Preparation of Si-Al-N-C ceramic composites by pyrolysis of blended precursors

Yusuke Mori, Takeshi Ueda, Satoshi Kitaoka, Yoshiyuki Sugahara

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 dehydro-coupling 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.

Original languageEnglish
Pages (from-to)497-501
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume114
Issue number1330
DOIs
Publication statusPublished - 2006 Jun

Keywords

  • Aluminum nitride
  • Ceramic-based composites
  • Polysilazane
  • Precursors
  • Silicon carbide

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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