Enhancement of radar-infrared stealth performance of EPDM-based composites through the asymmetric sandwich structural construction

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology Pub Date : 2024-11-23 DOI:10.1016/j.compscitech.2024.110981

Zikang Han, Rong Chen, Jiang Li, Shaoyun Guo

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Abstract

The development of radar-infrared-compatible stealth materials is crucial for the weaponry stealth field. However, reconciling the mechanistic contradiction between radar and infrared stealth remains a challenge. In this study, an asymmetrical sandwich structure composite was developed, with an absorbing layer situated in the middle and low emissivity layers on either side. The structure and properties of the functional layers were optimized: In the absorbing layer, ethylene propylene diene monomer/carbon nanotubes/silica (EPDM/CNTs/SiO₂) was foamed to enhance its microwave absorption and thermal insulation properties. In the low emissivity layers, the orientation of the flake aluminum powders was adjusted to reduce the infrared emissivity to as low as 0.236 and 0.183 at 3∼5 and 8∼14 μm, respectively. As a result, the composite achieved an effective absorption bandwidth of 7.26 GHz and maintained an equilibrium temperature of 29.4 °C after being placed on a 60 °C hot stage, demonstrating excellent infrared stealth performance. Additionally, the composite has a suitable density (0.77 g/cm³) and thickness (3.58 mm). Considering its broad bandwidth, low emissivity, lightness, and softness, the sandwich structure composite is suitable for compatible stealth applications.

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通过非对称夹层结构提高 EPDM 基复合材料的雷达-红外隐形性能

开发雷达-红外兼容的隐身材料对武器隐身领域至关重要。然而，如何协调雷达和红外隐身之间的机理矛盾仍然是一个挑战。本研究开发了一种非对称夹层结构复合材料，中间为吸收层，两侧为低发射率层。对功能层的结构和性能进行了优化：在吸收层中，发泡了乙丙橡胶/碳纳米管/二氧化硅（EPDM/CNTs/SiO2），以增强其微波吸收和隔热性能。在低发射率层中，调整了片状铝粉的取向，使其在 3∼5 和 8∼14 μm 处的红外发射率分别降至 0.236 和 0.183。因此，该复合材料的有效吸收带宽达到了 7.26 GHz，并在置于 60 °C 热台上后保持了 29.4 °C 的平衡温度，显示出卓越的红外隐身性能。此外，该复合材料还具有合适的密度（0.77 克/立方厘米）和厚度（3.58 毫米）。考虑到其带宽宽、发射率低、重量轻和柔软性，三明治结构复合材料适用于兼容隐身应用。

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来源期刊

Composites Science and Technology 工程技术-材料科学：复合

CiteScore

16.20

自引率

9.90%

发文量

611

审稿时长

33 days

期刊介绍： Composites Science and Technology publishes refereed original articles on the fundamental and applied science of engineering composites. The focus of this journal is on polymeric matrix composites with reinforcements/fillers ranging from nano- to macro-scale. CSTE encourages manuscripts reporting unique, innovative contributions to the physics, chemistry, materials science and applied mechanics aspects of advanced composites. Besides traditional fiber reinforced composites, novel composites with significant potential for engineering applications are encouraged.