A locally inlaid Cu / Al composite material and its preparation method

Abstract

The present invention provides a locally inlaid Cu / Al composite material and a preparation method thereof, including: performing cold composite on a Cu coil and an Al coil to obtain a first Cu / Al composite material; slitting the first Cu / Al composite material to obtain a first Cu / Al narrow strip coil; performing tension leveling on the first Cu / Al narrow strip coil to obtain a second Cu / Al narrow strip coil; further providing two Al coils, and performing local surface grooving on one of the two Al coils; performing warm composite on the second Cu / Al narrow strip coil, the grooved Al coil, and the ungrooved Al coil to obtain a first locally inlaid Cu / Al composite material; performing cold rolling on the first locally inlaid Cu / Al composite material to obtain a second locally inlaid Cu / Al composite material; slitting the second locally inlaid Cu / Al composite material to obtain the finished product of the locally inlaid Cu / Al composite material. The interfacial peel strength of the locally inlaid Cu / Al composite material of the present invention can reach more than 50 N / mm, and the generation of brittle phases at the copper-aluminum bonding interface can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a partially embedded Cu / Al composite material and a preparation method thereof. Background Art

[0002] Copper-aluminum composite materials are widely used in new energy, power electronics, communication base stations, building decoration and other fields. In the fields of communication base stations and building decoration, copper-aluminum composite materials are mainly used for lightweighting. In the fields of new energy and power electronics, there is not only a demand for lightweighting, but also high requirements for the peel strength of copper-aluminum composite materials. GB / T32468 requires that the peel strength of the material be greater than 12N / mm, but the requirements required by enterprises in actual use are higher than this standard, generally greater than 30N / mm.

[0003] At present, the main preparation methods at home and abroad are explosive composite method, cold and hot rolling composite method, casting method, continuous casting and rolling method, welding method, etc. Although the explosive composite method can obtain high peel strength, its yield rate is low, operability is poor, and there are safety and environmental protection issues; cold and hot rolling composite method can be mass-produced, but the peel strength is generally only 10-30N / mm; casting method and continuous casting and rolling method are limited by the type of aluminum alloy and the thickness of the copper layer, and the interface layer is thick, and the peel strength is poor; welding method, common ultrasonic and friction welding, is generally produced in the form of a single workpiece and requires machining, with extremely low efficiency and poor quality stability.

[0004] Chinese Patent 201510788267.6, title: Copper-aluminum composite material, small circuit breaker coil assembly and preparation method thereof, also involves a partially embedded copper-aluminum composite material, but its disadvantage is that the peel strength level of the composite material can only reach 10-30N / mm, and the peel strength needs to be further improved. Summary of the invention

[0005] In view of the defects in the prior art, the purpose of the present invention is to provide a partially inlaid Cu / Al composite material and a preparation method thereof, which solves the problem of low peeling strength of copper-aluminum inlaid composite materials produced by conventional cold and hot compounding methods by combining the preparation of Cu / Al composite narrow strips by a single cold compounding, pre-grooving of the substrate Al roll, and secondary warm compounding.

[0006] According to one aspect of the present invention, a method for preparing a partially embedded Cu / Al composite material is provided, the method comprising:

[0007] Providing a Cu coil and an Al coil, and cold-compounding the Cu coil and the Al coil to obtain a first Cu / Al composite material;

[0008] The first Cu / Al composite material is slit to obtain a first narrow strip coil of Cu / Al;

[0009] The first narrow strip coil of Cu / Al is stretcher-leveled to correct the side bend and obtain a second narrow strip coil of Cu / Al;

[0010] Two coils of Al material are provided, and local grooving is performed on one of the two coils of Al material;

[0011] The second narrow strip coil of Cu / Al, the grooved Al coil, and the ungrooved Al coil among the two coils of Al material are subjected to warm composite. Among them, the second narrow strip coil of Cu / Al is placed on the upper layer, the grooved Al coil is placed in the middle layer, the ungrooved Al coil is placed on the lower layer, and the Al surface of the second narrow strip coil of Cu / Al is placed in the groove of the grooved Al coil to obtain a first locally inlaid Cu / Al composite material;

[0012] The first locally inlaid Cu / Al composite material is cold-rolled to obtain a second locally inlaid Cu / Al composite material with the required thickness;

[0013] The second locally inlaid Cu / Al composite material is slit to obtain the finished product of the locally inlaid Cu / Al composite material.

[0014] Further, before the cold composite of the Cu coil and the Al coil, it also includes: respectively performing surface cleaning on the Cu coil and the Al coil to remove the oil stain on the material surface.

[0015] Further, the cold composite of the Cu coil and the Al coil includes: continuously composite the lower surface of the Cu coil and the upper surface of the Al coil after on-line surface polishing with a wire brush, the polished surface is the composite bonding surface, the cold composite deformation amount is 40%-50%, and the composite speed is 2-3 m / min.

[0016] Further, when slitting the first Cu / Al composite material, among them: the width of the first narrow strip coil of Cu / Al is determined according to actual requirements.

[0017] Further, when stretcher-leveling the first narrow strip coil of Cu / Al, among them: the correction of the side bend is not more than 3 mm / m.

[0018] Further, before providing the two coils of Al material, it also includes: performing surface cleaning on the second narrow strip coil of Cu / Al to remove the oil stain on the material surface.

[0019] Further, before locally grooving the surface of one of the two coils of Al coil stock, it further includes: brushing the surfaces of the two coils of Al coil stock to remove oil stains on the material surface.

[0020] Further, for locally grooving the surface of one of the two coils of Al coil stock, wherein: the position and width of the groove are determined according to actual requirements, and the depth of the groove is less than the thickness of the second Cu / Al narrow strip coil stock for positioning the second Cu / Al narrow strip coil stock.

[0021] Further, for warm compounding the second Cu / Al narrow strip coil stock, the grooved Al coil stock, and the ungrooved Al coil stock among the two coils of Al coil stock, wherein: the Al surface of the upper-layer second Cu / Al narrow strip coil stock, the upper and lower surfaces of the middle-layer grooved Al coil, and the upper surface of the lower-layer ungrooved Al coil are respectively polished online with a wire brush and then continuously warm-compounded. The warm-compounding deformation amount is 65%-75%, the compounding temperature is 400-500°C, and the compounding speed is 1.5-3 m / min.

[0022] Further, before cold rolling the first locally inlaid Cu / Al composite material, it further includes: dry-polishing and brushing the surface of the first locally inlaid Cu / Al composite material to make the surface of the first locally inlaid Cu / Al composite material consistent and oxide-free.

[0023] Further, for cold rolling the first locally inlaid Cu / Al composite material, wherein: the cold rolling deformation amount is not less than 10%, and the material surface is smooth.

[0024] Further, before slitting the second locally inlaid Cu / Al composite material, it further includes: cleaning the surface of the second locally inlaid Cu / Al composite material to remove oil stains on the material surface and keep the material smooth.

[0025] Further, it is characterized in that for slitting the second locally inlaid Cu / Al composite material, wherein: a film is covered on the surface of the second locally inlaid Cu / Al composite material to prevent scratching. The slitting width is 35-72 mm, and the slitting speed is 10-30 m / min.

[0026] According to another aspect of the present invention, there is provided a locally inlaid Cu / Al composite material, which is prepared by using the preparation method of the above-mentioned locally inlaid Cu / Al composite material. The locally inlaid Cu / Al composite material has a structure in which a Cu layer is inlaid into an Al layer. The thickness relationship between the Cu layer and the Al layer in the locally inlaid Cu / Al composite material is adjusted by the thickness of the Al coil used in the secondary temperature composite. The peel strength of the locally inlaid Cu / Al composite material reaches more than 50 N / mm.

[0027] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0028] By combining the preparation of Cu / Al composite narrow strips by one-time cold composite, pre-grooving of the base material Al coil, and secondary temperature composite, the present invention can increase the composite deformation amount of the copper-aluminum bonding area, so that a greater mechanical bonding force is obtained on the copper-aluminum bonding surface. At the same time, since the Cu surface is pre-coated with Al during the one-time cold composite, the problem of Cu surface oxidation at the copper-aluminum bonding interface under the action of temperature during the temperature composite stage can be completely solved. This not only makes the temperature composite more operable, but also eliminates the problem of poor peel strength caused by copper oxidation. In addition, under the action of the temperature composite temperature, copper and aluminum obtain a better interface bonding state, and this temperature enables the copper-aluminum composite material to obtain a very high and stable interface peel strength without the need for diffusion annealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent:

[0030] Figure 1 It is a schematic diagram of the morphology of the locally inlaid Cu / Al composite material according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those of ordinary skill in the art can make several deformations and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention. In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0032] An embodiment of the present invention provides a method for preparing a locally inlaid Cu / Al composite material, the method comprising:

[0033] S1, providing a Cu coil and an Al coil, and performing cold composite on the Cu coil and the Al coil to obtain a first Cu / Al composite material;

[0034] S2, slitting the first Cu / Al composite material to obtain a first Cu / Al narrow strip coil;

[0035] S3, straightening and leveling the first Cu / Al narrow strip coil to correct side bending to obtain a second Cu / Al narrow strip coil;

[0036] S4, providing two more Al coils, and performing local surface grooving on one of the two Al coils;

[0037] S5, performing warm composite on the second Cu / Al narrow strip coil, the grooved Al coil, and the ungrooved Al coil among the two Al coils, wherein the second Cu / Al narrow strip coil is placed on the upper layer, the grooved Al coil is placed on the middle layer, the ungrooved Al coil is placed on the lower layer, and the Al surface of the second Cu / Al narrow strip coil is placed in the groove of the middle layer Al coil, i.e., the grooved Al coil, to obtain a first locally inlaid Cu / Al composite material;

[0038] S6, performing cold rolling on the first locally inlaid Cu / Al composite material to obtain a second locally inlaid Cu / Al composite material with a required thickness;

[0039] S7, slitting the second locally inlaid Cu / Al composite material to obtain a finished product of the locally inlaid Cu / Al composite material.

[0040] In the embodiment of the present invention, the first Cu / Al narrow strip coil is first prepared by cold composite, so that a layer of Al is pre-coated on the surface of the Cu layer, and then it is embedded into the pre-grooved Al substrate during warm composite. By means of aluminum-aluminum bonding, oxidation of Cu is avoided, and by using the superposition of the two composite deformation amounts and the heat provided by warm composite, the problem of low interfacial peel strength of the Cu / Al composite material under the conventional single cold composite or hot composite process is solved. The interfacial peel strength can reach more than 50 N / mm, and it is not necessary to perform separate diffusion annealing on the Cu / Al composite material, thereby avoiding the generation of brittle phases at the copper-aluminum bonding interface. Another Al coil is used for adjusting the material thickness ratio, and thus a thicker finished material and different Cu layer thickness ratios can be obtained.

[0041] In some specific embodiments, before the cold lamination of the Cu coil stock and the Al coil stock, it further includes: respectively surface cleaning the Cu coil stock and the Al coil stock to remove the oil stain on the material surface. By surface cleaning to remove the oil, a clean material surface is obtained, thus providing guarantee for obtaining bonding strength subsequently.

[0042] Preferably, the surface cleaning of the Cu coil stock and the Al coil stock includes: removing the grease on the material surface through degreasing agent cleaning and mechanical cleaning. An environment-friendly degreasing agent is added to clean water, and the temperature of the clean water is maintained at 40°C - 60°C to enable the degreasing agent to play an efficient role. A soft brush is used to clean the surface of the raw material to remove the grease on the material surface, and then the surface of the material is cleaned with clean water to remove the residual environment-friendly degreasing agent on the material surface. Then the material is dried, and the drying temperature is 60°C - 80°C. This temperature can effectively remove the moisture on the material surface and avoid the problem of copper oxidation caused by too high temperature.

[0043] The Cu coil stock and the Al coil stock are arranged in sequence from top to bottom. In some specific embodiments, the cold lamination of the Cu coil stock and the Al coil stock includes: continuously laminating the lower surface of the Cu coil stock and the upper surface of the Al coil stock after on-line surface polishing with a wire brush. The polished surface is the lamination bonding surface, the cold lamination deformation amount is 40% - 50%, and the lamination speed is 2 - 3 m / min.

[0044] The first Cu / Al narrow strip coil stock is used for inlay lamination. In some specific embodiments, the first Cu / Al composite material is slit, wherein: the width of the first Cu / Al narrow strip coil stock is determined according to actual requirements, generally 8 - 12 mm.

[0045] Since the first Cu / Al narrow strip coil stock is used for the next-step embedded lamination, too large side bending will cause the narrow strip to not be effectively embedded, and the situation of lamination deviation may occur. In some specific embodiments, the first Cu / Al narrow strip coil stock is tension straightened, wherein: the corrected side bending is not more than 3 mm / m.

[0046] In some specific embodiments, before providing two more Al coil stocks, it further includes: surface cleaning the second Cu / Al narrow strip coil stock to remove the oil stain on the material surface. By surface cleaning to remove the oil, a clean material surface is obtained, thus providing guarantee for obtaining bonding strength subsequently.

[0047] Preferably, the surface of the second Cu / Al narrow strip coil is cleaned, including: removing the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environment-friendly degreasing agent to clean water, and keep the temperature of the clean water at 40°C - 60°C to enable the degreasing agent to play an efficient role. Use a soft brush to brush the material surface to remove the grease on the material surface, and then use clean water to wash the material surface to remove the residual environment-friendly degreasing agent on the material surface. Then dry the material, and the drying temperature is 60°C - 80°C. This temperature can effectively remove the moisture on the material surface and avoid the problem of copper oxidation caused by too high temperature.

[0048] In some specific embodiments, before performing surface partial grooving on one of the two Al coil materials, it further includes: cleaning the surfaces of the two Al coil materials to remove the oil stain on the material surface. By removing oil through surface cleaning, a clean material surface is obtained, thus providing guarantee for obtaining good bonding strength subsequently.

[0049] Preferably, the surfaces of the two Al coil materials are cleaned, including: removing the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environment-friendly degreasing agent to clean water, and keep the temperature of the clean water at 40°C - 60°C. Use a soft brush to brush the material surface to remove the grease on the material surface, and then use clean water to wash the material surface to remove the residual environment-friendly degreasing agent on the material surface. Then dry the material, and the drying temperature is 60°C - 80°C.

[0050] The grooving on the surface of the Al coil material is used for the positioning of inlaying and compounding. In some specific embodiments, surface partial grooving is performed on one of the two Al coil materials, where: the position and width of the grooving are determined according to actual requirements. The grooving is a shallow groove, and the depth of the grooving is less than the thickness of the second Cu / Al narrow strip coil, so as to be used for positioning the second Cu / Al narrow strip coil.

[0051] In some specific embodiments, warm compounding is performed on the second Cu / Al narrow strip coil, the grooved Al coil material, and the ungrooved Al coil material, where: use a steel wire brush to perform on-line polishing on the Al surface of the upper-layer second Cu / Al narrow strip coil, the upper and lower surfaces of the middle-layer grooved Al coil, and the upper surface of the lower-layer ungrooved Al coil respectively, and then perform continuous warm compounding. The warm compounding deformation amount is 65% - 75%, the compounding temperature is 400 - 500°C, and the compounding speed is 1.5 - 3 m / min. Under the action of the warm compounding temperature, copper and aluminum obtain a better interface bonding state, and this temperature enables the copper-aluminum composite material to obtain a very high and stable interface peel strength without the need for diffusion annealing.

[0052] Since the fresh aluminum surface will react with water in a series of reactions, resulting in a blackened surface. In some specific embodiments, before cold rolling the first partial inlaid Cu / Al composite material, surface treatment is also included to facilitate the bonding between materials. The surface treatment specifically includes: dry polishing and cleaning the surface of the first partial inlaid Cu / Al composite material. Dry polishing can make the material surface uniform and is more conducive to removing the oxidation on the material surface, so that the surface of the first partial inlaid Cu / Al composite material is uniform and oxide-free.

[0053] Since the fresh aluminum surface will react with water in a series of reactions, resulting in a blackened surface. Preferably, a 120-mesh to 300-mesh abrasive belt wheel is used to continuously polish the material surface, and the material surface is avoided from contacting with water during the continuous polishing process to obtain a first partial inlaid Cu / Al composite material with a uniform and oxide-free surface.

[0054] Since the dry polishing surface used is relatively rough, too small a rolling force is not conducive to forming a smooth rolling surface and is also not conducive to correcting the thickness tolerance of the required material. In some specific embodiments, cold rolling is performed on the first partial inlaid Cu / Al composite material, where: the cold rolling deformation is not less than 10%, and the material surface is smooth.

[0055] In some specific embodiments, before slitting the second partial inlaid Cu / Al composite material, it also includes: surface cleaning the second partial inlaid Cu / Al composite material to remove the oil stain on the material surface and maintain the original smoothness of the material, thereby providing guarantee for obtaining the bonding force in the subsequent process.

[0056] Preferably, surface cleaning of the second partial inlaid Cu / Al composite material includes: removing the grease on the material surface by degreasing agent cleaning and mechanical brushing. An environmentally friendly degreasing agent is added to the clear water, and the temperature of the clear water is maintained at 40°C - 60°C. A nylon soft brush is used to brush the material surface to remove the grease on the material surface, and then the material surface is cleaned with clear water to remove the residual environmentally friendly degreasing agent on the material surface. Then, passivation treatment is performed on the copper surface with a passivating agent to prevent oxidation, and then the material is dried, and the drying temperature is 60°C - 80°C.

[0057] In some specific embodiments, it is characterized in that slitting is performed on the second partial inlaid Cu / Al composite material, where: a film is covered on the surface of the second partial inlaid Cu / Al composite material after slitting for protection to prevent the material surface from being scratched due to interlayer friction during winding. The slitting width is 35 - 72 mm, and the slitting speed is 10 - 30 m / min.

[0058] An embodiment of the present invention also provides a locally inlaid Cu / Al composite material, which is prepared by using the preparation method of the locally inlaid Cu / Al composite material described above. As Figure 1 shown, the locally inlaid Cu / Al composite material has a structure in which the Cu layer is inlaid into the Al layer, that is, the copper is locally embedded in the matrix aluminum. Specifically, with Al as the base material, grooves are opened at corresponding positions and Cu is inlaid. Preferably, the above Cu layer is T2 and the Al layer is 1060. The raw materials are easy to obtain and have high economy, and at the same time can better meet the requirements of peel strength; the thickness relationship between the Cu layer and the Al layer in the locally inlaid Cu / Al composite material is adjusted by the thickness of the Al coil used in the secondary temperature composite; the peel strength of the locally inlaid Cu / Al composite material reaches more than 50 N / mm.

[0059] In the locally inlaid Cu / Al composite material and its preparation method in the above embodiment of the present invention, by combining the preparation of the Cu / Al composite narrow strip by one-time cold composite, pre-grooving the base material Al coil, and secondary temperature composite, the composite deformation amount of the copper-aluminum bonding area can be increased, and a greater mechanical bonding force can be obtained on the copper-aluminum bonding surface, solving the problem of low peel strength of the copper-aluminum inlaid composite material produced by the conventional cold and hot composite methods; at the same time, since the Cu surface is pre-compounded with Al during the one-time cold composite, the oxidation problem of the Cu surface as the copper-aluminum bonding interface under the action of temperature during the temperature composite stage can be completely solved, which not only makes the temperature composite more operable, but also eliminates the problem of poor peel strength caused by copper oxidation, and avoids the copper oxidation protection problem when copper is directly temperature-compounded with aluminum. In addition, under the action of the temperature composite temperature, copper and aluminum obtain a better interface bonding state, and the temperature of the temperature composite enables the copper-aluminum composite material to obtain a very high and stable interface peel strength without further diffusion annealing, and the peel strength can reach more than 50 N / mm, which is greatly improved compared with the peel strength of the Cu / Al composite material in the prior art.

[0060] A specific embodiment is used to illustrate the locally inlaid Cu / Al composite material and its preparation method in the embodiment of the present invention in more detail.

[0061] Example 1

[0062] This embodiment provides a locally inlaid Cu / Al composite material and its preparation method, including:

[0063] S1. Surface clean the following raw materials: Cu coil stock with a width of 160 mm and a thickness of 5 mm, and Al coil stock with a width of 160 mm and a thickness of 1.5 mm. Remove the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environmentally friendly degreasing agent to clean water, keep the temperature of the clean water at 40 °C, and use a soft brush to brush the material surface to remove the grease on the material surface. Then, use clean water to clean the material surface to remove the residual environmentally friendly degreasing agent on the material surface. After that, dry the material, and the drying temperature is 60 °C.

[0064] S2. Cold-compound the surface-cleaned raw materials: Cu coil stock with a width of 160 mm and a thickness of 5 mm, and Al coil stock with a width of 160 mm and a thickness of 1.5 mm. Continuously compound the lower surface of the Cu coil stock and the upper surface of the Al coil stock after online surface polishing with a wire brush. The polished surface is the composite bonding surface. The cold-compound thickness is 3.9 mm, the cold-compound deformation is 40%, and the compounding speed is 2 m / min to obtain the first Cu / Al composite material.

[0065] S3. Slit the first Cu / Al composite material with a width of 160 mm and a thickness of 3.9 mm obtained by cold compounding. The slitting width is 8 mm to obtain the first Cu / Al narrow strip coil stock.

[0066] S4. Stretch-levelling the first Cu / Al narrow strip coil stock with a width of 8 mm and a thickness of 3.9 mm obtained by slitting, and correct the side bend to ≤ 3 mm / m to obtain the second Cu / Al narrow strip coil stock.

[0067] S5. Surface clean the second Cu / Al narrow strip coil stock obtained by stretch-levelling. Remove the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environmentally friendly degreasing agent to clean water, keep the temperature of the clean water at 40 °C, and use a soft brush to brush the material surface to remove the grease on the material surface. Then, use clean water to clean the material surface to remove the residual environmentally friendly degreasing agent on the material surface. After that, dry the material, and the drying temperature is 60 °C.

[0068] S6. Surface clean the following 2 rolls of Al raw materials: Al coil stock with a width of 160 mm and a thickness of 7.15 mm. Remove the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environmentally friendly degreasing agent to clean water, keep the temperature of the clean water at 40 °C, and use a soft brush to brush the material surface to remove the grease on the material surface. Then, use clean water to clean the material surface to remove the residual environmentally friendly degreasing agent on the material surface. After that, dry the material, and the drying temperature is 60 °C.

[0069] S7. For one of the cleaned Al coil stocks with a width of 160 mm and a thickness of 7.15 mm, use a grooving machine to open two symmetric grooves on the Al coil stock surface. The groove spacing is 80 mm, the groove width is 8 mm, and the groove depth is 0.75 mm.

[0070] S8. The prepared second Cu / Al narrow strip coil (8 mm wide × 3.9 mm thick), the slotted Al coil after S7, and the Al coil after S6 brushing are subjected to warm composite. Among them, the second Cu / Al narrow strip coil is placed on the upper layer, the slotted Al coil is placed in the middle layer, and the unslotted Al coil is placed on the lower layer. The Al surface of the second Cu / Al narrow strip coil is placed in the slot of the middle layer Al coil. After online polishing the Al surface of the upper layer Cu / Al narrow strip, the upper and lower surfaces of the middle layer slotted Al coil, and the upper surface of the lower layer Al coil with a wire brush, continuous warm composite is carried out. The warm composite deformation is 75%, the composite temperature is 400 °C, and the composite speed is 1.5 m / min to obtain the first partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 4.36 mm.

[0071] S9. The first partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 4.36 mm obtained by warm composite is subjected to surface dry polishing and brushing. The surface of the material is continuously polished with a 120-mesh sand belt wheel to avoid contact between the material surface and water, and a Cu / Al composite material with a consistent and non-oxidized surface is obtained.

[0072] S10. The first partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 4.36 mm after surface dry polishing is subjected to cold rolling. The cold rolling deformation is 31.2% to obtain the second partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm, and the surface of the material is smooth.

[0073] S11. The second partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm after cold rolling is subjected to surface cleaning. The grease on the material surface is removed by degreasing agent cleaning and mechanical brushing. An environmentally friendly degreasing agent is added to the clear water, and the temperature of the clear water is maintained at 40 °C. The surface of the material is brushed with a nylon soft brush to remove the grease on the material surface, and then the surface of the material is washed with clear water to remove the residual environmentally friendly degreasing agent on the material surface. Then, the copper surface is passivated with a passivating agent to prevent oxidation, and then the material is dried at a temperature of 60 °C.

[0074] S12. The second partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm after surface cleaning is slit. The slit width is 35 mm, and the slit speed is 10 m / min. The positioning dimension of the copper layer is determined according to requirements, and the surface of the material is covered with a film to prevent scratching.

[0075] Finally, a finished product of the partially embedded Cu / Al composite material with a size of 35 mm × 3 mm is obtained in this embodiment. The width of the copper layer is 8 mm, and the peel strength of the copper-aluminum interface is greater than 50 N / mm.

[0076] Example 2

[0077] This embodiment provides a locally inlaid Cu / Al composite material and a preparation method thereof, including:

[0078] S1. For the following raw materials: Cu coil with a width of 160 mm and a thickness of 5 mm, and Al coil with a width of 160 mm and a thickness of 1.5 mm, perform surface cleaning. Remove the grease on the material surface through degreasing agent cleaning and mechanical cleaning. Add an environment-friendly degreasing agent to clear water, keep the temperature of the clear water at 50 °C, use a soft brush to clean the material surface to remove the grease on the material surface, then use clear water to clean the material surface to remove the residual environment-friendly degreasing agent on the material surface, and then dry the material, with the drying temperature being 70 °C.

[0079] S2. Cold-compound the raw materials after surface cleaning: Cu coil with a width of 160 mm and a thickness of 5 mm, and Al coil with a width of 160 mm and a thickness of 1.5 mm. Continuously compound the lower surface of the Cu coil and the upper surface of the Al coil after on-line surface polishing with a wire brush. The polished surface is the composite bonding surface. The cold-compound thickness is 3.5 mm, the cold-compound deformation amount is 46.2%, and the compounding speed is 2.5 m / min to obtain the first Cu / Al composite material.

[0080] S3. Cut the first Cu / Al composite material with a width of 160 mm and a thickness of 3.5 mm obtained by cold compounding into strips, with the strip width being 10 mm, to obtain the first Cu / Al narrow strip coil.

[0081] S4. Straighten and correct the 10 mm-wide × 3.5 mm-thick first Cu / Al narrow strip coil obtained by cutting, and correct the side bend to ≤ 3 mm / m to obtain the second Cu / Al narrow strip coil.

[0082] S5. Perform surface cleaning on the second Cu / Al narrow strip coil obtained by straightening and correction. Remove the grease on the material surface through degreasing agent cleaning and mechanical cleaning. Add an environment-friendly degreasing agent to clear water, keep the temperature of the clear water at 50 °C, use a soft brush to clean the material surface to remove the grease on the material surface, then use clear water to clean the material surface to remove the residual environment-friendly degreasing agent on the material surface, and then dry the material, with the drying temperature being 70 °C.

[0083] S6. For the following 2 rolls of Al raw materials: Al coil with a width of 160 mm and a thickness of 6.4 mm, perform surface cleaning. Remove the grease on the material surface through degreasing agent cleaning and mechanical cleaning. Add an environment-friendly degreasing agent to clear water, keep the temperature of the clear water at 50 °C, use a soft brush to clean the material surface to remove the grease on the material surface, then use clear water to clean the material surface to remove the residual environment-friendly degreasing agent on the material surface, and then dry the material, with the drying temperature being 70 °C.

[0084] S7. Take one of the cleaned Al coils, with a width of 160 mm and a thickness of 6.4 mm, and use a grooving machine to cut two symmetric grooves on the surface of the Al coil. The groove spacing is 80 mm, the groove width is 10 mm, and the groove depth is 0.75 mm.

[0085] S8. Perform warm composite of the prepared second Cu / Al narrow strip coil with a width of 10 mm and a thickness of 3.5 mm, the Al coil after grooving in S7, and the Al coil after brushing in S6. Among them, the second Cu / Al narrow strip coil is placed on the upper layer, the grooved Al coil is placed in the middle layer, and the ungrooved Al coil is placed on the lower layer. The Al surface of the second Cu / Al narrow strip coil is placed in the grooves of the middle layer Al coil. After using a wire brush to perform on-line polishing on the Al surface of the upper layer Cu / Al narrow strip, the upper and lower surfaces of the middle layer grooved Al coil, and the upper surface of the lower layer Al coil, perform continuous warm composite. The warm composite deformation is 70%, the composite temperature is 450 °C, and the composite speed is 2.5 m / min to obtain the first partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 4.67 mm.

[0086] S9. Perform surface dry polishing and brushing on the first partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 4.67 mm obtained by warm composite. Use an 180-mesh sand belt wheel to continuously polish the surface of the material to avoid contact between the material surface and water, and obtain a Cu / Al composite material with a consistent and non-oxidized surface.

[0087] S10. Perform cold rolling on the first partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 4.67 mm after surface dry polishing. The cold rolling deformation is 35.8% to obtain the second partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm, and the surface of the material is smooth.

[0088] S11. Perform surface cleaning on the second partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm after cold rolling. Remove the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environmentally friendly degreasing agent to the clear water, and keep the temperature of the clear water at 50 °C. Use a nylon soft brush to brush the surface of the material to remove the grease on the material surface. Then use clear water to clean the surface of the material to remove the residual environmentally friendly degreasing agent on the material surface. Then use a passivating agent to passivate the copper surface to prevent oxidation. Then dry the material, and the drying temperature is 70 °C.

[0089] S12. Perform slitting on the second partially embedded Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm after surface cleaning. The slitting width is 56 mm, and the slitting speed is 20 m / min. The positioning dimension of the copper layer is determined according to requirements, and the surface of the material is covered with a film to prevent scratching.

[0090] In this embodiment, a finished product of a locally inlaid Cu / Al composite material with a size of 56 mm × 3 mm is finally obtained. The span of the copper layer is 10 mm, and the peel strength of the copper-aluminum interface is greater than 50 N / mm.

[0091] Example 3

[0092] This embodiment provides a locally inlaid Cu / Al composite material and its preparation method, including:

[0093] S1. For the following raw materials: a Cu coil with a width of 160 mm and a thickness of 5 mm, and an Al coil with a width of 160 mm and a thickness of 1.5 mm, perform surface cleaning. Remove the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environment-friendly degreasing agent to clear water, keep the temperature of the clear water at 60 °C, and use a soft brush to brush the material surface to remove the grease on the material surface. Then, use clear water to clean the material surface to remove the residual environment-friendly degreasing agent on the material surface. After that, dry the material, and the drying temperature is 80 °C.

[0094] S2. Cold-compound the raw materials after surface cleaning: a Cu coil with a width of 160 mm and a thickness of 5 mm, and an Al coil with a width of 160 mm and a thickness of 1.5 mm. Continuously compound the lower surface of the Cu coil and the upper surface of the Al coil after online surface polishing with a wire brush. The polished surface is the composite bonding surface. The cold-compound thickness is 3.25 mm, the cold-compound deformation is 50%, and the compounding speed is 3 m / min to obtain the first Cu / Al composite material.

[0095] S3. Cut the first Cu / Al composite material with a width of 160 mm and a thickness of 3.25 mm obtained by cold compounding into strips with a width of 12 mm to obtain the first Cu / Al narrow strip coil.

[0096] S4. Straighten the first Cu / Al narrow strip coil with a width of 10 mm and a thickness of 3.25 mm obtained by cutting, and correct the side bend to ≤ 3 mm / m to obtain the second Cu / Al narrow strip coil.

[0097] S5. Perform surface cleaning on the second Cu / Al narrow strip coil obtained by straightening. Remove the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environment-friendly degreasing agent to clear water, keep the temperature of the clear water at 60 °C, and use a soft brush to brush the material surface to remove the grease on the material surface. Then, use clear water to clean the material surface to remove the residual environment-friendly degreasing agent on the material surface. After that, dry the material, and the drying temperature is 80 °C.

[0098] S6. Take the following two coils of Al raw material: Al coil stock with a width of 160 mm and a thickness of 5.95 mm, and conduct surface cleaning. Remove the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environmentally friendly degreasing agent to clean water, keep the temperature of the clean water at 60 °C, and use a soft brush to brush the material surface to remove the grease on the material surface. Then, use clean water to wash the material surface to remove the residual environmentally friendly degreasing agent on the material surface. After that, dry the material, and the drying temperature is 80 °C.

[0099] S7. Take one of the cleaned Al coil stocks with a width of 160 mm and a thickness of 5.95 mm, and use a grooving machine to open two grooves at symmetric positions on the Al coil stock surface. The groove spacing is 80 mm, the groove width is 12 mm, and the groove depth is 0.75 mm.

[0100] S8. Conduct warm composite of the prepared second Cu / Al narrow strip coil stock with a width of 12 mm and a thickness of 3.25 mm, the Al coil stock after grooving in S7, and the Al coil stock after cleaning in S6. Among them, the second Cu / Al narrow strip coil stock is placed on the upper layer, the grooved Al coil stock is placed on the middle layer, and the ungrooved Al coil stock is placed on the lower layer. The Al surface of the second Cu / Al narrow strip coil stock is placed in the groove of the middle layer Al coil stock. After using a wire brush to conduct on-line polishing on the Al surface of the upper layer Cu / Al narrow strip, the upper and lower surfaces of the middle layer grooved Al coil, and the upper surface of the lower layer aluminum coil, conduct continuous warm composite. The warm composite deformation amount is 65%, the composite temperature is 500 °C, and the composite speed is 3 m / min to obtain the first partially inlaid Cu / Al composite material with a width of 160 mm and a thickness of 5.04 mm.

[0101] S9. Conduct surface dry polishing and cleaning on the first partially inlaid Cu / Al composite material with a width of 160 mm and a thickness of 5.04 mm obtained by warm composite. Use a 300-mesh sand belt wheel to continuously polish the material surface to avoid contact between the material surface and water, and obtain a Cu / Al composite material with a consistent and non-oxidized surface.

[0102] S10. Conduct cold rolling on the first partially inlaid Cu / Al composite material with a width of 160 mm and a thickness of 5.04 mm after surface dry polishing. The cold rolling deformation amount is 40.5% to obtain the second partially inlaid Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm, and the material surface is smooth.

[0103] S11. Clean the surface of the second partial inlaid Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm after cold rolling. Remove the grease on the material surface through degreasing agent cleaning and mechanical brushing. Add an environmentally friendly degreasing agent to clean water, keep the temperature of the clean water at 60 °C, and use a nylon soft brush to brush the material surface to remove the grease on the material surface. Then, clean the material surface with clean water to remove the residual environmentally friendly degreasing agent on the material surface. After that, passivate the copper surface with a passivating agent to prevent oxidation. Then, dry the material, and the drying temperature is 80 °C.

[0104] S12. Cut the second partial inlaid Cu / Al composite material with a width of 160 mm and a thickness of 3.0 mm after surface cleaning. The cutting width is 72 mm, the cutting speed is 30 m / min, and the positioning dimension of the copper layer is determined according to requirements. Cover the material surface with a film to prevent scratching.

[0105] In this embodiment, the final product of the partial inlaid Cu / Al composite material is obtained with a size of 72 mm × 3 mm, the width of the copper layer is 12 mm, and the peel strength of the copper-aluminum interface is greater than 50 N / mm.

[0106] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which do not affect the essence of the present invention. The above preferred features can be combined arbitrarily without conflict.

Claims

1. A preparation method of a local inlaid Cu / Al composite material, characterized in that, it includes: providing a Cu coil and an Al coil, and performing cold composite on the Cu coil and the Al coil to obtain a first Cu / Al composite material; slitting the first Cu / Al composite material to obtain a first Cu / Al narrow strip coil; performing tension leveling on the first Cu / Al narrow strip coil to correct side bending and obtain a second Cu / Al narrow strip coil; providing two more Al coils, and performing local surface grooving on one of the two Al coils; wherein, the depth of the grooving is less than the thickness of the second Cu / Al narrow strip coil for positioning the second Cu / Al narrow strip coil; performing warm composite on the second Cu / Al narrow strip coil, the grooved Al coil, and the ungrooved Al coil among the two Al coils. Among them, the second Cu / Al narrow strip coil is placed on the upper layer, the grooved Al coil is placed in the middle layer, the ungrooved Al coil is placed on the lower layer, the Al surface of the second Cu / Al narrow strip coil is placed in the groove of the grooved Al coil, the warm composite deformation amount is 65%-75%, and the composite temperature is 400-500°C to obtain a first local inlaid Cu / Al composite material; performing cold rolling on the first local inlaid Cu / Al composite material to obtain a second local inlaid Cu / Al composite material with the required thickness; slitting the second local inlaid Cu / Al composite material to obtain the finished product of the local inlaid Cu / Al composite material.

2. The preparation method of the local inlaid Cu / Al composite material according to claim 1, characterized in that, before performing cold composite on the Cu coil and the Al coil, it further includes: respectively performing surface brushing on the Cu coil and the Al coil to remove the oil stain on the material surface.

3. The preparation method of the local inlaid Cu / Al composite material according to claim 1, characterized in that, performing cold composite on the Cu coil and the Al coil includes: continuously composite the lower surface of the Cu coil and the upper surface of the Al coil after online surface polishing with a wire brush, and the polished surface is the composite bonding surface. The cold composite deformation amount is 40%-50%, and the composite speed is 2-3 m / min.

4. The preparation method of the local inlaid Cu / Al composite material according to claim 1, characterized in that, when slitting the first Cu / Al composite material, wherein: the width of the first Cu / Al narrow strip coil is determined according to actual requirements.

5. The preparation method of the local inlaid Cu / Al composite material according to claim 1, characterized in that, when performing tension leveling on the first Cu / Al narrow strip coil, wherein: the corrected side bending is not more than 3 mm / m.

6. The preparation method of the local inlaid Cu / Al composite material according to claim 1, characterized in that, Before re-providing the two coils of Al coil stock, it further includes: surface cleaning the second Cu / Al narrow strip coil stock to remove oil stains on the material surface.

7. The method for preparing a partially inlaid Cu / Al composite material according to claim 1, characterized in that, before performing surface partial grooving on one of the two coils of Al coil stock, it further includes: surface cleaning the two coils of Al coil stock to remove oil stains on the material surface.

8. The method for preparing a partially inlaid Cu / Al composite material according to claim 1, characterized in that, performing warm composite on the second Cu / Al narrow strip coil stock, the grooved Al coil stock, and the ungrooved Al coil stock among the two coils of Al coil stock, wherein: using a wire brush to perform on-line polishing on the Al surface of the upper-layer second Cu / Al narrow strip coil stock, the upper and lower surfaces of the middle-layer grooved Al coil, and the upper surface of the lower-layer ungrooved Al coil respectively, and then performing continuous warm composite, and the composite speed is 1.5 - 3 m / min.

9. A partially inlaid Cu / Al composite material, characterized in that, it is prepared by using the method for preparing a partially inlaid Cu / Al composite material according to any one of claims 1 - 8. The partially inlaid Cu / Al composite material has a structure in which the Cu layer is inlaid into the Al layer. The thickness relationship between the Cu layer and the Al layer in the partially inlaid Cu / Al composite material is adjusted by the thickness of the Al coil used during the secondary warm composite. The peel strength of the partially inlaid Cu / Al composite material reaches more than 50 N / mm.

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