A layered titanium / aluminum composite plate and a method for manufacturing the same

Abstract

This invention discloses a layered titanium / aluminum composite plate and its preparation method, belonging to the field of metal composite material manufacturing technology. During the rolling process, SiCp powder is sprayed into the titanium / aluminum composite plate, wherein SiCp particles with a size of 20 μm or less account for more than 95% of the powder. This invention uses pure titanium as the cladding layer and aluminum alloy as the substrate to prepare a Ti / Al layered composite plate, combining the characteristics of these two metals. It possesses both the lightweight and low cost of aluminum and the high strength and rigidity of titanium. Through reasonable process design, the SiCp powder is rolled together, significantly enhancing the bonding strength of the composite plate. The titanium / aluminum composite plate exhibits an interfacial shear strength ≥130 MPa, a tensile strength ≥280 MPa, and a bending resistance ≥10 times. Furthermore, it avoids the environmental pollution problems associated with electroplating and physicochemical coating methods. This is a titanium / aluminum metal layered composite material preparation and processing technology with excellent development potential, reducing production costs and saving social resources.

Description

Technical Field

[0001] This invention relates to the field of metal composite material manufacturing technology, specifically to a layered titanium / aluminum composite plate and its preparation method. Background Technology

[0002] In the context of the rapid development of emerging industries, traditional single-metal materials are no longer sufficient to meet the needs of national production and daily life. Modern metal structural materials require a combination of lightweight, corrosion resistance, high strength, and high toughness. Currently, composite materials made from dissimilar metals are a common method to improve the strength and toughness of metallic materials, with layered composite methods being extremely widely used. By employing certain physical and chemical methods to achieve metallurgical bonding between two or more metals or alloys, layered metal composite materials can be prepared. The types of component metals can be freely selected and rationally combined according to production needs. Layered metal composite materials not only possess the properties of each component metal but also gain some unexpected superior properties due to the interfacial metallurgical bonding, such as excellent formability, electrical conductivity, and corrosion resistance, resulting in good economic benefits.

[0003] Aluminum is one of the most commonly used metals in the Earth's crust. Its lightweight, excellent thermal conductivity, and corrosion resistance make it suitable for various commercial applications. However, aluminum and its alloys have relatively low strength and stiffness, making it difficult to meet the requirements of applications demanding both high strength and stiffness. Titanium and its alloys, due to their high specific strength, high-temperature resistance, and fracture toughness, have become the preferred materials for industrial applications. However, the high cost of titanium alloys deters many producers.

[0004] Therefore, the technical problem that this invention urgently needs to solve is to prepare a metal composite sheet that combines high strength and rigidity with low cost. Summary of the Invention

[0005] The present invention provides a layered titanium / aluminum composite plate and its preparation method, which achieves a better bonding interface microstructure than the traditional titanium / aluminum composite production process, has high interface strength, and can mass-produce titanium / aluminum composite metal plates with good plate shape and high thickness accuracy, thereby reducing production costs and shortening the delivery cycle.

[0006] To achieve the above-mentioned technical objectives, the present invention mainly adopts the following technical solutions:

[0007] In a first aspect, the present invention discloses a method for preparing a layered titanium / aluminum composite plate, wherein SiCp powder is sprayed into the titanium / aluminum composite plate during the rolling process.

[0008] Furthermore, in the SiCp powder, SiCp particles with a size of 20 μm or less account for more than 95% of the powder.

[0009] Furthermore, the titanium / aluminum composite plate is rolled in multiple passes during the rolling process, with each rolling reduction rate ≤10% and the total rolling reduction being 30%-40%.

[0010] Specifically, the method for preparing the layered titanium / aluminum composite plate of the present invention includes the following steps:

[0011] S1: Place the cold-rolled aluminum coil and titanium coil on two uncoilers respectively to uncoil. After uncoiling, clean the surface of the titanium plate with the first cleaning solution and the aluminum plate with the second cleaning solution. Then use clean water to remove the residual solution and products on the surface and squeeze the water dry with a squeeze roller.

[0012] S2: The surfaces of the aluminum and titanium plates to be bonded are mechanically treated using a rotating wire brush method. After the surface roughness meets the requirements, the surface is ground along the rolling direction of the composite plate. Then, it is ultrasonically cleaned in acetone solution and dried with hot air.

[0013] S3: The surface-treated aluminum or titanium plate is pre-stretched or pre-compressed according to its metallic properties, wherein the pre-stretching or pre-compression direction is along the rolling direction and perpendicular to the rolling direction.

[0014] S4: During the rolling process, SiCp powder is sprayed between the titanium plate and the aluminum plate;

[0015] S5: After rolling, the product is annealed at 350-400℃. The annealed product is then leveled, finished, and inspected in the leveling unit.

[0016] In a preferred embodiment of the present invention, in step S1, the first cleaning solution includes sulfuric acid, hydrofluoric acid and an organic complex, wherein the sulfuric acid content is 18-22%, the hydrofluoric acid content is 0.8-1.2%, and the organic complex addition amount is 4-6 g / L; the second cleaning solution is a 10-12% NaOH solution.

[0017] Furthermore, in step S1, the first cleaning solution is used to clean for 30-60 seconds at a temperature of 50-70°C; the second cleaning solution is used to clean for 30-60 seconds at a temperature of 70-90°C.

[0018] In a preferred embodiment of the present invention, in step S2, the surfaces of the aluminum plate and the steel plate to be joined are mechanically treated by a rotating wire brush for 10-13 seconds to make their surface roughness 20-30 μm.

[0019] In a preferred embodiment of the present invention, in step S3, the pre-stretch deformation is 2-4%, the strain rate is 0.2-0.4 mm / min, the heating temperature of the titanium plate is 520-600℃, and the heating temperature of the aluminum plate is 530-610℃.

[0020] Secondly, the present invention also discloses a layered titanium / aluminum composite plate prepared by the layered titanium / aluminum composite plate preparation method described in the first aspect.

[0021] Specifically, the titanium / aluminum composite plate has an interfacial shear strength ≥130MPa, a tensile strength ≥280MPa, and a bending cycle ≥10 times.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention uses pure titanium as the cladding layer and aluminum alloy as the substrate to prepare Ti / Al layered composite plates. These lightweight Ti / Al layered composite plates (LMCs) combine the characteristics of these two metals, possessing both the lightweight and low cost of aluminum and the high strength and rigidity of titanium.

[0024] Through reasonable process design, the present invention combines SiCp powder by rolling, which significantly enhances the bonding strength of the composite plate. The titanium / aluminum composite plate has an interfacial shear strength ≥130MPa, a tensile strength ≥280MPa, and can withstand repeated bending ≥10 times.

[0025] The rolling technology provided by this invention is easy to implement for large-scale industrial production, and does not have the environmental pollution problems caused by electroplating and physicochemical coating methods. It is a titanium / aluminum metal layered composite material preparation and processing technology with very good development potential, which reduces production costs and saves social resources. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Reagents not specifically described in detail in this invention are all conventional reagents and are commercially available; methods not specifically described in detail are all conventional experimental methods and can be obtained from the prior art.

[0027] It should be noted that the terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor do they substantially limit the technical features that follow. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] This invention provides a method for preparing layered titanium / aluminum composite plates, in which SiCp powder is sprayed in during the layered rolling process of titanium / aluminum. Specifically, the method includes: uncoiling aluminum and titanium coils → solution cleaning → drying and roughening → prestressing treatment → induction furnace heating → rolling with SiCp powder spraying → heat treatment → leveling → finishing → inspection → marking → judgment → warehousing. Chemical composition of 6061 aluminum coil: Cu: 0.15-0.4wt%, Mn: 0.14-0.16wt%, Mg: 0.8-1.2wt%, Zn: 0.23-0.27wt%, Cr: 0.04-0.35wt%, Ti: 0.14-0.16wt%, Si: 0.4-0.8wt%, Fe: 0.68-0.72wt%, with the remainder being Al and unavoidable impurities. Chemical composition of TA2 titanium coil: Fe≤0.30wt%, C≤0.10wt%, N≤0.05wt%, H≤0.015wt%, O≤0.25wt%, with the remainder being Ti and unavoidable impurities. The production process is as follows: Cold-rolled 6061 aluminum coils and TA2 titanium coils are placed on two uncoilers for uncoiling. After uncoiling, the surface of the titanium plate is cleaned at 50-70℃ for 30-60 seconds with a sulfuric acid content of 18-22%, a hydrofluoric acid content of 0.8-1.2%, and an organic complex addition of 4-6 g / L. The aluminum plate is cleaned at 70-90℃ for 30-60 seconds with a 10-12% NaOH solution. Residual solution and products on the surface are removed by spraying clean water, and the water is squeezed dry with a squeeze roller. The surfaces of the aluminum and steel plates to be joined are mechanically treated for 10-13 seconds using a rotating wire brush method, achieving a surface roughness of 20-30 μm, with the grinding direction along the rolling direction of the composite plate. Subsequently, they are ultrasonically cleaned in an acetone solution for 3- After 5 minutes, the surface-treated aluminum and titanium plates are dried by hot air. The plates are then pre-stretched or pre-compressed according to their metallic properties, with the stretching and compression directions along and perpendicular to the rolling direction. The pre-stretch deformation is 2-4%, and the strain rate is 0.2-0.4 mm / min. The titanium plate is heated to 520-600℃, and the aluminum plate to 530-610℃. During rolling, SiCp powder with a particle size ≤20µm (95% or more) is sprayed between the titanium and aluminum plates. Multiple rolling passes are performed, with each pass having a reduction rate ≤10%, and the total reduction is 30%-40%. After rolling, the plates are annealed at 350-400℃. The annealed products are then leveled, finished, and inspected on a leveling unit.

[0029] This invention uses pure titanium as the cladding layer and aluminum alloy as the substrate to prepare Ti / Al layered composite plates. These lightweight Ti / Al layered composite plates (LMCs) combine the properties of both metals, possessing the lightweight and low cost of aluminum and the high strength and rigidity of titanium. Furthermore, according to the Ti-Al binary phase diagram, Al has a higher solid solubility in Ti, while Ti has a lower solid solubility in Al. Under specific conditions, the two can form intermetallic compounds, achieving metallurgical bonding. Therefore, it is feasible to achieve composite bonding between titanium and aluminum plates, and the Ti-TiAl3-Al system is more attractive than single metals, with wide applications in defense, aerospace, and automotive structural components.

[0030] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0031] Example 1

[0032] This invention provides a method for preparing layered titanium / aluminum composite plates:

[0033] The chemical composition of 6061 aluminum coil is as follows: Cu 0.25wt%, Mn 0.14wt%, Mg 0.9wt%, Zn 0.25wt%, Cr 0.10wt%, Ti 0.15wt%, Si 0.6wt%, Fe 0.70wt%, with the remainder being Al and unavoidable impurities; the chemical composition of TA2 titanium coil is as follows: Fe 0.10wt%, C 0.05wt%, N 0.01wt%, H 0.002wt%, O 0.02wt%, with the remainder being Ti and unavoidable impurities.

[0034] The production process is as follows: Cold-rolled 6061 aluminum coils and TA2 titanium coils are placed on two uncoilers for uncoiling. After uncoiling, the surface of the titanium plate is cleaned at 60°C for 45 seconds with a sulfuric acid content of 20%, a hydrofluoric acid content of 1%, and an organic complex addition of 5 g / L. The aluminum plate is cleaned at 80°C for 45 seconds with an 11% NaOH solution. Residual solution and products on the surface are removed by spraying clean water, and the water is squeezed dry with a squeeze roller. The surfaces of the aluminum and steel plates to be joined are mechanically treated for 12 seconds using a rotating wire brush method, achieving a surface roughness of 25 μm, with the grinding direction along the rolling direction of the composite plate. Subsequently, they are ultrasonically cleaned in an acetone solution for 4 minutes. After rolling, the aluminum and titanium plates are dried by hot air. The surface-treated aluminum and titanium plates are pre-stretched or pre-compressed according to their metallic properties, with the stretching and compression directions along and perpendicular to the rolling direction. The pre-stretch deformation is 3%, and the strain rate is 0.3 mm / min. The titanium plate is heated to 560℃, and the aluminum plate to 570℃. During rolling, SiCp powder with a particle size ≤20µm (≥95%) is sprayed between the titanium and aluminum plates. Multiple rolling passes are performed, with each pass having a reduction rate ≤10%, and a total reduction of 32%. After rolling, the plates are annealed at 400℃. The finished products are leveled, finished, and inspected on a leveling unit.

[0035] The interfacial shear strength of the titanium / aluminum composite plate was tested to be 135 MPa, the tensile strength to be 290 MPa, and the number of repeated bending cycles was 12. Its performance meets the technical requirements of the customer.

[0036] Example 2

[0037] This invention provides a method for preparing layered titanium / aluminum composite plates:

[0038] The chemical composition of 6061 aluminum coil is as follows: Cu 0.40wt%, Mn 0.13wt%, Mg 0.8wt%, Zn 0.20wt%, Cr 0.10wt%, Ti 0.15wt%, Si 0.7wt%, Fe 0.60wt%, with the remainder being Al and unavoidable impurities; the chemical composition of TA2 titanium coil is as follows: Fe 0.15wt%, C 0.03wt%, N 0.02wt%, H 0.002wt%, O 0.01wt%, with the remainder being Ti and unavoidable impurities.

[0039] The production process is as follows: Cold-rolled 6061 aluminum coils and TA2 titanium coils are placed on two uncoilers for uncoiling. After uncoiling, the surface of the titanium plate is cleaned at 70°C for 30 seconds with a sulfuric acid content of 22%, a hydrofluoric acid content of 0.8%, and an organic complex addition of 4 g / L. The aluminum plate is cleaned at 90°C for 30 seconds with a 12% NaOH solution. Residual solution and products on the surface are removed by spraying clean water, and the water is squeezed dry with a squeeze roller. The surfaces of the aluminum and steel plates to be joined are mechanically treated for 13 seconds using a rotating wire brush method, achieving a surface roughness of 30 μm, with the grinding direction along the rolling direction of the composite plate. Subsequently, they are ultrasonically cleaned in an acetone solution for 5 minutes. Afterward, the surface-treated aluminum and titanium plates are dried by hot air. The plates are then pre-stretched or pre-compressed according to their metallic properties, with the stretching and compression directions along and perpendicular to the rolling direction. The pre-stretch deformation is 4%, and the strain rate is 0.2 mm / min. The titanium plate is heated to 530℃, and the aluminum plate to 550℃. During rolling, SiCp powder with a particle size ≤20µm (95% or more) is sprayed between the titanium and aluminum plates. Multiple rolling passes are performed, with each pass having a reduction rate ≤10%, and a total reduction of 38%. After rolling, the plates are annealed at 350℃. The finished products are then leveled, finished, and inspected on a leveling unit.

[0040] The interfacial shear strength of the titanium / aluminum composite plate was tested to be 140 MPa, the tensile strength to be 315 MPa, and the number of repeated bending cycles to be 11. Its performance meets the technical requirements of the customer.

[0041] Example 3

[0042] This invention provides a method for preparing layered titanium / aluminum composite plates:

[0043] The chemical composition of 6061 aluminum coil is as follows: Cu 0.20wt%, Mn 0.16wt%, Mg 0.9wt%, Zn 0.30wt%, Cr 0.12wt%, Ti 0.16wt%, Si 0.7wt%, Fe 0.70wt%, with the remainder being Al and unavoidable impurities; the chemical composition of TA2 titanium coil is as follows: Fe 0.20wt%, C 0.06wt%, N 0.015wt%, H 0.002wt%, O 0.02wt%, with the remainder being Ti and unavoidable impurities.

[0044] The production process is as follows: Cold-rolled 6061 aluminum coils and TA2 titanium coils are placed on two uncoilers for uncoiling. After uncoiling, the surface of the titanium plate is cleaned at 50°C for 60 seconds with a sulfuric acid content of 18%, a hydrofluoric acid content of 1.2%, and an organic complex addition of 6 g / L. The aluminum plate is cleaned at 70°C for 60 seconds with a 10% NaOH solution. Residual solution and products on the surface are removed by spraying clean water, and the water is squeezed dry with a squeeze roller. The surfaces of the aluminum and steel plates to be joined are mechanically treated for 12 seconds using a rotating wire brush method, with a surface roughness of 25 μm. The grinding direction is along the rolling direction of the composite plate. Subsequently, they are ultrasonically cleaned in acetone solution for 4 minutes. Afterward, the surface-treated aluminum and titanium plates are dried by hot air. The plates are then pre-stretched or pre-compressed according to their metallic properties, with the stretching and compression directions along and perpendicular to the rolling direction. The pre-stretch deformation is 2%, and the strain rate is 0.2 mm / min. The titanium plate is heated to 600℃, and the aluminum plate to 610℃. During rolling, SiCp powder with a particle size ≤20µm (95% or more) is sprayed between the titanium and aluminum plates. Multiple rolling passes are performed, with each pass having a reduction rate ≤10%, and a total reduction of 30%. After rolling, the plates are annealed at 380℃. The finished products are then leveled, finished, and inspected on a leveling unit.

[0045] The interfacial shear strength of the titanium / aluminum composite plate was tested to be 140 MPa, the tensile strength to be 305 MPa, and the number of repeated bending cycles to be 13. Its performance meets the technical requirements of the customer.

[0046] Example 4

[0047] This invention provides a method for preparing layered titanium / aluminum composite plates:

[0048] The chemical composition of 6061 aluminum coil is as follows: Cu 0.28wt%, Mn 0.15wt%, Mg 0.9wt%, Zn 0.30wt%, Cr 0.10wt%, Ti 0.15wt%, Si 0.7wt%, Fe 0.70wt%, with the remainder being Al and unavoidable impurities; the chemical composition of TA2 titanium coil is as follows: Fe 0.15wt%, C 0.04wt%, N 0.01wt%, H 0.001wt%, O 0.02wt%, with the remainder being Ti and unavoidable impurities.

[0049] The production process is as follows: Cold-rolled 6061 aluminum coils and TA2 titanium coils are placed on two uncoilers for uncoiling. After uncoiling, the surface of the titanium plate is cleaned at 70°C for 40 seconds with a solution containing 20% ​​sulfuric acid, 1% hydrofluoric acid, and 5g / L of organic complex. The aluminum plate is cleaned at 90°C for 40 seconds with an 11% NaOH solution. Residual solution and products are removed by spraying with water, and the water is squeezed dry with a squeeze roller. The surfaces of the aluminum and steel plates to be joined are mechanically treated for 13 seconds using a rotating wire brush, achieving a surface roughness of 28µm, with the grinding direction along the rolling direction of the composite plate. Subsequently, they are ultrasonically cleaned in acetone solution for 3 minutes before being discharged. After arrival, the aluminum and titanium plates are dried by hot air blowing. The surface-treated aluminum and titanium plates are pre-stretched or pre-compressed according to their metallic properties, with the stretching and compression directions along and perpendicular to the rolling direction. The pre-stretch deformation is 2%, and the strain rate is 0.3 mm / min. The titanium plate is heated to 580℃, and the aluminum plate to 590℃. During rolling, SiCp powder with a particle size ≤20µm (≥95%) is sprayed between the titanium and aluminum plates. Multiple rolling passes are performed, with each pass having a reduction rate ≤10%, and a total reduction of 35%. After rolling, the plates are annealed at 350-400℃. The finished products are leveled, finished, and inspected on a leveling unit.

[0050] The interfacial shear strength of the titanium / aluminum composite plate was tested to be 145 MPa, the tensile strength to be 295 MPa, and the number of repeated bending cycles was 12. Its performance meets the technical requirements of the customer.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for producing a layered titanium / aluminum composite sheet material, characterized by: It comprises the following steps: S1: the cold-rolled aluminum and titanium rolls are respectively placed on two uncoilers, after uncoiling, the surface of the titanium plate is cleaned with a first cleaning solution, the surface of the aluminum plate is cleaned with a second cleaning solution, then the residual solution and product on the surface are removed with clean water, and the water is squeezed out with a squeezing roller; S2: the surfaces to be combined of the aluminum plate and the titanium plate are mechanically treated with a rotating steel wire brush method, and are polished along the rolling direction of the composite plate; then they are cleaned in an acetone solution with ultrasonic waves, and are dried by blowing hot air; S3: the aluminum plate and the titanium plate after surface treatment are pre-stretched or pre-compressed according to their metal characteristics, and the pre-stretching or pre-compressing direction is along the rolling direction and the vertical rolling direction; S4: during rolling, SiCp powder is sprayed between the titanium plate and the aluminum plate; S5: after rolling, annealing is performed at 350-400℃, and the annealed product is opened, finished and inspected in a flattening unit; In step S1, the first cleaning solution comprises sulfuric acid, hydrofluoric acid and an organic complex, the content of the sulfuric acid is 18-22%, the content of the hydrofluoric acid is 0.8-1.2%, and the addition amount of the organic complex is 4-6g / L; the second cleaning solution is a 10-12% NaOH solution.

2. The method of claim 1, wherein the method further comprises: In the SiCp powder, SiCp with a particle size of 20μm or less accounts for more than 95% of the powder. ​ 3. The method of claim 1, wherein the method further comprises: During rolling of the titanium / aluminum composite plate, multi-pass rolling is performed, the rolling reduction rate is ≤10% each time, and the total rolling reduction is 30%-40%. ​ 4. The method of claim 1, wherein the method further comprises: In step S1, the first cleaning solution is cleaned at a temperature of 50-70℃ for 30-60s; the second cleaning solution is cleaned at a temperature of 70-90℃ for 30-60s. ​ 5. The method of claim 1, wherein the method further comprises: In step S2, the surfaces to be combined of the aluminum plate and the steel plate are mechanically treated with a rotating steel wire brush method for 10-13s, so that the surface roughness is 20-30μm. ​ 6. The method of claim 1, wherein the method further comprises: In step S3, the pre-stretching deformation is 2-4%, the heating temperature of the titanium plate is 520-600℃, and the heating temperature of the aluminum plate is 530-610℃. ​ 7. A layered titanium / aluminum composite plate material prepared by the method of claim 1.

8. The layered titanium / aluminum composite sheet of claim 7, wherein: The interface shear strength of the titanium / aluminum composite plate material is ≥130MPa, the tensile strength is ≥280MPa, and the number of repeated bending is ≥10.