Flexible thermal protection structure of sensor cable in high-temperature test equipment and preparation method of flexible thermal protection structure

Abstract

The invention belongs to the technical field of thermal protection, and relates to a flexible thermal protection structure of a sensor cable in high-temperature test equipment and a preparation method of the flexible thermal protection structure. Comprising an inner fastening coating layer made of a knitted stainless steel mesh; the inner fastening coating layer is used for fastening and coating a sensor cable; the flexible heat insulation layer is tightly coated outside the inner fastening coating layer; the flexible heat insulation layer is made of a flexible alumina fiber needled carpet; the flexible heat insulation ceramic material layer is coated outside the flexible heat insulation layer; the flexible heat insulation ceramic material layer is made of a ceramic nano material with a porous microstructure; the flexible sealing layer is coated outside the flexible heat insulation ceramic material layer; the flexible sealing layer is made of polyimide; the force-bearing shape-fixing layer is wound and coated outside the flexible sealing layer; and the force-bearing shape-fixing layer is made of a glass fiber aluminum foil adhesive tape. The heat insulation performance of the sensor cable is remarkably improved, the service life of the sensor cable in a high-temperature environment is remarkably prolonged, and therefore the accuracy of data collection and the safety of system operation in the high-temperature testing process are ensured.

Description

Technical Field

[0001] This invention belongs to the field of thermal protection technology, and relates to a flexible thermal protection structure for sensor cables in high-temperature testing equipment and its preparation method. Background Technology

[0002] With the rapid development of aerospace, energy, and other fields, the performance requirements for various cutting-edge products (such as aero engines, gas turbines, high-speed reentry vehicles, and satellites) are becoming increasingly stringent. These products and their core components need to operate reliably for extended periods under extreme high temperatures, high pressures, and complex thermodynamic cycles. Therefore, conducting thorough and accurate high-temperature environment simulation tests on their materials, components, and even the entire system has become an indispensable and crucial step in verifying designs, ensuring safety, and improving performance. Accordingly, the high-temperature testing equipment used for such tests must possess extremely high temperature ranges and control precision, be able to simulate complex heating methods and working atmospheres (such as oxidizing and reducing atmospheres), and generate sufficient heat flux density to reproduce real service conditions.

[0003] In practical high-temperature component testing, to accurately acquire multi-physical field signals such as strain, temperature, and vibration of the test component under high-temperature conditions, cables of multi-channel high-frequency acquisition sensors need to be introduced into the test chamber and connected to the test component. Since the component may undergo displacement, rotation, or thermal deformation during testing, these cables inside the equipment often need to withstand repeated torsion, bending, and other dynamic mechanical stresses. Simultaneously, the test chamber often contains high-temperature radiation and convection thermal environments of hundreds or even thousands of degrees Celsius, placing extremely stringent requirements on the cables themselves and their thermal protection measures. However, existing thermal protection materials or structures commonly used in such scenarios (such as certain rigid ceramic sheaths, metal braided tubing, or simple thermal insulation wrapping materials) often have significant drawbacks: their thermal protection structures are mostly rigid, making it difficult to adapt to the dynamic bending and torsion required by the cables during testing; their overall weight is large, potentially interfering with the dynamic response of the test component or increasing the support burden; their heat resistance time is limited, making them prone to performance degradation or failure during prolonged continuous high-temperature testing; or their thermal insulation efficiency is insufficient, failing to ensure the normal operating temperature of the internal cables under prolonged high-temperature exposure. These defects severely restrict the reliability of test data, the safety of the test process, and the feasibility of long-term high-temperature testing, becoming a prominent bottleneck restricting the development of advanced high-temperature testing technology. Summary of the Invention

[0004] To address the problems of rigid thermal protection structures, excessive weight, short heat resistance time, and failure to meet long-term high-efficiency temperature resistance requirements in existing thermal protection materials, this invention provides a flexible thermal protection structure for sensor cables in high-temperature testing equipment and its preparation method. This significantly improves the thermal insulation performance and service life of sensor cables in high-temperature environments, thereby ensuring the accuracy of data acquisition and the safety of system operation during high-temperature testing.

[0005] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a flexible thermal protection structure for sensor cables inside a high-temperature testing device, comprising: The inner fastening covering layer is made of knitted stainless steel mesh; the inner fastening covering layer is used to fasten and cover the sensor cable. A flexible thermal insulation layer is tightly wrapped around the outside of the inner fastening covering layer; the flexible thermal insulation layer is made of flexible alumina fiber needled blanket. A flexible thermal insulation ceramic material layer is wrapped around the outside of the flexible thermal insulation layer; the flexible thermal insulation ceramic material layer is made of ceramic nanomaterials with a porous microstructure. A flexible sealing layer is wrapped around the flexible thermal insulation ceramic material layer; the flexible sealing layer is made of polyimide. A load-bearing solid layer is wrapped around the outside of the flexible sealing layer; the load-bearing solid layer is made of fiberglass aluminum foil tape.

[0006] Preferably, the knitted stainless steel mesh is a knitted 316 stainless steel mesh; the knitted 316 stainless steel mesh contains 2% to 3% molybdenum by mass percentage.

[0007] Preferably, the flexible alumina fiber needled blanket is made from alumina fibers prepared by the sol-gel method and processed by a needle-punching process.

[0008] Preferably, the ceramic nanomaterial has a thickness of 5 μm to 20 μm and an areal density of 10 g / m³. 2 Up to 30 g / m 2 And its thermal conductivity is ≤0.03 W / (m). K).

[0009] Preferably, the ceramic nanomaterial with a porous microstructure is a silicon nitride nanowire flexible ceramic material.

[0010] Preferably, the initial thermal decomposition temperature of the polyimide is 500℃~600℃, and its limiting oxygen index is 36%~50%.

[0011] Preferably, the glass fiber aluminum foil tape comprises a glass fiber cloth substrate and an aluminum foil layer laminated to the surface of the glass fiber cloth substrate.

[0012] Preferably, the flexible thermal insulation ceramic material layer and the flexible sealing layer are bonded and fixed together by an adhesive.

[0013] Preferably, the load-bearing solid layer is wound in a spiral or longitudinally overlapping manner, and the winding overlap rate is 30% to 50% of the tape width.

[0014] Secondly, this invention provides a method for preparing a flexible thermal protection structure for sensor cables inside a high-temperature testing device, comprising the following steps: Bundle together the multiple sensor cables; The bundled sensor cables are wrapped and secured with a knitted stainless steel mesh to form an inner fastening covering layer. A flexible alumina fiber needled blanket is wrapped around the outside of the inner fastening covering layer to form a flexible heat insulation layer; On the outside of the flexible thermal insulation layer, a ceramic nanomaterial with a porous microstructure is coated to form a flexible thermal insulation ceramic material layer. A polyimide film is coated on the outside of the flexible thermal insulation ceramic material layer to form a flexible sealing layer; Fiberglass aluminum foil tape is wrapped around the outside of the flexible sealing layer to cover the flexible sealing layer and form the load-bearing solid layer.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention employs an inner fastening layer made of knitted stainless steel mesh, which not only effectively bundles and secures sensor cables but also provides a reliable mechanical framework and primary thermal protection for the entire structure due to its excellent flexibility and mechanical strength. A flexible thermal insulation layer made of flexible alumina fiber needle-punched blanket effectively blocks external high-temperature heat flow thanks to its low thermal conductivity and high thermal stability. A flexible thermal insulation ceramic material layer made of ceramic nanomaterials with a porous microstructure significantly improves the overall thermal insulation performance without increasing thickness or weight. A flexible sealing layer made of polyimide, with its excellent high-temperature stability and flexibility, achieves a sealed enclosure and electrical insulation protection for the internal structure. The outermost load-bearing solid layer is formed by tightly wrapping glass fiber aluminum foil tape, which not only gives the protective structure final overall rigidity, tensile strength, and wear resistance, but its surface aluminum foil layer also effectively reflects radiant heat. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of a flexible thermal protection structure for sensor cables inside a high-temperature testing device according to the present invention.

[0018] The components include: 1. Sensor cable; 2. Inner fastening covering layer; 3. Flexible heat insulation layer; 4. Flexible heat insulation ceramic material layer; 5. Flexible sealing layer; 6. Load-bearing solidification layer. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings: The first objective of this invention is to provide a flexible thermal protection structure for sensor cables within a high-temperature testing device, such as... Figure 1 As shown, it includes: The inner fastening covering layer 2 is made of knitted stainless steel mesh; the inner fastening covering layer 2 is used to fasten and cover the sensor cable 1. A flexible heat insulation layer 3 is tightly wrapped around the outside of the inner fastening covering layer 2; the flexible heat insulation layer 3 is made of flexible alumina fiber needled blanket. A flexible thermal insulation ceramic material layer 4 is wrapped around the outside of the flexible thermal insulation layer 3; the flexible thermal insulation ceramic material layer 4 is made of ceramic nanomaterials with porous microstructure. A flexible sealing layer 5 is wrapped around the outside of the flexible thermal insulation ceramic material layer 4; the flexible sealing layer 5 is made of polyimide. The load-bearing solid layer 6 is wrapped around the outside of the flexible sealing layer 5; the load-bearing solid layer 6 is made of glass fiber aluminum foil tape.

[0026] The inner fastening covering layer 2 is made of knitted stainless steel mesh, serving as the base layer for the sensor cable 1 in direct contact. Its excellent flexibility and mechanical strength not only fasten the cable bundle and prevent loosening, but also withstand frequent multi-dimensional bending and friction, providing a reliable mechanical framework and primary thermal protection for the overall structure. The flexible thermal insulation layer 3 is composed of alumina fiber needled blanket, serving as the core thermal insulation barrier. Its low thermal conductivity and excellent high-temperature stability effectively block extreme external heat flow, ensuring that the internal cable temperature remains within a safe operating range. The flexible thermal insulation ceramic material layer 4 further enhances the thermal insulation performance in the form of ultra-thin ceramic nanomaterials. Its extremely low thermal conductivity and thermal mass significantly improve the overall thermal insulation performance without significantly increasing thickness and weight, and can perfectly conform to complex shapes. The flexible sealing layer 5 is made of polyimide. This layer not only utilizes its excellent high-temperature stability and flexibility to wrap and seal the internal structure, preventing hot airflow from entering the interlayer gaps, but also provides necessary electrical insulation protection. The outermost load-bearing solid layer 6 is tightly wrapped with fiberglass aluminum foil tape, giving the protective structure final overall rigidity, tensile strength, and abrasion resistance. The aluminum foil on its surface reflects radiant heat, while the fiberglass substrate ensures long-term structural integrity at high temperatures. The flexible thermal protection structure of this invention achieves the characteristics of lightweight, flexibility, efficient thermal insulation, and long-term durability, completely overcoming the shortcomings of traditional rigid protective structures, such as being bulky, not resistant to bending, and having a short thermal insulation time.

[0027] For example, the knitted stainless steel mesh is a knitted 316 stainless steel mesh; in the knitted 316 stainless steel mesh, the molybdenum content is 2%~3% by mass percentage. The addition of molybdenum significantly improves the alloy's resistance to pitting and crevice corrosion from chlorides (such as seawater and de-icing salt) and various industrial chemicals. Structurally, the mesh surface woven using the knitting (warp knitting) process has good multi-directional deformation adaptability, capable of withstanding multi-dimensional bending, stretching, and compression. It is not prone to permanent deformation or fatigue fracture under dynamic loads. This characteristic allows it to perfectly fit irregular surfaces and is easy to process into complex shapes such as cylinders and bags. The 316 stainless steel matrix itself has high mechanical strength, and combined with the knitted loop structure, the load can be evenly distributed across the entire mesh surface, thus making it less prone to breakage under pressure and friction, effectively extending its service life. This material can be used continuously at temperatures below 800°C (and can withstand higher temperatures for short periods under non-load-bearing, no mechanical stress conditions), and still maintains good strength and oxidation resistance in high-temperature environments. Meanwhile, it has good toughness in low-temperature environments and is not easily brittle; the mesh surface is flexible and easy to process, and can be easily cut, sewn, and edged without easily fraying.

[0028] The flexible alumina fiber needle-punched blanket is made from alumina fibers prepared by the sol-gel method and then processed through a needle-punching process. The alumina fibers are mainly composed of alumina and silica composites, with a dense internal structure and stable crystal form. The needle-punching process significantly enhances the three-dimensional interweaving between the fibers, thus endowing the material with excellent tensile strength and hot strength. This material also possesses good resistance to chemical corrosion, exhibiting low thermal shrinkage, low thermal conductivity, and low slag content, and can withstand long-term use at temperatures up to 1000℃. Under high-temperature conditions, this blanket material demonstrates excellent dimensional stability and thermal insulation performance, making it suitable for long-term stable use in extreme high-temperature environments.

[0029] The ceramic nanomaterials described combine the high-temperature performance of ceramics with the processability of flexible materials. For example, silicon nitride nanowire flexible ceramic films retain the inherent high-temperature resistance, oxidation resistance, and corrosion resistance of ceramics while achieving excellent flexibility and plasticity, enabling bending, folding, and other deformations, and adapting to the application and installation on various complex surfaces. These films are only 5 μm to 20 μm thick, exhibiting ultra-thin flexibility and supporting roll-to-roll continuous production; their areal density is as low as 10 g / m³. 2 Up to 30 g / m 2 Thermal conductivity not greater than 0.03 W / (m With a temperature range of up to 1200℃, it is suitable for thermal insulation protection in space-constrained scenarios such as electronic devices and precision instruments. It can be directly attached to curved or irregularly shaped surfaces without affecting the original structure and function of the equipment.

[0030] Polyimide molecules are composed of rigid aromatic heterocycles and flexible bridging bonds such as ether bonds (-O-) or carbonyl groups (-C=O). This combination of rigidity and flexibility endows the material with extremely high mechanical strength and excellent deformation capabilities. This material can withstand thousands to tens of thousands of repeated bending and rolling without breaking or delamination, and its electrical conductivity does not significantly deteriorate. The bending radius can reach millimeters or even sub-millimeter levels, making it suitable for highly compact folding and rolling designs. In an inert gas environment, the initial thermal decomposition temperature of polyimide is typically as high as 500℃~600℃, indicating that chemical bond breaking and mass loss only begin above this temperature, demonstrating excellent thermal stability. Furthermore, polyimide films have a very low coefficient of thermal expansion, similar to that of metals such as copper. This characteristic allows it to expand and contract synchronously with the attached material (such as copper foil or silicon chips) during temperature changes, thus avoiding warping, delamination, or circuit breakage caused by thermal stress, which is particularly important in the field of microelectronics. Polyimide is an inherently flame-retardant material that does not require the addition of flame retardants. Its limiting oxygen index is as high as 36% to 50%, which is much higher than the oxygen content of about 21% in the air. Therefore, it cannot continue to burn in ordinary air and can self-extinguish after being removed from the fire source, and it produces very little smoke.

[0031] The fiberglass aluminum foil tape comprises a fiberglass cloth substrate and an aluminum foil layer laminated to the surface of the fiberglass cloth substrate. As an inorganic material, the fiberglass cloth possesses extremely high heat resistance, allowing for long-term use at 550°C without burning or melting, and short-term temperature resistance exceeding 700°C. Its primary function is to provide structural support and mechanical strength. The aluminum foil has a melting point of approximately 660°C and remains stable within the typical application temperature range of -30°C to 300°C, exhibiting both good thermal conductivity and radiative heat reflection capabilities. This tape boasts extremely high tensile strength, thanks to the fiberglass cloth substrate, which imparts excellent tensile properties. Typical tensile strength exceeds 1000 N / 25 mm (approximately 100 N / cm), making it resistant to breakage and suitable for binding and securing applications requiring a certain level of tension. Its tear strength is also good, thanks to the mesh structure of the fiberglass cloth, effectively inhibiting tear propagation even with small cuts. Meanwhile, the fiberglass substrate provides good flexibility, allowing the tape to adhere to irregular surfaces such as pipes, elbows, and valves, while also having a certain degree of stiffness, making it easy to operate and tear with one hand.

[0032] The flexible thermal insulation ceramic material layer 4 and the flexible sealing layer 5 are fixed together by adhesive bonding. For example, an organosilicon resin-based adhesive can be used. This type of adhesive, after curing, can withstand high-temperature environments while maintaining appropriate flexibility, thus adapting to the dynamic deformation of the protective structure during use. Adhesive bonding not only effectively eliminates potential gaps or relative displacements between layers, ensuring continuous interruption of heat flow paths, but also significantly improves the mechanical integrity of the composite structure. This allows the functional layers to continue working closely together even under repeated bending, vibration, or rapid temperature changes, preventing delamination or failure, and ultimately ensuring the long-term reliable operation of the thermal protection system.

[0033] The load-bearing solid layer 6 is wound using either helical winding or longitudinal overlapping winding, with an overlap rate of 30% to 50% of the tape width. This winding method ensures uniform, gapless coverage of the outer surface of the protective layer, forming a continuous and dense mechanically reinforced shell while achieving a multi-layered composite reinforcement effect through the overlapping structure. Helical winding or longitudinal overlapping winding can be flexibly selected according to cable routing and protection requirements. Its orderly winding layout not only optimizes the tensile and shear strength of the outer layer but also significantly improves the overall structure's wear resistance and stability against external mechanical impacts. This invention ensures that the outer protective layer is not prone to loosening or cracking during long-term dynamic use, thereby maintaining the long-term reliability and structural integrity of the thermal protection system under harsh conditions such as high temperatures and bending.

[0034] The second objective of this invention is to provide a method for preparing a flexible thermal protection structure for sensor cables inside a high-temperature testing device, comprising the following steps: Bundle together the multiple sensor cables 1; The bundled sensor cables 1 are wrapped and fixed with a knitted stainless steel mesh to form an inner fastening covering layer 2. A flexible alumina fiber needled blanket is wrapped around the outside of the inner fastening covering layer 2 to form a flexible heat insulation layer 3; On the outside of the flexible heat insulation layer 3, a ceramic nanomaterial with a porous microstructure is coated to form a flexible heat insulation ceramic material layer 4; A polyimide film is coated on the outside of the flexible thermal insulation ceramic material layer 4 to form a flexible sealing layer 5; Fiberglass aluminum foil tape is wrapped around the outside of the flexible sealing layer 5, so that the fiberglass aluminum foil tape covers the flexible sealing layer 5 to form the load-bearing solid layer 6.

[0035] This method achieves synergistic enhancement of the properties of each layer of material through layer-by-layer functionalization composite, which not only ensures the integrity and reliability of the protective structure, but also gives it excellent flexibility and long-term high temperature resistance, making it suitable for long-term stable use in dynamic and harsh environments.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flexible thermal protection structure for sensor cables inside a high-temperature testing device, characterized in that, include: The inner fastening covering layer (2) is made of knitted stainless steel mesh; the inner fastening covering layer (2) is used to fasten the sensor cable (1). A flexible heat insulation layer (3) is tightly wrapped around the outside of the inner fastening covering layer (2); the flexible heat insulation layer (3) is made of flexible alumina fiber needled blanket; A flexible thermal insulation ceramic material layer (4) is wrapped around the outside of the flexible thermal insulation layer (3); the flexible thermal insulation ceramic material layer (4) is made of ceramic nanomaterials with a porous microstructure; A flexible sealing layer (5) is wrapped around the outside of the flexible thermal insulation ceramic material layer (4); the flexible sealing layer (5) is made of polyimide; The load-bearing solid layer (6) is wrapped around the outside of the flexible sealing layer (5); the load-bearing solid layer (6) is made of glass fiber aluminum foil tape.

2. The flexible thermal protection structure for sensor cables in a high-temperature testing device according to claim 1, characterized in that, The knitted stainless steel mesh is a knitted 316 stainless steel mesh; the knitted 316 stainless steel mesh contains 2% to 3% molybdenum by mass percentage.

3. The flexible thermal protection structure for sensor cables in a high-temperature testing device according to claim 1, characterized in that, The flexible alumina fiber needled blanket is made from alumina fibers prepared by the sol-gel method and processed by a needle-punching process.

4. The flexible thermal protection structure for sensor cables in a high-temperature testing device according to claim 1, characterized in that, The ceramic nanomaterial has a thickness of 5 μm to 20 μm and an areal density of 10 g / m³. 2 Up to 30 g / m 2 And its thermal conductivity is ≤0.03 W / (m). K).

5. The flexible thermal protection structure for sensor cables in a high-temperature testing device according to claim 1, characterized in that, The ceramic nanomaterial with a porous microstructure is a flexible ceramic material made of silicon nitride nanowires.

6. The flexible thermal protection structure for sensor cables in a high-temperature testing device according to claim 1, characterized in that, The polyimide has an initial thermal decomposition temperature of 500℃~600℃ and a limiting oxygen index of 36%~50%.

7. The flexible thermal protection structure for sensor cables in a high-temperature testing device according to claim 1, characterized in that, The glass fiber aluminum foil tape includes a glass fiber cloth substrate and an aluminum foil layer laminated on the surface of the glass fiber cloth substrate.

8. The flexible thermal protection structure for sensor cables in a high-temperature testing device according to claim 1, characterized in that, The flexible thermal insulation ceramic material layer (4) and the flexible sealing layer (5) are bonded and fixed together by an adhesive.

9. The flexible thermal protection structure for sensor cables in a high-temperature testing device according to claim 1, characterized in that, The load-bearing solid layer (6) is wound in a spiral or longitudinally overlapping manner, and the winding overlap rate is 30% to 50% of the tape width.

10. A method for preparing a flexible thermal protection structure for sensor cables in a high-temperature testing device according to any one of claims 1 to 9, characterized in that, Includes the following steps: Bundle together the multiple sensor cables (1); The bundled sensor cables (1) are wrapped and fixed with a knitted stainless steel mesh to form an inner fastening covering layer (2). A flexible alumina fiber needled blanket is wrapped around the outside of the inner fastening covering layer (2) to form a flexible heat insulation layer (3). Outside the flexible heat insulation layer (3), a ceramic nanomaterial with a porous microstructure is coated to form a flexible heat insulation ceramic material layer (4). A polyimide film is coated on the outside of the flexible thermal insulation ceramic material layer (4) to form a flexible sealing layer (5). On the outside of the flexible sealing layer (5), glass fiber aluminum foil tape is wrapped around it so that the glass fiber aluminum foil tape covers the flexible sealing layer (5) to form the load-bearing solid layer (6).

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