Preparation of continuous Fe containing carbide silicon fibers and their structural radar-wave absorbing materials
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摘要: 为了研制碳化硅吸波纤维, 首次采用聚二甲基硅烷(PDMS)和二茂铁合成聚铁碳硅烷(PFCS), PFCS经多孔熔融纺丝、 空气不熔化和在N2中1320℃连续烧成, 可制得连续含铁碳化硅(SiC(Fe))吸波纤维; 用SiC(Fe)纤维与环氧树脂制备的结构材料具有良好的吸波性能。XPS剖面分析、 Raman光谱表明: 纤维表面有一层厚约100nm的富碳层, 由表及里铁的含量逐渐增加; 随着温度的升高游离碳的排列逐渐规整化。研究了碳对纤维性能的影响, 结果表明: 游离碳的存在有利于纤维电阻率的降低, 复介电常数和介电损耗的增大。
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关键词:
- 聚铁碳硅烷 /
- 连续SiC(Fe)纤维 /
- 结构吸波材料 /
- 游离碳 /
- XPS剖面分析
Abstract: In order to prepare carbide silicon radar-wave absorbing fibers, the continuous carbide silicon (SiC(Fe)) fibers containing Fe were prepared for the first time from a precursor polyferrocarbosilane (PFCS), which was synthesized from polydimethylsilane and ferrocene, followed by melt-spinning, curing in air, and continuous pyrolysis at 1320℃ in N2 atmosphere. The structural materials prepared with this fibers and resin show good radar-wave absorbing properties. XPS depth analysis shows that a carbon-enriched layer of about 100nm is formed on the surface of the fiber and the atomic concentration of element Fe increases a little from edge to inner. The free carbon arranges gradually in order with increasing the temperature by Raman spectra analysis. The effect of the free carbon on the properties of the continuous SiC(Fe) fibers was studied. The results show that the free carbon is of benefit to decreasing the specific resistance but increasing the complex permittivity (ε' and ε″) and relative complex permittivity (εr) of the fibers.
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