Aluminum-based multi-layer composite board and preparation method thereof

Abstract

The invention discloses an aluminum-based multi-layer composite material and a preparation method thereof, and relates to an aluminum-based composite material which is characterized in that molten aluminum liquid and a metal simple substance plate or a metal alloy plate are subjected to single-side or double-side solid-liquid casting rolling compounding to form an aluminum-based composite plate; and then the molten aluminum liquid serves as an intermediate, the aluminum-based composite board and a metal simple substance board or a metal alloy board or the aluminum-based composite board are subjected to double-face solid-liquid cast-rolling compounding, and the aluminum-based multi-layer composite board is obtained after one-time or multiple-time repeating. According to the technical scheme, the molten aluminum liquid serves as an intermediate medium, and multi-layer metallurgical bonding of dissimilar metal materials is achieved through the solid-liquid cast rolling technology. The high diffusivity and wettability of molten aluminum serve as the core, under the conditions that the melting point of a base material is higher than that of aluminum, and the contact angle is smaller than 90 degrees, metal elementary substances or alloy or composite boards are stacked layer by layer through a continuous cast-rolling technology, and an alternately-distributed metal-aluminum-metal multi-layer structure is formed.

Description

Technical Field

[0001] The invention relates to an aluminum-based multilayer eutectic composite material. Background Art

[0002] Molten aluminum liquid exhibits high fluidity and chemical activity at high temperatures. The diffusion coefficient of molten aluminum liquid is about 10 -9 ~10 -8 m² / s, and possesses extremely strong diffusivity. Upon contact with highly wettable materials, molten aluminum rapidly diffuses and undergoes an interfacial reaction, allowing for a solid-liquid composite between the molten aluminum and these materials. Molten aluminum can be considered a "binder" for highly wettable materials, allowing for metallurgical composites of two highly wettable materials that are difficult or costly to directly composite.

[0003] Furthermore, molten aluminum reacts with highly wettable materials at the interface, theoretically allowing these materials to be metallurgically bonded layer by layer through the molten aluminum. Each layer can be different or identical. The number and thickness of multi-layer composite materials that can be bonded is limited only by the size of the existing equipment and is theoretically unlimited. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies and provides an aluminum-based multilayer composite sheet and its preparation method. Using molten aluminum as an intermediate medium, a solid-liquid casting and rolling process is employed to achieve multilayer metallurgical bonding of dissimilar metal materials. Utilizing the high diffusivity and wettability of molten aluminum, and under the conditions of a substrate with a higher melting point than aluminum and a contact angle less than 90°, a continuous casting and rolling process is used to layer single metal, alloy, or composite sheets, forming an alternating "metal-aluminum-metal" multilayer structure.

[0005] In order to solve the above technical problems, the present invention solves them through the following technical solutions: an aluminum-based multi-layer composite plate, molten aluminum liquid and a metal element plate or a metal alloy plate are solid-liquid cast-rolled on one side or both sides to form an aluminum-based composite plate; then, using molten aluminum liquid as an intermediate, the aluminum-based composite plate is solid-liquid cast-rolled on both sides with a metal element plate or a metal alloy plate or an aluminum-based composite plate, and the aluminum-based multi-layer composite plate is obtained by repeating the process once or multiple times.

[0006] In the above technical solution, preferably, the metal single-element plate or the metal alloy plate has a melting point higher than aluminum and a contact angle θ less than 90°.

[0007] In the above technical solution, preferably, cooling is performed during solid-liquid casting and the cooling rate is between 300°C / s and 1000°C / s.

[0008] In the above technical solution, preferably, when the molten aluminum liquid is the intermediate, the molten aluminum liquid contacts the non-aluminum base surface of the aluminum-based composite plate during solid-liquid casting.

[0009] In the above technical solution, preferably, during solid-liquid casting, a eutectic reaction between aluminum and other metals occurs.

[0010] A method for manufacturing an aluminum-based multi-layer composite plate comprises the following steps: step A: adding an aluminum ingot to a smelting furnace for smelting treatment, heating it to 720° C. to 750° C. to obtain molten aluminum liquid, pouring the molten aluminum liquid into a holding furnace, controlling the temperature at 660° C. to 750° C., and holding it for 20 min to 60 min; step B: the aluminum liquid after holding it for 20 min to 60 min is degassed and filtered through an online treatment device; step C: the metal single-element plate or metal alloy plate is unwound on a decoiler, and then transported to a twin-roll casting and rolling device, and under the action of tension, it enters the casting and rolling zone close to the lower roller; step D: injecting aluminum liquid in a temperature range of 660° C. to 750° C. into a die-casting gap under static pressure through a casting nozzle, with an injection width equal to the plate width; step E: upper and lower rollers cool the molten aluminum liquid and the metal single-element plate or metal alloy plate and perform solid-liquid casting to form an aluminum-based composite plate billet coil; step F: uncoiling the aluminum-based composite plate billet on the decoiler, and then The metal single-element plate or metal alloy plate or aluminum-based composite plate blank is unwound on an uncoiler and then transported together to a twin-roll casting and rolling device. Under the action of tension, they all enter the casting and rolling zone close to the lower roller; Step G: Aluminum liquid in a temperature range of 660°C to 750°C is injected into the die-casting gap under static pressure through a casting nozzle, and the injection width is the plate width; Step H: Repeat Step F and Step G until an aluminum-based multi-layer composite plate blank coil with the required number of layers is obtained; Step I: The aluminum-based multi-layer composite plate blank coil is placed in an annealing furnace for homogenization annealing at a heating temperature of 200°C to 600°C and an annealing time of 2h to 30h, and an aluminum-based multi-layer composite plate is obtained after annealing.

[0011] In the above technical solution, preferably, after step E and step G, the aluminum-based composite slab coil is cold rolled to reduce the thickness of the aluminum-based composite slab coil.

[0012] In the above technical solution, preferably, after cold rolling, the aluminum-based composite slab coil is placed in an annealing furnace for homogenization annealing, the heating temperature is 200° C. to 600° C., and the annealing time is 2 h to 30 h.

[0013] In the above technical solution, preferably, the metal element sheet or alloy sheet is physically cleaned or chemically cleaned to remove the surface metal oxide layer before uncoiling.

[0014] In the above technical solution, preferably, the metal single-element plate or metal alloy plate or aluminum-based composite plate coil is heated before entering the casting and rolling zone, and the heating temperature is between 50°C and 250°C.

[0015] In the above technical solution, preferably, the casting and rolling zone is filled with an inert gas protective atmosphere.

[0016] In the above technical solution, preferably, the cooling rate in the casting and rolling zone is 300°C / s to 1000°C / s.

[0017] In the above technical solution, preferably, after step E and step G, the aluminum-based composite slab coil is placed in an annealing furnace for homogenization annealing, the heating temperature is 200° C. to 600° C., and the annealing time is 2 h to 30 h.

[0018] The core technical feature of this application is the layering of different metal materials through a progressive lamination mechanism using molten aluminum. Metal or alloy plates with a higher melting point than aluminum and good wettability with the molten aluminum are selected to ensure that the substrate remains solid during the lamination process. The molten aluminum acts as an intermediate layer, acting as a "binder," achieving metallurgical bonding with both upper and lower layers during the solid-liquid casting process. Through repeated casting and rolling processes, the laminated plates can be used as a new substrate for further lamination with molten aluminum and other materials. Theoretically, the number of layers can be increased indefinitely, forming an alternating "metal-aluminum-metal-aluminum-..." structure.

[0019] This application utilizes the technical effect of a solid-liquid reaction between molten aluminum and a high-melting-point metal or alloy sheet during the cooling process of the casting and rolling process, forming a continuous eutectic layer structure. The molten aluminum and the metal or metal alloy sheet are fully wetted under the condition of a contact angle θ < 90°, and atomic diffusion forms a eutectic phase, achieving metallurgical-grade interface bonding, rather than the mechanical bonding of traditional composite materials. The eutectic layer has a gradient distribution of composition from the aluminum matrix to the metal sheet, alleviating the difference in thermal expansion coefficients between the dissimilar materials and significantly improving thermal fatigue resistance. The gradient structure of the eutectic interface effectively alleviates the thermal expansion mismatch problem of the dissimilar materials, allowing the composite material to exhibit excellent stability in high-temperature and low-temperature alternating or corrosive media environments, solving the problem of a sudden reduction in the service life of traditional composite materials due to interface failure. The rapid cooling environment reduces the reaction time and suppresses the formation of coarse intermetallic compounds, making it easier to form a refined eutectic structure with an average size of about 1μm, improving the interface strength and toughness. The aluminum liquid acts as an intermediate layer, providing good interface bonding, making it a perfect "adhesive" for some highly wettable metal materials. The above technical features are also the application basis of this application.

[0020] The preparation process of this application revolves around the core links of "melting-casting-compounding-annealing" or "melting-casting-compounding-cold rolling-annealing". In the aluminum liquid processing stage, the aluminum ingot is melted and then kept still, degassed and filtered to ensure the purity and fluidity of the aluminum liquid. In the initial compounding stage, the substrate and the aluminum liquid are compounded in a single layer by double-roller casting and rolling to form an aluminum-based composite slab coil. In the multi-layer expansion stage, by repeating the uncoiling-casting-rolling operation, the metal material and the aluminum liquid are superimposed layer by layer to construct a multi-layer structure. If the substrate is too thick after multiple compounding treatments, the substrate can also be cold rolled first to reduce the thickness. This requires precise coordination with the annealing step to determine the annealing timing and annealing process to ensure the interface bonding of each layer of the final composite plate.

[0021] This application utilizes an integrated solid-liquid casting and rolling process, integrating aluminum liquid casting and rolling into a single process. This allows for simultaneous lamination and forming, while also enabling continuous production. Through the cyclic unwinding and lamination of coils, it supports the continuous production of kilometer-long lengths. This application boasts high material utilization, minimal waste, and low unit energy consumption, resulting in a substantial improvement in production efficiency. It is fully applicable to large-scale production.

[0022] The most important thing is that this application solves the problem of the difficulty in combining dissimilar metals. The method of this application can easily combine metals with different physical properties. Through the innovative combination of dynamic wetting of molten aluminum liquid and solid-liquid casting and rolling process, a revolutionary solution is provided for solving the problem of combining dissimilar metals. Its core value lies in breaking through the material limitations and performance bottlenecks of traditional composite technology, providing the possibility for large-scale application of traditional difficult-to-combine systems such as aluminum / copper, aluminum / magnesium, aluminum / titanium, etc., and bringing disruptive changes to the fields of aerospace, new energy vehicles, and high-end equipment manufacturing. This application supports the alternating composite of multiple layers of dissimilar metals, such as "copper-aluminum-titanium", "stainless steel-aluminum-titanium", "titanium, aluminum-stainless steel-titanium", etc., and can simultaneously achieve multifunctional integration such as lightweight, high strength, and high conductivity.

[0023] Compared with the existing technology, the technical solution of this application uses molten aluminum liquid as an intermediate medium and utilizes a solid-liquid casting and rolling process to achieve multi-layer metallurgical bonding of dissimilar metal materials. With the high diffusivity and wettability of aluminum liquid as the core, under the conditions that the melting point of the substrate is higher than that of aluminum and the contact angle is less than 90°, metal single substances, alloys or composite plates are stacked layer by layer through a continuous casting and rolling process to form an alternating "metal-aluminum-metal" multi-layer structure. This application breaks through the technical bottleneck of traditional dissimilar metal bonding and can be used to bond traditional difficult-to-bond systems such as aluminum / copper, aluminum / titanium, and aluminum / stainless steel. Material properties can be flexibly controlled. Through the design of the number of layers and the combination of substrates, it can simultaneously meet the complex functional requirements of high strength, lightweight, high electrical and thermal conductivity, and corrosion resistance, showing unique advantages in the fields of new energy vehicle battery components, aerospace structural parts, electronic heat dissipation substrates, etc. It has broad application prospects in high-end equipment, new energy, electronic information and other industries. Its green manufacturing characteristics and efficient resource utilization model provide key technical support for achieving sustainable development goals. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions of various embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1: An aluminum-based multilayer composite sheet with a three-layer structure of titanium, aluminum, and stainless steel. An aluminum ingot is placed in a smelting furnace for smelting and heated to 720°C to 750°C to obtain molten aluminum. The molten aluminum is then poured into a holding furnace, controlled at a temperature of 660°C to 750°C, and held at this temperature for 20 to 60 minutes. After this holding period, the aluminum is degassed and filtered using an online processing device.

[0026] The titanium plate is uncoiled on a decoiler and then conveyed to a twin-roll casting unit. Under tension, it is pressed against the lower rolls before entering the casting zone. Before uncoiling, the titanium plate undergoes physical or chemical cleaning to remove the surface metal oxide layer. Before entering the casting zone, the titanium plate is heated to a temperature between 50°C and 250°C. Molten aluminum at a temperature between 660°C and 750°C is statically injected through a nozzle into the die-casting gap, with an injection width equal to the width of the titanium plate. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s. The upper and lower rolls cool the molten aluminum and titanium plate, and then solid-liquid casting and rolling is performed to form an aluminum-based composite slab coil.

[0027] The aluminum-based composite slab is unwound on a decoiler, followed by the stainless steel sheet. The slab is then conveyed to a twin-roll casting unit, where it is tensioned against the lower roll and then enters the casting zone. The aluminum side of the aluminum-based composite slab coil contacts the molten aluminum. Liquid aluminum at a temperature between 660°C and 750°C is statically pressured and injected through a nozzle into the die-casting gap, with the injection width being the width of the sheet. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s.

[0028] The aluminum-based composite sheet blank is placed in an annealing furnace for homogenization annealing at a heating temperature of 200°C to 600°C for 2 hours to 30 hours to obtain a titanium-aluminum-stainless steel multilayer composite sheet.

[0029] Example 2: An aluminum-based multilayer composite sheet with a four-layer structure of aluminum, titanium, aluminum, and stainless steel. Aluminum ingots are placed in a smelting furnace for smelting and heated to 720°C to 750°C to produce molten aluminum. The molten aluminum is then poured into a holding furnace, controlled at 660°C to 750°C, and held at this temperature for 20 to 60 minutes. After this holding period, the molten aluminum is degassed and filtered via online processing equipment. A titanium plate is uncoiled on an uncoiler and then conveyed to a twin-roll casting unit, where it is tensioned against the lower rolls and enters the casting zone. Before uncoiling, the titanium plate undergoes physical or chemical cleaning to remove the surface metal oxide layer. Before entering the casting zone, the titanium plate is heated to a temperature between 50°C and 250°C. Molten aluminum, at a temperature between 660°C and 750°C, is statically pressured and injected into the die-casting gap through a casting nozzle, with the injection width corresponding to the width of the titanium plate. The casting zone is filled with an inert gas protective atmosphere. The cooling rate in the casting and rolling zone is 300℃ / s to 1000℃ / s. The upper and lower rollers cool the molten aluminum and titanium plates and perform solid-liquid casting to form aluminum-based composite slab coils.

[0030] The aluminum-based composite slab is unwound on a decoiler, followed by the stainless steel sheet. The slab is then conveyed to a twin-roll casting unit, where it is tensioned against the lower roll and then enters the casting zone. The titanium side of the aluminum-based composite slab coil contacts the molten aluminum. Molten aluminum at a temperature between 660°C and 750°C is statically pressured and injected through a nozzle into the die-casting gap, with the injection width being the width of the sheet. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s.

[0031] The aluminum-based composite sheet coil is placed in an annealing furnace for homogenization annealing at a heating temperature of 200°C to 600°C for 2 hours to 30 hours to obtain an aluminum-titanium-aluminum-stainless steel multilayer composite sheet.

[0032] Example 3: An aluminum-based multilayer composite sheet material having a five-layer structure of titanium-aluminum-stainless steel-aluminum-titanium. The process comprises the following steps: Aluminum ingots are placed in a smelting furnace for smelting, heated to 720°C–750°C to produce molten aluminum; the molten aluminum is then poured into a holding furnace, controlled at a temperature between 660°C and 750°C, and held at this temperature for 20–60 minutes; the molten aluminum is then degassed and filtered via an online treatment device. Stainless steel and titanium sheets are uncoiled on an uncoiler and conveyed to a twin-roll casting unit, where they are tensioned against the lower rolls and enter the casting zone. Before uncoiling, the stainless steel and titanium sheets undergo physical or chemical cleaning to remove the surface metal oxide layer. The stainless steel and titanium sheets are heated before entering the casting zone, at a temperature between 50°C and 250°C. Molten aluminum at a temperature between 660°C and 750°C is statically injected through a nozzle into the die-casting gap (between the stainless steel and titanium plates) under pressure, with the injection width corresponding to the width of the plates. The casting and rolling zone is filled with an inert gas protective atmosphere. The cooling rate in this zone is between 300°C / s and 1000°C / s. Upper and lower rollers cool the molten aluminum and titanium plates and perform solid-liquid casting to form an aluminum-based composite slab coil.

[0033] The aluminum-based composite slab is unwound on a decoiler, followed by the stainless steel sheet. The slab is then conveyed to a twin-roll casting unit, where it is tensioned against the lower rolls and then enters the casting zone. The stainless steel side of the aluminum-based composite slab coil contacts the molten aluminum. Liquid aluminum at a temperature between 660°C and 750°C is statically pressured and injected through a nozzle into the die-casting gap, with the injection width equal to the sheet width. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s.

[0034] The aluminum-based composite sheet blank is placed in an annealing furnace for homogenization annealing at a heating temperature of 200°C to 600°C for 2 hours to 30 hours to obtain a titanium-aluminum-stainless steel-aluminum-titanium multilayer composite sheet.

[0035] Example 4: An aluminum-based multilayer composite sheet material having a five-layer structure of titanium-aluminum-stainless steel-aluminum-titanium. Aluminum ingots are added to a smelting furnace for smelting and heated to 720°C to 750°C to produce molten aluminum. The molten aluminum is then poured into a holding furnace, controlled at a temperature of 660°C to 750°C, and held at this temperature for 20 to 60 minutes. After this holding period, the molten aluminum is degassed and filtered using online processing equipment. Stainless steel and titanium sheets are uncoiled on an uncoiler and conveyed to a twin-roll casting unit. Under tension, they are pressed against the lower rolls and enter the casting zone. Before uncoiling, the stainless steel and titanium sheets undergo physical or chemical cleaning to remove the surface metal oxide layer. The stainless steel and titanium sheets are heated before entering the casting zone at a temperature between 50°C and 250°C. Molten aluminum at a temperature between 660°C and 750°C is statically injected through a nozzle into the die-casting gap (between the stainless steel and titanium plates) under pressure, with the injection width corresponding to the width of the plates. The casting and rolling zone is filled with an inert gas atmosphere. The cooling rate in this zone is between 300°C / s and 1000°C / s. Upper and lower rollers cool the molten aluminum and titanium plates and perform solid-liquid casting to form an aluminum-based composite slab coil. This coil is then cold-rolled to reduce its thickness. After cold rolling, it is placed in an annealing furnace for homogenization annealing at a temperature between 200°C and 600°C for 2 to 30 hours.

[0036] The aluminum-based composite slab is unwound on a decoiler, followed by the stainless steel sheet. The slab is then conveyed to a twin-roll casting unit, where it is tensioned against the lower rolls and then enters the casting zone. The stainless steel side of the aluminum-based composite slab coil contacts the molten aluminum. Liquid aluminum at a temperature between 660°C and 750°C is statically pressured and injected through a nozzle into the die-casting gap, with the injection width equal to the sheet width. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s.

[0037] The aluminum-based composite sheet blank is placed in an annealing furnace for homogenization annealing at a heating temperature of 200°C to 600°C for 2 hours to 30 hours to obtain a titanium-aluminum-stainless steel-aluminum-titanium multilayer composite sheet.

[0038] Example 5: An aluminum-based multilayer composite sheet with a six-layer structure of aluminum-titanium-aluminum-stainless steel-aluminum-titanium. An aluminum ingot is placed in a smelting furnace for smelting and heated to 720°C to 750°C to produce molten aluminum. The molten aluminum is then poured into a holding furnace, controlled at 660°C to 750°C, and held at this temperature for 20 to 60 minutes. After this holding period, the molten aluminum is degassed and filtered via online processing equipment. A titanium sheet is uncoiled on an uncoiler and then conveyed to a twin-roll casting unit, where it is tensioned against the lower rolls and enters the casting zone. Before uncoiling, the titanium sheet undergoes physical or chemical cleaning to remove the surface metal oxide layer. Before entering the casting zone, the titanium sheet is heated to a temperature between 50°C and 250°C. Molten aluminum, at a temperature between 660°C and 750°C, is injected into the die-casting gap through a casting nozzle under static pressure, with the injection width equal to the sheet width. The casting zone is filled with an inert gas protective atmosphere. The cooling rate in the casting and rolling zone is 300°C / s to 1000°C / s. Step E: The upper and lower rollers cool the molten aluminum and titanium plate and perform solid-liquid casting to form an aluminum-based composite plate billet coil.

[0039] The aluminum-based composite slab is coiled and unwound on a decoiler, followed by the stainless steel sheet. Before uncoiling, the stainless steel sheet undergoes physical or chemical cleaning to remove the surface metal oxide layer. The stainless steel sheet is heated between 50°C and 250°C before entering the casting zone. The sheets are then conveyed together to a twin-roll casting unit, where they are tensioned against the lower rolls before entering the casting zone. The titanium side of the aluminum-based composite slab coil contacts the molten aluminum. Molten aluminum at a temperature between 660°C and 750°C is statically pressured and injected into the die-casting gap through a nozzle, with the injection width equal to the sheet width. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s.

[0040] The aluminum-based composite slab is coiled and unwound on a decoiler, followed by the titanium sheet. Before uncoiling, the titanium sheet undergoes physical or chemical cleaning to remove the surface metal oxide layer. The titanium sheet is heated between 50°C and 250°C before entering the casting zone. The sheets are then conveyed together to a twin-roll casting unit, where they are tensioned against the lower rolls and enter the casting zone. The stainless steel side of the aluminum-based composite slab coil contacts the molten aluminum. Molten aluminum at a temperature between 660°C and 750°C is statically pressured and injected into the die-casting gap through a nozzle, with the injection width equal to the sheet width. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s.

[0041] Step H: Place the aluminum-based composite sheet coil in an annealing furnace for homogenization annealing at a temperature of 200°C to 600°C for 2 hours to 30 hours to obtain an aluminum-titanium-aluminum-stainless steel-aluminum-titanium multilayer composite sheet.

[0042] Example 6: An aluminum-based multilayer composite sheet material having a seven-layer structure of copper-aluminum-titanium-aluminum-stainless steel-aluminum-copper. Aluminum ingots are placed in a smelting furnace for smelting and heated to 720°C to 750°C to produce molten aluminum. The molten aluminum is then poured into a holding furnace, controlled at a temperature of 660°C to 750°C, and held at this temperature for 20 to 60 minutes. After this holding period, the molten aluminum is degassed and filtered using online processing equipment. Titanium and copper plates are uncoiled on an uncoiler and then conveyed to a twin-roll casting unit. Under tension, they are pressed against the lower rolls and enter the casting zone. Before uncoiling, the titanium and copper plates undergo physical or chemical cleaning to remove the surface metal oxide layer. The titanium and copper plates are heated before entering the casting zone at a temperature between 50°C and 250°C. Molten aluminum at a temperature between 660°C and 750°C is statically injected through a casting nozzle into the die-casting gap (between the titanium and copper plates) under pressure, with the injection width corresponding to the plate width. The casting and rolling zone is filled with an inert gas atmosphere. The cooling rate in this zone is between 300°C / s and 1000°C / s. Step E: Upper and lower rollers cool the molten aluminum and titanium plates and perform solid-liquid casting to form aluminum-based composite slab coil A.

[0043] The stainless steel and copper sheets are uncoiled on a decoiler and then conveyed to a twin-roll casting unit. Under tension, they are pressed against the lower rolls and enter the casting zone. Before uncoiling, the stainless steel and copper sheets undergo physical or chemical cleaning to remove the surface metal oxide layer. Before entering the casting zone, the stainless steel and copper sheets are heated to a temperature between 50°C and 250°C. Molten aluminum at a temperature between 660°C and 750°C is statically injected through a nozzle into the die-casting gap (between the stainless steel and copper sheets) with a width equal to the sheet width. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s. Step E: The upper and lower rolls cool the molten aluminum and titanium sheet and perform solid-liquid casting to form the aluminum-based composite sheet coil B.

[0044] Aluminum-based composite slab coils A and B are uncoiled on an uncoiler and heated to a temperature between 50°C and 250°C before entering the casting zone. They are then conveyed to a twin-roll casting unit and, under tension, pressed against the lower rolls before entering the casting zone. Molten aluminum at a temperature between 660°C and 750°C is statically pressured and injected through a nozzle into the die-casting gap, with the injection width corresponding to the sheet width. The casting zone is then filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s. This results in aluminum-based composite slab coil C.

[0045] Step H: The aluminum-based composite sheet coil C is placed in an annealing furnace for homogenization annealing at a temperature of 200°C to 600°C for 2 to 30 hours. After annealing, a copper-aluminum-titanium-aluminum-stainless steel-aluminum-copper multilayer composite sheet is obtained.

[0046] Example 7: An aluminum-based multilayer composite sheet material having a seven-layer structure of copper-aluminum-titanium-aluminum-stainless steel-aluminum-copper. Aluminum ingots are added to a smelting furnace for smelting and heated to 720°C to 750°C to produce molten aluminum. The molten aluminum is then poured into a holding furnace, controlled at a temperature of 660°C to 750°C, and held at this temperature for 20 to 60 minutes. After this holding period, the molten aluminum is degassed and filtered using online processing equipment. Titanium and copper plates are uncoiled on an uncoiler and then conveyed to a twin-roll casting unit. Under tension, they are pressed against the lower rolls and enter the casting zone. Before uncoiling, the titanium and copper plates undergo physical or chemical cleaning to remove the surface metal oxide layer. The titanium and copper plates are heated before entering the casting zone at a temperature between 50°C and 250°C. Molten aluminum at a temperature between 660°C and 750°C is statically injected through a casting nozzle into the die-casting gap (between the titanium and copper plates) under pressure, with the injection width corresponding to the plate width. The casting and rolling zone is filled with an inert gas atmosphere. The cooling rate in this zone is between 300°C / s and 1000°C / s. Step E: Upper and lower rollers cool the molten aluminum and titanium plates and perform solid-liquid casting to form aluminum-based composite slab coil A.

[0047] The aluminum-based composite slab coil A is cold rolled to reduce the thickness of the aluminum-based composite slab coil A. After cold rolling, the aluminum-based composite slab coil A is placed in an annealing furnace for homogenization annealing at a heating temperature of 200° C. to 600° C. for 2 hours to 30 hours.

[0048] The stainless steel and copper sheets are uncoiled on a decoiler and then conveyed to a twin-roll casting unit. Under tension, they are pressed against the lower rolls and enter the casting zone. Before uncoiling, the stainless steel and copper sheets undergo physical or chemical cleaning to remove the surface metal oxide layer. Before entering the casting zone, the stainless steel and copper sheets are heated to a temperature between 50°C and 250°C. Molten aluminum at a temperature between 660°C and 750°C is statically injected through a nozzle into the die-casting gap (between the stainless steel and copper sheets) with a width equal to the sheet width. The casting zone is filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s. Step E: The upper and lower rolls cool the molten aluminum and titanium sheet and perform solid-liquid casting to form the aluminum-based composite sheet coil B.

[0049] The aluminum-based composite slab coil B is cold rolled to reduce the thickness of the aluminum-based composite slab coil B. After cold rolling, the aluminum-based composite slab coil B is placed in an annealing furnace for homogenization annealing at a heating temperature of 200° C. to 600° C. for an annealing time of 2 hours to 30 hours.

[0050] Aluminum-based composite slab coils A and B are uncoiled on an uncoiler and heated to a temperature between 50°C and 250°C before entering the casting zone. They are then conveyed to a twin-roll casting unit and, under tension, pressed against the lower rolls before entering the casting zone. Molten aluminum at a temperature between 660°C and 750°C is statically pressured and injected through a nozzle into the die-casting gap, with the injection width corresponding to the sheet width. The casting zone is then filled with an inert gas atmosphere. The cooling rate in the casting zone is between 300°C / s and 1000°C / s. This results in aluminum-based composite slab coil C.

[0051] Step H: The aluminum-based composite sheet coil C is placed in an annealing furnace for homogenization annealing at a temperature of 200°C to 600°C for 2 to 30 hours. After annealing, a copper-aluminum-titanium-aluminum-stainless steel-aluminum-copper multilayer composite sheet is obtained.

[0052] By reducing the sheet thickness through rolling, aluminum-based composite sheets with 8, 9, or even more layers can be obtained. Theoretically, there is no limit to the number of composite layers. Composite materials can be metals or metal alloys with a melting point higher than aluminum and a contact angle θ less than 90°. These include copper, titanium, nickel, iron, molybdenum, zinc, and copper alloys, as well as stainless steel, titanium, magnesium, molybdenum, zinc, and nickel alloys. Examples are not provided here.

Claims

1. An aluminum-based multi-layer composite plate, characterized by: Molten aluminum liquid and metal single-element plate or metal alloy plate are solid-liquid cast-rolled on one side or both sides to form aluminum-based composite plate; Then, using molten aluminum liquid as an intermediate, the aluminum-based composite plate is composited with a metal single-element plate or a metal alloy plate or an aluminum-based composite plate by double-sided solid-liquid casting and rolling, and the process is repeated once or multiple times to obtain an aluminum-based multi-layer composite plate.

2. The aluminum-based multi-layer composite plate according to claim 1, characterized in that: The metal single-element plate or the metal alloy plate has a melting point higher than that of aluminum and a contact angle θ less than 90°.

3. The aluminum-based multi-layer composite plate according to claim 1, characterized in that: Cooling is performed during solid-liquid casting and the cooling rate is between 300°C / s and 1000°C / s.

4. The aluminum-based multi-layer composite plate according to claim 1, characterized in that: When the molten aluminum liquid is the intermediate, the molten aluminum liquid contacts the non-aluminum base surface of the aluminum-based composite plate during solid-liquid casting.

5. The aluminum-based multi-layer composite plate according to claim 3, characterized in that: During solid-liquid casting and rolling, eutectic reaction occurs between aluminum and other metals.

6. A method for manufacturing an aluminum-based multi-layer composite plate, characterized by: The method for producing the aluminum-based multi-layer composite plate according to claim 5 comprises the following steps: Step A: Add the aluminum ingot into the smelting furnace for smelting treatment, heat it to 720℃~750℃ to obtain molten aluminum liquid, pour the molten aluminum liquid into the holding furnace, control the temperature at 660℃~750℃, and keep it at this temperature for 20min~60min; Step B: After being kept warm and allowed to stand, the molten aluminum is degassed and filtered through online processing equipment; Step C: The metal sheet or metal alloy sheet is uncoiled on an uncoiler and then transported to a twin-roll casting device, and enters the casting zone close to the lower roll under the action of tension; Step D: injecting aluminum liquid at a temperature range of 660°C to 750°C into the die-casting gap under static pressure through the casting nozzle, with the injection width being the width of the plate; Step E: upper and lower rollers cool the molten aluminum and the metal sheet or metal alloy sheet and perform solid-liquid casting to form an aluminum-based composite sheet coil; Step F: Uncoiling the aluminum-based composite slab on an uncoiler, then uncoiling the metal sheet or metal alloy sheet or aluminum-based composite slab on an uncoiler, and then conveying them together to a twin-roll casting device, and under the action of tension, they all cling to the lower roll and enter the casting zone; Step G: injecting aluminum liquid at a temperature range of 660°C to 750°C into the die-casting gap under static pressure through a casting nozzle, with the injection width being the width of the plate; Step H: Repeat steps F and G until an aluminum-based multi-layer composite sheet roll with a desired number of layers is obtained; Step I: placing the aluminum-based multi-layer composite plate coil into an annealing furnace for homogenization annealing at a heating temperature of 200° C. to 600° C. for 2 h to 30 h, to obtain an aluminum-based multi-layer composite plate after annealing.

7. The method for manufacturing an aluminum-based multi-layer composite plate according to claim 6, wherein: After step E and step G, the aluminum-based composite slab coil is cold rolled to reduce the thickness of the aluminum-based composite slab coil.

8. The method for manufacturing an aluminum-based multi-layer composite sheet according to claim 7, wherein after cold rolling, the aluminum-based composite sheet coil is placed in an annealing furnace for homogenization annealing, the heating temperature is 200°C to 600°C, and the annealing time is 2h to 30h.

9. The method for manufacturing an aluminum-based multi-layer composite plate according to claim 6, wherein: The metal sheet or metal alloy sheet is physically cleaned or chemically cleaned to remove the surface metal oxide layer before uncoiling.

10. A method for manufacturing an aluminum-based multi-layer composite sheet according to claim 6, characterized in that the metal single-element sheet or metal alloy sheet or aluminum-based composite sheet billet is heated before entering the casting and rolling zone, and the heating temperature is between 50°C and 250°C.

11. The method for manufacturing an aluminum-based multi-layer composite plate according to claim 6, wherein: The casting and rolling area is filled with an inert gas protective atmosphere.

12. The method for manufacturing an aluminum-based multi-layer composite plate according to claim 6, wherein: The cooling rate in the casting and rolling zone is 300℃ / s~1000℃ / s.

13. The method for manufacturing an aluminum-based multi-layer composite plate according to claim 6, wherein After step E and step G, the aluminum-based composite slab coil is placed in an annealing furnace for homogenization annealing at a heating temperature of 200° C. to 600° C. for an annealing time of 2 h to 30 h.