Additive manufacturing method of micron-sized runner and application of additive manufacturing method

Abstract

The invention relates to the technical field of additive manufacturing, in particular to an additive manufacturing method of a micron-sized runner and application of the additive manufacturing method. The additive manufacturing method for the micron-sized flow channel comprises the following steps that (a) a configuration body is split into a plurality of parallel solid cylinders based on preset distribution of the micron-sized flow channel in a target configuration, an stl model is obtained and sliced, and a slice file is obtained; (b) based on the slice file, metal powder is subjected to additive manufacturing forming through a selective laser melting process, and a target configuration with a micron-sized runner is obtained; in the step (a), the adjacent solid cylinders are tangent or intersected, and a pore defined by every four solid cylinders corresponds to a micron-sized runner. According to the additive manufacturing method, through proper micron-sized runner configuration design, under the condition that SLM equipment and technology are not changed, controllable preparation of the micron-sized runner can be achieved, and the forming precision of an extremely fine structure is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to an additive manufacturing method for a micron-level flow channel and applications thereof. Background Art

[0002] To meet the stringent material temperature requirements of next-generation hypersonic vehicle hot-end components in extreme service environments, active thermal protection technologies have become a key research focus. Among these, transpiring cooling technology, due to its excellent cooling efficiency and temperature uniformity, is widely used in key hot-end components such as combustion chambers and leading edges. However, its effective implementation places higher demands on the storage and delivery systems for the coolant, necessitating the development of functional component fabrication technologies with micron-scale, fine flow channel structures.

[0003] In the existing metal additive manufacturing technology system, selective laser melting (SLM) is regarded as the most promising solution due to its excellent forming accuracy (up to ±50μm) and complex structure forming capabilities. Current industrial-grade SLM equipment generally uses a fiber laser with a wavelength of 1070nm as an energy source. Its spot diameter is usually maintained in the range of 80-120μm due to the diffraction limit. According to the forming mechanism of powder bed melting, in order to ensure good powder laying quality and melt pool stability, the process specifications require that the metal powder particle size be controlled in the range of 15-53μm. This combination of parameters leads to significant heat accumulation effects and spheroidization phenomena in the forming process, making the minimum feature size of the actual controllable runner structure generally greater than 100μm.

[0004] This technical limitation severely restricts the application of additive manufacturing in microscale fluidic devices, particularly for transpiration cooling structures that require 10μm-level flow channel precision. Research has shown that when the flow channel diameter is less than 50μm, the coolant exhibits significant microscale flow characteristics, improving transpiration cooling efficiency by over 30%. Therefore, overcoming the resolution limitations of existing SLM technology and developing a precision forming process for 10μm-level flow channels has become a core technical challenge in the development of hypersonic vehicle thermal protection systems.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide an additive manufacturing method for micron-level flow channels and its application. The method of the present invention can achieve controllable preparation of 10μm-level microchannels through micron-level flow channel configuration design without changing SLM equipment and technology.

[0007] In order to achieve the above-mentioned object of the present invention, the first aspect of the present invention provides a method for additive manufacturing of a micron-scale flow channel, comprising the following steps:

[0008] (a) Based on the distribution of the preset micron-scale flow channels in the target configuration, the main body of the configuration is split into several parallel solid cylinders, and the STL model is obtained and sliced ​​to obtain a slice file;

[0009] (b) Based on the slicing file, additively manufacturing the metal powder through a selective laser melting process to obtain a target configuration with a micron-scale flow channel;

[0010] In step (a), adjacent solid cylinders are tangent or intersecting, and a pore surrounded by every four solid cylinders corresponds to a micron-scale flow channel.

[0011] In a specific embodiment of the present invention, the radius r of the solid cylinder is 0.25-1.5 mm. Furthermore, the radius r of each solid cylinder is the same.

[0012] In a specific embodiment of the present invention, in step (a), the distance d0 from the axis of the nearest solid cylinder satisfies

[0013] In a specific embodiment of the present invention, in the target configuration with micron-scale flow channels obtained in step (b), the theoretical diameter of the micron-scale flow channels is

[0014] In a specific embodiment of the present invention, in the target configuration having micron-scale flow channels obtained in step (b), the diameter of the micron-scale flow channels is 30 to 1240 μm.

[0015] In a specific embodiment of the present invention, the preset distribution of the micron-scale flow channels includes the diameter of the micron-scale flow channels and the number of the micron-scale flow channels.

[0016] In a specific embodiment of the present invention, the plurality of parallel solid cylinders are arranged in a matrix. Furthermore, the spacing between the axes of adjacent solid cylinders arranged horizontally is the same as the spacing between the axes of adjacent solid cylinders arranged vertically, and both are d0.

[0017] In a specific embodiment of the present invention, the particle size of the metal powder is 10 to 40 μm.

[0018] In a specific embodiment of the present invention, in the selective laser melting, a selective laser melting device with a forming accuracy of less than 100 μm is used.

[0019] In a specific embodiment of the present invention, in the selective laser melting, the powder layer thickness is ≤30 μm, and the spot diameter is ≤100 μm.

[0020] In a specific embodiment of the present invention, the metal powder includes nickel-based high-temperature alloy powder.

[0021] In a specific embodiment of the present invention, in the selective laser melting, the laser power is 180-250 W, the scanning speed is 700-1000 mm / s, and the scanning interval is 100-110 μm.

[0022] The second aspect of the present invention provides an application of the additive manufacturing method of the micron-scale flow channel according to the first aspect of the present invention in the preparation of a transpiring cooling unit.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The additive manufacturing method of the present invention, through appropriate micron-scale flow channel configuration design, enables the controllable preparation of micron-scale flow channels without changing the SLM equipment and technology, significantly improving the forming accuracy of extremely fine structures. Furthermore, the additive manufacturing method of the present invention is simple to operate and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 Schematic diagram of the design of micron-scale flow channel configurations with different diameters and numbers within a unit volume provided by an embodiment of the present invention;

[0027] Figure 2 This is a metallographic image of the side section of the micron-scale flow channel configuration obtained in Example 1 of the present invention;

[0028] Figure 3 This is a metallographic image of the side section of the micron-scale flow channel configuration obtained in Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0029] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. Those who do not specify specific conditions in the embodiments are carried out according to normal conditions or the conditions recommended by the manufacturer. Those whose reagents or instruments are not specified by the manufacturer are conventional products that can be purchased commercially.

[0030] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Research on active thermal protection structure design has shown that the effectiveness of transpiration cooling is significantly correlated with the diameter and number of fluid transport channels. When the channel diameter is less than 50 μm, the cooling fluid exhibits significant microscale flow characteristics, improving transpiration cooling efficiency by over 30%. However, due to limitations in laser control precision and powder particle size in selective laser melting, controlled forming of fine structures below 100 μm is difficult. Chinese patent application publication number CN117733180A uses selective laser melting to form a blank, then uses femtosecond laser secondary processing to create 30-50 μm micropores in the surface evaporation structure layer, but does not achieve integrated forming. Chinese patent application publication number CN112935277A increases the energy input of the laser beam to create small pores at the bottom of the laser melt pool. This unstable preparation method utilizes the gas entrainment effect at the bottom of the melt pool caused by the periodic collapse of the small pores due to their inherent instability, naturally forming pore-like micropores at the bottom of each laser cladding line. Chinese patent application publication number CN108941563A simultaneously adds chromium nitride during the SLM process to form a porous structure less than 100 μm. However, the pore size and distribution are uncontrollable, and cannot provide technical support for the design of evaporation cooling micron-scale flow channels. Therefore, the targeted controllable formation of 10 μm microchannels in selective laser melting technology is of great significance for the application and development of active thermal protection components.

[0032] Based on this, the first aspect of the present invention provides a method for additive manufacturing of a micron-scale flow channel, comprising the following steps:

[0033] (a) Based on the distribution of the preset micron-scale flow channels in the target configuration, the main body of the configuration is split into several parallel solid cylinders, and the STL model is obtained and sliced ​​to obtain a slice file;

[0034] (b) Based on the slice file, the metal powder is additively manufactured through a selective laser melting process to obtain the target configuration with micron-scale flow channels;

[0035] In step (a), adjacent solid cylinders are tangent or intersecting, and a pore surrounded by every four solid cylinders corresponds to a micron-scale flow channel.

[0036] Among them, the target configuration refers to a structure containing a distribution of preset micron-level flow channels within a configuration body with a certain structure. The structure of the configuration body is not limited, and can be a regular structure or an irregular special-shaped structure, such as a cube, sphere, cylinder, cone, prism, regular polyhedron, torus, etc., but is not limited to it. The structure of the specific configuration body can be adjusted and selected according to the three-dimensional figure required by the target configuration. The additive manufacturing method of the present invention can achieve controllable preparation of micron-level flow channels without changing the SLM equipment and technology through appropriate micron-level flow channel configuration design, thereby significantly improving the forming accuracy of extremely fine structures. In addition, the additive manufacturing method of the present invention is simple to operate and easy to implement.

[0037] In a specific embodiment of the present invention, the radius r of the solid cylinder is 0.25 to 1.5 mm. For example, in different embodiments, the radius r of the solid cylinder can be 0.25 mm, 0.5 mm, 0.75 mm, 1 mm, 1.2 mm, 1.5 mm, or any rational value within the range of 0.25 to 1.5 mm that can be recognized by the three-dimensional modeling software. The larger the value of the radius r of the solid cylinder, the fewer the number of micron-scale flow channels in the same volume. Figure 1 In (a) to (c), within the same volume, as the radius of the solid cylinder decreases, the number of micron-scale flow channels increases. Controlling the radius r within this range ensures the precision of the solid cylinder during selective laser melting while maintaining a sufficient number of micron-scale flow channels within the same volume to meet the practical application requirements of the transpiration cooling unit.

[0038] In practice, the main structure of the configuration can be modeled using software such as UG. Then, based on the distribution of the preset micron-level flow channels in the target configuration, the main structure of the configuration can be split into several parallel solid cylinders and exported as an STL format file. The STL format file can then be imported into software such as Materialise Magics for slicing to obtain a slice file.

[0039] In a specific embodiment of the present invention, the radius r of each solid cylinder is the same.

[0040] In a specific embodiment of the present invention, in step (a), the distance d0 from the axis of the nearest solid cylinder satisfies The distance d0 from the axis of the nearest solid cylinder can be any rational value that satisfies the above conditions and has an accuracy that can be recognized by the 3D modeling software. The smaller the value of d0 within the specified range, the smaller the micron-scale flow channel diameter; when When d0>2r, all solid cylinders are separated and all micron-level flow channels are connected, so there is no actual meaning of "flow channel". For the case of d0=2r, the closest solid cylinders are all tangent to each other, such as Figure 1 As shown in (d), the diameter of the micron-scale flow channel reaches its maximum value, and the micron-scale flow channels are still independent and not connected to each other.

[0041] In a specific embodiment of the present invention, in the target configuration with micron-scale flow channels obtained in step (b), the theoretical diameter of the micron-scale flow channels is Theoretically, the diameter of the micron-scale flow channel can include any size range from 0 to 1240 μm. However, due to the limitations of powder particle size and the precision of the equipment forming control, the diameter of the micron-scale flow channel that can be actually formed is any size range from 30 to 1240 μm. That is, in the target configuration with micron-scale flow channels obtained in step (b), the diameter of the micron-scale flow channel is 30 to 1240 μm.

[0042] For example, in various embodiments, the diameter of the micron-scale flow channels obtained by the method of the present invention can be 30 μm, 40 μm, 50 μm, 60 μm, 80 μm, 100 μm, or a range consisting of any two thereof. Furthermore, in the target configuration of micron-scale flow channels obtained by the method of the present invention, the length of the micron-scale flow channels is ≥ 10 mm, and the length of the micron-scale flow channels exceeding 10 mm in the flow channel length direction is free of powder residue and blockage, and the flow channel connectivity is good.

[0043] It is understandable that, since the micron-scale flow channel generated by the solid cylindrical spaced-space model does not have a regular geometric shape, the diameter of the micron-scale flow channel of the present invention is the geometrically equivalent diameter of the micron-scale flow channel cross section.

[0044] In a specific embodiment of the present invention, the additive manufacturing method of the micron-scale flow channel includes the following steps:

[0045] (a) Based on the distribution of the preset micron-scale flow channels in the target configuration, the main body of the configuration is divided into several parallel solid cylinders with a radius r of 0.25 to 1.5 mm. Adjacent solid cylinders are tangent or intersecting, and the distance d0 between the axes of the closest solid cylinders satisfies Get the stl model and slice it to get the slice file;

[0046] (b) Based on the slice file, the metal powder is additively manufactured by selective laser melting process to obtain a material with a theoretical diameter of The target configuration of the micron-scale flow channel.

[0047] In a specific embodiment of the present invention, the preset distribution of the micron-scale flow channels includes the diameter of the micron-scale flow channels and the number of the micron-scale flow channels.

[0048] Based on the varying demands for cooling medium transport within micron-scale channels for thermal protection, the target configuration requires the diameter and / or number of micron-scale channels to meet certain requirements. Based on these requirements, the main body of the configuration is split into several parallel solid cylinders, so that the cylinders enclose micron-scale channels within the main body of the configuration with diameters and numbers that meet the pre-set requirements.

[0049] In a specific embodiment of the present invention, a plurality of mutually parallel solid cylinders are arranged in a matrix. Furthermore, the spacing between the axes of adjacent solid cylinders arranged horizontally is the same as the spacing between the axes of adjacent solid cylinders arranged vertically.

[0050] In a specific embodiment of the present invention, the particle size of the metal powder is 10 to 40 μm, for example, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, or any combination thereof. In actual operation, the metal powder is conventionally dried before additive manufacturing.

[0051] In a specific embodiment of the present invention, the particle size of the metal powder does not exceed the preset diameter of the micron-level flow channel, thereby ensuring the powder cleaning operation of the formed component.

[0052] In a specific embodiment of the present invention, the type of metal powder is not limited, and any metal material powder that can be used for additive manufacturing can be used, examples of which may include but are not limited to any one of stainless steel powder, aluminum alloy, titanium alloy, nickel-based high-temperature alloy, and refractory alloy.

[0053] In a specific embodiment of the present invention, selective laser melting is performed using a selective laser melting device with a forming accuracy of less than 100 μm. This method has no requirements for the type of selective laser melting device, as long as its forming accuracy meets the above conditions.

[0054] In a specific embodiment of the present invention, in selective laser melting, the powder layer thickness is ≤30μm, for example, it can be 30μm, 25μm, 25μm, 20μm, 15μm, 10μm, etc. There is no specific restriction on the lower limit of the powder layer thickness, and the limit allowed by the equipment can be reached; the spot diameter is ≤100μm, for example, it can be 100μm, 90μm, 80μm, 70μm, 60μm, 50μm, etc. There is no specific restriction on the lower limit of the spot diameter, and the limit allowed by the equipment can be reached.

[0055] The method of the present invention provides a method for designing micron-scale flow channel configurations. It places no specific restrictions on the metal material or specific SLM process used to form these micron-scale flow channel configurations. Within the present method for designing micron-scale flow channel configurations, the metal material type is selected based on the application requirements. Given the metal material type, conventional control schemes for laser power, scanning speed, scanning spacing, and other parameters during the SLM process remain within the scope of protection of the present invention.

[0056] In a specific embodiment of the present invention, the metal powder includes nickel-based high-temperature alloy powder, such as but not limited to Inconel 718 powder.

[0057] In a specific embodiment of the present invention, during selective laser melting, the powder layer thickness is 20-30 μm, the spot diameter is 80-100 μm, and further, during selective laser melting, the laser power is 180-250 W, the scanning speed is 700-1000 mm / s, and the scanning pitch is 100-110 μm.

[0058] Among them, the laser power includes but is not limited to 180W, 200W, 210W, 230W, 250W or a range consisting of any two thereof; the scanning speed includes but is not limited to 700mm / s, 800mm / s, 900mm / s, 1000mm / s or a range consisting of any two thereof; the scanning spacing includes but is not limited to 100μm, 102μm, 105μm, 108μm, 110μm or a range consisting of any two thereof.

[0059] The second aspect of the present invention provides an application of the additive manufacturing method of the micron-scale flow channel according to the first aspect of the present invention in the preparation of a transpiring cooling unit.

[0060] Specifically, the configuration body can be split according to the specific requirements of the application site of the transpiration cooling unit for the diameter and number of the micron-level flow channels to obtain a transpiration cooling unit with micron-level flow channels that meet the requirements.

[0061] It can be understood that the sweating cooling unit is only one target configuration that can be achieved by the additive manufacturing method of the micron-level flow channel of the present invention. The other structures that require the arrangement of micron-level flow channels in the configuration body can also be obtained according to the additive manufacturing method of the present invention, and will not be elaborated here.

[0062] In the following embodiments, a cube is used as an example of the configuration body, but it can be understood that the cube is used as the configuration body for illustration only, and the structure of the configuration body is not limited thereto, and can be adjusted and selected according to the three-dimensional figure required by the target configuration.

[0063] Example 1

[0064] This embodiment provides a method for additive manufacturing of micron-scale flow channels, comprising the following steps:

[0065] (1) The main structure of the configuration was modeled using UG software. The main structure was split into several parallel solid cylinders arranged in a matrix. The radius r of the solid cylinder was 1.5 mm, and the spacing d0 between the axes of adjacent solid cylinders in the horizontal direction and adjacent solid cylinders in the vertical direction was set to 2.18 mm (the splitting method refers to Figure 1 After modeling is completed, export the stl file. Import the stl file into Materialise Magics for slicing and export it as an SLM file.

[0066] (2) The Inconel 718 alloy powder prepared by vacuum induction atomization was screened into a particle size range of 10-40 μm, dried at 75 °C for 6 h, and then added to the selective laser melting equipment SLM Solutions SLM125. The selective laser melting forming process parameters were set as follows: powder layer thickness 30 μm, spot diameter 80 μm, laser power 210 W, scanning speed 800 mm / s, and scanning spacing 110 μm; the SLM format file was imported into the above-mentioned selective laser melting equipment for additive manufacturing to obtain the target configuration with micron-level flow channels.

[0067] Example 2

[0068] This embodiment refers to the additive manufacturing method of the micron-level flow channel of Embodiment 1, with the only difference being that in step (1), the radius r of the solid cylinder and the spacing d0 between the axes of adjacent solid cylinders have different values.

[0069] In step (1) of this embodiment, the radius r of the solid cylinder is set to 1 mm, and the distance d0 between the axes of adjacent solid cylinders is set to 1.45 mm.

[0070] Example 3

[0071] This embodiment refers to the additive manufacturing method of the micron-level flow channel of Embodiment 1, with the only difference being that in step (1), the radius r of the solid cylinder and the spacing d0 between the axes of adjacent solid cylinders have different values.

[0072] In step (1) of this embodiment, the radius r of the solid cylinder is set to 0.5 mm, and the distance d0 between the axes of adjacent solid cylinders is set to 0.73 mm.

[0073] Example 4

[0074] This embodiment refers to the additive manufacturing method of the micron-level flow channel of Embodiment 1, with the only difference being that in step (1), the radius r of the solid cylinder and the spacing d0 between the axes of adjacent solid cylinders have different values.

[0075] In step (1) of this embodiment, the radius r of the solid cylinder is set to 0.25 mm, and the distance d0 between the axes of adjacent solid cylinders is set to 0.39 mm.

[0076] Comparative Example 1

[0077] Comparative Example 1 refers to the additive manufacturing method of the micron-scale flow channel of Example 1, except that: step (1) is different.

[0078] Step (1) of comparative example 1 includes: modeling the main structure of the configuration using UG software, and then directly punching holes, setting the hole diameter to 80 μm, and each hole is arranged in a matrix, and the rows and columns formed by the holes intersect at right angles, and the center distance between adjacent holes is 3 mm. After the modeling is completed, the stl format file is exported, and the stl format file is imported into the Materialise Magics software for slicing.

[0079] Comparative Example 2

[0080] Comparative Example 2 refers to the additive manufacturing method of the micron-scale flow channel of Example 1, except that: step (1) is different.

[0081] Step (1) of comparative example 2 includes: modeling the main structure of the configuration using UG software, and then directly punching holes, setting the hole diameter to 50 μm, and each hole is arranged in a matrix, and the rows and columns formed by the holes intersect at right angles, and the center distance between adjacent holes is 2 mm. After the modeling is completed, the stl format file is exported, and the stl format file is imported into the Materialise Magics software for slicing.

[0082] Comparative Example 3

[0083] Comparative Example 3 refers to the additive manufacturing method of the micron-scale flow channel of Example 1, except that: step (1) is different.

[0084] Step (1) of comparative example 3 includes: modeling the main structure of the configuration using UG software, and then directly drilling holes, setting the hole diameter to 30 μm, and each hole is arranged in a matrix, and the rows and columns formed by the holes intersect at right angles, and the center distance between adjacent holes is 1 mm. After the modeling is completed, the stl format file is exported, and the stl format file is imported into the Materialise Magics software for slicing.

[0085] Comparative Example 4

[0086] Comparative Example 4 refers to the additive manufacturing method of the micron-scale flow channel of Example 1, except that: step (1) is different.

[0087] Step (1) of comparative example 4 includes: modeling the main structure of the configuration using UG software, and then directly punching holes, setting the hole diameter to 50 μm, and each hole is arranged in a matrix, and the rows and columns formed by the holes intersect at right angles, and the center distance between adjacent holes is 0.5 mm. After the modeling is completed, the stl format file is exported, and the stl format file is imported into the Materialise Magics software for slicing.

[0088] Experimental example

[0089] Samples of the target micron-scale flow channel configurations obtained in various examples and comparative examples were subjected to wire-spark electrospark cutting (WEEK) to obtain side cross-sections of the micron-scale flow channels. The samples were then sanded until the widest part of the micron-scale flow channel was exposed, polished, and observed using an optical microscope. Image J software was used to calculate the average diameter (measured diameter) of the micron-scale flow channels formed in each example and comparative example. The test results are shown in Table 1. Figure 2 and Figure 3 They are side cross-sectional metallographic images of the micron-scale flow channel configurations of Example 1 of the present invention and Comparative Example 1, respectively.

[0090] Table 1 Micron-scale flow channel states formed in different embodiments and comparative examples

[0091]

[0092] A water flow test was conducted on the micron-level flow channel configuration of the embodiment of the present invention, which showed that the pressure of each micron-level flow channel was average and the flow rate was stable. From the above test results, it can be seen that the additive manufacturing method of the micron-level flow channel of the present invention can significantly improve the forming stability of the ten-micron-level flow channel compared to the method of the comparative example, and ensure the practicality of the ten-micron-level flow channel in the sweating and cooling function. The method of the present invention successfully achieved the controllable preparation of the ten-micron-level flow channel without changing the conditions and forming parameters of the selective laser melting equipment, and has broad application prospects and scientific research value.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for additive manufacturing of micron-scale flow channels, characterized in that: The steps include: (a) Based on the distribution of micron-scale flow channels preset in the target configuration, the main body of the configuration is split into several parallel solid cylinders, and the STL model is obtained and sliced ​​to obtain a slice file; (b) Based on the slicing file, additively manufacturing the metal powder through a selective laser melting process to obtain a target configuration with micron-scale flow channels; In step (a), adjacent solid cylinders are tangent or intersecting, and a pore surrounded by every four solid cylinders corresponds to a micron-scale flow channel.

2. The additive manufacturing method for micron-scale flow channels according to claim 1, characterized in that: The radius r of the solid cylinder is 0.25 to 1.5 mm; Preferably, the radius r of each of the solid cylinders is the same.

3. The additive manufacturing method for micron-scale flow channels according to claim 1, characterized in that: In step (a), the distance d0 from the axis of the nearest solid cylinder satisfies 4. The additive manufacturing method for micron-scale flow channels according to claim 1, characterized in that: In the target configuration with micron-scale flow channels obtained in step (b), the theoretical diameter of the micron-scale flow channels is Preferably, in the target configuration having micron-scale flow channels obtained in step (b), the diameter of the micron-scale flow channels is 30 to 1240 μm.

5. The additive manufacturing method for micron-scale flow channels according to claim 1, characterized in that: The preset distribution of the micron-scale flow channels includes the diameter of the micron-scale flow channels and the number of the micron-scale flow channels.

6. The additive manufacturing method for micron-scale flow channels according to claim 1, characterized in that: The plurality of mutually parallel solid cylinders are arranged in a matrix; Preferably, the spacing between the axes of adjacent solid cylinders arranged in a transverse direction is the same as the spacing between the axes of adjacent solid cylinders arranged in a longitudinal direction.

7. The additive manufacturing method for micron-scale flow channels according to claim 1, characterized in that: The particle size of the metal powder is 10 to 40 μm.

8. The additive manufacturing method for micron-scale flow channels according to claim 1, characterized in that: The selective laser melting has at least one of the following characteristics: (1) Use selective laser melting equipment with a forming accuracy of less than 100 μm; (2) Powder layer thickness ≤ 30 μm; (3) Spot diameter ≤ 100 μm.

9. The additive manufacturing method for micron-scale flow channels according to claim 1, characterized in that: The metal powder includes nickel-based high-temperature alloy powder; Preferably, in the selective laser melting, the laser power is 180-250 W, the scanning speed is 700-1000 mm / s, and the scanning spacing is 100-110 μm.

10. Use of the additive manufacturing method of the micron-scale flow channel according to any one of claims 1 to 9 in the preparation of a sweating cooling unit.

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