A seamless powder core wire for a multi-scale synergistically reinforced Al-based composite coating layer and a preparation method thereof

Abstract

The present application relates to the technical field of material processing engineering, and particularly relates to a multi-scale synergistically reinforced seamless powder core wire for Al-based composite coating and a preparation method thereof. The powder core is wrapped by an outer skin of aluminum alloy material and is obtained through a rotary swaging process. The powder core comprises the following components in percentage by mass: 2-19.4% of Ti powder, 40-42% of ceramic Al2O3 powder and the balance of Al powder. The present application adds Ti element in the Al / Al2O3 composite coating to improve the wettability of the metal / ceramic interface and form an interface with the ceramic phase, increase the bonding strength of the ceramic particles and the metal matrix, so that the ceramic particles can be deposited into the coating more, and the hardness and wear resistance of the coating are improved. The present application can also generate high-hardness intermetallic compounds from part of Ti element and Al through component and process control, and effectively improve the hardness and wear resistance of the coating.

Description

Technical Field

[0001] This invention relates to the field of materials processing engineering technology, and in particular to a seamless powder core wire for multi-scale synergistic reinforcement of Al-based composite coating and its preparation method. Background Technology

[0002] Surface coatings for marine applications are subject to prolonged seawater corrosion, microbial adhesion, and grease contamination, as well as friction and wear caused by human activity and machinery. Surface treatment technology is one of the effective methods to improve the corrosion and wear resistance of material surfaces. Among these, thermal spraying is an important modification measure that improves the reliability of materials by preparing high-quality coatings on their surfaces.

[0003] Arc spraying boasts advantages such as high efficiency, low cost, and suitability for on-site construction, making it widely used in the preparation of protective coatings for critical marine equipment surfaces. Currently, the main types of wires suitable for arc spraying are powder-core wires and solid wires, with powder-core wires produced through rolling and drawing processes being more prevalent. However, the characteristics of the rolling and drawing process result in a relatively loose powder core in the prepared wire, leading to low wire density and limiting the addition of beneficial reinforcing phases. This, in turn, results in lower content of intermetallic compounds and ceramic particles in the coating. Aluminum-based materials offer good corrosion resistance and are relatively inexpensive, making them ideal materials for marine protective coatings. Furthermore, adding ceramic reinforcing phases can further enhance their overall performance, with Al2O3 ceramic particles being a widely used application. Currently, while Al / Al2O3 composite coatings have a high coefficient of friction, Al-based composite coatings have low hardness, and the bonding between Al and Al2O3 ceramic particles in the coating is poor, leading to easy detachment of Al2O3 ceramic particles, which limits their application in wear-resistant applications. Summary of the Invention

[0004] To address the aforementioned technical challenges, this invention provides a seamless powder core wire for Al-based composite coatings with multi-scale synergistic reinforcement and its preparation method. By designing and adding Ti elements to the Al / Al2O3 composite coating, the aim is to improve the wettability of the metal / ceramic interface and form an interface with the ceramic phase, increasing the bonding force between ceramic particles and the metal matrix. This allows more ceramic particles to be deposited into the coating, thereby improving the coating's hardness and wear resistance. In addition, through composition and process control, some Ti elements can be made to form high-hardness intermetallic compounds with Al, which can also effectively improve the coating's hardness and wear resistance. At the same time, the Ti content under the composition and process of this invention is also critical. Excessive Ti content in the powder core will cause the coating to form excessive intermetallic compounds, leading to coating embrittlement, cracking, and compromised overall coating reliability, while also affecting corrosion resistance.

[0005] Specifically, the present invention provides the following technical solution:

[0006] The first aspect of this invention provides a seamless powder-core wire, which is obtained by wrapping a powder core with an aluminum alloy outer sheath and then forging it. The powder core comprises, by weight percentage: 2%–19.4% Ti powder, 40%–42% ceramic Al2O3 powder, and the balance Al powder. This invention improves the interfacial wettability of the coating by changing the Ti powder content in the powder core, and Ti forms an interface with the ceramic phase, preventing the Al2O3 ceramic powder from detaching. Furthermore, the Ti powder and Al powder undergo solid solution strengthening, precipitating high-hardness intermetallic compounds, significantly increasing the coating hardness and further enhancing its wear resistance.

[0007] Furthermore, the total Ti powder content in the core is 2% to 19.4%, for example, 4%, 6.1%, 8%, 10%, 12%, 12.3%, 13%, 14%, 16%, 19%, etc., preferably 7% to 15%. During the spraying process, Ti powder and Al powder form intermetallic compounds, which can improve the hardness and wear resistance of the coating. However, if the Ti powder content in the core is too high, it will affect the mechanical properties of the coating, such as a decrease in bonding strength. At the same time, it will also form excessive intermetallic compounds, making the coating brittle and prone to cracking or splitting, which is not conducive to maintaining the overall reliability of the coating and affects corrosion resistance. Therefore, it is necessary to ensure the Ti powder content, so that the Al powder and Ti powder form intermetallic compounds, and the Al powder melts and bonds, thereby improving the formability of the coating and thus improving the hardness and wear resistance of the coating.

[0008] Furthermore, the total content of ceramic Al2O3 powder in the powder core is 40% to 42%, for example, 40.1%, 40.3%, 40.5%, 40.7%, 40.9%, 41%, 41.1%, etc., preferably 40.9% to 41.1%.

[0009] Further preferably, the powder core comprises Ti powder with a particle size of 45–86 μm, Al powder with a particle size of 45–86 μm, and ceramic Al2O3 powder with a particle size of 45–96 μm. Furthermore, the Al powder and Ti powder are both gas-atomized spherical powders, and the ceramic Al2O3 powder is mechanically crushed ceramic powder.

[0010] Further preferably, the filling rate of the seamless powder core wire is 50% to 53%, preferably 51% to 52%, such as 51.1%, 51.3%, 51.5%, 51.7%, 51.9%, etc.

[0011] Preferably, the outer sheath of the powder core is an aluminum alloy tube, preferably a 5052 aluminum alloy tube.

[0012] Preferably, the outer sheath is made of 5052 aluminum alloy tubing, which has a Mg content of 2.2% to 2.8%, a Si content of 0.2% to 0.3%, a Cr content of 0.15% to 0.35%, a Cu content of 0.1%, a Mn content of 0.1%, a Fe content of 0.4%, and the balance being Al. The presence of these trace elements gives the 5052 aluminum alloy excellent corrosion resistance in this seamless powder core wire material.

[0013] A second aspect of this invention provides a method for preparing a seamless powder core wire, which involves wrapping the powder core in an aluminum alloy tube and then performing a rotary forging process. The rotary forging process helps ensure a high filling rate, thereby increasing the content of intermetallic compounds in the coating. In this invention, the Ti element content is further modified to optimize the formability and spraying processability of the wire, thereby controlling the size and content of intermetallic compounds, ultimately producing an Al-based composite coating with multi-scale synergistic effects to improve wear resistance.

[0014] Preferably, the method for preparing the seamless powder core wire includes the following steps:

[0015] 1) Mix Al powder, Ti powder and ceramic Al2O3 powder to obtain the powder core;

[0016] 2) The powder core is filled into a 5052 aluminum alloy tube to obtain a powder core wire with an initial diameter;

[0017] 3) The powder core wire with the initial diameter is subjected to rotary forging to reduce its diameter, thereby obtaining a seamless powder core wire.

[0018] Preferably, the number of rotary forging reduction passes is 10 to 16; preferably, the total deformation of the seamless cored wire (controlled by rotary forging) is 89% to 98%; total deformation = (cross-sectional area of ​​initial wire - cross-sectional area of ​​final wire) / cross-sectional area of ​​initial wire. By controlling the number of reduction passes and the deformation amount, the machinability of the cored wire can be optimized. More preferably, the number of rotary forging reduction passes is 14 ± 2. Preferably, the total deformation of the seamless cored wire is 92.6% to 97.2%. More preferably, the total deformation is 96% ± 1%.

[0019] Further preferred, in step 1), Al powder, Ti powder and ceramic Al2O3 powder are mechanically mixed for 30±5 min; and / or, in step 3), a seamless powder core wire with a diameter of 3±0.05 mm is obtained.

[0020] A third aspect of the present invention also provides a multi-scale synergistically reinforced Al-based composite coating, which is obtained by arc spraying using seamless powder core wire or the preparation method of seamless powder core wire described in any one of the above claims.

[0021] Preferably, the arc spraying voltage is 41–46V, the current is 210–260A, the spraying pressure is 0.6–0.9MPa, and the spraying distance is 120–220mm. More preferably, the spraying process parameters are: voltage 42±1V, current 220±10A, spraying pressure 0.8±0.1MPa, and spraying distance 160±40mm. Preferably, the Q235 substrate is sandblasted before spraying, and the sandblasted substrate is cleaned with compressed air. The powder-core wire is fed into the spraying equipment, the spraying parameters are adjusted, and spraying is performed.

[0022] Preferably, in the Al-based composite coating, some Ti elements form a metal / ceramic interface with the ceramic phase, and some Ti elements form a high-hardness intermetallic compound with the Al matrix. Preferably, the volume content of Al₂O₃ in the coating is ≥18%, the volume content of the intermetallic compound formed by Ti elements and the Al matrix is ​​0.6%–9.0%, the hardness of the coating is ≥475.8 HV, and the wear rate of the coating is ≤2.09 × 10⁻⁶. -5 mm 3 / (m·N).

[0023] Further preferably, the volume content of Al2O3 in the coating is 18.1% to 20.9% (e.g., 18.1%, 18.5%, 18.8%, 19%, 19.2%, 19.4%, 19.7%, 20.9%, and any range between these values), and the volume content of the intermetallic compound formed by Ti and the Al matrix in the coating is 4.1% to 9% (e.g., 4.1%, 4.6%, 4.7%, 5.0%, 5.5%, 9%, and any range between these values); the hardness of the coating is 475.8 to 636.4 HV; and the wear rate of the coating is 0.49 × 10⁻⁶. -5 ~2.09×10 -5 mm 3 / (m·N).

[0024] In summary, the seamless powder core wire prepared by this invention has advantages such as high density, good uniformity, and good thermal conductivity. The prepared composite coating has a metal / ceramic interface, an Al2O3 content of 18% to 21%, uniform distribution of Al2O3 ceramic particles, and a certain content of intermetallic compounds. The composite coating has advantages such as high hardness and high wear resistance.

[0025] The beneficial effects of this invention are at least as follows:

[0026] 1. The seamless powder core wire prepared by the present invention has a filling rate of more than 50% by mixing Al powder, Ti powder and ceramic Al2O3 powder and then processing it by rotary forging according to the present invention.

[0027] 2. Using the powder core wire material of the present invention in combination with the process parameters provided by the present invention, an Al-based composite coating containing micron-sized ceramic particles and submicron or nano-sized intermetallic compounds can be prepared.

[0028] 3. The Al-based composite coating prepared by using the powder core wire of the present invention in combination with the process parameters provided by the present invention has an Al2O3 volume content of more than 18%, which is significantly better than the Al2O3 content in the Al-based coating prepared by the traditional rolling and drawing process.

[0029] 4. The Al-based composite coating obtained by using the powder core wire material of the present invention in combination with the preparation process parameters of the present invention can effectively improve the hardness and wear resistance of the coating by the synergistic effect of the multi-scale microstructure in the coating. The average hardness of the coating exceeds 475.8 HV, which is significantly higher than that of the Al / Al2O3 coating without Ti.

[0030] 5. The Al-based composite coating obtained by using the powder core wire material of this invention combined with the preparation process parameters of this invention exhibits excellent wear resistance, with a wear rate of less than 2.09 × 10⁻⁶. -5 mm 3 / (m·N). Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a light microscope image of the Al-based composite coating prepared by arc spraying in Example 3 of the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0034] Unless otherwise specified, specific techniques or conditions in the embodiments of this invention shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Devices, instruments, reagents, etc., whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels. All raw materials used in this invention are readily available in the domestic market.

[0035] The terms "comprising" or "including" in this invention are open-ended descriptions, encompassing the specified components or steps described, as well as other specified components or steps that do not materially affect them. The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, endpoint values ​​of various ranges, endpoint values ​​of various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "specific implementation," or "some specific implementations," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] In the following examples, the rotary forging machine used is a precision rotary forging machine manufactured by Xi'an Innovation Precision Instrument Research Institute. Al powder and Ti powder are both gas-atomized spherical powders, and the ceramic Al2O3 powder is mechanically crushed ceramic powder. In the 5052 aluminum alloy tube, the Mg content is 2.2%–2.8%, the Si content is 0.2%–0.3%, the Cr content is 0.15%–0.35%, the Cu content is 0.1%, the Mn content is 0.1%, the Fe content is 0.4%, and the balance is Al.

[0038] The common parts in the following embodiments are described below:

[0039] 1. Preparation of seamless powder-core wire:

[0040] Step 1: First, seal one end of the 5052 aluminum alloy tube with the initial diameter, and prepare the powder according to the powder core formula described in the following example. Mechanically mix the powder for 30 minutes until the powder is uniformly mixed. Fill the uniformly mixed powder into the 5052 aluminum alloy tube by shaking and filling simultaneously. After filling, seal both ends of the 5052 aluminum alloy tube to obtain the powder core wire with the initial diameter.

[0041] Step 2: Feed the powder core wire with the initial diameter into the rotary forging machine for diameter reduction. By controlling the number of diameter reduction passes and the amount of deformation, the final diameter of the powder core wire is 3.0 mm.

[0042] 2. Coating preparation:

[0043] The coating was prepared using the TLAS-400C high-performance supersonic arc spraying equipment, and the substrate of the sprayed sample was Q235 steel.

[0044] In the following embodiments of the present invention, the content of each powder is a percentage of its total mass in the powder core.

[0045] Example 1

[0046] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 57.1%, Ti powder (45–86 μm): 2.0%, and Al₂O₃ ceramic powder (45–96 μm): 40.9%. The powder core wire filling rate is 51.1%. The rotary forging process involves 14 reduction passes with a total deformation of 96%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0047] Example 2

[0048] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 52.9%, Ti powder (45–86 μm): 6.1%, and Al2O3 ceramic powder (45–96 μm): 41.0%. The powder core wire filling rate is 51.2%. The rotary forging process involves 14 reduction passes with a total deformation of 96%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0049] Example 3

[0050] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 46.6%, Ti powder (45–86 μm): 12.3%, and Al₂O₃ ceramic powder (45–96 μm): 41.1%. The powder core wire filling rate is 51.3%. The rotary forging process involves 14 reduction passes, with a total deformation of 96%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0051] Example 4

[0052] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 39.7%, Ti powder (45–86 μm): 19.4%, and Al2O3 ceramic powder (45–96 μm): 40.9%. The powder core wire filling rate is 51.1%. The rotary forging process involves 14 reduction passes, with a total deformation of 96%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0053] Example 5

[0054] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 46.6%, Ti powder (45–86 μm): 12.3%, and Al₂O₃ ceramic powder (45–96 μm): 41.1%. The powder core wire filling rate is 51.3%. The rotary forging process involves 10 passes of diameter reduction, with a total deformation of 91%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0055] Example 6

[0056] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 46.6%, Ti powder (45–86 μm): 12.3%, and Al₂O₃ ceramic powder (45–96 μm): 41.1%. The powder core wire filling rate is 51.3%. The rotary forging process involves 12 reduction passes, with a total deformation of 92.6%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0057] Example 7

[0058] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 46.6%, Ti powder (45–86 μm): 12.3%, and Al₂O₃ ceramic powder (45–96 μm): 41.1%. The powder core wire filling rate is 51.3%. The rotary forging process involves 16 reduction passes, with a total deformation of 97.2%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0059] Example 8

[0060] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 46.6%, Ti powder (45–86 μm): 12.3%, and Al₂O₃ ceramic powder (45–96 μm): 41.1%. The powder core wire filling rate is 51.3%. The rotary forging process involves 14 reduction passes with a total deformation of 96%. The spraying process parameters are: voltage 41V, current 210A, spraying pressure 0.6MPa, and spraying distance 120mm.

[0061] Example 9

[0062] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 46.6%, Ti powder (45–86 μm): 12.3%, and Al₂O₃ ceramic powder (45–96 μm): 41.1%. The powder core wire filling rate is 51.3%. The rotary forging process involves 14 reduction passes with a total deformation of 96%. The spraying process parameters are: voltage 44V, current 240A, spraying pressure 0.7MPa, and spraying distance 160mm.

[0063] Example 10

[0064] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 46.6%, Ti powder (45–86 μm): 12.3%, and Al₂O₃ ceramic powder (45–96 μm): 41.1%. The powder core wire filling rate is 51.3%. The rotary forging process involves 14 reduction passes with a total deformation of 96%. The spraying process parameters are: voltage 46V, current 260A, spraying pressure 0.9MPa, and spraying distance 220mm.

[0065] Comparative Example 1

[0066] The powder core formulation, by mass percentage, is: Al powder (45-86μm): 100%. Powder core wire filling rate: 48%. Rotary forging process: 14 reduction passes, with a total deformation of 96%. Spraying process parameters are: voltage 42V, current 220A, spraying pressure: 0.8MPa, spraying distance: 160mm.

[0067] Comparative Example 2

[0068] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 59.4%, Ti powder (45–86 μm): 1%, and Al2O3 ceramic powder (45–96 μm): 39.6%. The powder core wire filling rate is 49.5%. The rotary forging process involves 14 reduction passes with a total deformation of 96%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0069] Comparative Example 3

[0070] The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 29.44%, Ti powder (45–86 μm): 30.24%, and Al2O3 ceramic powder (45–96 μm): 40.32%. The powder core wire filling rate is 50.4%. The rotary forging process involves 14 reduction passes, with a total deformation of 96%. The spraying process parameters are: voltage 42V, current 220A, spraying pressure 0.8MPa, and spraying distance 160mm.

[0071] Comparative Example 4

[0072] This comparative example uses a rolling and drawing process to prepare powder-core wires. The powder core formulation, by mass percentage, is: Al powder (45–86 μm): 63.43%, Ti powder (45–86 μm): 8.44%, and Al₂O₃ ceramic powder (45–96 μm): 28.13%. The powder core wire filling rate is 28.9%. The wire diameter is reduced through sequential drawing using a drawing die, resulting in a final wire diameter of 3.0 mm. The spraying process parameters are: voltage 42V, current 220A, spraying pressure: 0.8 MPa, and spraying distance: 160 mm.

[0073] Metallographic observation, hardness, and tribological tests were performed on the coatings prepared in Examples 1-10 and Comparative Examples 1-4. Tribological tests were conducted using an MRH-3 high-speed ring-block tribological testing machine. The grinding ring material was GCr15 with a hardness of 60-62 HRC. The friction method was dry friction, the load was 20 N, and the test time was 60 min. The three-dimensional morphology and wear volume of the worn samples were measured using an Olympus OLS-400 laser confocal microscope. The wear rate of the coating was calculated using the formula (W = V / F × L), where W is the wear rate, V is the wear volume, F is the load, and L is the sliding distance. The hardness of the coating was measured using an HXD-1000 digital microhardness tester. The loading force was 25 gf, and the loading time was 10 s. Ten points were tested for each coating, and the average value was calculated. The metallographic photograph of the coating in Example 3 of this invention is shown below. Figure 1 As shown in the figure, the black areas in the coating are Al2O3 ceramic particles, the bright white areas are AlTi-type intermetallic compounds, and the light gray areas are the Al matrix. The content of high-hardness intermetallic compounds, Al2O3 content, hardness, and wear rate of the coating are shown in Table 1.

[0074] Table 1. Coating performance test results for each embodiment and comparative example.

[0075]

[0076]

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A seamless powder-core filament, characterized in that, The powder core is made by wrapping it with an aluminum alloy outer sheath and then forging it. By mass percentage, the powder core comprises the following components: 7%~15% Ti powder, 40.9%~41.1% ceramic Al2O3 powder, and the balance Al powder; the particle size of the Ti powder is 45~86μm, the particle size of the Al powder is 45~86μm, and the particle size of the ceramic Al2O3 powder is 45~96μm; the forging process involves 12~16 reduction passes, and the total deformation of the seamless powder core wire is 92.6%~97.2%.

2. The seamless powder-core filament according to claim 1, characterized in that, The seamless powder core wire has a filling rate of 50% to 53%.

3. The seamless powder-core filament according to claim 2, characterized in that, The seamless powder core wire has a filling rate of 51% to 52%.

4. The seamless powder-core filament according to claim 1, characterized in that, The outer casing of the powder core is an aluminum alloy tube.

5. The seamless powder-core filament according to claim 4, characterized in that, The outer sheath of the powder core is a 5052 aluminum alloy tube.

6. The method for preparing the seamless powder-core filament according to any one of claims 1-5, characterized in that, The powder core is obtained by wrapping it in an aluminum alloy tube and then performing a rotary forging process.

7. The method for preparing seamless powder-core wire according to claim 6, characterized in that, Includes the following steps: 1) Mix Al powder, Ti powder and ceramic Al2O3 powder to obtain the powder core; 2) The powder core is filled into a 5052 aluminum alloy tube to obtain a powder core wire with an initial diameter; 3) The powder core wire with the initial diameter is subjected to rotary forging to reduce its diameter, thereby obtaining a seamless powder core wire.

8. A multi-scale synergistically reinforced Al-based composite coating, characterized in that, Seamless powder core wires obtained by the preparation method of any one of claims 1-5 or claims 6 or 7 are obtained by arc spraying.

9. The multi-scale synergistically reinforced Al-based composite coating according to claim 8, characterized in that, The voltage of the electric arc spraying is 41~46V, the current is 210~260A, the spraying pressure is 0.6~0.9MPa, and the spraying distance is 120~220mm.

10. The multi-scale synergistically reinforced Al-based composite coating according to claim 8 or 9, characterized in that, The coating has an Al2O3 volume content ≥18%, an intermetallic compound content formed by Ti and the Al matrix of 0.6%~9.0%, a hardness ≥475.8 HV, and a wear rate ≤2.09×10⁻⁶. -5 mm 3 / (m N).

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