A copper / molybdenum copper / copper composite coiled material and a method for manufacturing the same

Abstract

The application provides a copper / molybdenum copper / copper composite coil and a preparation method thereof, and relates to the technical field of heat sink materials.The method is as follows: copper coil stock and molybdenum copper alloy coil stock are prepared in proportion; the copper coil stock and the molybdenum copper alloy coil stock are pickled; the copper coil stock and the molybdenum copper alloy coil stock after pickling are subjected to hot-pressing composite treatment, and the rolling force and the roll gap are adjusted to obtain a composite material; the composite material after hot-pressing is subjected to first annealing treatment; the composite material after the first annealing is subjected to cold rolling treatment, and the rolling force and the roll gap are adjusted; the composite material after cold rolling is subjected to second annealing treatment; and the composite material after the second annealing is subjected to trimming treatment, and the copper / molybdenum copper / copper composite coil is obtained.The copper / molybdenum copper / copper composite coil prepared by the method is more conducive to realizing subsequent automatic machining such as cutting and stamping, the rolling composite in the form of coil stock can realize automatic material production, the labor cost can be saved, and the production efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of heat sink materials technology, and in particular to a copper / molybdenum copper / copper composite roll and its preparation method. Background Technology

[0002] Copper / molybdenum copper / copper (CPC) material is a three-layer composite material. Copper possesses excellent thermal and electrical conductivity and is easily plastically deformable, making it suitable for processing and molding, and widely used in industrial manufacturing. Molybdenum has a low coefficient of thermal expansion and is relatively stable in high-temperature environments. Mixing copper and molybdenum forms a molybdenum-copper alloy, thus combining good thermal conductivity and a low coefficient of thermal expansion. Furthermore, the required performance parameters can be adjusted by varying the proportions of the components to meet specific performance requirements. This three-layer copper / molybdenum-copper / copper composite material is widely used in the electronic packaging industry. It is connected to an alumina ceramic plate at a brazing temperature of 800℃, serving as a base for heat dissipation. However, this requires that severe deformation and tearing not occur after brazing. Therefore, in addition to high thermal conductivity, the two components must also have matched coefficients of thermal expansion.

[0003] Currently, the method for preparing copper / molybdenum copper / copper (CPC) materials involves placing copper sheets on both sides of a molybdenum copper sheet, performing high-temperature pre-composite bonding, hot rolling, and finally cold rolling to the required thickness to produce a three-layer composite copper / molybdenum copper / copper (CPC) material. However, the direct hot rolling composite method is prone to causing unevenness at the composite interface. In addition, the sheet method makes it difficult to achieve continuous material production, resulting in low production efficiency and hindering the automation of subsequent product processing.

[0004] Therefore, this invention designs a copper / molybdenum copper / copper composite roll and its preparation method. Summary of the Invention

[0005] This invention provides a copper / molybdenum copper / copper composite coil and its preparation method, aiming to solve the problem of interfacial unevenness in copper / molybdenum copper / copper materials, which directly affects the warpage of the product. Furthermore, hot-rolled composites using sheet metal methods are difficult to produce continuously, resulting in low production efficiency and hindering automated production of subsequent product processing.

[0006] To achieve the above objectives, embodiments of the present invention provide a copper / molybdenum copper / copper composite coil and its preparation method. The present invention first prepares copper and molybdenum copper coils, pickles them, then hot-presses them together, followed by a first annealing, cold rolling, a second annealing, and trimming. The copper / molybdenum copper / copper composite coil prepared by the present invention has a straighter interface, which is beneficial for preventing warping after brazing and solves the problem of uneven interface in the existing copper / molybdenum copper / copper material production process. Furthermore, the copper / molybdenum copper / copper composite coil prepared by the present invention is more conducive to the automation of subsequent cutting, stamping, and other machining processes. Using coil form for rolling and composite can achieve automated material production, saving labor costs and increasing production efficiency.

[0007] An embodiment of the present invention provides a method for preparing copper / molybdenum copper / copper composite rolls, comprising the following steps:

[0008] S1. Prepare copper coils and molybdenum-copper alloy coils according to the specified proportions;

[0009] S2. Pickling is performed on the above-mentioned copper coils and molybdenum-copper alloy coils;

[0010] S3. Hot pressing composite treatment is performed on the pickled copper coil and molybdenum-copper alloy coil to obtain composite material;

[0011] S4. Perform a first annealing treatment on the hot-pressed composite material;

[0012] S5. The composite material after the first annealing is subjected to cold rolling;

[0013] S6. Perform a second annealing treatment on the cold-rolled composite material;

[0014] S7. Trim the edges of the composite material after the second annealing to obtain the final product.

[0015] Preferably, the molybdenum-copper alloy coil in step S1 is prepared by spraying.

[0016] Preferably, the molybdenum-copper alloy coil has a composition ratio of Mo... 60 Cu, Mo 65 Cu, Mo 70 Cu, Mo 75 Cu, Mo 80 Cu.

[0017] Preferably, the pickling in step S2 uses 5% dilute sulfuric acid.

[0018] Preferably, in step S3, the hot-pressing composite pressure is 1–20 kN, the temperature is 600–900 °C, and the time is 20–120 min.

[0019] Preferably, the first annealing temperature in step S4 is 600-850°C, and the annealing time is 0.5-2 hours.

[0020] Preferably, in step S5, the rolling force of cold rolling is 1 to 1000 KN, the roll gap is 0.1 to 3 mm, and the thickness of the cold-rolled composite material (copper / molybdenum copper / copper) is controlled at 0.1 to 1.5 mm.

[0021] Preferably, the second annealing temperature in step S6 is 700–1000°C, and the annealing time is 1–4 hours.

[0022] Preferably, in step S7, the trimming process is performed along the edge in the width direction.

[0023] Based on a general inventive concept, embodiments of the present invention provide copper / molybdenum copper / copper composite rolls prepared by the above-described method.

[0024] The above-described solution of the present invention has the following beneficial effects:

[0025] The copper / molybdenum copper / copper composite coil prepared by this invention has a flatter interface, which is beneficial to prevent warping after brazing and solves the problem of uneven interface in the production process of existing copper / molybdenum copper / copper materials. Moreover, the copper / molybdenum copper / copper composite coil prepared by this invention is more conducive to the automation of subsequent cutting, stamping and other machining processes. Rolling composite in coil form can realize automated material production, save labor costs and have high production efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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 based on these drawings without creative effort.

[0027] Figure 1 This is a schematic flowchart of a method for preparing a copper / molybdenum copper / copper composite roll according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the process flow for preparing a copper / molybdenum copper / copper composite roll according to an embodiment of the present invention. Detailed Implementation

[0029] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0030] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0031] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0032] This invention addresses existing problems by providing a copper / molybdenum copper / copper composite roll and its preparation method.

[0033] An embodiment of the present invention provides a method for preparing copper / molybdenum copper / copper composite rolls, the process flow diagram of which is shown below. Figure 1 As shown in the diagram, the process flow chart is as follows: Figure 2 As shown.

[0034] Example 1

[0035] Step 1: Preparation of copper and molybdenum-copper: Based on a thickness ratio of 1.05:4:1.05, prepare copper coils, molybdenum-copper coils, and copper coils. The molybdenum-copper coils are prepared using a spray method with powder. The core material composition is as follows: Mo... 70 Cu 30 Proportioning.

[0036] Step 2: Pickling: Pickle the prepared copper coils and molybdenum-copper coils with 5% dilute sulfuric acid and set aside for use.

[0037] Step 3: Hot pressing composite: Copper, molybdenum copper and copper are fed by a coil feeder. After the materials are stacked in three layers by the guide rail, they are hot pressed composite in a furnace at a pressure of 6KN, a temperature of 800℃ and a holding time of 60min.

[0038] Step 4: First annealing: After hot pressing, the composite material is annealed at 800℃ in a mesh belt annealing furnace to relieve stress.

[0039] Step 5: Cold rolling: Adjust the rolling force and roll gap to cold roll the composite material to obtain a strip with the required thickness of 1.0 mm.

[0040] Step 6 Secondary Annealing: After cold rolling, the composite material is annealed to relieve stress.

[0041] Step 7: Trimming: Further trim the edges of the rolled composite material with cracks in the width direction to obtain a material without composite defects.

[0042] Step 8: Receiving the material: The composite and trimmed material is received using a roll forming machine.

[0043] Example 2

[0044] Step 1: Preparation of copper and molybdenum-copper: Based on a thickness ratio of 1.05:4:1.05, prepare copper coils, molybdenum-copper coils, and copper coils. The molybdenum-copper coils are prepared using a spray method with powder. The core material composition is as follows: Mo... 70 Cu30 Proportioning.

[0045] Step 2: Pickling: Pickle the prepared copper coils and molybdenum-copper coils with 5% dilute sulfuric acid and set aside for use.

[0046] Step 3: Hot pressing composite: Copper, molybdenum copper and copper are fed by a coil feeder. After the materials are stacked in three layers by the guide rail, they are hot pressed composite in a furnace at a pressure of 7KN, a temperature of 800℃ and a holding time of 60min.

[0047] Step 4: First annealing: After hot pressing, the composite material is annealed at 800℃ in a mesh belt annealing furnace to relieve stress.

[0048] Step 5: Cold rolling: Adjust the rolling force and roll gap to cold roll the composite material to obtain a strip with the required thickness of 0.8 mm.

[0049] Step 6 Secondary Annealing: After cold rolling, the composite material is annealed to relieve stress.

[0050] Step 7: Trimming: Further trim the edges of the rolled composite material with cracks in the width direction to obtain a material without composite defects.

[0051] Step 8: Receiving the material: The composite and trimmed material is received using a roll forming machine.

[0052] Example 3

[0053] Step 1: Prepare copper and molybdenum-copper materials: Based on a thickness ratio of 1.05:4:1.05, prepare copper coils, molybdenum-copper coils, and copper coils. The molybdenum-copper coils are prepared using a spray method with powder. The core material composition is as follows: Mo 70 Cu 30 Proportioning.

[0054] Step 2: Pickling: Pickle the prepared copper coils and molybdenum-copper coils with 5% dilute sulfuric acid and set aside for use.

[0055] Step 3 Hot Press Composite: Copper, molybdenum copper and copper are fed by a coil feeder. After the materials are stacked in three layers by the guide rail, they are hot pressed in a furnace at a pressure of 8KN, a temperature of 800℃ and a holding time of 60min.

[0056] Step 4: First annealing: After hot pressing, the composite material is annealed at 800℃ for 1 hour in a mesh belt annealing furnace to relieve stress.

[0057] Step 5: Cold rolling: Adjust the rolling force and roll gap to cold roll the composite material to obtain a strip with the required thickness of 0.6 mm.

[0058] Step 6 Secondary Annealing: After cold rolling, the composite material is annealed for 1 hour to relieve stress.

[0059] Step 7: Trimming: Further trim the edges of the rolled composite material with cracks in the width direction to obtain a material without composite defects.

[0060] Step 8: Receiving the material: The composite and trimmed material is received using a roll forming machine.

[0061] With the material thickness, composite ratio, and core material composition unchanged, the thermal expansion performance parameters of the three cases were compared by changing the cold rolling amount. The results are as follows:

[0062]

[0063] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a copper / molybdenum copper / copper composite roll, characterized in that, Includes the following steps: S1. Prepare copper coils and molybdenum-copper alloy coils according to the specified proportions; S2. Pickling is performed on the above-mentioned copper coils and molybdenum-copper alloy coils; S3. The pickled copper coil and molybdenum-copper alloy coil are subjected to hot pressing composite treatment to obtain composite material; the hot pressing composite pressure in step S3 is 1~20KN, the temperature is 600~900℃, and the time is 20~120min. S4. Perform a first annealing treatment on the hot-pressed composite material; the first annealing temperature in step S4 is 600~850℃, and the annealing time is 0.5~2h; S5. The composite material after the first annealing is subjected to cold rolling; S6. Perform a second annealing treatment on the cold-rolled composite material; the second annealing temperature in step S6 is 700~1000℃, and the annealing time is 1~4h. S7. Trim the edges of the composite material after the second annealing to obtain the final product.

2. The method for preparing a copper / molybdenum copper / copper composite roll according to claim 1, characterized in that, In step S1, the molybdenum-copper alloy coil is prepared by spraying.

3. The method for preparing a copper / molybdenum copper / copper composite roll according to claim 2, characterized in that, The molybdenum-copper alloy coil has a composition ratio of Mo. 60 Cu, Mo 65 Cu, Mo 70 Cu, Mo 75 Cu, Mo 80 Cu.

4. The method for preparing a copper / molybdenum copper / copper composite roll according to claim 1, characterized in that, In step S2, pickling is performed using 5% dilute sulfuric acid.

5. The method for preparing a copper / molybdenum copper / copper composite roll according to claim 1, characterized in that, In step S5, the rolling force of cold rolling is 1~1000KN, and the roll gap is 0.1~3mm; the thickness of the composite material in cold rolling is controlled at 0.1~1.5mm.

6. The method for preparing a copper / molybdenum copper / copper composite roll according to claim 1, characterized in that, In step S7, the trimming process is performed along the edge in the width direction.

7. Copper / molybdenum copper / copper composite rolls prepared by the preparation method according to any one of claims 1 to 6.

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