Method for producing a metal composite and metal composite

Abstract

This invention discloses a method for preparing a metal composite and the metal composite obtained by the method. The method for preparing the metal composite includes the following steps: providing a first metal part; depositing a metal powder layer on the first metal part; melting the metal powder layer to form a metal composite layer, wherein the metal powder layer includes a plurality of first powder blocks formed from first metal powder and a plurality of second powder blocks formed from second metal powder; depositing a second metal powder layer formed from second metal powder on the metal composite layer; melting the second metal powder layer to form a second metal layer, thereby obtaining the desired metal composite. The metal composite prepared by this method of the present invention exhibits high bonding strength between the metal composite layer and the first metal part, as well as high bonding strength between the metal composite layer and the second metal layer, resulting in high tensile strength in the metal composite of the present invention.

Description

Technical Field

[0001] This invention relates to the field of metal materials technology, and in particular to a method for preparing a metal composite and the metal composite itself. Background Technology

[0002] Due to limited internal space, electronic devices typically employ highly conductive components, such as copper, to ensure excellent conductivity. However, to save costs, external wiring is usually not made of copper. This necessitates the use of metal composite components to electrically connect the internal conductive components to the external wiring. Copper and aluminum, as two common metals with excellent conductivity, are widely used in conductive materials, and copper-aluminum composite components are increasingly becoming important conductive elements. For example, copper-aluminum composite electrodes and posts in power batteries connect to the internal copper components and external aluminum wires, respectively.

[0003] Traditional methods for manufacturing metal composites often involve surface welding, explosive bonding, or rolling bonding to produce two metals, such as copper and aluminum. This results in the formation of two metal interfaces at the junction of the two metals. The boundaries between the two interfaces are distinct, and the difference in materials between the two interfaces leads to a lower bonding strength. Consequently, the tensile strength of traditional metal composites is relatively low. Summary of the Invention

[0004] Therefore, it is necessary to provide a method for preparing metal composites that can solve the above problems.

[0005] Furthermore, it is necessary to provide a metal composite obtained by the above-mentioned method for preparing the metal composite.

[0006] A method for preparing a metal composite part includes the following steps:

[0007] Provide the first metal component;

[0008] A metal powder layer is disposed on the first metal part, and the metal powder layer is melted to form a metal composite layer. The metal powder layer includes a plurality of first powder blocks formed by first metal powder and a plurality of second powder blocks formed by second metal powder. Two adjacent first powder blocks are separated by second powder blocks or two adjacent second powder blocks are separated by first powder blocks. The materials of the first metal part and the first metal powder are both first metal or alloys containing the first metal. The materials of the second metal powder are second metal or alloys containing the second metal. The first metal and the second metal are different.

[0009] A second metal powder layer formed of the second metal powder is disposed on the metal composite layer, and the second metal powder layer is melted to form a second metal layer, thereby obtaining the desired metal composite.

[0010] In one embodiment, the method for preparing the metal composite further includes, after melting the metal powder layer to form a metal composite layer and before setting a second metal powder layer formed by the second metal powder on the metal composite layer, performing the following operation: repeating the above-described operation of setting the metal powder layer, melting the metal powder layer to form a metal composite layer at least once, to form at least two metal composite layers.

[0011] In one implementation, both the first powder block and the second powder block are multiple elongated blocks, and the first powder block and the second powder block are arranged alternately. The length directions of two first powder blocks in two adjacent metal composite layers form an angle of 0° to 90°.

[0012] In one implementation, in at least two of the metal composite layers, the area of ​​the first powder block projected onto the first metal component in the metal composite layer closer to the first metal component is not less than the area of ​​the first powder block projected onto the first metal component in the metal composite layer farther away from the first metal component.

[0013] In one implementation, the operation of melting the metal powder layer is as follows: melting the metal powder layer with a laser.

[0014] In one embodiment, the thickness of the metal powder layer is 20 μm to 60 μm, the particle size of the first metal powder is 20 μm to 50 μm, and the particle size of the second metal powder is 20 μm to 50 μm.

[0015] In one implementation, the first metal is copper and the second metal is aluminum; during the operation of melting the metal powder layer with a laser, the laser power density is 9554 W / mm² when melting the first metal powder. 2 ~14331w / mm 2 The laser scanning speed is 700 mm / s to 1000 mm / s, and the spot diameter is 0.2 mm. In the operation of melting the metal powder layer with a laser, the laser power density is 6369 W / mm² when melting the second metal powder. 2 ~11146w / mm 2 The laser scanning speed is 600mm / s to 1000mm / s, and the spot diameter is 0.2mm.

[0016] Alternatively, the first metal may be aluminum and the second metal may be copper; in the operation of melting the metal powder layer with a laser, the laser power density is 6369 W / mm² when melting the first metal powder. 2 ~11146w / mm 2 The laser scanning speed is 600 mm / s to 1000 mm / s, and the spot diameter is 0.2 mm. During the operation of melting the metal powder layer with a laser, the laser power density is 9554 W / mm² when melting the second metal powder. 2 ~14331w / mm 2 The laser scanning speed is 700mm / s to 1000mm / s, and the spot diameter is 0.2mm.

[0017] In one embodiment, the method for preparing the metal composite further includes performing the following operations after the operation of providing the first metal part and before the operation of setting a metal powder layer on the first metal part:

[0018] The first metal part is subjected to surface deoxidation treatment;

[0019] And / or, a first metal powder layer formed of the first metal powder is provided on the first metal part, and the first metal powder layer is melted to form a first metal layer.

[0020] In one embodiment, the method for preparing the metal composite further includes, after melting the second metal powder layer to form a second metal layer and before obtaining the desired metal composite, performing the following operation: repeating the above-described operation of setting the second metal powder layer formed by the second metal powder, melting the second metal powder layer to form a second metal layer at least once, and forming at least two second metal layers;

[0021] The method for preparing the metal composite further includes, after obtaining the desired metal composite, performing the following operation: annealing the metal composite.

[0022] A metal composite component, wherein the metal composite component is prepared by the above-described method for preparing metal composite components.

[0023] The method for preparing this metal composite component of the present invention involves setting a metal composite layer that connects the first metal component and the second metal layer respectively. The material of the metal composite layer includes the first metal and the second metal, thereby making the bonding strength between the metal composite layer and the first metal component, as well as the bonding strength between the metal composite layer and the second metal layer, higher than the bonding strength between the first metal component and the second metal layer directly.

[0024] Compared with traditional metal composites that directly bond two metals, the metal composite prepared by the method of the present invention has higher bonding strength between the metal composite layer and the first metal component, as well as higher bonding strength between the metal composite layer and the second metal layer, thereby resulting in higher tensile strength of the metal composite of the present invention.

[0025] Preferably, in this invention, there are at least two metal composite layers. The first powder block and the second powder block are both multiple strips, and the first powder block and the second powder block are arranged alternately. The length directions of two first powder blocks in two adjacent metal composite layers form an angle of 0° to 90°, thereby making at least two metal composite layers form an inlaid structure, which further enhances the composite strength. The strengthening effect is similar to the physical inlay connection in a chemical reaction.

[0026] Preferably, in this invention, the operation of melting the metal powder layer is as follows: melting the metal powder layer with a laser. Since the laser can reach instantaneous high temperature, compared with traditional friction welding and molecular welding processes, the thermal deformation is small and fewer intermetallic compounds are formed, thus resulting in better electrical and thermal conductivity.

[0027] The method for preparing this metal composite part of the present invention can be realized by 3D printing technology. Compared with traditional processes such as die casting and casting rolling, the process is simple, the cost is low, and it is easy to implement. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] in:

[0030] Figure 1 This is a flowchart illustrating a method for preparing a metal composite component according to one embodiment.

[0031] Figure 2 for Figure 1 The diagram shows the structure of a metal composite component prepared by the method shown.

[0032] Figure 3 for Figure 2 The diagram shows an exploded view of the metal composite component.

[0033] Figure 4The figures show the test results of tensile strength and resistance tests on the copper-aluminum composite parts prepared in Examples 1 to 6 in the test case.

[0034] Figure label:

[0035] 10. First metal component;

[0036] 20. Metal composite layer; 22. First metal pattern; 24. Second metal pattern;

[0037] 30. Second metal layer. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Combination Figure 1 , Figure 2 and Figure 3 This invention discloses a method for preparing a metal composite component according to one embodiment, comprising the following steps:

[0040] S10, Provide the first metal part 10.

[0041] Preferably, S10 further includes performing the following operations after providing the first metal part: performing a surface deoxidation treatment on the first metal part 10; and / or, providing a first metal powder layer formed of first metal powder on the first metal part 10, melting the first metal powder layer to form a first metal layer.

[0042] This operation treats the surface of the first metal part 10, resulting in a stronger bond between the first metal part 10 and the subsequently installed metal composite layer 20.

[0043] The materials of the first metal part 10 and the first metal powder are both the first metal or an alloy containing the first metal.

[0044] Preferably, in this embodiment, the operation of melting the first metal powder layer is: melting the first metal powder layer with a laser.

[0045] Because lasers can reach instantaneous high temperatures, they exhibit less thermal deformation and fewer intermetallic compounds compared to traditional friction welding and molecular welding processes, resulting in superior electrical and thermal conductivity.

[0046] More preferably, the thickness of the first metal powder layer is 20 μm to 60 μm, and the particle size of the first metal powder is 20 μm to 50 μm.

[0047] The thickness of the first metal powder layer is 20μm to 60μm, which allows the laser to penetrate effectively and enables the first metal powder layer to be well fused with the first metal part 10.

[0048] The particle size of the first metal powder is 20μm to 50μm, which allows the laser to effectively melt the first metal powder layer, resulting in a dense and uniform metal structure.

[0049] Specifically, in this embodiment, the first metal is copper, and in the operation of melting the first metal powder layer with a laser, the laser power density is 9554 W / mm². 2 ~14331w / mm 2 The laser scanning speed is 700mm / s to 1000mm / s, and the spot diameter is 0.2mm.

[0050] In particular, in this embodiment, the first metal can be pure copper or its alloy with a purity of 99.99%.

[0051] In another embodiment, the first metal is aluminum, and in the operation of melting the first metal powder layer with a laser, the laser power density is 6369 W / mm². 2 ~11146w / mm 2 The laser scanning speed is 600 mm / s to 1000 mm / s, and the spot diameter is 0.2 mm. Specifically, in this embodiment, the first metal can be pure aluminum or its alloy with a purity of 99.99%.

[0052] It should be noted that in this embodiment, the first metal component 10 is directly purchased. In other embodiments, it can also be prepared by the following method: setting a powder layer formed from the first metal powder, melting the powder layer to form a metal layer, and repeating the above operation until the total thickness of the multiple metal layers reaches a preset value. This method requires multiple operations and the steps are relatively complex.

[0053] Considering that metal powders form oxides when melted at high temperatures under aerobic conditions, affecting their electrical and thermal conductivity, and also impacting their strength—for example, copper powder will form copper or copper alloy oxides, and aluminum powder will form aluminum or aluminum alloy oxides—in this invention, unless otherwise specified, all metal powder melting operations are performed under oxygen-free conditions.

[0054] An oxygen-free condition can be a vacuum or an inert gas atmosphere, such as a helium atmosphere or a neon atmosphere.

[0055] S20. A metal powder layer is disposed on the first metal part 10, and the metal powder layer is melted to form a metal composite layer 20.

[0056] It should be noted that the shape and area of ​​the first powder block are basically the same as the shape and area of ​​the first metal pattern 22, and the shape and area of ​​the second powder block are basically the same as the shape and area of ​​the second metal pattern 24.

[0057] Combination Figure 3 In this embodiment, the area ratio of the plurality of first powder blocks to the area ratio of the plurality of second powder blocks is the same.

[0058] Preferably, in this embodiment, S20 further includes performing the following operation after melting the metal powder layer to form the metal composite layer 20: repeating the above operation of setting the metal powder layer, melting the metal powder layer to form the metal composite layer at least once, to form at least two metal composite layers 20.

[0059] Referring to the accompanying drawings, in this embodiment, the number of metal composite layers 20 is five. In other embodiments, the number of metal composite layers 20 can also be determined according to actual needs.

[0060] Generally, to ensure connection strength, the total thickness of the metal composite layer 20 needs to reach 0.1mm to 0.3mm. The specific number of metal composite layers 20 is determined by the thickness of the metal powder layer and the preset total thickness of the metal composite layer 20.

[0061] Combination Figure 3 In this embodiment, both the first powder block and the second powder block are multiple strip-shaped blocks, and the first powder block and the second powder block are arranged alternately. The length directions of the two first powder blocks in the two adjacent metal composite layers 20 form an angle of 0° to 90°.

[0062] This structural design allows at least two metal composite layers 20 to form an inlay-like structure, further enhancing the composite strength. The strengthening effect is similar to the physical inlay connection in a chemical reaction.

[0063] Specifically, referring to the accompanying drawings, in this embodiment, the length directions of the two first powder blocks in two adjacent metal composite layers 20 form an included angle of 90°.

[0064] Specifically, referring to the accompanying drawings, in this embodiment, the area and quantity of the first powder block and the second powder block are the same.

[0065] Specifically, when the length directions of the two first powder blocks in the two adjacent metal composite layers 20 form a 0° angle, the two first powder blocks in the two adjacent metal composite layers 20 are misaligned, that is, the projection of one first powder block onto the other first powder block does not coincide or partially coincides with the other first powder block.

[0066] Preferably, in other embodiments, among the at least two metal composite layers 20, the area of ​​the first powder block projected onto the first metal member 10 in the metal composite layer 20 closer to the first metal member 10 is greater than the area of ​​the first powder block projected onto the first metal member 10 in the metal composite layer 20 farther away from the first metal member 10. That is, along the direction away from the first metal member 10, the projected area of ​​the first powder block on the first metal member 10 in the at least two metal composite layers 20 gradually decreases.

[0067] This configuration can further improve the connection strength between the metal composite layer 20 and the first metal part 10 and the second metal layer 20.

[0068] Preferably, in S20, the operation of melting the metal powder layer is: melting the metal powder layer with a laser.

[0069] Because lasers can reach instantaneous high temperatures, they exhibit less thermal deformation and fewer intermetallic compounds compared to traditional friction welding and molecular welding processes, resulting in superior electrical and thermal conductivity.

[0070] It should be noted that, in order to ensure work efficiency, two laser heads can be used simultaneously to melt the first powder block and the second powder block respectively.

[0071] Preferably, in this embodiment, the thickness of the metal powder layer is 20μm to 60μm, the particle size of the first metal powder is 20μm to 50μm, and the particle size of the second metal powder is 20μm to 50μm.

[0072] The thickness of the metal powder layer is 20μm to 60μm, which allows the laser to penetrate effectively and enables the metal powder layer to be well fused with the first metal part 10.

[0073] The particle size of the first metal powder is 20μm to 50μm, and the particle size of the second metal powder is 20μm to 50μm, which allows the laser to effectively melt the first and second metal powders, resulting in a dense and uniform metal structure.

[0074] In this embodiment, the first metal is copper, and the second metal is aluminum. During the laser melting of the metal powder layer, the laser power density is 9554 W / mm² when melting the first metal powder. 2 ~14331w / mm 2 The laser scanning speed is 700 mm / s to 1000 mm / s, and the spot diameter is 0.2 mm. In the operation of melting a metal powder layer with a laser, the laser power density is 6369 W / mm² when melting the second metal powder. 2 ~11146w / mm 2 The laser scanning speed is 600mm / s to 1000mm / s, and the spot diameter is 0.2mm.

[0075] In particular, in this embodiment, the first metal can be pure copper or its alloy with a purity of 99.99%, and the second metal can be pure aluminum or its alloy with a purity of 99.99%.

[0076] In other embodiments, the first metal can be aluminum and the second metal can be copper. In this case, during the laser melting of the metal powder layer, the laser power density is 6369 W / mm² when melting the first metal powder. 2 ~11146w / mm 2 The laser scanning speed is 600 mm / s to 1000 mm / s, and the spot diameter is 0.2 mm. In the operation of melting a metal powder layer with a laser, the laser power density is 9554 W / mm² when melting the second metal powder. 2 ~14331w / mm 2 The laser scanning speed is 700mm / s to 1000mm / s, and the spot diameter is 0.2mm.

[0077] In particular, in this embodiment, the second metal can be pure copper or its alloy with a purity of 99.99%, and the first metal can be pure aluminum or its alloy with a purity of 99.99%.

[0078] S30. A second metal powder layer formed of a second metal powder is provided on the metal composite layer 20. The second metal powder layer is melted to form a second metal layer 30, thereby obtaining the desired metal composite.

[0079] Preferably, in S30, the operation of melting the second metal powder layer is: melting the second metal powder layer with a laser.

[0080] Because lasers can reach instantaneous high temperatures, they exhibit less thermal deformation and fewer intermetallic compounds compared to traditional friction welding and molecular welding processes, resulting in superior electrical and thermal conductivity.

[0081] More preferably, the thickness of the second metal powder layer is 20 μm to 60 μm. A thickness of 20 μm to 60 μm allows the laser to penetrate effectively, enabling the second metal powder layer and the metal composite layer 20 to be well fused.

[0082] Specifically, in this embodiment, the second metal is aluminum, and in the operation of melting the second metal powder layer with a laser, the laser power density is 6369 W / mm². 2 ~11146w / mm 2 The laser scanning speed is 600mm / s to 1000mm / s, and the spot diameter is 0.2mm.

[0083] In another embodiment, the second metal is copper, and in the operation of melting the second metal powder layer with a laser, the laser power density is 9554 W / mm². 2 ~14331w / mm 2 The laser scanning speed is 700mm / s to 1000mm / s, and the spot diameter is 0.2mm.

[0084] Considering that the thickness of one second metal layer 30 cannot meet the requirements, preferably, S30 further includes performing the following operation after melting the second metal powder layer to form the second metal layer and before obtaining the desired metal composite: repeating the above operation of setting the second metal powder layer formed by the second metal powder, melting the second metal powder layer to form the second metal layer at least once, and forming at least two second metal layers.

[0085] The specific number of the second metal layer 30 is determined by the thickness of the second metal powder layer and the preset total thickness of the second metal layer 30.

[0086] Preferably, S30 further includes, after obtaining the desired metal composite, performing the following operation: annealing the metal composite.

[0087] Specifically, in the annealing operation of metal composite parts, the annealing temperature is 250℃~300℃, the holding time is 4h, and the furnace cooling time is 12h~20h.

[0088] The method for preparing this metal composite component of the present invention involves setting a metal composite layer 20 to connect a first metal component 10 and a second metal layer 30 respectively. The material of the metal composite layer 20 includes a first metal and a second metal, thereby making the bonding strength between the metal composite layer 20 and the first metal component 10 and the bonding strength between the metal composite layer 20 and the second metal layer 30 higher than the bonding strength between the first metal component 10 and the second metal layer 30 directly.

[0089] Compared with traditional metal composites that directly bond two metals, the metal composites prepared by the method of the present invention have higher bonding strength between the metal composite layer 20 and the first metal part 10, as well as between the metal composite layer 20 and the second metal layer 30, resulting in higher tensile strength of the metal composites of the present invention.

[0090] The method for preparing this metal composite part of the present invention can be realized by 3D printing technology. Compared with traditional processes such as die casting and casting rolling, the process is simple, the cost is low, and it is easy to implement.

[0091] Combination Figure 2 and Figure 3The present invention also discloses a metal composite obtained by the above-described method for preparing metal composites according to one embodiment.

[0092] The following are specific implementation examples.

[0093] In the specific implementation case, the copper substrate used is pure copper with a purity of 99.99% (specification 27mm*27mm*1.7mm), the copper powder used is pure copper with a purity of 99.99%, and the aluminum powder used is pure aluminum with a purity of 99.99%.

[0094] Implementation Case 1

[0095] A method for manufacturing a copper-aluminum composite component includes the following steps:

[0096] Step 1) Copper substrate and copper powder bonding: Place the copper substrate on the 3D printing machine's worktable, spread copper powder on the copper substrate, and then perform laser melting to form a copper matrix. The copper powder particle size is 30μm, the powder layer thickness is 60μm, and the laser power density is 9554w / mm². 2 The scanning speed is 700 mm / s.

[0097] Step 2) Copper-Aluminum Bonding Surface Forming: Copper and aluminum powders are laid on the top surface of the copper substrate to form a first metal powder layer. This first metal powder layer consists of rectangular strips of copper and aluminum powder, each 0.15 mm wide, arranged in parallel and alternating patterns. Different laser heads are then used to fuse the copper and aluminum powders separately, forming a first metal composite layer. Next, copper and aluminum powders are laid on the first metal composite layer to form a second metal powder layer. This second metal powder layer consists of rectangular strips of copper and aluminum powder, each 0.15 mm wide, arranged in parallel and alternating patterns, with the included angle between the first and second copper powders being 90°. Different laser heads are then used to fuse the second copper and aluminum powders separately, forming a second metal composite layer. This process is repeated to form a third, fourth, and fifth metal composite layer, resulting in a composite material. The copper powder particle size is 30 μm, the powder layer thickness is 60 μm, and the laser power density is 9554 W / mm². 2 The scanning speed was 700 mm / s, the aluminum powder particle size was 30 μm, the powder thickness was 60 μm, and the laser power density was 6369 W / mm². 2 The scanning speed is 600 mm / s.

[0098] Step 3) Aluminum powder bonding with the composite layer: Aluminum powder is spread on the composite material, and then an aluminum layer is formed by laser melting; aluminum powder is continued to be spread, layer by layer, until the total thickness of the aluminum layer and the composite layer is 8.7 mm, resulting in a copper-aluminum composite part. The aluminum powder particle size is 30 μm, the powder layer thickness is 60 μm, and the laser power density is 6369 W / mm².2 The scanning speed is 600 mm / s.

[0099] Step 4) Annealing: Place the copper-aluminum composite part in an annealing furnace for annealing. This improves its density and yields the desired copper-aluminum composite part. The annealing temperature is 300℃, the holding time is 4 hours, and the furnace cooling time is 12 hours.

[0100] Implementation Case 2

[0101] A method for manufacturing a copper-aluminum composite component includes the following steps:

[0102] Step 1) Copper substrate and copper powder bonding: Place the copper substrate on the 3D printing machine's worktable, spread copper powder on the copper substrate, and then perform laser melting to form a copper matrix. The copper powder particle size is 30μm, the powder layer thickness is 60μm, and the laser power density is 1146w / mm². 2 The scanning speed is 750 mm / s.

[0103] Step 2) Copper-Aluminum Bonding Surface Forming: Copper powder and aluminum powder are laid on the top surface of the copper substrate to form a first metal powder layer. The first metal powder layer includes first copper powder blocks and first aluminum powder blocks, both rectangular strips with a width of 0.15 mm, arranged in parallel and alternating patterns. Then, the first copper powder blocks and first aluminum powder blocks are fused together using different laser heads to form a first metal composite layer. Next, copper powder and aluminum powder are laid on the first metal composite layer to form a second metal powder layer. The second metal powder layer includes second copper powder blocks and second aluminum powder blocks, both rectangular strips with a width of 0.15 mm, arranged in parallel and alternating patterns, with the included angle between the first copper powder blocks and the second copper powder blocks being 90°. Then, the second copper powder blocks and second aluminum powder blocks are fused together using different laser heads to form a second metal composite layer. The above operation is repeated to form a third metal composite layer, a fourth metal composite layer, and a fifth metal composite layer, thereby obtaining a composite. The copper powder has a particle size of 30 μm, a powder thickness of 60 μm, and a laser power density of 11146 W / mm². 2 The scanning speed was 750 mm / s, the aluminum powder particle size was 30 μm, the powder thickness was 60 μm, and the laser power density was 7962 W / mm². 2 The scanning speed is 650 mm / s.

[0104] Step 3) Aluminum powder bonding with the composite layer: Aluminum powder is spread on the composite (the top surface is covered with aluminum powder), and then an aluminum layer is formed by laser melting; aluminum powder is continued to be spread, layer by layer, until the total thickness of the aluminum layer and the composite layer is 8.7 mm, resulting in a copper-aluminum composite part. The aluminum powder particle size is 30 μm, the powder layer thickness is 60 μm, and the laser power density is 7962 W / mm². 2 The scanning speed is 650 mm / s and the scanning interval is 0.15 mm.

[0105] Step 4) Annealing: Place the copper-aluminum composite part in an annealing furnace for annealing. This improves its density and yields the desired copper-aluminum composite part. The annealing temperature is 300℃, the holding time is 4 hours, and the furnace cooling time is 12 hours.

[0106] Implementation Case 3

[0107] A method for manufacturing a copper-aluminum composite component includes the following steps:

[0108] Step 1) Copper substrate and copper powder bonding: Place the copper substrate on the 3D printing machine's worktable, spread copper powder on the copper substrate, and then perform laser melting to form a copper matrix. The copper powder particle size is 30μm, the powder layer thickness is 30μm, and the laser power density is 9554w / mm². 2 The scanning speed is 700 mm / s.

[0109] Step 2) Copper-Aluminum Bonding Surface Forming: Copper and aluminum powders are laid on the top surface of the copper substrate to form a first metal powder layer. This first metal powder layer consists of rectangular strips of copper and aluminum powder, each 0.15 mm wide, arranged in parallel and alternating patterns. Different laser heads are then used to fuse the copper and aluminum powders separately, forming a first metal composite layer. Next, copper and aluminum powders are laid on the first metal composite layer to form a second metal powder layer. This second metal powder layer consists of rectangular strips of copper and aluminum powder, each 0.15 mm wide, arranged in parallel and alternating patterns, with the included angle between the first and second copper powders being 90°. Different laser heads are then used to fuse the second copper and aluminum powders separately, forming a second metal composite layer. This process is repeated to form a third, fourth, and fifth metal composite layer, resulting in a composite material. The copper powder particle size is 30 μm, the powder layer thickness is 30 μm, and the laser power density is 9554 W / mm². 2 The scanning speed was 700 mm / s, the aluminum powder particle size was 30 μm, the powder thickness was 30 μm, and the laser power density was 6369 W / mm². 2 The scanning speed is 600 mm / s.

[0110] Step 3) Aluminum powder bonding with the composite layer: Aluminum powder is spread on the composite (the top surface is covered with aluminum powder), and then an aluminum layer is formed by laser melting; aluminum powder is continued to be spread, layer by layer, until the total thickness of the aluminum layer and the composite layer is 8.7 mm, resulting in a copper-aluminum composite part. The aluminum powder particle size is 30 μm, the powder layer thickness is 30 μm, and the laser power density is 6369 W / mm². 2 The scanning speed is 600 mm / s.

[0111] Step 4) Annealing: Place the copper-aluminum composite part in an annealing furnace for annealing. This improves its density and yields the desired copper-aluminum composite part. The annealing temperature is 300℃, the holding time is 4 hours, and the furnace cooling time is 12 hours.

[0112] Implementation Case 4

[0113] A method for manufacturing a copper-aluminum composite component includes the following steps:

[0114] Step 1) Copper substrate and copper powder bonding: Place the copper substrate on the 3D printing machine's worktable, spread copper powder on the copper substrate, and then perform laser melting to form a copper matrix. The copper powder particle size is 30μm, the powder layer thickness is 60μm, and the laser power density is 11146w / mm². 2 The scanning speed is 750 mm / s.

[0115] Step 2) Copper-Aluminum Bonding Surface Forming: Copper powder and aluminum powder are laid on the top surface of the copper substrate to form a first metal powder layer. The first metal powder layer includes first copper powder blocks and first aluminum powder blocks, both rectangular strips with a width of 0.15 mm, arranged in parallel and alternating patterns. Then, the first copper powder blocks and first aluminum powder blocks are fused together using different laser heads to form a first metal composite layer. Next, copper powder and aluminum powder are laid on the first metal composite layer to form a second metal powder layer. The second metal powder layer includes second copper powder blocks and second aluminum powder blocks, both rectangular strips with a width of 0.15 mm, arranged in parallel and alternating patterns, with the included angle between the first copper powder blocks and the second copper powder blocks being 90°. Then, the second copper powder blocks and second aluminum powder blocks are fused together using different laser heads to form a second metal composite layer. The above operation is repeated to form a third metal composite layer, a fourth metal composite layer, and a fifth metal composite layer, thereby obtaining a composite. The copper powder has a particle size of 30 μm, a powder thickness of 60 μm, and a laser power density of 11146 W / mm². 2 The scanning speed was 750 mm / s, the aluminum powder particle size was 30 μm, the powder thickness was 60 μm, and the laser power density was 7962 W / mm². 2 The scanning speed is 650 mm / s.

[0116] Step 3) Aluminum powder bonding with the composite layer: Aluminum powder is spread on the composite (the top surface is covered with aluminum powder), and then an aluminum layer is formed by laser melting; aluminum powder is continued to be spread, layer by layer, until the total thickness of the aluminum layer and the composite layer is 8.7 mm, resulting in a copper-aluminum composite part. The aluminum powder particle size is 30 μm, the powder layer thickness is 30 μm, and the laser power density is 7962 W / mm². 2 The scanning speed is 650 mm / s and the scanning interval is 0.15 mm.

[0117] Step 4) Annealing: Place the copper-aluminum composite part in an annealing furnace for annealing. This improves its density and yields the desired copper-aluminum composite part. The holding temperature during annealing is 250℃, the holding time is 4 hours, and the furnace cooling time is 12 hours.

[0118] Implementation Case 5

[0119] A method for manufacturing a copper-aluminum composite component includes the following steps:

[0120] Step 1) Copper substrate and copper powder bonding: Place the copper substrate on the 3D printing machine's worktable, spread copper powder on the copper substrate, and then perform laser melting to form a copper matrix. The copper powder particle size is 50μm, the powder layer thickness is 50μm, and the laser power density is 1146w / mm². 2 The scanning speed is 750 mm / s.

[0121] Step 2) Copper-Aluminum Bonding Surface Forming: Copper powder and aluminum powder are laid on the top surface of the copper substrate to form a first metal powder layer. The first metal powder layer includes first copper powder blocks and first aluminum powder blocks, both rectangular strips with a width of 0.15 mm, arranged in parallel and alternating patterns. Then, the first copper powder blocks and first aluminum powder blocks are fused together using different laser heads to form a first metal composite layer. Next, copper powder and aluminum powder are laid on the first metal composite layer to form a second metal powder layer. The second metal powder layer includes second copper powder blocks and second aluminum powder blocks, both rectangular strips with a width of 0.15 mm, arranged in parallel and alternating patterns, with the included angle between the first copper powder blocks and the second copper powder blocks being 90°. Then, the second copper powder blocks and second aluminum powder blocks are fused together using different laser heads to form a second metal composite layer. The above operation is repeated to form a third metal composite layer, a fourth metal composite layer, and a fifth metal composite layer, thereby obtaining a composite. The copper powder has a particle size of 50 μm, a powder thickness of 50 μm, and a laser power density of 11146 W / mm². 2 The scanning speed was 750 mm / s, the aluminum powder particle size was 50 μm, the powder thickness was 50 μm, and the laser power density was 7962 W / mm². 2 The scanning speed is 650 mm / s.

[0122] Step 3) Aluminum powder bonding with the composite layer: Aluminum powder is spread on the composite (the top surface is covered with aluminum powder), and then an aluminum layer is formed by laser melting; aluminum powder is continued to be spread, layer by layer, until the total thickness of the aluminum layer and the composite layer is 8.7 mm, resulting in a copper-aluminum composite part. The aluminum powder particle size is 50 μm, the powder layer thickness is 50 μm, and the laser power density is 7962 W / mm². 2 The scanning speed is 650 mm / s.

[0123] Step 4) Annealing: Place the copper-aluminum composite part in an annealing furnace for annealing. This improves its density and yields the desired copper-aluminum composite part. The annealing temperature is 300℃, the holding time is 4 hours, and the furnace cooling time is 12 hours.

[0124] Implementation Case 6

[0125] A method for manufacturing a copper-aluminum composite component includes the following steps:

[0126] Step 1) Copper substrate and copper powder bonding: Place the copper substrate on the 3D printing machine's worktable, spread copper powder on the copper substrate, and then perform laser melting to form a copper matrix. The copper powder particle size is 50μm, the powder layer thickness is 50μm, and the laser power density is 11146w / mm². 2 The scanning speed is 750 mm / s.

[0127] Step 2) Copper-Aluminum Bonding Surface Forming: Copper powder and aluminum powder are laid on the top surface of the copper substrate to form a first metal powder layer. The first metal powder layer includes first copper powder blocks and first aluminum powder blocks, both rectangular strips with a width of 0.15 mm, arranged in parallel and alternating patterns. Then, the first copper powder blocks and first aluminum powder blocks are fused together using different laser heads to form a first metal composite layer. Next, copper powder and aluminum powder are laid on the first metal composite layer to form a second metal powder layer. The second metal powder layer includes second copper powder blocks and second aluminum powder blocks, both rectangular strips with a width of 0.15 mm, arranged in parallel and alternating patterns, with the included angle between the first copper powder blocks and the second copper powder blocks being 90°. Then, the second copper powder blocks and second aluminum powder blocks are fused together using different laser heads to form a second metal composite layer. The above operation is repeated to form a third metal composite layer, a fourth metal composite layer, and a fifth metal composite layer, thereby obtaining a composite. The copper powder has a particle size of 50 μm, a powder thickness of 50 μm, and a laser power density of 11146 W / mm². 2 The scanning speed was 750 mm / s, the aluminum powder particle size was 50 μm, the powder thickness was 50 μm, and the laser power density was 7962 W / mm². 2 The scanning speed is 650 mm / s.

[0128] Step 3) Aluminum powder bonding with the composite layer: Aluminum powder is spread on the composite (the top surface is covered with aluminum powder), and then an aluminum layer is formed by laser melting; aluminum powder is continued to be spread, layer by layer, until the total thickness of the aluminum layer and the composite layer is 8.7 mm, resulting in a copper-aluminum composite part. The aluminum powder particle size is 50 μm, the powder layer thickness is 50 μm, and the laser power density is 7962 W / mm². 2 The scanning speed is 650 mm / s.

[0129] Step 4) Annealing: Place the copper-aluminum composite part in an annealing furnace for annealing. This improves its density and yields the desired copper-aluminum composite part. The holding temperature during annealing is 250℃, the holding time is 4 hours, and the furnace cooling time is 12 hours.

[0130] Test case

[0131] The copper-aluminum composite parts prepared in Examples 1 to 6 were subjected to tensile strength and electrical resistance tests, respectively. The test results are as follows: Figure 4 As shown.

[0132] Combination Figure 4 As can be seen, the copper-aluminum composite component prepared in Example 1 has a high structural density, with a tensile strength of 285 MPa and a resistance of 0.025 MΩ; the copper-aluminum composite component prepared in Example 2 has a high structural density, with a tensile strength of 356 MPa and a resistance of 0.032 MΩ; the copper-aluminum composite component prepared in Example 3 has a high structural density, with a tensile strength of 278 MPa and a resistance of 0.027 MΩ; the copper-aluminum composite component prepared in Example 4 has a high structural density, with a tensile strength of 384 MPa and a resistance of 0.011 MΩ; the copper-aluminum composite component prepared in Example 5 has a high structural density, with a tensile strength of 376 MPa and a resistance of 0.034 MΩ; and the copper-aluminum composite component prepared in Example 6 has a high structural density, with a tensile strength of 347 MPa and a resistance of 0.013 MΩ.

[0133] It can be seen that the copper-aluminum composite parts prepared in Implementation Cases 1 to 6 all meet the common standards of tensile strength ≥200MPa and electrical resistance ≤0.035MΩ.

[0134] The above-described embodiments are merely examples illustrating several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing a metal composite component, characterized in that, Includes the following steps: Provide the first metal component; A metal powder layer is disposed on the first metal component, and the metal powder layer is melted to form a metal composite layer. The metal powder layer includes a plurality of first powder blocks formed by first metal powder and a plurality of second powder blocks formed by second metal powder. Two adjacent first powder blocks are separated by second powder blocks, or two adjacent second powder blocks are separated by first powder blocks. The materials of the first metal component and the first metal powder are both a first metal or an alloy containing the first metal, and the material of the second metal powder is a second metal or an alloy containing the second metal. The first metal and the second metal are different. The operation of disposing of the metal powder layer and melting the metal powder layer to form a metal composite layer is repeated at least once to form at least two metal composite layers. A second metal powder layer formed of the second metal powder is disposed on the metal composite layer, and the second metal powder layer is melted to form a second metal layer, thereby obtaining the desired metal composite component; The first powder block and the second powder block are both multiple long strip-shaped blocks, and the first powder block and the second powder block are arranged alternately. The length directions of two first powder blocks in two adjacent metal composite layers form a 90° angle.

2. The method for preparing the metal composite component according to claim 1, characterized in that, In at least two of the metal composite layers, the area of ​​the first powder block projected onto the first metal component in the metal composite layer closer to the first metal component is not less than the area of ​​the first powder block projected onto the first metal component in the metal composite layer farther away from the first metal component.

3. The method for preparing the metal composite according to any one of claims 1 to 2, characterized in that, The operation of melting the metal powder layer is as follows: melting the metal powder layer with a laser.

4. The method for preparing the metal composite component according to claim 3, characterized in that, The thickness of the metal powder layer on the first metal part is 20μm~60μm, the particle size of the first metal powder is 20μm~50μm, and the particle size of the second metal powder is 20μm~50μm.

5. The method for preparing the metal composite component according to claim 4, characterized in that, The first metal is copper, and the second metal is aluminum; in the operation of melting the metal powder layer with a laser, the laser power density is 9554 W / mm² when melting the first metal powder. 2 ~14331w / mm 2 The laser scanning speed is 700 mm / s to 1000 mm / s, and the spot diameter is 0.2 mm. In the operation of melting the metal powder layer with a laser, the laser power density is 6369 W / mm² when melting the second metal powder. 2 ~11146w / mm 2 The laser scanning speed is 600mm / s~1000mm / s, and the spot diameter is 0.2mm; Alternatively, the first metal may be aluminum and the second metal may be copper; in the operation of melting the metal powder layer with a laser, the laser power density is 6369 W / mm² when melting the first metal powder. 2 ~11146w / mm 2 The laser scanning speed is 600 mm / s to 1000 mm / s, and the spot diameter is 0.2 mm. During the operation of melting the metal powder layer with a laser, the laser power density is 9554 W / mm² when melting the second metal powder. 2 ~14331w / mm 2 The laser scanning speed is 700mm / s~1000mm / s, and the spot diameter is 0.2mm.

6. The method for preparing the metal composite component according to claim 4, characterized in that, The method for preparing the metal composite further includes performing the following operations after the operation of providing the first metal part and before the operation of setting a metal powder layer on the first metal part: The first metal part is subjected to surface deoxidation treatment; And / or, a first metal powder layer formed of the first metal powder is provided on the first metal part, and the first metal powder layer is melted to form a first metal layer.

7. The method for preparing the metal composite according to claim 4, characterized in that, The method for preparing the metal composite further includes, after melting the second metal powder layer to form a second metal layer and before obtaining the desired metal composite, performing the following operation: repeating the above-described operation of setting the second metal powder layer formed by the second metal powder, melting the second metal powder layer to form a second metal layer at least once, and forming at least two second metal layers; The method for preparing the metal composite further includes, after obtaining the desired metal composite, performing the following operation: annealing the metal composite.

8. A metal composite component, characterized in that, The metal composite is prepared by the method for preparing metal composites according to any one of claims 1 to 7.

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