Annealing heat cylinder device and preparation method thereof

Abstract

The application discloses an annealing heating cylinder device and a preparation method thereof. The annealing heating cylinder device comprises a cylinder structure with one end being open and the other end being closed, the cylinder structure comprises a core layer, a first winding layer and a second winding layer, the core layer is a carbon fiber unidirectional cloth, the first winding layer and the second winding layer are alternately included in the core layer, the preparation material of the first winding layer is a carbon fiber net tire, and the preparation material of the second winding layer is a long carbon fiber. The annealing heating cylinder device can reduce the temperature gradient difference and other problems caused by induction heating, so that the annealing furnace obtains a stable and uniform heat field, the thermal stress of the silicon carbide crystal is reduced, the yield is increased, and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of materials technology, and in particular to a heating cylinder device for annealing and its preparation method. Background Technology

[0002] Currently, silicon carbide annealing processes generally employ induction heating. This involves passing medium-to-high frequency alternating current through the induction coil of a heating cylinder, which inductively heats the crystal to be annealed within the crucible. A stable and uniform thermal field within the crucible is crucial. However, due to the limitations of traditional heating cylinder structures, maintaining a uniform and stable thermal field within the crucible is difficult. Furthermore, traditional heating cylinder structures can only anneal 1-3 crystals at a time, resulting in low annealing efficiency. Additionally, traditional heating cylinders use graphite heating cylinders, which offer excellent electrical and thermal conductivity. However, their drawbacks are also significant. The thermal conductivity of graphite heating cylinders decreases with increasing temperature. When the furnace operates at high temperatures, and the graphite heating cylinder has a thick wall and large volume, the large temperature difference between the surface and the center of the heating cylinder leads to substantial thermal stress, causing cracking. Moreover, prolonged operation at high temperatures increases the volatilization rate of the graphite heating cylinder, reducing its lifespan and decreasing its mechanical strength. Summary of the Invention

[0003] Based on this, and addressing the following problems with traditional graphite annealing heating cylinders: 1. Uneven temperature field during heating results in higher temperatures in the middle than at the ends, easily leading to greater thermal stress and cracking; 2. High evaporation rate, reduced mechanical strength, and short service life; 3. Small usable area of ​​the heat field generated by the graphite annealing heating cylinder and low single-pass annealing efficiency. An embodiment of this invention provides an annealing heating cylinder device. This annealing heating cylinder device can reduce the temperature gradient differences caused by induction heating, enabling the annealing furnace to obtain a stable and uniform heat field, reducing the thermal stress on silicon carbide crystals, increasing production output, and thus reducing costs.

[0004] An annealing heating cylinder device includes a cylindrical structure that is open at one end and closed at the other end. The cylindrical structure includes a core layer, a first winding layer and a second winding layer. The core layer is made of unidirectional carbon fiber fabric. The first winding layer and the second winding layer are alternately included in the core layer. The first winding layer is made of carbon fiber mesh, and the second winding layer is made of long carbon fiber.

[0005] In some embodiments, the carbon fiber mesh on the first winding layer has a uniform density.

[0006] In some embodiments, the density of long carbon fibers in the first winding layer near the open end of the cylindrical structure and near the closed end of the cylindrical structure are both greater than the density of long carbon fibers in the middle region of the first winding layer between the open end and the closed end.

[0007] In some embodiments, the angle between the long carbon fibers on the first winding layer near the opening end and the radial surface is 0 to 45°;

[0008] And / or, the angle between the long carbon fiber near the closed end on the first winding layer and the radial surface is 0 to 45°;

[0009] And / or, the angle between the long carbon fiber located in the intermediate region of the first winding layer and the radial plane is 45° to 90°.

[0010] In some embodiments, the annealing heating cylinder device further includes a coating deposited on the surface of the cylindrical structure by chemical vapor deposition.

[0011] Another object of the present invention is to provide a method for preparing a heating cylinder device for annealing.

[0012] A method for preparing the heating cylinder device for annealing includes the following steps:

[0013] Step 1: Wrap carbon fiber unidirectional fabric around the outer layer of the mold to form a core layer;

[0014] Step 2: Wrap a carbon fiber mesh around the outer surface of the core layer to form the first winding layer;

[0015] Step 3: Wrap long carbon fibers around the outer surface of the first winding layer to form a second winding layer;

[0016] Step 4: Wrap the first winding layer around the outer surface of the second winding layer;

[0017] Step 5: Repeat steps 3 and 4 several times to obtain the carbon fiber preform;

[0018] Step 6: Process the carbon fiber preform to obtain a cylindrical structure with one end open and the other end closed; and

[0019] Step 7: Graphitize the cylindrical structure.

[0020] In some embodiments, the following step is included after step 6 and before step 7: depositing pyrolytic carbon on the cylindrical structure using chemical vapor deposition.

[0021] In some embodiments, the method further includes the following step 8: machining the graphitized cylindrical structure to achieve a preset standard size; and purifying the machined cylindrical structure.

[0022] In some embodiments, the graphitization process is carried out at a temperature of 1800°C to 2400°C for a time of 2 to 10 hours.

[0023] In some embodiments, when long carbon fibers are wound around the outer surface of the first winding layer to form a second winding layer, the following steps are specifically included:

[0024] The long carbon fiber winding spacing is distributed according to the following rules: the long carbon fiber winding spacing near the open end of the cylindrical structure and the long carbon fiber winding spacing near the closed end of the cylindrical structure are both 0, and the long carbon fiber spacing in the middle region between the open end and the closed end is 3 to 6 mm.

[0025] And / or, the angle between the long carbon fiber near the opening end on the first winding layer and the radial surface is 0 to 45°;

[0026] And / or, the angle between the long carbon fiber near the closed end on the first winding layer and the radial surface is 0 to 45°;

[0027] And / or, the angle between the long carbon fiber located in the intermediate region of the first winding layer and the radial plane is 45° to 90°.

[0028] The aforementioned heating cylinder device for annealing can reduce the temperature gradient differences caused by induction heating, enabling the annealing furnace to obtain a stable and uniform thermal field, reducing the thermal stress of silicon carbide crystals, increasing production, and thus reducing costs.

[0029] The above-mentioned heating cylinder device for annealing, wherein the angle between the long carbon fiber near the open end of the first winding layer and the radial plane is 0-45°; the angle between the long carbon fiber near the closed end of the first winding layer and the radial plane is 0-45°; and the angle between the long carbon fiber in the middle region of the first winding layer and the radial plane is 45°-90°, can achieve the following beneficial effects: in the induction heating magnetic field, the smaller the angle between the fiber bundle and the horizontal plane, the longer the effective length of the fiber bundle per unit length cutting the magnetic field lines, and the higher the heating efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0032] Figure 1 This is a cross-sectional schematic diagram of an annealing heating cylinder device according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures

[0034] 10. Heating cylinder device for annealing; 101. Open end; 102. Closed end; 103. Intermediate region. Detailed Implementation

[0035] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0041] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] This application provides a heating cylinder device 10 for annealing to solve the following problems existing in traditional graphite annealing heating cylinders: uneven temperature field caused during heating, resulting in higher temperatures in the middle position than at both ends, which easily generates large thermal stress and causes cracking; high evaporation rate, reduced mechanical strength and short service life; small usable area of ​​the heat field generated by the graphite annealing heating cylinder and low single annealing efficiency. The following description will be provided in conjunction with the accompanying drawings.

[0044] The annealing heating cylinder device 10 provided in this application embodiment is exemplary; please refer to [link to example]. Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the annealing heating cylinder device 10 provided in an embodiment of this application. The annealing heating cylinder device 10 of this application can be used in silicon carbide annealing processes.

[0045] To more clearly illustrate the structure of the annealing heating cylinder device 10, the annealing heating cylinder device 10 will be described below in conjunction with the accompanying drawings.

[0046] For example, please refer to Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the annealing heating cylinder device 10 provided in an embodiment of this application. The annealing heating cylinder device 10 includes a cylindrical structure with one end open and the other end closed. Specifically, the cylindrical structure includes an open end 101, a closed end 102, and an intermediate region 103 located between the open end 101 and the closed end 102. The length of the open end 101 and the length of the closed end 102 can be set as needed. For example, in a specific example, the lengths of the open end 101, the closed end 102, and the intermediate region 103 between the open end 101 and the closed end 102 are equal. The cylindrical structure includes a core layer, a first winding layer, and a second winding layer.

[0047] The core layer is made of unidirectional carbon fiber fabric. A first winding layer and a second winding layer alternate within the core layer. The first winding layer is made of carbon fiber mesh. The second winding layer is made of long carbon fibers. There can be multiple first winding layers and multiple second winding layers, with multiple first winding layers and multiple second winding layers alternating. Adjacent first winding layers and second winding layers are interconnected.

[0048] The annealing heating cylinder device 10 of this embodiment is made of carbon / carbon composite material (carbon fiber mesh, long carbon fiber). During the heating process, the anisotropy of the annealing heating cylinder device 10 counteracts the temperature gradient of induction heating, forming a wider uniform temperature field region in the height direction of the thermal field, thereby achieving uniform and stable temperature in the annealing furnace during the silicon carbide annealing process.

[0049] In some embodiments, the carbon fiber mesh on the first winding layer has a uniform density. That is, the carbon fiber mesh on the first winding layer is evenly distributed, and there are no gaps between each turn of the carbon fiber mesh during winding, ensuring that the carbon fiber mesh density is uniform throughout the first winding layer.

[0050] In some embodiments, the density of long carbon fibers in the first winding layer near the open end 101 of the cylindrical structure and near the closed end 102 of the cylindrical structure are both greater than the density of long carbon fibers in the intermediate region 103 of the first winding layer located between the open end 101 and the closed end 102. See also Figure 1 As shown in the diagram, in this invention, the cylindrical structure is divided into a middle low-density section and upper and lower high-density sections. The cylindrical structure is made of long fibers and carbon fiber mesh. The difference lies in the following: in the middle low-density section, the density of the carbon fiber mesh is increased, as well as the gaps between fibers during long fiber winding; in the upper and lower high-density sections, the carbon fiber mesh content is lower than in the middle low-density section, and the gaps between fibers during long fiber winding are smaller, resulting in higher density.

[0051] In some embodiments, the long carbon fibers on the first winding layer near the open end 101 form an angle of 0 to 45° with the radial surface.

[0052] In some embodiments, the long carbon fibers on the first winding layer near the closed end 102 form an angle of 0 to 45° with the radial surface.

[0053] In some embodiments, the long carbon fibers located in the middle region 103 of the first winding layer form an angle of 45° to 90° with the radial plane.

[0054] In some embodiments, the annealing heating cylinder device 10 further includes a coating that is deposited on the surface of the cylindrical structure by chemical vapor deposition.

[0055] Another object of the present invention is to provide a method for preparing the heating cylinder device 10 for annealing.

[0056] A method for preparing a heating cylinder device 10 for annealing includes the following steps:

[0057] Step 1: Wrap carbon fiber unidirectional cloth around the outer layer of the mold to form a core layer.

[0058] Step 2: Wrap carbon fiber mesh around the outer surface of the core layer to form the first winding layer.

[0059] Step 3: Wrap long carbon fibers around the outer surface of the first winding layer to form a second winding layer.

[0060] Step 4: Wrap the first winding layer around the outer surface of the second winding layer.

[0061] Step 5: Repeat steps 3 and 4 several times to obtain the carbon fiber preform.

[0062] Step 6: Process the carbon fiber preform to obtain a cylindrical structure with one end open and the other end closed.

[0063] as well as

[0064] Step 7: Graphitize the cylindrical structure.

[0065] In some embodiments, the following step is included after step 6 and before step 7: depositing pyrolytic carbon on the cylindrical structure using chemical vapor deposition.

[0066] In some embodiments, the process further includes step 8: machining the graphitized cylindrical structure to achieve a preset standard size; and purifying the machined cylindrical structure. The purification process involves placing the machined cylindrical structure in a vacuum furnace at a temperature of 1600℃-1800℃, a pressure of 3-10 mbar, and introducing Ar gas at a rate of 50-200 ml / min for 2-10 hours.

[0067] In some embodiments, the graphitization process is carried out at a temperature of 1800°C to 2400°C for a time of 2 to 10 hours.

[0068] In some embodiments, when long carbon fibers are wound around the outer surface of the first winding layer to form the second winding layer, the following steps are specifically included:

[0069] The long carbon fiber winding spacing is distributed according to the following rules: the long carbon fiber winding spacing near the open end 101 of the cylindrical structure and the long carbon fiber winding spacing near the closed end 102 of the cylindrical structure are both 0, and the long carbon fiber spacing in the middle region 103 between the open end 101 and the closed end 102 is 3 to 6 mm.

[0070] And / or, the angle between the long carbon fiber near the opening end 101 on the first winding layer and the radial surface is 0 to 45°;

[0071] And / or, the angle between the long carbon fiber near the closed end 102 on the first winding layer and the radial surface is 0 to 45°;

[0072] And / or, the angle between the long carbon fibers in the middle region 103 of the first winding layer and the radial plane is 45° to 90°. The annealing heating cylinder device 10 described above, with the long carbon fibers near the open end 101 of the first winding layer having an angle of 0 to 45° with the radial plane; the long carbon fibers near the closed end 102 of the first winding layer having an angle of 0 to 45° with the radial plane; and the long carbon fibers in the middle region 103 of the first winding layer having an angle of 45° to 90° with the radial plane, achieves the following beneficial effects: in the induction heating magnetic field, the smaller the angle between the fiber bundle and the horizontal plane, the longer the effective length of the fiber bundle per unit length cutting the magnetic field lines, and the higher the heating efficiency.

[0073] When the above-mentioned annealing heating cylinder device 10 is used, its relationship with other components is as follows: The main function of the annealing heating cylinder device 10 is to replace the heating cylinder in the prior art. After replacement, it can change the heat field distribution in the furnace, changing the heat field from a state where the temperature is high in the middle and low at both ends to a state where the temperature is uniform. It is used in conjunction with the original heat field insulation structure.

[0074] Example 1

[0075] This embodiment provides a method for preparing a heating cylinder device 10 for annealing.

[0076] The method for preparing the heating cylinder device 10 for annealing includes the following steps:

[0077] Step 1: Wrap carbon fiber unidirectional cloth around the outer layer of the mold to form a core layer.

[0078] Step 2: Wrap carbon fiber mesh around the outer surface of the core layer to form the first winding layer.

[0079] Step 3: Wrap long carbon fibers around the outer surface of the first winding layer to form a second winding layer. The long carbon fiber winding spacing is distributed according to the following rules: the long carbon fiber winding spacing near the open end 101 of the cylindrical structure and the long carbon fiber winding spacing near the closed end 102 of the cylindrical structure are both 0, and the long carbon fiber spacing in the middle region 103 between the open end 101 and the closed end 102 is 3mm.

[0080] Step 4: Wrap the first winding layer around the outer surface of the second winding layer. The long carbon fibers on the first winding layer near the open end 101 have an angle of 45° with the radial plane; the long carbon fibers on the first winding layer near the closed end 102 have an angle of 45° with the radial plane; the long carbon fibers on the first winding layer located in the middle region 103 have an angle of 60° with the radial plane.

[0081] Step 5: Repeat steps 3 and 4 several times to obtain the carbon fiber preform.

[0082] Step 6: Process the carbon fiber preform to obtain a cylindrical structure with one end open and the other end closed.

[0083] Step 7: Deposit pyrolytic carbon onto the cylindrical structure using chemical vapor deposition;

[0084] Step 8: Graphitize the deposited cylindrical structure. The graphitization temperature is 1800℃ and the time is 10 hours.

[0085] Step 9: Machining the graphitized cylindrical structure to achieve the preset standard dimensions;

[0086] Step 10: Purify the machined cylindrical structure.

[0087] Example 2

[0088] This embodiment provides a method for preparing a heating cylinder device 10 for annealing.

[0089] The method for preparing the heating cylinder device 10 for annealing includes the following steps:

[0090] Step 1: Wrap carbon fiber unidirectional cloth around the outer layer of the mold to form a core layer.

[0091] Step 2: Wrap carbon fiber mesh around the outer surface of the core layer to form the first winding layer.

[0092] Step 3: Wrap long carbon fibers around the outer surface of the first winding layer to form a second winding layer. The long carbon fiber winding spacing is distributed according to the following rules: the long carbon fiber winding spacing near the open end 101 of the cylindrical structure and the long carbon fiber winding spacing near the closed end 102 of the cylindrical structure are both 0, and the long carbon fiber spacing in the middle region 103 between the open end 101 and the closed end 102 is 6mm.

[0093] Step 4: Wrap the first winding layer around the outer surface of the second winding layer. The long carbon fibers on the first winding layer near the open end 101 have an angle of 45° with the radial plane; the long carbon fibers on the first winding layer near the closed end 102 have an angle of 45° with the radial plane; the long carbon fibers on the first winding layer located in the middle region 103 have an angle of 60° with the radial plane.

[0094] Step 5: Repeat steps 3 and 4 several times to obtain the carbon fiber preform.

[0095] Step 6: Process the carbon fiber preform to obtain a cylindrical structure with one end open and the other end closed.

[0096] Step 7: Deposit pyrolytic carbon onto the cylindrical structure using chemical vapor deposition;

[0097] Step 8: Graphitize the deposited cylindrical structure. The graphitization temperature is 2400℃ and the time is 2 hours.

[0098] Step 9: Machining the graphitized cylindrical structure to achieve the preset standard dimensions;

[0099] Step 10: Purify the machined cylindrical structure.

[0100] Example 3

[0101] This embodiment provides a method for preparing a heating cylinder device 10 for annealing.

[0102] The method for preparing the heating cylinder device 10 for annealing includes the following steps:

[0103] Step 1: Wrap carbon fiber unidirectional cloth around the outer layer of the mold to form a core layer.

[0104] Step 2: Wrap carbon fiber mesh around the outer surface of the core layer to form the first winding layer.

[0105] Step 3: Wrap long carbon fibers around the outer surface of the first winding layer to form a second winding layer. The long carbon fiber winding spacing is distributed according to the following rules: the long carbon fiber winding spacing near the open end 101 of the cylindrical structure and the long carbon fiber winding spacing near the closed end 102 of the cylindrical structure are both 0, and the long carbon fiber spacing in the middle region 103 between the open end 101 and the closed end 102 is 5mm.

[0106] Step 4: Wrap the first winding layer around the outer surface of the second winding layer. The long carbon fibers on the first winding layer near the open end 101 have an angle of 30° with the radial plane; the long carbon fibers on the first winding layer near the closed end 102 have an angle of 30° with the radial plane; the long carbon fibers on the first winding layer located in the middle region 103 have an angle of 45° with the radial plane.

[0107] Step 5: Repeat steps 3 and 4 several times to obtain the carbon fiber preform.

[0108] Step 6: Process the carbon fiber preform to obtain a cylindrical structure with one end open and the other end closed.

[0109] Step 7: Deposit pyrolytic carbon onto the cylindrical structure using chemical vapor deposition;

[0110] Step 8: Graphitize the deposited cylindrical structure. The graphitization temperature is 2000℃ and the time is 6 hours.

[0111] Step 9: Machining the graphitized cylindrical structure to achieve the preset standard dimensions;

[0112] Step 10: Purify the machined cylindrical structure.

[0113] Compared with Example 2, Example 1 has the same carbon fiber winding angle, a smaller spacing in the middle region 103, a larger stable temperature field range, and higher production capacity. However, the graphitization temperature is low, which may cause uncontrollable deformation of the product during use and affect subsequent use.

[0114] Compared with Example 3, Example 1 has a smaller spacing in the middle region 103, a larger angle between the carbon fiber and the horizontal plane, a larger range of stable temperature field, and higher production capacity. However, the graphitization temperature is lower, which will cause uncontrollable deformation during use and affect subsequent use. Because the angle is larger than that in Example 3, the thermal efficiency of Example 1 will be lower than that in Example 3, and the energy consumption will be higher.

[0115] Compared with Example 3, Example 2 has a slightly larger spacing in the middle region 103, a slightly larger angle between the carbon fiber and the horizontal plane, a smaller range of stable temperature field, and lower production capacity, but a higher graphitization temperature and better stability. Because the angle is larger than that in Example 3, the thermal efficiency of Example 2 is lower than that in Example 3, and the energy consumption is higher.

[0116] In summary, the heating cylinder device 10 for annealing described above can reduce the temperature gradient differences caused by induction heating, enabling the annealing furnace to obtain a stable and uniform thermal field, reducing the thermal stress of silicon carbide crystals, increasing production, and thus reducing costs.

[0117] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0119] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A heating cylinder device for annealing, characterized in that, The device includes a cylindrical structure open at one end and closed at the other end. The cylindrical structure comprises a core layer, a first winding layer, and a second winding layer. The core layer is made of unidirectional carbon fiber fabric. The first winding layer and the second winding layer are alternately included in the core layer. The first winding layer is made of carbon fiber mesh, and the second winding layer is made of long carbon fibers. The long carbon fiber winding spacing is distributed according to the following rules: the winding spacing of the long carbon fibers near the open end of the cylindrical structure and the winding spacing of the long carbon fibers near the closed end of the cylindrical structure are both 0 mm. The winding spacing of the long carbon fibers in the middle region between the open end and the closed end is 3-6 mm. The angle between the long carbon fibers near the open end of the first winding layer and the radial plane is 0-45°. The angle between the long carbon fibers near the closed end of the first winding layer and the radial plane is 0-45°. The angle between the long carbon fibers in the middle region of the first winding layer and the radial plane is 45-90°.

2. The heating cylinder device for annealing according to claim 1, characterized in that, The carbon fiber mesh on the first winding layer has a uniform density.

3. The heating cylinder device for annealing according to claim 1, characterized in that, The density of long carbon fibers in the first winding layer near the open end of the cylindrical structure and near the closed end of the cylindrical structure are both greater than the density of long carbon fibers in the middle region of the first winding layer between the open end and the closed end.

4. The annealing heating cylinder device according to any one of claims 1-3, characterized in that, The annealing heating cylinder device also includes a coating, which is deposited on the surface of the cylindrical structure by chemical vapor deposition.

5. A method for preparing the annealing heating cylinder device according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Wrap carbon fiber unidirectional fabric around the outer layer of the mold to form a core layer; Step 2: Wrap a carbon fiber mesh around the outer surface of the core layer to form the first winding layer; Step 3: Wrap long carbon fibers around the outer surface of the first winding layer to form a second winding layer; Step 4: Wrap the first winding layer around the outer surface of the second winding layer; Step 5: Repeat steps 3 and 4 several times to obtain the carbon fiber preform; Step 6: Process the carbon fiber preform to obtain a cylindrical structure with one end open and the other end closed; and Step 7: Graphitize the cylindrical structure.

6. The method for preparing the heating cylinder device for annealing according to claim 5, characterized in that, The following steps are included after step 6 and before step 7: depositing pyrolytic carbon on the cylindrical structure using chemical vapor deposition.

7. The method for preparing the heating cylinder device for annealing according to claim 5, characterized in that, It also includes the following step 8: machining the graphitized cylindrical structure to achieve the preset standard size; and purifying the machined cylindrical structure.

8. The method for preparing the annealing heating cylinder device according to any one of claims 5-7, characterized in that, During the graphitization process, the graphitization temperature is 1800℃~2400℃ and the time is 2~10h.

9. The method for preparing the annealing heating cylinder device according to any one of claims 5-7, characterized in that, When winding long carbon fibers onto the outer surface of the first winding layer to form the second winding layer, the specific steps include the following: The long carbon fiber winding spacing is distributed according to the following rules: the long carbon fiber winding spacing near the open end of the cylindrical structure and the long carbon fiber winding spacing near the closed end of the cylindrical structure are both 0, and the long carbon fiber spacing in the middle area between the open end and the closed end is 3 to 6 mm. And / or, the angle between the long carbon fiber near the opening end on the first winding layer and the radial surface is 0 to 45°; And / or, the angle between the long carbon fiber near the closed end on the first winding layer and the radial surface is 0 to 45°; And / or, the angle between the long carbon fiber located in the intermediate region of the first winding layer and the radial plane is 45° to 90°.

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