furthermore, the specific steps in step B1 include:

[0024] B11. Calculate the first flow area according to the following formula:

[0025] ;

[0026] in, is the first flow area, is the dynamic viscosity of the melt, is the volume flow rate of the melt, is the diameter of the first region, is the melt density of the melt, is the rotation speed of the turntable body, is the specified angle.

[0027] Furthermore, the method further comprises the following steps:

[0028] C1. Obtaining the flow area of ​​the melt between two adjacent circles of the channel structure along the flow direction and using it as the second flow area;

[0029] C2. Calculate the second pore area according to the second flow area; the second pore area is 1.5-2 times the second flow area;

[0030] C3. Setting the pore area of ​​the pores in two adjacent circles away from the first region to be equal to the second pore area, thereby obtaining a pore structure in two adjacent circles away from the first region.

[0031] Furthermore, the specific steps in step C1 include:

[0032] C11. Calculate the second flow area according to the following formula:

[0033] ;

[0034] in, is the second flow area of ​​the i-th, is the dynamic viscosity of the melt, is the volume flow rate of the melt, is the radius of the side of the pore structure of the i-th circle close to the first area, is the melt density of the melt, is the rotation speed of the turntable body, is the specified angle, is the total number of circles of the pore structure in the second region.

[0035] In a third aspect, the present invention provides a powder preparation system, comprising the multi-porous centrifugal turntable described above.

[0036] Furthermore, the upper surface of the turntable body is also provided with a third area, and the third area includes a plane portion with a straight and horizontal surface and an inclined portion with a surface inclined upward and outward;

[0037] The powder preparation system further comprises an atomizing spray disc, which is arranged above the turntable body and is provided with an air nozzle, the air nozzle is used to spray airflow toward the edge of the turntable body, and the airflow angle of the air nozzle and the angle between the plane portion and the inclined portion meet the following conditions:

[0038] ;

[0039] ;

[0040] in, is the airflow angle, is the angle.

[0041] From the above, it can be seen that the multi-porous centrifugal turntable provided by the present invention utilizes the pore structure on the surface to disperse nanoparticles through impact, shearing and crushing, thereby reducing nanoparticle agglomerates and making the nanoparticles more evenly distributed in the matrix metal melt, thereby achieving the effect of improving the quality of the powder product.

[0042] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic structural diagram of a first multi-channel centrifugal turntable provided in an embodiment of the present invention.

[0044] Figure 2 Schematic diagram of the structure of the first turntable body in the embodiment of the present invention.

[0045] Figure 3 for Figure 2 Schematic diagram of the local structure marked with a.

[0046] Figure 4 Schematic diagram of the structure of the second turntable body in the embodiment of the present invention.

[0047] Figure 5 for Figure 4Schematic diagram of the local structure marked with b.

[0048] Figure 6 A schematic structural diagram of a second multi-channel centrifugal turntable provided in an embodiment of the present invention.

[0049] Figure 7 Schematic diagram of the structure of the first pore structure in an embodiment of the present invention.

[0050] Figure 8 Schematic diagram of the structure of the second channel structure in an embodiment of the present invention.

[0051] Fig. 9 Schematic diagram of the structure of the third channel structure in an embodiment of the present invention.

[0052] Fig.10 This is a flowchart of steps B1-B3 in the design method provided in an embodiment of the present invention.

[0053] Fig.11 This is a flowchart of steps C1-C3 in the design method provided in an embodiment of the present invention.

[0054] Fig.12 A schematic diagram of the structure of a powder preparation system provided in an embodiment of the present invention.

[0055] Fig.13 This is a position structure diagram of an atomizing spray disc and a rotating disc body in a powder preparation system provided in an embodiment of the present invention.

[0056] Description of labels:

[0057] 100, turntable body; 110, first area; 120, second area; 130, third area; 131, plane part; 132, inclined part; 200, channel structure; 210, lattice; 220, channel; 230, flow guide skeleton; 300, atomizing spray disc; 310, gas nozzle; 400, smelting chamber; 410, smelting crucible; 420, tundish; 500, atomizing chamber; 600, flow guide nozzle; 700, cyclone separator; 800, dust collector; 900, induced draft fan; 1100, first powder collecting tank; 1200, second powder collecting tank; 1300, third powder collecting tank. DETAILED DESCRIPTION

[0058] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0062] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0063] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0064] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0065] Reference Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 and attached Figure 6 The present invention provides a multi-porous centrifugal turntable, comprising a turntable body 100, wherein the upper surface of the turntable body 100 is provided with a first area 110 and a second area 120, wherein the first area 110 is used to receive the melt and accelerate the flow speed of the melt by rotating; and the second area 120 is provided with at least one circle of pore structures 200;

[0066] The channel structure 200 surrounds the first region 110 and includes a plurality of lattices 210 spaced apart in a circumferential direction of the first region 110 , with channels 220 for the melt to pass through being formed between two adjacent lattices 210 ; the second region 120 is used to stir the melt through the lattices 210 when the turntable body 100 rotates.

[0067] In this embodiment, in actual application, the melt flows from top to bottom into the first area 110 through the guide nozzle and then rotates with the turntable body 100. The melt gradually flows to the second area 120 under the action of centrifugal force, wherein the first area 110 is mainly used to accelerate the melt so that the melt has a larger circumferential velocity and contacts the pore structure 200 in the second area 120. When the melt contacts the pore structure 200 in the second area 120, multiple lattices 210 stir the melt, and the melt is subjected to shear and collision, resulting in the breakage of nanoparticle agglomerates in the melt, thereby improving the uniformity of the nanoparticles in the melt.

[0068] Specifically, by setting multiple circles of channel structures 200 in the second area 120 (all the channel structures 200 are centered on the center of the centrifugal turntable and the diameters gradually expand outward, and the channel structures 200 located on the outside surround the channel structures 200 located on the inside, thereby forming a multi-layer circular ring shape), after the melt passes through the first circle of channel structures 200 and is crushed for the first time, it flows from the channels 220 of the first circle of channel structures 200 to the second circle of channel structures 200 and is crushed for the next time. Therefore, through multiple crushings, it is ensured that the nanoparticles can be evenly distributed in the melt. At the same time, the relative slip and uneven distribution problems caused by the density difference between the nanoparticles and the matrix metal melt under the action of ultra-gravity can also be eliminated.

[0069] In certain preferred embodiments, Figure 2 and attached Figure 4 A plurality of circles of channel structures 200 are provided in the second region 120 , and the plurality of circles of channel structures 200 are arranged at intervals along the radial direction of the first region 110 , and the channels 220 corresponding to two adjacent circles of channel structures 200 are staggered along the circumferential direction of the first region 110 .

[0070] In this embodiment, in actual application, because the channels 220 corresponding to two adjacent circles of channel structures 200 are arranged in a staggered manner, the melt will hit the lattice 210 of the next circle of channel structure 200 after passing through the previous circle of channel structure 200, and finally flow out from the channels 220 of the next circle of channel structure 200 after being stirred by the lattice 210 of the next circle of channel structure 200. In the whole process, the melt is broken by shearing and by impact. Under these two effects, the mixing effect between the nanoparticles and the matrix metal melt can be effectively enhanced, thereby further ensuring the uniform distribution of the nanoparticles, which is conducive to the preparation of high-quality powder products.

[0071] In certain embodiments, referring to Figure 4A plurality of flow guiding skeletons 230 are arranged between two adjacent circles of channel structures 200, and any one of the channels 220 of the channel structure 200 close to the first area 110 in the two adjacent circles of channel structures 200 is connected with a plurality of channels 220 of the channel structure 200 far away from the first area 110 in the two adjacent circles of channel structures 200 through the corresponding flow guiding skeleton 230.

[0072] In this embodiment, the flow guide skeleton 230 is, for example, a vertical rib extending in the axial direction of the centrifugal turntable. The end of the vertical rib close to the first area 110 can be designed as a streamlined structure, thereby better guiding the flow of the melt. Two adjacent flow guide skeletons 230 surround to form a channel, and the maximum width of the channel close to the end of the first area 110 is generally less than 0.5 mm. After the melt passes through the channel 220 of the first circle channel structure 200, it collides with the corresponding flow guide skeleton 230, thereby performing an additional crushing and being diverted into multiple melts. The volume of each melt after diversion becomes smaller. After the melt flows into the second circle channel structure 200, the lattice 210 of the second circle channel structure 200 will crush a small melt separately, which can not only improve the crushing efficiency, but also more fully crush the nanoparticle agglomerates in each melt, thereby achieving more delicate crushing, so that the nanoparticles are distributed more evenly.

[0073] In certain embodiments, referring to Figure 6 A third area 130 is further provided on the upper surface of the turntable body 100 . The third area 130 surrounds the second area and includes a flat surface portion 131 .

[0074] In this embodiment, a third area 130 is arranged outside the second area 120 and the melt is accelerated again through the plane portion 131 (equivalent to the function of the first area 110 ), thereby ensuring that the melt has sufficient circumferential velocity to be thrown off the centrifugal turntable and atomized to form a powder product.

[0075] In certain preferred embodiments, Figure 1 The third region 130 further includes an inclined portion 132 whose surface is inclined upward and outward, and an angle is formed between the inclined portion 132 and the plane portion 131 .

[0076] In certain embodiments, referring to Figure 7 and attached Figure 8 , the channel 220 is a single-layer structure.

[0077] In certain embodiments, referring to Fig. 9 The channel 220 is a multi-layer structure stacked along the axial direction of the turntable body 100.

[0078] In some embodiments, the cross-sectional shape of the channel 220 is one of an ellipse, a circle, a square, and a polygon.

[0079] In the above embodiment, the channels 220 of one of the two adjacent circles of channel structures 200 may be a single-layer structure and the channels 220 of the other circle of channel structures 200 may be a multi-layer structure. The cross-sectional shapes of the channels 220 of the same circle of channel structures 200 may be all the same, partly the same, or all different, and the channels 220 of different circles of channel structures 200 may also be all the same, partly the same, or all different.

[0080] Reference Fig.10 The present invention provides a design method for the multi-channel centrifugal turntable in the above embodiment, comprising the following steps:

[0081] B1. Obtaining the flow area of ​​the melt in the first region along the flow direction and using it as the first flow area;

[0082] B2. Calculate the first pore area based on the first flow area; the first pore area is 1.5-4 times the first flow area;

[0083] B3. Set the pore area of ​​the pore closest to the first region to be equal to the first pore area to obtain the pore structure closest to the first region.

[0084] Specifically, the specific steps in step B1 include:

[0085] B11. Calculate the first flow area according to the following formula:

[0086] ;

[0087] in, is the first flow area, is the dynamic viscosity of the melt, is the volume flow rate of the melt, is the diameter of the first region, is the melt density of the melt, is the rotation speed of the turntable body, is the specified angle.

[0088] In certain embodiments, referring to Fig.11 , the design method also includes the following steps:

[0089] C1. Obtaining the flow area of ​​the melt between two adjacent pore structures along the flow direction and using it as the second flow area;

[0090] C2. Calculate the second pore area based on the second flow area; the second pore area is 1.5-2 times the second flow area;

[0091] C3. The pore area of ​​the pores in two adjacent circles away from the first region is set to be equal to the second pore area, so as to obtain a pore structure in two adjacent circles away from the first region.

[0092] Specifically, the specific steps in step C1 include:

[0093] C11. Calculate the second flow area according to the following formula:

[0094] ;

[0095] in, is the second flow area of ​​the ith is the dynamic viscosity of the melt, is the volume flow rate of the melt, is the radius of the side of the i-th circle channel structure close to the first area, is the melt density of the melt, is the rotation speed of the turntable body, is the specified angle, is the total number of circles of the channel structure in the second area.

[0096] In practical applications, the characteristic diameter of all pores (denoted as ) generally does not exceed 0.5mm. When the cross-sectional shape of the hole is elliptical, the characteristic diameter of the hole refers to the diameter of the major axis of the ellipse; when the cross-sectional shape of the hole is polygonal, the characteristic diameter of the hole refers to the diameter of the inscribed circle of the polygon.

[0097] When the channel is a single-layer structure, that is, a single channel includes one flow channel, the characteristic diameter of the channel refers to the characteristic diameter of the corresponding flow channel. When the cross-sectional shape of the flow channel is an ellipse, the characteristic diameter of the flow channel refers to the major axis diameter of the ellipse; when the cross-sectional shape of the flow channel is a polygon, the characteristic diameter of the flow channel refers to the diameter of the inscribed circle of the polygon.

[0098] When the channel is a multi-layer structure, that is, a single channel includes multiple flow channels stacked along the axial direction of the turntable body, the characteristic diameter of the channel refers to the characteristic diameter of each flow channel, that is, the characteristic diameters of all flow channels generally do not exceed 0.5 mm. When the cross-sectional shape of the flow channel is an ellipse, the characteristic diameter of the flow channel refers to the major axis diameter of the ellipse; when the cross-sectional shape of the flow channel is a polygon, the characteristic diameter of the flow channel refers to the diameter of the inscribed circle of the polygon.

[0099] Therefore, for the pores of the multilayer structure, the first pore area can be calculated according to the following formula:

[0100] ;

[0101] in, is the first pore area, is the total number of channels contained in the channel structure closest to the first region, It is the sum of the flow areas of all flow channels contained in a single channel in the channel structure closest to the first region.

[0102] According to step B2, we know 1.5-4 times .

[0103] The second pore area can be calculated according to the following formula:

[0104] ;

[0105] in, is the area of ​​the i-th second pore, is the total number of channels contained in the ith circle channel structure, It is the sum of the flow areas of all flow channels contained in a single channel in the i-th circle of channel structure.

[0106] According to step C2, we know 1.5-2 times .

[0107] In addition, the specified angle is calculated according to the following formula:

[0108] (Formula 1);

[0109] in, is the specified angle, is the preset feature size, is the melt density of the melt, is the acceleration due to gravity, is the supergravity field strength at the edge of the upper surface of the turntable body, is the diameter of the upper edge of the turntable body, is the dynamic viscosity of the melt, is the volume flow rate of the melt.

[0110] The following is an explanation of the derivation process of Formula 1:

[0111] It is known that the diameter of the upper surface edge of the turntable body (i.e. the diameter of the bevel edge) is , the radius of the upper surface edge of the turntable body (i.e. the length of the edge of the inclined surface from the rotation axis OZ of the turntable body in the radial direction) is , the rotation speed of the turntable body is .

[0112] The circumferential velocity at each position on the upper surface of the turntable body is calculated according to the following formula:

[0113] (Formula 2);

[0114] in, is the circumferential velocity of the jth position on the upper surface of the turntable body, is the length of the jth position on the upper surface of the turntable body from the rotation axis OZ of the turntable body in the radial direction, and j is a positive integer.

[0115] According to formula 2, the centrifugal acceleration at each position on the upper surface of the turntable body can be obtained:

[0116] (Formula 3);

[0117] in, is the centrifugal acceleration at the jth position on the upper surface of the turntable body.

[0118] By transforming formula 3, we can get:

[0119] ;Right now (Formula 4);

[0120] in, is the supergravity field strength formed at the jth position on the upper surface of the turntable body, is the acceleration due to gravity.

[0121] The liquid film flow area of ​​the melt at each position on the upper surface of the turntable body along the normal direction perpendicular to the contour line of the upper surface of the turntable body is calculated according to the following formula:

[0122] (Formula 5);

[0123] in, It is the liquid film flow area of ​​the melt at the jth position on the upper surface of the turntable body along the normal direction perpendicular to the contour line of the upper surface of the turntable body.

[0124] According to Formula 5, when the melt spreads radially along the turntable body, the liquid film flow area of ​​the melt along the normal direction perpendicular to the upper surface contour of the turntable body gradually increases. In order to improve the yield of the finished powder product, the liquid film flow area of ​​the melt at the edge of the upper surface of the turntable body along the normal direction perpendicular to the upper surface contour of the turntable body should be reduced. The liquid film flow area is related to the liquid film thickness. Therefore, the yield of the finished powder product can be improved by controlling the liquid film thickness.

[0125] Specifically, the liquid film thickness of the melt at each position on the upper surface of the turntable body along the normal direction perpendicular to the contour line of the upper surface of the turntable body is calculated according to the following formula:

[0126] (Formula 6).

[0127] in, It is the thickness of the liquid film of the melt at the jth position on the upper surface of the turntable body along the normal direction perpendicular to the contour line of the upper surface of the turntable body.

[0128] According to formula 6, combined , the characteristic size of the melt at the edge of the upper surface of the turntable body can be calculated by the following formula:

[0129] (Formula 7);

[0130] In addition, according to Formula 4, the intensity of the supergravity field formed on the edge of the upper surface of the turntable body can be calculated by the following formula:

[0131] (Formula 8);

[0132] Substituting Formula 8 into Formula 7, we can obtain Formula 1.

[0133] It should be noted that, for the turntable body having only the plane portion 131 in the third region, the first region 110, the second region 120 and the plane portion 131 are designed as flat surfaces, which may be parallel to the horizontal plane or not, and the angle between the flat surface and the horizontal plane is the specified angle. , .

[0134] Furthermore, when the flat surface is parallel to the horizontal plane, due to According to formula 1, we can get: , so it can be selected by , and Parameters:

[0135] a1. Determine the parameters , and ( Generally no more than 0.5 mm), Choose a suitable value between 1000-100000. Choose a suitable value between 30-120mm;

[0136] a2. Calculate according to formula 8 .

[0137] When the flat surface is not parallel to the horizontal plane, it can be selected in the following way , and Parameters:

[0138] b1. Determine parameters , and ( Generally no more than 0.5 mm), Choose a suitable value between 1000-100000. Choose a suitable value between 30-120mm;

[0139] b2. Calculate according to formula 1 ;

[0140] b3. Calculate according to formula 8 .

[0141] For the turntable body having the plane portion 131 and the inclined portion 132 in the third region, the first region 110, the second region 120 and the plane portion 131 are designed as straight surfaces, which are parallel to the horizontal plane. At this time, the angle between the straight surface and the inclined portion (i.e., the angle between the plane portion 131 and the inclined portion 132) is used as the specified angle. , .

[0142] In practical applications, control the specified angle The angle can adjust the yield of powder products, which is beneficial to reduce losses and increase production. The upper surface of the multi-porous centrifugal turntable is designed.

[0143] The present invention provides a powder preparation system, comprising the multi-porous centrifugal turntable in the above embodiment.

[0144] In certain embodiments, referring to Fig.13 The upper surface of the turntable body 100 is further provided with a third area 130, and the third area 130 includes a flat and horizontal plane portion 131 and an inclined portion 132 with a surface inclined upward and outward;

[0145] The powder preparation system further includes an atomizing spray disc 300, which is disposed above the turntable body 100 and is provided with an air nozzle 310, the air nozzle 310 is used to spray airflow toward the edge of the turntable body 100, and the airflow angle of the air nozzle 310 and the angle between the plane portion 131 and the inclined portion 132 meet the following conditions:

[0146] ;

[0147] ;

[0148] in, is the airflow angle, is the angle.

[0149] In this embodiment, the airflow angle and included angle of the air nozzle 310 satisfy the above conditions to ensure the relative speed between the melt thrown from the centrifugal turntable and the jet airflow, thereby ensuring the atomization effect.

[0150] In certain embodiments, referring to Fig.12 The powder preparation system further includes a smelting chamber 400, an atomizing chamber 500, a guide nozzle 600, a cyclone separator 700, a dust collector 800, an induced draft fan 900, a first powder collecting tank 1100, a second powder collecting tank 1200 and a third powder collecting tank 1300;

[0151] The smelting chamber 400 includes a smelting crucible 410 and a tundish 420. The smelting crucible 410 is used to smelt the base metal masterbatch into a base metal melt, and the nanoparticles are also put into the smelting crucible 410 to mix with the base metal melt. In order to reduce the agglomeration degree of the nanoparticles, additional measures such as electromagnetic stirring, gas stirring, and ultrasonic stirring can be performed on the smelting crucible 410. The tundish is used to receive the melt poured out of the smelting crucible and refine the melt. In order to further reduce the agglomeration degree of the nanoparticles, additional measures such as electromagnetic stirring, gas stirring, and ultrasonic stirring can also be performed on the tundish 420.

[0152] The atomization chamber 500 is used to atomize the melt to produce a powder product. A centrifugal turntable and an atomization spray disc 300 are installed therein, and the bottom end is connected to the first powder collecting tank 1100 .

[0153] The guide nozzle 600 connects the smelting chamber 400 and the atomizing chamber 500, wherein the upper end of the guide nozzle 600 is connected to the lower end of the tundish 420, and the lower end of the guide nozzle 600 extends into the atomizing chamber 500. The guide nozzle 600 is used to guide the melt to flow onto the centrifugal turntable.

[0154] The cyclone separator 700 is connected to the atomization chamber 500 through an exhaust duct and its bottom end is connected to the second powder collecting tank 1200. The cyclone separator 700 is used to separate coarse powder and fine powder in the powder product. The coarse powder is collected in the first powder collecting tank 1100, and the fine powder enters the cyclone separator 700 through the exhaust duct and is collected in the second powder collecting tank 1200.

[0155] The dust collector 800 is connected to the cyclone separator 700 through a pipeline and the bottom end is connected to the third powder collecting tank 1300. The dust collector 800 is used to filter the ultrafine powder in the powder product, and the ultrafine powder is collected in the third powder collecting tank 1300.

[0156] The induced draft fan 900 is connected to the dust collector 800 and is used to discharge the atomized waste gas after filtering the ultrafine powder out of the powder preparation system.

[0157] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0158] Descriptions with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" are intended to mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0159] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-porous centrifugal turntable, comprising a turntable body (100), characterized in that: The upper surface of the turntable body (100) is provided with a first area (110) and a second area (120), wherein the first area (110) is used to receive the melt and accelerate the flow speed of the melt through rotation; and the second area (120) is provided with at least one circle of channel structures (200); The channel structure (200) surrounds the first region (110) and comprises a plurality of lattices (210) spaced apart and arranged in a circumferential direction of the first region (110), and a channel (220) for the melt to pass through is formed between two adjacent lattices (210); the second region (120) is used to stir the melt through the lattices (210) when rotating with the turntable body (100); A plurality of circles of the channel structure (200) are arranged in the second region (120), the plurality of circles of the channel structure (200) are arranged at intervals along the radial direction of the first region (110), and the channels (220) corresponding to two adjacent circles of the channel structure (200) are arranged in a staggered manner along the circumferential direction of the first region (110); A plurality of flow-guiding skeletons (230) are provided between two adjacent circles of the channel structure (200), and any one of the channels (220) of the channel structure (200) close to the first region (110) in the two adjacent circles of the channel structure (200) is connected to a plurality of channels (220) of the channel structure (200) far from the first region (110) in the two adjacent circles of the channel structure (200) through the corresponding flow-guiding skeleton (230).

2. The multi-porous centrifugal turntable according to claim 1, characterized in that: The upper surface of the turntable body (100) is further provided with a third area (130), the third area (130) surrounding the second area and comprising a flat surface portion (131).

3. The multi-porous centrifugal turntable according to claim 2, characterized in that: The third region (130) further includes an inclined portion (132) whose surface is inclined upward and outward.

4. The multi-porous centrifugal turntable according to claim 1, characterized in that: The pores (220) are of a single-layer structure.

5. The multi-porous centrifugal turntable according to claim 1, characterized in that: The hole channel (220) is a multi-layer structure stacked along the axial direction of the turntable body (100).

6. The multi-porous centrifugal turntable according to claim 1, characterized in that: The cross-sectional shape of the hole (220) is one of an ellipse, a circle, a square, and a polygon.

7. A design method for a multi-porous centrifugal turntable according to any one of claims 1 to 6, characterized in that: The following steps are involved: B1. Obtaining the flow area of ​​the melt in the first region along the flow direction as the first flow area; B2. Calculate the first pore area based on the first flow area; the first pore area is 1.5-4 times the first flow area; B3. setting the pore area of ​​all pores closest to the first region to be equal to the first pore area to obtain the pore structure closest to the first region; B11. Calculate the first flow area according to the following formula: ； in, is the first flow area, is the dynamic viscosity of the melt, is the volume flow rate of the melt, is the diameter of the first region, is the melt density of the melt, is the rotation speed of the turntable body, is the specified angle; The specified angle is calculated according to the following formula: ； in, is the preset feature size, No more than 0.5mm, is the acceleration due to gravity, is the supergravity field strength at the edge of the upper surface of the turntable body, It is the diameter of the edge of the upper surface of the turntable body.

8. The design method according to claim 7, characterized in that: The following steps are also included: C1. Obtaining the flow area of ​​the melt between two adjacent circles of the channel structure along the flow direction and using it as the second flow area; C2. Calculate the second pore area according to the second flow area; the second pore area is 1.5-2 times the second flow area; C3. setting the pore area of ​​all pores in two adjacent circles away from the first region to be equal to the second pore area, thereby obtaining a pore structure in two adjacent circles away from the first region; The specific steps in step C1 include: C11. Calculate the second flow area according to the following formula: ； in, is the second flow area of ​​the i-th, is the dynamic viscosity of the melt, is the volume flow rate of the melt, is the radius of the side of the pore structure of the i-th circle close to the first area, is the melt density of the melt, is the rotation speed of the turntable body, is the specified angle, is the total number of circles of the pore structure in the second region.

9. A powder preparation system, characterized in that: It comprises a multi-porous centrifugal turntable as described in any one of claims 1 to 6.

10. The powder preparation system according to claim 9, characterized in that: The upper surface of the turntable body (100) is further provided with a third area (130), the third area (130) comprising a flat surface portion (131) with a straight and horizontal surface and an inclined surface portion (132) with a surface inclined upward and outward; The powder preparation system further comprises an atomizing spray disc (300), the atomizing spray disc (300) being arranged above the turntable body (100) and provided with an air nozzle (310), the air nozzle (310) being used to spray an air flow toward the edge of the turntable body (100), and the air flow angle of the air nozzle (310) and the specified angle between the plane portion (131) and the inclined portion (132) satisfying the following conditions: ； ； in, is the airflow angle, Specify the angle for .

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