A damping composite aluminum plate

Abstract

This invention provides a damping composite aluminum plate, belonging to the field of metal composite material technology. The damping composite aluminum plate comprises a first aluminum plate, a damping adhesive layer, and a second aluminum plate stacked sequentially. Both the first and second aluminum plates have a micro-arc oxidation layer on the side closest to the damping adhesive layer. The damping adhesive layer is made from raw materials containing butyl rubber, epoxy resin, and nano-silica. The micro-arc oxidation layer enhances interfacial bonding, and the optimized composition of the damping adhesive broadens the applicable temperature range for damping performance. Simultaneously, improvements are made to the aluminum plate edge, protective film structure, and mechanical property parameters, resulting in a composite aluminum plate with a peel strength >40 N / cm and a damping factor ≥0.040 at -20~80℃. It exhibits excellent damping performance, mechanical properties, and long-term stability, making it suitable for high-precision stamping and vibration noise reduction applications.

Description

Technical Field

[0001] This invention relates to the field of metal composite materials technology, specifically to a damping composite aluminum plate. Background Technology

[0002] Damping composite aluminum sheets are mainly used in fields requiring both mechanical support and vibration noise reduction (such as automotive interiors, electronic device housings, and rail transit components). Before this technical requirement was established, similar products in the industry often had the following problems: First, the composition and mechanical properties of the aluminum sheets were inconsistent, leading to fluctuations in product support strength and deformation resistance, affecting the adaptability of subsequent stamping, cutting, and other processing. Second, the bonding stability between the aluminum sheet and the damping adhesive layer was poor, easily resulting in problems such as insufficient adhesive and peeling, leading to damping failure. Third, key indicators such as damping performance, surface flatness, and dimensional tolerances lacked unified standards, resulting in poor product consistency and difficulty in meeting the stable use requirements of different scenarios. Fourth, the protective film's protective effect and ease of removal were insufficient, easily causing scratches and adhesive residue on the aluminum sheet surface, increasing subsequent processing and cleaning costs. To solve the above problems, standardize the incoming material quality of damping composite aluminum sheets, and ensure that the products can be stably adapted to downstream processing and end-use, this technical requirement was formulated, clarifying standards across all dimensions from composition, structure, performance to packaging. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects of existing damping composite aluminum plates and to provide a damping composite aluminum plate.

[0004] The specific technical solution is as follows:

[0005] A damping composite aluminum plate includes a first aluminum plate, a damping adhesive layer, and a second aluminum plate stacked sequentially. The chemical composition of the first and second aluminum plates, by mass percentage, satisfies the following: Si≤0.25%, Fe≤0.4%, Cu≤0.1%, Mn≤0.1%, Zn≤0.1%, 2.2%≤Mg≤2.8%, 0.15%≤Cr≤0.35%, with Al as the balance. A micro-arc oxidation layer is provided on both the side of the first aluminum plate closest to the damping adhesive layer and the side of the second aluminum plate closest to the damping adhesive layer. The damping adhesive layer is made of damping adhesive, which includes butyl rubber, epoxy resin, nano-silica, and a curing agent. The total thickness of the damping composite aluminum plate is 1.5±0.05mm, and the peel strength of the damping composite aluminum plate, tested according to GB / T2792-2014 "Test Method for Peel Strength of Adhesive Tapes", is >40N / cm.

[0006] By adopting the above technical solution, the three main layers of the composite aluminum plate ("first aluminum plate - damping adhesive layer - second aluminum plate") are clearly defined. The aluminum plate is limited to a specific chemical composition range. A micro-arc oxidation layer is set at the interface between the aluminum plate and the damping adhesive layer. The key components of the damping adhesive and the total thickness and peel strength requirements of the composite aluminum plate are specified. The aluminum plate meeting the composition requirements provides basic mechanical support for the composite structure; the micro-arc oxidation layer enhances the interfacial bonding between the aluminum plate and the damping adhesive layer, preventing interface separation; the damping adhesive with specific components ensures basic damping performance; and the limitations on total thickness and peel strength ensure product dimensional stability and structural bonding reliability. Ultimately, this results in a composite aluminum plate with good mechanical properties, interfacial bonding strength, and basic damping performance, meeting the core usage requirements of damping composite aluminum plates.

[0007] In the aforementioned damping composite aluminum plate, the thickness of the micro-arc oxide layer is 5-15 μm, and the porosity of the micro-arc oxide layer is 8% to 12%.

[0008] By adopting the above technical solution, the thickness and porosity range of the micro-arc oxidation layer are limited. The micro-arc oxidation layer of a specific thickness can ensure the protection effect on the aluminum plate while avoiding excessive thickness that would affect the overall thickness accuracy of the composite structure. The porosity design allows the damping adhesive to penetrate into the pores of the micro-arc oxidation layer during the composite process, forming an "anchoring effect," thereby further improving the interfacial bonding strength between the aluminum plate and the damping adhesive layer, reducing the risk of interfacial peeling, and enhancing the stability of the composite structure.

[0009] The aforementioned damping composite aluminum plate, wherein, by mass percentage, the raw material composition of the damping adhesive includes: 30%–40% butyl rubber, 20%–30% epoxy resin, 5%–10% nano silica, 3%–5% curing agent, and the remainder being additives; the additives include toughening agents and antioxidants, wherein the toughening agent accounts for 60%–70% of the total mass of the additives, and the antioxidant accounts for 30%–40% of the total mass of the additives.

[0010] The above technical solution clarifies the specific raw material composition ratio and additives of the damping adhesive. Butyl rubber provides excellent basic damping and noise reduction properties for the damping adhesive layer; epoxy resin enhances the mechanical strength and resistance to deformation; nano-silica improves the high-temperature resistance and wear resistance of the adhesive layer; the curing agent ensures the adhesive layer fully cures and solidifies; and the toughening agent and antioxidant optimize the toughness and anti-aging ability of the adhesive layer, respectively. The synergistic effect of these components ultimately comprehensively improves the damping performance, mechanical strength, environmental adaptability, and service life of the damping adhesive layer, thereby ensuring the overall comprehensive performance of the composite aluminum plate.

[0011] The aforementioned damping composite aluminum plate, wherein the yield strength of both the first aluminum plate and the second aluminum plate is ≥90MPa and the elongation is >20%; and after the damping composite aluminum plate undergoes a 180° tensile test at a tensile speed of 50mm / min, its peel strength retention rate is ≥90%.

[0012] By adopting the above technical solution, the yield strength, elongation, and peel strength retention rate of the aluminum plate after tensile test are limited. The higher yield strength and elongation can improve the deformation resistance of the aluminum plate itself, making it less prone to breakage or deformation during stamping and other processing, and adapting to subsequent processing requirements. The high peel strength retention rate after tensile test indicates that the composite aluminum plate can still maintain a stable interfacial bonding state under stress conditions, avoiding structural failure due to external forces and ensuring structural stability during use.

[0013] The aforementioned damping composite aluminum plate, wherein when the length of the damping composite aluminum plate is ≥2m and the width is ≥1.5m, its planar tolerance is <1.5mm; and the surface roughness Ra of the damping composite aluminum plate is ≤0.8μm; and when the damping composite aluminum plate is a coil, its width tolerance is ≤±0.3mm.

[0014] The above technical solution defines the planar tolerance and surface roughness for large-size composite aluminum plates. Narrow planar tolerance can reduce the positioning error of large-size composite aluminum plates in subsequent processing, improve processing accuracy, and adapt to high-precision processing scenarios. Low surface roughness can optimize the surface condition of the aluminum plate. On the one hand, it is conducive to the tight adhesion of the protective film and avoids the formation of air bubbles between the protective film and the aluminum plate, which affects the protective effect. On the other hand, it reduces the interference of surface defects on damping performance and ensures the stability of the damping performance of the composite aluminum plate.

[0015] The aforementioned damping composite aluminum plate further includes a first protective film adhered to the side of the first aluminum plate away from the damping adhesive layer, and a second protective film adhered to the side of the second aluminum plate away from the damping adhesive layer; both the first and second protective films are double-layer structures, including a PET base layer and an acrylic adhesive layer; the thickness of the PET base layer is 25-35μm, and the thickness of the acrylic adhesive layer is 15-25μm; tested according to GB / T2792-2014 standard, with a peeling speed of 300mm / min, the average peeling force of the first and second protective films is 175-180gf, and they can be peeled off within 10 seconds before forging without any adhesive residue.

[0016] Using the above technical solution, a double-layer protective film (PET base layer + acrylic adhesive layer) was designed, and the peel force, removal time, and residue-free requirements of the protective film were limited. The PET base layer can enhance the tear resistance of the protective film, effectively resist the impact of external forces during processing, and ensure the protective effect on the aluminum plate. The parameter design of the acrylic adhesive layer enables the protective film to be removed quickly and without residue, avoiding residual adhesive marks after forging from affecting subsequent processing steps, and improving production efficiency and processing convenience.

[0017] The aforementioned damping composite aluminum plate, tested according to ASTM E756-05 standard, has a damping factor ≥0.040 within a temperature range of -20℃ to 80℃; and after being placed in an environment of 80℃ and 85% relative humidity for 500 hours, its damping factor decreases by ≤3%; the damp heat aging test uses a Shanghai Yiheng LHS-150HC-I constant temperature and humidity chamber, with samples placed in a single layer, flat and unsealed, with a sample spacing ≥5mm to avoid stacking affecting environmental contact.

[0018] By adopting the above technical solution, the damping factor of the composite aluminum plate is limited within a wide temperature range, as well as the decrease in damping factor after humid heat aging. The stable damping factor within the wide temperature range ensures that the composite aluminum plate can continuously exert a stable damping and noise reduction effect under different temperature environments (such as low temperature and high temperature scenarios), breaking the limitation of temperature on damping performance and adapting to diverse application scenarios. The small decrease in damping factor after humid heat aging indicates that the composite aluminum plate can still maintain stable damping performance in harsh environments with high humidity and temperature, reducing performance degradation during long-term use and significantly extending the product's service life.

[0019] The specific operating procedures for damp heat aging tests are as follows:

[0020] Test equipment: Shanghai Yiheng LHS-150HC-I constant temperature and humidity chamber (temperature control accuracy ±0.5℃, humidity control accuracy ±2%RH);

[0021] Sample preparation: Cut the composite aluminum plate into 100mm×50mm samples, a total of 3 pieces, with no scratches or adhesive defects on the surface;

[0022] Placement method: The samples are placed flat in a single layer on the test rack with a spacing of ≥5mm between samples. The rack is not sealed to ensure that the temperature and humidity inside the chamber act evenly on the sample surface.

[0023] Test procedure: First, preheat the constant temperature and humidity chamber to 80℃ and 85% relative humidity, stabilize for 30 minutes, then place the sample in the chamber and time for 500 hours. During this period, record the temperature and humidity data every 100 hours. After the test, take out the sample and place it at room temperature (25℃) for 2 hours. Then test the damping factor according to the ASTM E756-05 standard and calculate the drop.

[0024] In the aforementioned damping composite aluminum plate, the edges of both the first aluminum plate and the second aluminum plate are provided with a chamfer of 45°±5°; the surface of the chamfer is covered with a covering portion formed by the extension of the damping adhesive layer, and the thickness of the covering portion is 0.1~0.2mm.

[0025] By adopting the above technical solution, a chamfered structure for the edge of the aluminum plate was designed, and the chamfered surface was covered by a damping adhesive coating. The chamfered structure can effectively disperse the stress on the edge of the aluminum plate, avoiding edge cracking due to stress concentration during processing or use. The damping adhesive coating can isolate the edge of the aluminum plate from direct contact with the external environment, preventing the edge from being corroded. At the same time, the damping adhesive layer and the edge of the aluminum plate form an integral structure, further enhancing the structural integrity and durability of the composite aluminum plate.

[0026] In the aforementioned damping composite aluminum plate, the grain size of both the first and second aluminum plates is grade 5-8; and the first and second aluminum plates have several pits with a diameter of 1-3 μm on the side near the micro-arc oxide layer, with a pit density of 50-100 pits / mm²; the pits are prepared by a chemical etching process, specifically: the bonding surface of the aluminum plate is immersed in a 10% hydrochloric acid solution at room temperature (25±2℃) for 5 minutes, after etching, it is rinsed with deionized water 3 times for 1 minute each time, and then dried with hot air at 60℃ for 2 minutes to ensure that the pit morphology and density meet the requirements.

[0027] By adopting the above technical solution, the grain size of the aluminum plate is limited, and pits are set on the side of the aluminum plate near the micro-arc oxidation layer. The uniform grain size can ensure that the mechanical properties of each area of ​​the aluminum plate are consistent, avoiding uneven stress on the composite structure due to local performance differences and reducing the risk of structural failure. The pits on the surface of the aluminum plate can increase the contact area with the damping adhesive layer, forming a synergistic effect with the micro-arc oxidation layer, further improving the interfacial bonding strength between the aluminum plate and the damping adhesive layer, and strengthening the stability of the composite structure.

[0028] The pits were created using a chemical etching process, as detailed below:

[0029] Etching reagent: 10% hydrochloric acid solution (analytical grade hydrochloric acid and deionized water at a volume ratio of 1:9);

[0030] Etching conditions: room temperature (25±2℃), immersion time 5 min, gently agitate the solution every 1 min during the process to ensure uniform etching;

[0031] Post-processing: After etching, the aluminum plate is ultrasonically cleaned in deionized water (power 200W, time 3min) to remove residual etching solution on the surface. Then it is dried in a 60℃ hot air drying oven for 2min to avoid moisture residue affecting subsequent micro-arc oxidation treatment.

[0032] Quality inspection: The morphology of the pits is observed using a scanning electron microscope (SEM) to ensure that the diameter is 1-3μm and the density is 50-100 pits / mm². If the requirements are not met, the etching time can be adjusted (error ±1min).

[0033] The aforementioned damping composite aluminum plate further comprises 0.5%–1.5% by mass graphene in the damping adhesive layer; the graphene sheet diameter is 1–5 μm and the thickness is 1–5 nm; the graphene dispersion is ≥90%; the graphene addition process is as follows: first, the graphene is surface modified with KH-550 silane coupling agent (addition amount is 2% of the graphene mass), then mixed with butyl rubber and epoxy resin, ultrasonically dispersed at 300W power for 30 min, and finally nano-silica, curing agent and additives are added and stirred evenly; the thermal conductivity of the damping composite aluminum plate is ≥0.8 W / (m·K).

[0034] By adopting the above technical solution, graphene is added to the damping adhesive layer, and the parameters of graphene and the thermal conductivity of the composite aluminum plate are limited. Graphene has excellent thermal conductivity, and its addition can significantly improve the thermal conductivity of the damping adhesive layer, solving the problems of poor thermal conductivity and easy heat accumulation in traditional damping composite aluminum plates. This enables the composite aluminum plate to have both damping and noise reduction functions, breaking through the limitations of the single function of traditional products and expanding the application scenarios to fields with heat dissipation requirements (such as electronic equipment).

[0035] The specific preparation and addition process of graphene is as follows:

[0036] (1) Surface modification: Take graphene powder, add 2% by mass of KH-550 silane coupling agent (solvent is a mixture of ethanol and water, volume ratio 1:1), stir at 50℃ for 60 min to achieve hydroxylation modification of graphene surface and improve compatibility with organic adhesives.

[0037] (2) Dispersion treatment: The modified graphene was added to the mixture of butyl rubber and epoxy resin (the mass ratio of butyl rubber and epoxy resin was 3:2), and dispersed for 30 minutes using an ultrasonic disperser with a power of 300W. During the dispersion process, the temperature was controlled to be ≤40℃ to avoid premature curing of the adhesive.

[0038] (3) Mixing and molding: After the graphene is evenly dispersed, nano-silica, curing agent and additives are added in sequence. Stir for 20 minutes with a high-speed stirrer (1500 r / min) to form a uniform damping slurry, ensuring that the graphene dispersion is ≥90% (the particle size distribution uniformity deviation is ≤10% as detected by a laser particle size analyzer).

[0039] The aforementioned damping composite aluminum plate, wherein the micro-arc oxidation layer is doped with 1% to 3% by mass of alumina, and the alumina particle size is 0.5-2μm; the micro-arc oxidation process is as follows: the aluminum plate is placed in a sodium silicate-potassium hydroxide composite electrolyte, powered by a pulse power supply with a forward voltage of 50-60V, a reverse voltage of 10-15V, a current density of 5-8A / dm², and a processing time of 15-25min; after oxidation, it is rinsed with deionized water and dried with hot air at 60℃ to ensure that the thickness of the micro-arc oxidation layer is 5-15μm and the porosity is 8% to 12%; wherein, the sodium silicate-potassium hydroxide composite electrolyte is prepared by adding 5-10g / L sodium silicate nonahydrate and 1-5g / L potassium hydroxide at room temperature to avoid excessive corrosion of the aluminum plate due to high temperature; the interfacial bonding strength between the micro-arc oxidation layer and the damping adhesive layer is ≥50MPa.

[0040] By adopting the above technical solution, alumina is doped into the micro-arc oxidation layer, and the parameters of alumina and the interfacial bonding strength are limited. Alumina can enhance the hardness and wear resistance of the micro-arc oxidation layer, improve the protective ability of the micro-arc oxidation layer on the aluminum plate surface, and reduce wear or scratches on the aluminum plate surface. At the same time, the doping of alumina can optimize the interfacial bonding state between the micro-arc oxidation layer and the damping adhesive layer, further improve the interfacial bonding strength between the two, and extend the overall service life of the composite aluminum plate.

[0041] The present invention has the following beneficial effects:

[0042] 1. Significantly improved interfacial bonding strength: By setting a micro-arc oxidation layer (containing a porous structure) on the surface of the aluminum plate and combining it with the pit design on the surface of the aluminum plate, the damping adhesive layer and the aluminum plate form an "anchoring-penetration" bonding structure, with an interfacial bonding strength ≥50MPa, which is more than 25% higher than the existing technology, effectively avoiding interfacial peeling.

[0043] 2. Stable damping performance over a wide temperature range: By optimizing the composition of the damping adhesive (butyl rubber + epoxy resin + nano silica + graphene), the damping factor of the composite aluminum plate is ≥0.040 in the range of -20~80℃, and the damping factor decreases by ≤3% after damp heat aging, thus solving the problem that the damping performance of the existing technology is greatly affected by temperature.

[0044] 3. Optimized structural stability and ease of use: The aluminum plate edge chamfering + damping adhesive coating design prevents edge cracking, the double-layer protective film can be removed without residue within 5 seconds, and the plane tolerance <1.5mm (for large sizes) and low surface roughness (Ra≤0.8μm) improve processing adaptability;

[0045] 4. Multifunctional expansion: The addition of graphene increases the thermal conductivity to ≥0.8W / (m·K), combining damping and noise reduction with heat dissipation, thus expanding the application scenarios to the field of electronic devices. Attached Figure Description

[0046] Figure 1 A three-dimensional structural schematic diagram of the damping composite aluminum plate provided in an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the planar structure of the damping composite aluminum plate provided in an embodiment of the present invention. Detailed Implementation

[0048] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0049] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this application. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0050] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0051] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] See attached document Figure 1-2 The following five specific embodiments are provided in this detailed implementation.

[0053] Example 1: Basic General-Purpose Damping Composite Aluminum Plate

[0054] I. Technical Solution

[0055] 1. Main structure: It adopts a three-layer composite structure of "first aluminum plate - damping adhesive layer - second aluminum plate", which is completely consistent with the basic architecture of "aluminum plate + adhesive layer + aluminum plate" in this application.

[0056] 2. Aluminum plate parameters:

[0057] Composition (mass percentage): Si=0.20%, Fe=0.35%, Cu=0.08%, Mn=0.06%, Zn=0.07%, Mg=2.5%, Cr=0.25%, Al balance;

[0058] Thickness: 0.72mm for a single layer of aluminum sheet, and 1.44mm for two layers (with reserved adhesive layer thickness).

[0059] 3. Damping adhesive layer: Damping adhesive film, 0.06mm thick. Before lamination, the surface of the adhesive film is wiped with a lint-free cloth to remove dust and impurities.

[0060] 4. Composite process: Hot pressing is used, with a hot pressing temperature of 120℃, a pressure of 0.8MPa, and a holding time of 15min to ensure that the adhesive layer is tightly bonded to the aluminum plate.

[0061] 5. Dimensions and tolerances:

[0062] Specifications: Sheet material 1m × 0.8m (length and width to be determined according to actual requirements);

[0063] Tolerances: Length and width tolerance ±0.4mm, total thickness 1.50mm.

[0064] 6. Protective film and appearance:

[0065] Protective film: Made of transparent PET material, it is adhered to the outer surface of the first and second aluminum plates to ensure that it is "flat, wrinkle-free, and bubble-free";

[0066] Appearance control: Through visual and tactile inspection, ensure that "the aluminum plate and the adhesive film are completely bonded, there are no missing adhesive / adhesive threads, and no scratches / dirt that can be felt with fingers".

[0067] Packaging label: Wrapped in waterproof kraft paper and plastic film, labeled "Basic general-purpose damping composite aluminum plate, specifications 1m×0.8m, batch number 20240501".

[0068] II. Working Principle

[0069] Structural bonding principle: The hot pressing process melts and solidifies the specified damping adhesive film between the aluminum plates. The adhesive film's own adhesion is used to achieve interfacial bonding between the aluminum plate and the adhesive layer, forming a stable three-layer composite structure and avoiding problems such as "insufficient adhesive and adhesive layer peeling".

[0070] Damping noise reduction principle: The damping adhesive layer consumes external vibration energy through internal molecular friction, converting vibration into heat energy and dissipating it, thereby achieving the damping noise reduction function. Its performance is controlled by the ASTM E756-05 standard.

[0071] Protection principle: The outer PET protective film isolates the aluminum plate from impurities and mechanical friction during storage and transportation, preventing the appearance of "scratches and dirt" that are prohibited by this application, while meeting the processing requirements of "removable before forging and no residue".

[0072] III. Experimental Data Table 1

[0073]

[0074] IV. Technical Effects

[0075] 1. Basic performance compliance: Because the aluminum plate composition, mechanical parameters and composite structure strictly follow the process requirements, the composite aluminum plate has the basic mechanical support capability to meet the needs of industrial scenarios. It can be directly adapted to conventional stamping and cutting processes without the need for additional process adjustments.

[0076] 2. Structural stability: By using a specified damping adhesive film and a standardized hot-pressing process, the peel strength meets the requirement of ">40N / cm", which avoids the peeling of the aluminum plate and adhesive layer interface during long-term use and ensures the integrity of the composite structure.

[0077] 3. Ease of processing: The protective film meets the requirements of "easy to tear without residue and can be removed within 10 seconds". It can protect the surface of the aluminum plate and can be quickly removed before forging without affecting the efficiency of subsequent processing and reducing the cleaning process caused by residue.

[0078] 4. Damping function meets standards: The damping factor meets the process monitoring requirements, effectively absorbs vibration energy, meets the basic noise reduction requirements of scenarios such as automotive interiors and electronic device housings, and the performance of each batch can be confirmed through client testing to ensure functional reliability.

[0079] Example 2: Coil-type damping composite aluminum plate (suitable for continuous processing)

[0080] I. Technical Solution

[0081] 1. Main structure: a three-layer structure of "first aluminum plate - damping adhesive layer - second aluminum plate", suitable for continuous production of coil materials.

[0082] 2. Aluminum plate parameters:

[0083] Composition (mass percentage): Si=0.22%, Fe=0.38%, Cu=0.09%, Mn=0.08%, Zn=0.09%, Mg=2.3%, Cr=0.20%, Al balance;

[0084] Form: Coil aluminum sheet, single layer thickness 0.73mm, width 1.2m.

[0085] 3. Damping adhesive layer: Damping adhesive film (in roll form, 1.2m wide, matching the aluminum plate), before lamination, the aluminum plate and adhesive film are synchronously conveyed through a tension control system to avoid misalignment.

[0086] 4. Composite process: continuous hot pressing composite, hot press roller temperature 115℃, linear pressure 0.9MPa, conveying speed 1m / min, to ensure uniform curing of the adhesive layer.

[0087] 5. Dimensions and tolerances:

[0088] Specifications: Roll length 50m, width 1.2m;

[0089] Tolerances: Width tolerance ±0.2mm, total thickness 1.50mm (1.5±0.05mm).

[0090] 6. Protective film and packaging:

[0091] Protective film: Roll PET protective film, laminated by a synchronous laminating machine to ensure no wrinkles;

[0092] Packaging: Paper core (inner diameter 150mm) + waterproof membrane wrapping, with markings indicating roll length, width, and batch number.

[0093] II. Working Principle

[0094] Continuous production principle: By controlling the tension and synchronously conveying aluminum plates and film rolls, and cooperating with continuous hot press rollers, the integrated production of "feeding-lamination-coating" is realized, avoiding dimensional deviations in batch production.

[0095] Tolerance control principle: The width tolerance of the roll material is calibrated by the positioning guide roller before hot pressing to ensure that the width deviation per meter is ≤0.2mm, which meets the process roll material tolerance requirements and is suitable for subsequent continuous cutting.

[0096] Protection principle: The protective film of the roll material is synchronously bonded to the composite board to form a roll material structure of "protective film-composite board-protective film", which reduces frictional damage between adjacent layers during storage.

[0097] III. Experimental Data Table 2

[0098]

[0099] IV. Technical Effects

[0100] 1. Continuous processing adaptability: The roll shape and width tolerance of ±0.2mm can be directly connected to automated continuous cutting and stamping equipment without frequent sheet material changes, which significantly improves the efficiency of mass production, especially suitable for the large-scale manufacturing of electronic device housings.

[0101] 2. Dimensional consistency: Through tension control and positioning guide rollers, the width and thickness tolerances of the roll material are stable throughout the entire length range, avoiding an increase in the processing scrap rate due to dimensional fluctuations and ensuring product consistency.

[0102] 3. Convenience of storage: Roll packaging saves storage space, and the waterproof film and paper core protection can prevent the roll from deforming during transportation and reduce logistics losses.

[0103] 4. Stable basic performance: Core parameters such as peel strength and damping factor meet process requirements, improving production efficiency without sacrificing the mechanical and damping functions of the composite aluminum plate.

[0104] Example 3: High mechanical strength HDCA damping composite aluminum plate (suitable for stress scenarios)

[0105] I. Technical Solution

[0106] The core structure is a three-layer structure consisting of a first aluminum plate, a damping adhesive layer, and a second aluminum plate, with an emphasis on optimizing the mechanical properties of the aluminum plate.

[0107] Aluminum plate parameters:

[0108] Composition (mass percentage): Si=0.23%, Fe=0.36%, Cu=0.07%, Mn=0.05%, Zn=0.06%, Mg=2.7% (the maximum Mg content in this application is within 2.8%), Cr=0.30% (the maximum Cr content in this application is within 0.35%), Al balance;

[0109] Process: The aluminum sheet is cold-rolled for strengthening (cold rolling rate 15%), with a single layer thickness of 0.71mm, which improves the yield strength.

[0110] Damping adhesive layer: The damping adhesive film specified in this application (thickness 0.08mm) is degreased with alcohol on the bonding surface of the aluminum plate before lamination to remove oil stains.

[0111] Composite process: hot pressing temperature 125℃, pressure 1.0MPa, holding time 20min, to enhance the interfacial bonding force between the adhesive layer and the aluminum plate.

[0112] Dimensions and appearance: 1.2m×1.0m board, length and width tolerance ±0.3mm (within ±0.5mm of board), total thickness 1.50mm; no tactile scratches or missing glue.

[0113] II. Working Principle

[0114] Aluminum plate strengthening principle: The Mg and Cr contents are taken to be higher within the range. Mg forms a solid solution with Al to strengthen the plate, and Cr refines the aluminum plate grains. Combined with the cold rolling process, the hardness and yield strength of the aluminum plate are further improved, while maintaining the elongation >20% (process requirement).

[0115] Interface enhancement principle: Degreasing treatment of the aluminum plate bonding surface removes oil stains to prevent oil stains from blocking the bonding between the adhesive film and the aluminum plate; high-pressure hot pressing allows the adhesive film to fully fill the tiny depressions on the surface of the aluminum plate, forming a "mechanical interlocking" effect and improving the peel strength.

[0116] III. Experimental Data Table 3

[0117]

[0118] IV. Technical Effects

[0119] High stress adaptability: The aluminum sheet is optimized in composition and strengthened by cold rolling, which significantly improves the yield strength. This makes the composite aluminum sheet suitable for automotive chassis, rail transit interiors and other scenarios that need to withstand greater pressure or impact, and it is not easy to deform during stamping or break during use.

[0120] More stable interface: Degreasing treatment and high-pressure hot pressing further improve peel strength, making it less likely for the aluminum plate and adhesive layer to separate even under stress or vibration conditions, thus ensuring the long-term reliability of the composite structure.

[0121] Functional compatibility: While improving mechanical strength, the damping factor still meets the process requirements, achieving the dual functions of "high mechanical strength + damping and noise reduction", avoiding the loss of damping performance due to the strengthening of aluminum plate.

[0122] Example 4: HDCA damping composite aluminum plate with stable damping performance (emphasis on batch consistency)

[0123] I. Technical Solution

[0124] The core structure is a three-layer structure consisting of a "first aluminum plate - damping adhesive layer - second aluminum plate", with a focus on controlling the batch consistency of the damping adhesive film.

[0125] Aluminum plate parameters:

[0126] Composition (mass percentage): Si=0.21%, Fe=0.37%, Cu=0.08%, Mn=0.07%, Zn=0.08%, Mg=2.4%, Cr=0.22%, Al balance;

[0127] Thickness: 0.72mm for a single layer, 1.50mm for the total thickness.

[0128] Damping adhesive layer:

[0129] The same batch of damping adhesive film specified in this application was selected, and the initial viscosity of each roll of film was tested with a viscometer before use to ensure that the viscosity deviation within the batch was ≤5%.

[0130] Composite process: constant temperature hot pressing (temperature 120℃±2℃) to avoid uneven curing of the adhesive layer due to temperature fluctuations.

[0131] Quality control:

[0132] For every 10 sheets produced, one sheet is randomly selected and its damping factor is tested according to ASTM E756-05 standard.

[0133] After each batch of production is completed, 2 pieces of finished product are randomly selected according to the process requirements and sent to the client for testing and confirmation.

[0134] Record the batch number of adhesive film and hot pressing parameters for each sheet material to form a traceable ledger.

[0135] II. Working Principle

[0136] The principle of stable damping performance: The formulation and viscosity of the damping film in the same batch are highly consistent, avoiding the fluctuation of damping factor caused by the difference in composition between different batches of film; constant temperature hot pressing ensures that the curing degree of the adhesive layer of each board is uniform, further reducing the deviation of damping performance.

[0137] Quality traceability principle: By recording the batch and process parameters of the adhesive film in the ledger, if damping performance problems occur later, the cause can be quickly located (such as abnormal adhesive film batch or hot pressing temperature fluctuation), thus achieving precise control.

[0138] III. Experimental Data Table 4

[0139]

[0140] IV. Technical Effects

[0141] Consistent damping performance: The damping factor fluctuates little within a batch, ensuring that products manufactured at different times can achieve consistent noise reduction effects under the same vibration scenarios (such as vibration reduction of precision instruments), avoiding differences in equipment noise caused by performance fluctuations.

[0142] Quality controllability: By conducting sampling inspections and confirming with the client, a closed loop of "production-inspection-traceability" is formed, reducing the risk of returns due to substandard damping performance and enhancing customer trust.

[0143] Process stability: Constant temperature hot pressing and pre-inspection of the adhesive film standardize the production process, reduce quality problems caused by human operation or equipment fluctuations, and ensure the stability of mass production.

[0144] Example 5: Large-size, high-precision HDCA damping composite aluminum plate (suitable for large components)

[0145] I. Technical Solution

[0146] Core structure: a three-layer structure consisting of "first aluminum plate - damping adhesive layer - second aluminum plate", designed for large-size plates of 2.0m × 1.8m.

[0147] Aluminum plate parameters:

[0148] Composition (mass percentage): Si=0.24%, Fe=0.39%, Cu=0.09%, Mn=0.09%, Zn=0.07%, Mg=2.6%, Cr=0.28%, Al balance;

[0149] Dimensions: Large aluminum plate substrate 2.5m×2.0m, single layer thickness 0.70mm.

[0150] Damping adhesive layer: The damping adhesive film specified in this application (cut to 2.5m×2.0m) is used to fix the aluminum plate and the adhesive film with positioning fixtures before lamination to ensure that the alignment deviation is ≤0.5mm.

[0151] Composite process:

[0152] Segmented hot pressing: Divide the large sheet material into 4 zones (1.25m×1.0m / zone), and hot press each zone sequentially (temperature 122℃, pressure 0.95MPa, holding pressure for 18min).

[0153] Cold pressing: Cold pressing is performed immediately after hot pressing (pressure 0.5MPa, temperature 25℃, time 10min) to reduce thermal deformation.

[0154] Dimensions and flatness:

[0155] Cutting: The CNC cutting machine cuts to 2.0m × 1.8m, with real-time monitoring of length and width tolerances;

[0156] Flatness inspection: One inspection point is set every 0.5m × 0.5m, for a total of 16 points, to ensure that the flatness tolerance is <2mm.

[0157] II. Working Principle

[0158] Large-size deformation control principle: segmented hot pressing avoids warping of large-size plates caused by uneven temperature distribution during a single hot pressing; cold pressing and shaping suppresses the springback of aluminum plates after thermal expansion and contraction, ensuring flatness.

[0159] Dimensional accuracy control principle: The positioning fixture ensures that the aluminum plate and the adhesive film are aligned before the composite process, and the CNC cutting machine compensates for the tolerance in real time to avoid dimensional deviations in large-size cutting.

[0160] III. Experimental Data Table 5

[0161]

[0162] IV. Technical Effects

[0163] Large size adaptability: By segmented hot pressing and cold pressing for shaping, the problem of warping of large-size sheet materials is solved. The flatness and length and width tolerances meet the process requirements. It can be directly adapted to large-size components that do not require splicing, such as large equipment shells and rail transit car interiors, reducing performance risks caused by splicing seams.

[0164] Assembly accuracy: Multi-point flatness inspection ensures that all areas of large-size sheet metal are flat, avoiding assembly gaps caused by local warping, improving the fitting accuracy with other components, and reducing subsequent grinding and adjustment processes.

[0165] Structural integrity: The large-size adhesive film is precisely aligned with the aluminum plate, and the adhesive layer is evenly distributed to avoid damping failure or peeling caused by local missing adhesive layers, thus ensuring the overall performance of large-size components.

[0166] Example 6: Graphene-containing damping composite aluminum plate

[0167] 1. Technical Solution:

[0168] Main structure: a three-layer structure consisting of "first aluminum plate - damping adhesive layer (containing graphene) - second aluminum plate";

[0169] Aluminum plate parameters: Composition (mass percentage): Si=0.22%, Fe=0.36%, Cu=0.08%, Mn=0.07%, Zn=0.08%, Mg=2.5%, Cr=0.25%, Al balance; Single layer thickness 0.71mm, grain size grade 6, pits (diameter 2μm, density 80 pits / mm²) are prepared by chemical etching on the side near the damping adhesive layer, and a micro-arc oxide layer (thickness 10μm, porosity 10%, doped with 2% aluminum oxide) is set on the surface of the pits;

[0170] Damping adhesive layer: 35% butyl rubber, 25% epoxy resin, 8% nano silica, 4% curing agent, 1.0% graphene (sheet diameter 3μm, thickness 3nm), 6.5% additives (65% toughening agent, 35% antioxidant); prepared according to the supplementary graphene addition process, adhesive layer thickness 0.08mm;

[0171] Composite process: hot pressing temperature 120℃, pressure 0.9MPa, holding time 18min;

[0172] Dimensions and tolerances: Sheet material 1.0m×0.8m, length and width tolerance ±0.3mm, total thickness 1.50mm (1.5±0.05mm).

[0173] 2. Experimental Data Table 6

[0174]

[0175] 3. Technical Effects

[0176] Thermal conductivity meets standards: thermal conductivity 0.85W / (m·K), meeting the heat dissipation requirements of electronic device housings and other scenarios, and solving the limitation of traditional damping composite aluminum plates that "only reduce noise and do not dissipate heat";

[0177] Stable damping performance: After damp heat aging, the damping factor decreased from 0.048 to 0.047, a decrease of only 2.1%, which meets the requirement of ≤3%. The damping function has little decay during long-term use.

[0178] Reliable interface bonding: The graphene is uniformly dispersed, and with the "anchoring effect" of the pits and micro-arc oxidation layer, the peel strength reaches 47 N / cm, which is higher than the standard requirement, thus avoiding interface peeling.

[0179] The specific data of the damp heat aging experiments in Examples 1-6 are shown in the table below:

[0180]

[0181] The damping factor decreased by ≤3% in all embodiments, verifying the stability of the damp heat aging performance in this application and ensuring that the technical solution is reproducible.

[0182] In summary, the working principle of the damping composite aluminum plate provided in this embodiment is as follows:

[0183] 1. Structural Support Principle: A three-layer composite structure of "aluminum plate-adhesive layer-aluminum plate" is adopted, where the aluminum plate is specified, and the content range of elements such as Si, Fe, Cu, Mg, and Cr is limited. Simultaneously, mechanical parameters such as yield strength and elongation are clearly defined. This design allows the aluminum plate to form a stable metallic crystal structure based on specific components. Combined with the required mechanical properties, this provides reliable rigid support and deformation resistance for the entire composite structure, avoiding problems such as breakage and dents during processing or use.

[0184] 2. Damping Noise Reduction Principle: The adhesive layer in the composite structure can convert externally transmitted vibration energy into heat energy and dissipate it through internal molecular friction, thereby achieving vibration noise reduction. Monitoring of the damping factor (tested according to ASTM E756-05) in the technical requirements ensures the stability of the adhesive layer's damping performance and avoids noise reduction failure due to substandard adhesive layer performance.

[0185] 3. Interface stability principle: The technical requirements clearly define the standards for "peel strength of composite aluminum plate" and "adhesive film bonding quality" (such as complete bonding between aluminum plate and adhesive film with no missing adhesive). By limiting the type of adhesive layer and bonding effect, it is ensured that the adhesive film can form a tight interface bond with the surface of aluminum plate, reducing interface peeling caused by factors such as vibration and temperature changes, and ensuring the integrity of the three-layer structure.

[0186] 4. Performance Control Principle: Corresponding testing methods are set for each key indicator (such as direct reading spectroscopy / ICP testing of aluminum plate composition, universal testing machine testing of yield strength and peel strength, and taper ruler testing of plane tolerance). Through full-process testing and monitoring, it is ensured that the composition, mechanical properties, damping performance, dimensional accuracy, etc. of each batch of products meet the requirements, and performance fluctuations are avoided from affecting downstream use.

[0187] How to use

[0188] Based on process requirements, the use of damping composite aluminum plates must follow the process of "incoming material acceptance - processing operation - usage monitoring", as follows:

[0189] 1. Incoming material inspection process:

[0190] First, check the packaging and labeling: confirm that the packaging is intact, the quantity is accurate, and the labeling is clear to avoid misuse or mixing due to transportation damage or unclear labeling;

[0191] Secondly, key performance tests are conducted: according to the testing methods required by the technical requirements, samples are tested for aluminum plate composition (direct reading spectrum / ICP), aluminum plate yield strength and elongation (universal testing machine), composite plate peel strength (universal testing machine), surface flatness (taper ruler), appearance (visual inspection + touch), dimensional tolerance (calipers / measuring tape), protective film quality (visual inspection + touch), etc., to ensure that the incoming materials meet the standards before proceeding to the next stage.

[0192] 2. Processing operation steps:

[0193] Protective film treatment: Before stamping, cutting and other processing, the protective film on the surface of the aluminum plate is removed. The technical requirements that "the protective film should not be damaged or fall off before stamping, and should be easy to tear without leaving any residue" ensure that the aluminum plate surface is not damaged during the removal process and there is no residue, so no additional cleaning is required.

[0194] Dimensioning: According to actual needs, cut or stamp according to the standard of "sheet material tolerance ±0.5mm, coil material tolerance ±0.3mm" to ensure that the dimensions of the processed products meet the assembly requirements and avoid assembly gaps due to dimensional deviations.

[0195] 3. Usage and monitoring:

[0196] End-use: The processed damping composite aluminum plate is assembled into target components (such as automotive interior panels and electronic device housings) to achieve structural stability and vibration suppression by utilizing its synergistic function of "mechanical support + damping noise reduction".

[0197] Damping performance monitoring: In accordance with the technical requirement of "providing 2 pieces of finished products per batch to the client for testing and confirmation of the damping factor", the damping performance is monitored regularly to ensure that the damping function does not decay during long-term use.

[0198] Overall technical effect

[0199] 1. Stable and reliable mechanical support: By limiting the composition range of the aluminum plate (e.g., 2.2%≤Mg≤2.8%, 0.15%≤Cr≤0.35%) and the requirements for yield strength and elongation, the aluminum plate is ensured to have uniform and sufficient rigidity and resistance to deformation. It can stably withstand the impact pressure during processing and the external load during use, avoiding structural failure problems such as fracture and dent, and meeting the mechanical requirements of downstream processing and end use.

[0200] 2. Continuously effective damping function: Specify the damping adhesive film and monitor the damping factor to ensure that the adhesive layer can stably dissipate vibration energy through molecular friction, thereby achieving a continuous noise reduction effect; at the same time, the bonding requirement of "no missing adhesive and no peeling" avoids the local failure of the damping function due to interface separation, ensuring the stability of the overall noise reduction performance.

[0201] 3. Excellent processing adaptability: Clear dimensional tolerances (separately defined for sheet / coil materials) and surface flatness requirements ensure that the product can be accurately adapted to stamping, cutting and other processing procedures, reducing the scrap rate caused by dimensional deviations or insufficient flatness; the "easy-tear and residue-free" protective film design further simplifies the processing process, reduces cleaning costs and improves processing efficiency.

[0202] 4. Surface quality and protection: Appearance standards (no scratches, no dirt, no tactile particles) and protective film requirements ensure that the aluminum plate surface remains intact during storage, transportation, and processing, avoiding surface defects that could affect the product's aesthetics and safety. At the same time, the protective film's "unbreakable before forging" characteristic can effectively resist external friction damage before processing.

[0203] 5. Strong product consistency and traceability: Comprehensive testing methods and the requirement of "clear packaging and labeling" ensure that the composition, performance, and size of each batch of products meet the standards, avoiding performance fluctuations between batches; clear labeling and batch damping factor sampling and monitoring also facilitate product quality traceability and reduce subsequent risks caused by quality problems.

[0204] In summary, this damping composite aluminum plate can achieve a comprehensive effect of "mechanical support + damping and noise reduction + convenient processing + stable quality", making it fully suitable for downstream application scenarios that require both structural stability and vibration suppression.

[0205] Furthermore, the damping factor η(T) of this damping composite aluminum plate satisfies the following equation in the temperature range of -20℃ to 80℃:

[0206] ;

[0207] in:

[0208] η(T): Damping factor at temperature T;

[0209] η0: Reference damping factor, with a value of 0.040 to 0.052;

[0210] T0: Optimal damping temperature, ranging from 25℃ to 30℃;

[0211] σ: Damping temperature distribution width parameter, with a value of 18 to 22;

[0212] α: Micro-arc oxidation layer structure enhancement coefficient, with a value of 0.015 to 0.025;

[0213] S p : Porosity of micro-arc oxidation layer (%)

[0214] d mao : Thickness of micro-arc oxide layer (μm);

[0215] d total Damping adhesive layer thickness (mm);

[0216] β: Temperature decay coefficient, with a value of 0.001 to 0.002.

[0217] Equation derivation process:

[0218] The equation consists of the following three parts:

[0219] 1. Gaussian function part:

[0220] ;

[0221] This describes the natural decay behavior of the damping factor with temperature change, reflecting the thermal sensitivity of the damping adhesive material itself.

[0222] 2. Structural reinforcement components:

[0223] ;

[0224] This reflects the enhancing effect of the porosity and thickness of the micro-arc oxide layer on interfacial bonding and damping performance.

[0225] 3. Temperature stability correction item:

[0226] (1-β·∣T-T0∣);

[0227] This invention demonstrates the improved temperature stability achieved through component optimization (such as the addition of nano-silica and graphene).

[0228] Example (taking Example 1 as an example):

[0229] Assume the following parameter values: η0 = 0.05; T0 = 28℃; σ = 20; α = 0.02; S p =10%; d mao=10μm;

[0230] d total =0.06mm; β=0.0015; then at T=50℃:

[0231] ;

[0232] The calculation yields:

[0233] η(50)≈0.0452;

[0234] Meets the requirements (≥0.040).

[0235] Technical effects:

[0236] 1. Quantitative damping performance: The relationship between damping factor and temperature and structural parameters is clarified through equations, which facilitates product design and quality control;

[0237] 2. Demonstrates structural innovation: The equation includes parameters for the micro-arc oxidation layer, highlighting its synergistic reinforcing effect with the damping adhesive layer;

[0238] 3. Temperature stability characterization: The stability of the damping performance of this invention over a wide temperature range is demonstrated by the β term;

[0239] 4. Can be used for simulation and optimization: This equation can be used for CAE analysis or process parameter optimization to improve product development efficiency.

[0240] Working principle and process:

[0241] Temperature change → affects the movement of damping adhesive molecular chains → damping factor naturally decreases (Gaussian term).

[0242] The micro-arc oxidation layer provides an anchoring effect, which enhances interfacial bonding and improves damping performance (structural reinforcement).

[0243] Nano-SiO2 / graphene improves thermal stability → suppresses high-temperature performance degradation (temperature correction term) → the final output composite aluminum plate has a damping factor ≥0.040 within the range of -20 to 80℃.

[0244] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A damping composite aluminum plate, characterized in that, The system comprises a first aluminum plate, a damping adhesive layer, and a second aluminum plate stacked sequentially. By mass percentage, the chemical composition of the first and second aluminum plates satisfies the following: Si≤0.25%, Fe≤0.4%, Cu≤0.1%, Mn≤0.1%, Zn≤0.1%, 2.2%≤Mg≤2.8%, 0.15%≤Cr≤0.35%, with Al as the balance. Both the first aluminum plate and the second aluminum plate near the damping adhesive layer have a micro-arc oxidation layer. The damping adhesive layer is made of damping adhesive comprising butyl rubber, epoxy resin, nano-silica, and a curing agent. The total thickness of the damping composite aluminum plate is 1.5±0.05mm, and according to GB / T2792-2014 standard, the peel strength of the damping composite aluminum plate is >40N / cm. The thickness of the micro-arc oxidation layer is 5-15μm, and the porosity of the micro-arc oxidation layer is 8%~12%. The damping adhesive comprises, by weight percentage: 30%–40% butyl rubber, 20%–30% epoxy resin, 5%–10% nano silica, 3%–5% curing agent, and the remainder being additives; the additives include toughening agents and antioxidants, wherein the toughening agents account for 60%–70% of the total mass of the additives, and the antioxidants account for 30%–40% of the total mass of the additives; The first and second aluminum plates both have a grain size of 5-8; and the first and second aluminum plates have a plurality of pits with a diameter of 1-3 μm on the side near the micro-arc oxide layer, with a density of 50-100 pits / mm. 2 The damping adhesive layer also contains 0.5% to 1.5% by mass graphene; the graphene sheet has a diameter of 1-5 μm and a thickness of 1-5 nm; and the thermal conductivity of the damping composite aluminum plate is ≥0.8 W / (m·K). The damping factor η(T) of the damping composite aluminum plate satisfies the following equation in the temperature range of -20℃ to 80℃: ,in: η(T) is the damping factor at temperature T; η0 is the reference damping factor, with a value of 0.048 to 0.

052. T0 is the optimal damping temperature, ranging from 25℃ to 30℃; σ is the damping temperature distribution width parameter, ranging from 18 to 22; α is the micro-arc oxidation layer structure enhancement coefficient, ranging from 0.015 to 0.025; S p The porosity of the micro-arc oxide layer is expressed in %; d mao The thickness of the micro-arc oxide layer is expressed in μm; d total β is the thickness of the damping adhesive layer, in mm; β is the temperature decay coefficient, ranging from 0.001 to 0.

002.

2. The damping composite aluminum plate according to claim 1, characterized in that, The yield strength of both the first and second aluminum plates is ≥90MPa and the elongation is >20%; and the peel strength retention rate of the damping composite aluminum plate is ≥90% after a 180° tensile test at a tensile speed of 50mm / min.

3. The damping composite aluminum plate according to claim 1, characterized in that, When the length of the damping composite aluminum plate is ≥2m and the width is ≥1.5m, its plane tolerance is <1.5mm; and the surface roughness Ra of the damping composite aluminum plate is ≤0.8μm.

4. The damping composite aluminum plate according to claim 1, characterized in that, It also includes a first protective film adhered to the side of the first aluminum plate away from the damping adhesive layer, and a second protective film adhered to the side of the second aluminum plate away from the damping adhesive layer; both the first and second protective films are double-layer structures, including a PET base layer and an acrylic adhesive layer; the thickness of the PET base layer is 25-35μm, and the thickness of the acrylic adhesive layer is 15-25μm; tested according to GB / T2792-2014 standard, with a peeling speed of 300mm / min, the average peeling force of the first and second protective films is 175-180gf, and they can be peeled off within 10 seconds before forging without any adhesive residue.

5. The damping composite aluminum plate according to claim 1, characterized in that, According to the ASTM E756-05 standard, the damping composite aluminum plate has a damping factor ≥0.040 in the temperature range of -20℃ to 80℃; and after being placed in an environment of 80℃ and 85% relative humidity for 500 hours, its damping factor decreases by <3%.

6. The damping composite aluminum plate according to claim 1, characterized in that, The edges of the first aluminum plate and the second aluminum plate are both chamfered at 45°±5°; the surface of the chamfer is covered with a covering portion formed by the extension of the damping adhesive layer, and the thickness of the covering portion is 0.1 to 0.2 mm.

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