A carbon fiber metal matrix composite pre-treatment device and method

Abstract

The present application relates to a kind of carbon fiber metal matrix composite pretreatment device and method, comprising: spherical cylinder, stirring device is installed in spherical cylinder interior, cylindrical shell, motor, rotary drive mechanism, rotary drive assembly, inlet and outlet, rotary frame, rotary linkage mechanism, rotary linkage assembly, base.Spherical cylinder is set in the interior of cylindrical shell, ultrasonic transducer is arranged in spherical cylinder, check valve is arranged in the inlet of spherical cylinder, drive mechanism is driven by motor, when drive assembly rotates, stirring device starts, spherical cylinder is rotated along vertical direction by pulley, cylindrical shell is set on rotary frame and is connected with pulley, start motor, and cylindrical shell is connected with spherical cylinder along horizontal rotation, realize double-shaft all-around rotation.The present application has the advantages that: by mechanical rotation combined with ultrasonic vibration, avoid the performance reduction of composite material caused by carbon fiber being broken during mixing, and protect the plating layer from being damaged when mixing plated fiber.

Description

Technical Field

[0001] This invention belongs to the field of composite material pretreatment, and relates to a carbon fiber metal matrix composite material pretreatment device and method. Background Technology

[0002] Carbon fiber reinforced metal matrix composites have the characteristics of high specific strength, high specific modulus and low coefficient of thermal expansion, making them a composite material with great application potential.

[0003] Powder metallurgy is a process technology that produces metal powders or uses metal powders as raw materials, and then shapes and sinters to manufacture metal materials, composite materials, and various types of products. When using powder metallurgy to prepare carbon fiber reinforced metal matrix composites, the dispersion of carbon fibers in the powder directly affects the performance of the finished composite material. Poor dispersion can lead to problems such as pore defects or fiber agglomeration between the metal matrix and carbon fibers during the preparation process.

[0004] The ball milling method commonly used in existing pretreatment powder mixing processes can cause carbon fibers to break during the mixing process due to the impact of agate balls (or steel balls). This makes it difficult to control the length of carbon fibers in the composite material, and the irregular broken interfaces can cause unnecessary defects in subsequent processing. When mixing small amounts of powder with ball milling, it is difficult to control the number of large, medium, and small balls during the milling process, and the powder tends to settle at the bottom during the stirring process, resulting in uneven mixing. The ball milling time is long and the process is cumbersome. A large amount of powder sticks to the balls during the ball milling process, resulting in waste. Summary of the Invention

[0005] Purpose of the invention

[0006] To address the issues of carbon fiber breakage and uneven mixing in existing ball milling methods for mixing carbon fiber reinforced metal matrix composite powders, this invention provides a pretreatment device and method for carbon fiber reinforced metal matrix composites. By combining rotary mixing with ultrasonic vibration, the carbon fiber and metal powder are fully mixed during the powder mixing process, while protecting the carbon fiber from breakage. This improves the dispersibility of the carbon fiber and enhances the performance of the finished carbon fiber reinforced metal matrix composite.

[0007] Technical solution

[0008] A carbon fiber metal matrix composite pretreatment device includes a spherical cylinder, a shell, an ultrasonic generator, a frame, a first rotary drive mechanism, a second rotary drive mechanism, and a base.

[0009] The spherical cylinder is used to hold the samples that need to be mixed. The spherical cylinder is rotatably mounted inside the outer shell via a rotating shaft, with one end of the rotating shaft extending out of the outer shell.

[0010] The ultrasonic generator is fixedly mounted on the outer wall of the spherical cylinder, with the generating end of the ultrasonic generator facing the spherical cylinder;

[0011] The frame is mounted on the base;

[0012] The outer casing is rotatably mounted on the frame via a connecting shaft, with one end of the connecting shaft extending outside the frame;

[0013] The first rotary drive mechanism is mounted on the outer casing and is drivenly connected to one end of the connecting shaft extending outside the frame. As a further description of the above solution, the outer casing has an annular structure; the spherical cylinder has an internal accommodating space, and grooves are arrayed on the inner wall of the spherical cylinder, with a spacing of 1-2 mm between adjacent grooves. As a further description of the above solution, the first rotary drive mechanism includes a first servo motor, a first pulley, a second pulley, and a first transmission belt. The first servo motor is fixedly mounted on the outer casing by a bracket, and a second pulley is located at the output end of the first servo motor; the first pulley is located at the end of the rotating shaft extending outside the outer casing; the first pulley and the second pulley are connected by a first transmission belt.

[0014] The second rotary drive mechanism includes a second servo motor, a third pulley, a fourth pulley, and a second transmission belt.

[0015] The second servo motor is mounted on the frame, and a fourth pulley is provided at the output end of the second servo motor; the third pulley is located at the end of the connecting shaft that extends out of the frame; the third pulley and the fourth pulley are connected by a first transmission belt.

[0016] As a further description of the above scheme, two ultrasonic generators are provided, and the two ultrasonic generators are symmetrically arranged on the outer wall of the spherical cylinder; a counterweight is also provided on the outer shell, and the counterweight is symmetrically arranged on the outer shell with the first servo motor; a feed cover is provided at the feed inlet of the spherical cylinder, and a check valve is provided on the feed cover.

[0017] A pretreatment method using the above-mentioned carbon fiber metal matrix composite pretreatment apparatus includes the following steps:

[0018] Step 1: Place the metal powder and carbon fiber into the spherical cylinder;

[0019] Step 2: Use a vacuum pump to evacuate the inside of the spherical cylinder;

[0020] Step 3: Start the ultrasonic generator and adjust the ultrasonic frequency to make the metal powder and carbon fiber inside the spherical cylinder vibrate;

[0021] Step 4: Start the first rotary drive mechanism to mix the metal powder and carbon fiber mixture inside the spherical cylinder;

[0022] Step 5: Activate the second rotary drive mechanism to further mix the metal powder and carbon fiber inside the spherical cylinder;

[0023] Step 6: Adjust the output frequency of the first rotary drive mechanism and the second rotary drive mechanism to ensure thorough mixing; Step 7: After mixing is complete, open the feed cover and pour out the mixture of metal powder and carbon fiber;

[0024] Step 8: Place the mixed sample in a circular pressing mold and press it into a carbon fiber metal matrix composite preform under a pressure of 20 MPa.

[0025] As a further description of the above scheme, in step 1, metal powder with a thickness of 0.5 to 1 mm is first spread into the spherical cylinder, and then short-cut carbon fibers are evenly distributed on the powder surface. The thickness of the short-cut carbon fiber layer is within 0.5 mm. Then, the metal powder and short-cut carbon fibers are spread in sequence as described above. The length of the short-cut carbon fibers is 1 to 10 mm, and the particle size of the metal powder is 8 to 15 μm.

[0026] As a further description of the above scheme, in step 2, a vacuum pump is connected to a check valve to evacuate the inside of the spherical cylinder, so that the air pressure inside the spherical cylinder is 1-3 Pa. After maintaining the air pressure for 5-10 minutes, the check valve is closed.

[0027] As a further description of the above scheme, in step 3, the fixed ultrasonic frequency of the ultrasonic generator is started at 50-70kHz, and its vibration time is set to 2-4min. Then it stops for 30s and runs in a cycle according to the above vibration period for 0.5-2 hours until the powder mixing is completed.

[0028] As a further description of the above scheme, in step 6, the output frequency of the first servo motor is as follows: firstly, it accelerates uniformly from 0 r / min to 200 r / min within 30 seconds, then maintains a speed of 200 r / min for 30 seconds, then decelerates uniformly from 200 r / min to 0 r / min within 30 seconds and pauses for 30 seconds, and then repeats the above operation until the powder mixing is completed.

[0029] The second servo motor starts 15 seconds after the first servo motor. Its output frequency is as follows: first, it accelerates uniformly from 0 r / min to 200 r / min within 30 seconds, then maintains a speed of 200 r / min for 30 seconds, then decelerates uniformly from 200 r / min to 0 r / min within 30 seconds and pauses for 30 seconds, and then repeats the above operation until the powder mixing is completed. The total working time of the first and second servo motors is 0.5-2 hours.

[0030] As a further description of the above scheme, after the stirring is completed in step 7, the check valve is opened, and the mixture of metal powder and carbon fiber that has been stirred evenly is taken out. First, the feed cover is opened and the feed port is adjusted downward so that the powder that has been mixed in the spherical cylinder slides down. Then, the ultrasonic generator is started and the ultrasonic vibration is used at 40kHz for 10s so that the powder adhering to the inner wall of the spherical cylinder is shaken off by the ultrasonic vibration.

[0031] Advantages and effects

[0032] 1. This invention utilizes a variable frequency stirring method to ensure that the sample in a spherical cylinder without added steel shot is more thoroughly mixed under biaxial rotation stirring. The oxidation problem that may occur in the powder during the process is solved by vacuum mixing. After the chamber pressure decreases, the vibration caused by ultrasound propagates in the spherical cylinder, and the powder and carbon fiber adhering to the inner surface of the spherical cylinder can be effectively detached from the inner wall of the spherical cylinder under the ultrasonic field vibration, and complete the thorough mixing with the mechanical mixing.

[0033] 2. This invention uses a combination of mechanical rotation and ultrasonic vibration to mix the mixture within the spherical cylinder under the combined action of ultrasound and external rotation. The opposing ultrasonic field can adsorb small particles with a diameter range of around 10 μm at its ultrasonic interference position, causing some fine particles to shift to the destructive interference position. At the constructive interference position, the powder vibrates more intensely, and mixing occurs near the vibration. Combined with the inner wall grooves, since the groove spacing is close to the wavelength of the sound wave, it is easier to generate more obvious vibrations at the grooves. This process can promote uniform mixing, avoid the reduction of composite material performance caused by the breakage of carbon fibers during mixing, and protect the coating from damage when coated fibers are mixed.

[0034] 3. Compared with ball milling and stirring methods, this invention can protect the carbon fiber from being broken during the mixing process when mixing carbon fiber and matrix powder. When applied to pre-coated carbon fiber, it can effectively protect the coating from being knocked off during the mixing process. Under the vibration of the ultrasonic field, it can effectively promote the mixing of powder and carbon fiber, thereby improving the uniformity of the pre-made powder. Attached Figure Description

[0035] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0036] Figure 2 This is a front cross-sectional view of the present invention;

[0037] Figure 3 This is a schematic cross-sectional view of the spherical cylinder of the present invention;

[0038] Figure 4This is a top view of the cross-sectional structure of the spherical cylinder of the present invention.

[0039] Explanation of reference numerals in the attached drawings: 1-Spherical cylinder; 1a-Ultrasonic generator; 1b-Ultrasonic generator control circuit; 2-Outer shell; 3-First servo motor; 4-Bracket; 5-First rotary drive mechanism; 5a-First pulley; 5b-First transmission belt; 5c-Second pulley; 6-Second rotary drive mechanism; 6a-Third pulley; 6b-Second transmission belt; 6c-Fourth pulley; 7-Feed inlet; 7a-Check valve; 7b-Feed cover plate; 8-Frame; 9-Second servo motor; 10-Connecting shaft; 10a-First servo motor control line connection channel; 11-Base; 12-Counterweight. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] The components of the embodiments of the invention described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. A carbon fiber metal matrix composite pretreatment device includes a spherical cylinder 1, a shell 2, an ultrasonic generator 1a, a frame 8, a first rotary drive mechanism 5, a second rotary drive mechanism 6, and a base 11;

[0043] The spherical cylinder 1 is used to hold the sample to be mixed. The spherical cylinder 1 is rotatably mounted inside the outer shell 2 via a rotating shaft, with one end of the rotating shaft extending out of the outer shell 2. The ultrasonic generator 1a is fixedly mounted on the outer wall of the spherical cylinder 1, with the generating end of the ultrasonic generator 1a facing the spherical cylinder 1. The ultrasonic generator 1a is electrically connected to an external power supply via an ultrasonic source control circuit 1b. Specifically, the ultrasonic generator 1a is manufactured by Zhejiang Shenlai Ultrasonic Materials, model PZT4, with a radius of 25mm and a thickness of 3mm. The ultrasonic generating end is bonded and fixed to the spherical cylinder 1. The frame 8 is mounted on the base 11. The outer shell 2 is rotatably mounted on the frame 8 via a connecting shaft 10, with one end of the connecting shaft 10 extending out of the frame 8. The first rotary drive mechanism 5 is mounted on the outer shell 2 and is drivenly connected to the end of the connecting shaft 10 extending out of the frame 8. This invention utilizes a variable frequency stirring method to ensure that the sample in the spherical cylinder 1 without added steel shot is more thoroughly mixed under biaxial rotation stirring. The oxidation problem that may occur in the powder during the process is solved by vacuum mixing. After the chamber pressure is reduced, the vibration caused by ultrasound propagates in the spherical cylinder 1 and enables the powder and carbon fiber adhering to the inner surface of the spherical cylinder 1 to effectively detach from the inner wall under the ultrasonic field vibration, and complete the thorough mixing with the mechanical mixing.

[0044] The outer shell 2 of this invention has an annular structure; the spherical cylinder 1 has an internal space for receiving particles, and grooves are arrayed on the inner wall of the spherical cylinder 1, with a spacing of 1-2 mm between adjacent grooves. This design applies an ultrasonic field to the internal powder using ultrasonic generators 1a on both sides. The opposing ultrasonic field can adsorb small particles with a particle size range of around 10 μm at its ultrasonic interference position, causing some fine particles to shift to the destructive interference position. At the constructive interference position, the powder vibrates more intensely, and mixing occurs near the vibration location, combined with the inner wall grooves. Since the groove spacing is close to the wavelength of the sound wave, it is easier to generate more obvious vibrations at the grooves. This process promotes uniform mixing, avoids the reduction in composite material performance caused by the breakage of carbon fibers during mixing, and protects the coating from damage when mixed with coated fibers.

[0045] The first rotary drive mechanism 5 of the present invention includes a first servo motor 3, a first pulley 5a, a second pulley 5c, and a first transmission belt 5b. The first servo motor 3 is fixedly mounted on the outer casing 2 by a bracket 4. The first servo motor 3 is electrically connected to an external power supply through a first servo motor control line connection channel 10a, and a second pulley 5c is provided at the output end of the first servo motor 3. The first pulley 5a is located at one end of the rotating shaft that extends out of the outer casing 2. The first pulley 5a and the second pulley 5c are connected by the first transmission belt 5b.

[0046] The second rotary drive mechanism 6 includes a second servo motor 9, a third pulley 6a, a fourth pulley 6c, and a second transmission belt 6b. The second servo motor 9 is mounted on the frame 8, and the fourth pulley 6c is located at the output end of the second servo motor 9. The third pulley 6a is located at one end of the connecting shaft 10 that extends out of the frame 8. The third pulley 6a and the fourth pulley 6c are connected by a first transmission belt 5b.

[0047] The present invention comprises two ultrasonic generators, which are symmetrically arranged on the outer wall of the spherical cylinder 1. A counterweight 13 is also provided on the outer shell 2, and the counterweight 13 is symmetrically arranged on the outer shell 2 with the first servo motor 3. The feed inlet 7 of the spherical cylinder 1 is provided with a feed cover 7b, and a check valve 7a is provided on the feed cover 7b. For those skilled in the art, the control buttons controlling the operation of the second servo motor 9 and the first servo motor 3 via the control circuit, and the battery holder supplying power to them via the power supply circuit, are conventional technical means, and their principles will not be described in detail here.

[0048] A pretreatment method using the above-mentioned carbon fiber metal matrix composite pretreatment apparatus includes the following steps:

[0049] Step 1: Place the metal powder and carbon fiber into the spherical cylinder 1;

[0050] Step 2: Use a vacuum pump to evacuate the inside of the spherical cylinder;

[0051] Step 3: Start the ultrasonic generator and adjust the ultrasonic frequency to make the metal powder and carbon fiber inside the spherical cylinder 1 vibrate.

[0052] Step 4: Start the first rotary drive mechanism 5 to mix the metal powder and carbon fiber mixture inside the spherical cylinder 1;

[0053] Step 5: Activate the second rotary drive mechanism 6 to further mix the metal powder and carbon fiber inside the spherical cylinder 1;

[0054] Step 6: Adjust the output frequencies of the first rotary drive mechanism 5 and the second rotary drive mechanism 6 to make them fully mixed;

[0055] Step 7: After stirring is complete, open the feed cover 7b and pour out the mixture of metal powder and carbon fiber; Step 8: Place the mixed sample in a circular pressing mold and press it into a carbon fiber metal matrix composite preform under a pressure of 20 MPa. This invention enables more thorough mixing of the mixture in a spherical cylinder 1 without added steel shot, under biaxial rotation stirring. The oxidation problem that may occur in the powder during the process is solved by vacuum mixing. After the chamber pressure decreases, the ultrasonic vibration propagates in the spherical cylinder, causing the powder and carbon fiber adhering to the inner surface of the spherical cylinder 1 to detach from the inner wall of the spherical cylinder 1 under ultrasonic field vibration, and then achieve thorough mixing with mechanical mixing. Furthermore, this invention uses a combination of mechanical rotation and ultrasonic vibration to mix the mixture in the spherical cylinder 1 under the combined action of ultrasound and external rotation. The opposing ultrasonic field at its ultrasonic interference position can adsorb small particles with a particle size range of around 10 μm, making some... Under its influence, fine particles are displaced to positions where interference destructively occurs. At these positions, the powder vibrates more intensely, mixing occurs near the vibration points. Combined with the inner wall grooves, since the groove spacing is close to the wavelength of the sound wave, more pronounced vibrations are generated at the grooves. This process promotes uniform mixing, prevents the carbon fiber from being broken during mixing, thus avoiding a decrease in the composite material's performance. It also protects the coating from damage when mixed with coated fibers. Finally, this invention protects the carbon fiber from being broken during powder mixing and effectively protects the coating from being knocked off during powder mixing when applied to pre-coated carbon fibers. Under the vibration of the ultrasonic field, the mixing of powder and carbon fiber is effectively promoted, improving the uniformity of the pre-made powder.

[0056] In step 1 of this invention, firstly, a 0.5–1 mm thick layer of metal powder is spread into the spherical cylinder 1. Then, short-cut carbon fibers are evenly distributed onto the powder surface. The thickness of the short-cut carbon fiber layer is within 0.5 mm. This process of spreading metal powder and short-cut carbon fibers is repeated sequentially. This spreading method allows the carbon fibers and powder to be more evenly mixed under the action of the first rotary drive mechanism 5, the second rotary drive mechanism 6, and ultrasound. The short-cut carbon fibers have a length of 1–10 mm, and the metal powder has a particle size of 8–15 μm.

[0057] In step 2 of this invention, a vacuum pump is connected to the check valve 7a to evacuate the inside of the spherical cylinder 1, bringing the pressure inside the cylinder 1 to 1-3 Pa. This pressure is maintained for 5-10 minutes before the check valve 7a is closed. In step 3 of this invention, the ultrasonic generator is started at a fixed ultrasonic frequency of 50-70 kHz, and its vibration time is set to 2-4 minutes. It is then stopped for 30 seconds, and the above vibration cycle is repeated for 0.5-2 hours until powder mixing is complete.

[0058] In step 6 of this invention, the output frequency of the first servo motor 3 is as follows: firstly, it accelerates uniformly from 0 r / min to 200 r / min within 30 seconds, then maintains a speed of 200 r / min for 30 seconds, then decelerates uniformly from 200 r / min to 0 r / min within 30 seconds and pauses for 30 seconds, and then repeats the above operation until the powder mixing is completed; wherein the second servo motor 9 starts 15 seconds after the first servo motor 3 runs, and its output frequency is as follows: firstly, it accelerates uniformly from 0 r / min to 200 r / min within 30 seconds, then maintains a speed of 200 r / min for 30 seconds, then decelerates uniformly from 200 r / min to 0 r / min within 30 seconds and pauses for 30 seconds, and then repeats the above operation until the powder mixing is completed; wherein the total working time of the first servo motor 3 and the second servo motor 9 is 0.5-2 hours. In the first stage of this invention, mixing occurs on the operating plane of the first servo motor 3. Due to the density differences among the powders to be mixed, the mixing is more uniform during acceleration. In the second stage, the second servo motor 9 starts working, accelerating the mixing in the direction of its operation, and achieving an all-around powder mixing process under the drive of the first motor. In the third stage, the two motors operate at a uniform speed, and the addition of ultrasound during this process makes the mixing more uniform. In the fourth and fifth stages, the motors decelerate. Since the powder has a certain speed, a similar powder mixing effect as the acceleration process will be produced during deceleration. The ultrasonic field applied during this process can effectively cause the powder to detach from the inner wall of the spherical cylinder. Furthermore, since the groove spacing is close to the wavelength of the sound wave, it is easier to generate more obvious vibrations at the grooves. This process can promote the uniformity of mixing.

[0059] In step 7 of this invention, after stirring is completed, the check valve 7a is opened, and the mixture of metal powder and carbon fiber that has been stirred evenly is taken out. First, the feed cover plate 7b is opened, and the feed port is adjusted downward so that the powder that has been mixed in the spherical cylinder 1 slides down. Then, the ultrasonic generator 1a is started and ultrasonic vibration at 40 kHz is used for 10 seconds so that the powder adhering to the inner wall of the spherical cylinder 1 is shaken off by the ultrasonic vibration.

[0060] Example 1

[0061] Step 1: When using, first open the cover of the feed port 7. During the process of adding the sample into the spherical cylinder 1, carbon fiber and copper powder with a particle size of 10μm should be layered and spread inside the spherical cylinder 1. The length of the carbon fiber is limited to 1-10mm and it has undergone chemical copper plating treatment. Then close the feed port 7 of the spherical cylinder 1.

[0062] Step 2: Use a vacuum pump to evacuate the inside of the spherical cylinder 1. Use a vacuum pump to evacuate the inside of the spherical cylinder 1 to a pressure of 3 Pa, and maintain this pressure for 5 minutes before closing the check valve 7a.

[0063] Step 3: Start the ultrasonic generator and adjust the appropriate power and frequency to vibrate the sample inside the spherical cylinder 1. Start the ultrasonic generator, fix the ultrasonic frequency at 50kHz to ultrasonically vibrate the powder inside the spherical cylinder 1, and set the vibration and stop time to 2 minutes of vibration followed by 30 seconds of stop. Repeat the above vibration cycle for 0.5-2 hours until the powder mixing is complete.

[0064] Step 4: Adjust the first rotary drive mechanism 5 to start working. The output end of the first servo motor 3 drives the second pulley 5c to rotate. The second pulley 5c drives the second pulley 5a to rotate through the transmission belt 5b. The second pulley 5a drives the spherical cylinder 1 to rotate 360° vertically inside the cylindrical shell 2. During the rotation, the stirring device also disperses the sample in the spherical cylinder 1.

[0065] Step 5: Start the second servo motor 9. The output of the second servo motor 9 drives the fourth pulley 6c to rotate. The fourth pulley 6c drives the third pulley 6a to rotate through the transmission belt 6b. The third pulley 6a drives the connecting shaft 10 to rotate. One end of the connecting shaft 10 is connected to the outer shell 2, and the other end of the connecting shaft 10 is rotatably connected to the frame 8 through a bearing. At this time, the outer shell 2 and the spherical cylinder 1 achieve a 360° horizontal rotation, and the spherical cylinder achieves a 720° rotation.

[0066] Step 6: Adjust the output frequency of the two servo motors to ensure thorough mixing of the sample. Start the first servo motor 3 and set its rotation cycle as follows: starting from second 0, accelerate uniformly from 0 r / min to 200 r / min; starting from second 30, maintain a speed of 200 r / min for 30 seconds; starting from second 60, decelerate uniformly from 200 r / min to 0 r / min; starting from second 90, pause for 30 seconds, and repeat the above steps until mixing is complete. Start the second servo motor 9 and set its rotation cycle as follows: starting from second 0, pause for 15 seconds; starting from second 15, accelerate uniformly from 0 r / min to 200 r / min; starting from second 45, maintain a speed of 200 r / min for 30 seconds; starting from second 75, decelerate uniformly from 200 r / min to 0 r / min; starting from second 105, pause for 15 seconds, and repeat the above steps until mixing is complete. The total mixing time is 2 hours.

[0067] Step 7: After stirring is complete, open the feed cover 7b and pour out the sample. After the device stops running, open the check valve 7a, invert the feed port, and use vibration to remove the well-stirred sample. During the removal process, use ultrasound to vibrate at 40kHz, vibrating for 10 seconds, stopping for 10 seconds, and then restarting in a cycle to shake off the powder adhering to the inner wall of the spherical cylinder 1 under the vibration of ultrasound.

[0068] Step 8: Place the mixed sample in a circular pressing mold and press it into a carbon fiber copper matrix composite preform under a pressure of 20 MPa.

[0069] Example 2

[0070] Step 1: When using, first open the cover of the feed port 7. During the process of adding the sample into the spherical cylinder 1, carbon fiber and aluminum powder with a particle size of 8μm should be layered and spread inside the spherical cylinder 1. The length of the carbon fiber is limited to 2-8mm, and it has undergone chemical nickel plating treatment. Then close the feed port 7 of the spherical cylinder 1.

[0071] Step 2: Use a vacuum pump to evacuate the inside of the spherical cylinder 1. Use a vacuum pump to evacuate the inside of the spherical cylinder 1 to a pressure of 0.1 Pa, and maintain this pressure for 5 minutes before closing the check valve 7a.

[0072] Step 3: Start the ultrasonic generator and adjust the appropriate power and frequency to vibrate the sample inside the spherical cylinder 1. Start the ultrasonic generator, fix the ultrasonic frequency at 50kHz to ultrasonically vibrate the powder inside the spherical cylinder 1, and set the vibration and stop time to 3 minutes of vibration followed by 30 seconds of stop. Repeat this cycle until the powder mixing is complete.

[0073] Step 4: Adjust the first rotary drive mechanism 5 to start working. The output end of the first servo motor 3 drives the second pulley 5c to rotate. The second pulley 5c drives the second pulley 5a to rotate through the transmission belt 5b. The second pulley 5a drives the spherical cylinder 1 to rotate 360° vertically inside the cylindrical shell 2. During the rotation, the stirring device also disperses the sample in the spherical cylinder 1.

[0074] Step 5: Start the second servo motor 9. The output of the second servo motor 9 drives the fourth pulley 6c to rotate. The fourth pulley 6c drives the third pulley 6a to rotate through the transmission belt 6b. The third pulley 6a drives the connecting shaft 10 to rotate. One end of the connecting shaft 10 is connected to the outer shell 2, and the other end of the connecting shaft 11 is rotatably connected to the frame 8 through a bearing. At this time, the outer shell 2 and the spherical cylinder 1 achieve a 360° horizontal rotation, and the spherical cylinder achieves a 720° rotation.

[0075] Step 6: Adjust the output frequency of the two servo motors to ensure thorough mixing of the sample. Start the first servo motor 3 and set its rotation cycle as follows: starting from second 0, accelerate uniformly from 0 r / min to 200 r / min; starting from second 30, maintain a speed of 200 r / min for 30 seconds; starting from second 60, decelerate uniformly from 200 r / min to 0 r / min; starting from second 90, pause for 30 seconds, and repeat the above process until mixing is complete. Start the second servo motor 9 and set its rotation cycle as follows: starting from second 0, pause for 15 seconds; starting from second 15, accelerate uniformly from 0 r / min to 200 r / min; starting from second 45, maintain a speed of 200 r / min for 30 seconds; starting from second 75, decelerate uniformly from 200 r / min to 0 r / min; starting from second 105, pause for 15 seconds, and repeat the above process until mixing is complete. The total mixing time is 1 hour.

[0076] Step 7: After stirring is complete, open the feed cover 7b and pour out the sample. After the device stops running, open the check valve 7a, invert the feed port, and use vibration to remove the well-stirred sample. During the removal process, use ultrasound at 40kHz, vibrating for 10 seconds, stopping for 10 seconds, and then cycling to shake off the powder adhering to the inner wall of the spherical cylinder.

[0077] Step 8: Place the mixed sample in a circular pressing mold and press it into a carbon fiber aluminum matrix composite preform under a pressure of 20 MPa.

[0078] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pretreatment method using a carbon fiber metal matrix composite pretreatment device, characterized in that, The carbon fiber metal matrix composite pretreatment device includes a spherical cylinder (1), a shell (2), an ultrasonic generator (1a), a frame (8), a first rotary drive mechanism (5), a second rotary drive mechanism (6), and a base (11). The spherical cylinder (1) is used to hold the sample to be mixed. The spherical cylinder (1) is rotatably disposed inside the outer shell (2) via a rotating shaft, and one end of the rotating shaft extends out of the outer shell (2). The ultrasonic generator (1a) is fixedly mounted on the outer wall of the spherical cylinder (1), with the generating end of the ultrasonic generator (1a) facing the spherical cylinder (1). The frame (8) is mounted on the base (11); The outer casing (2) is rotatably mounted on the frame (8) via a connecting shaft (10), one end of which extends out of the frame (8); The first rotary drive mechanism (5) is mounted on the outer shell (2) and is driven to one end of the connecting shaft (10) extending out of the frame (8); the feed inlet (7) of the spherical cylinder (1) is provided with a feed cover plate (7b), and a check valve (7a) is provided on the feed cover plate (7b); The preprocessing method includes the following steps: Step 1: Place metal powder and carbon fiber into a spherical cylinder (1). In Step 1, first spread 0.5~1mm thick metal powder into the spherical cylinder (1), and then evenly spread short carbon fiber on the powder surface. The thickness of the short carbon fiber layer is within 0.5mm. Then repeat the above steps to lay metal powder and short carbon fiber in sequence. The length of the short carbon fiber is 1~10mm and the particle size of the metal powder is 8~15μm. Step 2: Use a vacuum pump to evacuate the inside of the spherical cylinder. In step 2, the vacuum pump is connected to the check valve (7a) and the inside of the spherical cylinder (1) is evacuated to make the air pressure inside the spherical cylinder (1) 1~3Pa. After maintaining the air pressure for 5~10 minutes, the check valve (7a) is closed. Step 3: Start the ultrasonic generator and adjust the ultrasonic frequency to make the metal powder and carbon fiber inside the spherical cylinder (1) vibrate. The fixed ultrasonic frequency of the ultrasonic generator in Step 3 is 50~70kHz, and its vibration time is set to 2~4min. Then stop for 30s and run in the above vibration cycle for 0.5~2 hours until the powder mixing is completed. Step 4: Start the first rotary drive mechanism (5) to mix the metal powder and carbon fiber mixture inside the spherical cylinder (1); Step 5: Activate the second rotary drive mechanism (6) to further mix the metal powder and carbon fiber inside the spherical cylinder (1); Step 6: Adjust the output frequency of the first rotary drive mechanism (5) and the second rotary drive mechanism (6) to mix them thoroughly. In step 6, the output frequency of the first servo motor (3) is as follows: First, it accelerates uniformly from 0 r / min to 200 r / min within 30 seconds, then maintains the speed of 200 r / min for 30 seconds, then decelerates uniformly from 200 r / min to 0 r / min within 30 seconds and pauses for 30 seconds. Then, the above work is repeated until the powder mixing is finished. The second servo motor (9) starts 15 seconds after the first servo motor (3) runs. Its output frequency is as follows: first, it accelerates uniformly from 0 r / min to 200 r / min within 30 seconds, then maintains a speed of 200 r / min for 30 seconds, then decelerates uniformly from 200 r / min to 0 r / min within 30 seconds and pauses for 30 seconds, and then repeats the above work until the powder mixing is finished; the total working time of the first servo motor (3) and the second servo motor (9) is 0.5-2 hours. Step 7: After the stirring is finished, open the feed cover (7b) and pour out the mixture of metal powder and carbon fiber. After the stirring is finished in Step 7, open the check valve (7a) and take out the uniformly stirred mixture of metal powder and carbon fiber. First, open the feed cover (7b) and adjust the feed port downward so that the powder that has been mixed in the spherical cylinder (1) slides down. Then, start the ultrasonic generator (1a) and use ultrasound to vibrate at 40kHz for 10s so that the powder adhering to the inner wall of the spherical cylinder (1) is shaken off by the ultrasonic vibration. Step 8: Place the mixed sample in a circular pressing mold and press it into a carbon fiber metal matrix composite preform under a pressure of 20 MPa.

2. The pretreatment method according to claim 1, characterized in that: The outer shell (2) has an annular structure; the spherical cylinder (1) has an internal space for receiving, and grooves are arranged in an array on the inner wall of the spherical cylinder (1), with the spacing between adjacent grooves being 1-2 mm.

3. The pretreatment method according to claim 2, characterized in that: The first rotary drive mechanism (5) includes a first servo motor (3), a first pulley (5a), a second pulley (5c), and a first transmission belt (5b). The first servo motor (3) is fixedly mounted on the housing (2) by a bracket (4), and a second pulley (5c) is provided at the output end of the first servo motor (3). The first pulley (5a) is located at one end of the rotating shaft that extends out of the housing (2). The first pulley (5a) and the second pulley (5c) are connected by the first transmission belt (5b). The second rotary drive mechanism (6) includes a second servo motor (9), a third pulley (6a), a fourth pulley (6c), and a second transmission belt (6b). The second servo motor (9) is mounted on the frame (8), and a fourth pulley (6c) is provided at the output end of the second servo motor (9); the third pulley (6a) is located at one end of the connecting shaft (10) extending out of the frame (8); the third pulley (6a) and the fourth pulley (6c) are connected by a first transmission belt (5b).

4. The pretreatment method according to claim 3, characterized in that: Two ultrasonic generators are provided, and the two ultrasonic generators are symmetrically arranged on the outer wall of the spherical cylinder (1); a counterweight (12) is also provided on the outer shell (2), and the counterweight (12) and the first servo motor (3) are symmetrically arranged on the outer shell (2).

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