CN109720027B - High-temperature-resistant structural wave-absorbing material based on metal coating and preparation method thereof - Google Patents
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Abstract
本发明公开了一种基于金属涂层的耐高温结构吸波材料及其制备方法。耐高温结构吸波材料由耐高温纤维布包覆结构吸波体构成；结构吸波体由一组结构吸波体单元构成或由两组以上结构吸波体单元叠加构成；结构吸波体单元包括介质基底层及其表面的阻抗层。其制备方法是采用磁控溅射工艺将耐高温金属材料溅射至耐高温纤维布表面，得到阻抗层；将阻抗层覆盖至介质基底层表面，得到一组结构吸波体单元；采用耐高温纤维布一组结构吸波体单元或者多组层叠的结构吸波体单元并缝合，即得可以耐受至少700℃以上的高温，具有较好的耐高温性和抗氧化性，并具有较宽的吸波带宽的耐高温结构吸波材料。The invention discloses a metal coating-based high-temperature-resistant structural wave-absorbing material and a preparation method thereof. High temperature resistant structural absorbing material is composed of high temperature resistant fiber cloth covered structural absorbing body; structural absorbing body is composed of a group of structural absorbing body units or composed of two or more structural absorbing body units; structural absorbing body unit Including the dielectric base layer and the resistance layer on its surface. The preparation method is to sputter high-temperature-resistant metal materials onto the surface of high-temperature-resistant fiber cloth by magnetron sputtering technology to obtain an impedance layer; cover the impedance layer to the surface of the dielectric base layer to obtain a group of structural absorber units; adopt high-temperature-resistant A group of structural absorber units of fiber cloth or multiple sets of laminated structural absorber units are stitched together, which can withstand a high temperature of at least 700°C, have good high temperature resistance and oxidation resistance, and have a wide High temperature resistant structure absorbing material with wide absorbing bandwidth.
Description
技术领域technical field
本发明涉及一种吸波材料，特别涉及一种耐高温耐、抗氧化，并具有较宽的吸波带宽的吸波材料，还涉及其制备方法，属于吸波材料技术领域。The invention relates to a wave-absorbing material, in particular to a wave-absorbing material with high temperature resistance, oxidation resistance, and a wide wave-absorbing bandwidth, and a preparation method thereof, which belongs to the technical field of wave-absorbing materials.
背景技术Background technique
随着现代军事技术的发展，隐身技术被应用于各种复杂环境。例如战斗机、巡航导弹等空中武器装备的尾喷管、鼻锥帽、机翼前沿等部件工作温度可达到700℃甚至1000℃以上，对雷达波反射较强，已成为影响新型武器装备隐身性能的重要因素。由于绝大多数磁性材料的居里温度都低于700℃，其在高温部件的工作温度下失去吸波效果。所以，高温吸波材料大多都是电损耗型吸波材料，与常温应用的磁性吸波材料相比，高温吸波材料的吸收频带较窄，低频吸波效果较差。如何提高高温吸波材料的吸波性能，是高温隐身材料研究一直探索的内容之一。With the development of modern military technology, stealth technology has been applied in various complex environments. For example, the exhaust nozzles, nose cone caps, wing fronts and other components of air weapons such as fighter jets and cruise missiles can operate at temperatures above 700°C or even 1000°C. Key factor. Since the Curie temperature of most magnetic materials is lower than 700°C, it loses its absorbing effect at the operating temperature of high-temperature components. Therefore, most high-temperature absorbing materials are electric loss absorbing materials. Compared with magnetic absorbing materials used at room temperature, high-temperature absorbing materials have narrower absorption frequency bands and poorer low-frequency absorbing effects. How to improve the microwave-absorbing performance of high-temperature microwave-absorbing materials is one of the contents that have been explored in the research of high-temperature stealth materials.
国内外有关高温隐身的材料研究主要包括碳材料、碳化硅及金属氧化物等，改性方式主要是通过包覆改性提高材料的耐高温性能和通过掺杂改性提高损耗。专利CN105861977A、CN108821778A、CN103880426A分别公布了耐高温吸波材料，公开的几种吸波材料具有较好的耐高温性能，但低于-10dB的吸波频带较窄。由于耐高温吸波材料通常以陶瓷材料或金属氧化物作为基体，介电常数较高，必然导致有效带宽偏窄，难以满足应用要求，可以通过结构隐身设计拓展吸波带宽。Research on high-temperature stealth materials at home and abroad mainly includes carbon materials, silicon carbide, and metal oxides. The modification methods are mainly to improve the high-temperature resistance of materials through coating modification and to increase loss through doping modification. Patents CN105861977A, CN108821778A, and CN103880426A respectively disclose high-temperature-resistant absorbing materials. The disclosed absorbing materials have good high-temperature resistance, but the absorbing frequency band below -10dB is narrow. Since high-temperature absorbing materials usually use ceramic materials or metal oxides as the matrix, the dielectric constant is high, which will inevitably lead to a narrow effective bandwidth, which is difficult to meet the application requirements. The absorbing bandwidth can be expanded through structural stealth design.
结构隐身是利用人工构造的实际结构或电路来实现对入射电磁波的匹配和吸收，它以宽频内电磁参数不敏感的介质材料为基体，将电阻薄膜、电路元件或频率选择表面构成的周期性电路结构布置在基体表面，形成单层或多层的层板型吸波结构。专利US2599944A、CN108749229A、CN108819384A中分别公布了几种多层结构吸波材料，在常温下具有良好的吸波性能和较宽的吸收频带。Structural stealth is the use of artificially constructed actual structures or circuits to achieve matching and absorption of incident electromagnetic waves. It uses dielectric materials that are not sensitive to electromagnetic parameters in broadband as the substrate, and consists of resistive films, circuit components or frequency selective surfaces. Periodic circuit The structure is arranged on the surface of the substrate to form a single-layer or multi-layer laminate type absorbing structure. Patents US2599944A, CN108749229A, and CN108819384A respectively disclose several multilayer structure absorbing materials, which have good absorbing properties and a wide absorbing frequency band at room temperature.
专利CN107039778A、CN107141021A、CN106042515A、CN106007804A分别公布了几种耐高温结构吸波材料，采用金属氧化物陶瓷和导电玻璃等材料，制备了基于频率选择表面的吸波结构，具有较好的耐高温性能和宽频吸波性能，但其吸波性能随温度上升变化较大。Patents CN107039778A, CN107141021A, CN106042515A, and CN106007804A respectively announced several high-temperature-resistant structure absorbing materials, using materials such as metal oxide ceramics and conductive glass to prepare a wave-absorbing structure based on a frequency-selective surface, which has good high-temperature resistance and Broadband absorbing performance, but its absorbing performance changes greatly with temperature rise.
发明内容Contents of the invention
针对以上背景技术中耐高温吸波材料存的不足和缺陷，本发明的目的是在于提供一种可以耐受至少700℃以上的高温，具有较好的耐高温性和抗氧化性，并具有较宽的吸波带宽的耐高温结构吸波材料。In view of the deficiencies and defects of high-temperature-resistant wave-absorbing materials in the above background technology, the purpose of the present invention is to provide a high-temperature-resistant material that can withstand at least 700°C, has better high-temperature resistance and oxidation resistance, and has a higher High temperature resistant structure absorbing material with wide absorbing bandwidth.
本发明的另一个目的是在于提供一种简单、低成本的制备耐高温结构吸波材料的方法。Another object of the present invention is to provide a simple and low-cost method for preparing high-temperature-resistant structural wave-absorbing materials.
为了实现上述技术目的，本发明提供了一种基于金属涂层的耐高温结构吸波材料，其由耐高温纤维布包覆结构吸波体构成；所述结构吸波体由一组结构吸波体单元构成，或者由两组以上结构吸波体单元叠加构成；所述结构吸波体单元包括介质基底层及其表面的阻抗层，所述介质基底层为氧化物纤维增强氧化物气凝胶复合材料，所述阻抗层为包含耐高温金属材料涂层的耐高温纤维布。In order to achieve the above-mentioned technical purpose, the present invention provides a high-temperature-resistant structural absorber based on metal coating, which is composed of a high-temperature-resistant fiber cloth-wrapped structural absorber; the structural absorber consists of a group of structural absorbers body unit, or composed of two or more groups of structural absorber units superimposed; the structural absorber unit includes a dielectric base layer and an impedance layer on its surface, and the dielectric base layer is an oxide fiber reinforced oxide aerogel A composite material, the resistance layer is a high temperature resistant fiber cloth coated with a high temperature resistant metal material.
优选的方案，所述介质基底层厚度为5～10mm。In a preferred solution, the thickness of the dielectric base layer is 5-10 mm.
优选的方案，所述耐高温金属材料涂层厚度为10～100nm。In a preferred solution, the thickness of the high temperature-resistant metal material coating is 10-100 nm.
优选的方案，结构吸波体由1～3组结构吸波体单元叠加构成。In a preferred solution, the structural absorber is composed of 1 to 3 sets of structural absorber units superimposed.
优选的方案，所述氧化物纤维增强氧化物气凝胶复合材料包括石英纤维毡增强氧化硅气凝胶复合材料或连续莫来石纤维增强氧化硅气凝胶复合材料。本发明选取的这几种氧化物纤维增强氧化物气凝胶复合材料不仅能够保证吸波材料产品的吸波性能和耐高温性能，还能保证吸波材料具有较低的面密度和热导率。In a preferred solution, the oxide fiber-reinforced oxide-airgel composite material includes quartz fiber felt-reinforced silica-airgel composite material or continuous mullite fiber-reinforced silica-airgel composite material. These kinds of oxide fiber reinforced oxide airgel composite materials selected in the present invention can not only ensure the wave-absorbing performance and high temperature resistance of wave-absorbing material products, but also ensure that the wave-absorbing material has a lower surface density and thermal conductivity .
优选的方案，所述包含耐高温金属材料涂层的耐高温纤维布表面的耐高温金属材料涂层为均匀连续薄膜或频率选择表面。In a preferred solution, the high-temperature-resistant metal material coating on the surface of the high-temperature-resistant fiber cloth containing the high-temperature-resistant metal material coating is a uniform continuous film or a frequency-selective surface.
较优选的方案，所述频率选择表面为方形贴片构成的周期性阵列或方孔网格构成的周期性阵列，如图3及图4所示。In a more preferred solution, the frequency selective surface is a periodic array of square patches or a periodic array of square hole grids, as shown in FIG. 3 and FIG. 4 .
较优选的方案，所述耐高温金属材料涂层的温度系数范围为0～50ppm/℃。In a more preferred solution, the temperature coefficient of the high temperature-resistant metal coating is in the range of 0-50 ppm/°C.
较优选的方案，所述耐高温金属材料包括镍铬合金、镍铬铁合金、镍铬铝合金、铬铝钕合金、铬铁铝合金或铬铁铝锰合金。本发明选取的这几种耐高温金属材料不仅具有较高的工作温度，同时具有较低的电阻率温度系数，其电性能随温度变化较小，在较高温度下仍能保持原有的吸波性能。More preferably, the high-temperature-resistant metal material includes nickel-chromium alloy, nickel-chromium-iron alloy, nickel-chromium-aluminum alloy, chrome-aluminum-neodymium alloy, chrome-iron-aluminum alloy or chrome-iron-aluminum-manganese alloy. These high-temperature-resistant metal materials selected in the present invention not only have a higher working temperature, but also have a lower temperature coefficient of resistivity. wave performance.
优选的方案，所述耐高温纤维布包括石英纤维布、碳化硅纤维布或氮化硼纤维布。In a preferred solution, the high temperature resistant fiber cloth includes quartz fiber cloth, silicon carbide fiber cloth or boron nitride fiber cloth.
本发明还提供了一种基于金属涂层的耐高温结构吸波材料的制备方法，其包括以下步骤：The present invention also provides a method for preparing a metal-coated high-temperature-resistant structural wave-absorbing material, which includes the following steps:
1)制备介质基底层；1) preparing a medium base layer;
2)采用磁控溅射工艺将耐高温金属材料溅射至耐高温纤维布表面，得到阻抗层；2) Using the magnetron sputtering process to sputter the high-temperature-resistant metal material onto the surface of the high-temperature-resistant fiber cloth to obtain an impedance layer;
3)将阻抗层覆盖至介质基底层表面，得到一组结构吸波体单元；3) covering the impedance layer to the surface of the dielectric base layer to obtain a group of structural absorber units;
4)将两组以上结构吸波体单元由下至上层叠，得到多组结构吸波体单元；4) Stack more than two sets of structural absorber units from bottom to top to obtain multiple sets of structural absorber units;
5)采用耐高温纤维布一组结构吸波体单元或者多组结构吸波体单元并缝合，即得。5) A set of structural absorber units or multiple sets of structural absorber units of high temperature resistant fiber cloth are used and stitched together to obtain the finished product.
优选的方案，所述磁控溅射工艺条件：磁控溅射源为直流源，溅射电压为1～10V，溅射时间为0.5～10min，溅射气氛为氮气或氩气，背景真空度不大于5×10-4Pa。The preferred solution, the magnetron sputtering process conditions: the magnetron sputtering source is a DC source, the sputtering voltage is 1-10V, the sputtering time is 0.5-10min, the sputtering atmosphere is nitrogen or argon, and the background vacuum is Not more than 5×10 -4 Pa.
与现有技术相比，本发明技术方案的优点在于：Compared with the prior art, the advantages of the technical solution of the present invention are:
(1)本发明的耐高温结构吸波材料的各个组成部分采用了耐高温抗氧化的陶瓷或合金材料，均可以耐受至少700℃以上的高温，因此整体具有较好的耐高温性和优异的抗氧化性。(1) Each component of the high-temperature-resistant structural wave-absorbing material of the present invention adopts high-temperature-resistant and anti-oxidation ceramics or alloy materials, which can withstand high temperatures of at least 700°C, so the whole has good high-temperature resistance and excellent antioxidant properties.
(2)本发明的耐高温结构吸波材料采用的是低密度的气凝胶材料，整体面密度较小，减轻了产品的重量，满足了部件的轻量化需求，且介电常数较低，相比块体陶瓷材料更容易实现宽频吸波。(2) The high-temperature-resistant structural wave-absorbing material of the present invention adopts a low-density airgel material, which has a small overall surface density, reduces the weight of the product, meets the lightweight requirements of components, and has a low dielectric constant. Compared with bulk ceramic materials, it is easier to achieve broadband microwave absorption.
(3)本发明的耐高温结构吸波材料层向热导率较低，因而具有较好的隔热性能，从而可以实现隐身、隔热、防热等多重功能的一体化。(3) The layer-wise thermal conductivity of the high-temperature-resistant structural wave-absorbing material of the present invention is low, so it has good heat insulation performance, so that the integration of multiple functions such as stealth, heat insulation, and heat protection can be realized.
(4)本发明的耐高温结构吸波材料采用了低电阻温度系数的金属材料制备阻抗层，阻抗层性能受温度影响较小，故吸波性能不易随温度上升而变化。(4) The high-temperature-resistant structural wave-absorbing material of the present invention adopts a metal material with a low temperature coefficient of resistance to prepare the resistance layer, and the performance of the resistance layer is less affected by temperature, so the wave-absorbing performance is not easy to change with temperature rise.
(5)本发明的耐高温结构吸波材料采用了磁控溅射制备金属薄膜，可以通过溅射条件控制薄膜厚度，实现精确的阻抗匹配设计。(5) The high-temperature-resistant structural wave-absorbing material of the present invention adopts magnetron sputtering to prepare metal thin films, and the film thickness can be controlled by sputtering conditions to achieve precise impedance matching design.
附图说明Description of drawings
图1为由两组结构吸波体单元构成的结构吸波体；Figure 1 is a structural absorber composed of two sets of structural absorber units;
图2为实施例1的耐高温结构吸波材料的雷达反射率曲线；Fig. 2 is the radar reflectivity curve of the high temperature resistant structural wave-absorbing material of embodiment 1;
图3方孔网格构成的周期性阵列；The periodic array that Fig. 3 square hole grid forms;
图4为方形贴片构成的周期性阵列。Figure 4 is a periodic array of square patches.
具体实施方式Detailed ways
以下实施例旨在进一步说明本发明内容，而不是限制权利要求的保护范围。The following examples are intended to further illustrate the content of the present invention, but not to limit the protection scope of the claims.
实施例1Example 1
一种本发明的基于金属涂层的耐高温结构吸波材料，如图1所示，由两组结构吸波体构成，所述结构吸波体由下至上包括一个介质基底层和一个阻抗层，所述介质基底层为石英纤维增强氧化硅气凝胶复合材料，所述阻抗层为镍铬合金涂敷的石英纤维布。其制备方法包括以下步骤：A metal-coated high-temperature-resistant structural wave-absorbing material of the present invention, as shown in Figure 1, is composed of two sets of structural wave-absorbing bodies, and the structural wave-absorbing body includes a dielectric base layer and an impedance layer from bottom to top , the dielectric base layer is quartz fiber reinforced silica airgel composite material, and the resistance layer is nickel-chromium alloy coated quartz fiber cloth. Its preparation method comprises the following steps:
(1)制备介质基底：按照设计要求选取石英纤维增强氧化硅气凝胶复合材料，采用溶胶-凝胶工艺制备石英纤维增强氧化硅气凝胶复合材料，最后，采用机械加工的方法，将复合材料加工至7.5mm，制成7.5mm厚的介质基底层1和介质基底层2；(1) Preparation of medium substrate: select quartz fiber reinforced silica airgel composite material according to the design requirements, prepare quartz fiber reinforced silica airgel composite material by sol-gel process, and finally, use mechanical processing method to make the composite The material is processed to 7.5mm to make 7.5mm thick dielectric base layer 1 and dielectric base layer 2;
(2)制备阻抗层：采用磁控溅射工艺，将用于制备阻抗层的镍铬合金溅射在石英纤维布表面形成均匀连续薄膜，分别制备阻抗层1和阻抗层2，磁控溅射源为直流源，溅射电压为1V，溅射气氛为氮气，背景真空度为5×10-4Pa，溅射0.5min得到阻抗层1，溅射1min得到阻抗层2。(2) Preparation of impedance layer: Using the magnetron sputtering process, the nickel-chromium alloy used to prepare the impedance layer is sputtered on the surface of the quartz fiber cloth to form a uniform and continuous film, and the impedance layer 1 and the impedance layer 2 are prepared respectively. Magnetron sputtering The source is a DC source, the sputtering voltage is 1V, the sputtering atmosphere is nitrogen, the background vacuum is 5×10 -4 Pa, sputtering for 0.5 min to obtain resistive layer 1, and sputtering for 1 min to obtain resistive layer 2.
(3)将步骤(2)制备的阻抗层1覆盖于介质基底层1表面，得到结构吸波体1；将步骤(2)制备的阻抗层2覆盖于介质基底层2表面，得到结构吸波体2；(3) Cover the impedance layer 1 prepared in step (2) on the surface of the dielectric base layer 1 to obtain a structural absorber 1; cover the impedance layer 2 prepared in step (2) on the surface of the dielectric base layer 2 to obtain a structural absorber body 2;
(4)将步骤(3)制备的结构吸波体1和结构吸波体2由下至上层叠，得到双层吸波结构；(4) The structural absorber 1 and the structural absorber 2 prepared in step (3) are stacked from bottom to top to obtain a double-layer absorber structure;
(5)采用石英纤维布包覆步骤(4)所述多层吸波结构并缝合，完成耐高温结构吸波材料的制备。(5) The multi-layer absorbing structure described in step (4) is covered with quartz fiber cloth and stitched to complete the preparation of the high-temperature-resistant structural absorbing material.
测试本实例耐高温结构吸波材料的雷达反射率曲线如图2所示，其反射率在室温下，在4.5～15GHz范围内均小于-10dB。The radar reflectivity curve of the high-temperature-resistant structural wave-absorbing material tested in this example is shown in Figure 2, and its reflectivity is less than -10dB in the range of 4.5-15GHz at room temperature.
实施例2Example 2
一种本发明的基于金属涂层的耐高温结构吸波材料，由一组结构吸波体构成，所述结构吸波体由下至上包括一个介质基底层和一个阻抗层，所述介质基底层为连续莫来石纤维增强氧化硅气凝胶复合材料，所述阻抗层为镍铬铁合金涂敷的氮化硼纤维布。其制备方法包括以下步骤：A metal coating-based high-temperature-resistant structural wave-absorbing material of the present invention is composed of a group of structural wave-absorbing bodies, and the structural wave-absorbing body includes a dielectric base layer and an impedance layer from bottom to top, and the dielectric base layer It is a continuous mullite fiber reinforced silicon oxide airgel composite material, and the resistance layer is a boron nitride fiber cloth coated with nickel-chromium-iron alloy. Its preparation method comprises the following steps:
(1)制备介质基底：按照设计要求选取石英纤维增强氧化硅气凝胶复合材料，采用溶胶-凝胶工艺制备连续莫来石纤维增强氧化硅气凝胶复合材料，最后，采用机械加工的方法，将复合材料加工至7.5mm，制成7.5mm厚的介质基底层；(1) Preparation of medium substrate: Select quartz fiber-reinforced silica airgel composite material according to the design requirements, and prepare continuous mullite fiber-reinforced silica airgel composite material by sol-gel process, and finally, adopt mechanical processing method , process the composite material to 7.5mm to make a 7.5mm thick dielectric base layer;
(2)制备阻抗层：采用磁控溅射工艺，将用于制备阻抗层的镍铬铁合金溅射在氮化硼纤维布表面形成均匀连续薄膜，磁控溅射源为直流源，溅射电压为3V，溅射气氛为氩气，背景真空度为1×10-4Pa，溅射时间为1min。(2) Preparation of impedance layer: The magnetron sputtering process is used to sputter the nickel-chromium-iron alloy used to prepare the impedance layer on the surface of boron nitride fiber cloth to form a uniform and continuous film. The magnetron sputtering source is a DC source, and the sputtering voltage is The sputtering atmosphere is argon, the background vacuum is 1×10 -4 Pa, and the sputtering time is 1 min.
(3)将步骤(2)制备的阻抗层覆盖于介质基底层表面，得到一组结构吸波体；(3) covering the impedance layer prepared in step (2) on the surface of the dielectric base layer to obtain a group of structural absorbers;
(4)采用石英纤维布包覆步骤(3)所述的一组结构吸波体并封装，完成耐高温结构吸波材料的制备。(4) The group of structural absorbers described in step (3) is covered with quartz fiber cloth and packaged to complete the preparation of the high temperature resistant structural absorber.
测试本实例耐高温结构吸波材料的雷达反射率，其反射率在室温下，在8～12GHz范围内均小于-10dB，10GHz频点处得到小于-30dB的吸收峰。Test the radar reflectivity of the high-temperature-resistant structural wave-absorbing material in this example. The reflectivity is less than -10dB in the range of 8-12GHz at room temperature, and the absorption peak of less than -30dB is obtained at the frequency point of 10GHz.
实施例3Example 3
一种本发明的基于金属涂层的耐高温结构吸波材料，如图1所示，由两组结构吸波体构成，所述结构吸波体由下至上包括一个介质基底层和一个阻抗层，所述介质基底层为石英纤维增强氧化硅气凝胶复合材料，所述阻抗层为镍铬钕合金涂敷的碳化硅纤维布。其制备方法包括以下步骤：A metal-coated high-temperature-resistant structural wave-absorbing material of the present invention, as shown in Figure 1, is composed of two sets of structural wave-absorbing bodies, and the structural wave-absorbing body includes a dielectric base layer and an impedance layer from bottom to top , the dielectric base layer is quartz fiber reinforced silica airgel composite material, and the resistance layer is silicon carbide fiber cloth coated with nickel-chromium-neodymium alloy. Its preparation method comprises the following steps:
(1)制备介质基底：按照设计要求选取石英纤维增强氧化硅气凝胶复合材料，采用溶胶-凝胶工艺制备石英纤维增强氧化硅气凝胶复合材料，最后，采用机械加工的方法，将复合材料加工至5mm，制成5mm厚的介质基底层1和介质基底层2；(1) Preparation of medium substrate: select quartz fiber reinforced silica airgel composite material according to the design requirements, prepare quartz fiber reinforced silica airgel composite material by sol-gel process, and finally, use mechanical processing method to make the composite The material is processed to 5mm to make a dielectric base layer 1 and a dielectric base layer 2 with a thickness of 5 mm;
(2)制备阻抗层：首先将石英纤维布裁剪成图3所示网格阵列，其中方孔尺寸为1mm×1mm，网格线宽为1mm；然后采用磁控溅射工艺，将用于制备阻抗层的镍铬钕合金溅射在碳化硅纤维布表面形成频率选择表面(如图3)，分别制备阻抗层1和阻抗层2，磁控溅射源为直流源，溅射电压为3V，溅射气氛为氩气，背景真空度为1×10-4Pa，溅射1min得到阻抗层1，溅射2.5min得到阻抗层2。(2) Preparation of impedance layer: First, cut the quartz fiber cloth into a grid array as shown in Figure 3, in which the square hole size is 1mm×1mm, and the grid line width is 1mm; then, the magnetron sputtering process will be used to prepare The nickel-chromium-neodymium alloy of the impedance layer is sputtered on the surface of the silicon carbide fiber cloth to form a frequency selective surface (as shown in Figure 3), and the impedance layer 1 and the impedance layer 2 are prepared respectively. The magnetron sputtering source is a DC source, and the sputtering voltage is 3V. The sputtering atmosphere is argon, the background vacuum is 1×10 -4 Pa, the resistive layer 1 is obtained by sputtering for 1 min, and the resistive layer 2 is obtained by sputtering for 2.5 min.
(3)将步骤(2)制备的阻抗层1覆盖于介质基底层1表面，得到结构吸波体1；将步骤(2)制备的阻抗层2覆盖于介质基底层2表面，得到结构吸波体2；(3) Cover the impedance layer 1 prepared in step (2) on the surface of the dielectric base layer 1 to obtain a structural absorber 1; cover the impedance layer 2 prepared in step (2) on the surface of the dielectric base layer 2 to obtain a structural absorber body 2;
(4)将步骤(3)制备的结构吸波体1和结构吸波体2由下至上层叠，得到双层吸波结构；(4) The structural absorber 1 and the structural absorber 2 prepared in step (3) are stacked from bottom to top to obtain a double-layer absorber structure;
(5)采用石英纤维布包覆步骤(4)所述多层吸波结构并缝合，完成耐高温结构吸波材料的制备。(5) The multi-layer absorbing structure described in step (4) is covered with quartz fiber cloth and stitched to complete the preparation of the high-temperature-resistant structural absorbing material.
测试本实例耐高温结构吸波材料的雷达反射率，其反射率在室温下，在6～18GHz范围内均小于-10dB。Test the radar reflectivity of the high-temperature-resistant structural wave-absorbing material in this example, and its reflectivity is less than -10dB in the range of 6-18GHz at room temperature.
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