A high-modulus aluminum matrix silicon carbide foil and its preparation process

Abstract

The present invention relates to the technical field of aluminum matrix silicon carbide foil materials, and specifically to a high-modulus aluminum matrix silicon carbide foil material and its preparation process: S1: Base material preparation, the base material includes slurry and fiber material; the mass ratio of the slurry to the fiber material is 10: (0.2 - 0.4); the raw materials of the slurry include aluminum, silicon carbide, and molybdenum, wherein the mass ratio of aluminum, silicon carbide, and molybdenum is 1: (0.1 - 0.2): (0.02 - 0.04). In the present invention, N,N-dimethylformamide can delay the solvent evaporation rate, and polyvinylpyrrolidone can improve the fiber morphology and avoid the generation of bead-like structures. Finally, the fiber material is obtained through electrospinning treatment. During the electrospinning treatment process, the fiber material can form a nano-scale fiber structure, greatly increasing the specific surface area, which is beneficial to playing a role in enhancing the bonding effect in the foil material, thereby effectively improving the strength and ductility of the foil material.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum matrix silicon carbide foils, and specifically to a high-modulus aluminum matrix silicon carbide foil and a preparation process thereof. Background Art

[0002] Aluminum matrix silicon carbide foil is a new type of composite material with aluminum as the matrix and silicon carbide as the reinforcing phase. It combines the high electrical conductivity, thermal conductivity and good processing performance of aluminum, as well as the high hardness, high strength and high wear resistance of silicon carbide, and has broad application prospects in the fields of aerospace, electronic packaging, etc.

[0003] In the prior art, during the preparation of aluminum matrix silicon carbide foil, the natural wettability between silicon carbide and aluminum is poor, which makes it difficult for aluminum liquid to fully wrap silicon carbide particles during the preparation process, resulting in a poor bonding effect and easily affecting the strength performance of the foil. Based on this, the present invention provides a high-modulus aluminum matrix silicon carbide foil and a preparation process thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-modulus aluminum matrix silicon carbide foil and a preparation process thereof. The aluminum matrix silicon carbide foil prepared by the present invention not only has good strength performance, but also has excellent elongation performance, effectively improving the service performance of the high-modulus aluminum matrix silicon carbide foil.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] In the first aspect, the present invention provides a preparation process of a high-modulus aluminum matrix silicon carbide foil, including the following steps:

[0007] S1: Base material preparation, the base material includes slurry and fiber material;

[0008] The mass ratio of the slurry to the fiber material is 10:(0.2 - 0.4);

[0009] The raw materials of the slurry include aluminum, silicon carbide, and molybdenum. Among them, the mass ratio of aluminum, silicon carbide, and molybdenum is 1:(0.1 - 0.2):(0.02 - 0.04);

[0010] The raw materials of the fiber material include clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone. Before the preparation of the fiber material, the clay is pretreated to obtain a mixed material. Among them, the mass ratio of clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone is 10:(1 - 3):(0.4 - 0.6):(0.2 - 0.4):(0.1 - 0.3);

[0011] S2: Substrate preparation, after the slurry and the fiber material are mixed and prepared, they are sintered to obtain a substrate;

[0012] S3: Forming treatment. After the base material undergoes forming treatment, a high-modulus aluminum-based silicon carbide foil is obtained.

[0013] Furthermore, the clay selected is kaolin with a particle size of 20 - 60 nm.

[0014] Furthermore, the pretreatment method of the clay is as follows: The clay and acetone are added into a mixer, deionized water is added to the mixer, the mixer is set to stir at 800 - 1000 r / min for 6 - 10 h, after completion of stirring, it is left to stand and react for 20 - 30 h, and the obtained product is defoamed to obtain a mixture.

[0015] Furthermore, the mass of acetone is 5 - 7% of the mass of the clay, and the mass of deionized water is 40 - 60 times the mass of the clay.

[0016] Furthermore, the fiber material is prepared by the following method: Polylactic acid and N,N-dimethylformamide are added into a reaction kettle, the reaction kettle is set to heat up to 65 - 75 °C, the stirring speed is set to 120 - 160 r / min, and it is set to keep warm and stir for 10 - 20 min. After cooling to room temperature, the mixture, chloroform, and polyvinylpyrrolidone are added, and it is set to stir at 400 - 600 r / min for 20 - 30 min. The obtained product is sent into an ultrasonic disperser, set to 100 - 200 W, and dispersed for 6 - 10 min to obtain a mixed solution. The mixed solution is subjected to electrospinning treatment to obtain the fiber material.

[0017] Furthermore, the electrospinning treatment method is as follows: The mixed solution is added into an electrospinning device, the injection speed is set to 0.4 - 0.6 ml / h, the voltage is 15 - 20 kV, and the receiving distance is 10 - 20 cm. The obtained product is cut and crushed to obtain the fiber material.

[0018] Furthermore, the method for preparing the base material is as follows: The slurry and the fiber material are added into a mixer, the mixer is set to stir at 800 - 1200 r / min for 40 - 50 min, then a treating agent is added and stirring is continued for 6 - 10 min. The obtained product and water are added into a ball mill for wet ball milling treatment for 4 - 6 h. After the obtained product is defoamed, a casting treatment is carried out to obtain a cast film. The cast film is subjected to dewaxing and sintering treatments to obtain the base material. Among them, the mass of the treating agent is 0.8 - 1.2% of the mass of the slurry, the mass of water is 40 - 50% of the mass of the slurry, the dewaxing temperature is 300 - 400 °C, and the sintering temperature is 800 - 1200 °C.

[0019] Further, the treatment agent is a mixture of polyacrylic acid, silane coupling agent - KH550, and glycerol, and the mass ratio of polyacrylic acid, silane coupling agent - KH550, and glycerol is 1:(0.1 - 0.2):(0.2 - 0.3).

[0020] Further, the method of the forming treatment is as follows: the substrate is subjected to preliminary pressing treatment, and the pressing thickness is 1 - 5 mm. Then, leveling and surface grinding and polishing treatments are carried out. The substrate that has completed the above treatments is cut into a suitable size and subjected to heat treatment. The heating temperature is 420 - 520 °C, and the heat preservation time is 10 - 30 min. After the heat treatment is completed, rolling treatment is carried out. The thickness of the rolled substrate is 0.8 - 1.5 mm. Then, the temperature is set at 430 - 500 °C, and the heat preservation time is 1 - 3 h for annealing treatment. After the annealing treatment is completed, the substrate is rolled again, and the thickness is 0.1 - 0.2 mm. After rolling is completed, cleaning, drying, and surface grinding and polishing treatments are carried out. Then, surface etching treatment is carried out according to requirements to obtain a high - modulus aluminum - based silicon carbide foil.

[0021] In the second aspect, the present invention also provides a high - modulus aluminum - based silicon carbide foil, which is prepared by the preparation process of the high - modulus aluminum - based silicon carbide foil.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. In the present invention, during the preparation of the foil, the slurry and the fiber material are pre - mixed. Among them, the electrospun fibers are prepared through the modification system of clay in the fiber material. The fiber network formed by the compound of clay and polylactic acid is embedded in the aluminum matrix. The external load is transferred from the matrix to the high - strength fibers through the interfacial shear stress, effectively dispersing the stress concentration. Chloroform is used as a solvent to adjust the viscosity of polylactic acid. N,N - dimethylformamide can delay the solvent evaporation rate. Polyvinylpyrrolidone can improve the fiber morphology and avoid the generation of beaded structures. Finally, the fiber material is obtained through electrospinning treatment. During the electrospinning treatment, the fiber material can form a nano - scale fiber structure, greatly increasing the specific surface area, which is beneficial to playing a role in enhancing the bonding effect in the foil, thereby effectively improving the strength and ductility of the foil.

[0024] 2. In the present invention, during the preparation process of the base material, a treating agent is added. Polyacrylic acid, as an anionic dispersant, has its carboxyl groups adsorbed on the surfaces of silicon carbide and molybdenum particles through electrostatic repulsion to form a double-layer structure, effectively preventing particle agglomeration. The amino group of KH-550 reacts with the hydroxyl groups on the surface of the aluminum matrix to form chemical bonding, which can effectively enhance the interfacial bonding strength between the base material and the fiber material, inhibit the deformation generated when the material is stressed. The addition of glycerol can improve the fluidity of the slurry, promote the dispersion of the treating agent and the fiber material in the slurry, and further enhance the bonding strength between the fiber material and the base material, thereby improving the strength performance of the foil material. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a flow chart of a high-modulus aluminum matrix silicon carbide foil material and its preparation process proposed by the invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Among them, it should be noted that the raw materials used in the following embodiments are all commercially available raw materials.

[0028] Embodiment 1

[0029] S1: Preparation of the base material. The base material includes a slurry and a fiber material;

[0030] The mass ratio of the slurry to the fiber material is 10:(0.2);

[0031] The raw materials of the slurry include aluminum, silicon carbide, and molybdenum. Among them, the mass ratio of aluminum, silicon carbide, and molybdenum is 1:(0.1):(0.02);

[0032] The raw materials of the fiber material include clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone. Before the preparation of the fiber material, the clay is pretreated to obtain a mixed material. Among them, the mass ratio of clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone is 10:(1):(0.4):(0.2):(0.1);

[0033] S2: Preparation of the base material. After the slurry and the fiber material are mixed and prepared, sintering treatment is carried out to obtain the base material;

[0034] S3: Forming treatment. After the base material is subjected to forming treatment, a high-modulus aluminum matrix silicon carbide foil material is obtained.

[0035] The clay selected is kaolin with a particle size of 20 nm.

[0036] The pretreatment method of the clay is as follows: The clay and acetone are added into a mixer, deionized water is added into the mixer, the mixer is set to stir at 800 r / min for 6 h, after the stirring is completed, it is left to react statically for 20 h, and the obtained product is defoamed to obtain a mixed material.

[0037] The mass of acetone is 5 - 7% of the mass of the clay, and the mass of deionized water is 40 times the mass of the clay.

[0038] The fiber material is prepared by the following method: Polylactic acid and N,N - dimethylformamide are added into a reaction kettle, the reaction kettle is set to heat up to 65 °C, the stirring speed is set to 120 r / min, and it is set to stir and keep warm for 10 min. After cooling to room temperature, the mixed material, chloroform, and polyvinylpyrrolidone are added, and it is set to stir at 400 r / min for 20 min. The obtained product is sent into an ultrasonic disperser, set to 100 W, and dispersed for 6 min to obtain a mixed solution. The mixed solution is subjected to electrospinning treatment to obtain the fiber material.

[0039] The electrospinning treatment method is as follows: The mixed solution is added into an electrospinning device, the injection speed is set to 0.4 ml / h, the voltage is 15 kV, and the receiving distance is 10 cm. The obtained product is cut and broken to obtain the fiber material.

[0040] The method for preparing the substrate is as follows: The slurry and the fiber material are added into a mixer, the mixer is set to stir at 800 r / min for 40 min, then the treatment agent is added, and stirring is continued for 6 min. The obtained product and water are added into a ball mill for wet ball milling treatment for 4 h. After the obtained product is defoamed, it is subjected to casting treatment to obtain a cast film. The cast film is subjected to biscuit firing and sintering treatment to obtain the substrate. Among them, the mass of the treatment agent is 0.8% of the mass of the slurry, the mass of water is 40% of the mass of the slurry, the temperature of biscuit firing is 300 °C, and the temperature of sintering is 800 °C.

[0041] The treatment agent selected is a mixture of polyacrylic acid, silane coupling agent - KH550, and glycerol, and the mass ratio of polyacrylic acid, silane coupling agent - KH550, and glycerol is 1:(0.1):(0.2).

[0042] The forming process is as follows: the base material is subjected to preliminary pressing treatment with a pressing thickness of 1 mm, followed by leveling and surface grinding and polishing treatment. The base material after the above treatment is cut into appropriate dimensions and then subjected to heat treatment at a heating temperature of 420 °C and a holding time of 10 min. After the heat treatment is completed, rolling treatment is carried out. The thickness of the rolled base material is 0.8 mm. Then, annealing treatment is carried out at a set temperature of 430 °C and a holding time of 1 h. The base material after the annealing treatment is rolled again with a thickness of 0.1 mm. After rolling, cleaning, drying, and surface grinding and polishing treatment are carried out, and then surface etching treatment is carried out according to requirements to obtain a high-modulus aluminum matrix silicon carbide foil.

[0043] Example Two

[0044] S1: Base material preparation. The base material includes slurry and fiber material;

[0045] The mass ratio of the slurry to the fiber material is 10:(0.3);

[0046] The raw materials of the slurry include aluminum, silicon carbide, and molybdenum. Among them, the mass ratio of aluminum, silicon carbide, and molybdenum is 1:(0.15):(0.03);

[0047] The raw materials of the fiber material include clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone. Before the preparation of the fiber material, the clay is pretreated to obtain a mixed material. Among them, the mass ratio of clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone is 10:(2):(0.5):(0.3):(0.2);

[0048] S2: Substrate preparation. After the slurry and the fiber material are mixed and prepared, sintering treatment is carried out to obtain a substrate;

[0049] S3: Forming treatment. After the substrate is subjected to forming treatment, a high-modulus aluminum matrix silicon carbide foil is obtained.

[0050] The clay selected is kaolin with a particle size of 40 nm.

[0051] The pretreatment method of the clay is as follows: the clay and acetone are added to a mixer, deionized water is added to the mixer, the mixer is set to stir at 900 r / min for 8 h, after the stirring is completed, it is left to react for 25 h, and the obtained product is defoamed to obtain a mixed material.

[0052] The mass of acetone is 6% of the mass of the clay, and the mass of deionized water is 50 times the mass of the clay.

[0053] The fiber material is prepared by the following method: polylactic acid and N,N-dimethylformamide are added into a reaction kettle. The reaction kettle is set to heat up to 70°C, the stirring speed is set to 140 r / min, and the heat preservation and stirring treatment is set for 15 min. After cooling to room temperature, a mixture, chloroform, and polyvinylpyrrolidone are added, and the stirring treatment is set at 500 r / min for 25 min. The obtained product is sent into an ultrasonic disperser, set at 150 W, and dispersed for 8 min to obtain a mixed solution. The mixed solution is subjected to electrospinning treatment to obtain the fiber material.

[0054] The method of electrospinning treatment is as follows: the mixed solution is added into an electrospinning device, the injection speed is set to 0.5 ml / h, the voltage is 17 kV, and the receiving distance is 15 cm. The obtained product is subjected to cutting and crushing treatment to obtain the fiber material.

[0055] The method of preparing the substrate is as follows: the slurry and the fiber material are added into a mixer. The mixer is set to stir at 1000 r / min for 45 min, and then a treatment agent is added, and the stirring treatment is continued for 8 min. The obtained product and water are added into a ball mill for wet ball milling treatment for 5 h. After the obtained product is defoamed, a casting treatment is carried out to obtain a cast film. The cast film is subjected to biscuit firing and sintering treatment to obtain the substrate. Among them, the mass of the treatment agent is 1% of the mass of the slurry, the mass of water is 45% of the mass of the slurry, the temperature of biscuit firing is 350°C, and the temperature of sintering is 900°C.

[0056] The treatment agent is a mixture of polyacrylic acid, silane coupling agent - KH550, and glycerol. The mass ratio of polyacrylic acid, silane coupling agent - KH550, and glycerol is 1:(0.15):(0.25).

[0057] The method of forming treatment is as follows: the substrate is subjected to preliminary pressing treatment, and the pressing thickness is 3 mm. Then, leveling and surface grinding and polishing treatments are carried out. The substrate after the above treatments is cut to a suitable size, and heat treatment is carried out. The heating temperature is 470°C, and the heat preservation time is 20 min. After the heat treatment is completed, rolling treatment is carried out. The thickness of the rolled substrate is 1.2 mm. Then, the temperature is set at 460°C, and annealing treatment is carried out for 2 h. After the annealing treatment is completed, the substrate is rolled again, and the thickness is 0.15 mm. After rolling, cleaning, drying, and surface grinding and polishing treatments are carried out. Then, surface etching treatment is carried out according to requirements to obtain a high-modulus aluminum-based silicon carbide foil.

[0058] Example Three

[0059] S1: Base material preparation. The base material includes a slurry and a fiber material;

[0060] The mass ratio of the slurry to the fiber material is 10:(0.4);

[0061] The raw materials of the slurry include aluminum, silicon carbide, and molybdenum. Among them, the mass ratio of aluminum, silicon carbide, and molybdenum is 1:(0.2):(0.04);

[0062] The raw materials of the fiber material include clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone. Before preparing the fiber material, the clay is pretreated to obtain a mixed material. Among them, the mass ratio of clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone is 10:(1):(0.6):(0.4):(0.3);

[0063] S2: Substrate preparation. After the slurry and the fiber material are mixed and prepared, sintering treatment is carried out to obtain the substrate;

[0064] S3: Molding treatment. After the substrate is subjected to molding treatment, a high-modulus aluminum-based silicon carbide foil is obtained.

[0065] The clay selected is kaolin with a particle size of 60 nm.

[0066] The pretreatment method of the clay is as follows: The clay and acetone are added to a mixer, deionized water is added to the mixer, the mixer is set to stir at 1000 r / min for 10 h, after the stirring is completed, it is left to react for 30 h, and the obtained product is defoamed to obtain a mixed material.

[0067] The mass of acetone is 7% of the mass of the clay, and the mass of deionized water is 60 times the mass of the clay.

[0068] The fiber material is prepared by the following method: Polylactic acid and N,N-dimethylformamide are added to a reaction kettle, the reaction kettle is set to heat up to 75 °C, the stirring speed is set to 160 r / min, and the heat preservation stirring treatment is set for 20 min. After cooling to room temperature, the mixed material, chloroform, and polyvinylpyrrolidone are added, and the stirring treatment is set at 600 r / min for 30 min. The obtained product is sent into an ultrasonic disperser, set at 200 W, and dispersed for 10 min to obtain a mixed solution. The mixed solution is subjected to electrospinning treatment to obtain the fiber material.

[0069] The method of electrospinning treatment is as follows: The mixed solution is added to an electrospinning device, the injection speed is set to 0.6 ml / h, the voltage is 20 kV, and the receiving distance is 20 cm. The obtained product is subjected to cutting and crushing treatment to obtain the fiber material.

[0070] The method for preparing the substrate is as follows: The slurry and the fiber material are added into a mixer. The mixer is set to stir at 1200 r / min for 50 min. Then, the treating agent is added and stirring continues for 10 min. The obtained product and water are added into a ball mill for wet ball milling treatment for 6 h. After the obtained product is defoamed, casting treatment is carried out to obtain a cast film. The cast film is subjected to biscuit firing and sintering treatment to obtain the substrate. Among them, the mass of the treating agent is 1.2% of the mass of the slurry, the mass of water is 50% of the mass of the slurry, the temperature of biscuit firing is 400 °C, and the temperature of sintering is 1000 °C.

[0071] The treating agent is a mixture of polyacrylic acid, silane coupling agent - KH550, and glycerol. The mass ratio of polyacrylic acid, silane coupling agent - KH550, and glycerol is 1:(0.2):(0.3).

[0072] The method for forming treatment is as follows: The substrate is subjected to preliminary pressing treatment with a pressing thickness of 5 mm. Then, leveling and surface grinding and polishing treatments are carried out. The substrate that has completed the above treatments is cut to a suitable size and subjected to heating treatment at a heating temperature of 520 °C and a holding time of 30 min. After the heating treatment is completed, rolling treatment is carried out. The thickness of the rolled substrate is 1.5 mm. Then, annealing treatment is carried out at a set temperature of 500 °C and a holding time of 3 h. After the annealing treatment is completed, the substrate is rolled again with a thickness of 0.2 mm. After rolling is completed, cleaning, drying, and surface grinding and polishing treatments are carried out. Then, surface etching treatment is carried out according to requirements to obtain a high-modulus aluminum matrix silicon carbide foil.

[0073] Comparative Example 1. The difference between this comparative example and Example 1 is that: In this comparative example, the treating agent is not added.

[0074] Comparative Example 2. The difference between this comparative example and Example 1 is that: In this comparative example, the fiber material is not contained.

[0075] Comparative Example 3. The difference between this comparative example and Example 1 is that: In this comparative example, an equal amount of basalt fiber is selected to replace the fiber material.

[0076] Comparative Example 4. The difference between this comparative example and Example 1 is that: In this comparative example, the clay is not pretreated.

[0077] Performance test: The aluminum matrix silicon carbide foils prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 are subjected to performance tests. The obtained test data are recorded in the following table:

[0078]

[0079] In the performance test, the strength performance of the aluminum matrix silicon carbide foils prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 was tested by the test method in GB / T 228-2010;

[0080] The elongation performance of the aluminum matrix silicon carbide foils prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 was tested by the test method in GB / T 4161-2007.

[0081] It can be seen that the strength performance and elongation performance of the aluminum matrix silicon carbide foils prepared in Comparative Example 1, 2, 3 and 4 are both lower than those in Example 1, 2 and 3; this shows that: during the preparation process of the foil, the slurry and the fiber material are pre-mixed. Among them, the electrospun fibers are prepared through the modification system of clay in the fiber material. The fiber network formed by the composite of clay and polylactic acid is embedded in the aluminum matrix. The external load is transferred from the matrix to the high-strength fibers through the interfacial shear stress, effectively dispersing the stress concentration. Chloroform is used as a solvent to adjust the viscosity of polylactic acid. N,N-dimethylformamide can delay the solvent evaporation rate. Polyvinylpyrrolidone can improve the fiber morphology and avoid the generation of bead-like structures. Finally, the fiber material is obtained through electrospinning treatment. During the electrospinning treatment process, the fiber material can form a nano-scale fiber structure, greatly increasing the specific surface area, which is beneficial to playing a binding effect enhancement in the foil, thereby effectively improving the strength and ductility of the foil;

[0082] During the preparation process of the base material, polyacrylic acid is used as an anionic dispersant. Its carboxylic acid groups are adsorbed on the surfaces of silicon carbide and molybdenum particles through electrostatic repulsion to form a double-layer structure, effectively preventing particle agglomeration. The amino group of KH-550 reacts with the hydroxyl groups on the surface of the aluminum matrix to form a chemical bond, which can effectively enhance the interfacial bonding strength between the base material and the fiber material and inhibit the deformation generated when the material is stressed. The addition of glycerol can improve the fluidity of the slurry, promote the dispersion of the treatment agent and the fiber material in the slurry, and further improve the bonding strength between the fiber material and the base material, thereby improving the strength performance of the foil.

[0083] By comparing and analyzing the relevant data in the table, it can be seen that the aluminum matrix silicon carbide foil prepared by the present invention not only has good strength performance but also has excellent elongation performance. This shows that the high-modulus aluminum matrix silicon carbide foil provided by the present invention has a broader market prospect and is more suitable for promotion.

[0084] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A preparation process for a high-modulus aluminum matrix silicon carbide foil, characterized in that, It includes the following steps: S1: Base material preparation, where the base material includes a slurry and a fiber material; The mass ratio of the slurry to the fiber material is 10:(0.2 - 0.4); The raw materials of the slurry include aluminum, silicon carbide, and molybdenum, where the mass ratio of aluminum, silicon carbide, and molybdenum is 1:(0.1 - 0.2):(0.02 - 0.04); The raw materials of the fiber material include clay, polylactic acid, chloroform, N,N - dimethylformamide, and polyvinylpyrrolidone. The clay is pretreated before preparing the fiber material to obtain a mixture. Among them, the mass ratio of clay, polylactic acid, chloroform, N,N - dimethylformamide, and polyvinylpyrrolidone is 10:(1 - 3):(0.4 - 0.6):(0.2 - 0.4):(0.1 - 0.3); S2: Substrate preparation. After the slurry and the fiber material are mixed and prepared, they are sintered to obtain a substrate; S3: Forming treatment. After the substrate is formed, a high - modulus aluminum - based silicon carbide foil is obtained.

2. The preparation process of the high modulus aluminum matrix silicon carbide foil according to claim 1, characterized in that, The clay selected is kaolin with a particle size of 20 - 60 nm.

3. The preparation process of the high-modulus aluminum matrix silicon carbide foil according to claim 1, characterized in that, The pretreatment method of the clay is as follows: The clay and acetone are added to a mixer, deionized water is added to the mixer, the mixer is set to stir at 800 - 1000 r / min for 6 - 10 h, after stirring, it is left to react statically for 20 - 30 h, and the obtained product is defoamed to obtain a mixture.

4. The preparation process of the high-modulus aluminum matrix silicon carbide foil according to claim 3, characterized in that, The mass of acetone is 5 - 7% of the mass of the clay, and the mass of deionized water is 40 - 60 times the mass of the clay.

5. The preparation process of the high-modulus aluminum matrix silicon carbide foil according to claim 1, characterized in that, The fiber material is prepared by the following method: Polylactic acid and N,N - dimethylformamide are added to a reaction kettle, the reaction kettle is set to heat up to 65 - 75 °C, the stirring speed is set to 120 - 160 r / min, and the heat - preservation stirring treatment is set for 10 - 20 min. After cooling to room temperature, the mixture, chloroform, and polyvinylpyrrolidone are added, and it is set to stir at 400 - 600 r / min for 20 - 30 min. The obtained product is sent into an ultrasonic disperser, set to 100 - 200 W, and dispersed for 6 - 10 min to obtain a mixed solution. The mixed solution is subjected to electrospinning treatment to obtain the fiber material.

6. The preparation process of the high-modulus aluminum matrix silicon carbide foil according to claim 5, characterized in that, The method of the electrospinning treatment is as follows: The mixed solution is added to an electrospinning device, the injection speed is set to 0.4 - 0.6 ml / h, the voltage is 15 - 20 kV, and the receiving distance is 10 - 20 cm. The obtained product is cut and broken to obtain the fiber material.

7. The preparation process of the high modulus aluminum matrix silicon carbide foil according to claim 1, characterized in that, The method of preparing the substrate is as follows: The slurry and the fiber material are added to a mixer, the mixer is set to stir at 800 - 1200 r / min for 40 - 50 min, then a treatment agent is added, and stirring is continued for 6 - 10 min. The obtained product and water are added to a ball mill for wet ball - milling treatment for 4 - 6 h. After the obtained product is defoamed, a casting treatment is carried out to obtain a casting film. The casting film is subjected to green sintering and sintering treatment to obtain the substrate. Among them, the mass of the treatment agent is 0.8 - 1.2% of the mass of the slurry, the mass of water is 40 - 50% of the mass of the slurry, the temperature of the green sintering is 300 - 400 °C, and the temperature of the sintering is 800 - 1000 °C.

8. The preparation process of the high-modulus aluminum matrix silicon carbide foil according to claim 7, characterized in that, The treatment agent is selected as a mixture of polyacrylic acid, silane coupling agent - KH550, and glycerol, and the mass ratio of polyacrylic acid, silane coupling agent - KH550, and glycerol is 1:(0.1 - 0.2):(0.2 - 0.3).

9. A high modulus aluminum matrix silicon carbide foil, characterized in that, It is prepared by the preparation process of the high-modulus aluminum-based silicon carbide foil according to any one of claims 1 to 8.

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