Fiber-reinforced aluminum-based composite material and preparation method thereof

Abstract

The invention discloses a fiber-reinforced aluminum-based composite material and a preparation method thereof, and belongs to the technical field of metal composite materials. A preparation method of a fiber reinforced aluminum-based composite material comprises the following steps that Cu-MOF-NH2 (at) BF and epoxy modified aluminum powder are stirred for 12-20 min, then ball milling is conducted, and mixed powder is obtained; and sintering the mixed powder, and cooling to obtain the fiber-reinforced aluminum-based composite material. According to the preparation method disclosed by the invention, uniform mixing of Cu-MOF-NH2-coated BF and epoxy modified aluminum powder is quickly realized through stirring and ball milling. Interface contact is strengthened by mechanical force of a ball mill, the MOF surface amino group and the aluminum powder epoxy group are subjected to a bonding reaction, and subsequent sintering further consolidates combination. According to the process, the premixing period is greatly shortened, the fiber-aluminum-based interface strength and the heat conduction network construction efficiency are synchronously improved, and the mechanical property and the heat conduction efficiency of the composite material are remarkably optimized.

Description

Technical Field

[0001] This invention relates to the field of metal composite materials, and in particular to a fiber-reinforced aluminum matrix composite material and its preparation method. Background Technology

[0002] Aluminum-based composite materials are widely used in various industries due to their light weight, good ductility, and thermal conductivity, making them one of the most important lightweight metal composite materials today. With the rapid development of industries such as transportation, electronics manufacturing, and building decoration, the demand for aluminum-based composite materials with higher mechanical and thermal conductivity is increasing. Therefore, the research and development of new high-performance aluminum-based composite materials is urgently needed.

[0003] Patent CN113430471B discloses a method for preparing basalt fiber reinforced aluminum matrix composites and the resulting product. Using basalt fiber (BF) as the reinforcing material and Al powder as the matrix material, the composite material is prepared by ball milling and spark plasma sintering. This composite material has a simple preparation process, low cost, and is energy-saving and environmentally friendly, showing potential application value in transportation, electronics manufacturing, and building decoration. However, the poor compatibility between basalt fiber and Al powder can affect the overall performance of the composite material. Summary of the Invention

[0004] This invention provides a fiber-reinforced aluminum matrix composite material and its preparation method, which can solve the problem in the prior art that the poor compatibility between basalt fiber and Al powder affects the overall performance of the composite material.

[0005] The objective of this invention can be achieved through the following technical solutions: In a first aspect, the present invention provides a method for preparing fiber-reinforced aluminum matrix composite materials, comprising the following steps: Cu-MOF-NH2@BF was stirred with epoxy-modified aluminum powder for 12-20 minutes, and then ball-milled to obtain a mixed powder. The mixed powder was sintered and cooled to obtain a fiber-reinforced aluminum matrix composite material.

[0006] Furthermore, the mass ratio of Cu-MOF-NH2@BF to epoxy-modified aluminum powder is (0.1-0.3):50.

[0007] Furthermore, the specific parameters of the ball mill are: ball-to-material ratio (3-5):1, ball milling time of 3-4 hours, and ball milling speed of 200-400 r / min.

[0008] Furthermore, the specific sintering conditions are as follows: in a vacuum environment, the temperature is 500-650℃, the heating rate is 100-150℃ / min, the holding time is 5-10min, and an axial pressure of 30-40MPa is applied during sintering.

[0009] Furthermore, the cooling is performed under vacuum conditions for 2-3 hours.

[0010] Furthermore, the preparation method of Cu-MOF-NH2@BF is as follows: Cu(NO3)2·3H2O was dissolved in methanol, and then BF was added. The mixture was soaked at room temperature for 10-14 h to obtain a solution containing BF. 2-Aminobenzimidazole was dissolved in methanol to obtain solution A. Solution A was added to the solution containing BF, stirred for 1-2 h, allowed to stand for 24 h, and then dried to obtain Cu-MOF-NH2@BF.

[0011] Furthermore, the ratio of Cu(NO3)2·3H2O, methanol, and BF is 0.14g:50mL:0.5g; the ratio of 2-aminobenzimidazole to methanol is 0.13-0.26g:50mL; and the ratio of the BF-containing solution to solution A is 1:1.

[0012] Furthermore, the preparation method of the epoxy-modified aluminum powder is as follows:

[0013] An epoxy-containing silane coupling agent was added to an ethanol aqueous solution, followed by aluminum powder. The mixture was stirred for 3-5 hours, then filtered, washed, and dried to obtain epoxy-modified aluminum powder.

[0014] Furthermore, the ratio of the epoxy-containing silane coupling agent, the ethanol aqueous solution, and the aluminum powder is 0.04-0.08g:40mL:2g; the volume ratio of anhydrous ethanol to deionized water in the ethanol aqueous solution is 9:1.

[0015] Further, the epoxy-containing silane coupling agent is any one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, trimethoxy[2-(7-oxabicyclo[4.1.0]hept-3-yl)ethyl]silane, and 3-glycidyl etheroxypropyltriethoxysilane.

[0016] Secondly, the present invention provides a fiber-reinforced aluminum matrix composite material, which is prepared by any one of the preparation methods described above.

[0017] The beneficial effects of this invention are: 1. This invention achieves rapid and uniform mixing of Cu-MOF-NH2@BF and epoxy-modified aluminum powder through 12-20 minutes of stirring followed by ball milling. This process strengthens the interfacial contact between the fiber and aluminum powder through the mechanical force of ball milling, and utilizes the bonding reaction between the amino groups on the MOF surface and the epoxy groups on the aluminum powder surface. Subsequent sintering further consolidates the interfacial bonding. The resulting fiber-reinforced aluminum matrix composite material simultaneously achieves improved fiber-aluminum matrix interfacial strength and thermally conductive network construction within a very short premixing time. Compared with traditional processes, this method shortens the premixing cycle and significantly optimizes the mechanical properties and thermal conductivity of the material.

[0018] 2. This invention prepared Cu-MOF-NH2@BF. After modification with Cu-MOF-NH2, BF can simultaneously achieve multiple advantages in a short time: On the one hand, the porous structure and coordination sites (amino groups) of Cu-MOF-NH2 can enhance the anchoring effect on the fiber surface, which can significantly improve the interfacial bonding strength between the fiber and the aluminum matrix, solving the problem of poor compatibility between traditional basalt fibers and aluminum matrices; on the other hand, the copper-based component in Cu-MOF-NH2 forms metallic copper after sintering. Copper has good thermal conductivity, which can improve the overall thermal conductivity of the composite material. Moreover, the modification process does not require complex post-treatment. Compared with unmodified BF, it not only shortens the interface optimization cycle of composite material preparation, but also significantly improves the mechanical stability and thermal conductivity of the final material.

[0019] 3. This invention modifies aluminum powder with an epoxy-containing silane coupling agent, which can improve the dispersibility of aluminum powder and enhance its compatibility with Cu-MOF-NH2@BF, thereby improving the mechanical properties and thermal conductivity of the composite material. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below.

[0021] In a first aspect, the present invention provides a method for preparing fiber-reinforced aluminum matrix composite materials, comprising the following steps: Cu-MOF-NH2@BF and epoxy-modified aluminum powder are stirred for 12-20 minutes, followed by ball milling to obtain a mixed powder. The mixed powder is then sintered and cooled to obtain a fiber-reinforced aluminum matrix composite material. This invention achieves rapid and uniform mixing of Cu-MOF-NH2@BF and epoxy-modified aluminum powder through a 12-20 minute stirring and ball milling process. The ball milling enhances the interfacial contact between the fiber and aluminum powder through mechanical force, while the bonding reaction between the amino groups on the MOF surface and the epoxy groups on the aluminum powder surface is utilized. Subsequent sintering further strengthens the interfacial bond. The resulting fiber-reinforced aluminum matrix composite material simultaneously improves the fiber-aluminum matrix interfacial strength and constructs a thermally conductive network within a very short premixing time. Compared to traditional processes, this shortens the premixing cycle and significantly optimizes the mechanical properties and thermal conductivity of the material, making it suitable for lightweight, high-stability structural components and heat dissipation parts.

[0022] In some embodiments, the mass ratio of Cu-MOF-NH2@BF to epoxy-modified aluminum powder is (0.1-0.3):50. At this mass ratio, the amount of Cu-MOF-NH2@BF precisely achieves the dual effects of "interface modification + enhanced thermal conductivity," while avoiding performance imbalance caused by excessive fiber. A small amount of Cu-MOF-NH2@BF can form stable chemical bonds with the epoxy groups of the epoxy-modified aluminum powder through surface amino groups, filling the voids at the aluminum matrix interface and constructing a nano-Cu thermally conductive network, significantly improving the Vickers hardness and thermal conductivity of the composite material. Simultaneously, the low proportion design maximizes the preservation of the lightweight characteristics of the aluminum matrix, avoiding interface defects caused by fiber agglomeration, ultimately achieving synergistic optimization of the composite material's "mechanical stability, efficient thermal conductivity, and lightweight," adapting to the application requirements of structural components and heat dissipation parts.

[0023] In some embodiments, the specific parameters of the ball milling are: ball-to-material ratio (3-5):1, milling time of 3-4 hours, and milling speed of 200-400 r / min. This method can achieve uniform mixing of Cu-MOF-NH2@BF and epoxy-modified aluminum powder through appropriate mechanical force, avoiding uneven mixing caused by low parameters, and preventing fiber breakage or excessive oxidation of aluminum powder caused by high parameters, thus ensuring the structural integrity of the mixed powder and its compatibility with subsequent sintering.

[0024] In some embodiments, the specific sintering conditions are: under vacuum, at a temperature of 500-650℃, a heating rate of 100-150℃ / min, a holding time of 5-10min, and an axial pressure of 30-40MPa applied during sintering. This ensures sufficient densification of the aluminum matrix and efficient conversion of Cu-MOF-NH2 into a nano-Cu thermally conductive phase, while avoiding fiber ablation or excessive interfacial reaction caused by high-temperature, long-term sintering, thus balancing the mechanical properties and thermal conductivity of the composite material.

[0025] In some embodiments, the cooling is performed under vacuum conditions for 2-3 hours. This slows down the cooling rate to reduce thermal stress inside the composite material, avoids microcracks or structural defects caused by rapid cooling, and the vacuum environment prevents oxidation of the material surface during cooling, ensuring the structural stability and surface quality of the composite material.

[0026] In some embodiments, the preparation method of Cu-MOF-NH2@BF is as follows: Cu(NO3)2·3H2O was dissolved in methanol, and then BF was added. The mixture was soaked at room temperature for 10-14 h to obtain a solution containing BF. 2-Aminobenzimidazole was dissolved in methanol to obtain solution A. Solution A was added to the solution containing BF, stirred for 1-2 h, allowed to stand for 24 h, and then dried to obtain Cu-MOF-NH2@BF.

[0027] In the above steps, the abundant hydroxyl groups on the BF surface first interact electrostatically with copper ions. After introducing 2-aminobenzimidazole, a stable Cu-MOF-NH2 is formed by coordinating the imidazole ligand with the copper ions anchored on the fiber surface, thus obtaining Cu-MOF-NH2@BF.

[0028] In some embodiments, the ratio of Cu(NO3)2·3H2O, methanol, and BF is 0.14 g: 50 mL: 0.5 g; the ratio of 2-aminobenzimidazole to methanol is 0.13-0.26 g: 50 mL; and the ratio of the BF-containing solution to solution A is 1:1. This ratio ensures efficient interaction between Cu(NO3)2·3H2O and 2-aminobenzimidazole and the hydroxyl groups on the BF surface in the methanol system, achieving uniform in-situ growth of Cu-MOF-NH2 on the BF surface and avoiding MOF aggregation caused by excessive ligands or copper salts. Furthermore, the 1:1 solution volume ratio ensures sufficient reaction and system stability, ultimately yielding Cu-MOF-NH2@BF with strong interfacial bonding and excellent functional properties, laying the foundation for subsequent optimization of the mechanical and thermal conductivity properties of the composite material.

[0029] In some embodiments, the preparation method of the epoxy-modified aluminum powder is as follows:

[0030] An epoxy-containing silane coupling agent was added to an ethanol aqueous solution, followed by aluminum powder. The mixture was stirred for 3-5 hours, then filtered, washed, and dried to obtain epoxy-modified aluminum powder.

[0031] By providing a suitable hydrolytic environment for the silane coupling agent with an ethanol-water solution, silanol groups are generated and firmly anchored on the surface of aluminum powder, successfully introducing epoxy active groups onto the aluminum powder surface. At the same time, the stirring process promotes uniform coverage of the coupling agent and avoids agglomeration. The epoxy-modified aluminum powder obtained after washing and drying not only improves the interfacial compatibility between aluminum powder and subsequent Cu-MOF-NH2@BF, but also strengthens the interfacial bonding between aluminum matrix and fiber through the covalent bonding of epoxy groups and amino groups on the MOF surface, laying a solid foundation for improving the mechanical properties and thermal conductivity of the final composite material.

[0032] In some embodiments, the ratio of the epoxy-containing silane coupling agent, the ethanol aqueous solution, and the aluminum powder is 0.04-0.08 g: 40 mL: 2 g; the volume ratio of anhydrous ethanol to deionized water in the ethanol aqueous solution is 9:1. This method ensures proper hydrolysis of the coupling agent and uniform coverage of the aluminum powder surface through precise dosage control, avoiding insufficient modification due to insufficient dosage or agglomeration caused by excessive dosage. Furthermore, the 9:1 alcohol-to-water ratio balances hydrolysis efficiency and system stability, guaranteeing effective grafting of epoxy groups onto the aluminum powder surface.

[0033] In some embodiments, the epoxy-containing silane coupling agent is any one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, trimethoxy[2-(7-oxabicyclo[4.1.0]hept-3-yl)ethyl]silane, and 3-glycidyl etheroxypropyltriethoxysilane. All of these agents can efficiently introduce epoxy active groups onto the surface of aluminum powder. Furthermore, these coupling agents exhibit strong reactivity with the hydroxyl groups on the aluminum powder surface and stable interfacial bonding, making them suitable for subsequent amino bonding with Cu-MOF-NH2@BF and providing a reliable chemical basis for composite material interface optimization.

[0034] Secondly, the present invention provides a fiber-reinforced aluminum matrix composite material, which is prepared by any one of the preparation methods described above.

[0035] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0036] Preparation Example 1

[0037] The preparation method of Cu-MOF-NH2@BF in this preparation example is as follows: Dissolve 0.14 g Cu(NO3)2·3H2O in 50 mL of methanol, then add 0.5 g BF, and soak at room temperature for 10 h to obtain a solution containing BF; dissolve 0.13 g 2-aminobenzimidazole in 50 mL of methanol to obtain solution A; add 50 mL of solution A to 50 mL of solution containing BF, stir for 1 h, let stand for 24 h, and then dry to obtain Cu-MOF-NH2@BF.

[0038] Preparation Example 2

[0039] The preparation method of Cu-MOF-NH2@BF in this preparation example is as follows: Dissolve 0.14 g Cu(NO3)2·3H2O in 50 mL of methanol, then add 0.5 g BF, and soak at room temperature for 12 h to obtain a solution containing BF; dissolve 0.20 g 2-aminobenzimidazole in 50 mL of methanol to obtain solution A; add 50 mL of solution A to 50 mL of solution containing BF, stir for 1.5 h, let stand for 24 h, and then dry to obtain Cu-MOF-NH2@BF.

[0040] Preparation Example 3

[0041] The preparation method of Cu-MOF-NH2@BF in this preparation example is as follows: Dissolve 0.14 g Cu(NO3)2·3H2O in 50 mL of methanol, then add 0.5 g BF, and soak at room temperature for 14 h to obtain a solution containing BF; dissolve 0.26 g 2-aminobenzimidazole in 50 mL of methanol to obtain solution A; add 50 mL of solution A to 50 mL of solution containing BF, stir for 2 h, let stand for 24 h, and then dry to obtain Cu-MOF-NH2@BF.

[0042] Compare with Example 1

[0043] The preparation method of Cu-MOF@BF in this comparative example is as follows: Dissolve 0.14 g Cu(NO3)2·3H2O in 50 mL of methanol, then add 0.5 g BF, and soak at room temperature for 10 h to obtain a solution containing BF; dissolve 0.13 g benzimidazole in 50 mL of methanol to obtain solution A; add 50 mL of solution A to 50 mL of solution containing BF, stir for 1 h, let stand for 24 h, and then dry to obtain Cu-MOF@BF.

[0044] Preparation Example 4

[0045] The preparation method of epoxy-modified aluminum powder in this preparation example is as follows:

[0046] 0.04 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane was added to 40 mL of an ethanol aqueous solution with a volume ratio of anhydrous ethanol to deionized water of 9:1. Then 2 g of aluminum powder was added, and the mixture was stirred for 3 h. After filtration, washing, and drying, epoxy-modified aluminum powder was obtained.

[0047] Preparation Example 5

[0048] The preparation method of epoxy-modified aluminum powder in this preparation example is as follows:

[0049] 0.06 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane was added to 40 mL of an ethanol aqueous solution with a volume ratio of anhydrous ethanol to deionized water of 9:1. Then 2 g of aluminum powder was added and stirred for 4 h. After filtration, washing and drying, epoxy-modified aluminum powder was obtained.

[0050] Preparation Example 6

[0051] The preparation method of epoxy-modified aluminum powder in this preparation example is as follows:

[0052] 0.08 g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane was added to 40 mL of an ethanol aqueous solution with a volume ratio of anhydrous ethanol to deionized water of 9:1. Then 2 g of aluminum powder was added and stirred for 5 h. After filtration, washing and drying, epoxy-modified aluminum powder was obtained.

[0053] Example 1

[0054] This embodiment provides a method for preparing fiber-reinforced aluminum matrix composites, including the following steps: 0.1g of Cu-MOF-NH2@BF obtained in Preparation Example 1 was mixed with 50g of epoxy-modified aluminum powder obtained in Preparation Example 4 and stirred for 12 min. Then, the mixture was ball-milled at a ball-to-material ratio of 3:1 for 3 h at a speed of 200 r / min to obtain a mixed powder. The mixed powder was then loaded into a matching graphite mold of a benchtop electric discharge plasma sintering furnace and sintered under the following conditions: 500℃ in a vacuum environment, a heating rate of 100℃ / min, a holding time of 5 min, and an axial pressure of 30 MPa applied during sintering. After cooling under vacuum for 2 h, a fiber-reinforced aluminum matrix composite material was obtained.

[0055] Example 2

[0056] This embodiment provides a method for preparing fiber-reinforced aluminum matrix composites, including the following steps: 0.15g of Cu-MOF-NH2@BF obtained in Preparation Example 1 was mixed and stirred with 50g of epoxy-modified aluminum powder obtained in Preparation Example 4 for 16 min, followed by ball milling at a ball-to-powder ratio of 4:1 for 3.5 h at a speed of 300 r / min to obtain a mixed powder. The mixed powder was then loaded into a matching graphite mold of a benchtop electric discharge plasma sintering furnace and sintered under the following conditions: 600℃ in a vacuum environment, a heating rate of 120℃ / min, a holding time of 8 min, and an axial pressure of 35 MPa applied during sintering. After cooling under vacuum for 2.5 h, fiber-reinforced aluminum matrix composite material was obtained.

[0057] Example 3

[0058] This embodiment provides a method for preparing fiber-reinforced aluminum matrix composites, including the following steps: 0.2g of Cu-MOF-NH2@BF obtained in Preparation Example 2 was mixed and stirred with 50g of epoxy-modified aluminum powder obtained in Preparation Example 5 for 16 min, followed by ball milling at a ball-to-powder ratio of 4:1 for 3.5 h at a speed of 300 r / min to obtain a mixed powder. The mixed powder was then loaded into a matching graphite mold of a benchtop electric discharge plasma sintering furnace and sintered under the following conditions: 600℃ in a vacuum environment, a heating rate of 120℃ / min, a holding time of 8 min, and an axial pressure of 35 MPa applied during sintering. After cooling under vacuum for 2.5 h, fiber-reinforced aluminum matrix composite material was obtained.

[0059] Example 4

[0060] This embodiment provides a method for preparing fiber-reinforced aluminum matrix composites, including the following steps: 0.25g of Cu-MOF-NH2@BF obtained in Preparation Example 3 was mixed and stirred with 50g of epoxy-modified aluminum powder obtained in Preparation Example 6 for 16 min, followed by ball milling at a ball-to-powder ratio of 4:1 for 3.5 h at a speed of 300 r / min to obtain a mixed powder. The mixed powder was then loaded into a matching graphite mold of a benchtop electric discharge plasma sintering furnace and sintered under the following conditions: 600℃ in a vacuum environment, a heating rate of 120℃ / min, a holding time of 8 min, and an axial pressure of 35 MPa applied during sintering. After cooling under vacuum for 2.5 h, a fiber-reinforced aluminum matrix composite material was obtained.

[0061] Example 5

[0062] This embodiment provides a method for preparing fiber-reinforced aluminum matrix composites, including the following steps: 0.3g of Cu-MOF-NH2@BF obtained in Preparation Example 3 was mixed and stirred with 50g of epoxy-modified aluminum powder obtained in Preparation Example 6 for 20 min, followed by ball milling at a ball-to-material ratio of 5:1 for 4 h at a speed of 400 r / min to obtain a mixed powder. The mixed powder was then loaded into a matching graphite mold of a benchtop electric discharge plasma sintering furnace and sintered under the following conditions: 650℃ in a vacuum environment, a heating rate of 150℃ / min, a holding time of 10 min, and an axial pressure of 40 MPa applied during sintering. After cooling under vacuum for 3 h, fiber-reinforced aluminum matrix composite material was obtained.

[0063] Comparative Example 1

[0064] The only difference between this comparative example and Example 1 is that the Cu-MOF-NH2@BF obtained in Preparation Example 1 was replaced with an equal amount of Cu-MOF@BF obtained in Control Example 1.

[0065] Comparative Example 2

[0066] The only difference between this comparative example and Example 1 is that the Cu-MOF-NH2@BF obtained in Preparation Example 1 was replaced with an equal amount of BF.

[0067] Comparative Example 3

[0068] The only difference between this comparative example and Example 1 is that the epoxy-modified aluminum powder obtained in Preparation Example 4 was replaced with an equal amount of aluminum powder.

[0069] Comparative Example 4

[0070] The only difference between this comparative example and Example 1 is that the Cu-MOF-NH2@BF obtained in Preparation Example 1 was replaced with an equal amount of BF, and the epoxy-modified aluminum powder obtained in Preparation Example 4 was replaced with an equal amount of aluminum powder.

[0071] The composite materials obtained in Examples 1-5 and Comparative Examples 1-4 were tested, and the test results are shown in Table 1: Table 1

[0072] As can be seen from Table 1, the thermal conductivity and hardness of the composite materials obtained in Examples 1-5 are better than those in Comparative Examples 1-4.

[0073] Compared with Example 1, Comparative Example 1 shows that amino groups can bond with the epoxy groups on the surface of aluminum powder, thereby improving the overall mechanical properties and thermal conductivity of the material.

[0074] Compared with Example 1, Comparative Example 2 shows that the copper-based component in Cu-MOF-NH2 forms metallic copper after sintering. Copper has good thermal conductivity, which can improve the overall thermal conductivity of the composite material.

[0075] Compared with Example 1, Comparative Example 3 shows that aluminum powder modified with epoxy-containing silane coupling agent can improve the dispersibility of aluminum powder and enhance its compatibility with Cu-MOF-NH2@BF, thereby improving the mechanical properties and thermal conductivity of the composite material.

[0076] In Comparative Example 4, neither BF nor aluminum powder was modified, so its performance was the worst.

[0077] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A method for preparing a fiber-reinforced aluminum matrix composite material, characterized in that, Includes the following steps: Cu-MOF-NH2@BF was stirred with epoxy-modified aluminum powder for 12-20 minutes, and then ball-milled to obtain a mixed powder. The mixed powder was sintered and cooled to obtain a fiber-reinforced aluminum matrix composite material.

2. The method for preparing fiber-reinforced aluminum matrix composite material according to claim 1, characterized in that, The mass ratio of Cu-MOF-NH2@BF to epoxy-modified aluminum powder is (0.1-0.3):

50.

3. The method for preparing fiber-reinforced aluminum matrix composite material according to claim 1, characterized in that, The specific parameters for ball milling are: ball-to-material ratio (3-5):1, milling time of 3-4 hours, and milling speed of 200-400 r / min.

4. The method for preparing fiber-reinforced aluminum matrix composite material according to claim 1, characterized in that, The specific sintering conditions are as follows: under vacuum, the temperature is 500-650℃, the heating rate is 100-150℃ / min, the holding time is 5-10min, and an axial pressure of 30-40MPa is applied during sintering.

5. The method for preparing fiber-reinforced aluminum matrix composite material according to claim 1, characterized in that, The cooling process involves cooling under vacuum conditions for 2-3 hours.

6. The method for preparing fiber-reinforced aluminum matrix composite material according to claim 1, characterized in that, The preparation method of Cu-MOF-NH2@BF is as follows: Cu(NO3)2·3H2O was dissolved in methanol, and then BF was added. The mixture was soaked at room temperature for 10-14 h to obtain a solution containing BF. 2-Aminobenzimidazole was dissolved in methanol to obtain solution A. Solution A was added to the solution containing BF, stirred for 1-2 h, allowed to stand for 24 h, and then dried to obtain Cu-MOF-NH2@BF.

7. The method for preparing fiber-reinforced aluminum matrix composite material according to claim 6, characterized in that, The ratio of Cu(NO3)2·3H2O, methanol, and BF is 0.14g:50mL:0.5g; the ratio of 2-aminobenzimidazole to methanol is 0.13-0.26g:50mL; and the ratio of the BF-containing solution to solution A is 1:

1.

8. The method for preparing fiber-reinforced aluminum matrix composite material according to claim 1, characterized in that, The preparation method of the epoxy-modified aluminum powder is as follows: An epoxy-containing silane coupling agent was added to an ethanol aqueous solution, followed by aluminum powder. The mixture was stirred for 3-5 hours, then filtered, washed, and dried to obtain epoxy-modified aluminum powder.

9. The method for preparing fiber-reinforced aluminum matrix composite material according to claim 8, characterized in that, The ratio of the epoxy-containing silane coupling agent, the ethanol aqueous solution, and the aluminum powder is 0.04-0.08 g: 40 mL: 2 g; the volume ratio of anhydrous ethanol to deionized water in the ethanol aqueous solution is 9:

1. The epoxy-containing silane coupling agent is any one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, trimethoxy[2-(7-oxabicyclo[4.1.0]hept-3-yl)ethyl]silane, and 3-glycidyl etheroxypropyltriethoxysilane.

10. A fiber-reinforced aluminum matrix composite material, characterized in that, It is prepared by the preparation method according to any one of claims 1-9.

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