Structural stealth integrated variable-characteristic superstructure composite material based on amorphous wire and method

Abstract

The invention discloses a structural stealth integrated variable-characteristic superstructure composite material based on amorphous wires and a method, and belongs to the field of structural function integrated composite materials. The super-structure composite material is of a multi-layer structure integrally formed by adopting high-temperature epoxy resin through a vacuum resin transfer molding process. In the multi-layer structure, from top to bottom, the first layer is an amorphous wire array layer, the second layer and the third layer are square ring-shaped metasurface layers, and the fourth layer to the twentieth layer are glass fiber cloth layers. The super-structure composite material has the functions of radar stealth, external field intelligent adjustment, tensile resistance, impact resistance and high temperature resistance, and the preparation method of the super-structure composite material is simple in technological process, convenient to operate and low in raw material cost.

Description

Technical Field

[0001] The present invention belongs to the field of structural-functional integrated composite materials, and specifically relates to a design and preparation method of a structural-stealth integrated variable-property super-composite material that has radar stealth, intelligent adjustable performance under external fields, tensile and impact resistance, and high temperature resistance. Background Art

[0002] In the field of modern national defense and civil communications, various advanced electromagnetic equipment emerges in an endless stream, and the electromagnetic interference and radiation problems that follow make the development of high-performance stealth materials a focus of attention. Commonly used traditional stealth / absorbent materials are mainly divided into absorbers and absorbent structures. The main absorption mechanism of absorbers depends on the magnetic loss and dielectric loss caused by intrinsic electromagnetic parameters, and there is a problem of narrow absorption bandwidth. Traditional absorbent structures represented by absorbing cones are difficult to meet the requirements of low profiles due to the need to achieve broadband impedance matching. In recent years, artificial electromagnetic metamaterials formed by periodic arrangement of subwavelength units have received widespread attention in the field of stealth due to their unique double negative characteristics and clear "structure-performance" correspondence. However, traditional electromagnetic stealth metamaterials have the problems of low mechanical properties and poor environmental adaptability. In particular, in the face of overload and high temperature in the service environment of weapons and equipment and rail transportation, the stealth resonant unit of the metamaterial will fail due to deformation, significantly reducing the service life. In addition, the fixed electromagnetic functional response limits the application of metamaterials in the field of intelligent stealth devices. Therefore, it is necessary to design and prepare a structural stealth integrated meta-composite material that has radar stealth, excellent mechanical properties, good thermal stability, and external field adjustable characteristics to meet the needs of engineering applications.

[0003] In recent years, amorphous wires have attracted extensive attention from researchers due to their excellent magnetic properties such as magnetocrystalline anisotropy, high-frequency soft magnetic properties, giant magnetoimpedance / giant stress impedance effect and various magnetoelectric resonance effects, and have been widely used in sensing, structural health detection and other fields. In addition, amorphous wires have excellent comprehensive performance and highly sensitive external field (magnetic field, force field, temperature field) magnetic adjustability, and have great potential to become a new generation of electromagnetic functional fillers in electromagnetic intelligent engineering application scenarios. It can be used in many engineering scenarios, providing the possibility of designing and realizing new electromagnetic variable characteristic components. Therefore, the design and preparation of electromagnetic stealth metamaterials based on amorphous wires has great prospects in achieving radar stealth, impact resistance, high temperature resistance and external field adjustability. Summary of the invention

[0004] Since traditional electromagnetic stealth metamaterials have the problems of not being resistant to high temperatures, poor mechanical properties of the substrate, single function, and lack of intelligent adjustability, the purpose of the present invention is to overcome the defects in the prior art and provide a structural stealth integrated variable property meta-composite material and method based on amorphous wire, aiming to ensure good thermal stability, tensile properties and impact resistance while achieving radar stealth and external field adjustable functions.

[0005] The specific technical solutions adopted by the present invention are as follows:

[0006] In the first aspect, the present invention provides a structural stealth integrated variable property meta-composite material based on amorphous wires, wherein the meta-composite material is a multi-layer structure integrally formed by a vacuum resin transfer molding process using a high-temperature epoxy resin; in the multi-layer structure, in order from top to bottom, the first layer is an amorphous wire array layer, the second and third layers are both square ring-shaped meta-surface layers, and the fourth to twentieth layers are all glass fiber cloth layers.

[0007] Preferably, the amorphous wire array layer comprises an amorphous wire array and glass fiber cloth, and the amorphous wire array is arranged on the lower bottom surface of the glass fiber cloth by a wire laying method; the amorphous wire array is obtained by arranging glass-coated ferromagnetic amorphous wires in parallel with equal intervals.

[0008] Furthermore, the spacing between adjacent glass-coated ferromagnetic amorphous wires is 7 mm; the glass-coated ferromagnetic amorphous wire is a ferromagnetic metal core with an outer layer coated with Pyrex high borosilicate glass, and the average resistivity is 2.7×10 -5 Ω / m, the average single-filament tensile strength reaches 920MPa, and the initial crystallization temperature reaches 500℃.

[0009] Furthermore, the ferromagnetic metal core is prepared by the Taylor-Ulitovsky method, has an outer diameter of 80 μm, an inner diameter of 60 μm, and a composition of Fe 77 Si 10 B 10 C3.

[0010] Preferably, the square ring-shaped super surface layer is produced by printing conductive carbon paste on the bottom surface of a single layer of glass fiber cloth according to a square ring-shaped super surface pattern using a screen printing process and then drying it.

[0011] Furthermore, the outer side length of the square ring-shaped supersurface pattern is 5 mm, the inner side length is 3 mm, and the structural unit period is 7 mm.

[0012] Furthermore, the mesh number of the screen printing plate used in the screen printing process is 300 meshes, and the resistance value of the conductive carbon paste is 45Ω / □.

[0013] Preferably, the glass fiber cloth layer is glass fiber cloth and has isotropy.

[0014] In a second aspect, the present invention provides a method for preparing a structural stealth integrated variable property meta-composite material based on amorphous wire as described in any one of the first aspects, which is specifically as follows:

[0015] The amorphous wire array layer is prepared by the wire laying method, and the square ring-shaped supersurface layer is prepared by the screen printing process; in order from top to bottom, the first layer is the amorphous wire array layer, the second and third layers are both square ring-shaped supersurface layers, and the fourth to twentieth layers are all glass fiber cloth layers. After laying them in sequence, the twenty layers of materials are integrated into one by one using high-temperature epoxy resin through a vacuum resin transfer molding process to obtain a structural stealth integrated variable property meta-composite material based on amorphous wire.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) In terms of temperature resistance, the present invention introduces wave-transmitting high-performance glass fiber cloth and heat-resistant resin to enable the use temperature to reach 160°C and above, and has excellent temperature resistance.

[0018] (2) In terms of tensile properties, the present invention uses a high-performance glass fiber cloth matrix and adopts the VARTM process for integrated molding, so that the tensile strength of the super-composite material at room temperature can reach 570.51 MPa, and it has excellent tensile resistance.

[0019] (3) In terms of impact performance, the present invention uses high-performance glass fiber cloth to reinforce the matrix and adopts VARTM process for integrated molding, so that when the meta-composite material is impacted, the damage will gradually and stably diffuse inside. The final average impact peak force that can be achieved is 7.1 kN, and the average energy dissipation ratio is 40%, which has good impact resistance.

[0020] (4) In terms of stealth performance, the present invention uses the synergistic effect of amorphous wire arrays and square ring metasurfaces to jointly dissipate electromagnetic waves through multiple absorption mechanisms, so that the metacomposite material achieves good absorption performance in the X-band. The absorption rate of the metacomposite material in the entire X-band is ≥ 60% (-4dB), and the minimum reflection loss value in the X-band can reach -16.69dB, which has good stealth performance.

[0021] (5) In terms of variable characteristic performance, the meta-composite material obtained by the present invention can achieve wide bandwidth absorption peak regulation under magnetic field excitation, which is specifically manifested as follows: with the increase of magnetic field intensity, the absorption peak of the amorphous wire meta-composite material undergoes a significant blue shift, and a regulation range of 3.36 GHz can be achieved; in addition, the meta-composite material obtained by the present invention can also achieve wide bandwidth absorption peak regulation under temperature field excitation, which is specifically manifested as follows: with the increase of temperature, the absorption peak of the amorphous wire meta-composite material undergoes a significant red shift, and a regulation range of 2.02 GHz can be achieved, and it has good variable characteristic characteristics.

[0022] (6) The present invention provides a resin-based fiber-reinforced meta-composite material based on an amorphous wire array and combined with a square resistance resonance unit metasurface, which not only has excellent electromagnetic wave absorption performance, but also has excellent comprehensive performance: tensile performance, impact resistance and thermal stability. In addition, it can also realize variable characteristic functions that can be adjusted by the external field, and can play an important role in the development and design of new variable characteristic electromagnetic stealth components in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the preparation process of a structural stealth integrated variable property meta-composite material based on amorphous wire proposed in the present invention.

[0024] Figure 2 The simulation design optimization and experimental verification results of the structural stealth integrated variable-property meta-composite material based on amorphous wire proposed in the present invention, wherein (a) is the simulation result of the influence of matrix thickness on the return loss; (b) is the test result of the return loss of meta-composite materials with different numbers of layers based on the simulation results; and (c) is a schematic diagram of the simulation model.

[0025] Figure 3 This is a schematic diagram of the structure of a structural stealth integrated variable property meta-composite material based on amorphous wire proposed in the present invention, wherein 1-amorphous wire array layer, 2-square ring metasurface layer, 3-glass fiber cloth layer, a-300mm, b-3.8mm, c-7mm, d-5mm, e-3mm.

[0026] Figure 4 This is a thermal stability test analysis of a preferred embodiment of the present invention, wherein (a) is a DMA test curve; (b) is a DSC test curve.

[0027] Figure 5 The warp and weft room temperature tensile stress-displacement curves of a preferred embodiment of the present invention, wherein (a) is the warp (axial direction of amorphous wire) tensile curve; (b) is the weft (radial direction of amorphous wire) tensile curve.

[0028] Figure 6This is the longitudinal (axial direction of amorphous wire) tensile stress-displacement curve under variable temperature conditions of a preferred embodiment of the present invention.

[0029] Figure 7 The impact test results of the preferred embodiment of the present invention, wherein (a) is the force-time curve of the sample; (b) is the energy-time curve of the sample; (c) is the force-displacement curve of the sample; and (d) is an optical photograph of the sample after impact.

[0030] Figure 8 FIG. 4 is a return loss curve of a preferred embodiment of the present invention.

[0031] Fig. 9 The absorption peak regulation of the preferred embodiment of the present invention under magnetic field excitation conditions, wherein (a) is the absorption rate curve of the preferred example of the present invention versus magnetic field; (b) is the relative frequency shift of the absorption peak under magnetic field excitation conditions.

[0032] Fig.10 The absorption peak regulation of the preferred embodiment of the present invention under the temperature field excitation condition, wherein (a) is the return loss change curve of the preferred example of the present invention with the temperature field; (b) is the relative frequency shift of the absorption peak under the temperature field excitation condition. DETAILED DESCRIPTION

[0033] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0034] The present invention provides a structural stealth integrated variable property meta-composite material based on amorphous silk, which has radar stealth, intelligent and adjustable external field, tensile and impact resistance, and high temperature resistance. The preparation method of the meta-composite material has a simple process flow, is easy to operate, and has low raw material cost.

[0035] In the present invention, the meta-composite material is a multi-layer structure integrally formed by vacuum resin transfer molding (VARTM) process using high temperature epoxy resin. In the multi-layer structure, there are 20 layers in order from top to bottom, wherein the first layer is an amorphous wire array layer, the second layer and the third layer are both square ring meta-surface layers, and the fourth layer to the twentieth layer are all glass fiber cloth layers.

[0036] As a preferred embodiment of the present invention, the amorphous wire array layer includes an amorphous wire array and a glass fiber cloth, and the amorphous wire array is arranged on the bottom surface of the glass fiber cloth by a wire laying method, wherein the amorphous wire array is obtained by arranging glass-coated ferromagnetic amorphous wires in parallel at equal intervals. In other words, the amorphous wire array layer includes a single layer of glass fiber cloth and an amorphous wire array arranged from top to bottom, wherein the amorphous wire array is arranged on the single layer of glass fiber cloth.

[0037] It should be noted that the amorphous wire array is arranged on the lower bottom surface of the glass fiber cloth in order to illustrate that in the multi-layer structure of the meta-composite material, one side of the glass fiber cloth carrying the amorphous wire array is located at the bottom, and the other side of the glass fiber cloth is located at the top surface of the multi-layer structure (i.e., the topmost layer). In the process of preparing the amorphous wire array layer by the wire laying method, the amorphous wires are still laid on the upper surface of the glass fiber cloth for ease of operation.

[0038] As a preferred embodiment of the present invention, the spacing between two adjacent glass-coated ferromagnetic amorphous wires is 7 mm, that is, an amorphous wire array arranged in parallel on a single layer of glass fiber cloth with a spacing of 7 mm is prepared by a manual wire laying method to form an amorphous wire array layer. The glass-coated ferromagnetic amorphous wire is a ferromagnetic metal core with a Pyrex high borosilicate glass coated on the outer layer; the amorphous wire has good resistance performance, and the average resistivity is 2.7×10 -5 Ω / m; amorphous wire also has good tensile properties, the average single wire tensile strength reaches 920Mpa; amorphous wire has good thermal stability, and the initial crystallization temperature reaches 500℃.

[0039] As a preferred embodiment of the present invention, the ferromagnetic metal core is prepared by the Taylor-Ulitovsky method, has an outer diameter of 80 μm, an inner diameter of 60 μm, and a composition of Fe 77 Si 10 B 10 C3.

[0040] In actual use, the preparation method of the amorphous wire array layer is as follows:

[0041] S1: Material preparation: Cut the fiberglass cloth into a size of 310 mm × 320 mm, and stick paper tape on one set of opposite sides of the fiberglass cloth, and stick double-sided tape on the paper tape.

[0042] S2: Wire laying: Cut the glass-coated ferromagnetic amorphous wire into suitable lengths, fix the two ends on the double-sided tape on the two opposite sides of the glass fiber cloth, and paste them in parallel and equidistant arrangements.

[0043] As a preferred embodiment of the present invention, the square ring-shaped super surface layer is made by using a screen printing process, printing a conductive carbon paste on the bottom surface of a single layer of glass fiber cloth according to a square ring-shaped super surface pattern, and then drying it.

[0044] It should be noted that the square ring-shaped supersurface pattern is printed on the bottom surface of a single-layer glass fiber cloth to illustrate that in the multi-layer structure of the meta-composite material, one side of the glass fiber cloth provided with the square ring-shaped supersurface pattern is located below the layer, and the other side of the glass fiber cloth is located above the layer of the multi-layer structure. In the process of preparing the square ring-shaped supersurface layer by screen printing, the square ring-shaped supersurface pattern is still printed on the upper surface of the glass fiber cloth for ease of operation. In other words, the glass fiber cloth printed with the square ring-shaped supersurface is located on the second and third layers of the structural stealth integrated variable property meta-composite material, and the two layers of the square ring-shaped supersurface pattern are sandwiched between the second and third layers, and the third and fourth layers of the plain glass fiber cloth. In other words, the square ring-shaped supersurface layer includes a single layer of glass fiber cloth and a square ring-shaped supersurface pattern arranged from top to bottom, wherein the square ring-shaped supersurface pattern is arranged on the single layer of glass fiber cloth.

[0045] As a preferred embodiment of the present invention, the outer side length of each square ring unit in the square ring metasurface pattern is 5 mm, the inner side length is 3 mm, and the structural unit period is 7 mm. The size of the screen printing plate used in the screen printing process is 300 mm × 300 mm, and the mesh number is 300 meshes; the resistance of the conductive carbon paste used is 45Ω / □.

[0046] In actual use, the preparation method of the square ring-shaped super surface layer is as follows:

[0047] S1: Material preparation: prepare glass fiber cloth of appropriate size, screen printing plate, scraper, and conductive carbon paste.

[0048] S2: Scrape printing pattern: Use a scraper to scrape the screen printing plate to evenly print the conductive carbon paste on the surface of the glass fiber cloth.

[0049] S3: Drying and curing: The glass fiber cloth printed with the square ring-shaped super surface pattern is placed in an oven preheated to 135°C for drying. After drying for 10 minutes, the glass fiber cloth is cut into 310 mm × 320 mm to obtain a square ring-shaped super surface layer.

[0050] As a preferred embodiment of the present invention, the glass fiber cloth layer is glass fiber cloth, which is made of high-performance glass fiber (produced by CSG Research Institute) and has isotropy. In this embodiment, the size of the 17 layers of glass fiber cloth laid from the fourth layer to the twentieth layer is 310mm×320mm.

[0051] In this embodiment, if Figure 3As shown, the amorphous wire array layer 1 includes a layer of glass fiber cloth and parallel amorphous wires pasted on the back of the glass fiber cloth; two layers of square ring-shaped super surface layer 2 are laid under the amorphous wire array layer 1, and the square ring-shaped super surface layer 2 includes a layer of glass fiber cloth and a square ring-shaped super surface printed on the back of the glass fiber cloth; a total of seventeen layers of glass fiber cloth layer 3 are laid from the fourth layer to the twentieth layer, and after laying, high-temperature epoxy resin is poured and cured by VARTM process to form an integral body. Among them, the meta-composite material sample is a rectangle with a side length of 300mm, that is, a=300mm; the overall thickness b of the twenty layers of meta-composite material is 3.8mm; the spacing between two adjacent glass-coated ferromagnetic amorphous wires is 7mm, that is, c=7mm; the outer side length d of each square ring unit square ring in the square ring super surface pattern is 5mm, and the inner side length e is 3mm.

[0052] In the meta-composite material of the present invention, the first layer is an amorphous wire array layer, the second and third layers are square ring-shaped super surface layers, and the fourth to twentieth layers are glass fiber cloth layers, totaling twenty layers, for the following reasons:

[0053] Based on the structural parameters and electrical performance parameters of the glass-coated ferromagnetic amorphous wire used in the metacomposite material of the present invention, CST Studio Suite 2020 is used to simulate the electromagnetic response of the amorphous wire array and the square ring metasurface embedded in the resin-based composite material in the X-band, so as to optimize the stealth performance of the ferromagnetic amorphous wire metacomposite material. The simulation model is as follows: Figure 2 (c) As shown. The stealth performance of the meta-composite material with different matrix thicknesses (i.e. b = 2.28 mm, b = 3.80 mm, b = 4.75 mm) was simulated and analyzed. The simulation results are shown in Figure 2 (a). The simulation results show that as the thickness of the matrix increases, the loss capacity of the meta-composite material to electromagnetic waves first increases and then decreases, and reaches the strongest at a thickness of twenty layers (i.e., b = 3.80 mm); and as shown in Table 1, considering the -4dB bandwidth and -8dB bandwidth, the stealth performance of the meta-composite material is more excellent when the matrix thickness is 3.80 mm. In addition, the present invention also prepares and tests the stealth performance of the meta-composite material with different thicknesses obtained by simulation design, and the test results are shown in Figure 2(b) As shown in Table 2. The experimental results show that as the thickness of the matrix increases, the loss capacity of the meta-composite material to electromagnetic waves first increases and then decreases, and reaches the strongest at a thickness of twenty layers, which is consistent with the simulation results. In addition, due to the high viscosity of the high-temperature epoxy resin used in the present invention during the integrated molding of the meta-composite material, the thickness of the glass fiber cloth that can be completely impregnated within its operating time range is limited. If a larger number of layers are used to prepare the meta-composite material, the resin impregnation will be incomplete, thereby affecting the comprehensive mechanical properties of the meta-composite material. Therefore, based on the above simulation and experimental test results and combined with the limitations of the actual molding process, the first layer is an amorphous wire array layer, the second and third layers are square ring super surface layers, and the fourth to twentieth layers are glass fiber cloth layers, totaling twenty layers, are used to prepare the meta-composite material.

[0054] Table 1 Simulation design optimization related data results

[0055]

[0056] Table 2 Experimental verification test results of simulation design optimization

[0057]

[0058] The present invention also provides a method for preparing a structural stealth integrated variable property meta-composite material based on amorphous wire, which is specifically as follows:

[0059] The amorphous wire array layer is prepared by the wire laying method, and the square ring-shaped supersurface layer is prepared by the screen printing process; in order from top to bottom, the first layer is the amorphous wire array layer, the second and third layers are both square ring-shaped supersurface layers, and the fourth to twentieth layers are all glass fiber cloth layers. After laying them in sequence, the twenty layers of materials are integrated into one by one using high-temperature epoxy resin through a vacuum resin transfer molding process to obtain a structural stealth integrated variable property meta-composite material based on amorphous wire.

[0060] In actual use, Figure 1 As shown, the steps are as follows:

[0061] S1: Composite material laying, laying one amorphous wire array layer, two square ring super surface layers, seventeen glass fiber cloth layers, and integrated molding process auxiliary materials on the mold in sequence.

[0062] S2: A vacuum film is pasted around the mold covered with multiple layers of materials to seal it.

[0063] S3: The laid multi-layer materials are evacuated and injected with resin, and after curing and molding, a structural stealth integrated variable property meta-composite material is obtained.

[0064] As a preferred embodiment of the present invention, the preparation method comprises the following steps:

[0065] S1: Material preparation: prepare high temperature epoxy resin A glue, high temperature epoxy resin B glue, mold, demoulding cloth, guide net, sealant, vacuum bag, resin guide tube, guide spiral tube, guide tube clamp, silicone joint, vacuum pump, and resin collection tank.

[0066] S2: Laying: Place one amorphous wire array layer, two square ring-shaped super surface layers, seventeen glass fiber cloth layers, release cloth, and guide net on the mold in sequence, wherein the amorphous wire array layer has amorphous wires on its side facing upward, and the square ring-shaped super surface layer has a square ring pattern printed on its side facing upward.

[0067] S3: Arrange vacuum guide pipes and stick vacuum bags on the laminate structure to ensure good vacuum degree in the laminate structure.

[0068] S4: After uniformly mixing high-temperature epoxy resin A glue and high-temperature epoxy resin B glue in a ratio of 4:1, turn on the vacuum pump to pour the resin into the vacuum bag until the laminate structure is completely infiltrated with the high-temperature epoxy resin.

[0069] S5: Place the mold filled with high-temperature epoxy resin in a preheated oven for gradient temperature curing. The curing temperature is 50°C for 1 hour, and then the temperature is raised to 150°C and cured for 1 hour, and finally a structural stealth integrated variable property meta-composite material based on amorphous wire is obtained.

[0070] The following experimental verification was carried out on the meta-composite material prepared in the above steps S1 to S5.

[0071] The thermal stability test of the metacomposite material obtained in this embodiment was carried out, and the test curves of loss tangent tanδ, loss modulus E″ and storage modulus E′ varying with temperature were obtained by dynamic mechanical analysis (DMA). Figure 4 (a) It can be seen that the present embodiment can maintain stable performance in a wide temperature range. The glass transition temperature T of the present embodiment is determined by differential scanning calorimetry (DSC). g ,like Figure 4 (b) It can be seen that the glass transition temperature T g It is 163.41°C, which shows that the operating temperature of the meta-composite material prepared in the embodiment of the present invention can reach 160°C or above.

[0072] The tensile properties of the meta-composite material obtained in this embodiment were tested at room temperature to obtain a stress-displacement curve of the meta-composite material. Figure 5It can be seen that the tensile strength of the meta-composite material in the warp direction (axial direction of the amorphous wire) and the weft direction (radial direction of the amorphous wire) can reach 479.97±48.03MPa and 570.51±14.61MPa, respectively, which shows that the meta-composite material prepared in the embodiment of the present invention has good tensile properties at room temperature.

[0073] The tensile properties of the meta-composite material obtained in this embodiment were tested under temperature conditions. The stress-displacement curves of the meta-composite material were obtained by testing at room temperature, 85°C, 120°C, and 150°C. Figure 6 It can be seen that although the tensile properties are weakened compared with the tensile properties at room temperature as the ambient temperature rises, they can still reach 280 MPa. This shows that the meta-composite material prepared in the embodiment of the present invention has good temperature-resistant tensile properties.

[0074] The impact performance test of the meta-composite material obtained in this embodiment shows that the present embodiment exhibits good consistency of mechanical properties under the impact test environment of 6.7 J / mm. Figure 7 It can be seen that the impact damage diffuses gradually and steadily inside the meta-composite material. The average peak impact force that the meta-composite material can finally reach is 7.1 kN, and the average energy dissipation ratio is 40%. This indicates that the meta-composite material prepared in the embodiment of the present invention has good impact resistance.

[0075] The stealth performance of the meta-composite material obtained in this embodiment was tested. Figure 8 Analysis shows that the meta-composite material has achieved good absorption performance in the X-band. The absorption rate of the meta-composite material in the entire X-band is ≥60% (-4dB), and the minimum reflection loss value in the X-band can reach -16.69dB. This shows that the meta-composite material prepared in the embodiment of the present invention has good stealth performance.

[0076] The meta-composite material obtained in this embodiment is subjected to an absorption peak regulation test under magnetic field excitation. Fig. 9 It can be seen that with the increase of magnetic field intensity, the absorption peak of the amorphous silk metacomposite material undergoes an obvious blue shift and can achieve a control range of 3.36 GHz. This shows that the metacomposite material prepared in the embodiment of the present invention can achieve absorption peak control with a larger bandwidth under magnetic field excitation and has better variable characteristic characteristics.

[0077] The meta-composite material obtained in this embodiment is subjected to an absorption peak regulation test under temperature field excitation. Fig.10It can be seen that with the increase of temperature, the absorption peak of the amorphous silk metacomposite material undergoes an obvious red shift and can achieve a control range of 2.02 GHz. This shows that the metacomposite material prepared in the embodiment of the present invention can achieve absorption peak control with a larger bandwidth under temperature field excitation and has good variable characteristic characteristics.

[0078] The amorphous wire array of the meta-composite material of the present invention can couple with the resistive square ring metasurface to effectively lose the incident electromagnetic wave. Due to the effects of the high-temperature epoxy resin and the glass fiber layer, the meta-composite material has good impact and tensile resistance. The mechanical tensile strength at room temperature can reach up to 570MPa, and the average impact peak force can reach 7.1kN, with excellent mechanical properties. In addition, the meta-composite material has good temperature resistance and still has excellent wave absorption performance under high temperature environment. At the same time, the external field sensitive characteristics of the amorphous wire magnetic domain structure give the meta-composite material the ability to change its properties. Under the action of the magnetic field, the absorption peak of the meta-composite material is blue-shifted, and the regulation range can reach 3.36GHz; under the action of the temperature field, the absorption peak of the meta-composite material is red-shifted, and the regulation range can reach 2.02GHz. The preparation method of the structural stealth integrated variable-property meta-composite material proposed by the present invention is simple and structurally controllable, which meets the actual application needs and has good application prospects in rail transportation, aerospace, radar stealth and other aspects.

[0079] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A structural stealth integrated variable property meta-composite material based on amorphous silk, characterized in that: The meta-composite material is a multi-layer structure integrally formed by high-temperature epoxy resin through a vacuum resin transfer molding process; in the multi-layer structure, in order from top to bottom, the first layer is an amorphous wire array layer, the second and third layers are both square ring-shaped meta-surface layers, and the fourth to twentieth layers are all glass fiber cloth layers.

2. The structural stealth integrated variable property meta-composite material based on amorphous silk according to claim 1, characterized in that: The amorphous wire array layer comprises an amorphous wire array and glass fiber cloth. The amorphous wire array is arranged on the bottom surface of the glass fiber cloth by a wire laying method. The amorphous wire array is obtained by arranging glass-coated ferromagnetic amorphous wires in parallel with equal intervals.

3. The structural stealth integrated variable property meta-composite material based on amorphous silk according to claim 2, characterized in that: The spacing between adjacent glass-coated ferromagnetic amorphous wires is 7 mm. The glass-coated ferromagnetic amorphous wire is a ferromagnetic metal core with an outer layer coated with Pyrex high borosilicate glass, and the average resistivity is 2.7×10 -5 Ω / m, the average single-filament tensile strength reaches 920MPa, and the initial crystallization temperature reaches 500℃.

4. The structural stealth integrated variable property meta-composite material based on amorphous silk according to claim 3, characterized in that: The ferromagnetic metal core is prepared by the Taylor-Ulitovsky method, has an outer diameter of 80 μm, an inner diameter of 60 μm, and a composition of Fe 77 Si 10 B 10 C3.

5. The structural stealth integrated variable property meta-composite material based on amorphous silk according to claim 1, characterized in that: The square ring-shaped super surface layer is made by printing the conductive carbon paste on the bottom surface of a single layer of glass fiber cloth according to the square ring-shaped super surface pattern by screen printing technology and drying it.

6. The structural stealth integrated variable property meta-composite material based on amorphous silk according to claim 5, characterized in that: The outer side length of the square ring-shaped super surface pattern is 5 mm, the inner side length is 3 mm, and the structural unit period is 7 mm.

7. The structural stealth integrated variable property meta-composite material based on amorphous silk according to claim 5, characterized in that: The mesh number of the screen printing plate used in the screen printing process is 300 meshes, and the resistance value of the conductive carbon paste is 45Ω / □.

8. The structural stealth integrated variable property meta-composite material based on amorphous silk according to claim 1, characterized in that: The glass fiber cloth layer is glass fiber cloth and has isotropy.

9. A method for preparing a structural stealth integrated variable property meta-composite material based on amorphous wire as claimed in any one of claims 1 to 8, characterized in that: The details are as follows: The amorphous wire array layer is prepared by the wire laying method, and the square ring-shaped supersurface layer is prepared by the screen printing process; in order from top to bottom, the first layer is the amorphous wire array layer, the second and third layers are both square ring-shaped supersurface layers, and the fourth to twentieth layers are all glass fiber cloth layers. After laying them in sequence, the twenty layers of materials are integrated into one by one using high-temperature epoxy resin through a vacuum resin transfer molding process to obtain a structural stealth integrated variable property meta-composite material based on amorphous wire.

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