CN112209733B - Carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and preparation method thereof - Google Patents
Carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, wherein the honeycomb metamaterial adopts carbon nano tubes and photosensitive resin as slurry, then a three-dimensional full-wave electromagnetic field simulation technology is utilized to simulate and simulate a metamaterial structure, and then a photocuring printing technology SLA is adopted to print the slurry in a real object; finally, calcining in nitrogen atmosphere to obtain the carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial with the honeycomb structure. The preparation method can effectively reduce the technical difficulty and the raw material cost of preparing the metamaterial wave-absorbing structure by 3D printing, and avoid the cost improvement caused by unnecessary raw material use; the firmness of the contact point of the periodic metamaterial wave-absorbing structure and the accuracy of the contact point can be improved on the basis of considering the functionality of the metamaterial wave-absorbing agent, and the cycle of additive manufacturing is shortened; the prepared honeycomb metamaterial wave absorbing material has an ultra-wide effective electromagnetic wave absorbing frequency band within the range of 2-18 GHz.
Description
Technical Field
The invention belongs to the field of electromagnetic wave absorbing materials, and particularly relates to a carbon nano tube-based broadband electromagnetic wave absorbing honeycomb metamaterial and a preparation method thereof.
Background
At present, the implementation process of the metamaterial wave absorbing device for absorbing broadband electromagnetic waves at home and abroad mainly has two types of wave absorbing devices with different advantages, but the wave absorbing device has obvious problems. One of the means is to realize broadband electromagnetic wave absorption in the concerned frequency range mainly through the combination of the 3D printing layered structure, and the main problem is that the design and the preparation of the multi-layer structure not only can improve the difficulty of additive manufacturing, but also can greatly increase the consumption and the cost of printing raw materials. Taking a research paper with the title of 'a structural broadband wave-absorbing metamaterial based on a 3D printing technology' (DOI: 10.7498/aps.67.20172262) as an example, the three-layer broadband wave-absorbing material is designed, wherein a surface layer and a middle layer are of periodic array structures with different unit sizes, a bottom layer is of a wave-absorbing flat plate structure, and the wave-absorbing material is successfully prepared by adopting the 3D printing technology as an overall material. Although the wave-absorbing material can realize electromagnetic wave response in a wider frequency range by superposition of absorption bandwidths generated by the multilayer structure, the multilayer superposition printing method can increase the consumption of printing raw materials and the manufacturing cost of products while improving the manufacturing difficulty of the additive; on the other hand, different element superposition designs can effectively widen the frequency response range of the composite wave-absorbing material, but multiple superposition of frequency bands can cause wasteful use of printing raw materials and increase of cost. Although the amount of raw materials used can be reduced by improving the printing precision of the printer and optimizing the structural design, the cost of the material is still far higher than that of the periodic metamaterial structure wave absorber. The other means is to form a periodic metamaterial wave-absorbing structure by sticking the wave-absorbing unit structure, and the obvious problem of the design is that the periodic array structure is covered on the skin by sticking, so that on one hand, the firmness of a bonding interface and the accuracy of bonding sites cannot be ensured, and on the other hand, the time cost required for preparation can be greatly increased. Taking a patent entitled "technology for manufacturing pyramid honeycomb structure wave-absorbing material" (technical number: 15855122) as an example, the method uses a cladding plate honeycomb wave-absorbing material to cut into specific pyramid shapes, each four pyramid shapes are bonded into a regular tetrahedral pyramid structure by using an adhesive, and pyramid shapes are bonded on a wave-absorbing honeycomb plate with a surface covered by a skin according to a matrix, so that a periodic honeycomb metamaterial wave-absorbing device is obtained. The main problem with the manner of adhesive attachment is that the firmness between the covering skin and the pyramoid and the consistency of the different adhesive contact points are not guaranteed, and the preparation cycle is much longer than that of the advanced additive manufacturing process. Although the robustness between the covering skin and the pyramids and the consistency of the different attachment points can be improved by machine instruction operations, the preparation cycle is still much longer than for additive manufacturing. Currently, the following technical problems need to be solved in the art: 1. the technical difficulty and the raw material cost of the metamaterial wave-absorbing structure prepared by 3D printing are reduced, and the cost improvement caused by unnecessary raw material use is avoided. 2. On the basis of considering the functionality of the metamaterial wave absorber, the firmness of contact points of the periodic metamaterial wave absorbing structure and the accuracy of contact points are improved, and meanwhile, the cycle of additive manufacturing is shortened.
Disclosure of Invention
The invention provides a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial comprises the following steps:
step 1, according to the dosage ratio of the carbon nano tube to the photosensitive resin of 1-5g:200 Uniformly dispersing the carbon nano tube in the photosensitive resin through a dispersing machine, and obtaining the light-cured printing slurry when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of the dispersing machine;
step 2, simulating a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology, wherein the specific simulation steps are as follows: adopting CST studio unit 2014 simulation software, taking a perfect conductor PEC as a substrate, firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 2-8mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 2-11mm, the sum of the height a of the base and the height b of each right triangle is less than or equal to 13mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; a plurality of honeycomb units are periodically arranged and connected according to a honeycomb-like structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained;
step 3, taking the honeycomb metamaterial structure obtained through simulation in the step 3 as a pre-printing model, and performing physical printing preparation on the slurry obtained in the step 1 by adopting a photo-curing printing technology SLA;
and 4, calcining the printed matter in a nitrogen atmosphere to obtain the carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial with the honeycomb structure.
In the step 2, the sum of the heights of the base a and the right triangle b of the honeycomb unit is 11 mm.
In the step 2, the height a of the base is 6mm, and the height b of the right triangle is 5 mm.
In the step 4, the heating rate is 1-3 ℃/min, the calcining temperature is 330-370 ℃ and the calcining time is 3h.
The carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial prepared by the method.
The beneficial effects are that:
the preparation method can effectively reduce the technical difficulty and the raw material cost of preparing the metamaterial wave-absorbing structure by 3D printing, and avoid the cost improvement caused by unnecessary raw material use; the firmness of the contact point of the periodic metamaterial wave-absorbing structure and the accuracy of the contact point can be improved on the basis of considering the functionality of the metamaterial wave-absorbing agent, and the cycle of additive manufacturing is shortened; the prepared honeycomb metamaterial wave-absorbing material has an ultra-wide effective electromagnetic wave absorption frequency range within the range of 2-18 GHz, and can be directly used as a wave-absorbing substrate, or the electromagnetic wave-absorbing function of the honeycomb metamaterial wave-absorbing material is integrated into a target substrate in an integrated mode, so that the stealth or wave-absorbing function of the target material is realized.
Drawings
Fig. 1, a simulated honeycomb metamaterial structure and a reflectivity chart (a is a simulated honeycomb structure, b is a honeycomb unit structure, c is a right triangle structure schematic diagram on a base, and d is a reflectivity chart).
Fig. 2, 3D are pictorial representations of printed honeycomb metamaterials.
Fig. 3, a physical diagram of a honeycomb metamaterial after heat treatment.
Fig. 4, top view of 3D printed honeycomb metamaterial.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Example 1
The invention relates to a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, comprising the following steps:
step 1, carbon nanotubes and photosensitive resin according to 1g:200 Uniformly mixing the ratio of the mL, and taking the mixture as the slurry for the subsequent photo-curing printing when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of a dispersing machine;
step 2, modeling a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology (CST studio unit 2014), taking a perfect conductor PEC as a substrate, and firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 6mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 5mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; and then, a plurality of honeycomb units are periodically arranged and connected according to the imitated honeycomb structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained.
And 3, performing physical printing preparation on the printed metamaterial structure by adopting a photo-curing printing technology SLA.
And 4, calcining the obtained real object in a nitrogen atmosphere, heating to 350 ℃ at a speed of 1 ℃/min, and calcining at a temperature of 350 ℃ for 3h to obtain the required honeycomb metamaterial.
Fig. 1 is a graph of the honeycomb metamaterial structure and reflectivity simulated by the simulation. It can be seen from fig. 1a-c that the simulated honeycomb structure is slightly different from the conventional honeycomb structure, and that the tip structure is formed on every three adjacent honeycomb units to enhance multiple reflection and loss of electromagnetic waves inside the structure. The reflectivity simulation result in fig. 1d shows that when a=6 and b=5, the honeycomb metamaterial has a very wide effective electromagnetic response frequency band, and the electromagnetic wave absorption rate reaches 79.3%.
Fig. 2 is a diagram of a 3D printed honeycomb metamaterial absorber. As can be seen from fig. 2, the structure of the 3D printed honeycomb metamaterial wave absorber is completely consistent with the structure optimized by simulation, and the wave absorber has no obvious defects. The whole structure can be finished by printing only once without extra pasting steps, the firmness of contact points and the accuracy of contact points of the periodic metamaterial wave-absorbing structure are improved on the basis of considering the functionality of the metamaterial wave-absorbing agent, and meanwhile, the cycle of additive manufacturing is shortened.
Fig. 3 is a diagram of a honeycomb metamaterial wave absorber after heat treatment. As can be seen from fig. 3, the honeycomb wave absorber after heat treatment has no obvious air holes and cracks, and the wave absorber is integrally designed in a single layer, only the designed honeycomb metamaterial unit is required to be printed periodically, so that the difficulty of the printing technology is effectively reduced, the printing cost is saved, and the waste caused by unnecessary use of raw materials is avoided.
Example 2
The invention relates to a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, comprising the following steps:
step 1, carbon nanotubes and photosensitive resin according to 1g:200 Uniformly mixing the ratio of the mL, and taking the mixture as the slurry for the subsequent photo-curing printing when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of a dispersing machine;
step 2, modeling a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology (CST studio unit 2014), taking a perfect conductor PEC as a substrate, and firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 3mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 8mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; and then, a plurality of honeycomb units are periodically arranged and connected according to the imitated honeycomb structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained. The reflectivity simulation results show that when a=3 and b=8, the honeycomb metamaterial has a very wide effective electromagnetic wave response frequency band, and the electromagnetic wave absorptivity reaches 68.3%.
And 3, performing physical printing preparation on the printed metamaterial structure by adopting a photo-curing printing technology SLA.
And 4, calcining the obtained real object in a nitrogen atmosphere, heating to 350 ℃ at a speed of 1 ℃/min, and calcining at a temperature of 350 ℃ for 3h to obtain the required honeycomb metamaterial.
Example 3
The invention relates to a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, comprising the following steps:
step 1, carbon nanotubes and photosensitive resin according to 1g:200 Uniformly mixing the ratio of the mL, and taking the mixture as the slurry for the subsequent photo-curing printing when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of a dispersing machine;
step 2, modeling a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology (CST studio unit 2014), taking a perfect conductor PEC as a substrate, and firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 4mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 7mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; and then, a plurality of honeycomb units are periodically arranged and connected according to the imitated honeycomb structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained. The reflectivity simulation results show that when a=4 and b=7, the honeycomb metamaterial has a very wide effective electromagnetic wave response frequency band, and the electromagnetic wave absorptivity reaches 72.4%.
And 3, performing physical printing preparation on the printed metamaterial structure by adopting a photo-curing printing technology SLA.
And 4, calcining the obtained real object in a nitrogen atmosphere, heating to 350 ℃ at a speed of 1 ℃/min, and calcining at a temperature of 350 ℃ for 3h to obtain the required honeycomb metamaterial.
Example 4
The invention relates to a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, comprising the following steps:
step 1, carbon nanotubes and photosensitive resin according to 1g:200 Uniformly mixing the ratio of the mL, and taking the mixture as the slurry for the subsequent photo-curing printing when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of a dispersing machine;
step 2, modeling a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology (CST studio unit 2014), taking a perfect conductor PEC as a substrate, and firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 5mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 6mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; and then, a plurality of honeycomb units are periodically arranged and connected according to the imitated honeycomb structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained. The reflectivity simulation results show that when a=5 and b=6, the honeycomb metamaterial has a very wide effective electromagnetic wave response frequency band, and the electromagnetic wave absorptivity reaches 76.7%.
And 3, performing physical printing preparation on the printed metamaterial structure by adopting a photo-curing printing technology SLA.
And 4, calcining the obtained real object in a nitrogen atmosphere, heating to 350 ℃ at a speed of 1 ℃/min, and calcining at a temperature of 350 ℃ for 3h to obtain the required honeycomb metamaterial.
Example 5
The invention relates to a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, comprising the following steps:
step 1, carbon nanotubes and photosensitive resin according to 1g:200 Uniformly mixing the ratio of the mL, and taking the mixture as the slurry for the subsequent photo-curing printing when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of a dispersing machine;
step 2, modeling a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology (CST studio unit 2014), taking a perfect conductor PEC as a substrate, and firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 7mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 4mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; and then, a plurality of honeycomb units are periodically arranged and connected according to the imitated honeycomb structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained. The reflectivity simulation results show that when a=7 and b=4, the honeycomb metamaterial has a very wide effective electromagnetic wave response frequency band, and the electromagnetic wave absorptivity reaches 70.9%.
And 3, performing physical printing preparation on the printed metamaterial structure by adopting a photo-curing printing technology SLA.
And 4, calcining the obtained real object in a nitrogen atmosphere, heating to 350 ℃ at a speed of 1 ℃/min, and calcining at a temperature of 350 ℃ for 3h to obtain the required honeycomb metamaterial.
Example 6
The invention relates to a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, comprising the following steps:
step 1, carbon nanotubes and photosensitive resin according to 1g:200 Uniformly mixing the ratio of the mL, and taking the mixture as the slurry for the subsequent photo-curing printing when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of a dispersing machine;
step 2, modeling a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology (CST studio unit 2014), taking a perfect conductor PEC as a substrate, and firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 8mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 3mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; and then, a plurality of honeycomb units are periodically arranged and connected according to the imitated honeycomb structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained. The reflectivity simulation results show that when a=8 and b=3, the honeycomb metamaterial has a very wide effective electromagnetic wave response frequency band, and the electromagnetic wave absorptivity reaches 61.9%.
And 3, performing physical printing preparation on the printed metamaterial structure by adopting a photo-curing printing technology SLA.
And 4, calcining the obtained real object in a nitrogen atmosphere, heating to 350 ℃ at a speed of 1 ℃/min, and calcining at a temperature of 350 ℃ for 3h to obtain the required honeycomb metamaterial.
Example 7
The invention relates to a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, comprising the following steps:
step 1, carbon nanotubes and photosensitive resin according to 3 g:200 Uniformly mixing the ratio of the mL, and taking the mixture as the slurry for the subsequent photo-curing printing when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of a dispersing machine;
step 2, modeling a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology (CST studio unit 2014), taking a perfect conductor PEC as a substrate, and firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 2mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 11mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; and then, a plurality of honeycomb units are periodically arranged and connected according to the imitated honeycomb structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained.
And 3, performing physical printing preparation on the printed metamaterial structure by adopting a photo-curing printing technology SLA.
And 4, calcining the obtained real object in a nitrogen atmosphere, heating to 330 ℃ at a speed of 2 ℃/min, and calcining at a temperature of 350 ℃ for 3h to obtain the required honeycomb metamaterial.
Example 8
The invention relates to a carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial and a preparation method thereof, comprising the following steps:
step 1, carbon nanotubes and photosensitive resin according to 4 g:200 Uniformly mixing the ratio of the mL, and taking the mixture as the slurry for the subsequent photo-curing printing when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of a dispersing machine;
step 2, modeling a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology (CST studio unit 2014), taking a perfect conductor PEC as a substrate, and firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 5mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 2mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; and then, a plurality of honeycomb units are periodically arranged and connected according to the imitated honeycomb structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained.
And 3, performing physical printing preparation on the printed metamaterial structure by adopting a photo-curing printing technology SLA.
And 4, calcining the obtained real object in a nitrogen atmosphere, heating to 370 ℃ at a speed of 3 ℃/min, and calcining at a temperature of 350 ℃ for 3h to obtain the required honeycomb metamaterial.
Claims (3)
1. The preparation method of the carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial is characterized by comprising the following steps of:
step 1, according to the dosage ratio of the carbon nano tube to the photosensitive resin of 1-5g: uniformly dispersing the carbon nano tube in 200mL of photosensitive resin through a dispersing machine, and obtaining the photo-curing printing slurry when the shearing force of the slurry reaches 450-470 eta/mPa.S under the action of the dispersing machine;
step 2, simulating a honeycomb metamaterial structure by using a three-dimensional full-wave electromagnetic field simulation technology, wherein the specific simulation steps are as follows: adopting CST studio unit 2014 simulation software, taking a perfect conductor PEC as a substrate, firstly establishing a base with a regular hexagon cross section on the substrate, wherein the side length of the base is 3.5mm, and the height a is 6mm; then three vertexes which are spaced from each other are selected as references on the upper surface of the base, two right triangles are respectively established by two sides connected with each vertex, the two right triangles share one side which is perpendicular to the upper surface of the base, the height b of each right triangle is 5mm, and then the wall thickness of the base and the thickness of each right triangle are set to be 2mm, so that a honeycomb unit is formed; a plurality of honeycomb units are periodically arranged and connected according to a honeycomb-like structure to form a honeycomb structure, and the honeycomb structure is modeled perpendicular to the Z-axis direction, so that the required honeycomb metamaterial structure is obtained;
step 3, taking the honeycomb metamaterial structure obtained by simulation in the step 2 as a pre-printing model, and performing physical printing preparation on the slurry obtained in the step 1 by adopting a photo-curing printing technology SLA;
and step 4, calcining the printed matter in a nitrogen atmosphere to obtain the carbon nano tube-based broadband electromagnetic wave absorption honeycomb metamaterial.
2. The method for preparing the carbon nanotube-based broadband electromagnetic wave absorption honeycomb metamaterial according to claim 1, wherein the method comprises the following steps: in the step 4, the temperature of the calcination treatment is 330-370 ℃, the heating rate is 1-3 ℃/min, and the calcination time is 3h.
3. A carbon nanotube-based broadband electromagnetic wave absorbing honeycomb metamaterial prepared by the method of claim 1 or 2.
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| CN115122734B (en) * | 2022-06-27 | 2023-11-03 | 盱眙欧佰特粘土材料有限公司 | Wave-absorbing composite material with double-layer inclined honeycomb sandwich structure and preparation method thereof |
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