Method for preparing high-volume-fraction and high-density SiC / Al composite material from SiC / Al processing waste

Abstract

The invention discloses a method for preparing a high-volume-fraction and high-density SiC / Al composite material by using SiC / Al processing waste, and relates to a preparation method of the SiC / Al composite material. In order to solve the problems that the density is low and the number of holes is large when an existing SiC / Al composite material is recycled in a mode of not separating a reinforcement body from a matrix and then used for preparing the composite material, the invention provides the method for preparing the high-volume-fraction and high-density SiC / Al composite material by using the SiC / Al processing waste material. According to the method, the pressure infiltration technology and the hot pressing sintering technology are combined, the SiC / Al machining chippings are subjected to cold pressing and pre-crushing so as to reduce the particle size of the chippings, dense arrangement of chipping particles is promoted, and then the volume fraction of SiC is indirectly increased; and the SiC / Al composite material processing chips are heated to a certain temperature and are subjected to one-way hot pressing to a specified height, so that the SiC particle content and the wear resistance can be improved, and the density of the material obtained by adopting the pressure infiltration technology is close to 100%.

Description

Technical Field

[0001] This invention relates to a method for preparing SiC / Al composite materials. Background Technology

[0002] SiC / Al composite materials are widely used in high-end fields such as aerospace and electronic packaging due to their high specific strength and excellent thermal conductivity. However, the manufacturing process of SiC / Al composite materials generates a large amount of waste. With the increasing use of these materials, failure to properly recycle and utilize this waste will not only lead to resource waste and economic losses but also environmental pollution. Therefore, the recycling of SiC / Al composite material waste has become a key issue in the fields of resource recycling and environmental protection.

[0003] Currently, the most common preparation processes for SiC / Al composite materials include stir casting, powder metallurgy, and pressure infiltration. Stir casting involves adding SiC reinforcement to molten Al alloy matrix, stirring to ensure uniform distribution, and then casting the mixture into a mold for solidification. Its main advantage is its simplicity; however, the resulting composite material often exhibits casting defects, sometimes even severe interfacial reactions, and has a low volume fraction, resulting in poor wear resistance. Powder metallurgy involves mixing SiC and Al alloy powders, cold-pressing them at room temperature to obtain a preform, and then directly forming it through sintering, hot pressing, and hot rolling. Its advantages include flexible control of the reinforcement volume fraction and a preparation temperature lower than the interfacial reaction temperature between SiC and Al. However, its disadvantages include low density, often requiring secondary processing (such as hot isostatic pressing) to improve density, complex preparation processes, long production cycles, and unsuitability for mass production. Pressure infiltration is a process in which a liquid matrix alloy is injected into the pores of a reinforcing preform under external pressure (pneumatic or mechanical pressure), and the composite material is prepared after cooling and solidification. This method can overcome the surface tension between the liquid matrix metal and the reinforcement by applying external pressure, resulting in composite materials with high density and few defects. The process is simple, the equipment is not complex, and it can produce high-quality composite materials in a short cycle and in large quantities.

[0004] Recycling SiC / Al composite material waste to produce SiC / Al composites reduces manufacturing costs and solves the environmental pollution problem caused by waste. Currently, SiC / Al composite material recycling technologies include separating the reinforcement and matrix, and not separating the reinforcement and matrix. Separating the reinforcement and matrix involves remelting the aluminum alloy from SiC / Al processing waste into a liquid state at high temperatures, thus separating solid SiC particles from liquid aluminum alloy. The recovered SiC and aluminum alloy can be reused in composite material preparation. However, because separating the reinforcement and matrix involves liquefying aluminum at high temperatures to achieve solid-liquid separation, liquid aluminum is highly reactive and will react with SiC to form Al4C3. Furthermore, at high temperatures, active elements (such as Mg) in the molten aluminum alloy will rapidly oxidize and be lost, resulting in a significantly different composition of the recovered aluminum alloy compared to the original alloy. Therefore, the quality of the indirectly recycled product is extremely low. At the same time, the high energy consumption caused by high-temperature remelting contradicts the idea of ​​low-cost recycling. The method of preparing high-quality SiC / Al composite powder from SiC / Al processing waste without separating the reinforcement and matrix involves cleaning and refining the waste. This powder is then sintered into SiC / Al composite materials using powder metallurgy. Compared to separating the reinforcement and matrix, the method of directly recycling the waste to prepare composite materials is simple and efficient. However, the resulting composite materials often have low density and numerous pores, requiring densification treatment to improve density, which further increases the cost of composite material recycling. Therefore, there is an urgent need to explore a simple, efficient, and high-quality method for recycling SiC / Al composite material processing debris to prepare high-volume-fraction, high-density SiC / Al composite materials. Summary of the Invention

[0005] To address the problems of low density and numerous pores in existing methods of recycling SiC / Al composites without separating the reinforcement and matrix, this invention proposes a method for preparing high-volume-fraction, high-density SiC / Al composites using SiC / Al processing waste.

[0006] The present invention describes a method for preparing high-volume-fraction, high-density SiC / Al composite materials using SiC / Al processing waste, which is carried out according to the following steps:

[0007] Step 1: Mix the SiC / Al composite material processing debris and SiC particles using a powder mixer, then load the mixture into a pressure impregnation mold. Apply a pre-pressure of 50kN~100kN using a press and hold the pressure for 10min~20min. Then, place the mold along with the debris and SiC particles into a heating furnace and heat it from room temperature to 540℃~560℃ and hold the temperature for 10min~20min. After that, use a press at 540℃~560℃ to press the debris and SiC particles to 50%~70% of their original height and hold the pressure for 5min~10min. Then, cool it to room temperature to obtain the SiC / Al composite material preform.

[0008] Step 2: Melt the aluminum alloy to obtain molten aluminum alloy;

[0009] The aluminum alloy is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 10.0~20.0%, the mass fraction of Mg is 0.2~2.0%, the mass ratio of Mg to Cu is 1:2.5~4, and Al is the balance.

[0010] Step 3: Heat the mold containing the SiC / Al composite material preform obtained in Step 1 from room temperature to 540℃~600℃ and hold it for 10min~20min. Pour the molten aluminum alloy obtained in Step 2 into the mold containing the SiC / Al composite material preform and perform pressure impregnation.

[0011] The pressure impregnation process is as follows: a pressure of 10kN to 30kN is applied using a press and the pressure is maintained for 3 to 5 minutes, so that the aluminum alloy liquid impregnates into the pores of the SiC / Al composite material preform.

[0012] Step 4: After the aluminum alloy liquid solidifies, place the mold and the prepared composite material directly in the air to cool. Finally, demold to obtain a high volume fraction, high density SiC / Al composite material.

[0013] The present invention has the following beneficial effects:

[0014] 1. This invention combines pressure infiltration and hot-pressing sintering technologies. First, SiC / Al processing debris is cold-pressed and pre-crushed to reduce particle size and promote dense particle packing, thereby indirectly increasing the SiC volume fraction. Then, the SiC / Al composite processing debris is heated to a certain temperature and unidirectionally hot-pressed to a specified height, which helps to increase the high volume fraction content of SiC particles, improving the material's wear resistance, while the volume fraction is controllable within a certain range. The pressure infiltration technology fully fills the pores of the preform obtained by hot-pressing sintering with molten aluminum alloy, resulting in a material density close to 100%. This solves the problems of low density and high cost of increasing density in traditional powder metallurgy methods, as well as the poor wear resistance caused by the low SiC volume fraction when forming SiC / Al debris with Al alloy in pressure infiltration methods. Simultaneously, the heat preservation step during the hot-pressing process of SiC / Al processing debris removes residual organic solvents from the waste surface, preventing the formation of harmful Al4C3 phases.

[0015] 2. This invention uses SiC / Al composite material processing debris to replace part of the SiC particles as filler, so that the SiC particles in the SiC / Al composite material prepared by infiltration exhibit a non-uniform aggregated distribution. The aggregated SiC particles act as a whole, and together with the larger SiC particles mixed in, the two types of particles play a hybrid reinforcement role. Compared with the traditional single-size and uniformly distributed SiC / Al composite material, its wear resistance and friction coefficient are further improved.

[0016] 3. This invention uses an aluminum alloy containing a large number of alloying elements, with Si being the most abundant. The large amount of Si can introduce a large number of wear-resistant single-crystal Si particles during alloy solidification, which can improve the wear resistance of the material. Cu and Mg elements added in a certain proportion can form reinforcing phases such as Al2Cu and Al2CuMg, which can increase the wear resistance of the material and increase the strength of the matrix alloy, ensuring that the brake disc has sufficient strength to ensure its safety.

[0017] 4. The aluminum alloy used in this invention contains a large amount of Si elements and some Cu and Mg elements. The introduction of alloying elements lowers the melting point of the alloy and improves its fluidity. Furthermore, the SiC / Al composite material processing debris is coated with aluminum alloy, and the SiC / Al composite material processing debris has good wettability with the aluminum alloy liquid. This reduces the temperature of the preform, the temperature of the impregnated aluminum alloy liquid, and the impregnation pressure during the pressure impregnation process, effectively preventing the occurrence of interfacial reactions, reducing the process difficulty, and ensuring the high density of the material.

[0018] 5. The process of this invention is simple and easy to operate, does not require the use of environmentally harmful chemical reagents, and achieves efficient utilization of SiC / Al composite material debris. It is energy-saving, environmentally friendly and low-cost, and easy to realize large-scale industrial production and application. Attached Figure Description

[0019] Figure 1 These are macroscopic photographs of the SiC / Al composite material prepared in Example 1;

[0020] Figure 2 This is a metallographic photograph of the SiC / Al composite material prepared in Example 1. Detailed Implementation

[0021] The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any reasonable combination of the specific embodiments.

[0022] Specific Implementation Method 1: This implementation method for preparing high-volume-fraction, high-density SiC / Al composite materials using SiC / Al processing waste is carried out according to the following steps:

[0023] Step 1: Mix the SiC / Al composite material processing debris and SiC particles using a powder mixer, then load the mixture into a pressure impregnation mold. Apply a pre-pressure of 50kN~100kN using a press and hold the pressure for 10min~20min. Then, place the mold along with the debris and SiC particles into a heating furnace and heat it from room temperature to 540℃~560℃ and hold the temperature for 10min~20min. After that, use a press at 540℃~560℃ to press the debris and SiC particles to 50%~70% of their original height and hold the pressure for 5min~10min. Then, cool it to room temperature to obtain the SiC / Al composite material preform.

[0024] Step 2: Melt the aluminum alloy to obtain molten aluminum alloy;

[0025] The aluminum alloy is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 10.0~20.0%, the mass fraction of Mg is 0.2~2.0%, the mass ratio of Mg to Cu is 1:2.5~4, and Al is the balance.

[0026] Step 3: Heat the mold containing the SiC / Al composite material preform obtained in Step 1 from room temperature to 540℃~600℃ and hold it for 10min~20min. Pour the molten aluminum alloy obtained in Step 2 into the mold containing the SiC / Al composite material preform and perform pressure impregnation.

[0027] The pressure impregnation process is as follows: a pressure of 10kN to 30kN is applied using a press and the pressure is maintained for 3 to 5 minutes, so that the aluminum alloy liquid impregnates into the pores of the SiC / Al composite material preform.

[0028] Step 4: After the aluminum alloy liquid solidifies, place the mold and the prepared composite material directly in the air to cool. Finally, demold to obtain a high volume fraction, high density SiC / Al composite material.

[0029] This embodiment has the following beneficial effects:

[0030] 1. This embodiment combines pressure infiltration and hot-pressing sintering technologies. First, SiC / Al processing debris is cold-pressed and pre-crushed to reduce particle size and promote dense particle packing, thereby indirectly increasing the SiC volume fraction. Then, the SiC / Al composite processing debris is heated to a certain temperature and unidirectionally hot-pressed to a specified height, which helps to increase the high volume fraction content of SiC particles, improving the material's wear resistance, while the volume fraction remains controllable within a certain range. Pressure infiltration technology fully fills the pores of the preform obtained by hot-pressing sintering with molten aluminum alloy, resulting in a material density close to 100%. This solves the problems of low density and high cost of increasing density in traditional powder metallurgy methods, as well as the poor wear resistance caused by the low SiC volume fraction when forming SiC / Al debris with Al alloy in pressure infiltration. Simultaneously, the heat preservation step during the hot-pressing process of SiC / Al processing debris removes residual organic solvents from the waste surface, preventing the formation of harmful Al4C3 phases.

[0031] 2. In this embodiment, SiC / Al composite material processing debris is used to replace part of the SiC particles as filler, so that the SiC particles in the SiC / Al composite material prepared by impregnation exhibit a non-uniform aggregated distribution. The aggregated SiC particles act as a whole, and together with the larger SiC particles mixed in, the two types of particles play a hybrid reinforcement role. Compared with the traditional single-size and uniformly distributed SiC / Al composite material, its wear resistance and friction coefficient are further improved.

[0032] 3. This embodiment uses an aluminum alloy containing a large number of alloying elements, with Si being the most abundant. The large amount of Si can introduce a large number of wear-resistant single-crystal Si particles during alloy solidification, which can improve the wear resistance of the material. Cu and Mg elements added in a certain proportion can form reinforcing phases such as Al2Cu and Al2CuMg, which can increase the wear resistance of the material and increase the strength of the matrix alloy, ensuring that the brake disc has sufficient strength to ensure its safety.

[0033] 4. The aluminum alloy used in this embodiment contains a large amount of Si elements and some Cu and Mg elements. The introduction of alloying elements lowers the melting point of the alloy and improves its fluidity. In addition, the SiC / Al composite material processing debris is coated with aluminum alloy, and the SiC / Al composite material processing debris has good wettability with the aluminum alloy liquid. This reduces the temperature of the preform, the temperature of the impregnated aluminum alloy liquid, and the impregnation pressure during the pressure impregnation process, effectively preventing the occurrence of interfacial reactions, reducing the process difficulty, and ensuring the high density of the material.

[0034] 5. The process described in this embodiment is simple, easy to operate, does not require the use of environmentally harmful chemical reagents, and achieves efficient utilization of SiC / Al composite material debris. It is energy-saving, environmentally friendly, and low-cost, and is easy to realize large-scale industrial production and application.

[0035] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the particle size of the SiC / Al composite material processing debris in step one is 500μm~1000μm.

[0036] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 1 or 2 in that the volume fraction of SiC in the SiC / Al composite material processing debris described in step 1 is 30%~50%.

[0037] Specific Implementation Method Four: This implementation method differs from one of the specific implementation methods one to three in that the particle size of SiC in the SiC / Al composite material processing debris described in step one is 10μm~50μm.

[0038] Specific Implementation Method 5: This implementation method differs from one of the specific implementation methods one to four in that the mixing time using the powder mixer in step one is 5 min to 10 min.

[0039] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that: In step one, SiC / Al composite material processing debris and SiC particles are mixed using a powder mixer, and then loaded into a pressure impregnation mold. A pre-pressure of 50kN is applied using a press and held for 10 minutes. Then, the mold, along with the debris and SiC particles, is placed into a heating furnace, heated from room temperature to 540℃ and held for 10 minutes. After that, the debris and SiC particles are pressed to 50% of their original height using a press at 540℃ and held for 5 minutes. After that, the mixture is cooled to room temperature to obtain a SiC / Al composite material preform.

[0040] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that: In step one, SiC / Al composite material processing debris and SiC particles are mixed using a powder mixer, and then loaded into a pressure impregnation mold. A pre-pressure of 75kN is applied using a press and held for 15 minutes. Then, the mold, along with the debris and SiC particles, is placed into a heating furnace, heated from room temperature to 550℃ and held for 15 minutes. After that, the debris and SiC particles are pressed to 60% of their original height using a press at 550℃ and held for 10 minutes. After that, the mixture is cooled to room temperature to obtain a SiC / Al composite material preform.

[0041] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One to Seven in that: In step one, SiC / Al composite material processing debris and SiC particles are mixed using a powder mixer, and then loaded into a pressure impregnation mold. A pre-pressure of 100kN is applied using a press and held for 10 minutes. Then, the mold, along with the debris and SiC particles, is placed into a heating furnace, heated from room temperature to 560°C and held for 20 minutes. After that, the debris and SiC particles are pressed to 70% of their original height using a press at 560°C and held for 10 minutes. After that, the mixture is cooled to room temperature to obtain a SiC / Al composite material preform.

[0042] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One to Eight in that: the aluminum alloy described in step two is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 20.0%, the mass fraction of Mg is 1.0%, the mass ratio of Mg to Cu is 1:3, and Al is the balance.

[0043] Specific Implementation Method 10: This implementation method differs from Specific Implementation Methods 1 to 9 in that: the aluminum alloy described in step 2 is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 15.0%, the mass fraction of Mg is 2.0%, the mass ratio of Mg to Cu is 1:2.5, and Al is the balance.

[0044] Example 1

[0045] This embodiment describes a method for preparing high-volume-fraction, high-density SiC / Al composite materials using SiC / Al processing waste, which is carried out according to the following steps:

[0046] Step 1: Mix the SiC / Al composite material processing debris and SiC particles using a powder mixer, then load the mixture into a pressure impregnation mold. Apply a pre-pressure of 50kN using a press and hold the pressure for 10 minutes. Then, place the mold along with the debris and SiC particles into a heating furnace, raise the temperature from room temperature to 540℃ and hold for 10 minutes. After that, use a press at 540℃ to press the debris and SiC particles to 50% of their original height and hold the pressure for 5 minutes. Then, cool to room temperature to obtain the SiC / Al composite material preform.

[0047] The particle size of the SiC / Al composite material processing debris is 1000 μm;

[0048] The volume fraction of SiC in the SiC / Al composite material processing debris is 50%.

[0049] The particle size of SiC in the SiC / Al composite material processing debris is 50 μm;

[0050] The mixing time using the powder mixer is 5 minutes.

[0051] Step 2: Melt the aluminum alloy to obtain molten aluminum alloy;

[0052] The aluminum alloy is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 20.0%, the mass fraction of Mg is 1.0%, the mass ratio of Mg to Cu is 1:3, and Al is the balance.

[0053] Step 3: Heat the mold containing the SiC / Al composite material preform obtained in Step 1 from room temperature to 540℃ and keep it at that temperature for 10 minutes. Pour the molten aluminum alloy obtained in Step 2 into the mold containing the SiC / Al composite material preform and perform pressure impregnation.

[0054] The pressure impregnation process is as follows: a pressure of 10kN is applied using a press and held for 3 minutes to allow the aluminum alloy liquid to penetrate into the pores of the SiC / Al composite material preform.

[0055] Step 4: After the aluminum alloy liquid solidifies, place the mold and the prepared composite material directly in the air to cool. Finally, demold to obtain a high volume fraction, high density SiC / Al composite material.

[0056] Figure 1 These are macroscopic photographs of the SiC / Al composite material prepared in Example 1; Figure 2This is a metallographic image of the SiC / Al composite material prepared in Example 1. It can be seen that the SiC / Al composite material prepared in Example 1 has high density, approaching 100%, and is free of pores. Testing showed that the density of the high volume fraction, high density SiC / Al composite material prepared in Example 1 is 2.8731 g / cm³. 3 The material has a density of 98.8%, a Young's modulus of 121 GPa, a flexural strength of 276 MPa, and a Brinell hardness of 117 HBW.

[0057] Example 2

[0058] This embodiment describes a method for preparing high-volume-fraction, high-density SiC / Al composite materials using SiC / Al processing waste, which is carried out according to the following steps:

[0059] Step 1: Mix the SiC / Al composite material processing debris and SiC particles using a powder mixer, then load the mixture into a pressure impregnation mold. Apply a pre-pressure of 75kN using a press and hold the pressure for 15 minutes. Then, place the mold along with the debris and SiC particles into a heating furnace, raise the temperature from room temperature to 550℃ and hold for 15 minutes. After that, use a press at 550℃ to press the debris and SiC particles to 60% of their original height and hold the pressure for 10 minutes. Then, cool to room temperature to obtain the SiC / Al composite material preform.

[0060] The particle size of the SiC / Al composite material processing debris is 1000 μm;

[0061] The volume fraction of SiC in the SiC / Al composite material processing debris is 40%.

[0062] The particle size of SiC in the SiC / Al composite material processing debris is 30 μm;

[0063] The mixing time using the powder mixer is 10 minutes.

[0064] Step 2: Melt the aluminum alloy to obtain molten aluminum alloy;

[0065] The aluminum alloy is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 15.0%, the mass fraction of Mg is 2.0%, the mass ratio of Mg to Cu is 1:2.5, and Al is the balance.

[0066] Step 3: Heat the mold containing the SiC / Al composite material preform obtained in Step 1 from room temperature to 580℃ and hold it at that temperature for 15 minutes. Pour the molten aluminum alloy obtained in Step 2 into the mold containing the SiC / Al composite material preform and perform pressure impregnation.

[0067] The pressure impregnation process is as follows: a pressure of 20kN is applied using a press and held for 4 minutes to allow the aluminum alloy liquid to penetrate into the pores of the SiC / Al composite material preform.

[0068] Step 4: After the aluminum alloy liquid solidifies, place the mold and the prepared composite material directly in the air to cool. Finally, demold to obtain a high volume fraction, high density SiC / Al composite material.

[0069] After testing, the density of the high volume fraction, high density SiC / Al composite material obtained in Example 2 was 2.8873 g / cm³. 3 The material has a density of 99.1%, a Young's modulus of 127 GPa, a flexural strength of 279 MPa, and a Brinell hardness of 122 HBW.

[0070] Example 3

[0071] This embodiment describes a method for preparing high-volume-fraction, high-density SiC / Al composite materials using SiC / Al processing waste, which is carried out according to the following steps:

[0072] Step 1: Mix the SiC / Al composite material processing debris and SiC particles using a powder mixer, then load the mixture into a pressure impregnation mold. Apply a pre-pressure of 100kN using a press and hold the pressure for 10 minutes. Then, place the mold along with the debris and SiC particles into a heating furnace, raise the temperature from room temperature to 560℃ and hold for 20 minutes. After that, use a press at 560℃ to press the debris and SiC particles to 70% of their original height and hold the pressure for 10 minutes. Then, cool to room temperature to obtain the SiC / Al composite material preform.

[0073] The particle size of the SiC / Al composite material processing debris is 900 μm;

[0074] The volume fraction of SiC in the SiC / Al composite material processing debris is 30%.

[0075] The particle size of SiC in the SiC / Al composite material processing debris is 40 μm;

[0076] The mixing time using the powder mixer is 10 minutes.

[0077] Step 2: Melt the aluminum alloy to obtain molten aluminum alloy;

[0078] The aluminum alloy is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 10.0%, the mass fraction of Mg is 0.2%, the mass ratio of Mg to Cu is 1:4, and Al is the balance.

[0079] Step 3: Heat the mold containing the SiC / Al composite material preform obtained in Step 1 from room temperature to 600℃ and keep it at that temperature for 20 minutes. Pour the molten aluminum alloy obtained in Step 2 into the mold containing the SiC / Al composite material preform and perform pressure impregnation.

[0080] The pressure impregnation process is as follows: a pressure of 30kN is applied using a press and held for 5 minutes to allow the aluminum alloy liquid to penetrate into the pores of the SiC / Al composite material preform.

[0081] Step 4: After the aluminum alloy liquid solidifies, place the mold and the prepared composite material directly in the air to cool. Finally, demold to obtain a high volume fraction, high density SiC / Al composite material.

[0082] After testing, the density of the high volume fraction, high density SiC / Al composite material obtained in Example 3 was 2.9173 g / cm³. 3 The material has a density of 99.5%, a Young's modulus of 135 GPa, a flexural strength of 286 MPa, and a Brinell hardness of 129 HBW.

Claims

1. A method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste, characterized in that: The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste is carried out according to the following steps: Step 1: Mix the SiC / Al composite material processing debris and SiC particles using a powder mixer, then load the mixture into a pressure impregnation mold. Apply a pre-pressure of 50kN~100kN using a press and hold the pressure for 10min~20min. Then, place the mold along with the debris and SiC particles into a heating furnace and heat it from room temperature to 540℃~560℃ and hold the temperature for 10min~20min. After that, use a press at 540℃~560℃ to press the debris and SiC particles to 50%~70% of their original height and hold the pressure for 5min~10min. Then, cool it to room temperature to obtain the SiC / Al composite material preform. Step 2: Melt the aluminum alloy to obtain molten aluminum alloy; The aluminum alloy is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 10.0~20.0%, the mass fraction of Mg is 0.2~2.0%, the mass ratio of Mg to Cu is 1:2.5~4, and Al is the balance. Step 3: Heat the mold containing the SiC / Al composite material preform obtained in Step 1 from room temperature to 540℃~600℃ and hold it for 10min~20min. Pour the molten aluminum alloy obtained in Step 2 into the mold containing the SiC / Al composite material preform and perform pressure impregnation. The pressure impregnation process is as follows: a pressure of 10kN to 30kN is applied using a press and the pressure is maintained for 3 to 5 minutes, so that the aluminum alloy liquid impregnates into the pores of the SiC / Al composite material preform. Step 4: After the aluminum alloy liquid solidifies, place the mold and the prepared composite material directly in the air to cool. Finally, demold to obtain a high volume fraction, high density SiC / Al composite material.

2. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: The particle size of the SiC / Al composite material processing debris in step one is 500μm~1000μm.

3. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: The volume fraction of SiC in the SiC / Al composite material processing debris described in step one is 30%~50%.

4. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: The particle size of SiC in the SiC / Al composite material processing debris described in step one is 10μm~50μm.

5. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: The mixing time using the powder mixer described in step one is 5 min to 10 min.

6. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: Step 1: The SiC / Al composite material processing debris and SiC particles are mixed using a powder mixer and then placed into a pressure impregnation mold. A pre-pressure of 50 kN is applied using a press and held for 10 minutes. Then, the mold, along with the debris and SiC particles, is placed into a heating furnace. The temperature is raised from room temperature to 540°C and held for 10 minutes. After that, the debris and SiC particles are pressed to 50% of their original height using a press at 540°C and held for 5 minutes. Finally, the mixture is cooled to room temperature to obtain the SiC / Al composite material preform.

7. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: Step 1: The SiC / Al composite material processing debris and SiC particles are mixed using a powder mixer and then placed into a pressure impregnation mold. A pre-pressure of 75kN is applied using a press and held for 15 minutes. Then, the mold, along with the debris and SiC particles, is placed into a heating furnace and heated from room temperature to 550℃ and held for 15 minutes. After that, the debris and SiC particles are pressed to 60% of their original height using a press at 550℃ and held for 10 minutes. Finally, the mixture is cooled to room temperature to obtain the SiC / Al composite material preform.

8. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: Step 1: The SiC / Al composite material processing chips and SiC particles are mixed using a powder mixer and then placed into a pressure impregnation mold. A pre-pressure of 100kN is applied using a press and held for 10 minutes. Then, the mold, along with the chips and SiC particles, is placed into a heating furnace and heated from room temperature to 560℃ and held for 20 minutes. After that, the chips and SiC particles are pressed to 70% of their original height using a press at 560℃ and held for 10 minutes. Finally, the mixture is cooled to room temperature to obtain the SiC / Al composite material preform.

9. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: The aluminum alloy described in step two is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 20.0%, the mass fraction of Mg is 1.0%, the mass ratio of Mg to Cu is 1:3, and Al is the balance.

10. The method for preparing high volume fraction, high density SiC / Al composite materials using SiC / Al processing waste according to claim 1, characterized in that: The aluminum alloy described in step two is composed of Al, Si, Cu, and Mg, wherein the mass fraction of Si is 15.0%, the mass fraction of Mg is 2.0%, the mass ratio of Mg to Cu is 1:2.5, and Al is the balance.

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