A foamed aluminum filled composite material and its preparation method

Abstract

This invention provides a method for preparing aluminum foam-filled composite materials, specifically including the following steps: S1, obtaining through holes in aluminum foam material using laser drilling or stamping; S2, filling molten polyurethane or molten rubber into the through holes of step S1 using a pressure filling method; S3, placing the aluminum foam material filled with molten polyurethane or molten rubber in a vacuum chamber, simultaneously evacuating the vacuum and heating it, and after a curing reaction, slowly releasing the vacuum and cooling it to obtain the aluminum foam-filled composite material. Compared with the prior art, this invention obtains through holes in aluminum foam material by laser drilling or stamping, then fills the through holes with molten polyurethane or molten rubber, and finally heats and cures to obtain polyurethane or rubber-filled aluminum foam-filled composite materials, which can improve the interfacial compatibility between aluminum foam and the filler material, ensuring that the composite material has excellent performance.

Description

Technical Field

[0001] This invention relates to the field of energy-absorbing materials technology, and more specifically, to a foamed aluminum-filled composite material and its preparation method. Background Technology

[0002] Aluminum foam-filled composites, as an advanced lightweight porous material, have shown great application potential in multiple fields due to their unique microstructure. These materials not only possess lightweight, high specific strength, and good corrosion resistance, but also offer excellent sound absorption, energy absorption capacity, and thermal insulation. However, to meet broader application needs, especially in industries with higher requirements for thermal insulation, energy absorption, and acoustic properties, such as aerospace, automotive, construction, and military fields, the performance of existing aluminum foam-filled composites needs further optimization. Although aluminum foam-filled composites perform well in many aspects, their performance still has room for improvement. Specifically, while aluminum foam exhibits outstanding energy absorption performance, its energy absorption efficiency and reusability may be limited under high-intensity impacts, affecting its long-term reliability in high-energy absorption applications.

[0003] Polyurethane materials typically have open or closed microporous structures. This structure can absorb a large amount of energy through the deformation of the pores when subjected to impact, similar to a spring system with many small air bladders. When polyurethane materials are subjected to force, the chemical bonds and intermolecular forces inside them deform, converting kinetic energy into heat energy, thereby absorbing impact energy and slowing down the transmission of impact force. Compared to perfectly elastic materials, polyurethane undergoes plastic deformation when subjected to a large impact, which allows it to absorb more energy without immediately rebounding, thus reducing the impact force transmitted to the structure or human body.

[0004] Therefore, existing technologies typically produce aluminum foam-filled composite materials by coating the surface of aluminum foam with polyurethane. For example, patent application CN201910025926.9 discloses an aluminum foam-filled composite material for automotive bumpers, which uses polyurethane to coat the aluminum foam. However, this surface coating method easily leads to interfacial incompatibility between the polyurethane and the aluminum foam. Any interfacial defects or poor adhesion will affect the overall performance of the composite material, especially under impact or cyclic loading conditions. Therefore, the commonly used coating method clearly cannot meet the requirements. Summary of the Invention

[0005] This invention provides a foamed aluminum filled composite material and its preparation method. The aim is to maintain the original advantages of foamed aluminum, and after obtaining through holes in the foamed composite material by laser drilling or punching, fill the through holes with polyurethane or rubber. This not only further enhances the specific properties of the material, but also avoids the interface incompatibility problem that occurs in commonly used coating methods.

[0006] The first objective of this invention is to provide a method for preparing aluminum foam-filled composite materials, the method specifically comprising the following steps:

[0007] S1. Through holes are obtained in aluminum foam material by laser drilling or punching.

[0008] S2. Use pressure filling method to fill the through hole in step S1 with molten polyurethane or molten rubber;

[0009] S3. Place the foamed aluminum material filled with molten polyurethane or molten rubber in a vacuum chamber, heat it up while evacuating the vacuum, and slowly release the vacuum and cool it down after the curing reaction to obtain the foamed aluminum filled composite material.

[0010] Compared with existing technologies, this invention creates through-holes in aluminum foam material through laser drilling or stamping, then fills these through-holes with molten polyurethane or molten rubber, and finally cures them at a high temperature to obtain a polyurethane or rubber-filled aluminum foam composite material. The use of laser drilling or stamping to create through-holes in the aluminum foam allows for precise control of the hole size, shape, and distribution, which helps improve the uniformity of the filler and the effectiveness of interfacial contact. The pressure filling method ensures that the molten polyurethane or molten rubber completely fills the pores of the aluminum foam, avoiding air residue, thereby enhancing the physical interlocking between the polyurethane or rubber and the aluminum foam and improving interfacial adhesion. In summary, the entire process, from drilling and pressure filling to curing at a high temperature, improves the interfacial compatibility between the aluminum foam and the filler material, ensuring the composite material has excellent performance.

[0011] In some embodiments, in step S1, the aluminum foam material undergoes pretreatment. The pretreatment step is as follows: covering the visible surface of the aluminum foam material except for the inner surface of the through hole with masking tape, adding epoxy resin to the atomizing spraying device for atomization treatment, and then spraying a film onto the inner surface of the through hole.

[0012] Compared to existing technologies, this invention pre-treats the aluminum foam material, covering the surface of the through-holes with an epoxy resin coating to form a reinforced interface. This significantly improves the adhesion to polyurethane or rubber. The adhesive properties, chemical resistance, and mechanical strength of epoxy resin make it an ideal intermediate layer material, significantly enhancing the overall performance of the composite material. Thus, in the final lamination process, the polyurethane or rubber bonds tightly with the epoxy resin layer within the pre-treated aluminum foam through-holes, forming a robust composite structure suitable for applications requiring high bonding strength and good mechanical properties.

[0013] In some embodiments, the power of the atomization process is 600-700W.

[0014] Compared with the prior art, the present invention performs atomization under high power conditions, which helps to generate sufficiently fine droplets to ensure the uniformity and quality of the coating.

[0015] In some embodiments, the parameters for the spray coating are as follows: flow rate of 3-5 ml / min, height of 2-3 cm, spraying speed of 15-20 mm / s, and ambient temperature of 60-70°C.

[0016] Compared to existing technologies, this invention ensures that the coating is neither too thick nor too thin by controlling the amount of atomized resin per unit time. Excessive flow can lead to uneven coating or excessive accumulation, while insufficient flow can result in inadequate coating. Combined with a short spray height, the shorter distance helps improve the deposition efficiency of atomized particles, ensuring coating uniformity. Furthermore, controlling the speed of the spray gun ensures uniform coating distribution throughout the spraying area; excessive speed leads to uneven coating thickness, while excessively slow speed can result in locally thick coatings. In addition, the invention fully considers the significant impact of temperature on the flowability and curing rate of epoxy resin. At higher temperatures, the resin flows more easily, contributing to a more uniform coating and potentially accelerating the initial curing process. By combining these parameters, the atomization and film-forming processes are precisely controlled, ensuring that the epoxy resin forms a thin yet uniform coating on the inner surface of the perforated pores of the aluminum foam material.

[0017] In some embodiments, the parameters for laser drilling in step S1 are as follows: current of 110-115A, pulse width of 0.4ms, frequency of 130-140Hz, and defocusing amount of -1mm.

[0018] Compared with the prior art, the present invention uses the above-mentioned laser drilling parameters, wherein the selection of current and frequency tends to improve production speed, while the setting of pulse width and defocus amount focuses on controlling the quality of the hole, including the smoothness and perpendicularity of the hole wall. By combining the above parameters, the best drilling effect can be obtained.

[0019] In some embodiments, the through hole is a tapered hole with a taper of 1.15-1.20°.

[0020] Compared with the prior art, the present invention uses a tapered hole with a small taper, mainly because the tapered hole can increase the complexity of the internal structure of the material. When subjected to impact, this structure can provide more paths to disperse and absorb energy. At the same time, the present invention further limits the taper of the through hole, because the taper affects the strength, stiffness and processability of the material, and a smaller taper can distribute the pressure on the contact surface more evenly, avoiding excessive stress concentration, thereby extending the service life of the aluminum foam filled composite material and reducing the risk of fatigue cracks.

[0021] In some embodiments, the through holes are arranged in a square array, and s′, h′, and d′ are obtained by the following calculation formulas:

[0022] s′=s0-△s

[0023] h′=h0+αΔs

[0024] d′=d0+βΔs

[0025] Where s0 is the hole spacing of the standard part of the aluminum foam material;

[0026] h0 represents the thickness of the standard part made of aluminum foam material;

[0027] d0 is the pore size of the standard part of the aluminum foam material;

[0028] s′ is the pore spacing of the through holes in the target aluminum foam-filled composite material;

[0029] h′ is the thickness of the target aluminum foam-filled composite material;

[0030] d′ is the pore diameter of the through hole in the target aluminum foam-filled composite material;

[0031] Δs is the difference between the hole spacing of the standard aluminum foam material and the hole spacing of the through hole of the target aluminum foam filled composite material;

[0032] α is the first preset material coefficient of the target aluminum foam-filled composite material;

[0033] β is the second preset material coefficient of the target aluminum foam-filled composite material.

[0034] Compared with existing technologies, this invention combines the standard aluminum foam material and the design standards (e.g., thickness) to be achieved by the target aluminum foam-filled composite material, along with a first preset material coefficient and a second preset material coefficient, to obtain the target parameters (e.g., hole spacing and pore diameter) of the through holes in the target aluminum foam-filled composite material, thereby optimizing the performance of the target aluminum foam-filled composite material. It is worth noting that s0 represents the hole spacing formed by drilling holes in the standard aluminum foam material, and d0 represents the pore diameter formed by drilling holes in the standard aluminum foam material.

[0035] In some implementations, s0 is 0.2 mm, h0 is 6 cm, and d0 is 0.02 mm.

[0036] This invention defines the parameters of standard parts of aluminum foam material as a benchmark for target aluminum foam-filled composite materials. By adjusting the pore spacing, thickness and pore size, key performance indicators such as sound absorption performance, heat insulation performance, strength and stiffness of the composite material can be optimized.

[0037] In some implementations, α is 10000-11000 and β is 0.1-0.15.

[0038] The preset material coefficients are closely related to the density, expected performance (such as strength, fracture toughness, etc.) of the target aluminum foam-filled composite material, as well as the type and density of the filler material. In this invention, the first preset material coefficient and the second preset material coefficient are limited to the above range. These are the optimal parameters obtained by the inventors after actual experiments, which are beneficial to further improve the composite performance of the target composite material.

[0039] The second objective of this invention is to provide a foamed aluminum filled composite material, which is prepared by the above-described preparation method. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described in detail below. It should be noted that the following embodiments are only used to illustrate the implementation methods and typical parameters of the present invention, and are not intended to limit the parameter range described in the present invention. Reasonable variations derived therefrom are still within the protection scope of the claims of the present invention.

[0041] It should be noted that 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, the endpoint values ​​of the various ranges, the endpoint values ​​of the 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.

[0042] Unless otherwise defined, all terms, symbols, and other scientific terms used herein are intended to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In some instances, terms having a conventional meaning are defined herein for clarification or ease of reference, and such definitions should not be construed as indicating a significant difference from conventional understanding in the art. The technical methods described or referenced herein are generally well understood by those skilled in the art and employed by conventional methods. Unless otherwise stated, the use of commercially available kits, reagents, and instruments shall be performed according to the manufacturer's instructions and parameters.

[0043] The technical effects of the present invention will be described below with reference to specific embodiments.

[0044] Example 1

[0045] This embodiment provides a foamed aluminum filled composite material. The foamed aluminum filled composite material has multiple through holes arranged in a square array. The through holes are filled with polyurethane. The through holes are tapered holes with a taper of 1.15°. The taper is obtained by adjusting the parameters of laser drilling.

[0046] The aluminum foam-filled composite material in this embodiment was prepared by the following method:

[0047] S1. Through holes are obtained in aluminum foam material by laser drilling;

[0048] S2. Use pressure filling method to fill the through hole in step S1 with molten polyurethane;

[0049] S3. Place the aluminum foam material filled with molten polyurethane in a vacuum chamber, heat it while evacuating the vacuum, and slowly release the vacuum and cool it down after the curing reaction to obtain the aluminum foam-filled composite material.

[0050] The standard dimensions of the aluminum foam material are: s0 = 0.2 mm, h0 = 6 cm, and d0 = 0.02 mm.

[0051] In this embodiment, the parameters of the target aluminum foam-filled composite material are as follows: the thickness h′ is 7 cm, α is 10000, β is 0.1, s′ is 0.19 mm, and d′ is 0.021 mm.

[0052] s′=s0-△s

[0053] h′=h0+αΔs

[0054] d′=d0+βΔs

[0055] Where s0 is the hole spacing of the standard part of the aluminum foam material;

[0056] h0 represents the thickness of the standard part made of aluminum foam material;

[0057] d0 is the pore size of the standard part of the aluminum foam material;

[0058] s′ is the pore spacing of the through holes in the target aluminum foam-filled composite material;

[0059] h′ is the thickness of the target aluminum foam-filled composite material;

[0060] d′ is the pore diameter of the through hole in the target aluminum foam-filled composite material;

[0061] △s is the difference between the hole spacing of the standard aluminum foam material and the hole spacing of the through hole of the target aluminum foam filled composite material;

[0062] α is the first preset material coefficient of the target aluminum foam-filled composite material;

[0063] β is the second preset material coefficient of the target aluminum foam-filled composite material.

[0064] Example 2

[0065] This embodiment provides a foamed aluminum filled composite material. The foamed aluminum filled composite material has multiple through holes arranged in a square array. The through holes are filled with rubber. The through holes are tapered holes with a taper of 1.2°. The taper is obtained by adjusting the parameters of laser drilling.

[0066] S1. Through holes are obtained in aluminum foam material by laser drilling;

[0067] S2. Use pressure filling method to fill the through hole in step S1 with molten rubber;

[0068] S3. Place the foamed aluminum material filled with molten rubber in a vacuum chamber, heat it while evacuating the vacuum, and slowly release the vacuum and cool it down after the curing reaction to obtain the foamed aluminum filled composite material.

[0069] The standard dimensions of the aluminum foam material are: s0 = 0.2 mm, h0 = 6 cm, and d0 = 0.02 mm.

[0070] In this embodiment, the parameters of the target aluminum foam-filled composite material are as follows: the known thickness h′ is 6.5 cm, α is 10500, β is 0.12, s′ is 0.15 mm, and d′ is 0.0205 mm.

[0071] s′=s0-△s

[0072] h′=h0+αΔs

[0073] d′=d0+βΔs

[0074] Where s0 is the hole spacing of the standard part of the aluminum foam material;

[0075] h o The thickness of standard parts made of aluminum foam;

[0076] d0 is the pore size of the standard part of the aluminum foam material;

[0077] s′ is the pore spacing of the through holes in the target aluminum foam-filled composite material;

[0078] h′ is the thickness of the target aluminum foam-filled composite material;

[0079] d′ is the pore diameter of the through hole in the target aluminum foam-filled composite material;

[0080] △s is the difference between the hole spacing of the standard aluminum foam material and the hole spacing of the through hole of the target aluminum foam filled composite material;

[0081] α is the first preset material coefficient of the target aluminum foam-filled composite material;

[0082] β is the second preset material coefficient of the target aluminum foam-filled composite material.

[0083] Example 3

[0084] This embodiment provides a foamed aluminum filled composite material. The foamed aluminum filled composite material has multiple through holes arranged in a square array. The through holes are filled with rubber. The through holes are tapered holes with a taper of 1.2°. The taper is obtained by adjusting the stamping and punching parameters.

[0085] S1. Through holes are obtained in aluminum foam material by stamping and punching.

[0086] S2. Use pressure filling method to fill the through hole in step S1 with molten rubber;

[0087] S3. Place the foamed aluminum material filled with molten rubber in a vacuum chamber, heat it while evacuating the vacuum, and slowly release the vacuum and cool it down after the curing reaction to obtain the foamed aluminum filled composite material.

[0088] The standard dimensions of the aluminum foam material are: s0 = 0.2 mm, h0 = 6 cm, and d0 = 0.02 mm.

[0089] In this embodiment, the parameters of the target aluminum foam-filled composite material are as follows: the known thickness h′ is 5.5 cm, α is 10800, β is 0.14, s′ is 0.205 mm, and d′ is 0.019 mm.

[0090] s′=s0-△s

[0091] h′=h0+αΔs

[0092] d′=d0+βΔs

[0093] Where s0 is the hole spacing of the standard part of the aluminum foam material;

[0094] h0 represents the thickness of the standard part made of aluminum foam material;

[0095] d0 is the pore size of the standard part of the aluminum foam material;

[0096] s′ is the pore spacing of the through holes in the target aluminum foam-filled composite material;

[0097] h′ is the thickness of the target aluminum foam-filled composite material;

[0098] d′ is the pore diameter of the through hole in the target aluminum foam-filled composite material;

[0099] △s is the difference between the hole spacing of the standard aluminum foam material and the hole spacing of the through hole of the target aluminum foam filled composite material;

[0100] α is the first preset material coefficient of the target aluminum foam-filled composite material;

[0101] β is the second preset material coefficient of the target aluminum foam-filled composite material.

[0102] Example 4

[0103] This embodiment provides a foamed aluminum filled composite material. The foamed aluminum filled composite material has multiple through holes arranged in a square array. The through holes are filled with polyurethane. The through holes are tapered holes with a taper of 1.15°. The taper is obtained by adjusting the parameters of the stamping and punching.

[0104] The aluminum foam-filled composite material in this embodiment was prepared by the following method:

[0105] S1. Through holes are obtained in aluminum foam material by stamping and punching.

[0106] S2. Use pressure filling method to fill the through hole in step S1 with molten polyurethane;

[0107] S3. Place the aluminum foam material filled with molten polyurethane in a vacuum chamber, heat it while evacuating the vacuum, and slowly release the vacuum and cool it down after the curing reaction to obtain the aluminum foam-filled composite material.

[0108] The standard dimensions of the aluminum foam material are: s0 = 0.2 mm, h0 = 6 cm, and d0 = 0.02 mm.

[0109] In this embodiment, the parameters of the target aluminum foam-filled composite material are as follows: the known thickness h′ is 6.8 cm, α is 11000, β is 0.15, s′ is 0.2 mm, and d′ is 0.02 mm.

[0110] s′=s0-△s

[0111] h′=h0+αΔs

[0112] d′=d0+βΔs

[0113] Where s0 is the hole spacing of the standard part of the aluminum foam material;

[0114] h0 represents the thickness of the standard part made of aluminum foam material;

[0115] d0 is the pore size of the standard part of the aluminum foam material;

[0116] s′ is the pore spacing of the through holes in the target aluminum foam-filled composite material;

[0117] h′ is the thickness of the target aluminum foam-filled composite material;

[0118] h′ is the pore diameter of the through hole in the target aluminum foam-filled composite material;

[0119] △s is the difference between the hole spacing of the standard aluminum foam material and the hole spacing of the through hole of the target aluminum foam filled composite material;

[0120] α is the first preset material coefficient of the target aluminum foam-filled composite material;

[0121] β is the second preset material coefficient of the target aluminum foam-filled composite material.

[0122] Example 5

[0123] This embodiment provides a foamed aluminum filled composite material, which differs from Embodiment 1 only in that the foamed aluminum material in this embodiment undergoes pretreatment. The pretreatment steps are as follows: the visible surface of the foamed aluminum material, except for the inner surface of the through holes, is covered with masking tape; epoxy resin is added to an atomizing spraying device for atomization treatment; and then a film is sprayed onto the inner surface of the through holes. The power of the atomization treatment is 600W, and the parameters for film spraying are as follows: flow rate is 3ml / min, height is 2cm, spraying speed is 15mm / s, and the temperature environment is 60℃.

[0124] Example 6

[0125] This embodiment provides a foamed aluminum filled composite material, which differs from Embodiment 2 only in that the foamed aluminum material in this embodiment undergoes pretreatment. The pretreatment steps are as follows: the visible surface of the foamed aluminum material, except for the inner surface of the through holes, is covered with masking tape; epoxy resin is added to an atomizing spraying device for atomization treatment; and then a film is sprayed onto the inner surface of the through holes. The power of the atomization treatment is 620W, and the parameters for film formation are as follows: flow rate is 3.5ml / min, height is 2.5cm, spraying speed is 16mm / s, and the temperature environment is 62℃.

[0126] Example 7

[0127] This embodiment provides a foamed aluminum filled composite material, which differs from Embodiment 3 only in that the foamed aluminum material in this embodiment undergoes pretreatment. The pretreatment steps are as follows: the visible surface of the foamed aluminum material, except for the inner surface of the through holes, is covered with masking tape; epoxy resin is added to an atomizing spraying device for atomization treatment; and then a film is sprayed onto the inner surface of the through holes. The power of the atomization treatment is 650W, and the parameters for film formation are as follows: flow rate is 4ml / min, height is 2.5cm, spraying speed is 17mm / s, and the temperature environment is 65℃.

[0128] Example 8

[0129] This embodiment provides a foamed aluminum filled composite material, which differs from Embodiment 4 only in that the foamed aluminum material in this embodiment undergoes pretreatment. The pretreatment steps are as follows: the visible surface of the foamed aluminum material, except for the inner surface of the through holes, is covered with masking tape; epoxy resin is added to an atomizing spraying device for atomization treatment; and then a film is sprayed onto the inner surface of the through holes. The power of the atomization treatment is 700W, and the parameters for film spraying are as follows: flow rate is 5ml / min, height is 3cm, spraying speed is 20mm / s, and the temperature environment is 70℃.

[0130] Comparative Example 1

[0131] This comparative example provides a commercially available aluminum foam material.

[0132] Comparative Example 2

[0133] This comparative example provides a foamed aluminum filled composite material, which is prepared using the technical solution of Example 1 of application number CN201910025926.9.

[0134] The composite materials obtained in Examples 1-8 and Comparative Examples 1-2 were subjected to performance testing, and the test results are shown in Table 1.

[0135] Table 1: Performance test results of the composite materials prepared in Examples 1-8 and Comparative Examples 1-2

[0136]

[0137]

[0138] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A method for preparing a foamed aluminum filled composite material, characterized in that, The preparation method specifically includes the following steps: S1. Through holes are obtained in aluminum foam material by laser drilling or punching, wherein the through holes are tapered holes with a taper of 1.15-1.20°. S2. Use pressure filling method to fill the through hole in step S1 with molten polyurethane or molten rubber; S3. Place the foamed aluminum material filled with molten polyurethane or molten rubber in a vacuum chamber, heat up while evacuating the vacuum, and slowly release the vacuum and cool down after the curing reaction to obtain the foamed aluminum filled composite material. In step S1, the aluminum foam material undergoes pretreatment. The pretreatment steps are as follows: covering the visible surface of the aluminum foam material, except for the inner surface of the through holes, with masking tape; adding epoxy resin to the atomizing spraying device for atomization treatment; and then spraying a film onto the inner surface of the through holes. The parameters for the spraying film formation are as follows: flow rate of 3-5 ml / min, height of 2-3 cm, spraying speed of 15-20 mm / s, and temperature environment of 60-70℃.

2. The method for preparing the aluminum foam-filled composite material as described in claim 1, characterized in that, The power of the atomization process is 600-700W.

3. The method for preparing the aluminum foam-filled composite material as described in claim 1, characterized in that, In step S1, the parameters for laser drilling are as follows: current of 110-115 A, pulse width of 0.4 ms, frequency of 130-140 Hz, and defocusing amount of -1 mm.

4. The method for preparing the aluminum foam-filled composite material as described in claim 1, characterized in that, The through holes are arranged in a square array and are obtained by the following calculation formula. , ,and : ， ， ， in, The hole spacing of standard parts made of aluminum foam material; The thickness of standard parts made of aluminum foam; The aperture size of standard parts made of aluminum foam material; The pore spacing of the through holes in the target aluminum foam-filled composite material; The thickness of the target aluminum foam-filled composite material; The pore size of the through holes in the target aluminum foam-filled composite material; The difference between the hole spacing of the standard aluminum foam material and the hole spacing of the through holes of the target aluminum foam-filled composite material; The first preset material coefficient for the target aluminum foam-filled composite material; The second preset material coefficient for the target aluminum foam-filled composite material.

5. The method for preparing the aluminum foam-filled composite material as described in claim 4, characterized in that, The It is 0.2mm, the It is 6cm, the aforementioned It is 0.02mm.

6. The method for preparing the aluminum foam-filled composite material as described in claim 4, characterized in that, The The value is 10000-11000. It ranges from 0.1 to 0.

15.

7. A foamed aluminum filled composite material, characterized in that, It is prepared by any one of the preparation methods described in claims 1-6.

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