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
    JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
    Volume114
    Issue number1330
    DOIs
    Publication statusPublished - 2006 Jun

    Fingerprint

    Nuclear magnetic resonance spectroscopy
    pyrolysis
    Pyrolysis
    magnetic resonance spectroscopy
    ceramics
    preparation
    Spectroscopic analysis
    composite materials
    Composite materials
    X ray diffraction analysis
    solid state
    Polymers
    nuclear magnetic resonance
    spectroscopic analysis
    Crystalline materials
    linkages
    polymers
    diffraction
    perhydropolysilazane
    x rays

    Keywords

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

    ASJC Scopus subject areas

    • Ceramics and Composites

    Cite this

    Preparation of Si-Al-N-C ceramic composites by pyrolysis of blended precursors. / Mori, Yusuke; Ueda, Takeshi; Kitaoka, Satoshi; Sugahara, Yoshiyuki.

    In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 114, No. 1330, 06.2006, p. 497-501.

    Research output: Contribution to journalArticle

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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 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.",
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    AU - Ueda, Takeshi

    AU - Kitaoka, Satoshi

    AU - Sugahara, Yoshiyuki

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    KW - Precursors

    KW - Silicon carbide

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