Anti-laser-stealth integrated structure and preparation method and application thereof

Abstract

The invention discloses an anti-laser-stealth integrated structure and a preparation method and application thereof, and belongs to the technical field of laser protection and stealth. Comprising an aluminum oxide layer which is used as a mechanical support and provides anti-laser capability; the silicon dioxide aerogel felt layer is provided with a conductive oil film resistance coating, so that heat transfer is isolated or slowed down, and electromagnetic waves are absorbed and reflected; the silicon dioxide plate reflects and preliminarily absorbs laser energy, and laser ablation resistance protection is achieved; the aluminum oxide layer comprises a bottom edge and a hexagonal honeycomb structure arranged on the bottom edge, the silicon dioxide aerogel felt is embedded into honeycomb holes of the hexagonal honeycomb structure of the aluminum oxide layer, and the top end of the silicon dioxide aerogel felt is flush with the edge of the hexagonal honeycomb of the aluminum oxide layer. Through the design of a multi-layer composite material, the structure has excellent laser protection performance and stealth performance, the internal structure can be effectively protected against damage under high-energy laser irradiation, and excellent thermal isolation, laser resistance and pressure resistance are provided.

Description

Technical Field

[0001] The present invention relates to the field of laser protection and stealth technology, and in particular to an anti-laser-stealth integrated structure and a preparation method and application thereof. Background Art

[0002] With the rapid development of high-energy laser weapons, their application in modern battlefields is becoming more and more extensive. Compared with traditional weapons, high-energy lasers have advantages such as fast response speed, high precision and difficulty to be detected, and can accurately strike targets from thousands of meters away. However, existing laser protection technologies, such as reflective coatings, absorbing materials and thermal insulation layers, are often unable to provide comprehensive and effective protection due to limitations such as wavelength and incident angle, and are prone to overheating and damage, especially under strong laser irradiation.

[0003] At the same time, the application of stealth technology in modern military equipment has become crucial. Electromagnetic wave stealth materials improve the survivability of equipment by reducing the possibility of detection. However, when facing high-energy laser weapons, traditional stealth materials cannot take into account both laser protection and stealth performance, resulting in unsatisfactory protection effects, especially when they are easily ineffective under laser irradiation.

[0004] Therefore, there is an urgent need for a new composite material that integrates laser protection and electromagnetic stealth functions, which can not only effectively reflect and absorb laser energy, but also reduce the reflection of electromagnetic waves, have efficient thermal isolation capabilities, adapt to high temperature and high pressure environments, and meet the needs of multiple protections on the battlefield, providing lasting protection. Summary of the invention

[0005] The purpose of the present invention is to provide a laser-resistant and stealth integrated structure, a preparation method and an application thereof. The structure has excellent laser protection performance and stealth performance through the design of multi-layer composite materials, can effectively protect the internal structure from damage under high-energy laser irradiation, and provide excellent thermal isolation, laser resistance and pressure resistance.

[0006] To achieve the above object, the present invention provides an anti-laser-stealth integrated structure, comprising the following structures arranged in sequence from bottom to top:

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

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

[0009] The outer layer is a silicon dioxide sheet that reflects and initially absorbs laser energy and protects against laser ablation;

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

[0011] Preferably, the silica aerogel felt layer comprises a plurality of silica aerogel felts of the same shape, and the silica aerogel felt consists 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, a conductive oil film resistor coating with a square resistance is printed on the top of the silica aerogel felt sheet, the pattern of the conductive oil film resistor coating is two concentrically arranged hexagonal rings with gaps, the square resistance of the conductive oil film resistor coating of the first layer of silica aerogel felt sheet is 50Ω / sq, the square resistance of the conductive oil film resistor coating of the second layer of silica aerogel felt sheet is 100Ω / sq, the square resistance of the conductive oil film resistor coating of the third layer of silica aerogel felt sheet is 400Ω / sq, and the bottom of the third layer of silica aerogel felt sheet is evenly covered with the conductive oil film resistor coating, and the square resistance of the conductive oil film resistor coating at the bottom is 100Ω / sq.

[0014] Preferably, the bottom 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 aluminum oxide layer, the silicon dioxide aerogel felt layer and the silicon dioxide plate are all prepared into required sizes by laser cutting and then bonded and assembled.

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

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

[0018] (1) Printing conductive oil film resistor coatings with different square resistance values ​​on the surface of the silica aerogel felt sheet by screen printing according to the assembly order, and printing the conductive oil film resistor coating on the bottom of the silica aerogel felt sheet placed on the third layer;

[0019] (2) drying the printed silica aerogel felt sheet in an oven at 120° C. for 20 minutes; and measuring the square resistance of the prepared resistor coating using a four-probe square resistance tester to ensure that the square resistance error does not exceed 10%;

[0020] (3) Use silicon-based glue to bond the three-layer silica aerogel sheet.

[0021] The above-mentioned anti-laser-stealth integrated structure provided by the present invention is applied to the stealth and protection of aerospace and military equipment to resist high-energy laser attacks.

[0022] Therefore, the present invention adopts the above-mentioned anti-laser-stealth integrated structure and its preparation method and application, which have the following beneficial effects:

[0023] (1) The present invention uses an alumina honeycomb structure as the bottom layer, which provides mechanical support and laser resistance of the material and has high temperature stability, while the silica plate can reflect and absorb the initial energy of the laser and provide high temperature resistant physical protection. The silica plate is bonded to the bottom layer material by silicon-based glue to enhance the stability of the overall structure.

[0024] (2) The present invention uses silica aerogel felt as a filling layer, which plays an effective role in thermal isolation and absorbs and reflects laser energy. The top of each layer of silica aerogel felt is printed with a resistor coating of a specific shape and a specific square resistance value, which helps to optimize the electromagnetic wave absorption and reflection performance in the 2-18GHz frequency band. The structure has an electromagnetic reflectivity of less than -10dB in the range of room temperature to 500°C and 2.5-15.5GHz frequency band, adapts to high temperature environments, and prevents damage to equipment caused by 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 laser resistance capabilities, and is suitable for stealth and protection needs in high-temperature environments. It 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, provides all-round protection for equipment, and greatly improves the survivability and reliability of equipment under high-energy laser attacks.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 2The three views of an aluminum oxide layer single-package structure of an anti-laser-stealth integrated structure of the present invention, (a) is a front view, (b) is a side view, and (c) is a top view;

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

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

[0031] Reference numerals:

[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 resistor coating; 3. Alumina layer; 31. Bottom edge; 32. Hexagonal honeycomb structure. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0034] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, the following will be combined with the accompanying drawings in the embodiments of the present invention. Figures 1 to 3 The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "surroundings", "lateral", "longitudinal", "length", "thickness", "angle", "up", "down", "left", "right", etc., indicating directions or positions, are limited to simplifying the description of the present invention rather than specific positions or directions. The above terms are not limitations of the present invention.

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

[0038] Example

[0039] like Figure 1 As shown, this embodiment provides an anti-laser-stealth integrated structure, including the following structures arranged in sequence from bottom to top:

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

[0041] The filling layer is a silicon dioxide aerogel felt layer 2, provided with a conductive oil film resistor coating 24, which isolates or slows down the transfer of heat and absorbs and reflects electromagnetic waves;

[0042] The outer layer is a silicon dioxide plate 1, which is used to reflect and initially absorb laser energy and provide 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 integrated 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 the 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 As shown in the three views of the aluminum oxide layer 3, (a) is a front view, (b) is a side view, and (c) is a 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, and 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 includes a plurality of silica aerogel felts of the same shape, and the silica aerogel felt is composed of three layers of silica aerogel felt 2 sheets of the same thickness. A conductive oil film resistor coating 24 with a square resistance value is printed on the top of each silica aerogel felt sheet. In this embodiment, the conductive oil film resistor coating 24 is Figure 3 The pattern shown is two concentrically arranged hexagonal rings with gaps. The square resistance of the conductive oil film resistor coating 24 of the first layer of silica aerogel felt 21 is 50Ω / sq, the square resistance of the conductive oil film resistor coating 24 of the second layer of silica aerogel felt 22 is 100Ω / sq, and the square resistance of the conductive oil film resistor 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 evenly covered with the conductive oil film resistor coating 24, and the square resistance of the conductive oil film resistor coating 24 at the bottom 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-proof integrated structure is composed of an aluminum oxide layer 3, a silicon dioxide aerogel felt layer 2, and a silicon dioxide plate 1, which are prepared into required sizes by laser cutting and then bonded and assembled.

[0048] The aluminum oxide layer 3 is prepared by using 3D printing technology to prepare aluminum oxide into a hexagonal honeycomb structure, and then sintering it at a high temperature of 1500° C. in a resistance furnace for 3 hours.

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

[0050] (1) Printing conductive oil film resistor coatings 24 with different square resistance values ​​on the surface of the silica aerogel felt sheet by screen printing according to the assembly sequence, and printing the conductive oil film resistor coating 24 on the bottom of the silica aerogel felt sheet placed on the third layer;

[0051] (2) drying the printed silica aerogel felt sheet in an oven at 120° C. for 20 minutes; and measuring the square resistance of the prepared resistor coating using a four-probe square resistance tester to ensure that the square resistance error does not exceed 10%;

[0052] (3) Use silicon-based glue to bond the three-layer silica aerogel sheet.

[0053] Application Examples

[0054] like Figure 4 As shown, the reflectivity of the material prepared by the present invention measured in the 2.5-15.5 GHz frequency band at room temperature to 500° C. is lower than -10 dB, which means that the material prepared by the present invention can achieve an absorption rate of more than 90% within this temperature and frequency band.

[0055] Therefore, the laser-resistant and stealth-resistant integrated structure of the present invention and its preparation method and application can effectively absorb electromagnetic waves in the 2.5-15.5GHz frequency band within the high temperature range of room temperature to 500°C, with an absorption rate of more than 90%, and has excellent thermal isolation, high temperature resistance and high-energy laser ablation resistance. The structure can be widely used in occasions that need to defend against high-energy laser attacks to provide comprehensive protection.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A laser-resistant and stealth-integrated structure, characterized in that: It includes the following structures arranged from bottom to top: The bottom layer is an aluminum oxide layer, which serves as a mechanical support and provides laser resistance; The filling layer is a silica aerogel felt layer provided with a conductive oil film resistor coating to isolate or slow down the transfer of heat and absorb and reflect electromagnetic waves; The outer layer is a silicon dioxide sheet that reflects and initially absorbs laser energy and protects against laser ablation; The alumina layer includes a bottom edge and a hexagonal honeycomb structure arranged on the bottom edge, the hexagonal honeycomb structure and the bottom edge are an integrated structure, the silica aerogel felt is embedded in the honeycomb holes of the hexagonal honeycomb structure of the alumina layer, and the top is flush with the edge of the hexagonal honeycomb of the alumina layer.

2. The laser-resistant and stealth-integrated structure according to claim 1, characterized in that: The silica aerogel felt layer comprises a plurality of 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.

3. The laser-resistant and 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.

4. The laser-resistant and stealth-integrated structure according to claim 2, characterized in that: A conductive oil film resistor coating with a square resistance is printed on the top of each silica aerogel felt sheet. The pattern of the conductive oil film resistor coating is two concentrically arranged hexagonal rings with gaps. The square resistance of the conductive oil film resistor coating of the first layer of silica aerogel felt sheet is 50Ω / sq, the square resistance of the conductive oil film resistor coating of the second layer of silica aerogel felt sheet is 100Ω / sq, and the square resistance of the conductive oil film resistor coating of the third layer of silica aerogel felt sheet is 400Ω / sq. The bottom of the third layer of silica aerogel felt sheet is evenly covered with the conductive oil film resistor coating, and the square resistance of the conductive oil film resistor coating at the bottom is 100Ω / sq.

5. The laser-resistant and stealth-integrated structure according to claim 1, characterized in that: The bottom edge thickness of the aluminum oxide layer is 1.2 mm, the thickness of the hexagonal honeycomb structure is 6.0 mm, the thickness of the silicon dioxide aerogel felt layer is 6.0 mm, and the thickness of the silicon dioxide plate is 1.2 mm.

6. A method for preparing the laser-resistant-stealth integrated structure according to any one of claims 1 to 5, characterized in that: The alumina layer, the silica aerogel felt layer and the silica plate are all prepared into required sizes by laser cutting and then bonded and assembled.

7. The method for preparing a laser-resistant and stealth integrated structure according to claim 6, characterized in that: The aluminum oxide layer is prepared by using 3D printing technology to prepare aluminum oxide into a hexagonal honeycomb structure and then sintering it at a high temperature of 1500° C. in a resistance furnace for 3 hours.

8. The method for preparing a laser-resistant and stealth integrated structure according to claim 6, characterized in that: The preparation of the silica aerogel felt layer comprises the following steps: (1) Printing conductive oil film resistor coatings with different square resistance values ​​on the surface of the silica aerogel felt sheet by screen printing according to the assembly order, and printing the conductive oil film resistor coating on the bottom of the silica aerogel felt sheet placed on the third layer; (2) drying the printed silica aerogel felt sheet in an oven at 120° C. for 20 minutes; and measuring the square resistance of the prepared resistor coating using a four-probe square resistance tester to ensure that the square resistance error does not exceed 10%; (3) Use silicon-based glue to bond the three-layer silica aerogel sheet.

9. An application of the laser-resistant and stealth integrated structure as claimed in any one of claims 1 to 5, characterized in that: The anti-laser-stealth integrated structure is used in stealth and protection of aerospace and military equipment to resist high-energy laser attacks.

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