Embedded metal mesh multifunctional infrared carbon-based composite film

Abstract

The utility model discloses an embedded metal mesh multifunctional infrared carbon-based composite film, and belongs to the technical field of infrared antireflection films. The embedded metal mesh multifunctional infrared carbon-based composite film is composed of a base material, a metal mesh, a diamond-like layer, a graphite-like conductive layer and a conductive coating layer. The metal mesh is embedded in the base material, diamond-like layers and graphite-like conductive layers are sequentially and alternately arranged above the base material, the outermost layer is the diamond-like layer, all the diamond-like layers and the graphite-like conductive layers are coated with conductive coating layers, and the multiple graphite-like conductive layers are electrically connected into a parallel structure through the conductive coating layers; the composite film is suitable for selection of an infrared band, a metal mesh embedded structure and a carbon-based material, the mechanical strength of the composite film is improved, the composite film has a protection function, meanwhile, the composite film can be used as an electric heating film under the condition that no additional electrode is needed, and the composite film has a better shielding effect through a parallel structure and a microwave resonant cavity structure.

Description

Technical Field

[0001] This invention relates to the field of infrared antireflective film technology, specifically the embedded metal mesh multifunctional infrared carbon-based composite film. Background Technology

[0002] Radar stealth window structures involve fabricating periodically arrayed or randomly arranged conductive metal meshes on the surface of an optical window substrate, followed by the fabrication of an anti-reflection protective layer. The thickness of the mesh and anti-reflection protective layer in this structure is typically in the micrometer or submicrometer range. However, the lattice constant and expansion coefficient of the metal mesh differ from those of the substrate material, which is detrimental to the adhesion, thermal shock resistance, and laser damage resistance of the coated metal mesh. Under service conditions such as wind, sand, and rain, the film layer is easily damaged, resulting in a shorter lifespan for radar stealth windows of this structure.

[0003] To address the aforementioned issues, the invention patent application No. 2023118601539, "A Multi-band Radar Stealth Composite Structure Optical Window and Its Preparation Method," provides a solution. This multi-band radar stealth composite structure optical window, from bottom to top, consists of an optical window substrate, a conductive metal mesh, a protective layer, and an anti-reflective protective film. The conductive metal mesh is periodically distributed on the upper surface of the optical window substrate. The protective layer is made of the same material as the optical window substrate. The anti-reflective film is multi-layered, and the distance between adjacent anti-reflective films gradually decreases as it extends outwards. Compared to traditional optical windows, this multi-band radar stealth composite structure optical window has higher light transmittance and mechanical strength, thus able to withstand harsh environments such as high and low temperatures, humidity, salt spray, mold, and dust. Analyzing the manufacturing process, the above technical solution is equivalent to processing the conductive metal mesh on the window surface and then wrapping it with an anti-reflective film, achieving isolation between the mesh and the external environment.

[0004] Furthermore, the invention patent application No. 2023106557395, entitled "A Method for Manufacturing an Embedded Electromagnetic Shielding Metal Mesh", involves the following steps in sequence: fabricating a reverse mask on an optical substrate, etching metal mesh grooves with a plasma beam, depositing a metal thin film, depositing a bottom thin film, removing adhesive and cleaning, and depositing an optical antireflective film with environmental corrosion resistance. This manufacturing process involves etching grooves on the window surface, processing the metal mesh inside the grooves, and then sealing the grooves with an antireflective film, thereby isolating the mesh from the external environment and enabling the optical window to simultaneously achieve multiple functions such as electromagnetic shielding, good optical transmittance, and resistance to environmental corrosion.

[0005] It is evident that using multilayer composite films to isolate metal mesh from the external environment is an effective means to improve the optical performance and environmental tolerance of loaded metal mesh windows, and existing technologies have proven that embedding metal mesh in a substrate is a feasible process.

[0006] The invention patent application No. 2022107784103, entitled "An Infrared Transparent Conductive Carbon-Based Thin Film and Its Preparation Method", provides a carbon-based thin film with the same protective function for the infrared band and gives the manufacturing process, explaining the feasibility of sandwiching a graphite-like conductive layer between two diamond-like layers. Summary of the Invention

[0007] Based on the technology that metal mesh can isolate the external environment and graphite-like conductive layers can be sandwiched between two diamond-like layers, and using our invention patent application No. 2024116448543, "Visible Light Range Optical Anti-reflection Protection Electromagnetic Shielding Functional Composite Film", we have designed an embedded metal mesh multifunctional infrared carbon-based composite film, which is suitable for the infrared band. It can not only achieve the same technical purpose of isolating the metal mesh from the external environment, but also has a simple structure and rich functions.

[0008] The objective of this invention is achieved as follows:

[0009] An embedded metal mesh multifunctional infrared carbon-based composite film is composed of a substrate, a metal mesh, a diamond-like carbon (DLC) layer, a graphite-like conductive layer, and a conductive coating layer. The metal mesh is embedded in the substrate. Above the substrate, the DLC layer and the graphite-like conductive layer alternately in sequence, with the outermost layer being the DLC layer. The DLC layer and the graphite-like conductive layer have the same projected area. A conductive coating layer covers all the DLC layer and the graphite-like conductive layer. Multiple graphite-like conductive layers are electrically connected in parallel by the conductive coating layer.

[0010] The beneficial effects of the embedded metal mesh multifunctional infrared carbon-based composite film of the present invention are as follows:

[0011] First, by selecting carbon-based materials for the diamond-like carbon layer and the graphite-like conductive layer, the composite film of this invention is suitable for the infrared band.

[0012] Secondly, the metal mesh is embedded in the substrate, which also isolates the metal mesh from the external environment, so as to achieve the technical purpose of higher mechanical strength and the ability to withstand harsh environments.

[0013] Third, the outermost layer is a diamond-like carbon layer, and the conductive coating layer is made of ITO or indium oxide. Both materials have high hardness, which enables the composite film of the present invention to serve as a protective film and improve the environmental tolerance of optical devices.

[0014] Fourth, the conductive coating layer connects the graphite-like conductive layer, so that the conductive coating layer itself can act as an electrode, and the composite film of the present invention can act as an electric heating film without the need for an external electrode.

[0015] Fifth, the metal mesh layer is patterned, which gives the composite film of the present invention electromagnetic shielding function; in addition, multiple graphite-like conductive layers are connected in parallel by conductive coating layers, and the resistivity of the parallel structure is much lower than that of the single-layer structure, thus greatly improving the shielding effectiveness.

[0016] Sixth, a microwave resonant cavity is formed between the metal mesh and the closest graphite-like layer. By adjusting the embedding depth of the metal mesh, i.e., changing the distance between the metal mesh and the closest graphite-like layer, a better shielding effect can be achieved at a specific distance for a specific spectral band based on the principle of resonant absorption. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the embedded metal mesh multifunctional infrared carbon-based composite film of the present invention.

[0018] In the diagram: 1. Substrate, 2. Metal mesh, 3. Diamond layer, 4. Graphite conductive layer, 5. Conductive coating layer. Detailed Implementation

[0019] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Method 1

[0021] The following are specific embodiments of the embedded metal mesh multifunctional infrared carbon-based composite film of the present invention.

[0022] The structural schematic diagram of the embedded metal mesh multifunctional infrared carbon-based composite film in this specific embodiment is shown below. Figure 1 As shown, it is composed of a substrate 1, a metal mesh 2, a diamond-like carbon layer 3, a graphite-like conductive layer 4, and a conductive coating layer 5. The metal mesh 2 is embedded in the substrate 1. Above the substrate 1, the diamond-like carbon layer 3 and the graphite-like conductive layer 4 are alternately arranged in sequence, with the outermost layer being the diamond-like carbon layer 3. The projected areas of the diamond-like carbon layer 3 and the graphite-like conductive layer 4 are the same. A conductive coating layer 5 covers all the diamond-like carbon layer 3 and the graphite-like conductive layer 4. Multiple graphite-like conductive layers 4 are electrically connected in parallel by the conductive coating layer 5.

[0023] Method 2

[0024] The following are specific embodiments of the embedded metal mesh multifunctional infrared carbon-based composite film of the present invention.

[0025] In this specific embodiment, the embedded metal mesh multifunctional infrared carbon-based composite film has a conductive coating layer 5 made of ITO or indium oxide.

[0026] Method 3

[0027] The following are specific embodiments of the preparation method of the embedded metal mesh multifunctional infrared carbon-based composite film of the present invention.

[0028] The preparation method of the embedded metal mesh multifunctional infrared carbon-based composite film according to this specific embodiment includes the following steps:

[0029] Step a: Embed the metal mesh 2 into the substrate 1;

[0030] Step b: A diamond-like layer 3 and a graphite-like conductive layer 4 are sequentially prepared on substrate 1 to form a multilayer structure;

[0031] Step c: On the periphery of the multilayer structure, a conductive coating layer 5 is used to coat the multilayer structure. All graphite-like conductive layers 4 are electrically connected to the conductive coating layer 5 to form a parallel structure of multiple graphite-like conductive layers 4.

Claims

1. An embedded metal mesh multifunctional infrared carbon-based composite film, characterized in that, It is composed of a substrate (1), a metal mesh (2), a diamond-like carbon layer (3), a graphite-like conductive layer (4), and a conductive coating layer (5); the metal mesh (2) is embedded in the substrate (1), and the diamond-like carbon layer (3) and the graphite-like conductive layer (4) are alternately arranged on the substrate (1), with the outermost layer being the diamond-like carbon layer (3). The diamond-like carbon layer (3) and the graphite-like conductive layer (4) have the same projected area. A conductive coating layer (5) covers all the diamond-like carbon layers (3) and the graphite-like conductive layer (4). Multiple graphite-like conductive layers (4) are electrically connected in parallel by the conductive coating layer (5).

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