Journal of the Ceramic Society of Japan
Online ISSN : 1882-1022
Print ISSN : 0914-5400
Special Issue by Guest Editors: Organic-to-Inorganic Conversion Process for Polymer-Derived Ceramics: Papers
Preparation of Si-Al-N-C Ceramic Composites by Pyrolysis of Blended Precursors
Yusuke MORITakeshi UEDASatoshi KITAOKAYoshiyuki SUGAHARA
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2006 Volume 114 Issue 1330 Pages 497-501

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Abstract

Si-Al-N-C precursors have been prepared from perhydropolysilazane (PHPS) and cage-type poly(ethyliminoalane) [(HAlNEt)n; PEIA, n is mainly 8] with different Si/Al molar ratios (Si/Al=3, 1, 1/3). Spectroscopic analysis indicates that essentially no Si-N-Al linkages form, indicating that the precursors are blended polymers. TG analysis reveals that the ceramic yields of the blended precursors up to 900°C are higher than those of PHPS and (HAlNEt)n, suggesting that cross-linking reactions occur during pyrolysis. Possible reactions are dehydrocoupling and radical reactions, as suggested by the results of solid-state nuclear magnetic resonance (NMR) spectroscopy. The results of solid-state NMR spectroscopy and X-ray diffraction (XRD) analysis indicate that the residue pyrolyzed at 1600°C contains mainly crystalline AlN, 2H-SiC and β-SiC.

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© 2006 The Ceramic Society of Japan
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