High-modulus aluminum-based silicon carbide foil and preparation process thereof

Abstract

The invention relates to the technical field of aluminum-based silicon carbide foils, in particular to a high-modulus aluminum-based silicon carbide foil and a preparation technology thereof. The preparation technology comprises the steps that S1, a base material is prepared, and the base material comprises 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 comprise aluminum, silicon carbide and molybdenum, and the mass ratio of the aluminum to the silicon carbide to the molybdenum is 1: (0.1-0.2): (0.02-0.04). According to the invention, N, N-dimethylformamide can delay the volatilization rate of a solvent, polyvinylpyrrolidone can improve the morphology of the fiber and avoid the generation of a bead-shaped structure, and finally, the fiber material is obtained through electrostatic spinning treatment, and in the electrostatic spinning treatment process, the fiber material can form a nano-scale fiber structure, so that the specific surface area is greatly increased, and the specific surface area of the fiber material is greatly increased. And a bonding effect enhancing effect can be played in the foil, so that the strength and the ductility of the foil are effectively improved.

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 its preparation process. 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 advantages of high electrical conductivity, high thermal conductivity and good processing performance of aluminum, as well as 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 the aluminum liquid to fully wrap the silicon carbide particles during the preparation process, resulting in a problem of 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 its preparation process. Summary of the Invention

[0004] The purpose of the present invention is to provide a high modulus aluminum matrix silicon carbide foil and its preparation process. 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 use performance of the high modulus aluminum matrix silicon carbide foil.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: In the first aspect, the present invention provides a preparation process of a high modulus aluminum matrix silicon carbide foil, including the following steps: 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, among which 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 which 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, sintering treatment is carried out to obtain a substrate; S3: Forming treatment, after the substrate is subjected to forming treatment, a high modulus aluminum matrix silicon carbide foil is obtained.

[0006] Further, the clay is selected as kaolin with a particle size of 20 - 60 nm.

[0007] Further, 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 - 1000 r / min for 6 - 10 h, after the stirring is completed, it is left to react statically for 20 - 30 h, and the obtained product is defoamed to obtain a mixed material.

[0008] Further, 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.

[0009] Further, 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 mixed material, 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.

[0010] Further, 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.

[0011] Further, 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 - 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 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 biscuit firing 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 biscuit firing is 300 - 400 °C, and the temperature of sintering is 800 - 1200 °C.

[0012] Further, 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).

[0013] Further, the method of the forming process is as follows: the base material is subjected to preliminary pressing treatment with a pressing thickness of 1 - 5 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 heating treatment at a heating temperature of 420 - 520 °C and a heat preservation time of 10 - 30 min. After the heating treatment is completed, rolling treatment is carried out, and the thickness of the rolled base material 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 base material is rolled again with a thickness of 0.1 - 0.2 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.

[0014] In a second aspect, the present invention also provides a high-modulus aluminum matrix silicon carbide foil, which is prepared by the preparation process of the high-modulus aluminum matrix silicon carbide foil.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, 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, 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 exerting the binding effect enhancement in the foil, thereby effectively improving the strength and ductility of the foil.

[0016] 2. In the present invention, through the addition of the treatment agent during the preparation process of the base material, polyacrylic acid is used as an anionic dispersant, and 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. Description of the Drawings

[0017] Figure 1 It is a flowchart of a high-modulus aluminum matrix silicon carbide foil and its preparation process proposed by the invention. Detailed Embodiments

[0018] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0019] It should be noted that the raw materials used in the following embodiments are all commercially available raw materials.

[0020] Embodiment 1

[0021] 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). 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). 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 mixture. Among them, the mass ratio of clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone is 10:(1):(0.4):(0.2):(0.1). S2: Substrate preparation. After the slurry and the fiber material are mixed and prepared, sintering treatment is carried out to obtain a substrate. S3: Molding treatment. After the substrate is subjected to molding treatment, a high-modulus aluminum-based silicon carbide foil is obtained.

[0022] The clay selected is kaolin with a particle size of 20 nm.

[0023] 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 r / min for 6 h, after the stirring is completed, it is left to react for 20 h, and the obtained product is defoamed to obtain a mixture.

[0024] 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.

[0025] 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 °C, the stirring speed is set to 120 r / min, the heat preservation and stirring treatment is set for 10 min. After cooling to room temperature, the mixture, chloroform, and polyvinylpyrrolidone are added, and the stirring treatment is set at 400 r / min for 20 min. The obtained product is sent into an ultrasonic disperser, set at 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.

[0026] The method of electrospinning treatment is as follows: The mixed solution is added into the electrospinning equipment, 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 crushed to obtain the fiber material.

[0027] The method of substrate preparation is as follows: The slurry and the fiber material are added into a mixer, and the mixer is set to stir at 800 r / min for 40 min. Then, a 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, 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 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.

[0028] 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).

[0029] The method of forming treatment is as follows: The substrate is subjected to preliminary pressing treatment, and the pressing thickness is 1 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 subjected to heating treatment at a heating temperature of 420 °C for a holding time of 10 min. After the heating treatment is completed, rolling treatment is carried out. The thickness of the rolled substrate is 0.8 mm. Then, the temperature is set to 430 °C and annealing treatment is carried out for a holding time of 1 h. After the annealing treatment is completed, the substrate is rolled again to a thickness of 0.1 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.

[0030] Example 2

[0031] S1: Base material preparation, the base material includes slurry and fiber material; The mass ratio of the slurry and the fiber material is 10:(0.3); 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); The raw materials of the fiber material include clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone. The clay is pretreated before the preparation of the fiber material 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); S2: Substrate preparation. After the slurry and fiber material are mixed and prepared, sintering treatment is carried out to obtain the substrate. S3: Molding treatment. After the substrate is subjected to molding treatment, a high-modulus aluminum matrix silicon carbide foil is obtained.

[0032] The clay selected is kaolin with a particle size of 40 nm.

[0033] 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 900 r / min for 8 h, after the stirring is completed, it is left to react statically for 25 h, and the obtained product is defoamed to obtain a mixture.

[0034] 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.

[0035] 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, the heat preservation and stirring treatment is set for 15 min, after cooling to room temperature, the mixture, chloroform, and polyvinylpyrrolidone are added, 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, and the mixed solution is subjected to electrospinning treatment to obtain the fiber material.

[0036] 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 cut and broken to obtain the fiber material.

[0037] The method of substrate preparation is as follows: The slurry and fiber material are added into a mixer, the mixer is set to stir at 1000 r / min for 45 min, then a treatment agent is added, and 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, casting treatment is carried out to obtain a cast film, and the cast film is subjected to green sintering 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 green sintering is 350 °C, and the temperature of sintering is 900 °C.

[0038] 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:(0.15):(0.25).

[0039] The method of forming treatment is as follows: The base material is subjected to preliminary pressing treatment with a pressing thickness of 3 mm, and then leveling and surface grinding and polishing treatments are carried out. The base material after the above treatments is cut into appropriate sizes, and then heat treatment is carried out at a heating temperature of 470 °C and a heat preservation time of 20 min. After the heat treatment is completed, rolling treatment is carried out. The thickness of the rolled base material is 1.2 mm. Then, annealing treatment is carried out at a set temperature of 460 °C and a heat preservation time of 2 h. After the annealing treatment is completed, the base material is rolled again with a thickness of 0.15 mm. After rolling, cleaning, drying, and surface grinding and polishing treatments are carried out, and then surface etching treatment is carried out according to requirements to obtain high-modulus aluminum matrix silicon carbide foil.

[0040] Example Three

[0041] S1: Base material preparation, where the base material includes slurry and fiber material; The mass ratio of the slurry to the fiber material is 10:(0.4); 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); 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 mixture. Among them, the mass ratio of clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinylpyrrolidone is 10:(1):(0.6):(0.4):(0.3); S2: Substrate preparation. After the slurry and the fiber material are mixed and prepared, sintering treatment is carried out to obtain a substrate; S3: Forming treatment. After the substrate is subjected to forming treatment, high-modulus aluminum matrix silicon carbide foil is obtained.

[0042] The clay selected is kaolin with a particle size of 60 nm.

[0043] 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 mixture.

[0044] 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.

[0045] The fibrous 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 75°C, the stirring speed is set to 160 r / min, and the heat preservation and stirring treatment is set for 20 min. After cooling to room temperature, a mixture, 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 the dispersion treatment is carried out for 10 min to obtain a mixed solution. The mixed solution is subjected to electrospinning treatment to obtain the fibrous material.

[0046] The method of electrospinning treatment is as follows: the mixed solution is added into 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 fibrous material.

[0047] The method of substrate preparation is as follows: the slurry and the fibrous material are added into a mixer. The mixer is set to stir at 1200 r / min for 50 min, then a treatment agent is added, and the stirring treatment is continued 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 treatment 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.

[0048] 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:(0.2):(0.3).

[0049] The method of forming treatment is as follows: the substrate is subjected to preliminary pressing treatment, and the pressing thickness is 5 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 520°C, and the heat preservation time is 30 min. After the heat treatment is completed, rolling treatment is carried out. The thickness of the rolled substrate is 1.5 mm. Then, the temperature is set at 500°C, and annealing treatment is carried out for 3 h. After the annealing treatment is completed, the substrate is rolled again, and the thickness is 0.2 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.

[0050] Comparative Example 1. The difference between this comparative example and Example 1 is that no treatment agent is added in this comparative example.

[0051] Comparative Example 2. The difference between this comparative example and Example 1 is that this comparative example does not contain fibrous material.

[0052] Comparative Example 3. The difference between this comparative example and Example 1 is that: in this comparative example, an equal amount of basalt fibers was selected to replace the fiber material.

[0053] Comparative Example 4. The difference between this comparative example and Example 1 is that: in this comparative example, the clay was not pretreated.

[0054] 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 were subjected to performance tests, and the obtained test data were recorded in the following table:

[0055] 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; 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.

[0056] It can be seen that the strength performance and elongation performance of the aluminum matrix silicon carbide foils prepared in Comparative Examples 1, 2, 3 and 4 are lower than those in Examples 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 the clay in the fiber material. The fiber network formed by the composite of the 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 play the role of enhancing the binding effect in the foil, thereby effectively improving the strength and ductility performance of the foil; Through the addition of the treatment agent during the preparation process of the base material, polyacrylic acid is used as an anionic dispersant. Its carboxyl 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.

[0057] 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 popularization.

[0058] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means 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 can be combined in a suitable manner in any one or more embodiments or examples.

[0059] The preferred embodiments of the present invention disclosed above are only used to help explain 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 understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A process for preparing a high modulus aluminum-based silicon carbide foil, characterized in that: The following steps are involved: S1: base material preparation, the base material includes slurry and fiber material; The mass ratio of pulp to 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); The raw materials of the fiber material include clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinyl pyrrolidone. Before preparing the fiber material, the clay is pretreated to obtain a mixture, wherein the mass ratio of clay, polylactic acid, chloroform, N,N-dimethylformamide, and polyvinyl pyrrolidone is 10: (1-3): (0.4-0.6): (0.2-0.4): (0.1-0.3); S2: preparing the substrate, mixing the slurry and the fiber material, and then sintering the mixture to obtain the 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-based silicon carbide foil according to claim 1, characterized in that: The clay is kaolin with a particle size of 20 to 60 nm.

3. The preparation process of the high modulus aluminum-based silicon carbide foil according to claim 1, characterized in that: The clay pretreatment method is as follows: clay and acetone are added into a mixer, deionized water is added into the mixer, the mixer is set to 800-1000 r / min for stirring for 6-10 hours, after stirring, the mixture is allowed to stand for reaction for 20-30 hours, and the obtained product is subjected to defoaming treatment to obtain a mixture.

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

5. The process for preparing the high modulus aluminum-based 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 temperature of the reaction kettle is set to 65-75°C, the stirring speed is set to 120-160r / min, and the heat preservation and stirring process is set to 10-20min. After cooling to room temperature, a mixed material, chloroform and polyvinyl pyrrolidone are added, and the stirring process is set to 400-600r / min for 20-30min. The obtained product is sent to an ultrasonic disperser, set to 100-200W, and dispersed for 6-10min to obtain a mixed solution, and the mixed solution is subjected to electrostatic spinning to obtain a fiber material.

6. The process for preparing the high modulus aluminum-based silicon carbide foil according to claim 5, characterized in that: The electrospinning treatment method is as follows: the mixed liquid is added into the electrospinning equipment, the injection speed is set to 0.4-0.6 ml / h, the voltage is 15-20 kV, the receiving distance is 10-20 cm, and the obtained product is cut and crushed to obtain fiber material.

7. The process for preparing the high modulus aluminum-based silicon carbide foil according to claim 1, characterized in that: The method for preparing the substrate is as follows: slurry and fiber material are added to a mixer, the mixer is set to 800-1200r / min and stirred for 40-50min, then a treatment agent is added, and the stirring is continued for 6-10min, the obtained product and water are added to a ball mill for wet ball milling for 4-6h, the obtained product is defoamed and then cast to obtain a cast film, the cast film is biscuit-fired and sintered to obtain a substrate, wherein 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 biscuit temperature is 300-400°C, and the sintering temperature is 800-1000°C.

8. The process for preparing the high modulus aluminum-based silicon carbide foil according to claim 7, characterized in that: 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).

9. The process for preparing the high modulus aluminum-based silicon carbide foil according to claim 1, characterized in that: The forming treatment method is as follows: the substrate is subjected to preliminary pressing treatment with a pressing thickness of 1 to 5 mm, and then leveling and surface grinding and polishing treatment are performed, the substrate that has completed the above treatment is cut to a suitable size, and heated at a heating temperature of 420 to 520° C. for a holding time of 10 to 30 minutes. After the heating treatment is completed, rolling treatment is performed, and the thickness of the substrate after rolling is 0.8 to 1.5 mm. Then, the temperature is set at 430 to 500° C. and the holding time is 1 to 3 hours for annealing treatment. After the annealing treatment, the substrate is rolled again with a thickness of 0.1 to 0.2 mm. After rolling, cleaning, drying, and surface grinding and polishing treatment are performed, and then surface etching treatment is performed according to demand to obtain a high modulus aluminum-based silicon carbide foil.

10. A high modulus aluminum-based silicon carbide foil, characterized in that: The high modulus aluminum-based silicon carbide foil is prepared by the preparation process of any one of claims 1 to 9.

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