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

Francis, Adel and Ionescu, Emanuel and Fasel, Claudia and Riedel, Ralf (2009):
Crystallization Behavior and Controlling Mechanism of Iron-Containing Si−C−N Ceramics.
In: Inorganic Chemistry, ACS, pp. 10078-10083, 48, (21), ISSN 0020-1669,
[Online-Edition: http://dx.doi.org/10.1021/ic900934u],
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2009
Creators: Francis, Adel and Ionescu, Emanuel and Fasel, Claudia and Riedel, Ralf
Title: Crystallization Behavior and Controlling Mechanism of Iron-Containing Si−C−N Ceramics
Language: English
Abstract:

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.

Journal or Publication Title: Inorganic Chemistry
Volume: 48
Number: 21
Publisher: ACS
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 13 Apr 2012 09:16
Official URL: http://dx.doi.org/10.1021/ic900934u
Identification Number: doi:10.1021/ic900934u
Funders: This work was financially supported by the Alexander von Humboldt (AvH) foundation., A.F. is grateful to the AvH foundation for support in the form of the Georg-Forster fellowship for experienced researchers., R.R. acknowledges the financial support by the Fonds der Chemischen Industrie, Frankfurt, Germany.
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