Nuclear assembly SiC f Method of connecting a / SiC composite tube and an end plug

Abstract

Embodiments of this application provide a core component SiC f / Methods for connecting SiC composite tubes and end plugs, including: using SiC f A tube body is fabricated using SiC composite material, and the tube body has an opening, with a first mating component provided at the opening; SiC is used. f / SiC composite material is used to prepare end plugs for sealing openings. The end plugs are provided with a second mating component. When the end plugs are assembled into the tube body, the first mating component and the second mating component are connected to form a self-locking connection, so that the first connecting surface of the tube body abuts against the second connecting surface of the end plug. A metal layer for diffusion welding is provided on the second connecting surface and / or the second connecting surface. The end plugs are assembled into the tube body, and the assembled end plugs and tube body are placed in a vacuum diffusion welding chamber. A helium environment is constructed in the vacuum diffusion welding chamber to make the helium in the tube body reach a preset pressure. Diffusion welding is performed in the vacuum diffusion welding chamber to seal the tube body and the end plug to form a core assembly cladding tube.

Description

Technical Field

[0001] This application relates to the field of nuclear technology, specifically to a nuclear assembly SiC. f Connection methods for SiC composite tubes and end plugs, and SiC core assembly. f / SiC clad tube. Background Technology

[0002] To improve the thermal conductivity of nuclear assemblies, the cladding tubes of nuclear assemblies need to be filled with helium for heat conduction. In related technologies, when preparing the cladding tubes of nuclear assemblies, a microhole is usually machined on the end plug, and helium is injected into the cladding tube through the microhole. Then, high-pressure plugging welding is performed to seal the microhole. However, this method is relatively complex, and the end plugs made of special materials used in some nuclear assembly cladding tubes are difficult to machine with microholes and / or are not suitable for high-pressure plugging welding. Summary of the Invention

[0003] In view of the above problems, this application is made in order to provide a connection method and a nuclear assembly cladding tube that overcomes or at least partially solves the above problems.

[0004] According to a first aspect of the embodiments of this application, a core component SiC is provided. f / The connection method between the SiC composite tube body and the end plug includes: using SiC f A tube body is fabricated using SiC composite material, and the tube body has an opening, with a first mating component provided at the opening; SiC is used. f / SiC composite material is used to prepare end plugs. The end plugs are used to close the openings. The end plugs are provided with a second mating part. When the end plugs are assembled into the tube body, the first mating part and the second mating part are connected to form a self-locking connection, so that the first connecting surface of the tube body abuts against the second connecting surface of the end plug. A metal layer for diffusion welding is provided on the first connecting surface and / or the second connecting surface. The end plugs are assembled into the tube body, and the assembled end plugs and tube body are placed in a vacuum diffusion welding chamber. A helium environment is constructed in the vacuum diffusion welding chamber so that the helium in the tube body reaches a preset pressure. Diffusion welding is performed in the vacuum diffusion welding chamber to seal the tube body and the end plug to form a core assembly cladding tube.

[0005] According to a second aspect of the embodiments of this application, a core component SiC is provided. f / SiC composite clad tube, including: tube body, using SiC f The tube is prepared from SiC composite material, filled with helium gas, and has an opening; the end plug is made of SiC. f / SiC composite material preparation, end plug connected to tube body to seal opening, wherein the tube body is provided with a first mating part and the end plug is provided with a second mating part, the first mating part and the second mating part are mated and connected, and the first connecting surface of the tube body and the second connecting surface of the end plug are connected by diffusion welding to seal the tube body and the end plug.

[0006] The nuclear assembly cladding tube connection method and the nuclear assembly cladding tube according to the embodiments of this application do not require the machining of micropores on the end plug and the plugging welding during the preparation process. The process is simple and has a wide range of applications. Attached Figure Description

[0007] Figure 1 This is a flowchart of a connection method according to an embodiment of this application; Figure 2 This is a schematic diagram of a tube body according to an embodiment of this application; Figure 3 This is a schematic diagram of an end plug according to an embodiment of this application; Figure 4 For the core component SiC according to the embodiments of this application f A schematic diagram of a SiC composite material clad tube. Detailed Implementation

[0008] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0009] The embodiments of this application first provide a core component SiC f Connection method of SiC composite tube body and end plug.

[0010] The nuclear assemblies mentioned here can be, for example, nuclear fuel assemblies or reactor targets. The cladding tubes of these assemblies need to be filled with helium. In related technologies, zirconium alloys are commonly used to prepare the cladding tubes. However, zirconium alloys are prone to reacting with high-temperature water vapor, producing a large amount of hydrogen and causing the cladding tube to fail. Furthermore, in the preparation process, it is common practice to first machine micropores on the end plugs of the cladding tube, then weld the cladding tube and end plugs using methods such as electron beam ring welding or pressure resistance welding. Finally, high-pressure helium is injected into the tube cavity through the micropores, and high-pressure plugging welding is performed to seal the helium within the cavity. This method is relatively complex, and machining micropores on non-zirconium alloy cladding tubes is difficult. The welding effect of high-pressure plugging welding is also poor, creating weak points in the weld and causing the performance of the nuclear assembly cladding tube to fail to meet expectations.

[0011] Therefore, the SiC core assembly cladding tube of this application is provided. f The connection method between the SiC composite tube body and the end plug solves the above-mentioned problems existing in the related technology, referring to... Figure 1 The core assembly cladding tube connection method of this application embodiment includes: Step S102: Using SiC f The tube body is prepared from SiC composite material. Specifically, the tube body prepared in this step has an opening, and a first mating part is provided at the opening.

[0012] Step S104: Using SiC f / SiC composite material is used to prepare end plugs. Specifically, the end plug prepared in this step is used to close the opening of the tube prepared in step S102. The end plug is provided with a second mating part. When the end plug is assembled into the tube, the second mating part will cooperate with the first mating part to form a self-locking connection, so that the first connecting surface of the tube and the second connecting surface of the end plug abut against each other.

[0013] Step S106: Provide a metal layer for diffusion welding on the first connection surface and / or the second connection surface.

[0014] Step S108: Assemble the end plug onto the tube body, and place the assembled end plug and tube body into the vacuum diffusion welding chamber.

[0015] Step S110: Construct a helium environment in the vacuum diffusion welding chamber to bring the helium inside the tube to a preset pressure. Step S112: Diffusion welding is performed in the vacuum diffusion welding chamber to seal the tube body and end plug to form the core assembly cladding tube.

[0016] Specifically, Figure 2 A schematic diagram of the tube body in one embodiment is shown. Figure 3 A schematic diagram of an end plug in one embodiment is shown. Figure 4 A schematic diagram of a core component casing tube in one embodiment is shown.

[0017] Reference Figure 2 In step S102, an opening 11 is formed on the tube 1, and a first mating part 12 is provided at the opening 11. (Refer to...) Figure 3 The end plug 2 prepared in step S104 is used to close the opening 11 of the tube body 1, and the end plug 2 is provided with a second mating part 21. (Refer to...) Figure 4 When the end plug 2 is assembled on the tube body 1, the first mating part 12 and the second mating part 21 are connected, and the first connecting surface 13 on the tube body 1 will abut against the second connecting surface 22 on the end plug 2.

[0018] The size and shape of the tube body 1 and the opening 11 can be determined by those skilled in the art based on the actual preparation requirements of the nuclear assembly cladding tube, while the overall shape of the end plug 2 can be adapted to the opening 11 of the tube body 1, so that the end plug 2 can be assembled onto the tube body 1 and close the opening 11.

[0019] The first mating part 12 and the second mating part 21 are used to assemble the end plug 2 and the tube body 1. As an example, the first mating part 12 and the second mating part 21 can adopt common mating connection methods such as threaded connection and protrusion-groove connection to achieve self-locking. Those skilled in the art can determine the specific structure and position of the first mating part 12 and the second mating part 21 according to the actual mating connection method selected.

[0020] When the end plug 2 is assembled onto the tube body 1, one surface of the tube body 1 will abut against one surface of the end plug 2. These two surfaces are the first connecting surface 13 and the second connecting surface 22 described above. It is understood that in subsequent steps, diffusion welding will be performed between the first connecting surface 13 and the second connecting surface 22 to seal the end plug 2 and the tube body 1. Therefore, the specific shape of the first connecting surface 13 and the second connecting surface 22 will determine the sealing performance. Those skilled in the art can reasonably set the specific shape of the first connecting surface 13 and the second connecting surface 22 according to the actual sealing performance requirements. Several specific ways of setting the first connecting surface 13 and the second connecting surface 22 will also be provided in the relevant parts below.

[0021] The specific processes for preparing the tube body 1 and end plug 2 in steps S102 and S104 can adopt the processing technology for tube bodies and end plugs provided in related technologies, and there are no restrictions on this.

[0022] After the tube body 1 and end plug 2 are prepared, in step S106, the metal layer used for diffusion welding is deposited on the first connecting surface 13 and / or the second connecting surface 22. The principle of diffusion welding is that by applying a certain pressure to the connector in a vacuum or inert atmosphere, and with the help of temperature, the connecting surfaces with tiny gaps are brought closer together and brought into tight contact. A strong and reliable bonding interface is formed through microstructural changes such as local recrystallization and grain boundary changes of the metal layer on the connecting surface. Those skilled in the art can select a suitable metal layer according to specific performance requirements.

[0023] Next, in step S108, the end plug 2 is assembled onto the tube body 1, and the assembled end plug 2 and tube body 1 are placed in the vacuum diffusion welding chamber. Then, in step S110, a helium environment is created in the vacuum diffusion welding chamber.

[0024] Understandably, although the end plug 2 and the tube body 1 have been assembled at this time, the first connecting surface 13 and the second connecting surface 22 are only in a state of mutual contact and have not yet formed a seal. Therefore, when constructing a helium environment in the vacuum diffusion welding cavity, the helium in the vacuum diffusion welding cavity will enter the cavity of the tube body 1 through the tiny gap between the two connecting surfaces. Furthermore, the pressure of the helium in the cavity is basically the same as the pressure of the helium in the vacuum diffusion welding cavity. The pressure of the helium in the tube body 1 can be controlled by controlling the pressure of the helium in the vacuum diffusion welding cavity to achieve a preset pressure. This preset pressure can be determined according to the specific preparation requirements of the nuclear assembly cladding tube.

[0025] When constructing the helium environment in step S110, a vacuum process can be performed first to extract the air from the vacuum diffusion welding cavity and the inside of the tube 1, and then helium can be introduced.

[0026] Next, diffusion welding is performed in step S112 to seal the tube body 1 and end plug 2 together to form the nuclear assembly cladding tube. After welding, helium gas will remain in the lumen of the nuclear assembly cladding tube. Since a high-pressure helium environment has been established in step S110, the diffusion welding in step S112 mainly requires controlling the temperature change to alter the structure of the metal layer between the first connecting surface 13 and the second connecting surface 22 to achieve a sealed connection. The specific diffusion welding process can be determined by those skilled in the art based on the selected diffusion solder and relevant technical standards in the field.

[0027] This embodiment uses SiC fThe SiC composite material is used to prepare the tube body and end plug of the nuclear assembly cladding tube. These materials are resistant to high temperatures, corrosion, and radiation, which can effectively prevent the failure of the nuclear assembly cladding tube. At the same time, the connection method provided in this embodiment does not require the processing of micropores or hole plugging welding during the preparation of the nuclear assembly cladding tube. Instead, the tube body 1 and end plug 2 can be sealed and connected in a helium environment in the next step. The process is relatively simple and has a wide range of applications.

[0028] In some embodiments, refer to Figure 2 and Figure 3 The first connecting surface 13 and the second connecting surface 22 can be annular inclined surfaces. Setting the first connecting surface 13 and the second connecting surface 22 as annular inclined surfaces allows for a larger connection area between them, thereby helping to improve the sealing performance after diffusion welding. In some other embodiments, the first connecting surface 13 and the second connecting surface 22 can also be set into other suitable shapes. For example, one of the first connecting surface 13 and the second connecting surface 22 can be an annular convex surface and the other can be an annular concave surface; or, both the first connecting surface 13 and the second connecting surface 22 can be annular planes.

[0029] In some embodiments, the first mating member 12 and the first connecting surface 13 are disposed on the inner surface of the tube body 1, and the second mating member 21 and the second connecting surface 22 are disposed on the outer surface of the end plug 2. That is, in this embodiment, the end plug 2 is partially inserted into the tube body 1 for assembly, thereby improving the sealing performance after diffusion welding. In some other embodiments, the first mating member 12 and the first connecting surface 13 may also be disposed on the outer surface of the tube body 1, and the second mating member 21 and the second connecting surface 22 may be disposed on the inner surface of the end plug 2, that is, the end plug 2 is assembled on the outer side of the tube body 1.

[0030] In some embodiments, the mating connection between the first mating member 12 and the second mating member 21 is a threaded connection. As an example, the first mating member 12 may be a thread formed on the inner surface of the tube body 1, while the second mating member 21 may be a protrusion formed on the outer surface of the end plug 2. The mating connection between the two can be achieved by screwing the second mating member 21 into the first mating member 12.

[0031] Understandably, when the first mating part 12 and the second mating part 21 are connected by threads, their relative positions are adjustable, and changes in their relative positions will alter the pressure between the first connecting surface 13 and the second connecting surface 22. Therefore, when assembling the end plug 2 onto the tube body 1, the relative positions of the first mating part 12 and the second mating part 21 can be further adjusted to ensure that the pressure between the first connecting surface 13 and the second connecting surface 22 is within a preset range.

[0032] Understandably, if the pressure between the first connecting surface 13 and the second connecting surface 22 is too low, the sealing performance after diffusion welding may not meet expectations. Conversely, if the pressure between the first connecting surface 13 and the second connecting surface 22 is too high, it may cause extrusion deformation of the connecting surfaces after diffusion welding. In this embodiment, the pressure between the two connecting surfaces can be controlled within a reasonable range by adjusting the relative position between the first mating part 12 and the second mating part 21, thereby obtaining a better welding effect.

[0033] In some embodiments, the metal layer comprises multiple layers of metal materials stacked together. In some embodiments, the multiple layers of metal materials can be different metal materials, such as Cr, Au, Cu, Ti, Pt, etc. It should be noted that the stacking order and thickness of these metal materials need to be determined through specific calculations and measurements; otherwise, a good welding effect may not be achieved, or even welding may not be possible.

[0034] In some embodiments, the metal layer may include five layers of metal material from the inside out. Here, the inner side refers to the side near the end plug, and the outer side refers to the side near the tube body. The first layer of metal material is one of Ti, Cr, and Nb, with a purity of 99.999% and a thickness of 5-10 μm; the second layer of metal material is one of Cu and Ni, with a purity of 99.999% and a thickness of 5-10 μm; the third layer of metal material is one of Au and Pt, with a purity of 99.999% and a thickness of 5-10 μm; the fourth layer of metal material is one of Cu and Ni, with a purity of 99.999% and a thickness of 5-10 μm; and the outermost metal material, i.e., the fifth layer of metal material, is one of Ti, Cr, and Nb, with a purity of 99.999% and a thickness of 5-10 μm.

[0035] In some embodiments, SiC is used in the fabrication of the tube body and end plug. f The structure of the / SiC composite material can be one of 2D, 2.5D, or 3D braiding.

[0036] In some embodiments, SiC f / SiC composite materials can be prepared using one of the following processes: chemical vapor infiltration (CVI), polymer impregnation-pyrolysis (PIP), reactive melting infiltration (MI), or nano-infiltration and transient eutectic process (NITE).

[0037] In some embodiments, a metal layer may be deposited on the first and / or second connection surfaces using deposition or magnetron sputtering methods.

[0038] The metal layer can be entirely disposed on the first connecting surface 13, entirely disposed on the second connecting surface 22, or partially disposed on the first connecting surface 13 and partially disposed on the second connecting surface 22. Understandably, the process of disposing of a metal layer on the outer surface of an object is simpler and easier to control than disposing of a metal layer on the inner surface of the object. Therefore, if the second connecting surface 22 is disposed on the outer surface of the end plug 2, the entire metal layer can be disposed on the second connecting surface 22; if the first connecting surface 13 is disposed on the outer surface of the tube body 1, the entire metal layer can be disposed on the first connecting surface 13.

[0039] In some embodiments, before applying a metal layer to the first connecting surface 13 and / or the second connecting surface 22, the first connecting surface 13 and / or the second connecting surface 22 may be polished to change the roughness of the first connecting surface 13 and / or the second connecting surface 22. Polishing is primarily to increase the roughness of the first connecting surface 13 and / or the second connecting surface 22, so that the metal layer can be better applied to the first connecting surface 13 and / or the second connecting surface 22 without accidentally detaching during the welding process.

[0040] In some embodiments, as described above, the tube body 1 and the end plug 2 can be made of silicon carbide material. Zirconium alloy materials commonly used in the art are prone to react with high-temperature water vapor to produce a large amount of hydrogen gas and cause the cladding tube to fail. In contrast, silicon carbide composite materials are resistant to high temperature, corrosion, and radiation, and have higher safety performance.

[0041] The following will describe in more detail the core component cladding tube connection method in one or more embodiments mentioned above, using two specific examples.

[0042] Example 1 First, a tube body 1 and an end plug 2 are prepared. When preparing the tube body 1, a first mating part 12 is provided on the inner surface of the tube body 1. The first mating part 12 is a spiral groove with a depth of 1 mm. A second mating part 21 is provided on the outer surface of the end plug 2. The second mating part 21 is a protrusion with a height of 1 mm. Both the first connecting surface 13 on the tube body 1 and the second connecting surface 22 on the end plug 2 are annular inclined surfaces.

[0043] The second connecting surface 22 of the end plug 2 was polished with 1500 grit and 2000 grit sandpaper respectively. After polishing, it was placed in an alcohol-acetone solution for ultrasonic cleaning for 30 minutes. After removal, it was dried in a vacuum oven at 200°C for 60 minutes.

[0044] Next, a metal layer is deposited on the second connection surface 22 using a deposition method. The metal layer consists of five stacked metal layers: the first metal layer is a Cr layer with a purity of 99.999% and a thickness of 7 μm; the second metal layer is a Cu layer with a purity of 99.999% and a thickness of 7 μm; the third metal layer is an Au layer with a purity of 99.999% and a thickness of 10 μm; the fourth metal layer is a Cu layer with a purity of 99.999% and a thickness of 7 μm; and the fifth and outermost layer is a Cr layer with a purity of 99.999% and a thickness of 7 μm.

[0045] Next, the end plug 2 is assembled into the tube body 1. During the assembly process, attention should be paid to adjusting the relative positions between the first mating part 12 and the second mating part 21 so that the pressure between the first connecting surface 13 and the second connecting surface 22 is within a suitable range.

[0046] Next, the assembled tube body 1 and end plug 2 are fixed and clamped using a high-temperature resistant positioning fixture and placed into the brazing furnace. A rotary vane pump is used to evacuate the vacuum level inside the brazing furnace to 3×10⁻⁶. -3 After Pa, helium is added again to make the helium pressure inside tube 1 reach the target pressure.

[0047] Next, a diffusion welding procedure was performed with a heating rate of 15℃ / min, a heating temperature of 1300℃, a holding time of 200min, a loading pressure of 15MPa, and a cooling rate of 10℃ / min. After the temperature dropped to 250℃, the furnace was then cooled to room temperature.

[0048] Example 2 The tube body 1 and end plug 2 prepared in this embodiment are the same as those in Embodiment 1, and will not be described again here. The difference is that the metal layer in this embodiment is set by magnetron sputtering. The metal layer includes five stacked metal layers. The first metal layer is a Ti layer with a purity of 99.999% and a thickness of 5 μm; the second metal layer is a Cu layer with a purity of 99.999% and a thickness of 5 μm; the third layer is a Pt layer with a purity of 99.999% and a thickness of 7 μm; the fourth metal layer is a Cu layer with a purity of 99.999% and a thickness of 5 μm; and the fifth layer, which is the outermost layer, is a Ti layer with a purity of 99.999% and a thickness of 5 μm.

[0049] During diffusion welding, the heating rate was 10℃ / min; the heating temperature was 1200℃; the holding time was 120 min; the loading pressure was 10MPa; and the cooling rate was 5℃ / min. After the temperature dropped to 250℃, it was then cooled to room temperature in the furnace.

[0050] Embodiments of this application also provide a core assembly cladding tube, see reference to Figure 4 It includes a tube body 1 and an end plug 2, both of which are made of SiC. fIt is made of SiC composite material. The tube body 1 is filled with helium gas and has an opening 11. The end plug 2 is connected to the tube body 1 to close the opening 11. The tube body 1 is provided with a first mating part 12 and the end plug 2 is provided with a second mating part 21. The first mating part 12 and the second mating part 21 are mated and connected. Furthermore, the first connecting surface 13 of the tube body 1 and the second connecting surface 22 of the end plug 2 are connected by diffusion welding to seal the tube body 1 and the end plug 2.

[0051] In some embodiments, as described above, the first connecting surface 13 and the second connecting surface 22 can be annular inclined surfaces.

[0052] In some embodiments, the first mating member 12 and the first connecting surface 13 are disposed on the inner surface of the tube body 1, and the second mating member 21 and the second connecting surface 22 are disposed on the outer surface of the end plug 2.

[0053] In some embodiments, the mating connection between the first mating member 12 and the second mating member 21 is a threaded connection. For example, the first mating member 12 may be a spiral groove, and the second mating member 21 may be a protrusion.

[0054] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this application can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this application. In particular, the features described in the various embodiments and / or claims of this application can be combined or combined in various ways without departing from the spirit and teachings of this application. All such combinations and / or combinations fall within the scope of this application.

[0055] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit this application. 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.

Claims

1. A core component SiC f The connection methods for SiC composite tube bodies and end plugs include: Using SiC f A tube body is prepared from SiC composite material, wherein the tube body has an opening and a first mating part is provided at the opening; Using SiC f / SiC composite material is used to prepare end plugs, which are used to close the opening. The end plugs are provided with a second mating part. When the end plugs are assembled into the tube body, the first mating part and the second mating part are connected to form a self-locking connection, so that the first connecting surface of the tube body abuts against the second connecting surface of the end plug. A metal layer for diffusion welding is provided on the first connection surface and / or the second connection surface; The end plug is assembled onto the tube body, and the assembled end plug and the tube body are placed in a vacuum diffusion welding chamber; A helium environment is constructed in the vacuum diffusion welding cavity so that the helium inside the tube reaches a preset pressure. Diffusion welding is performed in the vacuum diffusion welding chamber to seal the tube body and the end plug to form a core assembly cladding tube; The metal layer comprises multiple layers of metal materials stacked together; The metal layer comprises five layers of metal material from the inside out. The first layer is made of one of Ti, Cr, and Nb, with a purity of 99.999% and a thickness of 5-10 μm. The second layer is made of one of Cu and Ni, with a purity of 99.999% and a thickness of 5-10 μm. The third layer is made of one of Au and Pt, with a purity of 99.999% and a thickness of 5-10 μm. The fourth layer is made of one of Cu and Ni, with a purity of 99.999% and a thickness of 5-10 μm. The fifth layer is made of one of Ti, Cr, and Nb, with a purity of 99.999% and a thickness of 5-10 μm.

2. The method according to claim 1, wherein, The first connecting surface and the second connecting surface are annular inclined surfaces.

3. The method according to claim 1, wherein, The first mating component and the first connecting surface are disposed on the inner surface of the tube body, and the second mating component and the second connecting surface are disposed on the outer surface of the end plug.

4. The method according to claim 1, wherein, The first mating part and the second mating part are connected by a threaded connection.

5. The method according to claim 4, wherein, Assembling the end plug into the tube body includes: Adjust the relative positions of the first mating component and the second mating component so that the pressure between the first connecting surface and the second connecting surface is within a preset range.

6. The method according to claim 1, wherein, Providing a metal layer for diffusion welding on the first connection surface and / or the second connection surface includes: The metal layer is deposited on the first connection surface and / or the second connection surface using deposition or magnetron sputtering.

7. The method according to claim 6, further comprising: Before applying the metal layer to the first connecting surface and / or the second connecting surface, the first connecting surface and / or the second connecting surface are polished to change the roughness of the first connecting surface and / or the second connecting surface.

8. The method according to claim 1, wherein, The SiC f The structure of the / SiC composite material is one of 2D, 2.5D, or 3D braiding.

9. The method according to claim 8, wherein, The SiC f The preparation of / SiC composite materials can be carried out using one of the following processes: chemical vapor infiltration, polymer impregnation-pyrolysis, reactive melting infiltration, or nano-infiltration and transient eutectic process.

10. A core component SiC f / SiC composite material clad tube, including: Tube body, using SiC f / SiC composite material preparation, the tube is filled with helium gas and the tube has an opening; End plugs, using SiC f / SiC composite material preparation, the end plug is connected to the tube body to close the opening, wherein the tube body is provided with a first mating part, the end plug is provided with a second mating part, the first mating part and the second mating part are mated and connected, and the first connecting surface of the tube body and the second connecting surface of the end plug are connected by diffusion welding to seal the tube body and the end plug. A metal layer for diffusion welding is provided on the first connection surface and / or the second connection surface; The metal layer comprises multiple layers of metal materials stacked together; The metal layer comprises five layers of metal material from the inside out. The first layer is one of Ti, Cr, and Nb, with a purity of 99.999% and a thickness of 5-10 μm. The second layer is one of Cu and Ni, with a purity of 99.999% and a thickness of 5-10 μm. The third layer is one of Au and Pt, with a purity of 99.999% and a thickness of 5-10 μm. The fourth layer is one of Cu and Ni, with a purity of 99.999% and a thickness of 5-10 μm. The fifth layer is one of Ti, Cr, and Nb, with a purity of 99.999% and a thickness of 5-10 μm.

Images