Copper / molybdenum / copper interface regulation and preparation method of layered composite material

Abstract

The invention provides a method for regulating and controlling a copper / molybdenum / copper interface and preparing a layered composite material, and relates to the technical field of layered composite material machining, the method comprises the steps that laser machining is adopted, single-face and double-face fixed-angle micro-tooth machining is conducted on a pretreated copper plate and a pretreated molybdenum plate, and the laser machining process conditions are as follows: the cutting power is 300-600 W, the cutting speed is 2-5 mm / min, and the cutting time is 2-5 min; the cutting pressure is 0.5 to 1.0 MPa; the micro-tooth surfaces of the copper plate and the molybdenum plate are subjected to micro-plastic deformation through the sand blasting technology, and the sand blasting process conditions are as follows: the sand blasting pressure range is 0.3-0.9 MPa, and the sand blasting time is 1-5 min; performing direct-current auxiliary hot-pressing diffusion bonding on the copper plate and the molybdenum plate subjected to surface treatment to obtain a copper / molybdenum / copper layered composite plate; and performing high-energy electric pulse treatment on the obtained copper / molybdenum / copper laminated composite plate. According to the method, the surface structure design and current-assisted preparation integrated forming technology is adopted, macroscopic meshing mechanical connection is designed to be combined with microscopic metallurgical diffusion, and reliable connection of the copper / molybdenum interface is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of layered composite material processing, and in particular to a method for controlling a copper / molybdenum / copper interface and preparing a layered composite material. Background Art

[0002] With the continuous development of electronic packaging technology, high heat flux density has put forward higher requirements for chip heat dissipation, and the selection of heat dissipation materials with excellent performance has become a research hotspot. Molybdenum-copper (MoCu) alloy and its composite materials have attracted widespread attention due to their low thermal expansion coefficient and high thermal conductivity. Copper / molybdenum / copper multilayer metal heat sink material is a high-performance layered composite material designed specifically for the field of electronic packaging. It has both the high thermal conductivity of copper and the low thermal expansion coefficient of molybdenum, and its thermal expansion coefficient is adjustable, so it is widely used.

[0003] The physical and chemical properties of molybdenum and copper are quite different. Traditional connection methods such as infiltration, mechanical connection, welding, etc. have problems such as insufficient bonding strength, complex process, and high cost. In recent years, DC-assisted hot pressing diffusion bonding, as an emerging green and efficient connection technology, has attracted the attention of many scientific researchers due to its simple operation, low cost, and ability to achieve good interface bonding. However, for copper and molybdenum, which are insoluble metals, how to improve their interface metallurgical bonding is still a certain challenge. Summary of the invention

[0004] In response to the problems mentioned in the above background technology, the present invention proposes a method for regulating the copper / molybdenum / copper interface and preparing a layered composite material. It adopts surface treatment + current-assisted preparation integrated molding technology, designs a combination of macro-meshing mechanical connection and micro-metallurgical diffusion, realizes reliable connection of the copper / molybdenum interface, and improves the comprehensive performance of the copper / molybdenum / copper layered composite material.

[0005] To achieve the above object, the present invention adopts the following technical solution: The present invention provides a method for controlling a copper / molybdenum / copper interface and preparing a layered composite material, comprising the following steps: Step 1: Using laser processing, the pretreated copper plate and molybdenum plate are processed with single-sided and double-sided fixed-angle micro-teeth, 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; Step 2: micro-plastic deformation of the micro-tooth surfaces of the copper plate and the molybdenum plate obtained in step 1 is performed by sandblasting technology, wherein the sandblasting process conditions are as follows: the sandblasting pressure range is 0.3-0.9 MPa, and the sandblasting time is 1-5 min; Step 3: Perform direct current assisted hot pressing diffusion bonding on the copper plate and the molybdenum plate after the surface treatment in step 2 to obtain a copper / molybdenum / copper layered composite plate, wherein the hot pressing process conditions are as follows: the hot pressing diffusion bonding pressure is 20-40 MPa, the temperature is 700-900 °C, the heat preservation and pressure holding time is 20-60 min, and the overall deformation is 2%-5%; Step 4: The copper / molybdenum / copper layered composite plate obtained in step 3 is subjected to high-energy electric pulse treatment, wherein the electric pulse process conditions are as follows: the pulse voltage is 30-50V, the pulse frequency is 120-180Hz, and the pulse time is 10-30s.

[0006] As a further illustration of the present invention, in step 1, the pretreatment process of the copper plate and the molybdenum plate is: use 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000# sandpaper to grind and polish the copper plate and the molybdenum plate in sequence, then perform ultrasonic cleaning in anhydrous ethanol to remove impurities on the surface of the plate, and then take out and dry the surface.

[0007] As a further illustration of the present invention, the protective gas in the laser processing process in step 1 is nitrogen.

[0008] As a further illustration of the present invention, the laser processing in step 1 also includes the following process conditions: the cutting angle θ is 30°~45°, 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°, ε is the angle between the long side of the micro-tooth and the root of the tooth groove, θ>180°-ε, the length of the long tooth side a is 0.6~1.54 mm, and the tooth groove width l is 1.5~3 mm.

[0009] As a further illustration of the present invention, in step 2, SiO2 quartz sand with a mesh size of 100 to 250 is used for sandblasting.

[0010] As a further illustration of the present invention, in step 2, after the sandblasting, ultrasonic cleaning is performed using anhydrous ethanol to remove the sandblasting particles remaining on the surface.

[0011] As a further illustration of the present invention, in step 3, a direct current assisted hot pressing diffusion furnace is used to perform hot pressing diffusion bonding on the copper plate and the molybdenum plate.

[0012] As a further illustration of the present invention, in step 3, when hot pressing and diffusion bonding is performed, the vacuum degree in the DC-assisted hot pressing and diffusion furnace is 10 -3 Pa.

[0013] As a further illustration of the present invention, in step 3, when the hot pressing diffusion bonding is performed, the direction of the applied current is perpendicular to the copper / molybdenum / copper layered composite plates.

[0014] As a further illustration of the present invention, the preparation method also includes: ultrasonically cleaning the copper / molybdenum / copper layered composite plate after high-energy electric pulse treatment in anhydrous ethanol to remove impurities on the surface of the plate, taking it out and drying its surface to obtain a high-performance and high-interface-bonded copper / molybdenum / copper layered composite material.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention firstly pre-forms oriented micro-teeth on a molybdenum plate and a copper plate by laser to realize the interface meshing connection between the molybdenum plate and the copper plate; further, the oriented micro-teeth are subjected to surface micro-plastic deformation to increase interface gradient defects, thereby providing a channel for the subsequent rapid diffusion of copper and molybdenum atoms; further, a direct current-assisted hot pressing diffusion furnace is used to micro-deform a copper / molybdenum composite material with a micro-teeth structure, thereby eliminating the gaps between the copper / molybdenum micro-teeth and realizing efficient diffusion of copper atoms and molybdenum atoms, thereby realizing interface metallurgical bonding; finally, a high-energy pulse current is used to perform a short-time treatment on the copper / molybdenum layered composite material, thereby further improving the diffusion of copper and molybdenum atoms and the thickness of the metallurgical diffusion layer, promoting recrystallization of the micro-deformed surface, realizing highly reliable bonding of the copper / molybdenum interface, and finally realizing efficient preparation of a copper / molybdenum / copper layered composite material with excellent comprehensive performance.

[0016] Other features and advantages of the technical solution will be described in the subsequent description, and partly become apparent from the description, or understood by implementing the technical solution. The purpose and other advantages of the technical solution can be achieved and obtained through the structures specifically pointed out in the written description and the drawings.

[0017] The technical solution of the present technical solution is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the technical solution and constitute a part of the specification. Together with the embodiments of the technical solution, they are used to explain the technical solution and do not constitute a limitation of the technical solution. In the accompanying drawings: Figure 1 A flow chart of the method for controlling the copper / molybdenum / copper interface and preparing a layered composite material provided by the present invention; Figure 2 A schematic diagram of the sawtooth interface structure of the copper / molybdenum / copper layered composite material provided by the present invention; Figure 3 This is the microstructure of the bonding interface of the copper / molybdenum / copper layered composite material prepared in Example 3 of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present technical solution are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present technical solution, and are not used to limit the present technical solution.

[0020] like Figure 1 As shown, the embodiment of the present invention provides a method for controlling the copper / molybdenum / copper interface and preparing a layered composite material, comprising the following steps: Step 1: Raw material preparation: Select flat copper plates and molybdenum plates with a size of 30×40×1 mm, and use 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000# sandpaper to grind and polish them in turn, then ultrasonically clean them in anhydrous ethanol for 30 min to remove impurities on the surface of the plates, and take them out for surface drying.

[0021] Step 2: Surface micro-tooth processing: Laser processing is used to process single-sided and double-sided fixed-angle micro-tooths on copper plates and molybdenum plates respectively. The laser processing process conditions are as follows: cutting power is 300~600 W, cutting speed is 2~5 mm / min, protective gas is nitrogen, cutting pressure is 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) is 30°~45°, cutting angle ε (ε, is the angle between the long side of the micro-tooth and the root of the tooth groove) is 165°~150°, θ>180°-ε, long tooth side length a is 0.6~1.54 mm, and tooth groove width l is 1.5~3 mm.

[0022] It should be noted that: the cutting power in step 2 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 long tooth side length 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.; the tooth groove width l can be selected from 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0023] The role of the surface micro-tooth processing technology in the present invention is mainly reflected in the following two aspects: First: One of the roles of micro-tooths is mechanical meshing. The micro-tooth angle designed by the present invention can not only realize mechanical connection for the copper / molybdenum interface, but also expand the connection area. Its angle will provide a corresponding high thermal resistance interface for subsequent current-assisted preparation and processing, and promote interface metallurgical bonding. If θ and ε are both 90°, the micro-tooth only increases the contact area of ​​the copper / molybdenum interface, and its angle is parallel to the subsequent current direction, and further diffusion and metallurgical bonding of the parallel contact surface cannot be achieved. Therefore, the design of its angle is crucial. Secondly: The micro-tooth angle designed by the present invention is closely related to the current-assisted hot pressing and electric pulse treatment of steps 4 and 5. The designed θ and ε have a decisive effect on the magnitude of the component force of the electronic wind force at the copper / molybdenum interface, which can maximize the effects of hot pressing and electric pulse treatment. If θ and ε are both 90°, the electronic wind force reaches the minimum force perpendicular to the copper / molybdenum interface, and cannot play its due role, and the interface metallurgical bonding is incomplete.

[0024] Step 3: Surface treatment: Sand blasting technology is used to perform micro-plastic deformation on the micro-tooth surface. The sand blasting process conditions are as follows: the pressure range of 100-250 mesh SiO2 quartz sand is 0.3-0.9 MPa, and the sand blasting time is 1-5 min; use anhydrous ethanol for 5-10 times of ultrasonic cleaning for 30 min to remove the residual quartz sand particles on the metal surface.

[0025] 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 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, etc.; the sandblasting time can be selected from 1 min, 2 min, 3 min, 4 min, 5 min, etc.

[0026] Step 4: Hot pressing and diffusion bonding: A DC-assisted hot pressing and diffusion furnace is used to hot press and diffuse the surface-treated copper / molybdenum plates. The hot pressing and diffusion treatment process conditions are as follows: the vacuum degree is 10 -3 Pa, hot pressing diffusion bonding pressure is 20~40MPa, temperature is 700~900℃, heat preservation and pressure holding time is 20~60min, overall deformation is 2%~5%. The direction of applied current is perpendicular to the copper / molybdenum plates.

[0027] It should be noted that: the pressure of the hot pressing diffusion bonding treatment in step 4 can be selected from 20 MPa, 25 MPa, 30 MPa, 35 MPa, 40 MPa, etc.; the temperature can be selected from 700 ℃, 750 ℃, 800 ℃, 850 ℃, 900 ℃, etc.; the time for heat preservation and pressure holding can be selected from 20 min, 25 min, 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min, etc.; the overall deformation can be selected from 2%, 3%, 4%, 5%, etc.

[0028] Step 5: Electric pulse treatment: The hot-pressed copper / molybdenum / copper layered composite material is subjected to electric pulse treatment using high-energy pulses, wherein the electric pulse treatment conditions are as follows: pulse voltage is 30-50V, pulse frequency is 120-180Hz, and pulse time is 10-30s.

[0029] 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.; the pulse time can be selected from 10s, 15s, 20s, 25s, 30s, etc.

[0030] Step 6: Surface cleaning: Clean the surface oxides of the copper / molybdenum / copper layered composite material after the high-energy electric pulse. Ultrasonic cleaning is performed in anhydrous ethanol for 30 minutes to remove impurities on the surface of the plate, and the plate is taken out and surface dried to obtain a high-performance and high-interface-bonded copper / molybdenum / copper layered composite material.

[0031] The present invention firstly pre-forms oriented micro-teeth on a molybdenum plate and a copper plate by laser to realize the interface meshing connection between the molybdenum plate and the copper plate; further, the oriented micro-teeth are subjected to surface micro-plastic deformation to increase interface gradient defects, thereby providing a channel for the subsequent rapid diffusion of copper and molybdenum atoms; further, a direct current-assisted hot pressing diffusion furnace is used to micro-deform a copper / molybdenum composite material with a micro-teeth structure, thereby eliminating the gaps between the copper / molybdenum micro-teeth and realizing efficient diffusion of copper atoms and molybdenum atoms, thereby realizing interface metallurgical bonding; finally, a high-energy pulse current is used to perform a short-time treatment on the copper / molybdenum layered composite material, thereby further improving the diffusion of copper and molybdenum atoms and the thickness of the metallurgical diffusion layer, promoting recrystallization of the micro-deformed surface, realizing highly reliable bonding of the copper / molybdenum interface, and finally realizing efficient preparation of a copper / molybdenum / copper layered composite material with excellent comprehensive performance.

[0032] The present invention will be further described below in conjunction with specific embodiments: Example 1

[0033] Step 1: Raw material preparation: Select flat copper plates and molybdenum plates with a size of 30×40×1 mm, and use 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000# sandpaper to grind and polish them in turn, then ultrasonically clean them in anhydrous ethanol for 30 min to remove impurities on the surface of the plates, and take them out for surface drying.

[0034] Step 2: Surface micro-tooth processing: Laser processing was used to perform single-sided and double-sided fixed-angle micro-tooth processing on the copper plate and molybdenum plate, 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.

[0035] Step 3: Surface treatment: Sand blasting technology is used to perform micro-plastic deformation on the micro-tooth surface. The sand blasting parameters and process are as follows: the pressure range of 100-mesh SiO2 quartz sand is 0.9 MPa, and the sand blasting time is 1 min; anhydrous ethanol is used for 10 times of ultrasonic cleaning for 30 min.

[0036] Step 4: Hot pressing and diffusion bonding: A DC-assisted hot pressing and diffusion furnace is used to hot press and diffuse the surface treated copper / molybdenum plates. The hot pressing parameters and process are as follows: The vacuum degree is 10 -3 Pa, the hot pressing diffusion bonding pressure is 40 MPa, the temperature is 700 ℃, the heat preservation and pressure holding time is 60 min, and the overall deformation is 2%.

[0037] Step 5: Electric pulse treatment: The copper / molybdenum / copper layered composite material bonded by heat pressing is subjected to electric pulse treatment using high energy pulses, wherein the electric pulse parameters are as follows: pulse voltage is 30 V, pulse frequency is 180 Hz, and pulse time is 10 s.

[0038] Step 6: Surface cleaning: Clean the surface oxides of the copper / molybdenum / copper layered composite material after the electric pulse. Ultrasonic cleaning is performed in anhydrous ethanol for 30 minutes to remove impurities on the surface of the plate, and the plate is taken out and surface dried to obtain a high-performance and high-interface-bonded copper / molybdenum / copper layered composite material.

[0039] Example 2 Step 1: Raw material preparation: Select flat copper plates and molybdenum plates with a size of 30×40×1 mm, and use 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000# sandpaper to grind and polish them in turn, then ultrasonically clean them in anhydrous ethanol for 30 min to remove impurities on the surface of the plates, and take them out for surface drying.

[0040] Step 2: Surface micro-tooth processing: Laser processing was used to perform single-sided and double-sided fixed-angle micro-tooth processing on the copper plate and molybdenum plate, respectively. The laser parameters were as follows: cutting power was 600 W, cutting speed was 5 mm / min, protective gas was nitrogen, cutting pressure was 0.5 MPa, cutting angle θ was 30°, cutting angle ε was 165°, long tooth side length a was 1.54 mm, and tooth groove width l was 3 mm.

[0041] Step 3: Surface treatment: Sand blasting technology is used to perform micro-plastic deformation on the micro-tooth surface. The sand blasting parameters and process are as follows: the pressure range of 250-mesh SiO2 quartz sand is 0.3 MPa, and the sand blasting time is 5 min; anhydrous ethanol is used for 10 times of ultrasonic cleaning for 30 min.

[0042] Step 4: Hot pressing and diffusion bonding: A DC-assisted hot pressing and diffusion furnace is used to hot press and diffuse the surface treated copper / molybdenum plates. The hot pressing parameters and process are as follows: The vacuum degree is 10 -3 Pa, the hot pressing diffusion bonding pressure is 20 MPa, the temperature is 900 ℃, the heat preservation and pressure holding time is 20 min, and the overall deformation is 5%.

[0043] Step 5: Electric pulse treatment: The hot-pressed copper / molybdenum / copper layered composite material is subjected to electric pulse treatment using high-energy pulses, wherein the electric pulse parameters are as follows: pulse voltage is 50 V, pulse frequency is 120 Hz, and pulse time is 30 s.

[0044] Step 6: Surface cleaning: Clean the surface oxides of the copper / molybdenum / copper layered composite material after the electric pulse. Ultrasonic cleaning is performed in anhydrous ethanol for 30 minutes to remove impurities on the surface of the plate, and the plate is taken out and surface dried to obtain a high-performance and high-interface-bonded copper / molybdenum / copper layered composite material.

[0045] Example 3

[0046] Step 1: Raw material preparation: Select flat copper plates and molybdenum plates with a size of 30×40×1 mm, and use 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000# sandpaper to grind and polish them in turn, then ultrasonically clean them in anhydrous ethanol for 30 min to remove impurities on the surface of the plates, and take them out for surface drying.

[0047] Step 2: Surface micro-tooth processing: Laser processing is used to perform single-sided and double-sided fixed-angle micro-tooth processing on copper plates and molybdenum plates, respectively. The laser parameters are as follows: cutting power is 450 W, cutting speed is 3 mm / min, protective gas is nitrogen, cutting pressure is 0.8 MPa, cutting angle θ is 40°, cutting angle ε is 160°, long tooth side length a is 1.1 mm, and tooth groove width l is 2 mm.

[0048] Step 3: Surface treatment: Sand blasting technology is used to perform micro-plastic deformation on the micro-tooth surface. The sand blasting parameters and process are as follows: the pressure range of 200-mesh SiO2 quartz sand is 0.6 MPa, and the sand blasting time is 3 minutes; anhydrous ethanol is used for 10 times of ultrasonic cleaning for 30 minutes.

[0049] Step 4: Hot pressing and diffusion bonding: A DC-assisted hot pressing and diffusion furnace is used to hot press and diffuse the surface treated copper / molybdenum plates. The hot pressing parameters and process are as follows: The vacuum degree is 10 -3 Pa, the hot pressing diffusion bonding pressure is 30 MPa, the temperature is 800 ℃, the heat preservation and pressure holding time is 40 min, and the overall deformation is 3%.

[0050] Step 5: Electric pulse treatment: The copper / molybdenum / copper layered composite material bonded by heat pressing is subjected to electric pulse treatment using high energy pulses, wherein the electric pulse parameters are as follows: pulse voltage is 40 V, pulse frequency is 150 Hz, and pulse time is 20 s.

[0051] Step 6: Surface cleaning: Clean the surface oxides of the copper / molybdenum / copper layered composite material after the electric pulse. Ultrasonic cleaning is performed in anhydrous ethanol for 30 minutes to remove impurities on the surface of the plate, and the plate is taken out and surface dried to obtain a high-performance and high-interface-bonded copper / molybdenum / copper layered composite material.

[0052] The SEM structure characterization of the composite material interface obtained in Example 3 is as follows: Figure 3 As shown, the interface is defect-free, achieving dual bonding of mechanical and interface metallurgy.

[0053] Obviously, those skilled in the art can make various changes and modifications to the technical solution without departing from the spirit and scope of the technical solution. Thus, if these modifications and variations of the technical solution fall within the scope of the claims of the technical solution and their equivalents, the technical solution is also intended to include these modifications and variations.

Claims

1. A method for controlling the interface of copper / molybdenum / copper and preparing a layered composite material, characterized in that: The steps include: Step 1: Using laser processing, the pretreated copper plate and molybdenum plate are processed with single-sided and double-sided fixed-angle micro-teeth, 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; Step 2: micro-plastic deformation of the micro-tooth surfaces of the copper plate and the molybdenum plate obtained in step 1 is performed by sandblasting technology, wherein the sandblasting process conditions are as follows: the sandblasting pressure range is 0.3-0.9 MPa, and the sandblasting time is 1-5 min; Step 3: Perform direct current assisted hot pressing diffusion bonding on the copper plate and the molybdenum plate after the surface treatment in step 2 to obtain a copper / molybdenum / copper layered composite plate, wherein the hot pressing process conditions are as follows: the hot pressing diffusion bonding pressure is 20-40 MPa, the temperature is 700-900°C, the heat preservation and pressure holding time is 20-60 min, and the overall deformation is 2%-5%; Step 4: The copper / molybdenum / copper layered composite plate obtained in step 3 is subjected to high-energy electric pulse treatment, wherein the electric pulse process conditions are as follows: the pulse voltage is 30-50V, the pulse frequency is 120-180Hz, and the pulse time is 10-30s.

2. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 1, characterized in that: In step 1, the pretreatment process of the copper plate and the molybdenum plate is: use 80#, 400#, 600#, 800#, 1000#, 1500#, and 2000# sandpaper to grind and polish the copper plate and the molybdenum plate in sequence, then perform ultrasonic cleaning in anhydrous ethanol to remove impurities on the surface of the plate, and then dry the surface after taking it out.

3. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 1, characterized in that: The protective gas for the laser processing in step 1 is nitrogen.

4. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 1, characterized in that: The laser processing in step 1 also includes the following process conditions: the cutting angle θ is 30°~45°, 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°, ε is the angle between the long side of the micro-tooth and the root of the tooth groove, θ>180°-ε, the length of the long tooth side a is 0.6~1.54 mm, and the tooth groove width l is 1.5~3 mm.

5. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 4, characterized in that: In step 2, SiO2 quartz sand with a mesh size of 100 to 250 is used for sandblasting.

6. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 1, characterized in that: In step 2, after the sandblasting, ultrasonic cleaning is performed using anhydrous ethanol to remove the sandblasting particles remaining on the surface.

7. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 1, characterized in that: In step 3, a direct current assisted hot pressing diffusion furnace is used to perform hot pressing diffusion bonding on the copper plate and the molybdenum plate.

8. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 7, characterized in that: In step 3, when hot pressing and diffusion bonding is performed, the vacuum degree in the DC-assisted hot pressing and diffusion furnace is 10 -3 Pa.

9. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 1, characterized in that: In step 3, when performing hot pressing diffusion bonding, the direction of the applied current is perpendicular to the copper / molybdenum / copper layered composite plates.

10. The method for controlling the copper / molybdenum / copper interface and preparing a layered composite material according to claim 1, characterized in that: The preparation method also includes: ultrasonically cleaning the copper / molybdenum / copper layered composite plate after high-energy electric pulse treatment in anhydrous ethanol to remove impurities on the surface of the plate, taking it out and drying its surface to obtain a high-performance and high-interface-bonded copper / molybdenum / copper layered composite material.

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