CN114531837B - A kind of wave-absorbing material with composite structure and its preparation method - Google Patents
A kind of wave-absorbing material with composite structure and its preparation method Download PDFInfo
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Abstract
Description
技术领域technical field
本发明属于吸波材料领域，具体涉及一种具有复合结构的吸波材料及其制备方法。The invention belongs to the field of wave-absorbing materials, and in particular relates to a wave-absorbing material with a composite structure and a preparation method thereof.
背景技术Background technique
众所周知，吸波材料可以将电磁波能量转化为其他形式的能量或者通过电磁波的干涉相消作用，进而达到解决电磁污染和飞行器隐身问题。近年来，吸波材料在军事“隐身”技术、改善电磁兼容性能、防止电磁辐射、防止信息泄露等领域发挥了重要作用。对于一种吸波材料而言，材料质量、阻抗匹配、磁损耗能力、可吸收电磁波的频段范围等都是衡量吸波材料性能优劣的关键因素。As we all know, absorbing materials can convert electromagnetic wave energy into other forms of energy or through the interference and destructive effect of electromagnetic waves, so as to solve the problems of electromagnetic pollution and aircraft stealth. In recent years, absorbing materials have played an important role in military "stealth" technology, improving electromagnetic compatibility performance, preventing electromagnetic radiation, and preventing information leakage. For a wave-absorbing material, material quality, impedance matching, magnetic loss capability, and frequency range that can absorb electromagnetic waves are all key factors to measure the performance of the wave-absorbing material.
吸波材料通过自身的损耗机制将入射电磁波的电磁能转换成热能而耗散掉，或使入射电磁波因干涉而回波减小，将电磁能量分散到其他方向上。The absorbing material converts the electromagnetic energy of the incident electromagnetic wave into thermal energy through its own loss mechanism and dissipates it, or reduces the echo of the incident electromagnetic wave due to interference, and disperses the electromagnetic energy to other directions.
磁性吸波材料是目前研究和应用得最多的一类。一般而言，磁性吸波材料由于其高温稳定性、易加工性以及宽频高效性在当前的军民国防领域具有重要的战略地位。如何将不同的磁性材料通过有效的排列、进而达到扩宽吸波频带以及增强吸波特性一直是该领域的研究热点。Magnetic absorbing materials are the most researched and applied category at present. Generally speaking, magnetic absorbing materials have an important strategic position in the current military and civilian defense fields due to their high temperature stability, ease of processing, and broadband efficiency. How to effectively arrange different magnetic materials to broaden the absorbing frequency band and enhance absorbing properties has always been a research hotspot in this field.
申请号为200810075570.1的中国发明专利公开了一种多层雷达吸波涂料及其制备方法，吸波涂层包含交替叠合的介电损耗复合涂料层和磁性损耗复合涂料层。其中，介电损耗涂料主要包括四针状氧化锌晶须、导电炭黑；磁性损耗复合涂料主要包括四氧化三铁和纳米铁粉；用喷涂或刷涂法施工到铝质平板材料上，从底层至面层喷涂顺序为：磁性层-介电层-磁性-介电层，最终其在4～8GHz波段的反射率达-4～-6dB；在8～18GHz波段的反射率达到-5～-8dB。The Chinese invention patent with application number 200810075570.1 discloses a multi-layer radar absorbing coating and its preparation method. The absorbing coating includes alternately stacked dielectric loss composite coating layers and magnetic loss composite coating layers. Among them, the dielectric loss coating mainly includes four-needle zinc oxide whiskers and conductive carbon black; the magnetic loss composite coating mainly includes ferric oxide and nano-iron powder; it is applied to aluminum flat materials by spraying or brushing, from The spraying sequence from the bottom layer to the surface layer is: magnetic layer-dielectric layer-magnetic-dielectric layer, and finally its reflectivity in the 4~8GHz band reaches -4~-6dB; in the 8~18GHz band the reflectivity reaches -5~ -8dB.
申请号为201910428518.8的中国发明专利文献公开了一种多层结构的耐高温雷达吸波材料，所述多层结构的耐高温雷达吸波材料由内至外依次包括内介质层、耐高温介电涂层和外介质层，其中，所述耐高温介电涂层为Al掺杂Ti3SiC2陶瓷介电涂层；所述介质层为超细玻璃纤维增强氧化物基复合材料。其在8.2～12.4GHz频率范围内大大改善材料的微波损耗性能。The Chinese invention patent document with the application number 201910428518.8 discloses a multi-layer structure high-temperature resistant radar absorbing material. The multi-layer structure high-temperature resistant radar absorbing material includes an inner dielectric layer, a high-temperature resistant dielectric A coating and an outer dielectric layer, wherein the high-temperature-resistant dielectric coating is an Al-doped Ti 3 SiC 2 ceramic dielectric coating; the dielectric layer is an ultrafine glass fiber-reinforced oxide-based composite material. It greatly improves the microwave loss performance of the material in the frequency range of 8.2-12.4GHz.
综上可以看到，已公开技术中对宽频吸波材料的研究中，其吸波频段和效果始终不尽人意，还达不到要求。为了实现宽频吸波材料的高效能和薄层化，本领域急需开发一种新型的兼具优良磁电特性和宽频微波吸收特性的复合吸波材料。In summary, it can be seen that in the research on broadband absorbing materials in the disclosed technology, its absorbing frequency band and effect are always unsatisfactory and can not meet the requirements. In order to achieve high efficiency and thin layers of broadband absorbing materials, it is urgent to develop a new type of composite absorbing materials with excellent magnetoelectric properties and broadband microwave absorption properties.
发明内容Contents of the invention
本发明提供了一种具有复合结构的吸波材料，该吸波材料具有较高的宽频吸波性能和磁电特性。The invention provides a wave-absorbing material with a composite structure, and the wave-absorbing material has high broadband wave-absorbing performance and magnetoelectric properties.
一种具有复合结构的吸波材料包括吸附在基体上的高频稀土软磁层，形成于所述高频稀土软磁层上的FeSiAl层，以及形成于所述FeSiAl层上的羰基铁层，所述高频稀土软磁层、FeSiAl层以及羰基铁层三者在所述吸波材料的质量占比分别呈梯度变化。A wave-absorbing material with a composite structure includes a high-frequency rare-earth soft magnetic layer adsorbed on a substrate, a FeSiAl layer formed on the high-frequency rare-earth soft magnetic layer, and a carbonyl iron layer formed on the FeSiAl layer, The mass proportions of the high-frequency rare earth soft magnetic layer, the FeSiAl layer and the carbonyl iron layer in the wave-absorbing material respectively change in gradients.
考虑到羰基铁、FeSiAl层、高频稀土软磁在微波频段的磁电特性的互补性(介电常数依次增大、磁导率依次增大以及微波损耗能力的作用频点逐步提升)，本发明通过高频稀土软磁层、FeSiAl层、羰基铁层三者的电磁耦合与协同作用，优化了该复合吸波材料层与层间之间的阻抗，拓宽了材料的宽频频带覆盖能力，最终提升了材料的宽频吸波特性。Considering the complementarity of the magnetoelectric characteristics of carbonyl iron, FeSiAl layer, and high-frequency rare earth soft magnetism in the microwave frequency band (the dielectric constant increases sequentially, the magnetic permeability increases sequentially, and the frequency point of the microwave loss capability gradually increases), this paper Through the electromagnetic coupling and synergistic effect of the high-frequency rare earth soft magnetic layer, FeSiAl layer, and carbonyl iron layer, the impedance between the layers of the composite absorbing material is optimized, and the broadband coverage of the material is broadened. The broadband absorbing characteristics of the material are improved.
所述高频稀土软磁层、FeSiAl层以及羧基铁层在所述吸波材料的质量占比分别为60-80:20-15:10-5。这个占比主要从以下两点考虑：(1)提升金属基底与复合涂层的结合力，由于稀土软磁呈现片层，适合作为金属基底的接触层；然而，过高的稀土软磁层厚度会导致金属基底与涂层结合力下降，不利于严苛环境下的多次重复使用；(2)考虑到高频稀土软磁层的强吸收与高磁导率特性，相对高厚度的稀土软磁层利于降低总体涂层厚度，达到薄层强吸收的目的。The mass proportions of the high frequency rare earth soft magnetic layer, FeSiAl layer and carboxyl iron layer in the absorbing material are 60-80:20-15:10-5, respectively. This proportion is mainly considered from the following two points: (1) To improve the bonding force between the metal substrate and the composite coating, because the rare earth soft magnetic layer presents a sheet layer, which is suitable as the contact layer of the metal substrate; however, the excessive thickness of the rare earth soft magnetic layer It will lead to a decrease in the bonding force between the metal substrate and the coating, which is not conducive to repeated use in harsh environments; (2) Considering the strong absorption and high permeability characteristics of the high-frequency rare earth soft magnetic layer, the relatively high-thickness rare earth soft magnetic layer The magnetic layer is beneficial to reduce the overall coating thickness and achieve the purpose of strong absorption of the thin layer.
所述具有复合结构的吸波材料的厚度为0.8～3.0mm。The thickness of the wave-absorbing material with composite structure is 0.8-3.0 mm.
所述高频稀土软磁层、FeSiAl层以及羧基铁层的厚度分别为0.5-1.5:0.2-0.7:0.1-0.8mm。The thicknesses of the high frequency rare earth soft magnetic layer, the FeSiAl layer and the carboxyl iron layer are 0.5-1.5:0.2-0.7:0.1-0.8mm respectively.
所述高频稀土软磁的化学式为AaCobFec，其中，A为Y、Pr、Nd、Er、Gd、Tb、Dy、Ho稀土元素中的一种，且AaCob中A的原子数a含量为30-35％，Co的原子数b为25-35％，Fe的原子数c含量为30-45％。The chemical formula of the high frequency rare earth soft magnetism is A a Co b Fe c , wherein A is one of Y, Pr, Nd, Er, Gd, Tb, Dy, Ho rare earth elements, and A in A a Co b The atomic number a content of Co is 30-35%, the atomic number b of Co is 25-35%, and the atomic number c content of Fe is 30-45%.
高频稀土软磁层的强吸收与高磁导率特性使其成为宽频拓展的关键，层与层之间的结合作用是3D打印中使用的环氧树脂结合力，层与层之间存在薄层环氧树脂，高温下的固化呈现一定结合力，满足使用要求The strong absorption and high permeability characteristics of the high-frequency rare earth soft magnetic layer make it the key to broadband expansion. The bonding between layers is the bonding force of epoxy resin used in 3D printing. There is a thin layer between layers. One layer of epoxy resin, curing at high temperature shows a certain bonding force, which meets the requirements of use
所述具有复合结构的吸波材料的宽频吸波性能为最大反射率为-30～-45dB，有效频带覆盖宽度4-6.5GHzThe broadband wave-absorbing performance of the wave-absorbing material with composite structure is that the maximum reflectivity is -30～-45dB, and the effective frequency band coverage width is 4-6.5GHz
本发明还公开了一种具有复合结构的吸波材料的制备方法，包括:The invention also discloses a preparation method of a wave-absorbing material with a composite structure, comprising:
(1)将所述高频稀土软磁、溶剂、3D打印液混合得到混合溶液A，将所述FeSiAl、所述溶剂、所述3D打印液混合得到混合溶液B，将所述羰基铁粉、所述溶剂、所述3D打印液混合得到混合溶液C；(1) Mix the high-frequency rare earth soft magnet, solvent, and 3D printing liquid to obtain a mixed solution A, mix the FeSiAl, the solvent, and the 3D printing liquid to obtain a mixed solution B, and mix the carbonyl iron powder, The solvent and the 3D printing solution are mixed to obtain a mixed solution C;
(2)通过3D打印技术，将所述混合溶液A打印到基体表面形成高频稀土软磁层，将混合溶液B打印到所述高频稀土软磁层表面得到高频稀土软磁层/FeSiAl层，将混合溶液C打印到所述FeSiAl层表面得到高频稀土软磁层/FeSiAl层/羰基铁层，经固化后得到具有复合结构的吸波材料。(2) By 3D printing technology, the mixed solution A is printed on the surface of the substrate to form a high-frequency rare earth soft magnetic layer, and the mixed solution B is printed on the surface of the high-frequency rare earth soft magnetic layer to obtain a high-frequency rare earth soft magnetic layer/FeSiAl layer, printing the mixed solution C onto the surface of the FeSiAl layer to obtain a high-frequency rare earth soft magnetic layer/FeSiAl layer/carbonyl iron layer, and obtaining a wave-absorbing material with a composite structure after curing.
所述溶剂为丙酮、正己烷、环己酮、丁苯、二甲苯、异丁醇中的一种或者多种。The solvent is one or more of acetone, n-hexane, cyclohexanone, butylbenzene, xylene and isobutanol.
所述固化工艺为在100-300℃下固化1-2h。The curing process is curing at 100-300° C. for 1-2 hours.
本发明的发明原理如下：由于单层吸波材料难以达到理想的效果，常常要用多种吸波材料叠加组成多层结构吸波体。多层结构吸波体所需要的电磁兼容频带和带宽可以通过材料改进来实现。多层结构型吸波材料最大的难点是阻抗的匹配问题。通常而言，电磁波在进入吸波材料过程中会随着材料磁电特性的变化而具有不同的进入能力。本发明针对的是磁性材料，随着材料磁导率的梯度变化(比如由低到高)，电磁波的进入能力将会呈现出逐步变弱的趋势。由此可见，采用具有阻抗渐变结构的多层结构吸波体，通过阻抗匹配层的匹配作用，使空间入射来的电磁波可以尽可能多地进入吸收层而被损耗与吸收。在本发明中，以低介电常数、低磁导率、高频性能好的球形羰基铁粉作为最外层；以中频吸收强的片状FeSiAl作为过渡层；以高介电常数、高磁导率、低频损耗大的高频稀土软磁材料作为高损耗底层。最终通过综合优化工艺，得到具有宽频吸收能力的雷达隐身吸波材料。The inventive principle of the present invention is as follows: Since it is difficult to achieve the ideal effect with a single layer of absorbing material, it is often necessary to superimpose multiple absorbing materials to form a multi-layer structure absorbing body. The electromagnetic compatibility frequency band and bandwidth required by the multilayer structure absorber can be realized through material improvement. The biggest difficulty of multi-layer structure absorbing materials is the matching of impedance. Generally speaking, when electromagnetic waves enter the wave-absorbing material, they will have different entry capabilities as the magnetic and electrical properties of the material change. The present invention is aimed at magnetic materials, and with the gradient change of material magnetic permeability (for example, from low to high), the ingress ability of electromagnetic waves will show a trend of gradually weakening. It can be seen that the use of a multi-layer structure absorber with a gradient impedance structure, through the matching effect of the impedance matching layer, allows the electromagnetic waves incident from space to enter the absorbing layer as much as possible and be lost and absorbed. In the present invention, the spherical carbonyl iron powder with low dielectric constant, low magnetic permeability, and good high-frequency performance is used as the outermost layer; the flaky FeSiAl with strong intermediate frequency absorption is used as the transition layer; The high-frequency rare-earth soft magnetic material with large conductivity and low-frequency loss is used as the high-loss bottom layer. Finally, through the comprehensive optimization process, the radar stealth absorbing material with broadband absorption ability is obtained.
本发明通过以上技术方案所获得的有益效果是：The beneficial effect that the present invention obtains through above technical scheme is:
(1)本发明的具有复合结构的吸波材料采用梯度结构设计，可以最大程度发挥材料的磁电特性，具体而言，低介电常数、低磁导率的羰基铁粉为最外层，其在高频段范围产生吸波效能；以中频吸收强的片状FeSiAl作为过渡层，其在中频范围产生吸波效能；以高介电常数、高磁导率、低频损耗大的高频稀土软磁材料作为高损耗底层，其在低频段产生吸波效能。(1) The wave-absorbing material with a composite structure of the present invention adopts a gradient structure design, which can maximize the magnetoelectric properties of the material. Specifically, the carbonyl iron powder with low dielectric constant and low magnetic permeability is the outermost layer, It produces wave-absorbing performance in the high-frequency range; using flaky FeSiAl with strong medium-frequency absorption as a transition layer, it produces wave-absorbing performance in the medium-frequency range; high-frequency rare earth soft materials with high dielectric constant, high magnetic permeability, and large low-frequency loss The magnetic material acts as a high-loss bottom layer, which produces wave-absorbing performance in the low frequency band.
(2)本发明的具有梯度的复合结构的吸波材料，可以承受较高的力学性能和抗热震性能，这为后续的隐身承载、多功能一体化奠定了一定基础。(2) The wave-absorbing material with gradient composite structure of the present invention can withstand higher mechanical properties and thermal shock resistance, which lays a certain foundation for subsequent stealth bearing and multi-functional integration.
附图说明Description of drawings
图1为具体实施方式提供的具有梯度的复合结构的吸波材料结构示意图。Fig. 1 is a schematic structural diagram of a wave-absorbing material with a gradient composite structure provided in a specific embodiment.
图2为实施例1提供的具有梯度的复合结构的吸波材料的雷达波反射率曲线图。FIG. 2 is a graph of radar wave reflectivity of the wave-absorbing material with a gradient composite structure provided in Example 1. FIG.
图3为实施例2提供的具有梯度的复合结构的吸波材料的雷达波反射率曲线图。FIG. 3 is a graph of the radar wave reflectivity curve of the wave-absorbing material with a gradient composite structure provided in Example 2. FIG.
图4为对比例1提供的具有梯度的复合结构的吸波材料的雷达波反射率曲线图。FIG. 4 is a curve graph of radar wave reflectivity of the wave-absorbing material with a gradient composite structure provided in Comparative Example 1. FIG.
具体实施方式Detailed ways
以下结合具体实施例对本发明做进一步说明。但本发明的保护范围并不仅限于此。The present invention will be further described below in conjunction with specific examples. But the protection scope of the present invention is not limited thereto.
实施例1Example 1
一种具有复合结构梯度的吸波材料，如图1所示，其由内至外依次包括高频稀土软磁、铁硅铝以及羰基铁外层；具体实施如下：A wave-absorbing material with a composite structural gradient, as shown in Figure 1, which sequentially includes a high-frequency rare earth soft magnet, sendust and carbonyl iron outer layer from the inside to the outside; the specific implementation is as follows:
(1)将环氧树脂3D打印液20wt％，高频稀土软磁70wt％，纳米二氧化硅分散剂5wt％，环己酮5wt％初步混合，搅拌机慢速搅拌2h后，在金属基底上采用3D打印高频稀土软磁吸波涂层，厚度为0.8mm。(1) Preliminarily mix 20wt% of epoxy resin 3D printing liquid, 70wt% of high-frequency rare earth soft magnetic, 5wt% of nano-silica dispersant, and 5wt% of cyclohexanone. 3D printing high-frequency rare earth soft magnetic wave-absorbing coating with a thickness of 0.8mm.
(2)将环氧树脂3D打印液50wt％，铁硅铝20wt％，纳米二氧化硅分散剂20wt％，环己酮10wt％初步混合，搅拌机慢速搅拌2h后，在步骤(1)得到的高频稀土软磁吸波涂层表面上采用3D打印铁硅铝吸波涂料，厚度为0.3mm；形成铁硅铝/高频稀土软磁吸波涂层。(2) Preliminarily mix 50wt% of epoxy resin 3D printing solution, 20wt% of sendust, 20wt% of nano-silica dispersant, and 10wt% of cyclohexanone, and stir at a slow speed for 2 hours with the mixer, and obtain in step (1) The surface of the high-frequency rare earth soft magnetic wave-absorbing coating is made of 3D printed sendust wave-absorbing paint, with a thickness of 0.3mm; forming a sendust/high-frequency rare earth soft magnetic wave-absorbing coating.
(3)将环氧树脂3D打印液50wt％，羰基铁10wt％，纳米二氧化硅分散剂30wt％，环己酮10％初步混合，搅拌机慢速搅拌2h后，在(2)得到的铁硅铝/高频稀土软磁吸波涂层上采用3D打印羰基铁吸波涂料，厚度为0.2mm；形成铁硅铝/高频稀土软磁/羰基铁吸波涂层，在200℃下固化1h得到具有复合结构梯度的吸波材料，通过大板弓形法(国标测试方法GJB2038A-2011-RL)测试得到吸波性能。如图2所示，实施例1制备的材料在2-18GHz频段内的最大反射率为-42dB,有效频带覆盖宽度为6.5GHz。表1为实施例力学性能对照表。(3) Preliminarily mix 50wt% of epoxy resin 3D printing solution, 10wt% of carbonyl iron, 30wt% of nano-silica dispersant, and 10% of cyclohexanone. 3D printing carbonyl iron absorbing coating is used on the aluminum/high frequency rare earth soft magnetic wave absorbing coating with a thickness of 0.2mm; form sendust/high frequency rare earth soft magnetic/carbonyl iron wave absorbing coating, cured at 200°C for 1 hour The absorbing material with composite structure gradient was obtained, and the absorbing performance was obtained through the large plate bow method (national standard test method GJB2038A-2011-RL). As shown in Figure 2, the material prepared in Example 1 has a maximum reflectance of -42dB in the 2-18GHz frequency band, and an effective frequency band coverage width of 6.5GHz. Table 1 is a comparison table of the mechanical properties of the examples.
实施例2Example 2
(1)将环氧树脂3D打印液20wt％，高频稀土软磁70wt％，纳米二氧化硅分散剂5wt％，环己酮5wt％初步混合，搅拌机慢速搅拌2h后，在金属基底上采用3D打印高频稀土软磁吸波涂料，厚度为1mm。(1) Preliminarily mix 20wt% of epoxy resin 3D printing liquid, 70wt% of high-frequency rare earth soft magnetic, 5wt% of nano-silica dispersant, and 5wt% of cyclohexanone. 3D printing high-frequency rare earth soft magnetic wave-absorbing coating with a thickness of 1mm.
(2)将环氧树脂3D打印液50wt％，铁硅铝20wt％，纳米二氧化硅分散剂20wt％，环己酮10wt％初步混合，搅拌机慢速搅拌2h后，在在(1)基础上采用3D打印铁硅铝吸波涂料，厚度为0.4mm；形成铁硅铝/高频稀土软磁吸波涂料，(2) Preliminarily mix 50wt% of epoxy resin 3D printing solution, 20wt% of sendust, 20wt% of nano-silica dispersant, and 10wt% of cyclohexanone. After stirring at a slow speed for 2 hours, based on (1) Using 3D printed sendust absorbing coating with a thickness of 0.4mm; forming sendust/high frequency rare earth soft magnetic absorbing coating,
(3)将环氧树脂3D打印液50wt％，羰基铁10wt％，纳米二氧化硅分散剂30wt％，环己酮10wt％初步混合，搅拌机慢速搅拌2h后，在(2)基础上采用3D打印羰基铁吸波涂料，厚度为0.4mm；形成铁硅铝/高频稀土软磁/羰基铁吸波涂料；在200℃下固化1h得到具有复合结构梯度的吸波材料。其性能如图3所示，实施例2制备的材料在2-18GHz频段内的最大反射率为-45dB,有效频带覆盖宽度为5GHz。表1为实施例力学性能对照表。(3) Preliminarily mix 50wt% of epoxy resin 3D printing solution, 10wt% of carbonyl iron, 30wt% of nano-silica dispersant, and 10wt% of cyclohexanone. Print carbonyl iron wave-absorbing coating with a thickness of 0.4mm; form sendust/high-frequency rare earth soft magnetic/carbonyl iron wave-absorbing coating; cure at 200°C for 1 hour to obtain a wave-absorbing material with a composite structural gradient. Its performance is shown in Figure 3. The material prepared in Example 2 has a maximum reflectance of -45dB in the 2-18GHz frequency band and an effective frequency band coverage of 5GHz. Table 1 is a comparison table of the mechanical properties of the examples.
对比例1Comparative example 1
(1)将环氧树脂3D打印液50wt％，羰基铁10wt％，纳米二氧化硅分散剂30wt％，环己酮10wt％初步混合，搅拌机慢速搅拌2h后，在金属基底上采用3D打印羰基铁涂料，厚度为0.2mm。(1) Preliminarily mix 50wt% of epoxy resin 3D printing liquid, 10wt% of carbonyl iron, 30wt% of nano-silica dispersant, and 10wt% of cyclohexanone. After stirring at a slow speed for 2 hours, 3D printing carbonyl is used on the metal substrate. Iron paint with a thickness of 0.2mm.
(2)将环氧树脂3D打印液50wt％，铁硅铝20wt％，纳米二氧化硅分散剂20wt％，环己酮10wt％初步混合，搅拌机慢速搅拌2h后，在在(1)基础上采用3D打印铁硅铝吸波涂料，厚度为0.3mm；形成铁硅铝/羰基铁吸波涂料，(2) Preliminarily mix 50wt% of epoxy resin 3D printing solution, 20wt% of sendust, 20wt% of nano-silica dispersant, and 10wt% of cyclohexanone. After stirring at a slow speed for 2 hours, based on (1) 3D printed sendust absorbing coating with a thickness of 0.3mm; forming sendust/carbonyl iron absorbing coating,
(3)将环氧树脂3D打印液20wt％，高频稀土软磁70wt％，纳米二氧化硅分散剂5wt％，环己酮5wt％初步混合，搅拌机慢速搅拌2h后，在(2)基础上采用3D打印高频稀土软磁吸波涂料，厚度为0.8mm；形成高频稀土软磁/铁硅铝/羰基铁吸波涂料；在200℃下固化1h得到具有复合结构梯度的吸波材料。其性能如图4所示，在2-18GHz频段内的最大反射率为-20dB,有效频带覆盖宽度为2.5GHz。表1为实施例力学性能对照表。(3) Preliminarily mix 20wt% of epoxy resin 3D printing liquid, 70wt% of high-frequency rare earth soft magnetic, 5wt% of nano-silica dispersant, and 5wt% of cyclohexanone, and stir at a slow speed for 2 hours with the mixer, and then mix it on the basis of (2) 3D printing high-frequency rare earth soft magnetic wave-absorbing coating with a thickness of 0.8mm is used to form a high-frequency rare-earth soft magnetic/silicon aluminum/carbonyl iron wave-absorbing coating; cured at 200°C for 1 hour to obtain a wave-absorbing material with a composite structural gradient . Its performance is shown in Figure 4. The maximum reflectivity in the 2-18GHz frequency band is -20dB, and the effective frequency band coverage is 2.5GHz. Table 1 is a comparison table of the mechanical properties of the examples.
表1力学性能对照表Table 1 Comparison table of mechanical properties
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