Crystallization Behavior and Controlling Mechanism of Iron-Containing Si−C−N Ceramics

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• 作者：Adel Francis ; Emanuel Ionescu ; Claudia Fasel ; Ralf Riedel
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：November 2, 2009
• 年：2009
• 卷：48
• 期：21
• 页码：10078-10083
• 全文大小：871K
• 年卷期：v.48,no.21(November 2, 2009)
• ISSN：1520-510X

文摘

The crystallization behavior and controlling mechanism of the Si−Fe−C−N system based on polymer-derived SiCN ceramic filled with iron metal powder has been studied. The composite preparation conditions allow the formation of a random distribution of metallic particles in the polymer matrix volume for the Si−C−N system. Pyrolysis of the composite material at 1100 °C indicates the presence of one crystalline phase Fe₃Si. While the sample pyrolyzed at 1200 °C reveals the formation of both Fe₃Si and Fe₅Si₃ phases, a crystallization of β−SiC is additionally observed by increasing the temperature up to 1300 °C. The propensity for the formation of SiC is due to the presence of Fe₅Si₃, where a solid−liquid−solid (SLS) growth mechanism was suggested to occur. X-ray diffraction (XRD), scanning electron microscopy (SEM), differential thermal analysis (DTA), and thermal gravimetric analysis with mass spectroscopic detection (TGA-MS) were employed to investigate the crystallization behavior of the Si−Fe−C−N system.