Thermal-insulation stealth material and design method

Abstract

The application provides a heat-insulating stealth material and a design method, and the heat-insulating stealth material is obtained through steps of hierarchical division, material selection, double-gradient optimization of micro-morphology, iteration verification and the like. The application is based on the microstructure design of internal infrared extinction and wave-absorbing integrated collaborative doping, guides the development of a new type of heat-insulating material which can realize the maximum effective radar absorption bandwidth under the thickness constraint, and has excellent high-temperature infrared extinction capacity and good thermal insulation, can powerfully guide material preparation, realizes the dual purposes of broadband wave absorption and infrared extinction, and is expected to provide a new idea for the development of the next generation of high-efficiency heat-insulating compatible stealth materials.

Description

Technical Field

[0001] This invention relates to a thermal insulation and stealth material and its design method, particularly to a fiber-reinforced aerogel thermal insulation and stealth material and a multi-layer dual-gradient synergistic design method, belonging to the technical field of high-temperature thermal insulation functional materials. Background Technology

[0002] As aerospace technology advances towards higher flight speeds and longer flight durations, the demand for integrated high-efficiency thermal management and multi-spectral compatible stealth on the surface of aircraft under extreme aerodynamic and thermal environments is becoming increasingly urgent. On the one hand, materials need to achieve efficient thermal insulation in high-temperature environments through internal infrared extinction (i.e., efficiently absorbing and dissipating the infrared radiation energy they generate). On the other hand, they also need to possess broadband wave absorption capabilities in high-temperature environments. Aerogel materials, with their three-dimensional porous framework, high specific surface area, and low density, provide an ideal platform for constructing lightweight, thermally insulating, and electromagnetically functional integrated materials.

[0003] However, one of the current bottlenecks in the doping design of aerogel materials lies in the disconnect between "infrared extinction" and "radar wave absorption" properties. Specifically, most existing technologies and research focus on one of these two aspects: either using conventional micron-scale opacifiers to achieve infrared extinction, or using dielectric loss fillers to improve the radar absorption performance of the aerogel itself. No research has simultaneously considered the synergistic design of infrared radiation absorption and broadband electromagnetic signal absorption within the material.

[0004] However, the second bottleneck in the current design of doped aerogel materials is that existing technologies and research often focus on trying to improve a single infrared extinction index or broadband absorption index through continuous trial and error or screening. There is a lack of microscopic material design tools based on physical theories and laws to guide and verify the overall optimal and efficient heat insulation and wave absorption effect that the microscopic design scheme can achieve, and to directly compare the suitability and rationality of the application environment. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heat-insulating stealth material and design method based on the microstructure design of integrated infrared extinction and wave absorption within the material, thereby solving the bottleneck in the doping design of existing aerogel materials.

[0006] The technical solution of this invention: a heat-insulating stealth material and its design method, comprising the following steps:

[0007] Step S1: Hierarchical division.

[0008] Based on the environmental requirements for the use of thermal insulation and stealth materials, and according to the direction of temperature increase or decrease, the thermal insulation and stealth materials are divided into multiple thermal insulation and stealth co-working layers in the thickness direction. The thickness of the i-th thermal insulation and stealth co-working layer is D. i Temperature range is T i , i = 1, 2, ..., n, where n is the total number of thermal insulation and stealth synergy layers;

[0009] Step S2, Material Selection

[0010] The thermal insulation and stealth material uses aerogel as the matrix and fiber as the reinforcement. The fiber includes infrared extinction fiber and wave-absorbing fiber. Based on the temperature range of the thermal insulation and stealth synergy layer obtained in the first step of the layer division, the type of infrared extinction fiber of each thermal insulation and stealth synergy layer is determined.

[0011] Step S3: Microscopic morphology dual gradient optimization.

[0012] Step (3a): Design the microstructure of infrared extinction fibers to determine the arrangement, optimal diameter and optimal doping volume content of infrared extinction fibers in each thermal insulation and stealth synergy layer.

[0013] Step (3b) Microstructure design of microwave absorbing fibers: Determine the position and number of microwave absorbing fiber layers in the thermal insulation and stealth material. The microstructure of microwave absorbing fibers includes the intrinsic microstructure of the microwave absorbing fibers and the fiber dispersion form.

[0014] Step (3c): Based on the position of the absorbing fiber layer determined in step (3b), the absorbing fiber layer is set in the heat insulation and stealth synergy layer at that position, and the infrared extinction fiber layer is set in the remaining space. The infrared extinction fiber layer is set in the heat insulation and stealth synergy layer where there is no absorbing fiber layer.

[0015] Step S4, Iterative verification,

[0016] Based on the structure obtained from the dual gradient optimization of microstructure in step S3, the overall thermal conductivity and broadband absorption bandwidth of the thermal insulation stealth material are calculated and compared with the design specifications. If the design specifications are not met, return to S1 and repeat steps S1-S4 for iteration until the design specifications are met.

[0017] A thermal insulation stealth material, comprising a multi-layer structure consisting of multiple gradient thermal insulation stealth synergistic layers, wherein the thermal insulation stealth synergistic layers are determined by any of the design methods described above.

[0018] The beneficial effects of this invention compared to the prior art are as follows:

[0019] (1) Based on the microstructure design of the integrated synergistic doping of infrared extinction and wave absorption inside the material, this invention guides the development of a new type of heat insulation material that can achieve the maximum effective radar absorption bandwidth under thickness constraints, and has excellent high-temperature infrared extinction capability and good thermal insulation. It can strongly guide the preparation of materials and achieve the dual purpose of broadband wave absorption and infrared extinction. It is expected to provide new ideas for the development of next-generation high-efficiency heat insulation and stealth materials.

[0020] (2) This invention is geared towards lightweight applications. It adopts an integrated synergistic doping method of infrared extinction / wideband absorption, directly matching the application environment with the requirements and achieving reasonableness. It guides the development of a new type of heat insulation material that can achieve the maximum effective radar absorption bandwidth under thickness constraints, and has excellent high-temperature infrared extinction capability and good thermal insulation.

[0021] (3) This invention breaks through the limitations of traditional single-function design of aerogel materials and proposes a material microstructure design idea of ​​"multi-layer dual-gradient collaborative design". Starting from the hard constraints of the final application environment (temperature, thickness, stealth bandwidth), it carries out target-oriented reverse design and iterative optimization to ensure that the developed material design meets the usage requirements from the beginning.

[0022] (4) This invention improves the efficiency and success rate of material design, transforming the original trial-and-error process that relied solely on experience into a rational design process that is calculable, predictable, and optimizable, significantly shortening the R&D cycle and reducing development costs and failure risks.

[0023] (5) This invention gives the material customizability. By adjusting the input environmental parameters (such as operating temperature range, thickness constraints, and stealth frequency band requirements), different microstructure design schemes can be flexibly output to meet the diverse and customized application scenario requirements.

[0024] (6) The present invention ensures the stability of the material at high temperatures and in the working environment. The fiber type with matching temperature resistance is selected according to the layer temperature (such as SiC fiber used on the high temperature side), which ensures the structural stability and functional durability of the material in harsh thermal environments. Attached Figure Description

[0025] Figure 1 This is a flowchart of the present invention;

[0026] Figure 2 The typical implementation scheme of this invention achieves a wideband reflection loss curve (the reflection loss curve of the material in the 2-18GHz frequency range is achieved by using dielectric-magnetic combined loss in the 5 layers near the cold end and dielectric loss in the 10 layers near the hot end to achieve wideband wave absorption). Detailed Implementation

[0027] The present invention is as follows Figure 1As shown, a multilayer dual-gradient synergistic design method for fiber-reinforced aerogel thermal insulation stealth materials is provided, including the following steps:

[0028] Step S1: Hierarchical division.

[0029] In this step, based on the environmental requirements for the use of the thermal insulation stealth material and according to the direction of temperature increase or decrease, the thermal insulation stealth material is divided into multiple thermal insulation stealth co-working layers in the thickness direction. The thickness of the i-th thermal insulation stealth co-working layer is D. i Temperature range is T i , i = 1, 2, ..., n, where n is the total number of thermal insulation and stealth synergy layers.

[0030] Furthermore, during the use of the thermal insulation and stealth material in this step, the internal temperature changes along the thickness direction, from the high-temperature side temperature T... 高 Temperature T on the low-temperature side 低 Decreasing, the thickness is divided into several temperature zones T according to the linear temperature change. i The sum of the thicknesses of all temperature zones equals the total thickness D of the thermal insulation stealth material.

[0031] Furthermore, in this step, the stratification is carried out using either uniform or non-uniform temperature distribution. Uniform temperature distribution means that the temperature range of each stratum is consistent, while non-uniform temperature distribution means that the temperature ranges of each stratum are uneven from the high-temperature side to the low-temperature side.

[0032] Further optimization involves dividing the thermal insulation and stealth synergy layer into 5 to 30 layers in this step.

[0033] Step S2: Material selection.

[0034] In this step, the thermal insulation and stealth material uses aerogel as the matrix and fibers as the reinforcement. The fibers include infrared extinction fibers and microwave absorption fibers. Based on the temperature range of the thermal insulation and stealth synergy layer obtained from the first step of layer division, the type of infrared extinction fiber in each thermal insulation and stealth synergy layer is determined.

[0035] Furthermore, in this step, the type of infrared extinction fiber for each layer of thermal insulation and stealth synergy layer is determined based on the upper limit temperature of the temperature range of each layer and the temperature resistance of the material.

[0036] Furthermore, this step also includes determining the type of aerogel, based on the maximum operating temperature of the thermal insulation and stealth material and the temperature resistance of the aerogel.

[0037] Step S3: Microscopic morphology dual gradient optimization.

[0038] Based on the optimization calculation of extinction morphology, the principle of minimizing the equivalent thermal conductivity of a single layer, and the overall performance optimization calculation of the cloaking layer, gradient-optimized micromorphology data of each layer are obtained.

[0039] This step includes:

[0040] Step (3a): Design the microstructure of infrared extinction fibers, and determine the arrangement, optimal diameter and optimal doping volume content of infrared extinction fibers in each heat insulation and stealth synergy layer.

[0041] Specifically, the steps include the following:

[0042] (1) The infrared extinction fibers are arranged in a plane random arrangement perpendicular to the heat flow in the microscopic arrangement, that is, they are laid out in the direction of thickness to form an infrared extinction fiber layer.

[0043] (2) Using the average temperature of the i-th layer and the optical parameters of the infrared extinction fiber, with the diameter of the infrared extinction fiber as the optimization variable and the best extinction effect as the optimization objective, determine the optimal diameter d of the infrared extinction fiber in the i-th layer. i .

[0044] Furthermore, the optical parameters of the infrared extinction fiber in this step refer to the complex refractive index of the material, which includes both real and imaginary parts. This is a property of the fiber itself and can be obtained based on the type of infrared extinction fiber determined in step S2.

[0045] Furthermore, the optimal extinction effect in this step is characterized by maximizing the extinction coefficient, which is obtained based on existing calculation methods such as the infinitely long Mie electromagnetic scattering method and the Rossland averaging method for the average temperature radiation of the current layer.

[0046] (3) Using the doping volume content of the infrared extinction fiber in the i-th layer as the optimization variable and the minimum equivalent thermal conductivity of a single layer as the optimization objective, the optimal doping volume content of the infrared extinction fiber in the i-th layer is determined.

[0047] Furthermore, in this step, the minimum equivalent thermal conductivity of a single layer is characterized by the minimum sum of radiative thermal conductivity and thermal conductivity, which is calculated based on existing heat transfer models and the average temperature of each layer.

[0048] Step (3b) Microstructure design of microwave absorbing fibers: Determine the position and number of microwave absorbing fiber layers in the thermal insulation and stealth material. The microstructure of microwave absorbing fibers includes the intrinsic microstructure of the microwave absorbing fibers and the fiber dispersion form.

[0049] Specifically, the following steps are included:

[0050] (1) The microwave absorbing fibers are arranged in the thickness direction of the thermal insulation stealth material in the form of microwave absorbing fiber layers.

[0051] (2) Using the thickness of each absorbing fiber layer, electromagnetic parameters, spacing between adjacent absorbing fiber layers and number of absorbing fiber layers as optimization parameters, and taking the wavelength maximization of reflectivity index as the optimization objective, impedance matching design is carried out on the absorbing fiber layer to determine the number of absorbing fiber layers, spacing between adjacent absorbing fiber layers, thickness of each absorbing fiber layer and electromagnetic parameters.

[0052] Furthermore, in this step, the thickness of each absorbing fiber layer is constrained to 0.1mm to 0.3mm, the number of absorbing fiber layers is constrained to [1,n], the spacing between adjacent absorbing fiber layers is constrained to (0,D), and the electromagnetic parameters are reasonably constrained based on the existing absorbing fibers.

[0053] (3) Based on the number of microwave absorbing fiber layers, the spacing between adjacent microwave absorbing fiber layers and the thickness of each microwave absorbing fiber layer determined in step (2), determine the number of microwave absorbing fiber layers in the thermal insulation and stealth synergy layer divided in step S1.

[0054] (4) Based on the electromagnetic parameters of the absorbing fiber layer determined in step (2) and the thermal insulation and stealth synergy layer distributed thereon, the electrical performance of the absorbing fiber layer and the microstructure of the absorbing fiber is designed to obtain the type of absorbing fiber layer and the microstructure of the absorbing fiber that meet the electromagnetic parameters and temperature resistance performance.

[0055] Furthermore, in this step, the microstructure of the absorbing fiber is determined by experimental screening and empirical trial and error methods, and the test index is to meet the electromagnetic parameters determined in step (2).

[0056] Step (3c): According to the heat insulation and stealth synergy layer where the absorbing fiber layer is located as determined in steps (3b) and (3), the absorbing fiber layer is set in the heat insulation and stealth synergy layer, and the infrared extinction fiber layer is set in the remaining space. The infrared extinction fiber layer is set in the heat insulation and stealth synergy layer where there is no absorbing fiber layer.

[0057] The present invention achieves the microscopic synergistic distribution of wave absorption and light extinction functions through the dual gradient optimization of microscopic morphology in step S3.

[0058] Step S4: Iterative verification.

[0059] Based on the microstructure data of each layer obtained in step S3, the thermal conductivity and broadband absorption bandwidth of the thermal insulation stealth material are calculated and compared with the design specifications. If the design specifications are not met, return to S1 and repeat steps S1-S4 for iteration until the design specifications are met.

[0060] Furthermore, the parameters used in this iteration include the number of layers and fiber type in step S1.

[0061] Furthermore, the present invention also provides a fiber-reinforced aerogel thermal insulation stealth material, which has a multi-layer structure composed of multiple thermal insulation stealth synergistic layers, the thermal insulation stealth synergistic layers being determined by the above-mentioned dual-gradient synergistic design method.

[0062] The present invention will be further described below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0063] 1. Goal setting:

[0064] The high-temperature side has a temperature of 1000℃, the low-temperature side has a temperature of 100℃, and the total thickness is 15mm.

[0065] After the material design is completed, it must meet the following indicators:

[0066] Stealth performance: Within the 2-18 GHz range, the effective absorption bandwidth EAB is ≥8 GHz with a reflectivity ≤ -10 dB. Thermal conductivity under this temperature gradient condition is ≤0.035 W·m. -1 ·K -1 .

[0067] 2. Execute the design method

[0068] Step S1: Divide the 15mm thick material into 15 layers evenly along the heat flow direction. That is, each layer is 1mm thick, with a temperature range of 60℃, and layer temperatures of 1000℃-940℃, 940℃-880℃, ..., 160℃-100℃.

[0069] Step S2:

[0070] Aerogel matrix: In this example, the silica aerogel matrix meets the temperature resistance requirements, so silica aerogel can be selected.

[0071] Infrared matting fiber: Quartz fiber meets the temperature resistance requirements, so quartz fiber is selected.

[0072] Step S3:

[0073] S3a, Infrared Extinction Optimization: The average layer temperatures of the 15 layers are 940℃, 910℃, 850℃, 790℃, 730℃, 670℃, 610℃, 550℃, 490℃, 430℃, 370℃, 310℃, 250℃, 190℃, and 130℃. Based on Mie theory and Roselland average calculations, the optimal diameters of the alumina extinction fibers in this layer are determined to be 4.04μm, 4.06μm, 4.10μm, 4.14μm, 4.20μm, 4.26μm, and 4. The fiber thicknesses were 34 μm, 4.44 μm, 4.54 μm, 4.64 μm, 4.76 μm, 4.92 μm, 5.10 μm, 5.22 μm, and 5.30 μm. Through optimization using equivalent thermal conductivity, the fiber volume fractions for each layer were determined to be 14.73%, 14.72%, 14.64%, 14.49%, 14.24%, 13.90%, 13.48%, 12.95%, 12.32%, 11.57%, 10.72%, 9.76%, 8.66%, 7.44%, and 6.08%.

[0074] S3b. Absorption Optimization: Impedance matching design using the gradient descent method and Adam optimizer was employed to achieve broadband absorption. Ultimately, 15 layers of absorbing fiber were embedded, each with a thickness of 0.2 mm. The 10 layers closest to the hot side utilize dielectric loss, while the 5 layers closest to the cold side employ a combination of magnetic and dielectric losses. The interlayer spacing of the absorbing fiber (from hot to cold side) is: 0.940 mm, 0.940 mm, 0.940 mm, 0.940 mm, 0.939 mm, 0.866 mm, 0.784 mm, 0.785 mm, 0.785 mm, 0.785 mm, 0.785 mm, 0.785 mm, 0.785 mm, 0.786 mm. The optimized electromagnetic parameter values ​​are used to guide the micro-design of the absorbing fiber layer. For example, the 6th layer (high temperature region) requires strong dielectric loss, and the design parameters are a dielectric constant with a real part of 9.18 and an imaginary part of 5.88; the 14th layer (low temperature region) requires a combination of magnetic loss and dielectric loss, and the design parameters are a dielectric constant (real part 3.81, imaginary part 4.59) and a permeability (real part 1.93, imaginary part 1.56).

[0075] Absorbing fibers: Considering the temperature resistance requirements and electromagnetic parameter requirements of the overall material application environment, the 10 layers near the high temperature side use SiC fibers with different aspect ratios, and the conductive network is used to approach the target design parameters by dielectric loss; the 5 layers near the cold side use ceramic-coated modified short carbon fibers that are uniformly dispersed, and the magnetic loss and dielectric loss are used in synergy to approach the target design parameters.

[0076] S3c: Based on the position of the absorbing fiber layer determined in step (3b), the absorbing fiber layer is set in the heat insulation and stealth synergy layer, and the remaining space is used to set the infrared extinction fiber layer.

[0077] Step S4: Perform performance simulation on the overall design scheme to evaluate whether it meets the requirements.

[0078] First iteration: Under this gradient condition, the overall thermal conductivity is <0.035 W / (m·K), and the effective absorption bandwidth EAB = 14.09 with reflectivity ≤-10 dB in the 2-18 GHz range is better than the design target and meets the requirements. Figure 2 As shown.

[0079] This embodiment demonstrates that a multi-layered dual-gradient collaborative design method provides an integrated material microstructure design scheme that combines excellent thermal insulation performance, wide-band radar stealth capability, and lightweight characteristics. This method effectively transforms macroscopic requirements into executable microscopic fabrication process parameters.

[0080] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

[0081] The parts of this invention not described in detail are techniques known to those skilled in the art.

Claims

1. A design method for a heat-insulating stealth material, characterized in that, Includes the following steps: Step S1: Hierarchical division. Based on the environmental requirements for the use of thermal insulation and stealth materials, and according to the direction of temperature increase or decrease, the thermal insulation and stealth materials are divided into multiple thermal insulation and stealth co-working layers in the thickness direction. The thickness of the i-th thermal insulation and stealth co-working layer is D. i Temperature range is T i , i = 1, 2, ..., n, where n is the total number of thermal insulation and stealth synergy layers; Step S2, Material Selection The thermal insulation stealth material uses aerogel as the matrix and fibers as the reinforcement. The fibers include infrared extinction fibers and wave-absorbing fibers. Based on the temperature range of the thermal insulation stealth synergy layer obtained from the first step of layer division, the type of infrared extinction fibers in the thermal insulation stealth synergy layer is determined. Step S3: Microscopic morphology dual gradient optimization. Step (3a): Design the microstructure of infrared extinction fibers to determine the arrangement, optimal diameter and optimal doping volume content of infrared extinction fibers in each thermal insulation and stealth synergy layer. Step (3b) Microstructure design of microwave absorbing fibers: Determine the position and number of microwave absorbing fiber layers in the thermal insulation and stealth material. The microstructure of microwave absorbing fibers includes the intrinsic microstructure of the microwave absorbing fibers and the fiber dispersion form. Step (3c): Based on the position of the absorbing fiber layer determined in step (3b), the absorbing fiber layer is set in the heat insulation and stealth synergy layer at that position, and the infrared extinction fiber layer is set in the remaining space. The infrared extinction fiber layer is set in the heat insulation and stealth synergy layer where there is no absorbing fiber layer. Step S4, Iterative verification, Based on the structure obtained from the dual gradient optimization of microstructure in step S3, the thermal conductivity and broadband absorption bandwidth of the thermal insulation stealth material are calculated and compared with the design specifications. If the design specifications are not met, return to S1 and repeat steps S1-S4 for iteration until the design specifications are met.

2. The design method for a thermal insulation stealth material according to claim 1, characterized in that: Step (3a) includes, (1) The infrared extinction fibers are arranged in a random manner perpendicular to the heat flow plane in the microscopic arrangement, that is, they are laid out in the infrared extinction fiber layer in the direction of thickness. (2) Using the average temperature of the i-th layer and the optical parameters of the infrared extinction fiber, with the diameter of the infrared extinction fiber as the optimization variable and the best extinction effect as the optimization objective, determine the optimal diameter d of the infrared extinction fiber in the i-th layer. i ; (3) Using the doping volume content of the infrared extinction fiber in the i-th layer as the optimization variable and the minimum equivalent thermal conductivity of a single layer as the optimization objective, the optimal doping volume content of the infrared extinction fiber in the i-th layer is determined.

3. The design method for a thermal insulation stealth material according to claim 2, characterized in that: Step (3b) includes, (1) The microwave absorbing fibers are arranged in the thickness direction of the thermal insulation stealth material in the form of microwave absorbing fiber layers; (2) Using the thickness of each absorbing fiber layer, electromagnetic parameters, spacing between adjacent absorbing fiber layers and number of absorbing fiber layers as optimization parameters, and taking the wavelength maximization of reflectivity index as the optimization objective, impedance matching design is carried out on the absorbing fiber layer to determine the number of absorbing fiber layers, spacing between adjacent absorbing fiber layers, thickness of each absorbing fiber layer and electromagnetic parameters. (3) Based on the number of microwave absorbing fiber layers, the spacing between adjacent microwave absorbing fiber layers and the thickness of each microwave absorbing fiber layer determined in step (2), determine the number of microwave absorbing fiber layers in the thermal insulation and stealth synergy layer divided in step S1. (4) Based on the electromagnetic parameters of the absorbing fiber layer determined in step (2) and the thermal insulation and stealth synergy layer distributed thereon, the electrical performance of the absorbing fiber layer and the microstructure of the absorbing fiber is designed to obtain the type of absorbing fiber layer and the microstructure of the absorbing fiber that meet the electromagnetic parameters and temperature resistance performance.

4. The design method for a heat-insulating stealth material according to claim 3, characterized in that: In steps (3a) and (2), the optical parameters of the infrared extinction fiber are the complex refractive index of the fiber material, which includes the real part and the imaginary part. The best extinction effect is characterized by maximizing the extinction coefficient. In steps (3a) and (3), the minimum equivalent thermal conductivity of a single layer is characterized by the minimum sum of radiative thermal conductivity and thermal conductivity.

5. The design method for a thermal insulation stealth material according to claim 4, characterized in that: In steps (3b)(2), the thickness of each absorbing fiber layer is constrained to 0.1mm to 0.3mm, the number of absorbing fiber layers is constrained to [1,n], the spacing between adjacent absorbing fiber layers is constrained to (0,D), and the electromagnetic parameters are reasonably constrained based on the existing absorbing fibers. In steps (3b) and (4), the microstructure of the absorbing fiber is determined by experimental screening and empirical trial-and-error methods, and the test index is to meet the electromagnetic parameters determined in step (3b) and (2).

6. The design method for a thermal insulation stealth material according to claim 5, characterized in that: In step S1, during the use of the thermal insulation stealth material, the internal temperature changes linearly with the thickness direction, from the high-temperature side temperature T... 高 Temperature T on the low-temperature side 低 Decreasing, the thickness is divided into several temperature zones T according to temperature changes. i The sum of the thicknesses of all temperature zones equals the total thickness D of the thermal insulation stealth material. or In step S1, the stratification is carried out by temperature equalization or non-equalization. Temperature equalization means that the temperature range of each layer is the same, while temperature non-equalization means that the temperature ranges of each layer are not uniform from the high temperature side to the low temperature side.

7. The design method for a thermal insulation stealth material according to claim 6, characterized in that: In step S1, the thermal insulation and stealth synergy layer is divided into 5 to 30 layers.

8. The design method for a thermal insulation stealth material according to claim 7, characterized in that: In step S2, the type of infrared extinction fiber for each layer of thermal insulation and stealth synergy layer is determined based on the upper limit temperature of the temperature range of each layer of thermal insulation and stealth synergy layer and the temperature resistance of the material. Step S2 also includes determining the type of aerogel, which is determined based on the maximum operating temperature of the thermal insulation and stealth material and the temperature resistance of the aerogel.

9. The design method for a thermal insulation stealth material according to claim 8, characterized in that: In step S4, the parameters for iteration include the number of layers and fiber type from step S1.

10. A heat-insulating stealth material, characterized in that: A multi-layer structure consisting of multiple thermal insulation and stealth synergy layers, wherein the thermal insulation and stealth synergy layers are determined by the design method described in any one of claims 1-9.

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