A three-period minimal surface copper-aluminum heat sink and an integrated printing method thereof

Abstract

The present application relates to a kind of three periodic minimal surface copper-aluminum heat sink and integrated printing method thereof, comprising: step S1: preparation copper alloy / graphite powder, aluminum alloy / graphite powder composite material;Step S2: design contains the heat sink model of three periodic minimal surface structure, and the heat sink model is imported into laser selective melting equipment;Step S3: using the composite material, using laser selective melting forming process is integrated to print heat sink model;Step S4: annealing treatment is carried out to the formed heat sink.The present application improves the heat dissipation efficiency and structural stability of heat sink, while improving the combination ability of the interface of copper, aluminum two materials junction, in addition, integrated printing saves the process of opening mold, and it is economic and efficient.

Description

Technical Field

[0001] This invention relates to the field of integrated printing of radiators and special precision equipment, specifically to a three-cycle minimal curved surface copper-aluminum radiator and its integrated printing method. Background Technology

[0002] Currently, electronic and electrical equipment is becoming increasingly integrated, and the heat generated per unit area of ​​heat-generating components is increasing, placing higher demands on heat sinks. If heat-generating components cannot be cooled in a timely manner, their operating temperature will rise, affecting their efficiency and even causing damage, leading to the shutdown of the entire equipment. Generally speaking, the larger the heat dissipation area of ​​a heat sink, the better its heat dissipation effect. Traditional blade-shaped heat sinks are limited by manufacturing processes, restricting the thickness and spacing of the heat dissipation blades. Too thin blades are prone to damage, and too narrow a spacing between blades increases the difficulty of mold making; current mold technology struggles to achieve a blade spacing of less than 2mm. Therefore, within a limited volume, the heat dissipation area is somewhat limited. Currently, some highly integrated components with large heat generation often require much larger heat sinks for cooling. This not only wastes space and prevents high integration but also increases the weight of the equipment, which is detrimental to the structural design of some specialized precision equipment. Therefore, researching a heat sink with greater heat dissipation capacity is of great significance.

[0003] Furthermore, the commonly used materials for heat sinks are copper and aluminum. Copper has a significantly better heat dissipation efficiency than aluminum, but the high density of copper makes the heat sink too heavy and its price too high, greatly increasing the cost. Therefore, heat sinks are often made by combining copper and aluminum, placing the copper near the heat source and using aluminum in other areas. However, this presents a problem with the interface bonding between copper and aluminum. Traditional bonding methods, due to pores and other defects, greatly affect the heat conduction between the two materials, resulting in low heat dissipation efficiency. Summary of the Invention

[0004] To address the aforementioned shortcomings, a lattice structure composed of periodically arranged minimal surfaces in space is called a three-period minimal surface structure. This structure divides space into two regions and is periodic along three coordinate axes. The three-period minimal surface structure is characterized by its light weight, high specific strength, and strong energy absorption capacity. Furthermore, compared to traditional blade radiators, it has a higher specific surface area, resulting in better heat dissipation efficiency.

[0005] This invention provides a method for integrated printing of a three-cycle minimal curved surface copper-aluminum heat sink, comprising:

[0006] Step S1: Prepare composite materials of copper alloy / graphite powder and aluminum alloy / graphite powder;

[0007] Step S2: Design a heat sink model containing a three-period minimal surface structure and import the heat sink model into a laser selective melting device;

[0008] Step S3: Using the composite material, the radiator model is integrally printed using a laser selective melting process;

[0009] Step S4: Anneal the formed heat sink.

[0010] Furthermore, a planetary ball mill was used to dry mix copper alloy and aluminum alloy powders with graphite powder to prepare two composite materials, copper alloy / graphite powder and aluminum / graphite powder, which were uniformly mixed.

[0011] The copper and aluminum alloy particles have a particle size of 10-50 μm and are spherical in shape; the graphite micro powder has a particle size of 1-10 μm.

[0012] The volume fraction of graphite powder in the two composite materials remains consistent, ranging from 1% to 5%.

[0013] The planetary ball mill is set to maintain a rotation speed of 150-300 rpm / min and a mixing time of 2-4 hours.

[0014] The three-period minimal surface structure is a Gyroid, Diamond, I-WP, or F-RD structure.

[0015] The volume fraction of the three-period minimal surface structure is set to 10-40%, and the unit cell size is set to 1-200 mm.

[0016] The integrated printing sequence is as follows: first print the copper composite material, then print the aluminum composite material.

[0017] Furthermore, during the integrated printing process, after printing the last layer of copper alloy, the laser cycles through the original path to maintain the micro-molten pool of copper alloy. After slowly lowering the preheating temperature to a temperature suitable for aluminum alloy operation, the process parameters are adjusted to continue printing aluminum alloy.

[0018] Furthermore, the process of maintaining the micro-molten pool of the copper alloy is specifically achieved by using a laser with a power of 80-100W, a scanning rate of 2000-3000mm / s, a scanning interval of 80μm, and a laser spot diameter of 100μm to cyclically scan in three directions, thereby maintaining the molten pool state of the newly printed copper alloy area.

[0019] Furthermore, during the integrated printing process, the laser scanning path rotates 60° clockwise between each layer and the previous layer.

[0020] Furthermore, the annealing time is 3-5 hours, and the heat treatment temperature is 200-300℃.

[0021] Based on the same inventive concept, the present invention provides a three-cycle minimal curved surface copper-aluminum heat sink, comprising: a copper alloy layer and an aluminum alloy layer, wherein the copper alloy layer and the aluminum alloy layer have a three-cycle minimal curved surface structure, and the copper alloy and the aluminum alloy are integrally printed using a laser selective melting forming process.

[0022] The three-period minimal surface structure is a Gyroid, Diamond, I-WP, or F-RD structure.

[0023] The copper alloy layer is composed of a composite material of copper alloy and graphite powder, and the aluminum alloy layer is composed of a composite material of aluminum alloy and graphite powder.

[0024] The copper and aluminum alloy particles have a particle size of 10-50 μm and a spherical shape; the graphite micro powder has a particle size of 1-10 μm.

[0025] The volume fraction of graphite powder in both composite materials remains consistent, ranging from 1% to 5%.

[0026] Furthermore, the copper alloy is ZCuAl11Fe3, ZCuAl19Fe4Ni4Mn2 or ZCuAl10Fe3Mn2, and the aluminum alloy is AlSi10Mg, AlSi7Mg, AlSi12 or Al6061.

[0027] Furthermore, in both composite materials, the volume fraction of graphite powder remains consistent, ranging from 1% to 5%.

[0028] Furthermore, the volume fraction of the three-period minimal surface structure is set to 10-40%, and the unit cell size is set to 1-200 mm.

[0029] Compared with the prior art, the above-mentioned technical solution of the present invention has the following main advantages:

[0030] (1) It has a larger heat dissipation area than traditional radiators of the same volume, which significantly improves heat dissipation efficiency, saves space, reduces the weight of the equipment, and combines copper and aluminum materials to balance heat dissipation performance, weight and cost. The three-cycle minimal curved surface structure is more stable than the traditional blade structure and is less prone to damage.

[0031] (2) The use of integrated printing of copper alloy and aluminum alloy materials avoids the weak interfacial bonding that occurs with traditional bonding methods, which affects thermal conductivity. Adding an appropriate amount of graphite micro powder to the copper alloy and aluminum alloy powder and adhering it to the surface of the metal particles can significantly improve the absorption of laser by the metal powder, the thermal conductivity between the powders, and the interfacial bonding ability at the interface between the two metals.

[0032] (3) Laser selective melting technology can be used to customize different structures for the heat dissipation requirements of different special precision equipment, ensuring that heat dissipation meets the requirements while saving space as much as possible. It eliminates the mold-making process, which is a suitable forming method for precision instruments with small usage but high requirements. Attached Figure Description

[0033] Figure 1 This is a flowchart of the integrated printing method for a three-cycle minimal curved surface copper-aluminum heat sink provided by the present invention.

[0034] Figure 2 This is a schematic diagram of a unit cell model of several three-period minimal surfaces provided by the present invention.

[0035] Figure 3 This is a schematic diagram of a heat sink model containing different three-period minimal surfaces provided by the present invention.

[0036] Figure 4 This is a schematic diagram of another heat sink model containing different three-period minimal surfaces provided by the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] Example 1

[0039] This invention provides an integrated printing method for a three-period minimal curved surface copper-aluminum heat sink, as shown in the attached figure. Figure 1 As shown, the method includes:

[0040] Step S1: Prepare composite materials of copper alloy / graphite powder and aluminum alloy / graphite powder;

[0041] Step S2: Design a heat sink model with a three-period minimal surface structure in the modeling software, and import the heat sink model into the laser selective melting equipment;

[0042] Step S2 specifically involves: designing different three-period minimal surface structures and unit cell sizes and volume fractions of different structures using implicit function equations in modeling software according to actual needs; arraying the three-period minimal surface structures in Magics; designing the shape of the heat sink according to requirements; dividing the copper alloy region and aluminum alloy region along the Z-axis; and finally obtaining the STL model of the designed heat sink, which is then imported into the laser selective melting equipment.

[0043] Step S3: Use laser selective melting process to print the heat sink model designed in step S2 in one piece, combining copper and aluminum.

[0044] Step S4: Anneal the formed heat sink and cut the formed structure from the substrate using a wire cutting machine.

[0045] Preferably, the copper and aluminum alloy particles used in step S1 have a particle size of 10-50 μm and a spherical shape, and the graphite micro powder has a particle size of 1-10 μm.

[0046] Preferably, the copper alloy used in step S1 is ZCuAl11Fe3, ZCuAl19Fe4Ni4Mn2 or ZCuAl10Fe3Mn2, and the aluminum alloy is AlSi10Mg, AlSi7Mg, AlSi12 or Al6061.

[0047] Preferably, in step S1, a planetary ball mill is used to dry mix copper alloy and aluminum alloy powders with graphite powder, respectively, to prepare uniformly mixed copper alloy / graphite powder and aluminum / graphite powder composite materials. The volume fraction of graphite powder in the two composite materials is kept consistent, ranging from 1% to 5%. Adding an appropriate amount of graphite powder to the copper alloy and aluminum alloy powders allows it to adhere to the surface of the metal particles, significantly improving the absorption of laser light by the copper and aluminum powders, the thermal conductivity between the powders, and the interfacial bonding ability at the interface between the two metals. However, it should be noted that if the graphite powder content is too low, the effect will be insignificant; if the content is too high, it will lead to defects in the printed structure.

[0048] Preferably, the parameters of the planetary ball mill are set to 150-300 rpm / min and the mixing time is set to 2-4 h.

[0049] Preferably, in step S2, a three-period minimal surface structure model is designed based on the implicit function equation in Matlab modeling software, as shown in the attached figure. Figure 2 As shown, the three-period minimal surface structure includes four unit cell models: Gyroid, Diamond, I-WP, and F-RD. The volume fraction of the three-period minimal surface structure is set to 10-40%. If the volume fraction is too small, the structure is fragile and easily damaged; if the volume fraction is too large, it will lead to poor airflow around the heat sink and difficulty in heat dissipation.

[0050] Preferred: The cell size is set to 1-200 mm.

[0051] The porous structure equation of the three-period minimal surface structure is as follows:

[0052] The equation for the Gyroid three-period minimal surface structure is:

[0053] F(x,y,z)=cos(x)sin(y)+cos(y)sin(z)+cos(z)sin(x)-C1 Formula (1)

[0054] The equation for the Diamond triple-periodic minimal surface is:

[0055] F(x,y,z)=sin(x)sin(y)sin(z)+sin(x)cos(y)cos(z)+cos(x)sin(y)cos(z)+cos(x)cos(y)sin(z)-C2 Formula (2)

[0056] The equation of the I-WP three-period minimum surface is:

[0057] F(x,y,z)=2[cos(x)cos(y)+cos(y)cos(z)+cos(z)cos(x)]-[cos(2x)+cos(2y)+cos(2z)]-C3 Formula (3)

[0058] The equation of the F-RD three-period minimum surface is:

[0059] F(x,y,z)=4cos(x)cos(y)cos(z)-[cos(2x)cos(2y)+cos(2x)cos(2z)+cos(2y)cos(2z)]-C4 Formula (4)

[0060] Among them, C1, C2, C3, and C4 are the porosities of four three-period curved surface structures, respectively.

[0061] Preferred method: After setting the unit cell size in step S2, the outline size of the heat sink is designed according to the actual heat dissipation requirements and equipment space. The three-period minimal surface structure model is arrayed in Magics, and a Boolean operation is performed with the designed three-period minimal surface structure to obtain the final heat sink model. Then, the three-period minimal surface structure model is divided into two regions along the Z-axis: a copper alloy region and an aluminum alloy region. Finally, the STL model of the designed heat sink is obtained and imported into the laser selective melting equipment.

[0062] Preferably, the Boolean operation is an intersection operation;

[0063] Preferably, the sequence of integrated printing in step S3 is: first print the copper composite material, then print the aluminum composite material, and the entire process is carried out under argon protection.

[0064] Preferably, in step S3, the laser scanning path is a 60° clockwise rotation of each layer compared to the previous layer.

[0065] Preferably, in step S3, the preheating temperature for printing the copper alloy is set to 250°C, and the preheating temperature for the aluminum alloy is set to 150°C. After printing the last layer of copper alloy, the preheating temperature is slowly reduced. During this period, the laser scans the original path in three directions to maintain the micro-molten pool of the copper alloy. When the temperature drops to 150°C, the copper powder feeding cylinder is replaced with the aluminum powder feeding cylinder, and the process parameters are adjusted to continue printing.

[0066] Step S3 specifically involves the following steps: For copper alloy forming, the laser power is set to 140-160W, the scanning rate to 300-500mm / s, the scanning interval to 80μm, the layer thickness to 30μm, the laser spot diameter to 100μm, and the substrate preheating temperature to 250℃. For aluminum alloy forming, the laser power is set to 100-140W, the scanning rate to 500-800mm / s, the scanning interval to 80μm, the layer thickness to 40μm, the laser spot diameter to 100μm, and the preheating temperature to 150℃. The printing scanning path rotates 60° clockwise between each layer. After printing the copper alloy area, the preheating temperature is slowly reduced, and the laser is cyclically scanned in three directions at a power of 80-100W, a scanning rate of 2000-3000mm / s, a scanning interval of 80μm, and a laser spot diameter of 100μm to maintain the molten pool state of the newly printed copper alloy area. Once the preheating temperature drops to 150℃, replace the aluminum powder feeding cylinder, adjust the process parameters, and continue printing until completion. The entire printing process is conducted under argon gas protection.

[0067] Preferably, the annealing treatment time in step S4 is 3-5 hours to eliminate residual thermal stress, which can affect the thermal conductivity and mechanical properties of the metal material. The heat treatment temperature in the annealing treatment is 200-300℃.

[0068] Example 2

[0069] Based on the same inventive concept, this invention provides an integrated printing method for a three-period minimal curved surface copper-aluminum heat sink, the method comprising the following steps:

[0070] Step A1: Select spherical ZCuAl11Fe3 and AlSi10Mg powders with a particle size of 10-50 μm, and select graphite micro powder with a particle size of 1-10 μm. Use a planetary ball mill to uniformly mix ZCuAl11Fe3 and graphite micro powder at a volume ratio of 95 / 5 to obtain 2 kg of ZCuAl11Fe3 / graphite micro powder composite powder. Set the planetary ball mill speed to 200 rpm / min and the time to 3 hours. Use a planetary ball mill to uniformly mix AlSi10Mg and graphite micro powder at a volume ratio of 95 / 5 to obtain 15 kg of AlSi10Mg / graphite micro powder composite powder. Set the planetary ball mill speed to 300 rpm / min and the time to 3 hours.

[0071] Step A2: Design the Gyroid structure in Matlab software according to the implicit function formula (1), with a unit cell size of 1.25 cm and a volume fraction of 15%, and array it into a 10×10×10 cm array. 3 A three-period minimal surface cube was constructed, and then two 11×11×0.8cm cubes were added to the top and bottom sides of the cube using Magics software. 3 Boolean operations were performed on the substrate, and then exported as an STL model. The area with a height of 0-0.8cm along the Z-axis was set as the ZCuAl11Fe3 / graphite micro powder printing area, i.e., the copper alloy area, and the area with a height of 0.8-11.6cm was set as the AlSi10Mg / graphite micro powder printing area, i.e., the aluminum alloy area.

[0072] Step A3: Import the STL file into the laser selective melting equipment. Load the ZCuAl11Fe3 / graphite micro powder composite material into the powder feeding cylinder, introduce argon gas, and raise the working chamber temperature to 250℃. Set the parameters as follows: laser power 140W, scanning rate 300mm / s, scanning interval 80μm, layer thickness 30μm, laser spot diameter 100μm, and laser scanning path rotating 60° clockwise from the previous layer. After printing to the 0.8cm area, slowly lower the preheating temperature to 150℃. During this period, the laser continues to scan the previous layer's path to maintain a micro-melt pool state. The laser scanning parameters at this time are: laser power 100W, scanning rate 2000mm / s, scanning interval 80μm, and laser spot diameter 100μm, cyclically scanning in three directions. When the preheating temperature drops to 150℃, switch to a powder feeding cylinder containing AlSi10Mg / graphite micro powder. Adjust the process parameters as follows: laser power 140W, scanning speed 500mm / s, scanning spacing 80μm, processing layer thickness 40μm, and laser spot diameter 100μm. Continue printing until completion. The one-piece formed copper-aluminum heat sink structure is shown in the attached figure. Figure 3 As shown.

[0073] Step A4: Heat-treat the printed heat sink at 400℃ for 5 hours to eliminate residual thermal stress, and then cut the formed structure off the substrate using a wire cutting machine.

[0074] Example 3

[0075] Based on the same inventive concept, this invention provides an integrated printing method for a three-period minimal curved surface copper-aluminum heat sink, which mainly includes the following steps:

[0076] Step B1: Select spherical ZCuAl19Fe4Ni4Mn and AlSi7Mg powders with a particle size of 10-50 μm, and select graphite micro powder with a particle size of 1-10 μm. Use a planetary ball mill to uniformly mix ZCuAl19Fe4Ni4Mn and graphite micro powder at a volume ratio of 99:1 to obtain 5 kg of ZCuAl19Fe4Ni4Mn / graphite micro powder composite powder. The planetary ball mill is set to a speed of 250 rpm / min for 4 hours. Use a planetary ball mill to uniformly mix AlSi7Mg and graphite micro powder at a volume ratio of 99:1 to obtain 15 kg of AlSi7Mg / graphite micro powder composite powder. The planetary ball mill is set to a speed of 350 rpm / min for 4 hours.

[0077] Step B2: Design the Diamond structure in Matlab software according to the implicit function formula (2), with a unit cell size of 1cm, a volume fraction of 20%, and an array of 10×10×5cm. 3 The three-period minimal surface cube was constructed, and then two 11×11×1cm cubes were added to the top and bottom sides of the cube using Magics software. 3 Boolean operations were performed on the substrate, and then exported as an STL model. The region with a height of 0-1cm along the Z-axis was set as the ZCuAl19Fe4Ni4Mn / graphite micro powder printing region, i.e., the copper alloy region, and the region with a height of 1-6cm was set as the AlSi7Mg / graphite micro powder printing region, i.e., the copper alloy region.

[0078] Step B3: Import the STL file into the laser selective melting equipment. Load the ZCuAl19Fe4Ni4Mn / graphite micro powder composite material into the powder feeding cylinder, introduce argon gas, and raise the working chamber temperature to 250℃. Set the parameters as follows: laser power 160W, scanning rate 500mm / s, scanning interval 80μm, layer thickness 30μm, laser spot diameter 100μm, and laser scanning path rotating 60° clockwise between each layer. After printing to a 1cm area, slowly lower the preheating temperature to 150℃. During this time, the laser continues scanning the previous layer's path to maintain a micro-melt pool state. The laser scanning parameters at this point are: laser power 80W, scanning rate 3000mm / s, scanning interval 80μm, and laser spot diameter 100μm, cyclically scanning in three directions. When the preheating temperature drops to 150℃, replace the powder feeding cylinder with one containing AlSi7Mg / graphite micro powder. Adjust the process parameters as follows: laser power 140W, scanning speed 800mm / s, scanning spacing 80μm, processing layer thickness 40μm, and laser spot diameter 100μm. Continue printing until completion. The one-piece formed copper-aluminum heat sink structure is shown in the attached figure. Figure 4 As shown.

[0079] Step B4: Heat-treat the printed heat sink at 300°C for 3 hours to eliminate residual thermal stress, and then cut the formed structure off the substrate using a wire cutting machine.

[0080] Example 4

[0081] Based on the same inventive concept, the present invention provides a three-cycle minimal curved surface copper-aluminum heat sink, comprising: a copper alloy layer and an aluminum alloy layer, wherein the copper alloy layer and the aluminum alloy layer have a three-cycle minimal curved surface structure, and the copper alloy and the aluminum alloy are integrally printed using a laser selective melting forming process.

[0082] Preferably, the three-period minimal surface structure is a Gyroid, Diamond, I-WP, or F-RD structure;

[0083] Preferably, the copper alloy layer is composed of a composite material of copper alloy / graphite powder, and the aluminum alloy layer is composed of a composite material of aluminum alloy / graphite powder.

[0084] Preferably, the copper and aluminum alloy particles have a particle size of 10-50 μm and a spherical shape; the graphite micro powder has a particle size of 1-10 μm.

[0085] Preferably, the copper alloy is ZCuAl11Fe3, ZCuAl19Fe4Ni4Mn2 or ZCuAl10Fe3Mn2, and the aluminum alloy is AlSi10Mg, AlSi7Mg, AlSi12 or Al6061.

[0086] Preferably, the volume fraction of graphite powder in the two composite materials is kept consistent, ranging from 1% to 5%. Graphite powder can improve the absorption rate of laser light by both materials. If the content of graphite powder is too low, the effect will be insignificant, and if the content is too high, it will lead to defects in the printed structure.

[0087] Preferably, the volume fraction of the three-period minimal surface structure is set to 10-40%, and the unit cell size is set to 1-200 mm. If the volume fraction is too small, the structure is fragile and easily damaged; if the volume fraction is too large, the airflow around the heat sink is poor, making heat dissipation difficult.

[0088] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for integrated printing of a three-period minimal curved surface copper-aluminum heat sink, characterized in that, include: Step S1: Prepare composite materials of copper alloy / graphite powder and aluminum alloy / graphite powder; Step S2: Design a heat sink model containing a three-period minimal surface structure and import the heat sink model into a laser selective melting device; Step S3: Using the composite material, the radiator model is integrally printed using a laser selective melting process; Step S4: Anneal the formed heat sink; Two composite materials, copper alloy / graphite powder and aluminum alloy / graphite powder, were prepared by dry mixing copper alloy and aluminum alloy powder with graphite powder using a planetary ball mill. The copper alloy and aluminum alloy particles have a particle size of 10-50 μm and are spherical in shape; the graphite micro powder has a particle size of 1-10 μm. The volume fraction of graphite powder in both composite materials remains consistent, ranging from 1% to 5%. The planetary ball mill is set to maintain a rotation speed of 150-300 rpm / min and a mixing time of 2-4 h; The three-period minimal surface structure is a Gyroid, Diamond, I-WP, or F-RD structure; The volume fraction of the three-period minimal surface structure is set to 10-40%, and the unit cell size is set to 1-200 mm. The integrated printing sequence is as follows: first print the copper alloy / graphite composite material, then print the aluminum alloy / graphite composite material. During the integrated printing process, after printing the last layer of the copper alloy / graphite, the laser cyclically scans the original path to maintain the micro-molten pool of the copper alloy. After slowly lowering the preheating temperature to a temperature suitable for aluminum alloy operation, the process parameters are adjusted to continue printing the aluminum alloy / graphite. The process of maintaining the micro-molten pool of the copper alloy is as follows: the laser is cyclically scanned in three directions with a laser power of 80-100 W, a scanning rate of 2000-3000 mm / s, a scanning interval of 80 μm, and a laser spot diameter of 100 μm to maintain the molten pool state of the newly printed copper alloy area. During the integrated printing process, the laser scanning path is such that each layer rotates 60° clockwise relative to the previous layer; The annealing process takes 3-5 hours and the heat treatment temperature is 200-300 ℃.

2. A three-cycle minimal curved surface copper-aluminum radiator using the integrated printing method for a three-cycle minimal curved surface copper-aluminum radiator as described in claim 1, characterized in that, include: The copper alloy layer and the aluminum alloy layer have a three-period minimal surface structure, and the copper alloy layer and the aluminum alloy layer are integrally printed using a laser selective melting forming process.

3. The three-period minimal curved surface copper-aluminum radiator as described in claim 2, characterized in that, The copper alloy is ZCuAl11Fe3, ZCuAl19Fe4Ni4Mn2 or ZCuAl10Fe3Mn2, and the aluminum alloy is AlSi10Mg, AlSi7Mg, AlSi12 or Al6061.

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