A laser-resistant stealth integrated structure, its fabrication method and application

Abstract

This invention discloses an integrated laser-resistant and stealth structure, its fabrication method, and its application, belonging to the field of laser protection and stealth technology. It includes: an alumina layer, serving as mechanical support and providing laser resistance; a silica aerogel felt layer with a conductive oil film resistive coating to isolate or slow heat transfer and absorb and reflect electromagnetic waves; and a silica sheet to reflect and initially absorb laser energy, providing laser ablation protection. The alumina layer includes a bottom edge and a hexagonal honeycomb structure disposed on the bottom edge. The silica aerogel felt is embedded in the honeycomb cells of the hexagonal honeycomb structure of the alumina layer, with its top edge flush with the edge of the hexagonal honeycomb of the alumina layer. This structure, through the design of a multi-layer composite material, combines excellent laser protection and stealth performance, effectively protecting the internal structure from damage under high-energy laser irradiation and providing excellent thermal insulation, laser resistance, and pressure resistance.

Description

Technical Field

[0001] This invention relates to the field of laser protection and stealth technology, and in particular to an integrated laser-resistant and stealth structure, its preparation method, and its application. Background Technology

[0002] With the rapid development of high-energy laser weapons, their application on the modern battlefield is becoming increasingly widespread. Compared with traditional weapons, high-energy lasers have advantages such as fast reaction speed, high precision, and difficulty in detection, enabling them to accurately strike targets from thousands of meters away. However, existing laser protection technologies, such as reflective coatings, absorbing materials, and heat-insulating layers, are often limited by wavelength and incident angle, and cannot provide comprehensive and effective protection, especially under intense laser irradiation, where they are prone to overheating and damage.

[0003] Meanwhile, the application of stealth technology in modern military equipment has become crucial. Electromagnetic stealth materials improve equipment survivability by reducing the likelihood of detection. However, traditional stealth materials cannot simultaneously provide laser protection and stealth performance when facing high-energy laser weapons, resulting in unsatisfactory protective effects, especially as they are prone to failure under laser irradiation.

[0004] Therefore, there is an urgent need for a new type of composite material that integrates laser protection and electromagnetic stealth functions, which can effectively reflect and absorb laser energy, reduce electromagnetic wave reflection, have high thermal isolation capabilities, adapt to high temperature and high pressure environments, meet the needs of multiple protections on the battlefield, and provide long-lasting protection. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated laser-resistant and stealth structure, its preparation method, and its application. This structure, through the design of multilayer composite materials, combines excellent laser protection and stealth performance. It can effectively protect the internal structure from damage under high-energy laser irradiation and provides excellent thermal insulation, laser resistance, and pressure resistance.

[0006] To achieve the above objectives, the present invention provides a laser-resistant and stealth integrated structure, comprising the following structures arranged sequentially from bottom to top:

[0007] The bottom layer is an aluminum oxide layer, which serves as mechanical support and provides laser resistance.

[0008] The filling layer is a silica aerogel felt layer with a conductive oil film resistive coating to isolate or slow down heat transfer and absorb and reflect electromagnetic waves.

[0009] The outer layer is a silicon dioxide board, which reflects and initially absorbs laser energy, providing protection against laser ablation.

[0010] The alumina layer includes a bottom edge and a hexagonal honeycomb structure disposed on the bottom edge. The hexagonal honeycomb structure and the bottom edge are an integral structure. The silica aerogel felt is embedded in the honeycomb holes of the hexagonal honeycomb structure of the alumina layer, and the top end is flush with the edge of the hexagonal honeycomb of the alumina layer.

[0011] Preferably, the silica aerogel felt layer comprises several silica aerogel felts of the same shape, and the silica aerogel felt is composed of three layers of silica aerogel felt sheets of the same thickness.

[0012] Preferably, the silica aerogel felt is a regular hexagon, and the side length of the regular hexagon is equal to the inner side length of the regular hexagon of the hexagonal honeycomb structure.

[0013] Preferably, the top of each silica aerogel felt is printed with a conductive oil film resistive coating with a sheet resistance value. The pattern of the conductive oil film resistive coating is two concentric hexagonal rings with gaps. The sheet resistance of the conductive oil film resistive coating of the first silica aerogel felt is 50Ω / sq, the sheet resistance of the conductive oil film resistive coating of the second silica aerogel felt is 100Ω / sq, the sheet resistance of the conductive oil film resistive coating of the third silica aerogel felt is 400Ω / sq, and the bottom of the third silica aerogel felt is uniformly covered with a conductive oil film resistive coating with a sheet resistance of 100Ω / sq.

[0014] Preferably, the bottom edge thickness of the alumina layer is 1.2 mm, the thickness of the hexagonal honeycomb structure is 6.0 mm, the thickness of the silica aerogel felt layer is 6.0 mm, and the thickness of the silica plate is 1.2 mm.

[0015] The present invention also provides a method for preparing an anti-laser stealth integrated structure, wherein the alumina layer, the silica aerogel felt layer and the silica plate are all prepared to the required size by laser cutting and then bonded and assembled.

[0016] Preferably, the alumina layer is prepared by: using 3D printing technology to prepare a hexagonal honeycomb structure of alumina and then sintering it at 1500°C in a resistance furnace for 3 hours.

[0017] Preferably, the preparation of the silica aerogel felt layer includes the following steps:

[0018] (1) Conductive oil film resistive coatings with different sheet resistance values ​​are printed on the surface of the silica aerogel felt according to the assembly sequence using screen printing process, and conductive oil film resistive coatings are printed on the bottom of the silica aerogel felt placed in the third layer.

[0019] (2) After printing, the silica aerogel felt is placed in an oven at 120°C for 20 minutes to dry; and the sheet resistance of the prepared resistive coating is measured using a four-probe sheet resistance tester to ensure that the sheet resistance error does not exceed 10%.

[0020] (3) Use silicone adhesive to bond the three layers of silica aerogel sheets.

[0021] The laser-resistant and stealth integrated structure provided by this invention can be applied to the stealth and protection of aerospace and military equipment to resist high-energy laser attacks.

[0022] Therefore, the present invention, employing the aforementioned laser-resistant stealth integrated structure, its fabrication method, and its application, possesses the following beneficial effects:

[0023] (1) The present invention uses an alumina honeycomb structure as the bottom layer to provide mechanical support and laser resistance to the material, and has high temperature stability. The silica board can reflect and absorb the initial energy of the laser, while providing high temperature resistance physical protection. The silica board is bonded to the bottom layer material with silicone adhesive to enhance the stability of the overall structure.

[0024] (2) This invention uses silica aerogel felt as a filling layer, which provides effective thermal insulation and absorbs and reflects laser energy. Each silica aerogel felt layer has a resistive coating of a specific shape and sheet resistance value printed on its top. This resistive coating helps optimize the absorption and reflection performance of electromagnetic waves in the 2-18 GHz frequency band. This structure has an electromagnetic reflectivity of less than -10 dB in the 2.5-15.5 GHz frequency band from room temperature to 500℃, adapting to high-temperature environments and preventing damage to equipment from laser attacks.

[0025] (3) The anti-laser stealth integrated structure of the present invention can effectively solve the problem that existing laser protection materials cannot provide continuous protection under high-energy laser irradiation. At the same time, it has excellent thermal isolation, pressure resistance, stealth and anti-laser capabilities. It is suitable for stealth and protection needs in high-temperature environments and is widely used in the stealth and protection fields of aerospace and military equipment. It integrates electromagnetic stealth, laser protection, thermal isolation and pressure resistance capabilities to provide all-round protection for equipment and greatly improve the survivability and reliability of equipment under high-energy laser attacks.

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a single-package structure of an anti-laser stealth integrated structure according to the present invention;

[0028] Figure 2These are three views of an alumina layer single-clad structure of an anti-laser-stealth integrated structure according to the present invention: (a) is a front view, (b) is a side view, and (c) is a top view.

[0029] Figure 3 This is a schematic diagram of a conductive oil film resistive coating of an anti-laser-stealth integrated structure in an embodiment of the present invention;

[0030] Figure 4 The reflectance of the material prepared according to the present invention is measured in the range of 2-18 GHz at room temperature to 500°C.

[0031] Figure label:

[0032] 1. Silica sheet; 2. Silica aerogel felt layer; 21. First layer of silica aerogel felt; 22. Second layer of silica aerogel felt; 23. Third layer of silica aerogel felt; 24. Conductive oil film resistive coating; 3. Alumina layer; 31. Bottom edge; 32. Hexagonal honeycomb structure. Detailed Implementation

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following description will be provided in conjunction with the accompanying drawings of the embodiments of the present invention. Figures 1 to 3 The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "center", "around", "lateral", "longitudinal", "length", "thickness", "angle", "up", "down", "left", "right", etc., which indicate the orientation or location, are limited to simplifying the description of this invention and are not specific locations or orientations. The above terms are not intended to limit this invention.

[0037] The specific connection methods of each part in this invention all adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0038] Example

[0039] like Figure 1 As shown, this embodiment provides a laser-resistant and stealth integrated structure, including the following structures arranged sequentially from bottom to top:

[0040] The bottom layer is aluminum oxide layer 3, which serves as mechanical support and provides laser resistance;

[0041] The filling layer is a silica aerogel felt layer 2, which is provided with a conductive oil film resistive coating 24 to isolate or slow down the transfer of heat and absorb and reflect electromagnetic waves.

[0042] The outer layer is a silicon dioxide substrate 1, which is used to reflect and initially absorb laser energy, and provides physical protection against high temperature and wear.

[0043] The alumina layer 3 includes a bottom edge 31 and a hexagonal honeycomb structure 32 disposed on the bottom edge 31. The hexagonal honeycomb structure 32 and the bottom edge 31 are an integral structure. The silica aerogel felt layer 2 is embedded in the honeycomb holes of the hexagonal honeycomb structure 32 of the alumina layer 3, and its top is flush with the edge of the hexagonal honeycomb of the alumina layer 3. The silica aerogel felt layer 2 is a regular hexagon, and the side length of the regular hexagon is equal to the inner side length of the regular hexagon of the hexagonal honeycomb structure 32.

[0044] like Figure 2 The three views of the alumina layer 3 are shown in (a) front view, (b) side view, and (c) top view. The thickness of the bottom edge 31 is 1.2 mm, the thickness of the hexagonal honeycomb structure 32 is 1.0 mm, the inner side length of the hexagonal honeycomb structure 32 is 6.0 mm, and the width is 6.0 mm.

[0045] The silica aerogel felt layer 2 comprises several silica aerogel felts of the same shape, each composed of three layers of silica aerogel felt 2 of the same thickness. Each silica aerogel felt sheet has a conductive oil film resistive coating 24 with a sheet resistance value printed on its top surface. In this embodiment, the conductive oil film resistive coating 24 is... Figure 3 The pattern shown is two concentric hexagonal rings with gaps. The sheet resistance of the conductive oil film resistive coating 24 of the first layer of silica aerogel felt 21 is 50Ω / sq, the sheet resistance of the conductive oil film resistive coating 24 of the second layer of silica aerogel felt 22 is 100Ω / sq, and the sheet resistance of the conductive oil film resistive coating 24 of the third layer of silica aerogel felt 23 is 400Ω / sq. The bottom of the third layer of silica aerogel felt 23 is uniformly covered with conductive oil film resistive coating 24, and the sheet resistance of the bottom conductive oil film resistive coating 24 is 100Ω / sq.

[0046] The bottom edge 31 of the alumina layer 3 has a thickness of 1.2 mm, the hexagonal honeycomb structure 32 has a thickness of 6.0 mm, the silica aerogel felt layer 2 has a thickness of 6.0 mm, and the silica plate 1 has a thickness of 1.2 mm. The total thickness of the overall structure is 8.4 mm.

[0047] The laser-resistant and stealth integrated structure is made of aluminum oxide layer 3, silica aerogel felt layer 2 and silica plate 1, all of which are prepared to the required size by laser cutting and then bonded together.

[0048] The alumina layer 3 was prepared by using 3D printing technology to prepare a hexagonal honeycomb structure of alumina and then sintering it at 1500℃ in a resistance furnace for 3 hours.

[0049] The preparation of silica aerogel felt layer 2 includes the following steps:

[0050] (1) Conductive oil film resistive coating 24 with different sheet resistance values ​​is printed on the surface of the silica aerogel felt according to the assembly sequence, and conductive oil film resistive coating 24 is printed on the bottom of the silica aerogel felt placed in the third layer.

[0051] (2) After printing, the silica aerogel felt is placed in an oven at 120°C for 20 minutes to dry; and the sheet resistance of the prepared resistive coating is measured using a four-probe sheet resistance tester to ensure that the sheet resistance error does not exceed 10%.

[0052] (3) Use silicone adhesive to bond the three layers of silica aerogel sheets.

[0053] Application examples

[0054] like Figure 4 As shown, the reflectivity of the material prepared by the present invention measured in the 2.5-15.5GHz frequency band from room temperature to 500℃ is all below -10dB, which means that the material prepared by the present invention can achieve a wave absorption rate of more than 90% in this temperature and frequency band range.

[0055] Therefore, this invention provides an integrated laser-resistant and stealth structure, its fabrication method, and its application. Within a high-temperature range from room temperature to 500°C, it can effectively absorb electromagnetic waves in the 2.5-15.5 GHz frequency band, achieving an absorption rate of over 90%. It also possesses excellent thermal isolation, high-temperature resistance, and resistance to high-energy laser ablation. This structure can be widely applied in situations requiring defense against high-energy laser attacks, providing comprehensive protection.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A laser-resistant and stealth integrated structure, characterized in that, This includes the following structures arranged from bottom to top: The bottom layer is an aluminum oxide layer, which serves as mechanical support and provides laser resistance. The filling layer is a silica aerogel felt layer with a conductive oil film resistive coating to isolate or slow down heat transfer and absorb and reflect electromagnetic waves. The outer layer is a silicon dioxide board, which reflects and initially absorbs laser energy, providing protection against laser ablation. The alumina layer includes a bottom edge and a hexagonal honeycomb structure disposed on the bottom edge. The hexagonal honeycomb structure and the bottom edge are an integral structure. The silica aerogel felt layer is embedded in the honeycomb holes of the hexagonal honeycomb structure of the alumina layer, and the top edge is flush with the edge of the hexagonal honeycomb of the alumina layer. The silica aerogel felt layer includes several silica aerogel felts of the same shape, and the silica aerogel felt is composed of three layers of silica aerogel felt sheets of the same thickness. The top of each silica aerogel felt is printed with a conductive oil film resistive coating with a sheet resistance value. The pattern of the conductive oil film resistive coating is two concentric hexagonal rings with gaps. The sheet resistance of the conductive oil film resistive coating of the first silica aerogel felt is 50Ω / sq, the sheet resistance of the conductive oil film resistive coating of the second silica aerogel felt is 100Ω / sq, the sheet resistance of the conductive oil film resistive coating of the third silica aerogel felt is 400Ω / sq, and the bottom of the third silica aerogel felt is uniformly covered with a conductive oil film resistive coating with a sheet resistance of 100Ω / sq.

2. The laser-resistant stealth integrated structure according to claim 1, characterized in that, The silica aerogel felt is a regular hexagon, and the side length of the regular hexagon is equal to the inner side length of the regular hexagon of the hexagonal honeycomb structure.

3. The laser-resistant stealth integrated structure according to claim 1, characterized in that, The bottom edge thickness of the alumina layer is 1.2 mm, the thickness of the hexagonal honeycomb structure is 6.0 mm, the thickness of the silica aerogel felt layer is 6.0 mm, and the thickness of the silica plate is 1.2 mm.

4. A method for fabricating a laser-resistant stealth integrated structure as described in any one of claims 1-3, characterized in that, The alumina layer, silica aerogel felt layer, and silica board are all prepared to the required size by laser cutting and then bonded and assembled.

5. The method for fabricating a laser-resistant stealth integrated structure according to claim 4, characterized in that, The alumina layer is prepared by using 3D printing technology to prepare a hexagonal honeycomb structure of alumina and then sintering it at 1500°C in a resistance furnace for 3 hours.

6. The method for fabricating a laser-resistant stealth integrated structure according to claim 4, characterized in that, The preparation of the silica aerogel felt layer includes the following steps: (1) Conductive oil film resistive coatings with different sheet resistance values ​​are printed on the surface of the silica aerogel felt according to the assembly sequence using screen printing process, and conductive oil film resistive coatings are printed on the bottom of the silica aerogel felt placed in the third layer. (2) After printing, the silica aerogel felt is placed in an oven at 120°C for 20 minutes to dry; and the sheet resistance of the prepared resistive coating is measured using a four-probe sheet resistance tester to ensure that the sheet resistance error does not exceed 10%; (3) Use silicone adhesive to bond the three-layer silica aerogel felt.

7. An application of the laser-resistant stealth integrated structure as described in any one of claims 1-3, characterized in that, The laser-resistant and stealth integrated structure is used in the stealth and protection of aerospace and military equipment to resist high-energy laser attacks.

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