A composite shielding device
By using a composite structure consisting of a conductive elastic layer, a gradient impedance transition layer, a magnetoelectric coupling shielding layer, and a substrate support layer, combined with a plasma-activated grafted polymer interface layer, the problems of high-frequency attenuation, insufficient mechanical strength, and poor corrosion resistance of traditional electromagnetic shielding devices are solved, achieving wide-band electromagnetic shielding and improved corrosion resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KUNSHAN YUANHONGSHENG ELECTRONIC TECH CO LTD
- Filing Date
- 2025-07-07
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional electromagnetic shielding devices suffer from problems such as rapid attenuation of high-frequency shielding effectiveness, insufficient mechanical strength, and poor corrosion resistance.
A composite structure consisting of a conductive elastic layer, a gradient impedance transition layer, a magnetoelectric coupling shielding layer, and a substrate support layer is adopted, combined with a plasma-activated grafted polymer interface layer to achieve a multi-layer synergistic shielding mechanism for electromagnetic waves. Furthermore, the interlayer bonding strength and corrosion resistance are enhanced through gradient design and combination of materials.
It achieves wide-band electromagnetic shielding, improves high-frequency shielding effectiveness, enhances mechanical strength and corrosion resistance, and avoids delamination failure caused by differences in thermal expansion coefficients.
Smart Images
Figure CN224460401U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of shielding device technology, and in particular to a composite shielding device. Background Technology
[0002] Composite shielding devices refer to comprehensive protection systems formed by combining multiple materials or technologies. They are mainly used to block, absorb or weaken specific types of energy or substances (such as electromagnetic waves, radiation, sound waves, particle streams, etc.). Their core feature is to achieve more efficient and broader-spectrum shielding performance through the complementary effects of different materials.
[0003] Traditional electromagnetic shielding devices mostly use a single metal layer or conductive coating structure, which suffers from problems such as rapid attenuation of high-frequency shielding effectiveness, insufficient mechanical strength, and poor corrosion resistance. Therefore, we propose a composite shielding device. Utility Model Content
[0004] In view of the problems of rapid attenuation of high-frequency shielding effectiveness, insufficient mechanical strength and poor corrosion resistance of the existing composite shielding devices, this utility model is proposed.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0006] A composite shielding device includes a base, a composite shielding cover is installed on the outer surface of the base, and a removable waterproof and breathable membrane is provided on the outer surface of the composite shielding cover.
[0007] The composite shielding cover includes a conductive elastic layer, a gradient impedance transition layer, a magnetoelectric coupling shielding layer, and a substrate support layer arranged sequentially from the outside to the inside. The conductive elastic layer, the gradient impedance transition layer, the magnetoelectric coupling shielding layer, and the substrate support layer are bonded together by a plasma-activated grafted polymer interface layer.
[0008] As a technical solution of the composite shielding device of this utility model, the conductive elastic layer is made of silicone rubber, the thickness of the conductive elastic layer is 0.5-2mm, and the surface has a biomimetic corrugated microstructure.
[0009] As a technical solution of the composite shielding device of this utility model, the gradient impedance transition layer is composed of three coating layers, which are silver coating, nickel-iron alloy coating and zinc oxide coating from the outside to the inside, and the layer thickness ratio of the silver coating, the nickel-iron alloy coating and the zinc oxide coating is 3:2:1.
[0010] As a technical solution of the composite shielding device of this utility model, the magnetoelectric coupling shielding layer includes alternating layers of cobalt-based amorphous ribbon and polyvinylidene fluoride piezoelectric film, with a single layer thickness of 50-100μm and a total number of 5-7 layers.
[0011] As a technical solution of the composite shielding device of this utility model, the substrate support layer is a honeycomb aluminum core-carbon fiber reinforced epoxy resin composite structure, and its through holes are filled with carbonyl iron powder / graphene aerogel.
[0012] As a technical solution of the composite shielding device of this utility model, the polymer interface layer is an aminated silicon carbide nanowire.
[0013] As a technical solution of the composite shielding device of this utility model, an air gap layer is formed between the waterproof and breathable membrane and the conductive elastic layer, and the thickness of the air gap layer is 0.1-0.3mm.
[0014] Compared with the prior art, the present invention has at least the following beneficial effects:
[0015] 1. This utility model, through the composite structure of a conductive elastic layer, a gradient impedance transition layer, a magnetoelectric coupling shielding layer and a substrate support layer, can achieve a multi-synergistic shielding mechanism for electromagnetic wave reflection, absorption and dissipation, covering the requirements of wide-band electromagnetic shielding. At the same time, the plasma-activated grafted polymer interface layer can significantly improve the interlayer bonding strength and avoid delamination failure caused by the difference in thermal expansion coefficient.
[0016] 2. In this utility model, the gradient impedance transition layer is designed with resistivity gradient of silver plating, nickel-iron alloy plating and zinc oxide plating, which can achieve progressive matching of electromagnetic wave impedance, while reducing reflection loss and improving shielding effectiveness in the 1-10GHz frequency band.
[0017] 3. This utility model, by setting a magnetoelectric coupling shielding layer, wherein the high magnetic permeability of the cobalt-based amorphous ribbon and the dielectric loss of the polyvinylidene fluoride piezoelectric film form a magnetoelectric coupling effect, and the piezoelectric material is used to convert electromagnetic energy into mechanical vibration energy for secondary dissipation, which can improve the high-frequency shielding effectiveness.
[0018] 4. In this utility model, by setting a matrix support layer, the honeycomb aluminum core-carbon fiber reinforced epoxy resin composite structure can achieve an ultra-lightweight design, while the carbonyl iron powder / graphene aerogel filler enhances low-frequency absorption through magnetic hysteresis loss and interface polarization effect, which can endow the structure with acid and alkali corrosion resistance. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0021] Figure 2 This is a schematic diagram of the overall separable structure of this utility model.
[0022] Figure 3 This is a schematic diagram of the connection structure between the shielding layer structure and the waterproof and breathable membrane of this utility model.
[0023] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.
[0024] Explanation of reference numerals in the attached figures:
[0025] In the figure: 1. Base; 2. Composite shielding cover; 21. Conductive elastic layer; 221. Silver plating layer; 222. Nickel-iron alloy plating layer; 223. Zinc oxide plating layer; 231. Cobalt-based amorphous ribbon; 232. Polyvinylidene fluoride piezoelectric film; 24. Substrate support layer; 25. Polymer interface layer; 3. Waterproof and breathable membrane. Detailed Implementation
[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0027] Reference Figures 1-4 A composite shielding device is provided, which includes a base 1 made of 6061-T6 aluminum alloy with an anodized surface. A composite shielding cover 2 is installed on the outer surface of the base 1. The composite shielding cover 2 is bonded to the base 1 by a plasma activation grafting process. The plasma activation grafting process uses silicon carbide nanowires (50nm in diameter) for amination treatment. The ratio of Ar / O2 mixed gas during plasma activation is 4:1. The outer surface of the composite shielding cover 2 is provided with a detachable waterproof and breathable membrane 3.
[0028] The composite shield 2 includes a conductive elastic layer 21, a gradient impedance transition layer, a magnetoelectric coupling shield layer, and a substrate support layer 24 arranged sequentially from the outside to the inside. The conductive elastic layer 21, the gradient impedance transition layer, the magnetoelectric coupling shield layer, and the substrate support layer 24 are bonded together by a plasma-activated grafted polymer interface layer 25. In application, the composite structure of the conductive elastic layer 21, the gradient impedance transition layer, the magnetoelectric coupling shield layer, and the substrate support layer 24 achieves a multi-synergistic shielding mechanism for electromagnetic wave reflection, absorption, and dissipation, covering the requirements of wide-band electromagnetic shielding (from low-frequency magnetic fields to high-frequency electric fields). At the same time, the plasma-activated grafted polymer interface layer 25 can significantly improve the interlayer bonding strength and avoid delamination failure caused by differences in thermal expansion coefficients.
[0029] Reference Figure 3 and Figure 4 The conductive elastic layer 21 is made of silicone rubber doped with carbon nanotubes. The thickness of the conductive elastic layer 21 is 0.5-2mm, and the surface has a biomimetic corrugated microstructure. The silicone rubber is molded (pressure 15MPa, temperature 170℃) with a corrugation depth of 0.3mm. In application, the conductive elastic layer 21 made of silicone rubber has both elastic deformation capability and stable conductivity. At the same time, the biomimetic corrugated microstructure improves electromagnetic sealing by increasing the contact area, while buffering external impact loads, making it suitable for dynamic working conditions.
[0030] Reference Figure 3 and Figure 4 The gradient impedance transition layer consists of three layers deposited by magnetron sputtering. From the outside to the inside, they are a silver plating layer 221 (thickness 1.5 μm, sheet resistance 0.08 Ω / sq), a nickel-iron alloy plating layer 222 (thickness 1.0 μm, μr=120), and a zinc oxide plating layer 223 (thickness 0.5 μm, bandgap 3.37 eV). The thickness ratio of the silver plating layer 221, the nickel-iron alloy plating layer 222, and the zinc oxide plating layer 223 is 3:2:1. In applications, the gradient impedance transition layer, through the resistivity gradient design of the silver plating layer 221, the nickel-iron alloy plating layer 222, and the zinc oxide plating layer 223, can achieve progressive matching of electromagnetic wave impedance, while reducing reflection loss and improving shielding effectiveness in the 1-10 GHz frequency band.
[0031] Reference Figure 3 and Figure 4 The magnetoelectric coupling shielding layer comprises alternating layers of cobalt-based amorphous ribbon 231 and polyvinylidene fluoride piezoelectric film 232, with a single layer thickness of 50-100 μm and a total of 5-7 layers. In application, the high permeability of the cobalt-based amorphous ribbon 231 and the dielectric loss of the polyvinylidene fluoride piezoelectric film 232 form a magnetoelectric coupling effect. The electromagnetic energy is converted into mechanical vibration energy through the piezoelectric material for secondary dissipation, which can improve the high-frequency shielding effectiveness.
[0032] Reference Figure 3 and Figure 4 The matrix support layer 24 is a honeycomb aluminum core-carbon fiber reinforced epoxy resin composite structure. The honeycomb aluminum core is covered with carbon fiber / epoxy resin prepreg, and its through-holes are filled with carbonyl iron powder / graphene aerogel. The carbonyl iron powder / graphene aerogel is vacuum-infused to fill the through-holes. The carbonyl iron powder (particle size 5μm) and graphene oxide (concentration 8mg / mL) are supercritically dried. In application, the honeycomb aluminum core-carbon fiber reinforced epoxy resin composite structure achieves ultra-lightweight design, while the carbonyl iron powder / graphene aerogel filler enhances low-frequency absorption through hysteresis loss and interfacial polarization effect, and at the same time endows the structure with acid and alkali corrosion resistance.
[0033] Reference Figure 3 and Figure 4 The polymer interface layer 25 contains 3-5% by mass of aminated silicon carbide nanowires. In applications, the aminated silicon carbide nanowires are grafted through plasma activation, which can improve the interlayer shear strength.
[0034] Reference Figures 1-4 An air gap layer is formed between the waterproof and breathable membrane 3 (ePTFE membrane) and the conductive elastic layer 21. The ePTFE membrane is fixed by laser welding. The thickness of the air gap layer is 0.1-0.3mm. Dielectric resonant units are periodically arranged in the gap. In application, the air gap layer forms an additional electromagnetic wave reflection interface. Combined with the hydrophobic angle characteristics of the waterproof and breathable membrane 3, it can control the water vapor permeability and avoid electrochemical corrosion caused by condensation in traditional sealing structures.
[0035] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A composite shielding device, characterized by: Includes a base (1), on the outer surface of which a composite shield (2) is installed, and on the outer surface of which a removable waterproof and breathable membrane (3) is provided; The composite shield (2) includes a conductive elastic layer (21), a gradient impedance transition layer, a magnetoelectric coupling shield layer and a substrate support layer (24) arranged sequentially from the outside to the inside. The conductive elastic layer (21), the gradient impedance transition layer, the magnetoelectric coupling shield layer and the substrate support layer (24) are bonded together by a plasma-activated grafted polymer interface layer (25).
2. The composite shielding device of claim 1, wherein: The conductive elastic layer (21) is made of silicone rubber, and the thickness of the conductive elastic layer (21) is 0.5-2 mm, and the surface has a biomimetic corrugated microstructure.
3. The composite shielding device of claim 1, wherein: The gradient impedance transition layer consists of three coating layers, which are silver plating (221), nickel-iron alloy plating (222) and zinc oxide plating (223) from the outside to the inside. The thickness ratio of the silver plating (221), the nickel-iron alloy plating (222) and the zinc oxide plating (223) is 3:2:
1.
4. The composite shielding device of claim 1, wherein: The magnetoelectric coupling shielding layer comprises alternating layers of cobalt-based amorphous ribbon (231) and polyvinylidene fluoride piezoelectric film (232), with a single layer thickness of 50-100 μm and a total number of 5-7 layers.
5. The composite shielding device of claim 1, wherein: The matrix support layer (24) is a honeycomb aluminum core-carbon fiber reinforced epoxy resin composite structure, and its through holes are filled with carbonyl iron powder / graphene aerogel.
6. The composite shielding device of claim 1, wherein: The polymer interface layer (25) is an aminated silicon carbide nanowire.
7. The composite shielding device of any of claims 1-6, wherein: An air gap layer is formed between the waterproof and breathable membrane (3) and the conductive elastic layer (21), and the thickness of the air gap layer is 0.1-0.3 mm.