Synthesis and high electromagnetic wave absorption performance of carbon-enriched porous SiOC ceramics

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-10-20 DOI:10.1016/j.jallcom.2024.177120

Pingping Mo, Anze Shui, Hulei Yu, Junjie Qian

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Abstract

The carbon-enriched porous SiOC ceramics with enhanced electromagnetic wave (EMW) absorption properties were synthesized through the hydrothermal method followed by a polymer-derived ceramics (PDCs) process. As the annealing temperature rises from 1200 °C to 1500 ℃, SiC and SiO₂ crystals are gradually separated from the porous amorphous SiOC matrix, and the degree of graphitization of free carbon increases. The porous SiOC ceramics annealed at 1400 °C exhibit the presence of SiC, SiO₂, turbostratic graphite, and amorphous SiOC phases, which significantly impact the impedance matching and attenuation constant of the material. The minimum reflection loss (RL_min) value of the SiOC ceramics reaches −67.98 dB with a matching thickness of 3.19 mm and the effective absorption bandwidth (EAB) is 4.45 GHz at 1.39 mm. The carbon-enriched porous SiOC ceramics with strong absorption capacity and wide absorption bandwidth are primarily owing to appropriate impedance matching and multiple attenuation mechanisms, such as conduction loss, interfacial polarization, and defect-induced polarization, indicating that the SiOC ceramics exhibit significant potential as a high-performance EMW absorbing material.

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富碳多孔 SiOC 陶瓷的合成与高电磁波吸收性能

通过水热法和聚合物衍生陶瓷（PDCs）工艺合成了具有增强电磁波（EMW）吸收特性的富碳多孔SiOC陶瓷。随着退火温度从 1200 ℃ 升至 1500 ℃，SiC 和 SiO2 晶体逐渐从多孔无定形 SiOC 基体中分离出来，游离碳的石墨化程度增加。在 1400 ℃ 下退火的多孔 SiOC 陶瓷显示出 SiC、SiO2、湍石墨和无定形 SiOC 相的存在，这对材料的阻抗匹配和衰减常数产生了显著影响。在匹配厚度为 3.19 毫米时，SiOC 陶瓷的最小反射损耗 (RLmin) 值达到 -67.98 dB，在 1.39 毫米时，有效吸收带宽 (EAB) 为 4.45 GHz。富碳多孔 SiOC 陶瓷之所以具有较强的吸收能力和较宽的吸收带宽，主要是由于适当的阻抗匹配和多种衰减机制（如传导损耗、界面极化和缺陷诱导极化），这表明 SiOC 陶瓷作为高性能电磁波吸收材料具有巨大的潜力。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.