A nested hollow multi-prism honeycomb wave-absorbing structure
By using a nested hollow pyramidal honeycomb absorbing structure, and by employing impedance gradients and multiple reflections, the problems of complex manufacturing processes and poor controllability in existing technologies are solved, achieving a broadband and strong absorption effect at a thin thickness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- MERCER MATERIALS (SUZHOU) CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-06-02
AI Technical Summary
Existing cellular absorbing structures have complex fabrication processes, poor controllability, and difficulty in achieving broadband and strong absorption at thin thicknesses, and their performance is not stable enough.
A honeycomb absorbing structure with nested hollow multi-faceted pyramids is adopted. The hollow multi-faceted pyramids are nested in the honeycomb structure and filled with a wave-absorbing foam filling layer inside. The surface is coated with a wave-absorbing coating and a reflective layer is set at the bottom to form an impedance gradient structure to enhance electromagnetic wave absorption.
It achieves broadband and strong absorption of electromagnetic waves with a relatively thin thickness and has structural stability, thus improving the absorption performance.
Smart Images
Figure CN224318711U_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of microwave absorbing composite material technology, and particularly relates to a honeycomb microwave absorbing structure with nested hollow multi-faceted pyramids. Background Technology
[0002] Honeycomb absorbing structures integrate load-bearing and absorbing functions while being lightweight, making them one of the most commonly used absorbing structures in the field of stealth technology. Currently, the main method for fabricating honeycomb absorbing structures involves uniformly introducing an electromagnetic wave absorber onto the transparent honeycomb walls through impregnation. However, this method produces honeycomb absorbing structures with limited electromagnetic properties and lacks impedance matching design, making it difficult to achieve broadband absorption. Furthermore, to achieve effective absorption, traditional honeycomb absorbing structures often require significant thickness, which contradicts the design principles of absorbing materials that prioritize thinness, lightness, bandwidth, and strength.
[0003] To further improve the microwave absorption performance of the honeycomb structure, a gradient impregnation method was adopted in this study. This method distributes the absorbent in a gradient along the pore direction of the honeycomb, creating a structure with gradually changing impedance to achieve good microwave absorption performance. However, in practical applications, it was found that the gradient impregnation process is complex and lacks controllability due to the involvement of multiple absorbing pastes and the need for multiple partitioned impregnations of the honeycomb structure. This results in unstable performance of the finished product, failing to meet the requirement of achieving broadband and strong electromagnetic wave absorption at relatively thin thicknesses. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the prior art by providing a honeycomb absorbing structure with nested hollow pyramids, which has strong controllability, stable product, and can achieve broadband strong absorption of electromagnetic waves with a relatively thin thickness.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a honeycomb absorbing structure with nested hollow polygonal pyramids, comprising a honeycomb structure, hollow polygonal pyramids, a absorbing foam filling layer, and a absorbing coating; the honeycomb structure is composed of multiple identical cell cells arranged according to a preset rule, each cell cell forming a hole by constructing a polygon from multiple honeycomb walls; the hollow polygonal pyramids are disposed within the holes; the number of sides of the hollow polygonal pyramids is the same as the number of honeycomb walls, and the bottom of each side is connected to each honeycomb wall in a one-to-one correspondence; the absorbing foam filling layer fills the hollow interior of the hollow polygonal pyramids; the absorbing coating is applied to the inner side of the honeycomb walls and the surface of the hollow polygonal pyramids.
[0006] Furthermore, the hollow multi-faceted pyramid and the honeycomb structure are made of the same material, namely aramid transparent material.
[0007] Furthermore, a reflective layer is also attached to the bottom of the honeycomb structure.
[0008] Furthermore, the reflective layer is a thin metal film.
[0009] Furthermore, the microwave-absorbing foam filling layer is a foamed resin.
[0010] Furthermore, the bottom edge of the hollow multi-faceted pyramid is tightly connected to the bottom edge of the honeycomb wall to form an integral structure.
[0011] Furthermore, the size of the hollow pyramid is no larger than that of the honeycomb wall.
[0012] Furthermore, when the number of honeycomb walls is four, the hollow polygonal pyramid is a square pyramid; when the number of honeycomb walls is six, the hollow polygonal pyramid is a hexagonal pyramid.
[0013] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:
[0014] This invention relates to a honeycomb absorbing structure with nested hollow polygonal pyramids. Hollow polygonal pyramids are nested within a honeycomb structure, and an absorbing foam filling layer is placed inside the hollow polygonal pyramids. This utilizes the continuous change in the height of the hollow polygonal pyramids to create a gradual impedance change, allowing electromagnetic waves to penetrate the structure more effectively. Simultaneously, an absorbing coating is applied to the surface of the hollow polygonal pyramids and the inner side of the honeycomb walls. This not only enhances the absorption and loss of electromagnetic waves but also facilitates multiple reflections of electromagnetic waves between the honeycomb walls and the hollow polygonal pyramids, further improving absorption. Therefore, this honeycomb absorbing structure achieves broadband and strong absorption of electromagnetic waves with a relatively thin thickness and exhibits structural stability.
[0015] Secondly, the reflective layer at the bottom of the honeycomb structure further reflects electromagnetic waves, causing them to be absorbed again, thereby improving the absorption performance of this wave-absorbing structure. Attached Figure Description
[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings:
[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0018] Figure 2 This is a schematic diagram of a single hollow multi-faceted pyramid arranged in a cell according to an embodiment of the present invention;
[0019] Figure 3 for Figure 1 A partial cross-sectional view;
[0020] Figure 4 for Figure 3 A partial schematic diagram;
[0021] The components include: 1. honeycomb structure; 2. hollow multi-faceted pyramid; 3. microwave absorbing foam filling layer; 4. microwave absorbing coating; 5. reflective layer; 10. honeycomb wall; 11. pores. Detailed Implementation
[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0023] This invention provides a honeycomb absorbing structure with nested hollow pyramids to solve the problem that the existing honeycomb structure uses multiple partitioned impregnation to obtain excellent absorbing performance. This method is complex and has poor controllability, resulting in unstable performance of the finished product.
[0024] For ease of understanding, the specific processes in the embodiments of this application are described below. Please refer to [link / reference]. Figures 1 to 4 This application provides an embodiment of a nested hollow polygonal pyramid honeycomb absorbing structure, comprising a honeycomb structure 1, a hollow polygonal pyramid 2, an absorbing foam filling layer 3, and an absorbing coating 4. The honeycomb structure 1 is composed of multiple identical cell cells arranged according to a preset rule. Each cell cell is formed by constructing a polygon from multiple honeycomb walls 10 to create a hole 11. The hollow polygonal pyramid 2 is disposed within the hole 11. The number of sides of the hollow polygonal pyramid 2 is the same as the number of honeycomb walls 10, and the bottom of each side is connected to each honeycomb wall 10 in a one-to-one correspondence. The absorbing foam filling layer 3 fills the hollow interior of the hollow polygonal pyramid 2. The absorbing coating 4 is applied to the inner side of the honeycomb walls 10 and the surface of the hollow polygonal pyramid 2.
[0025] This invention relates to a honeycomb absorbing structure with nested hollow polygonal pyramids. Hollow polygonal pyramids 2 are nested within a honeycomb structure 1, and an absorbing foam filling layer 3 is placed inside the hollow polygonal pyramids 2. This utilizes the characteristic of the continuous change in the height of the hollow polygonal pyramids 2 to create a gradual change in impedance, allowing electromagnetic waves to better penetrate the structure. Simultaneously, an absorbing coating 4 is provided on the surface of the hollow polygonal pyramids and the inner side of the honeycomb walls. This enhances the absorption and loss of electromagnetic waves and also facilitates multiple reflections of electromagnetic waves between the honeycomb walls 10 and the hollow polygonal pyramids 2, further improving the absorption of electromagnetic waves. Therefore, this honeycomb absorbing structure can achieve broadband and strong absorption of electromagnetic waves with a relatively thin thickness and possesses structural stability.
[0026] The microwave absorbing coating 4 is formed by spraying or impregnating with a microwave absorbing slurry, which is a mixture of an absorbent and a resin. The absorbent includes, but is not limited to, a combination of conductive carbon black, graphene, carbon nanotubes, porous carbon, and carbon nanofibers. The resin is an environmentally friendly water-based resin, specifically one of water-based epoxy, water-based acrylic, or water-based polyurethane resins.
[0027] Furthermore, a reflective layer 5 is also attached to the bottom of the honeycomb structure 1. The reflective layer 5 is a metal film, specifically one of aluminum foil or copper foil. The reflective layer 5 can further reflect electromagnetic waves so that the electromagnetic waves can be absorbed again by the honeycomb absorbing structure, thereby improving the absorption performance of the honeycomb absorbing structure.
[0028] Furthermore, in this embodiment, the microwave absorbing foam filling layer 3 is a foaming resin with mixed absorbent, which is foamed in the hollow polygonal pyramid 2 and then cut and shaped. The foaming resin is specifically polyurethane resin, which can foam on its own at room temperature and pressure. The process is simple and the structure is stable.
[0029] Furthermore, the honeycomb structure 1 is made of aramid wave-transparent material, which has excellent wave-transparent properties and structural uniformity.
[0030] Furthermore, the bottom edges of the hollow polygonal pyramid 2 are tightly connected to the bottom edges of the honeycomb wall 10 to form an integral structure. This structure has good mechanical properties and can also protect the microwave absorbing foam filling layer 3, preventing it from breaking or shattering under impact. In addition, the hollow polygonal pyramid 2 is made of the same material as the honeycomb structure 1, which is aramid microwave-transparent material.
[0031] Furthermore, the size of the hollow polygonal pyramid 2 is not higher than that of the honeycomb wall 10.
[0032] Secondly, the number of honeycomb walls 10 can be four or six. When there are four honeycomb walls 10, the hollow polygonal pyramid 2 corresponds to a square pyramid; when there are six honeycomb walls 10, the hollow polygonal pyramid 2 corresponds to a hexagonal pyramid. Whether the hollow polygonal pyramid 2 is a square pyramid or a hexagonal pyramid, the sides of the hollow polygonal pyramid 2 are connected one-to-one with the corresponding honeycomb walls 10, thus forming an integrated structure with stable and controllable overall structure. Of course, the number of sides of the hollow polygonal pyramid can be adjusted according to the actual wave absorption performance.
[0033] The following examples illustrate how this honeycomb absorbing structure is prepared. In the examples listed, there are six honeycomb walls and six pyramidal sides. In this case, the hollow multi-faceted pyramid is a hollow hexagonal pyramid.
[0034] Example 1:
[0035] (1) An aramid honeycomb integrated structure with hollow hexagonal pyramids nested in the holes was prepared by compression molding. The hollow hexagonal pyramids and the honeycomb wall are made of the same material and the structure is an integrated structure. The height of the honeycomb wall and the height of the hollow hexagonal pyramids are both 5 mm.
[0036] (2) Conductive carbon black, graphene, and carbon nanotubes are pre-dispersed in PVP aqueous solution at a mass ratio of 1:3:10, and then added to waterborne epoxy resin. The mixture is dispersed using a homogenizer to prepare a microwave absorbing slurry, with water added during the process to adjust its viscosity. The honeycomb structure with hollow hexagonal pyramids nested in the pores obtained in step (1) is placed upside down and immersed in the microwave absorbing slurry to make the microwave absorbing slurry evenly adhere to the inner side of the honeycomb wall and the surface of the hollow hexagonal pyramids, and then dried and cured.
[0037] (3) Add 10 wt% carbon nanofibers to polyurethane foaming compound A. After mixing evenly, add compound B and stir. Before the mixture foams, fill it into the hollow hexagonal pyramid impregnated in step (2) for foaming, so that it fills the interior of the hollow hexagonal pyramid and protrudes. After curing, cut and shape it so that the bottom surface is flat.
[0038] (4) Use adhesive to attach aluminum foil to the bottom of the structure obtained in step (3) as a reflective layer to obtain a honeycomb absorbing structure with nested hollow hexagonal pyramids.
[0039] Example 2:
[0040] (1) An aramid honeycomb integrated structure with hollow hexagonal pyramids nested in the holes was prepared by compression molding. The height of the honeycomb wall was 10 mm and the height of the hollow hexagonal pyramids was 8 mm.
[0041] (2) Porous carbon, graphene, and carbon nanofibers were pre-dispersed in a PVP aqueous solution at a mass ratio of 1:3:1, and then added to an aqueous polyurethane resin. The mixture was dispersed using a homogenizer to prepare a microwave absorbing slurry, with water added during the process to adjust its viscosity. The honeycomb structure with hollow hexagonal pyramids nested in the pores obtained in step (1) was then placed upside down and immersed in the microwave absorbing slurry to ensure that the microwave absorbing slurry was uniformly attached to the inner side of the honeycomb wall and the surface of the hollow hexagonal pyramids. The mixture was then dried and cured.
[0042] (3) Add 5 wt% conductive carbon black to polyurethane foaming compound A. After mixing evenly, add compound B and stir. Before foaming the mixture, fill it into the hollow hexagonal pyramid impregnated in step (2) for foaming, so that it fills the interior of the hollow hexagonal pyramid and protrudes. After curing, cut and shape it so that the bottom surface is flat.
[0043] (4) Use adhesive to attach copper foil to the bottom of the structure obtained in step (3) as a reflective layer to obtain a honeycomb absorbing structure with nested hollow hexagonal pyramids.
[0044] The honeycomb absorbing structure can be prepared quickly and effectively using the above method. The prepared honeycomb absorbing structure can achieve broadband and strong absorption of electromagnetic waves with a relatively thin thickness, which meets the production needs of enterprises.
[0045] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A honeycomb absorbing structure with nested hollow polygonal pyramids, characterized in that: The device includes a honeycomb structure (1), a hollow multi-faceted pyramid (2), a microwave-absorbing foam filling layer (3), and a microwave-absorbing coating layer (4). The honeycomb structure (1) is composed of multiple cells of the same shape arranged according to a preset rule. Each cell is formed by constructing a polygon from multiple honeycomb walls (10) to form a hole (11). The hollow multi-faceted pyramid (2) is placed inside the hole (11). The number of sides of the hollow multi-faceted pyramid (2) is the same as the number of honeycomb walls (10), and the bottom of each side is connected to each honeycomb wall (10) in a one-to-one correspondence. The microwave-absorbing foam filling layer (3) fills the hollow interior of the hollow multi-faceted pyramid (2). The microwave-absorbing coating layer (4) is coated on the inner side of the honeycomb walls (10) and the surface of the hollow multi-faceted pyramid (2).
2. The nested hollow polygonal pyramidal honeycomb absorbing structure as described in claim 1, characterized in that: The hollow multi-faceted pyramid (2) and the honeycomb structure (1) are made of the same material, namely aramid transparent material.
3. The nested hollow polygonal pyramidal honeycomb absorbing structure as described in claim 1, characterized in that: A reflective layer (5) is also attached to the bottom of the honeycomb structure (1).
4. The nested hollow polygonal pyramidal honeycomb absorbing structure as described in claim 3, characterized in that: The reflective layer (5) is a thin metal film.
5. The nested hollow polygonal pyramidal honeycomb absorbing structure as described in claim 1, characterized in that: The microwave absorbing foam filling layer (3) is a foaming resin.
6. The honeycomb absorbing structure with nested hollow polygonal pyramids as described in claim 1, characterized in that: The bottom edge of the hollow multi-faceted pyramid (2) is closely connected to the bottom edge of the honeycomb wall (10) to form an integral structure.
7. The nested hollow polygonal pyramidal honeycomb absorbing structure as described in claim 1, characterized in that: The size of the hollow polygonal pyramid (2) is not higher than that of the honeycomb wall (10).
8. The honeycomb absorbing structure with nested hollow polygonal pyramids as described in claim 1, characterized in that: When the number of honeycomb walls (10) is four, the hollow polygonal pyramid (2) is a square pyramid; when the number of honeycomb walls (10) is six, the hollow polygonal pyramid (2) is a hexagonal pyramid.