Siqing Tong , Yashan Zhang , Chengyi Hou , Qinghong Zhang , Kerui Li , Zhijie Jin , Yaogang Li , Hongzhi Wang
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引用次数: 0
摘要
具有高温稳定性的全无机石英纤维增强二氧化硅是一种很有前途的用于极端环境下高保真通信电缆的低介电材料。然而,其介电性能受到固有极化- si - o -和- si - oh的限制,推动了硅基低介电材料的迫切探索,而不仅仅是调整多孔结构。本文中,氟取代二氧化硅/石英纤维复合材料(FS-SiO2)是通过开发原位蒸汽氟取代(称为VFS)策略生成的。在取代过程中,通过600℃的简单热处理,氟硅烷修饰SiO2的高极化-Si-OH键被低极化-Si-F键取代。结果,在20 MHz时,介电常数和损耗大大降低,分别为1.74和1.00 × 10−2。使用FS-SiO2介质层的通信电缆在12 GHz频率下的衰减为0.74 dB/m,优于使用纯二氧化硅/石英纤维复合材料的通信电缆,衰减为1.55 dB/m。此外,即使在550°C下进行10次热循环或在300°C下工作4小时,电缆的衰减和VSWR也几乎保持不变。
Hydroxyl-induced fluorine substitution in low dielectric all-inorganic silica composites for high fidelity communication cables under extreme environments
All-inorganic quartz fiber reinforced silica with high temperature stability is a promising low dielectric material for high-fidelity communication cables in extreme environments. However, its dielectric properties are constrained by the inherent polarizable -Si-O- and -Si-OH, driving the urgent exploration of silica-based low-dielectric materials that go beyond merely adjusting the porous structure. Herein, a fluorine-substituted silica/quartz fiber composite (FS–SiO2) is generated by developing an in situ vapor fluorine substitution (termed VFS) strategy. During the substitution process, highly polarizable -Si-OH of fluorosilane-modified SiO2 is replaced with low-polarizability -Si-F bonds through a simple thermal treatment at 600 °C. As a result, the dielectric constant and loss were highly reduced to be 1.74 and 1.00 × 10−2 at 20 MHz. The communication cable with the FS-SiO2 dielectric layer exhibited a significantly low attenuation of 0.74 dB/m at the frequency of 12 GHz, outperforming the cable using pure silica/quartz fiber composites with the attenuation of 1.55 dB/m. Furthermore, the cable's attenuation and VSWR remained nearly constant even after ten thermal cycles at 550 °C or 4 h of operation at 300 °C.
期刊介绍:
Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development.
The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.