A method for regulating the copper / molybdenum / copper interface and preparing layered composite materials

Abstract

This invention provides a method for controlling the copper / molybdenum / copper interface and preparing layered composite materials, belonging to the field of layered composite material processing technology. The method includes: using laser processing to perform single-sided and double-sided fixed-angle micro-tooth processing on pretreated copper and molybdenum plates, with the following laser processing conditions: cutting power of 300~600 W, cutting speed of 2~5 mm / min, and cutting pressure of 0.5~1.0 MPa; using sandblasting technology to perform micro-plastic deformation on the micro-tooth surfaces of the copper and molybdenum plates, with the following sandblasting conditions: sandblasting pressure range of 0.3~0.9 MPa and sandblasting time of 1~5 min; performing DC-assisted hot-pressing diffusion bonding on the surface-treated copper and molybdenum plates to obtain a copper / molybdenum / copper layered composite plate; and subjecting the obtained copper / molybdenum / copper layered composite plate to high-energy electrical pulse treatment. This invention employs an integrated molding technology combining surface structure design and current-assisted preparation, designing a macroscopic meshing mechanical connection combined with a microscopic metallurgical diffusion, achieving a reliable connection at the copper / molybdenum interface.

Description

Technical Field

[0001] This invention relates to the field of layered composite material processing technology, specifically to copper / molybdenum / copper interface control and methods for preparing layered composite materials. Background Technology

[0002] With the continuous development of electronic packaging technology, high heat flux density places higher demands on chip heat dissipation, making the selection of heat dissipation materials with superior performance a research hotspot. Molybdenum-copper (MoCu) alloys and their composites have attracted widespread attention due to their combination of low coefficient of thermal expansion and high thermal conductivity. Copper / molybdenum / copper multilayer metal heat sinks are high-performance layered composite materials specifically designed for the electronic packaging field. They combine the high thermal conductivity of copper with the low coefficient of thermal expansion of molybdenum, and their coefficient of thermal expansion is adjustable, making them widely applicable.

[0003] Molybdenum and copper have significantly different physical and chemical properties, and traditional joining methods such as infiltration, mechanical joining, and welding suffer from insufficient bond strength, complex processes, and high costs. In recent years, DC-assisted thermo-pressure diffusion joining, as an emerging green and efficient joining technology, has attracted widespread attention from researchers due to its ease of operation, low cost, and ability to achieve good interfacial bonding. However, improving the interfacial metallurgical bonding of copper and molybdenum, which are non-solid-dissolved metals, remains a challenge. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention proposes a method for regulating the copper / molybdenum / copper interface and preparing layered composite materials. It employs an integrated molding technology combining surface treatment and current-assisted fabrication, and designs a combination of macroscopic meshing mechanical connections and microscopic metallurgical diffusion to achieve reliable connection of the copper / molybdenum interface, thereby improving the overall performance of the copper / molybdenum / copper layered composite materials.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a method for regulating the copper / molybdenum / copper interface and preparing layered composite materials, comprising the following steps:

[0007] Step 1: Laser processing is used to perform single-sided and double-sided fixed-angle micro-tooth processing on the pre-treated copper and molybdenum plates respectively. The laser processing conditions are as follows: cutting power is 300~600 W, cutting speed is 2~5 mm / min, and cutting pressure is 0.5~1.0 MPa.

[0008] Step 2: The micro-toothed surfaces of the copper and molybdenum plates obtained in Step 1 are subjected to micro-plastic deformation using sandblasting technology. The sandblasting process conditions are as follows: sandblasting pressure range is 0.3~0.9 MPa, and sandblasting time is 1~5 min.

[0009] Step 3: Perform DC-assisted hot pressing diffusion bonding on the copper plate and molybdenum plate after surface treatment in Step 2 to obtain a copper / molybdenum / copper layered composite plate. The hot pressing process conditions are as follows: hot pressing diffusion bonding pressure is 20~40 MPa, temperature is 700~900 ℃, holding time is 20~60 min, and overall deformation is 2%~5%.

[0010] Step 4: Perform high-energy electrical pulse treatment on the copper / molybdenum / copper layered composite plate obtained in Step 3. The electrical pulse process conditions are as follows: pulse voltage is 30~50V, pulse frequency is 120~180Hz, and pulse time is 10~30s.

[0011] As a further explanation of the present invention, in step 1, the pretreatment process of the copper plate and the molybdenum plate is as follows: the copper plate and the molybdenum plate are polished in sequence using sandpaper of 80#, 400#, 600#, 800#, 1000#, 1500# and 2000#, and then ultrasonically cleaned in anhydrous ethanol to remove impurities from the surface of the plates. After removal, the surface is dried.

[0012] As a further explanation of the present invention, the protective gas in the laser processing in step 1 is nitrogen.

[0013] As a further explanation of the present invention, the laser processing in step 1 also includes the following process conditions: the cutting angle θ is 30°~45°, where θ is the angle between the short side of the micro-tooth and the root of the tooth groove; the cutting angle ε is 165°~150°, where ε is the angle between the long side of the micro-tooth and the root of the tooth groove, θ>180°-ε, the length a of the long tooth side is 0.6~1.54 mm, and the tooth groove width l is 1.5~3 mm.

[0014] As a further explanation of the present invention, in step 2, 100-250 mesh SiO2 quartz sand is used for sandblasting.

[0015] As a further explanation of the present invention, in step 2, after sandblasting, anhydrous ethanol is used for ultrasonic cleaning to remove residual sandblasting particles from the surface.

[0016] As a further explanation of the present invention, in step 3, a DC-assisted hot-press diffusion furnace is used to hot-press and diffuse the copper plate and the molybdenum plate together.

[0017] As a further explanation of the present invention, in step 3, during the hot-press diffusion bonding process, the vacuum level inside the DC-assisted hot-press diffusion furnace is 10. -3 Pa.

[0018] As a further explanation of the present invention, in step 3, when performing hot-press diffusion bonding, the direction of the applied current is perpendicular to the copper / molybdenum / copper layered composite plate.

[0019] As a further explanation of the present invention, the preparation method further includes: ultrasonically cleaning the copper / molybdenum / copper layered composite plate after high-energy electrical pulse treatment in anhydrous ethanol to remove impurities on the plate surface, and then drying the plate surface to obtain a high-performance copper / molybdenum / copper layered composite material with high interfacial bonding.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] This invention first uses laser to pre-define oriented micro-teeth on molybdenum and copper plates to achieve interfacial meshing. Further, the oriented micro-teeth undergo surface micro-plastic deformation to increase interfacial gradient defects, providing channels for the rapid diffusion of copper and molybdenum atoms. Even further, a DC-assisted hot-press diffusion furnace is used to micro-deform the copper / molybdenum composite material with the micro-teeth structure, eliminating voids between the copper / molybdenum micro-teeth while achieving efficient diffusion of copper and molybdenum atoms, thus realizing interfacial metallurgical bonding. Finally, a high-energy pulsed current is used to briefly treat the copper / molybdenum layered composite material, further increasing the diffusion of copper and molybdenum atoms and the thickness of the metallurgical diffusion layer, promoting recrystallization of the micro-deformed surface, and achieving highly reliable bonding of the copper / molybdenum interface. Ultimately, this results in the efficient preparation of a copper / molybdenum / copper layered composite material with excellent comprehensive performance.

[0022] Other features and advantages of this technical solution will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the technical solution. The objectives and other advantages of this technical solution can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0023] The technical solution of this invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the present technical solution and form part of the specification. They are used together with the embodiments of the present technical solution to explain the present technical solution, but do not constitute a limitation thereof. In the accompanying drawings:

[0025] Figure 1 The flowchart of the method for regulating the copper / molybdenum / copper interface and preparing layered composite materials provided by the present invention is shown below.

[0026] Figure 2 A schematic diagram of the serrated interface structure of the copper / molybdenum / copper layered composite material provided by the present invention;

[0027] Figure 3 The microstructure of the interface of the copper / molybdenum / copper layered composite material prepared in Example 3 of this invention. Detailed Implementation

[0028] The preferred embodiments of this technical solution are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for illustration and explanation of this technical solution and are not intended to limit this technical solution.

[0029] like Figure 1 As shown, this embodiment of the invention provides a method for regulating the copper / molybdenum / copper interface and preparing layered composite materials, including the following steps:

[0030] Step 1: Raw material preparation: Select flat copper and molybdenum plates with dimensions of 30×40×1 mm. Grind and polish them in sequence using sandpaper of 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000#. Then, ultrasonically clean them with anhydrous ethanol for 30 minutes to remove impurities from the surface of the plates. Take them out and dry their surfaces.

[0031] Step 2: Surface micro-tooth machining: Laser processing is used to perform single-sided and double-sided fixed-angle micro-tooth machining on copper and molybdenum plates respectively. The laser processing conditions are as follows: cutting power 300~600 W, cutting speed 2~5 mm / min, protective gas nitrogen, cutting pressure 0.5~1.0 MPa, cutting angle θ (θ is the angle between the short side of the micro-tooth and the root of the tooth groove) 30°~45°, cutting angle ε (ε is the angle between the long side of the micro-tooth and the root of the tooth groove) 165°~150°, θ>180°-ε, long tooth side length a 0.6~1.54 mm, tooth groove width l 1.5~3 mm.

[0032] It should be noted that: in step 2, the cutting power can be selected from 300 W, 350 W, 400 W, 450 W, 500 W, 500 W, 600 W, etc.; the cutting speed can be selected from 2 mm / min, 2.5 mm / min, 3 mm / min, 3.5 mm / min, 4 mm / min, 5 mm / min, etc.; the cutting pressure can be selected from 0.5 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1.0 MPa, etc.; the cutting angle θ can be selected from 30°, 35°, 40°, 45°, etc.; the cutting angle ε can be selected from 165°, 160°, 155°, 150°, etc.; the length of the long tooth edge a can be selected from 0.6 mm, 0.8 mm, 1 mm, 1.1 mm, 1.2 mm, 1.4 mm, 1.54 mm, etc.; and the tooth groove width l can be selected from 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0033] The surface micro-tooth processing technology in this invention plays a crucial role in two main aspects: First, one function of the micro-tooths is mechanical engagement. The micro-tooth angle designed in this invention achieves both mechanical connection and expanded connection area at the copper / molybdenum interface. This angle provides a high thermal resistance interface for subsequent current-assisted fabrication and processing, promoting interfacial metallurgical bonding. If both θ and ε are 90°, the micro-tooths only increase the contact area at the copper / molybdenum interface, and their angle is parallel to the subsequent current direction, failing to achieve further diffusion and metallurgical bonding on the parallel contact surface. Therefore, the design of the angle is critical. Second, the micro-tooth angle designed in this invention is closely related to the current-assisted thermo-pressing bonding and electrical pulse processing in steps 4 and 5. The designed θ and ε play a decisive role in the magnitude of the component force of the electron wind at the copper / molybdenum interface, maximizing the thermo-pressing bonding and electrical pulse processing effects. If both θ and ε are 90°, the component force of the electron wind perpendicular to the copper / molybdenum interface reaches its minimum, failing to play its due role, resulting in incomplete interfacial metallurgical bonding.

[0034] Step 3: Surface treatment: The micro-tooth surface is micro-plastically deformed using sandblasting technology. The sandblasting process conditions are as follows: 100-250 mesh SiO2 quartz sand with a pressure range of 0.3-0.9 MPa and a sandblasting time of 1-5 min; use anhydrous ethanol for 5-10 ultrasonic cleaning cycles for 30 min to remove residual quartz sand particles from the metal surface.

[0035] It should be noted that: in step 3, the SiO2 quartz sand can be selected from 100 mesh, 150 mesh, 200 mesh, 250 mesh, etc.; the sandblasting pressure range can be selected from 0.3MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8MPa, 0.9 MPa, etc.; and the sandblasting time can be selected from 1 min, 2 min, 3 min, 4 min, 5 min, etc.

[0036] Step 4: Hot-press bonding: The surface-treated copper / molybdenum plates are hot-pressed and diffused together using a DC-assisted hot-press diffusion furnace. The hot-press diffusion process conditions are as follows: vacuum degree is 10... -3 The hot-press diffusion bonding pressure is 20~40MPa, the temperature is 700~900℃, the holding time is 20~60 min, and the overall deformation is 2%~5%. The applied current direction is perpendicular to the copper / molybdenum plate.

[0037] It should be noted that: the pressure of the hot-press diffusion bonding treatment in step 4 can be selected from 20MPa, 25MPa, 30MPa, 35MPa, 40MPa, etc.; the temperature can be selected from 700℃, 750℃, 800℃, 850℃, 900℃, etc.; the heat preservation and pressure holding time can be selected from 20min, 25min, 30min, 35min, 40min, 45min, 50min, 55min, 60min, etc.; and the overall deformation can be selected from 2%, 3%, 4%, 5%, etc.

[0038] Step 5: Electrical pulse treatment: High-energy pulses are used to perform electrical pulse treatment on the hot-pressed copper / molybdenum / copper layered composite material. The electrical pulse treatment conditions are as follows: pulse voltage is 30~50V, pulse frequency is 120~180Hz, and pulse time is 10~30s.

[0039] It should be noted that: in step 5, the pulse voltage can be selected from 30V, 35V, 40V, 45V, 50V, etc.; the pulse frequency can be selected from 120Hz, 130Hz, 140Hz, 150Hz, 160Hz, 170Hz, 180Hz, etc.; and the pulse time can be selected from 10s, 15s, 20s, 25s, 30s, etc.

[0040] Step 6: Surface Cleaning: The copper / molybdenum / copper layered composite material after high-energy electrical pulse treatment is cleaned of surface oxides. It is ultrasonically cleaned in anhydrous ethanol for 30 min to remove impurities from the surface, then removed and dried to obtain a high-performance copper / molybdenum / copper layered composite material with strong interfacial bonding.

[0041] This invention first uses laser to pre-define oriented micro-teeth on molybdenum and copper plates to achieve interfacial meshing. Further, the oriented micro-teeth undergo surface micro-plastic deformation to increase interfacial gradient defects, providing channels for the rapid diffusion of copper and molybdenum atoms. Even further, a DC-assisted hot-press diffusion furnace is used to micro-deform the copper / molybdenum composite material with the micro-teeth structure, eliminating voids between the copper / molybdenum micro-teeth while achieving efficient diffusion of copper and molybdenum atoms, thus realizing interfacial metallurgical bonding. Finally, a high-energy pulsed current is used to briefly treat the copper / molybdenum layered composite material, further increasing the diffusion of copper and molybdenum atoms and the thickness of the metallurgical diffusion layer, promoting recrystallization of the micro-deformed surface, and achieving highly reliable bonding of the copper / molybdenum interface. Ultimately, this results in the efficient preparation of a copper / molybdenum / copper layered composite material with excellent comprehensive performance.

[0042] The present invention will be further described below with reference to specific embodiments:

[0043] Example 1

[0044] Step 1: Raw material preparation: Select flat copper and molybdenum plates with dimensions of 30×40×1 mm, and polish them in sequence using sandpaper of 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000#. Then, ultrasonically clean them with anhydrous ethanol for 30 minutes to remove impurities from the surface of the plates, and then take them out and dry them.

[0045] Step 2: Surface micro-tooth processing: Laser processing was used to perform single-sided and double-sided fixed-angle micro-tooth processing on copper and molybdenum plates respectively. The laser parameters were as follows: cutting power of 300 W, cutting speed of 2 mm / min, protective gas of nitrogen, cutting pressure of 1.0 MPa, cutting angle θ of 45°, cutting angle ε of 150°, long tooth side length a of 0.6 mm, and tooth groove width l of 1.5 mm.

[0046] Step 3: Surface treatment: The micro-tooth surface is micro-plastically deformed using sandblasting technology. The sandblasting parameters and process are as follows: 100-mesh SiO2 quartz sand with a pressure range of 0.9 MPa and a sandblasting time of 1 min; 10 ultrasonic cleaning cycles of anhydrous ethanol for 30 min.

[0047] Step 4: Hot-press bonding: The surface-treated copper / molybdenum plates are hot-pressed and diffused together using a DC-assisted hot-press diffusion furnace. The hot-pressing parameters and process are as follows: vacuum degree is 10. -3 Pa, the hot-press diffusion bonding pressure is 40 MPa, the temperature is 700 ℃, the heat and pressure holding time is 60 min, and the overall deformation is 2%.

[0048] Step 5: Electrical pulse treatment: High-energy pulses are used to perform electrical pulse treatment on the hot-pressed copper / molybdenum / copper layered composite material. The electrical pulse parameters are as follows: pulse voltage is 30 V, pulse frequency is 180 Hz, and pulse time is 10 s.

[0049] Step 6: Surface Cleaning: The copper / molybdenum / copper layered composite material after electrical pulse treatment is cleaned of surface oxides. It is ultrasonically cleaned in anhydrous ethanol for 30 minutes to remove impurities from the surface, then removed and dried to obtain a high-performance copper / molybdenum / copper layered composite material with strong interfacial bonding.

[0050] Example 2

[0051] Step 1: Raw material preparation: Select flat copper and molybdenum plates with dimensions of 30×40×1 mm, and polish them in sequence using sandpaper of 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000#. Then, ultrasonically clean them with anhydrous ethanol for 30 minutes to remove impurities from the surface of the plates, and then take them out and dry them.

[0052] Step 2: Surface micro-tooth processing: Laser processing was used to perform single-sided and double-sided fixed-angle micro-tooth processing on copper and molybdenum plates respectively. The laser parameters were as follows: cutting power of 600 W, cutting speed of 5 mm / min, protective gas of nitrogen, cutting pressure of 0.5 MPa, cutting angle θ of 30°, cutting angle ε of 165°, long tooth side length a of 1.54 mm, and tooth groove width l of 3 mm.

[0053] Step 3: Surface treatment: The micro-tooth surface is micro-plastically deformed using sandblasting technology. The sandblasting parameters and process are as follows: 250-mesh SiO2 quartz sand with a pressure range of 0.3 MPa and a sandblasting time of 5 min; 10 ultrasonic cleaning cycles of anhydrous ethanol for 30 min.

[0054] Step 4: Hot-press bonding: The surface-treated copper / molybdenum plates are hot-pressed and diffused together using a DC-assisted hot-press diffusion furnace. The hot-pressing parameters and process are as follows: vacuum degree is 10. -3 Pa, the hot-press diffusion bonding pressure is 20 MPa, the temperature is 900 ℃, the heat and pressure holding time is 20 min, and the overall deformation is 5%.

[0055] Step 5: Electrical pulse treatment: High-energy pulses are used to perform electrical pulse treatment on the hot-pressed copper / molybdenum / copper layered composite material. The electrical pulse parameters are as follows: pulse voltage is 50 V, pulse frequency is 120 Hz, and pulse time is 30 s.

[0056] Step 6: Surface Cleaning: The copper / molybdenum / copper layered composite material after electrical pulse treatment is cleaned of surface oxides. It is ultrasonically cleaned in anhydrous ethanol for 30 minutes to remove impurities from the surface, then removed and dried to obtain a high-performance copper / molybdenum / copper layered composite material with strong interfacial bonding.

[0057] Example 3

[0058] Step 1: Raw material preparation: Select flat copper and molybdenum plates with dimensions of 30×40×1 mm, and polish them in sequence using sandpaper of 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000#. Then, ultrasonically clean them with anhydrous ethanol for 30 minutes to remove impurities from the surface of the plates, and then take them out and dry them.

[0059] Step 2: Surface micro-tooth processing: Laser processing was used to perform single-sided and double-sided fixed-angle micro-tooth processing on copper and molybdenum plates respectively. The laser parameters were as follows: cutting power of 450 W, cutting speed of 3 mm / min, protective gas of nitrogen, cutting pressure of 0.8 MPa, cutting angle θ of 40°, cutting angle ε of 160°, long tooth side length a of 1.1 mm, and tooth groove width l of 2 mm.

[0060] Step 3: Surface treatment: The micro-tooth surface is micro-plastically deformed using sandblasting technology. The sandblasting parameters and process are as follows: 200-mesh SiO2 quartz sand with a pressure range of 0.6 MPa and a sandblasting time of 3 min; 10 ultrasonic cleaning cycles of anhydrous ethanol for 30 min.

[0061] Step 4: Hot-press bonding: The surface-treated copper / molybdenum plates are hot-pressed and diffused together using a DC-assisted hot-press diffusion furnace. The hot-pressing parameters and process are as follows: vacuum degree is 10. -3 Pa, the hot-press diffusion bonding pressure is 30 MPa, the temperature is 800 ℃, the heat and pressure holding time is 40 min, and the overall deformation is 3%.

[0062] Step 5: Electrical pulse treatment: High-energy pulses are used to perform electrical pulse treatment on the hot-pressed copper / molybdenum / copper layered composite material. The electrical pulse parameters are as follows: pulse voltage is 40 V, pulse frequency is 150 Hz, and pulse time is 20 s.

[0063] Step 6: Surface Cleaning: The copper / molybdenum / copper layered composite material after electrical pulse treatment is cleaned of surface oxides. It is ultrasonically cleaned in anhydrous ethanol for 30 minutes to remove impurities from the surface, then removed and dried to obtain a high-performance copper / molybdenum / copper layered composite material with strong interfacial bonding.

[0064] The composite material interface obtained in Example 3 was characterized by SEM microstructure, and the results are as follows: Figure 3 As shown, the interface is defect-free, achieving a combination of mechanical and interface metallurgy.

[0065] Obviously, those skilled in the art can make various modifications and variations to this technical solution without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this technical solution and their equivalents, this technical solution also intends to include these modifications and variations.

Claims

1. A method for regulating the copper / molybdenum / copper interface and preparing layered composite materials, characterized in that, Includes the following steps: Step 1: Laser processing is used to perform single-sided and double-sided fixed-angle micro-tooth processing on the pre-treated copper and molybdenum plates respectively. To achieve interfacial meshing connection between the molybdenum and copper plates, pre-oriented micro-tooths are used. The laser processing conditions are as follows: cutting power 300~600 W, cutting speed 2~5 mm / min, cutting pressure 0.5~1.0 MPa, cutting angle θ 30°~45° (θ is the angle between the short side of the micro-tooth and the root of the tooth groove); cutting angle ε 165°~150° (ε is the angle between the long side of the micro-tooth and the root of the tooth groove, θ>180°-ε), long tooth side length a 0.6~1.54 mm, and tooth groove width l 1.5~3 mm. Step 2: The micro-toothed surfaces of the copper and molybdenum plates obtained in Step 1 are subjected to micro-plastic deformation using sandblasting technology. The sandblasting process conditions are as follows: sandblasting pressure range is 0.3~0.9 MPa, and sandblasting time is 1~5 min. Step 3: Perform DC-assisted hot pressing diffusion bonding on the copper and molybdenum plates after surface treatment in Step 2 to obtain a copper / molybdenum / copper layered composite plate. The hot pressing process conditions are as follows: hot pressing diffusion bonding pressure is 20~40 MPa, temperature is 700~900℃, holding time is 20~60 min, and overall deformation is 2%~5%. During hot pressing diffusion bonding, the vacuum degree in the DC-assisted hot pressing diffusion furnace is 10 MPa. -3 Pa, the direction of the applied current is perpendicular to the copper / molybdenum / copper layered composite plate; Step 4: Perform high-energy electrical pulse treatment on the copper / molybdenum / copper layered composite plate obtained in Step 3. The electrical pulse process conditions are as follows: pulse voltage is 30~50V, pulse frequency is 120~180Hz, and pulse time is 10~30s.

2. The method for regulating the copper / molybdenum / copper interface and preparing layered composite materials as described in claim 1, characterized in that, In step 1, the pretreatment process of the copper plate and the molybdenum plate is as follows: the copper plate and the molybdenum plate are polished in sequence using sandpaper of 80#, 400#, 600#, 800#, 1000#, 1500# and 2000#, then ultrasonically cleaned in anhydrous ethanol to remove impurities from the surface of the plates, and then dried after removal.

3. The method for regulating the copper / molybdenum / copper interface and preparing layered composite materials as described in claim 1, characterized in that, The protective gas used in the laser processing in step 1 is nitrogen.

4. The method for regulating the copper / molybdenum / copper interface and preparing layered composite materials as described in claim 1, characterized in that, In step 2, 100-250 mesh SiO2 quartz sand is used for sandblasting.

5. The method for regulating the copper / molybdenum / copper interface and preparing layered composite materials as described in claim 1, characterized in that, In step 2, after sandblasting, anhydrous ethanol is used for ultrasonic cleaning to remove residual sandblasting particles from the surface.

6. The method for regulating the copper / molybdenum / copper interface and preparing layered composite materials as described in claim 1, characterized in that, In step 3, a DC-assisted hot-press diffusion furnace is used to hot-press and diffuse the copper plate and the molybdenum plate together.

7. The method for regulating the copper / molybdenum / copper interface and preparing layered composite materials as described in claim 1, characterized in that, The preparation method further includes: ultrasonically cleaning the copper / molybdenum / copper layered composite plate after high-energy electrical pulse treatment in anhydrous ethanol to remove impurities from the plate surface, and then drying the plate surface to obtain a high-performance copper / molybdenum / copper layered composite material with high interfacial bonding.

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