Simulation method of honeycomb structure MXene / CNTs composite material with high wave absorbing performance

Abstract

The invention provides a simulation method of a honeycomb structure MXene / CNTs composite material with high wave absorbing performance, and belongs to the technical field of electromagnetic wave functional materials. The simulation method comprises two parts of modeling of the honeycomb structure MXene / CNTs composite material and structure optimization of the honeycomb structure MXene / CNTs composite material, CST Studio Suite electromagnetic field simulation software is adopted, a microwave studio (CST Microwave Studio) is used for modeling of the honeycomb structure composite material, the reflectivity and effective absorption bandwidth of the honeycomb structure composite material under 4-12 GHz are simulated, and therefore the wave absorbing performance of the honeycomb structure composite material is reflected, and the structure of the honeycomb structure MXene / CNTs composite material is optimized. The wave-absorbing coating thickness, the honeycomb aperture, the honeycomb thickness and other structural sizes of the honeycomb structure composite material are optimized, and the honeycomb structure MXene / CNTs composite material with the optimal wave-absorbing effect is obtained. According to the method, the honeycomb structure MXene / CNTs composite material is subjected to analogue simulation through CST Studio Suite, the simulation result is accurate, the operation is simple, and a theoretical basis can be provided for research on the wave absorbing performance of the actual honeycomb structure composite material.

Description

[0001] The present invention belongs to the technical field of electromagnetic functional materials, relates to electromagnetic wave absorbing materials, and specifically relates to a simulation method for a honeycomb structure MXene / CNTs composite material with high wave absorption performance. Background Art

[0002] With the rapid development of technology, electromagnetic wave absorbing materials are of great significance in military fields such as electromagnetic protection and stealth equipment, as well as in the national defense industry. Traditional wave absorbing materials, such as ferrites and magnetic metal particles, have been widely studied due to their high magnetic loss. However, these materials often have disadvantages such as high density, narrow wave absorption bandwidth, and easy corrosion, which limit their application and development. Therefore, microwave absorbing materials with strong absorption, wide bandwidth, lightweight, intelligent, and functional integration have become a research hotspot.

[0003] Microwave absorbing honeycomb materials have become an important development direction for stealth materials because of their light weight, high strength, and effective electromagnetic wave absorption ability. However, their complex preparation process and the easy shedding of the surface wave absorbing coating and other disadvantages make them have great limitations in practical applications. In this context, using advanced simulation technology to optimize the design of the honeycomb structure to improve its wave absorption performance has become a research hotspot in the fields of materials science and electromagnetics.

[0004] Simulation technology plays an important role in the research of wave absorbing honeycomb materials. Through simulation, the propagation and absorption characteristics of electromagnetic waves in the honeycomb structure can be accurately simulated, so that without actual preparation, potential high-performance material combinations and structural parameters can be quickly screened. CST simulation software, as a powerful electromagnetic simulation tool, is widely used in the research and design of the electromagnetic field. It can provide accurate electromagnetic field analysis, help researchers deeply understand the influence of different structural parameters on the wave absorption performance, and provide strong support for the optimization of the honeycomb structure.

[0005] In the research of honeycomb structures, the Nomex honeycomb structure has received extensive attention due to its unique performance advantages. The Nomex honeycomb structure has the characteristics of light weight, high strength, and high temperature resistance, and can meet the requirements of various application scenarios. However, the current research on the wave absorption performance of the Nomex honeycomb structure is still in the exploration stage, especially in terms of how to optimize its design through simulation technology, and there is still a large research space.

[0006] This patent focuses on the construction and structural optimization of the Nomex honeycomb structure (including the wave absorbing coating), uses CST simulation software for modeling and analysis, and gradually optimizes parameters such as the wave absorbing coating, honeycomb aperture, and honeycomb thickness to achieve the improvement of the wave absorption performance of the honeycomb structure. This research not only helps to promote the development of the simulation design technology of wave absorbing honeycomb materials, but also provides theoretical guidance and technical support for the preparation of high-performance wave absorbing materials in practical applications. Summary of the Invention

[0007] The purpose of the present invention is to provide a simulation method for a honeycomb-structured MXene / CNTs composite material with high wave absorption performance, so as to solve the problem that it is difficult to achieve high wave absorption performance due to the single loss mechanism of wave absorption materials and high reflectivity.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A simulation method for a honeycomb-structured MXene / CNTs composite material with high wave absorption performance includes two parts: modeling of the honeycomb-structured MXene / CNTs composite material and structural optimization of the honeycomb-structured MXene / CNTs composite material. It is characterized in that: after CST modeling of the honeycomb-structured MXene / CNTs composite material, gradient simulation is successively carried out on the thickness of the wave absorption material coating, the pore size of the Nomex honeycomb, and the thickness of the Nomex honeycomb, and its reflectivity is calculated, and the structural dimensions with excellent reflectivity are continuously iteratively screened to optimize the electromagnetic wave absorption performance of the honeycomb-structured MXene / CNTs composite material.

[0010] Preferably, the interface of the Nomex honeycomb unit is a regular hexagon, and the overall honeycomb is a periodic structure.

[0011] Preferably, the Nomex honeycomb-structured MXene / CNTs composite material consists of three parts: Nomex honeycomb paper, wave absorption material coating, and external air.

[0012] Preferably, when gradient optimization is carried out on the thickness of the wave absorption material coating, the honeycomb wall thickness, honeycomb pore size, and honeycomb thickness are controlled to be fixed, and the thickness of the wave absorption material coating is simulated with a gradient change of 0.005 mm.

[0013] Preferably, when gradient optimization is carried out on the pore size of the honeycomb, the honeycomb wall thickness, the thickness of the wave absorption material coating, and the honeycomb thickness are controlled to be fixed, and the pore size of the honeycomb is simulated with a gradient change of 0.5 mm.

[0014] Preferably, when gradient optimization is carried out on the thickness of the honeycomb, the honeycomb wall thickness, the thickness of the wave absorption material coating, and the honeycomb pore size are controlled to be fixed, and the thickness of the honeycomb is simulated with a gradient change of 2 mm.

[0015] Preferably, after gradient optimization of the thickness of the wave absorption material coating, the coating thickness with the best reflectivity is selected as the fixed value of the coating thickness when gradient optimization is carried out on the pore size of the honeycomb.

[0016] Preferably, after gradient optimization of the thickness of the wave-absorbing material coating and the honeycomb pore diameter, the coating thickness and honeycomb pore diameter with the best reflectivity are selected as the fixed values of the coating thickness and honeycomb pore diameter when performing gradient optimization on the honeycomb thickness.

[0017] Preferably, when calculating the reflectivity, the frequency range is set to 4 - 12 GHz, the background is air, and the boundary conditions are: Xmin: unit cell; Xmax: unit cell; Ymin: unit cell; Ymax: unit cell; Zmin: electric (Et = 0); Zmax: open (add space).

[0018] A simulation method for a honeycomb structure MXene / CNTs composite material with high wave-absorbing performance includes the following steps:

[0019] Step 1: Use the CST Studio Suite electromagnetic wave simulation software to model the honeycomb structure MXene / CNTs composite material. In the microwave studio, according to the actual honeycomb size, set the outer diameter of a single honeycomb to r1, and according to the actual honeycomb wall thickness, set the wall thickness of the honeycomb unit to t1 = 0.05 mm. The outer diameter of the wave-absorbing coating The thickness of the wave-absorbing coating is t2, and the honeycomb thickness is h, both in millimeters (mm), to obtain a single honeycomb structure unit.

[0020] Step 2: Initially set the honeycomb pore diameter r1 and honeycomb thickness h for the honeycomb structure unit in Step 1, with the wave-absorbing coating thickness t2 as the only variable to be controlled, and calculate the reflectivity and effective absorption bandwidth (EAB) of the honeycomb structure MXene / CNTs composite material with different wave-absorbing coating thicknesses.

[0021] Step 3: Take the wave-absorbing coating thickness t2 corresponding to the best reflectivity and EAB obtained in Step 2 as a fixed value, initially set the honeycomb thickness h, and calculate the reflectivity and effective absorption bandwidth (EAB) of the honeycomb structure MXene / CNTs composite material with different honeycomb pore diameters.

[0022] Step 4: Take the wave-absorbing coating thickness t2 and honeycomb pore diameter r1 corresponding to the best reflectivity and EAB obtained in Steps 2 and 3 as fixed values, and calculate the reflectivity and effective absorption bandwidth (EAB) of the honeycomb structure MXene / CNTs composite material with different honeycomb thicknesses, thereby obtaining the honeycomb structure MXene / CNTs composite material with the best wave-absorbing performance.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. By optimizing parameters such as the wave-absorbing coating, honeycomb aperture, and honeycomb thickness, the wave-absorbing performance of the honeycomb structure can be significantly improved, the wave-absorbing frequency band can be broadened, and effective electromagnetic wave absorption can be achieved within a wider frequency range.

[0025] 2. Using CST simulation software for modeling and analysis can accurately simulate the propagation and absorption characteristics of electromagnetic waves in the honeycomb structure. This enables the rapid screening of potential high-performance material combinations and structural parameters before actual preparation, avoiding a large number of experimental explorations, improving the design efficiency, and reducing the R & D cost.

[0026] 3. Through simulation optimization design, the number of experiments and material waste are reduced, thus reducing the R & D cost. At the same time, the optimized honeycomb structure wave-absorbing material can better meet the requirements in practical applications, improving the use value and economic benefits of the material.

[0027] 4. This invention provides a new method and technical means for the design of wave-absorbing honeycomb materials, which helps to promote the application expansion of wave-absorbing materials in multiple fields such as aerospace, electronic equipment, and military defense, and provides the possibility for realizing the lightweight, high-performance, and multifunctionalization of equipment. Brief Description of the Drawings

[0028] Figure 1 is a schematic diagram of the Nomex honeycomb structure unit in Embodiment 1 of the present invention;

[0029] Figure 2 is a diagram of the honeycomb structure unit constructed in CST in Embodiment 1 of the present invention;

[0030] Figure 3 is a schematic diagram of the boundary conditions of the periodic honeycomb structure constructed in CST in Embodiment 1 of the present invention;

[0031] Figure 4 is a reflectivity diagram of FW / MX / CNT-50 with different wave-absorbing coating thicknesses in Embodiment 1 of the present invention;

[0032] Figure 5 is a reflectivity diagram of FW / MX / CNT-50 with different honeycomb apertures in Embodiment 1 of the present invention;

[0033] Figure 6 is a reflectivity diagram of FW / MX / CNT-50 with different honeycomb thicknesses in Embodiment 1 of the present invention. Detailed Embodiments

[0034] The following further describes the present invention in detail with reference to the attached Figures 1-3 drawings and embodiments. The present invention is not limited to this embodiment.

[0035] Embodiment 1

[0036] As Figure 1 , Figure 2 , Figure 3 shown, a simulation method for a honeycomb-structured MXene / CNTs composite material with high microwave absorption performance includes two parts: modeling of the honeycomb-structured MXene / CNTs composite material and structural optimization of the honeycomb-structured MXene / CNTs composite material. After the honeycomb-structured MXene / CNTs composite material is modeled in the microwave studio of CST, the reflectivity is calculated by successively performing gradient simulations on the thickness of the microwave absorption material coating, the pore size of the Nomex honeycomb, and the thickness of the Nomex honeycomb. The structural dimensions with excellent reflectivity are continuously iteratively screened to optimize the electromagnetic wave absorption performance of the honeycomb-structured MXene / CNTs composite material.

[0037] A simulation method for a honeycomb-structured MXene / CNTs composite material with high microwave absorption performance includes the following steps:

[0038] Step 1: Use the CST Studio Suite electromagnetic wave simulation software to model the honeycomb-structured MXene / CNTs composite material. In the microwave studio, select a composite material (labeled MX / CNT-50) obtained by compounding MXene and CNTs with a diameter of 4 - 8 nm in a mass ratio of 1:1 as the microwave absorption coating. According to the actual honeycomb size, initially set the outer diameter of a single honeycomb to r1, and according to the actual honeycomb wall thickness, set the wall thickness of the honeycomb unit to t1 = 0.05 mm. The outer diameter of the microwave absorption coating The honeycomb thickness is h, and set the thickness of the microwave absorption coating to t2, with the unit being mm for all, to obtain a single honeycomb structure unit;

[0039] Step 2: Initially set the honeycomb pore size r1 = 3 mm and the honeycomb thickness h = 30 mm in the honeycomb structure unit obtained in Step 1 to control the only variable as the thickness t2 of the microwave absorption coating. Set the thickness of the microwave absorption coating at a gradient of 0.005 mm to t2 = 0.01, 0.015,..., 0.05 mm. Calculate the reflectivity and effective absorption bandwidth EAB of the honeycomb-structured MXene / CNTs composite material with different microwave absorption coating thicknesses;

[0040] Step 3: Take the thickness t2 = 0.025 mm of the microwave absorption coating corresponding to the best reflectivity and EAB obtained in Step 2 as a fixed value, initially set the honeycomb thickness h = 30 mm, and set the honeycomb pore size at a gradient of 0.5 mm to r1 = 1.5, 2,..., 4.5 mm. Calculate the reflectivity and effective absorption bandwidth EAB of the honeycomb-structured MXene / CNTs composite material with different honeycomb pore sizes;

[0041] Step 4: Take the absorber coating thickness t2 = 0.025 mm and honeycomb pore diameter r1 = 3 mm corresponding to the best reflectivity and EAB obtained in Steps 2 and 3 as fixed values, set the honeycomb thickness at a gradient of 2 mm as h = 10, 12,..., 40 mm, calculate the reflectivity and effective absorption bandwidth EAB of the honeycomb-structured MXene / CNTs composite with different honeycomb thicknesses, and then the honeycomb-structured MXene / CNTs composite with the best wave absorption performance can be obtained.

[0042] The above description is only for understanding the method and core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the rights of the present invention.

Claims

1. A simulation method for a honeycomb - structured MXene / CNTs composite with high microwave absorption performance, which includes two parts: the modeling of the honeycomb - structured MXene / CNTs composite and the structural optimization of the honeycomb - structured MXene / CNTs composite, is characterized in that: After the honeycomb structure MXene / CNTs composite material is modeled by CST, the reflectivity is calculated by successively performing gradient simulations on the thickness of the wave-absorbing material coating, the pore size of the Nomex honeycomb, and the thickness of the Nomex honeycomb, and the structural dimensions with excellent reflectivity are continuously iteratively screened to optimize the electromagnetic wave absorption performance of the honeycomb structure MXene / CNTs composite material.

2. The honeycomb structure MXene / CNTs composite material with high microwave absorption performance according to claim 1, characterized in that: The interface of the Nomex honeycomb unit is a regular hexagon, and the overall honeycomb is a periodic structure.

3. The honeycomb structure MXene / CNTs composite material with high microwave absorption performance according to claim 1, characterized in that: The Nomex honeycomb structure MXene / CNTs composite material consists of three parts, namely Nomex honeycomb paper, a wave-absorbing material coating, and the external air.

4. The honeycomb-structured MXene / CNTs composite material with high wave absorption performance according to claim 1, wherein: When performing gradient optimization on the thickness of the wave-absorbing material coating, the honeycomb wall thickness, honeycomb pore size, and honeycomb thickness are controlled to be fixed, and the thickness of the wave-absorbing material coating is simulated with a gradient change of 0.005 mm.

5. The honeycomb-structured MXene / CNTs composite material with high microwave absorption performance according to claim 1, characterized in that: When performing gradient optimization on the pore size of the honeycomb, the honeycomb wall thickness, the thickness of the wave-absorbing material coating, and the honeycomb thickness are controlled to be fixed, and the pore size of the honeycomb is simulated with a gradient change of 0.5 mm.

6. The honeycomb structure MXene / CNTs composite material with high microwave absorption performance according to claim 1, wherein: When performing gradient optimization on the thickness of the honeycomb, the honeycomb wall thickness, the thickness of the wave-absorbing material coating, and the honeycomb pore size are controlled to be fixed, and the thickness of the honeycomb is simulated with a gradient change of 2 mm.

7. The honeycomb structure MXene / CNTs composite material with high microwave absorption performance according to claim 1, characterized in that: After performing gradient optimization on the thickness of the wave-absorbing material coating, the coating thickness with the best reflectivity is selected as the fixed value of the coating thickness when performing gradient optimization on the pore size of the honeycomb.

8. The honeycomb-structured MXene / CNTs composite material with high wave absorption performance according to claim 1, wherein: After performing gradient optimization on the thickness of the wave-absorbing material coating and the honeycomb pore size, the coating thickness and honeycomb pore size with the best reflectivity are selected as the fixed values of the coating thickness and honeycomb pore size when performing gradient optimization on the honeycomb thickness.

9. The honeycomb structure MXene / CNTs composite material with high wave absorption performance according to claim 1, characterized in that: When calculating the reflectivity, the frequency range is set to 4 - 12 GHz, the background is air, and the boundary conditions are Xmin: unit cell; Xmax: unit cell; Ymin: unit cell; Ymax: unit cell; Zmin: electric (Et = 0); Zmax: open (add space).

10. The simulation method of the honeycomb-structured MXene / CNTs composite material with high wave absorption performance according to any one of claims 1 to 8, characterized in that It includes the following steps: Step 1: Use the CST Studio Suite electromagnetic wave simulation software to model the honeycomb structure MXene / CNTs composite material. In the microwave studio, according to the actual honeycomb size, set the outer diameter of a single honeycomb to r1. According to the actual honeycomb wall thickness, set the wall thickness of the honeycomb unit to t1 = 0.05 mm. The outer diameter of the absorbing coating is t2, and the honeycomb thickness is h, both in millimeters (mm), to obtain a single honeycomb structure unit; Step 2: Set the initial honeycomb pore size r1 = 3 mm and honeycomb thickness h = 30 mm in Step 1 to control the only variable as the thickness t2 of the wave-absorbing coating, and calculate the reflectivity and effective absorption bandwidth EAB of the honeycomb structure MXene / CNTs composite material with different thicknesses of the wave-absorbing coating. Step 3: Take the thickness t2 of the wave-absorbing coating corresponding to the best reflectivity and EAB obtained in Step 2 as a fixed value, set the honeycomb thickness h = 30 mm, and calculate the reflectivity and effective absorption bandwidth EAB of the honeycomb structure MXene / CNTs composite material with different honeycomb pore sizes. Step 4: Take the thickness t2 of the wave-absorbing coating and the honeycomb pore size r1 corresponding to the best reflectivity and EAB obtained in Steps 2 and 3 as fixed values, and calculate the reflectivity and effective absorption bandwidth EAB of the honeycomb structure MXene / CNTs composite material with different honeycomb thicknesses, and then the honeycomb structure MXene / CNTs composite material with the best wave-absorbing performance can be obtained.

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