A device and method for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber

Abstract

The present invention relates to a device and a method for using a carbon coating that is rapidly deposited on the surface of a continuous silicon carbide fiber. The device is designed for the first time on the basis of existing equipment to have a wire hanging device with wire hanging teeth, and before assembling it to an impregnation device, the wire hanging device processes the surface of the raw material continuous silicon carbide fiber, which can not only remove the surface hairs but also mechanically activate the surface, which provides the necessary conditions for obtaining a high-quality carbon layer later. The present invention relies on the designed continuous carbon coating production line, and does not require pre-corrosion treatment of the fiber surface. The continuous SiC fiber is first activated by the wire hanging device and then impregnated in an aqueous organic solution, and then dried and cracked and CVD are performed, so as to quickly form a firm carbon coating on the surface of the continuous SiC fiber. The device structure of the present invention is reasonably designed, the preparation process is simple and controllable, the obtained product has excellent performance, and is convenient for large-scale industrial application.

Description

Technical Field

[0001] The invention relates to a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber and a use method thereof. Background Art

[0002] Silicon carbide fiber has excellent high temperature resistance and oxidation resistance, good chemical corrosion resistance at both room temperature and high temperature, and high specific strength and specific modulus. Silicon carbide fiber has great application potential in high-tech fields such as aerospace, nuclear energy, etc.

[0003] High-strength continuous silicon carbide fibers can be used to reinforce SiC matrix to prepare ceramic matrix composites (abbreviated as SiC f / SiC CMCs, CMCs is the abbreviation of Ceramic Matrix Composites). SiC f / SiC ceramic matrix composites are very promising core component candidate materials in the fields of nuclear energy and aerospace. f SiC / SiC ceramic matrix composites can be manufactured by a variety of methods, such as polymer infiltration and pyrolysis (PIP), chemical vapor infiltration (CVI), melt infiltration / reaction sintering (MI / RS), nanoinfiltration and transient eutectic sintering (NITE), etc.

[0004] SiC f One of the bottleneck issues in the large-scale production of SiC ceramic matrix composites is the stable supply of SiC fibers with surface coatings of appropriate thickness. f / SiC ceramic matrix composites are brittle matrix composites whose mechanical behavior is determined by the fiber / matrix interface. Boron nitride (BN) and pyrolytic carbon (PyC) are SiC f BN is a commonly used material for the interface of SiC ceramic matrix composites. This is because both surface coatings have the characteristics of low friction and low shear modulus. Since BN has better oxidation resistance than PyC, SiC fibers with BN coating are usually used to prepare SiC in the aerospace field. f / SiC ceramic matrix composites, but this composite material is difficult to apply to nuclear energy, this is because 10 B has a high neutron cross section, will capture neutrons, and transmute into He. Carbon has excellent stability, resistance to neutron radiation and high temperature resistance in a non-oxidizing environment, so SiC fibers with pyrolytic carbon coating are most likely to be used in nuclear fusion and gas-cooled fast reactors.

[0005] CVI or chemical vapor deposition (CVD) is the method to prepare SiC f / SiC composites and the classic manufacturing method for preparing pyrolytic carbon coatings on SiC fibers. However, the biggest disadvantage of the traditional CVI / CVD method is that its processing time is extremely long, and because the traditional CVI / CVD is carried out in a closed furnace, the shape and size of the product are limited by the size of its chamber, and when continuous long fibers are stacked together for the fiber coating process, some problems will arise: such as cross-bonding between adjacent fiber bundles and twisting or bending deformation.

[0006] In addition, when using the CVI / CVD method to prepare a pyrolytic carbon coating on the surface of SiC fibers, it is often necessary to first chemically treat the fiber surface to improve the bonding of the pyrolytic carbon coating. For example, Chinese patents CN107810173A or CN104379538A both mention the use of chemical solutions containing hydrofluoric acid to treat the fiber surface to improve the bonding of the subsequent pyrolytic carbon coating. However, this method requires the use of highly toxic hydrofluoric acid, which is highly polluting, and is not convenient for treating continuous fibers, and it is not easy to ensure the consistency of the treatment effect. Summary of the invention

[0007] For large-scale production of silicon carbide fibers f In order to solve the bottleneck problem of SiC ceramic matrix composite materials, the present invention proposes a method for quickly depositing a carbon coating on the surface of continuous silicon carbide fibers for the first time and develops a device suitable for the method. The present invention takes continuous silicon carbide fibers as the processing object, introduces a first carbon source by impregnation without acid treatment, and then uses a second carbon source introduced during the deposition process, and through simultaneous cracking and vapor deposition, a continuous silicon carbide fiber with a carbon layer on the surface is quickly obtained.

[0008] The continuous silicon carbide fiber with a carbon layer on the surface obtained by the invention has good surface quality.

[0009] The present invention relies on the designed continuous carbon coating production line, and does not need to pre-corrode the fiber surface. The continuous SiC fiber is first treated by a wire hanging device and then immersed in an aqueous organic solution, and then dried and cracked and CVD are performed, so as to quickly form a firm carbon coating on the surface of the continuous SiC fiber.

[0010] The present invention provides a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber; the device comprises:

[0011] A wire-releasing device 1, a wire-hanging device 2, a first steering wheel 4, a second steering wheel 5, a third steering wheel 6, a fourth steering wheel 7, an impregnation device 8, at least one group of rollers 9 for homogenizing the impregnation liquid, a drying furnace 10, a continuous CVD furnace 11, and a winding device 12; when the device is working, the wire is sequentially passed through the wire-releasing device 1, the wire-hanging device 2, the first steering wheel 4, the second steering wheel 4, the third steering wheel 6, the fourth steering wheel 7, the rollers 9, the drying furnace 10, the continuous CVD furnace 11, and finally passed through the winding device 12 for winding; the second steering wheel 5 and the third steering wheel 6 are located in the impregnation device 8, the first steering wheel 4 and the fourth steering wheel 7 are located outside the impregnation device,

[0012] The wire hanging device is provided with a hole or a channel, and the aperture of the hole or the channel is 0.98 to 0.999 times the diameter of the wire released by the wire releasing device. When used for the first time, it can be achieved by means of thermal expansion and contraction, or by bolt tightening, or by pressurization when the upper and lower wheels are docked. In the present invention, the main function of the wire hanging device is to remove the hair on the surface of the continuous silicon carbide fiber and realize its mechanical activation. Of course, if microcracks can be generated on the surface, this is beneficial to the present invention. Microcracks of appropriate size and number are conducive to subsequent impregnation, and then to obtaining a high-quality carbon coating. At the same time, these microcracks on the surface are conducive to the formation of active silicon carbide during subsequent treatment, thereby improving the performance of the product.

[0013] When applied in industry, the wire hanging device and the first turning wheel are provided with a blowing device or a dust collecting device 3 arranged downward or obliquely downward for blowing air in the direction away from the impregnation device. Such arrangement can avoid the impurities removed from falling into the impregnation liquid.

[0014] When used in industry, the wire hanging device is a wire hanging roller with wire hanging teeth 18, and the wire hanging roller is composed of two rollers with wire hanging teeth, and the minimum spacing between the two rollers is 0.98 to 0.995 times. The wire hanging teeth can not only remove impurities on the surface of the silicon carbide fiber, but also leave scratches or activation areas on the surface of the silicon carbide fiber, which provides necessary conditions for the subsequent impregnation-deposition of high-quality carbon. The number of groups of the wire hanging rollers is preferably 1-3 groups. When the number of groups of the wire hanging rollers is greater than or equal to 2, the activation area on the silicon carbide fiber becomes adjustable. Moreover, the product obtained after this process can carry an amount of information that is doubled after weaving.

[0015] When used in engineering, the wire hanging roller 17 is connected to the transmission device 16, and the minimum distance between the two rollers is adjusted by the transmission device.

[0016] When used in industry, the wire hanging device is N groups of wire hanging tiles 20 with wire hanging teeth 18; one group of wire hanging tiles 20 is composed of two curved wire hanging tiles, and the curved wire hanging tiles are provided with wire hanging teeth 18 on the side facing the center of the circle; the two curved wire hanging tiles constituting a group of wire hanging tiles have wire hanging teeth 18 arranged opposite to each other, and the silicon carbide fiber passes through the N groups of wire hanging tiles and contacts at least one wire hanging tooth 18 in the N groups of wire hanging tiles; any one of the wire hanging tiles is connected to the transmission device, and when the transmission device is used, the spacing between the two wire hanging tiles constituting a group of wire hanging tiles is adjusted. After the adjustment, within a group of wire hanging tiles, the maximum spacing between the wire hanging teeth 18 located on different wire hanging tiles is 0.98-0.999 times the diameter of the silicon carbide fiber. Of course, the device of the present invention can also produce fibers that need to be impregnated + CVD deposited with pyrolytic carbon. During operation, only one set of wire hanging tiles is needed, and the maximum spacing of the wire hanging teeth 18 located on different wire hanging tiles is 0.98-0.999 times the diameter of the fiber to be impregnated or deposited. The N is a positive integer greater than or equal to 1.

[0017] The present invention discloses an application of a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber; the device comprises the following steps:

[0018] The continuous silicon carbide fiber is sequentially passed through a wire-releasing device 1, a wire-hanging device 2, a first steering wheel 4, a second steering wheel 5, a third steering wheel 6, a fourth steering wheel 7, an impregnation liquid homogenizing roller 9, a drying furnace 10, and a continuous CVD furnace 11, and finally wound through a winding device 12; the second steering wheel 5 and the third steering wheel 6 are located in an impregnation device 8, and the first steering wheel 4 and the fourth steering wheel 7 are located outside the impregnation device 8; wherein the impregnation device 8 is filled with an impregnation liquid, and the continuous silicon carbide fiber has an impregnation liquid on its surface after passing through the impregnation liquid, and the impregnation liquid contains an organic solute, and the organic solute is selected from at least one of phenolic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, polyurethane, and polyvinyl pyrrolidone.

[0019] The impregnation solution solvent used in the present invention is water, alcohol or amide. Water is most preferred. In the present invention, the concentration of the organic solute in the impregnation solution is 5-150 g / L, preferably 50 g / L.

[0020] The invention discloses an application of a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber; a wire unwinding device and a winding device realize continuous operation through synchronous rotation.

[0021] The invention discloses an application of a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber; the continuous silicon carbide fiber is in a tensile stress state between a wire-releasing device and the device.

[0022] The present invention discloses an application of a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber; the working temperature of the drying furnace is 80-280 degrees Celsius. When alcohols are used as solvents, a slightly lower drying temperature can be selected; when water or amides are used as solvents, a drying temperature of 120-280 degrees Celsius is selected, which is conducive to the rapid removal of water or amides.

[0023] The present invention discloses an application of a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber; the continuous CVD furnace is selected from a graphite furnace, a tubular furnace with a corundum tube or a quartz tube as a reaction chamber. A continuous cracking reaction occurs in the continuous CVD furnace. In the industrial application process; during operation, a carrier gas and a carbon source gas pass through the continuous CVD furnace, the carrier gas is selected from at least one of nitrogen, argon, helium, and an inert gas, preferably nitrogen; the carbon source gas is selected from at least one of saturated or unsaturated hydrocarbons such as methane, ethane, propane, acetylene, propylene, and propyne.

[0024] During operation, the temperature of the continuous CVD furnace is controlled at 1050-1550°C.

[0025] The invention discloses an application of a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber; the unwinding speed of the continuous silicon carbide fiber is 0.02-0.5 m / min.

[0026] The invention discloses an application of a device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber; the pulling force of the continuous silicon carbide fiber between the wire-releasing device and the device is 20-80 cN.

[0027] The wire unwinding machine and the winding machine of the present invention realize continuous operation through synchronous rotation. The impregnation device used is an impregnation tank with rollers. After the fiber is impregnated with the impregnation liquid, it is squeezed by a pair of rollers to remove excess impregnation liquid, and then dried by a drying furnace, and then passed through a continuous cracking CVD furnace. The continuous cracking CVD furnace adopts a horizontal furnace with air sealing devices at both ends. The fiber undergoes continuous cracking and CVD to achieve rapid deposition of a carbon coating on the surface. The thickness of the deposited carbon coating can be controlled by jointly controlling the speed of the silicon carbide fiber by the wire unwinding machine and the winding machine.

[0028] Principles and advantages

[0029] 1. The present invention designs a wire hanging device with wire hanging teeth for the first time, and assembles it before the impregnation device. The wire hanging device processes the surface of the raw material continuous silicon carbide fiber, which can not only remove impurities but also mechanically activate the surface, which provides the necessary conditions for obtaining a high-quality carbon layer later.

[0030] 2. The present invention is the first to design a wire hanging device with wire hanging teeth, so that the silicon carbide fiber produced has special infrared or wave absorbing characteristics. After it is woven together with the silicon carbide fiber with carbon layer produced by other equipment and prepared into equipment, it contains more information.

[0031] 3. The pyrolytic carbon coating formed by the impregnation pyrolysis CVD method has a good bonding effect with the SiC fiber and is not easy to peel off.

[0032] 4. The deposition thickness of pyrolytic carbon can be adjusted by adjusting the time of passing through the pyrolysis CVD furnace.

[0033] 5. This method can deposit the pyrolytic carbon coating under tension, making the obtained continuous fiber straighter, reducing adhesion and having better mechanical properties.

[0034] 6. The present method has lower cost advantages and higher efficiency in preparing continuous SiC fibers with deposited pyrolytic carbon coatings.

[0035] 7. After optimization, the fiber volume resistivity of the product is 0.11Ω·cm, and the tensile strength of the monofilament of the obtained product is 2.66GPa, and the elongation at break is 1.32%. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the continuous immersion pyrolysis CVD coating device used in Examples 1-4;

[0037] Figure 2 Based on Figure 1 Schematic diagram of the continuous immersion pyrolysis CVD coating device obtained through the extended design;

[0038] Figure 3 Schematic diagram of the continuous immersion pyrolysis CVD coating device used in Example 5;

[0039] Figure 4 for Figure 1 Enlarged view of the wire hanging equipment.

[0040] Figure 5 for Figure 3 Enlarged view of the wire hanging equipment.

[0041] Figure 6 for Figure 5 An enlarged schematic diagram of a group of hanging silk tiles.

[0042] Figure 7 This is a characterization diagram of the element content at different depths of the silicon carbide fiber with pyrolytic carbon coating obtained in Example 1.

[0043] In the figure: wire laying equipment 1, wire hanging equipment 2, dust suction device 3, first steering wheel 4, second steering wheel 5, third steering wheel 6, fourth steering wheel 7, impregnation device 8, roller 9, drying furnace 10, continuous CVD furnace 11, winding equipment 12, SiC fiber 13, carrier gas 14, reaction gas 15, transmission device 16, wire hanging roller 17, wire hanging teeth 18, transmission rod 19, wire hanging tile 20. DETAILED DESCRIPTION

[0044] The following examples are intended to further illustrate the contents of the present invention. It is necessary to point out that the following examples cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technical personnel skilled in the art based on the above contents of the present invention still fall within the scope of protection of the present invention.

[0045] The following are examples:

[0046] Wherein Examples 1-4 use Figure 1 The designed equipment (the wire hanging equipment used is a set of rollers, a set of wire hanging rollers is composed of two rollers with wire hanging teeth, the minimum spacing between the two rollers is 0.99 times, and a single wire hanging tooth is conical, its height is the diameter of the silicon carbide fiber, and the taper is 1), Example 5 uses Figure 3 The designed equipment (the wire hanging equipment used is a group of wire hanging tiles, which are composed of two curved wire hanging tiles, and the curved wire hanging tiles are provided with wire hanging teeth on the side facing the center of the circle; the two curved wire hanging tiles constituting a group of wire hanging tiles have wire hanging teeth 18 arranged opposite to each other, and the silicon carbide fiber passes through N groups of wire hanging tiles and contacts the wire hanging teeth; any one of the wire hanging tiles is connected to the transmission device, and when the transmission device is used, the spacing between the two wire hanging tiles constituting a group of wire hanging tiles is adjusted. After the adjustment, the maximum spacing between the wire hanging teeth located on different wire hanging tiles in a group of wire hanging tiles is 0.99 times the diameter of the silicon carbide fiber, and a single wire hanging tooth is conical, its height is the diameter of the silicon carbide fiber, and the taper is 1).

[0047] In an embodiment of the present invention, the raw material continuous silicon carbide fiber is sequentially passed through a wire-releasing device 1, a wire-hanging device 2, a first steering wheel 4, a second steering wheel 4, a third steering wheel 6, a fourth steering wheel 7, a roller 9, a drying furnace 10, a continuous CVD furnace 11, and finally wound by a winding device 12; the second steering wheel 5 and the third steering wheel 6 are located in an impregnation device 8, and the first steering wheel 4 and the fourth steering wheel 7 are located outside the impregnation device 8; wherein the impregnation device 8 is filled with an impregnation liquid.

[0048] Embodiment 1:

[0049] The continuous silicon carbide fiber (diameter of 13±2 microns) is placed on the wire-releasing machine, impregnated with water-based phenolic resin (the content of phenolic resin in the impregnation liquid is 30g / L), and the drying temperature is 250℃. When the temperature of the pyrolysis CVD furnace is below 1000℃, the fiber passes through the CVD deposition furnace with a deposition area length of 1.0m, and is fixed on the winder. The carrier gas is nitrogen, and the flow rate is controlled at 5L / min. The temperature of the CVD deposition furnace is raised to 1100℃, and the flow rate of the reaction gas methane is controlled at 3L / min. The wire-releasing machine and the winder are opened, and the fiber passes through the CVD deposition furnace at a speed of 0.1m / min. The thickness of the pyrolysis carbon on the surface of the deposited silicon carbide fiber is 60nm, and the volume resistivity of the fiber is 0.2Ω·cm (the time in the CVD furnace is 10min); the average tension of the continuous silicon carbide fiber between the wire-releasing device and the device is 60cN. The tensile strength of the monofilament of the obtained product is 2.31 GPa, and the elongation at break is 1.11%.

[0050] Embodiment 2:

[0051] The continuous silicon carbide fiber is placed on a wire-releasing machine (the continuous silicon carbide fiber is consistent with Example 1), impregnated with water-based phenolic resin (the content of phenolic resin in the impregnation liquid is 60g / L), and the drying temperature is 250°C. When the furnace temperature is below 1000°C, it passes through a CVD deposition furnace with a deposition area length of 1.5m, and is fixed on a winder. The carrier gas is nitrogen, and the flow rate is controlled at 5L / min. The temperature of the CVD deposition furnace is raised to 1300°C, the flow rate of the reaction gas ethylene is controlled at 5L / min, the wire-releasing machine and the winder are opened, and the fiber passes through the CVD deposition furnace at a speed of 0.1m / min. The thickness of the cracked carbon on the surface of the deposited silicon carbide fiber is 100nm, and the volume resistivity of the fiber is 0.12Ω·cm (the time in the CVD furnace is 15min). The average tension of the continuous silicon carbide fiber between the wire-releasing device and the device is 60cN. The tensile strength of the obtained product monofilament is 2.61GPa, and the elongation at break is 1.31%.

[0052] Embodiment 3:

[0053] The continuous silicon carbide fiber is placed on a wire-releasing machine (the continuous silicon carbide fiber is consistent with Example 1), impregnated with water-based phenolic resin (the content of phenolic resin in the impregnation liquid is 50g / L), and the drying temperature is 250°C. When the furnace temperature is below 1000°C, it passes through a CVD deposition furnace with a deposition area length of 1.2m, and is fixed on a winder. The carrier gas is argon, and the flow rate is controlled at 5L / min. The temperature of the CVD deposition furnace is raised to 1500°C, and the flow rate of the reaction gas acetylene is controlled at 3L / min. The wire-releasing machine and the winder are opened, and the fiber passes through the CVD deposition furnace at a speed of 0.1m / min. The thickness of the surface cracked carbon of the deposited silicon carbide fiber is 80nm, and the volume resistivity of the fiber is 0.15Ω·cm (the time in the CVD furnace is 12min). The average tension of the continuous silicon carbide fiber between the wire-releasing device and the device is 60cN. The tensile strength of the obtained product monofilament is 2.44GPa, and the elongation at break is 1.2%.

[0054] Embodiment 4:

[0055] The continuous silicon carbide fiber is placed on a wire-releasing machine (the continuous silicon carbide fiber is consistent with Example 1), impregnated with water-based phenolic resin (the content of phenolic resin in the impregnation liquid is 60g / L), and the drying temperature is 250°C. When the furnace temperature is below 1000°C, it passes through a CVD deposition furnace with a deposition area length of 2.0m, and is fixed on a winder. The carrier gas is nitrogen, and the flow rate is controlled at 5L / min. The temperature of the CVD deposition furnace is raised to 1100°C, and the flow rate of the reaction gas propylene is controlled at 3L / min. The wire-releasing machine and the winder are opened, and the fiber passes through the CVD deposition furnace at a speed of 0.1m / min. The thickness of the cracked carbon on the surface of the deposited silicon carbide fiber is 150nm, and the volume resistivity of the fiber is 0.1Ω·cm (time in the CVD furnace is 20min). The average tension of the continuous silicon carbide fiber between the wire-releasing device and the device is 60cN. The tensile strength of the obtained product monofilament is 2.37GPa, and the elongation at break is 1.18%.

[0056] Embodiment 5:

[0057] The continuous silicon carbide fiber is placed on a wire-releasing machine (the continuous silicon carbide fiber is consistent with Example 1), impregnated with water-based phenolic resin (the content of phenolic resin in the impregnation liquid is 60g / L), and the drying temperature is 250°C. When the furnace temperature is below 1000°C, it passes through a CVD deposition furnace with a deposition area length of 1.5m, and is fixed on a winder. The carrier gas is nitrogen, and the flow rate is controlled at 5L / min. The temperature of the CVD deposition furnace is raised to 1300°C, the flow rate of the reaction gas ethylene is controlled at 5L / min, the wire-releasing machine and the winder are opened, and the fiber passes through the CVD deposition furnace at a speed of 0.1m / min. The thickness of the surface cracked carbon of the deposited silicon carbide fiber is 100nm, and the volume resistivity of the fiber is 0.11Ω·cm (the time in the CVD furnace is 15min). The average tension of the continuous silicon carbide fiber between the wire-releasing device and the device is 60cN. The tensile strength of the obtained product monofilament is 2.66GPa, and the elongation at break is 1.32%.

[0058] Finally, it should be noted that the above embodiments are intended to illustrate that the present invention can be implemented or used by professionals in the field. The present invention includes but is not limited to the above embodiments. Any method, process, or product that complies with the claims or description of the specification and complies with the principles and novelty and creative features disclosed herein falls within the scope of protection of the present invention. Various similar changes can be made without violating the principles and claims of the present invention, and these changes all fall within the scope of protection of the present invention.

Claims

1. A device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber, characterized in that; The device comprises: A wire laying device (1), a wire hanging device (2), a first steering wheel (4), a second steering wheel (5), a third steering wheel (6), a fourth steering wheel (7), an impregnation device (8), at least one group of impregnation liquid homogenization rollers (9), a drying furnace (10), a continuous CVD furnace (11), and a winding device (12); when the device is in operation, the wire is sequentially passed through the wire laying device (1), the wire hanging device (2), the first steering wheel (4), the second steering wheel (5), the third steering wheel (6), the fourth steering wheel (7), the impregnation device (8), at least one group of impregnation liquid homogenization rollers (9), the drying furnace (10), the continuous CVD furnace (11), and finally passed through the winding device (12) for winding; the second steering wheel (5) and the third steering wheel (6) are located inside the impregnation device (8), and the first steering wheel (4) and the fourth steering wheel (7) are located outside the impregnation device. The wire hanging device is provided with a hole or a channel, and the aperture of the hole or the channel is 0.98 to 0.999 times the diameter of the wire released by the wire releasing device; The wire hanging device comprises N groups of wire hanging tiles (20) with wire hanging teeth (18); one group of wire hanging tiles (20) comprises two curved wire hanging tiles, and the curved wire hanging tiles are provided with wire hanging teeth (18) on the side facing the center of the circle; the two curved wire hanging tiles constituting one group of wire hanging tiles have their wire hanging teeth (18) arranged opposite to each other, and the silicon carbide fiber passes through the N groups of wire hanging tiles and contacts with at least one wire hanging tooth (18) in the N groups of wire hanging tiles; any one of the wire hanging tiles is connected to a transmission device, and under the action of the transmission device, the spacing between the two curved wire hanging tiles constituting one group of wire hanging tiles is adjusted, and after the adjustment, the maximum spacing between the wire hanging teeth (18) located on different wire hanging tiles in one group of wire hanging tiles is 0.98-0.999 times the diameter of the silicon carbide fiber.

2. The device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber according to claim 1, characterized in that: A blowing device for blowing air downward or obliquely downward in a direction away from the impregnation device or a dust collecting device (3) arranged downward or obliquely downward is provided between the wire hanging device (2) and the first steering wheel (4).

3. The device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber according to claim 1, characterized in that: The wire hanging device is a wire hanging roller (17) with wire hanging teeth (18), the wire hanging roller is composed of two rollers with wire hanging teeth, and the minimum spacing between the two rollers is 0.98 to 0.995 times; The number of groups of the wire hanging rollers is 1-3 groups; The wire hanging roller (17) is connected to the transmission device (16), and the minimum distance between the two rollers is adjusted by the transmission device (16).

4. An application of the device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber as claimed in any one of claims 1 to 3, characterized in that: The steps include: The continuous silicon carbide fiber is sequentially passed through a wire unwinding device (1), a wire hanging device (2), a first steering wheel (4), a second steering wheel (5), a third steering wheel (6), a fourth steering wheel (7), an impregnation liquid homogenizing roller (9), a drying furnace (10), and a continuous CVD furnace (11), and finally passed through a winding device (12) for winding; the second steering wheel (5) and the third steering wheel (6) are located in an impregnation device (8), and the first steering wheel (4) and the fourth steering wheel (7) are located outside the impregnation device (8); wherein the impregnation device (8) contains an impregnation liquid, and after passing through the impregnation liquid, the surface of the continuous silicon carbide fiber has the impregnation liquid, and the impregnation liquid contains an organic solute, and the organic solute is selected from at least one of phenolic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, polyurethane, and polyvinyl pyrrolidone.

5. The use of the device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber according to claim 4, characterized in that: The impregnation solution solvent used is water, alcohol or amide; the concentration of the organic solute in the impregnation solution is 5-150g / L; The wire unwinding device and the winding device realize continuous operation through synchronous rotation; The continuous silicon carbide fiber is in a tensile stress state between the unwinding device and the winding device.

6. The use of the device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber according to claim 4, characterized in that: The working temperature of the drying furnace is 80-280 degrees Celsius; when alcohol is used as the solvent, the drying temperature is selected to be 80-150 degrees Celsius, and when water or amide is used as the solvent, the drying temperature is selected to be 120-280 degrees Celsius; The continuous CVD furnace is selected from a graphite furnace, a tubular furnace with a corundum tube or a quartz tube as a reaction chamber; a continuous cracking reaction occurs in the continuous CVD furnace; when working, a carrier gas and a carbon source gas pass through the continuous CVD furnace, the carrier gas is selected from at least one of nitrogen, argon, and helium; the carbon source gas is selected from at least one of methane, ethane, propane, acetylene, propylene, and propyne; During operation, the temperature of the continuous CVD furnace is controlled at 1050-1550°C.

7. The use of the device for rapidly depositing a carbon coating on the surface of a continuous silicon carbide fiber according to claim 4, characterized in that: The unwinding speed of continuous silicon carbide fiber is 0.02~0.5m / min; The tension of the continuous silicon carbide fiber between the unwinding device and the winding device is 20-80 cN.

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