Dual metal synergistic modulation of boron nitride for high-temperature wave-transparent metamaterials†

IF 12.2 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Zhangwen Xie, Yufei Tang, Ziyun Luo, Yagang Zhang, Wanxing Zheng, Xi Chen, Qingnan Meng, Chen Tang, Zhaowei Liu and Kang Zhao
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Abstract

Electromagnetic metamaterials have demonstrated immense potential in the development of novel high-temperature wave-transparent materials, yet the requirements of their intricate structural design and strict stability pose dual challenges, particularly in high-speed radome applications. A strategy involving the synergistic modulation of boron nitride (BN) by dual metallic elements of Ca and Al (0.5Ca–0.5Al–BN) was proposed in this study, which elegantly integrates the advantages of metamaterial-like split ring resonator (SRR) features and h-BN's oxidation resistance enhancement. The highest wave transmittance at room temperature reaches 0.96 at 2–18 GHz. Notably, Al elements play a pivotal dual role in: (1) facilitating the solid solution of Ca to optimize the formation of metamaterial-like structures and (2) generating an amorphous Al2O3 protective layer to preferentially defend against surface oxidation. This further prevents the breakdown of metamaterial characteristics at high temperatures, thereby striking a dual balance between the preservation of metamaterial-like structures and the high temperature stability of BN. Notably, 0.5Ca–0.5Al–BN retains its metamaterial-like characteristics, with a low permittivity not exceeding 2 even after exposure to 1500 °C oxidation. The corresponding wave transmission rate remains above 0.7 in most frequency bands at incidence angles of 0°, 10°, and 30°, ensuring superior wave-transparent properties. Furthermore, 0.5Ca–0.5Al–BN exhibits great hydrophobicity, benefiting resistance to rain and snow erosion. By integrating the merits between fundamental materials and metamaterials, this work transcends the limitations of conventional metamaterial design and offers fresh insights and empirical support for developing high-speed aircraft radome materials.

Abstract Image

高温波透明超材料中氮化硼的双金属协同调制。
电磁超材料在新型高温波透明材料的发展中显示出巨大的潜力,但其复杂的结构设计和严格的稳定性要求带来了双重挑战,特别是在高速天线罩应用中。本研究提出了一种由Ca和Al双金属元素(0.5Ca-0.5Al-BN)协同调制氮化硼(BN)的策略,该策略巧妙地结合了类超材料劈裂环谐振器(SRR)特性和h-BN抗氧化性增强的优点。在室温下,2-18 GHz波段的透射率最高,达到0.96。值得注意的是,Al元素在以下方面起着关键的双重作用:(1)促进Ca的固溶,优化超材料样结构的形成;(2)产生非晶Al2O3保护层,优先防御表面氧化。这进一步防止了高温下超材料特性的破坏,从而在保存类超材料结构和BN的高温稳定性之间达到了双重平衡。值得注意的是,0.5Ca-0.5Al-BN保持了其类似超材料的特性,即使在1500℃氧化后,其介电常数也不超过2。在入射角为0°、10°和30°的大多数频段,相应的波透射率保持在0.7以上,确保了优异的波透明性能。此外,0.5Ca-0.5Al-BN具有良好的疏水性,有利于抵抗雨雪侵蚀。通过整合基础材料和超材料的优点,突破了传统超材料设计的局限,为高速飞机天线罩材料的开发提供了新的见解和经验支持。
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来源期刊
Materials Horizons
Materials Horizons CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
18.90
自引率
2.30%
发文量
306
审稿时长
1.3 months
期刊介绍: Materials Horizons is a leading journal in materials science that focuses on publishing exceptionally high-quality and innovative research. The journal prioritizes original research that introduces new concepts or ways of thinking, rather than solely reporting technological advancements. However, groundbreaking articles featuring record-breaking material performance may also be published. To be considered for publication, the work must be of significant interest to our community-spanning readership. Starting from 2021, all articles published in Materials Horizons will be indexed in MEDLINE©. The journal publishes various types of articles, including Communications, Reviews, Opinion pieces, Focus articles, and Comments. It serves as a core journal for researchers from academia, government, and industry across all areas of materials research. Materials Horizons is a Transformative Journal and compliant with Plan S. It has an impact factor of 13.3 and is indexed in MEDLINE.
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