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Temperature-dependent microstructure and phase evolution of iron-containing SiC fibers

机译：含铁SiC纤维的随温度变化的微观结构和相变

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摘要

Oxygen-free silicon carbide (SiC) fibers were prepared by using polycarbosilane and iron pentacarbonyl [Fe(CO)_5] as the raw material. The developments in microstructure and phase of the fibers upon the selected heat-treated temperatures were studied by XRD, FTIR, DTA-TG, SEM, and TEM techniques. The results revealed that the sintering of SiC fibers was promoted by introducing small amount of Fe. The iron-containing nanoparticles existed in the form of α-Fe in the SiC fibers pyrolyzed below 1000 °C. Above 1200 °C, most of the iron-containing nanoparticles existed in the form of Fe_3Si. The SiC grains became obviously coarse above 1600 °C due to the decomposition of SiC_xO_y. After being sintered at 1800 °C, the final iron-containing SiC fibers were oxygen-free and remained dense.
机译：以聚碳硅烷和五羰基铁[Fe（CO）_5]为原料，制备了无氧碳化硅（SiC）纤维。通过XRD，FTIR，DTA-TG，SEM和TEM技术研究了所选热处理温度下纤维的微观结构和相的发展。结果表明，通过引入少量的Fe促进了SiC纤维的烧结。低于1000°C的热解SiC纤维中，含铁纳米粒子以α-Fe的形式存在。高于1200°C，大多数含铁纳米粒子以Fe_3Si的形式存在。由于SiC_xO_y的分解，SiC晶粒在1600°C以上明显变粗。在1800°C烧结后，最终的含铁SiC纤维不含氧，并保持致密。

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