A si c fiber reinforced aluminum prepreg tape and its production system and preparation method

Abstract

The application discloses a SiC fiber reinforced aluminum prepreg tape production system and a preparation method, and the production system comprises, in sequence along a fiber feeding direction of the SiC fiber, a fiber feeding device, a yarn separating device, a yarn spreading device, a preheating device, an aluminum coating device and a fiber collecting device; the fiber feeding device comprises a plurality of rotating shafts for loading SiC fiber coils and a tension control device arranged correspondingly behind each rotating shaft, and the SiC fiber in the SiC fiber coil is sent to the yarn separating device after the tension is adjusted by the tension control device. The production system can realize the preparation of a plurality of continuous SiC fiber reinforced aluminum prepreg tapes, can ensure the good infiltration and combination of the fiber and the matrix, can avoid the damage of a large area of the fiber, and can produce the prepreg tapes with a smooth surface, a regular cross section and uniform fiber distribution, and the prepreg tapes have the weaving property and can be used as raw materials to prepare SiC fiber reinforced aluminum matrix composite components by adopting a hot pressing method or an impregnation method.

Description

Technical Field

[0001] This invention relates to the field of fiber production equipment technology, and in particular to a production system and preparation method for SiC fiber reinforced aluminum preforms that can achieve continuous production of multiple bundles and ensure the quality of preform production, as well as the SiC fiber reinforced aluminum preforms obtained by the above-mentioned production system and preparation method. Background Technology

[0002] Ultrasonic-assisted aluminum-molten aluminum impregnation of silicon carbide pre-filaments is an innovative material synthesis method designed to solve the problem of effective impregnation of silicon carbide fibers with liquid aluminum in traditional processes. This technology utilizes the cavitation effect and micro-jet action of ultrasound to break down the physical barrier between the aluminum molten metal and silicon carbide fibers through energy waves generated by high-frequency vibrations. This rapidly increases the wetting angle, promoting the deep penetration of the aluminum molten metal into the silicon carbide fiber bundle within a short time. This process not only accelerates the impregnation process but also ensures the integrity of the silicon carbide fiber structure, avoiding the fiber strength loss that may result from prolonged high-temperature impregnation.

[0003] This technology is primarily applied in the field of high-end composite materials, particularly in aerospace, automotive manufacturing, and electronic packaging, where materials require both high strength and excellent high-temperature resistance. Composite materials prepared using ultrasonic aluminum-impregnated silicon carbide prefilament technology combine the lightweight and good electrical conductivity of aluminum with the high strength, high hardness, and excellent thermal stability of silicon carbide, enabling the design of high-performance, lightweight structural components. This technology offers advantages such as efficient impregnation, preservation of fiber strength, superior performance, and flexibility in composition design. However, existing SiC fiber-reinforced aluminum preform manufacturing equipment has the following shortcomings: 1. Pre-made ribbons can only be prepared using a single bundle of fibers, resulting in a small production volume per batch. When using multiple bundles of fibers, the fibers become entangled and intertwined, and the fibers are fixed on the take-up machine for take-up and untake-up. When using multiple bundles of fibers for testing, the fibers are prone to being out of sync, causing the fibers to clog the through-hole channels.

[0004] 2. Without tension control, fiber tension fluctuates significantly during the preparation process, making it impossible to maintain tension within a specific range. This prevents the fiber bundles from maintaining a consistent internal tightness, resulting in inconsistent fiber volume fraction and distribution in the pre-made ribbon.

[0005] 3. Once the support platform of the ultrasonic device is fixed, it is difficult to readjust the height and position of the ultrasonic device according to requirements during the preparation and debugging process.

[0006] 4. The fiber inlet and outlet holes on both sides of the aluminum melting furnace allow air to enter the furnace, making it impossible to form a sealed environment, and the surface of the molten aluminum is easily oxidized. Summary of the Invention

[0007] This invention provides a SiC fiber-reinforced aluminum preform production system and preparation method to solve the technical problems existing in the prior art mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows: A SiC fiber reinforced aluminum prefabricated tape production system includes a yarn feeding device, a yarn separating device, a yarn spreading device, a preheating device, an aluminum coating device, and a yarn taking device arranged sequentially along the SiC fiber movement direction; the yarn feeding device includes several rotating shafts for loading SiC fiber rolls and tension control devices correspondingly arranged after each rotating shaft, and the SiC fibers in the SiC fiber rolls are fed to the yarn separating device after the tension is adjusted by the tension control devices.

[0009] This invention first separates the fibers output from the unwinding device using a yarn separating device and a yarn spreading device, keeping the multiple fibers in a parallel state. This allows the fibers to pass through subsequent process sections side by side, avoiding the entanglement and cross-linking problems that easily occur when using multiple fiber bundles in existing production equipment. At the same time, this invention incorporates a tension control device in the unwinding device. Under a specific tension, the shaft of the unwinding device will actively rotate to unwind the fibers. On the one hand, by controlling the tension, the unwinding device and the winding device can work together to achieve synchronous unwinding and winding of each fiber bundle. On the other hand, the tension control device and the winding device avoid fiber tension fluctuations during the preparation process, ensuring the consistency of the tightness within the fiber bundle, thereby guaranteeing the quality indicators such as the volume fraction and distribution of the final prefabricated tape.

[0010] As a further preferred embodiment of the above technical solution, the tension control device is a set of tension rollers, and the tension control device is equipped with a tension sensor. The controllable tension range of the tension control device is 30~200CN.

[0011] As a further preferred embodiment of the above technical solution, the aluminum coating device includes a pit furnace, an ultrasonic generator, and a crucible installed inside the pit furnace; the ultrasonic generator is mounted directly above the crucible via a lifting platform, and the position and distance between the ultrasonic generator and the crucible are adjusted by the lifting platform. The ultrasonic generator head is located 5-25 mm directly above the fibers inside the crucible.

[0012] As a further preferred embodiment of the above technical solution, both the pit furnace and the crucible have fiber inlets and outlets on their sides, and these inlets and outlets are located on the same horizontal line. The fiber inlets and outlets of the pit furnace are equipped with airtight flanges, while the fiber inlets and outlets of the crucible are equipped with plugs. The fiber inlets and outlets are used to allow fibers to pass through; the airtight flanges ensure the isolation of the atmosphere inside and outside the pit furnace, preventing air from entering and causing oxidation of the molten aluminum. The fiber inlet of the pit furnace is connected to the outlet of the preheating device via the airtight flanges; the plugs prevent molten aluminum from flowing out. The pit furnace is also equipped with an inlet valve, an outlet valve, and a bellows. The ultrasonic generator extends into the molten aluminum in the crucible through the bellows, and inert gases such as nitrogen can be injected into the pit furnace through the inlet valves on both sides.

[0013] As a further preferred embodiment of the above technical solution, the plug at the fiber inlet of the crucible is cylindrical, with several through holes arranged side-by-side near the axis of the cylinder; the plug at the fiber outlet of the crucible is also cylindrical, with a flat square hole at the axis of the cylinder. The flat square hole gradually narrows in a funnel shape, serving to gather the fiber bundles. The plug is installed in conjunction with the crucible via threads or keyways, making replacement convenient. In addition to preventing the outflow of molten aluminum, the specially designed plug at the fiber outlet of the crucible can also achieve fiber bundling, allowing multiple fiber bundles to form a ribbon-like structure. The plug can be made of materials such as graphite, stainless steel, titanium alloy, and alumina.

[0014] As a further preferred embodiment of the above technical solution, a setting roller is also provided between the aluminum coating device and the take-up device; the setting roller includes a hot setting roller and a cold setting roller arranged sequentially. The hot setting roller is used to heat, extrude, and shape the pre-made ribbon, while the cold setting roller further shapes the pre-made ribbon and cools it. The combination of the hot setting roller and the cold setting roller improves the forming effect of the pre-made ribbon and prevents high temperature damage to the subsequent take-up device or burns to the operators.

[0015] Based on the same technical concept, the present invention also provides a method of using the above-mentioned SiC fiber reinforced aluminum preform production system, comprising the following operations: The fibers on the SiC fiber roll are fed to the yarn separating device through the yarn feeding device to be separated and kept parallel, and then sent to the preheating device through the yarn spreading device to be heated and degummed. The degummed fibers are sent to the aluminum coating device to pass through the aluminum liquid and be composited. Finally, they are collected by the yarn taking device to obtain the SiC fiber reinforced aluminum preform.

[0016] As a further preferred embodiment of the above technical solution, the fiber is processed by the aluminum coating device, then passes through the heat setting roller and the cold setting roller for flattening and shaping, and is then collected by the fiber take-up device; the temperature of the heat setting roller is 300~500℃, and the temperature of the cold setting roller is below 10℃.

[0017] As a further preferred embodiment of the above technical solution, the fibers are subjected to ultrasonic-assisted wetting during the aluminum coating process. During preparation, the ultrasonic generator head is immersed in the molten aluminum, connected to the ultrasonic power cord, and connected to ultrasonic cooling water and cooling gas. After the ultrasonic transmitter head has preheated for 5 minutes, the ultrasonic switch is turned on, and then the fiber take-up device is started.

[0018] As a further preferred embodiment of the above technical solution, the temperature of the molten aluminum in the aluminum coating device is 670~750℃. The temperature of the molten aluminum is measured periodically, and the wire drawing can be prepared when the temperature of the molten aluminum reaches the set temperature. The composition of the molten aluminum can be adjusted according to product needs, including but not limited to alloy components such as aluminum, magnesium, copper, and titanium.

[0019] As a further preferred embodiment of the above technical solution, the heating temperature of the fiber during the degumming process by the preheating device is 400~600℃.

[0020] As a further preferred embodiment of the above technical solution, the tension is set to 50~120CN during the preparation process and kept constant.

[0021] As a further preferred embodiment of the above technical solution, the winding speed of the winding device is 0.5~2m / min.

[0022] Based on the same technical concept, the present invention also provides a SiC fiber reinforced aluminum preform, which is prepared by the above-described production system or the above-described method for preparing SiC fiber reinforced aluminum preform.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a SiC fiber reinforced aluminum preform production system that ensures that multiple bundles of SiC fibers remain synchronous, parallel and continuous before entering the liquid metal pool, and achieves uniform speed traction. When the fibers pass through the liquid metal pool, an ultrasonic device is introduced to wet and bond the fibers with the aluminum metal matrix. Then, the fibers are bundled through the crucible plug hole to form a preform. The preform is then shaped and cooled using hot setting rollers and cold setting rollers, thereby realizing the preparation of multi-bundle continuous SiC fiber reinforced aluminum preforms.

[0024] The method for preparing SiC fiber-reinforced aluminum preforms provided by this invention can ensure good wetting and bonding between the fibers and the matrix, while avoiding large-area fiber damage. The preforms prepared have a smooth surface, regular cross-section, and uniform fiber distribution, and are weavable. They can be used as raw materials to prepare SiC fiber-reinforced aluminum matrix composite components through hot pressing, impregnation and other processes. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the SiC fiber-reinforced aluminum preform production system of Example 1; Figure 2 This is a schematic diagram of the SiC fiber-reinforced aluminum preform manufacturing equipment for Comparative Example 1. Figure 3 This is a photograph of the SiC fiber-reinforced aluminum preform of Example 1. Figure 4 This is a schematic diagram of the plug structure in Example 1; Figure 5 This is a schematic diagram (three-dimensional view) of the aluminum coating device in the SiC fiber-reinforced aluminum preform production system of Example 2. Figure 6 This is a schematic diagram of the aluminum coating device in the SiC fiber reinforced aluminum prefabricated tape production system of Example 2 (a cross-sectional view along the axis of the ultrasonic generator).

[0026] Legend: 1. Yarn feeding device; 1.1. Rotating shaft; 1.2. Tension sensor; 2. Yarn separating device; 3. Yarn spreading device; 4. Preheating device; 5. Airtight flange; 6. Air inlet valve; 7. Bellows; 8. Ultrasonic generator; 9. Lifting platform; 10. Crucible; 11. Molten aluminum; 12. Hole plug; 13. Air outlet valve; 14. Heat setting roller; 15. Cold setting roller; 16. Yarn take-up device; 17. Pit furnace; 21. Fixed bracket; 22. Furnace cover; 23. Impregnation furnace chamber; 25. Hot melting furnace chamber; 26. Aluminum ingot; 27. Plug; 28. Elevator; 29. ​​Longitudinal moving platform; 210. Lateral moving frame; d1. Yarn feeding device; d1.1. Tension sensor; d2. Preheating device; d3. Pit furnace; d4. Ultrasonic generator; d5. Synchronous belt conveyor; d6. Yarn take-up device. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] Example 1: like Figure 1 As shown, the SiC fiber-reinforced aluminum precast tape production system of this embodiment includes a yarn feeding device 1, a yarn separating device 2, a yarn spreading device 3 (spreading roller), a preheating device 4 (preheating tube furnace), an aluminum coating device, a heat setting roller 14, a cold setting roller 15, and a yarn taking-up device 16 arranged sequentially along the SiC fiber movement direction. The aluminum coating device includes a pit furnace 17, a crucible 10 disposed inside the pit furnace 17, and an ultrasonic generator 8. The ultrasonic generator 8 is vertically mounted on the pit furnace 17 via a lifting platform 9 (a corrugated pipe 7 is provided between the pit furnace 17 and the ultrasonic generator 8 to ensure the atmosphere inside the pit furnace 17), and the distance between the ultrasonic generator 8 and the crucible 10 can be adjusted. Fiber inlets and outlets are provided on the sides of both the pit furnace 17 and the crucible 10, and the fiber inlets and outlets of the pit furnace 17 and the crucible 10 are located on the same horizontal line. Airtight flanges 5 are provided at the fiber inlets and outlets of the pit furnace 17. Plugs 12 are provided at the fiber inlets and outlets of the crucible 10. The fiber inlet and outlet are used to accommodate the passage of fibers; the airtight flange 5 ensures the isolation of the atmosphere inside and outside the pit furnace 17, preventing air from entering and causing oxidation of the molten aluminum. The fiber inlet of the pit furnace 17 is connected to the outlet of the preheating device 4 through the airtight flange 5; the plug 12 prevents the molten aluminum from flowing out, such as... Figure 4 As shown ( Figure 4 On the left is the plug 12 at the fiber inlet of crucible 10. Figure 4 The right side shows the plug 12 at the fiber outlet of crucible 10. The plug 12 at the fiber inlet of crucible 10 is cylindrical, and several through holes are arranged side by side near the axis of the cylinder. The plug 12 at the fiber outlet of crucible 10 is also cylindrical, and a flat square hole is opened at the axis of the cylinder. The inlet area of ​​the flat square hole is larger than the outlet area. The pit furnace 17 is also equipped with an inlet valve 6, an outlet valve 13, and a bellows 7. The ultrasonic generator 8 extends into the molten aluminum in crucible 10 through the bellows 7. Inert gases such as nitrogen can be injected into the pit furnace 17 through the inlet valves 6 on both sides of the pit furnace 17. The wire feeding device 1 is equipped with multiple rotating shafts 1.1 and a tension control device (tension roller group with tension sensor 1.2). Under the control of tension, the rotating shafts 1.1 can actively feed the wire and cooperate with the wire take-up to achieve synchronous wire feeding and take-up.

[0030] The method for preparing multi-bundle SiC fiber-reinforced aluminum preforms using the SiC fiber-reinforced aluminum preform production apparatus of this embodiment is as follows: (1) Fiber preparation: Install the fiber roll on the rotating shaft 1.1 of the fiber feeding device 1, and pass the fiber through the yarn separating device 2 and the yarn spreading device 3 in sequence to ensure that there is no overlap between the yarn bundles. Then pass the fiber through the preheating device 4 in parallel. Then pass the fiber through the fiber inlet hole plug 12 of the crucible 10 (put in an aluminum ingot of appropriate size before plugging the side of the crucible 10), and then pass it through the fiber outlet hole plug 12 and put the hole plug 12 into the fiber outlet on the side of the crucible 10. Use a threader to thread the fiber to the fiber outlet of the well furnace 17 and pull the fiber to the take-up device 16 for fixation.

[0031] (2) Place the ultrasonic generator 8 on the lifting platform 9, adjust the height of the ultrasonic generator head of the ultrasonic generator 8 so that it is about 10 mm above the fiber in the crucible 10, mark the position, and then raise the platform so that the ultrasonic generator 8 leaves the furnace.

[0032] (3) Turn on the power to the fiber feeding device 1 and the fiber taking device 16 to straighten the fiber, and then adjust the position of the crucible 10 to ensure that the fiber inlet and outlet of the pit furnace 17 and the hole plug 12 are in a straight line. (4) Add 1.5 kg of 6061 aluminum alloy ingot to crucible 10 to ensure that the liquid level of aluminum liquid 11 is above the height of the fiber; (5) Turn on the nitrogen switch and the air inlet valves 6 on both sides of the pit furnace 17, turn on the air pump and open the air outlet valve 13; (6) Set the heating temperature of pit furnace 17 to 750℃ and the heating rate to 15℃ / min, and start the heating program of pit furnace 17. After reaching the set temperature, maintain the temperature for about 1 hour. Once the temperature of aluminum liquid 11 reaches the set temperature, the equipment can be started. (7) Adjust the tension of the pulled fiber at the take-up device 16, set the tension to 10N, keep the tension constant, insert the ultrasonic generator head of the ultrasonic generator 8 into the aluminum liquid 11, connect the ultrasonic power cord and the cooling system, preheat for 5 minutes, turn on the ultrasonic switch, set the take-up rate to 1m / min, and then start the take-up device 16 so that the fiber continuously passes through and is compounded in the aluminum liquid 11. (8) Set the temperature of the heat setting roller 14 to 480°C. After passing through two heat setting rollers 14 to flatten the strip, it is then cooled and set by the cold setting roller 15 and further flattened. The cold setting roller 15 is filled with circulating cooling water, and the water temperature is controlled below 10°C. Finally, the pre-made strip is wound up to obtain the finished product.

[0033] like Figure 3 As shown in Table 1, the performance test data of the multi-SiC fiber reinforced aluminum preform prepared in this embodiment are as follows: the diameter is uniform, the preparation continuity is good, the surface is smooth and burr-free, the fiber and the matrix are well bonded, and the fiber is not damaged over a large area during use.

[0034] Table 1. Tensile strength test data of the precast strip prepared in Example 1

[0035] Example 2: The SiC fiber-reinforced aluminum preform production system of this embodiment further improves the structure of the aluminum cladding device, especially the lifting platform and the pit furnace 17, based on Embodiment 1. The structure and connection relationship of other devices remain unchanged; specifically, as follows... Figure 5 and Figure 6 As shown ( Figure 6 (The cross-section of the transverse moving frame 210 is omitted in the text). The aluminum cladding device also includes a pit furnace 17, an ultrasonic generator 8, a lifting platform, and a crucible 10. The crucible 10 is installed inside the pit furnace 17. The ultrasonic generator 8 is installed on the pit furnace 17 via the lifting platform and extends into the pit furnace 17 (a corrugated pipe 7 is also provided between the pit furnace 17 and the ultrasonic generator 8 to ensure the atmosphere inside the pit furnace), and the distance between the ultrasonic generator 8 and the crucible 10 is adjusted via the lifting platform.

[0036] The lifting platform includes a fixed support 21, a horizontal moving platform, and a lift 28. The ultrasonic generator 8 is mounted on the lift 28 via the fixed support 21 and moves vertically with the lift 28. The lift 28 is mounted on the horizontal moving platform and moves horizontally with the horizontal moving platform to adjust the relative position of the ultrasonic generator 8 and the pit furnace 17. The horizontal moving platform includes a transverse moving frame 210 and a longitudinal moving stage 29. The lift 28 is mounted on the longitudinal moving stage 29 and moves along the X direction with the longitudinal moving stage 29. The longitudinal moving stage 29 is mounted on the transverse moving frame 210 and moves along the Y direction, which is on the same horizontal plane as the X direction and perpendicular to the X direction. The transverse moving frame 210 spans above the pit furnace 17 and can move via pulleys and rails. The longitudinal moving stage 29 can move by being embedded in a groove provided on the top of the transverse moving frame 210.

[0037] The pit furnace 17 is equipped with a hot-melting furnace chamber 25 and an impregnation furnace chamber 23. Each chamber has an independently controlled heating device. The hot-melting furnace chamber 25 has a discharge port, which is connected to the crucible 10 via a pipe. The discharge port of the hot-melting furnace chamber 25 is located at the bottom of the chamber and is higher than the top of the crucible 10. The discharge port of the hot-melting furnace chamber 25 is connected to the inlet of the impregnation furnace chamber 23 via a guide pipe. The guide pipe has a wide inlet and narrow outlet, and in this embodiment, the angle between the outlet end of the guide pipe and the horizontal plane is 15°. The top of the impregnation furnace chamber 23 is equipped with a furnace cover 22, which has a through hole for accommodating the ultrasonic generator 8. A removable plug 27 is installed in the discharge port of the hot-melting furnace chamber 25.

[0038] The SiC fiber-reinforced aluminum preform production system of this embodiment is basically the same as that of Embodiment 1 in use, except that it adds the multi-directional position adjustment operation of the ultrasonic generator 8 in the aluminum coating device, as well as the operation of heating the aluminum ingot 26 in the hot melting furnace chamber 25 and releasing the aluminum liquid 11 to the crucible 10 after the fiber is set.

[0039] The performance test data of the multi-SiC fiber reinforced aluminum preform obtained in this embodiment are shown in Table 2. It has a uniform diameter, good preparation continuity, smooth surface without burrs, good bonding between the fiber and the matrix, and no large-area damage during fiber use.

[0040] Table 2. Tensile strength test data of the precast strip prepared in Example 2

[0041] Comparative Example 1: The manufacturing equipment used in this comparative example is such as Figure 2 As shown, the preparation method is as follows: (1) Fix the prepared fiber roller onto the fiber feeding device d1.

[0042] (2) After the fiber passes around the tension sensor d1.1 pulley, the fiber passes through the preheating device d2, then through the left inlet of the pit furnace d3 and the crucible hole plug in sequence, and finally through the right outlet of the pit furnace d3.

[0043] (3) Straighten and fix the fiber on the d6 track of the take-up device and then adjust the position of the crucible to ensure that the inlet and outlet on both sides of the pit furnace d3 and the holes on both sides of the crucible are in a straight line.

[0044] (4) Adjust the height of the ultrasonic transmitter head of the ultrasonic generator d4 to be about 8 mm directly above the fiber. After the height of the ultrasonic transmitter head is adjusted, remove it and add 1 kg of aluminum ingots to the crucible to raise the aluminum liquid level to the height of the fiber.

[0045] (5) Turn on the nitrogen flow meter, set the maximum temperature to 750℃ and the heating rate to 15℃ / min, and start the d3 heating program of the pit furnace. After reaching the set temperature, maintain the temperature and measure the temperature of the molten aluminum at regular intervals. Maintain the temperature for about two hours. When the temperature of the molten aluminum reaches above the set temperature, draw the wire.

[0046] (6) Adjust the tension of the drawn fiber at the unwinding device d1, adjust the unwinding resistance, and keep the fiber tension stable within 50-100 CN. Insert the ultrasonic transmitter into the aluminum liquid, connect nitrogen for cooling, preheat for three minutes, turn on the ultrasonic switch, set the winding speed to 1 m / min, and then start the winding device d6 to make the fiber continuously pass through and combine in the aluminum liquid to obtain the pre-made fiber product.

[0047] In this comparative example, since there is only one fixed roller on the wire feeding machine, only one bundle of fiber-reinforced aluminum pre-filament can be used. The pre-filament has no burrs on its surface but is not smooth, has no luster, and has a nearly circular cross-sectional shape. The continuity is generally poor, and the amount of pre-filament prepared at one time is too small to achieve mass production.

[0048] Table 3. Tensile strength test data of the preforms prepared in Comparative Example 1

[0049] Comparative Example 2: The only difference between the production system in this comparative example and the embodiment is that this comparative example lacks a liftable platform. The distance between the ultrasonic transmitter and the fiber greatly affects the wetting of the fiber by the metal matrix throughout the entire preparation process. However, the height of the ultrasonic device in this comparative example is difficult to readjust after it is fixed, resulting in the fiber not being wetted by the metal matrix or only the outer surface being wetted while the internal fibers remain unchanged.

[0050] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of the present invention should also be considered within the protection scope of the present invention.

Claims

1. A production system for SiC fiber-reinforced aluminum preforms, characterized in that, The device includes a yarn feeding device (1), a yarn separating device (2), a yarn spreading device (3), a preheating device (4), an aluminum coating device, and a yarn taking device (16) arranged sequentially along the direction of SiC fiber feeding. The yarn feeding device (1) includes several rotating shafts (1.1) for loading fiber rolls and tension control devices correspondingly arranged after each rotating shaft (1.1). The SiC fibers in the fiber rolls are fed to the yarn separating device (2) after the tension is adjusted by the tension control device.

2. The production system for SiC fiber-reinforced aluminum preforms according to claim 1, characterized in that, The tension control device is a set of tension rollers, and the tension control device is equipped with a tension sensor (1.2).

3. The production system for SiC fiber-reinforced aluminum preforms according to claim 1, characterized in that, The aluminum coating device includes a pit furnace (17), an ultrasonic generator (8), and a crucible (10) installed inside the pit furnace (17). The ultrasonic generator (8) is installed directly above the crucible (10) via a lifting platform (9), and the position and distance between the ultrasonic generator (8) and the crucible (10) are adjusted via the lifting platform (9).

4. The production system for SiC fiber-reinforced aluminum preforms according to claim 3, characterized in that, The well furnace (17) and the crucible (10) are both provided with fiber inlets and fiber outlets on their sides, and the fiber inlets and fiber outlets of the well furnace (17) and the crucible (10) are located on the same horizontal line; the fiber inlets and fiber outlets of the well furnace (17) are provided with airtight flanges; the fiber inlets and fiber outlets of the crucible (10) are provided with plugs (12).

5. The production system for SiC fiber-reinforced aluminum preforms according to claim 3, characterized in that, The plug (12) at the fiber inlet of the crucible (10) is cylindrical, and several through holes are arranged in parallel near the axis of the cylinder; the plug (12) at the fiber outlet of the crucible (10) is also cylindrical, and a flat square hole is opened at the axis of the cylinder. The shape of the flat square hole gradually narrows in a trumpet shape, which plays the role of gathering the fiber bundles. The plug (12) is installed with the crucible (10) through threads or keyways.

6. The production system for SiC fiber-reinforced aluminum preforms according to any one of claims 1-5, characterized in that, A shaping roller is also provided between the aluminum coating device and the wire take-up device (16); the shaping roller includes a hot shaping roller (14) and a cold shaping roller (15) arranged in sequence.

7. A method for preparing SiC fiber-reinforced aluminum preforms, characterized in that, The SiC fiber-reinforced aluminum preform production system according to any one of claims 1-6 is implemented, comprising the following operations: The fibers on the SiC fiber roll are sent to the yarn separating device (2) through the yarn feeding device (1) for separation and parallelism, and then sent to the preheating device (4) through the yarn spreading device (3) for heating and degumming. The degummed fibers are sent to the aluminum coating device, so that the fibers pass through the aluminum liquid and are compounded. Finally, they are collected by the yarn taking device (16) to obtain the SiC fiber reinforced aluminum preform.

8. The method for preparing SiC fiber-reinforced aluminum preforms according to claim 7, characterized in that, After being processed by the aluminum coating device, the fibers are flattened by the heat setting roller (14) and the cold setting roller (15) and then collected by the take-up device (16). The temperature of the heat setting roller (14) is 300~500℃ and the temperature of the cold setting roller (15) is less than 10℃.

9. The method for preparing SiC fiber-reinforced aluminum preforms according to any one of claims 7-8, characterized in that, During the degumming process of the fiber in the preheating device (4), the heating temperature is 400~600℃.

10. A SiC fiber-reinforced aluminum prefabricated strip, characterized in that, It is prepared using the production system described in any one of claims 1-6 or the preparation method described in any one of claims 7-9.

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