Modification of perhydropolysilazane with aluminum hydride: Preparation of poly(aluminasilazane)s and their conversion into Si-Al-N-C ceramics

Ryoji Toyoda, Satoshi Kitaoka, Yoshiyuki Sugahara

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Perhydropolysilazane (PHPS) was modified with trimethylamine-alane adduct, AlH3·NMe3, with two nominal Si/Al molar ratios (1 and 5), and the resulting poly(aluminasilazane)s were pyrolyzed under an N2 atmosphere. Poly(aluminasilazane) with a nominal Si/Al molar ratio of 5 (PAS5) was insoluble because of the formation of cross-link points via dehydrocoupling. In the system with a nominal Si/Al molar ratio of 1 (PAS1), on the contrary, AlH3·NMe3 cleaved the Si-N bonds in addition to forming Al-N bonds, drastically modifying the Si-N backbone of PHPS. In addition, a large portion of aluminium was lost in the PAS1 preparation. Thermogravimetric analysis revealed that PAS5 exhibited a ceramic yield of 78% up to 900 °C, while the ceramic yield for PAS1 was 61%. The XRD patterns of the pyrolyzed residues from PAS1 and PAS5 suggest the formation of a 2H wurtzite-type compound and silicon nitride.

    Original languageEnglish
    Pages (from-to)271-277
    Number of pages7
    JournalJournal of the European Ceramic Society
    Volume28
    Issue number1
    DOIs
    Publication statusPublished - 2008

    Fingerprint

    Aluminum
    Silicon nitride
    Hydrides
    Thermogravimetric analysis
    perhydropolysilazane
    trimethylamine
    silicon nitride

    Keywords

    • Carbides
    • Composites
    • Nitrides
    • Precursors-organic
    • X-ray methods

    ASJC Scopus subject areas

    • Ceramics and Composites

    Cite this

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    title = "Modification of perhydropolysilazane with aluminum hydride: Preparation of poly(aluminasilazane)s and their conversion into Si-Al-N-C ceramics",
    abstract = "Perhydropolysilazane (PHPS) was modified with trimethylamine-alane adduct, AlH3·NMe3, with two nominal Si/Al molar ratios (1 and 5), and the resulting poly(aluminasilazane)s were pyrolyzed under an N2 atmosphere. Poly(aluminasilazane) with a nominal Si/Al molar ratio of 5 (PAS5) was insoluble because of the formation of cross-link points via dehydrocoupling. In the system with a nominal Si/Al molar ratio of 1 (PAS1), on the contrary, AlH3·NMe3 cleaved the Si-N bonds in addition to forming Al-N bonds, drastically modifying the Si-N backbone of PHPS. In addition, a large portion of aluminium was lost in the PAS1 preparation. Thermogravimetric analysis revealed that PAS5 exhibited a ceramic yield of 78{\%} up to 900 °C, while the ceramic yield for PAS1 was 61{\%}. The XRD patterns of the pyrolyzed residues from PAS1 and PAS5 suggest the formation of a 2H wurtzite-type compound and silicon nitride.",
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    author = "Ryoji Toyoda and Satoshi Kitaoka and Yoshiyuki Sugahara",
    year = "2008",
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    language = "English",
    volume = "28",
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    T2 - Preparation of poly(aluminasilazane)s and their conversion into Si-Al-N-C ceramics

    AU - Toyoda, Ryoji

    AU - Kitaoka, Satoshi

    AU - Sugahara, Yoshiyuki

    PY - 2008

    Y1 - 2008

    N2 - Perhydropolysilazane (PHPS) was modified with trimethylamine-alane adduct, AlH3·NMe3, with two nominal Si/Al molar ratios (1 and 5), and the resulting poly(aluminasilazane)s were pyrolyzed under an N2 atmosphere. Poly(aluminasilazane) with a nominal Si/Al molar ratio of 5 (PAS5) was insoluble because of the formation of cross-link points via dehydrocoupling. In the system with a nominal Si/Al molar ratio of 1 (PAS1), on the contrary, AlH3·NMe3 cleaved the Si-N bonds in addition to forming Al-N bonds, drastically modifying the Si-N backbone of PHPS. In addition, a large portion of aluminium was lost in the PAS1 preparation. Thermogravimetric analysis revealed that PAS5 exhibited a ceramic yield of 78% up to 900 °C, while the ceramic yield for PAS1 was 61%. The XRD patterns of the pyrolyzed residues from PAS1 and PAS5 suggest the formation of a 2H wurtzite-type compound and silicon nitride.

    AB - Perhydropolysilazane (PHPS) was modified with trimethylamine-alane adduct, AlH3·NMe3, with two nominal Si/Al molar ratios (1 and 5), and the resulting poly(aluminasilazane)s were pyrolyzed under an N2 atmosphere. Poly(aluminasilazane) with a nominal Si/Al molar ratio of 5 (PAS5) was insoluble because of the formation of cross-link points via dehydrocoupling. In the system with a nominal Si/Al molar ratio of 1 (PAS1), on the contrary, AlH3·NMe3 cleaved the Si-N bonds in addition to forming Al-N bonds, drastically modifying the Si-N backbone of PHPS. In addition, a large portion of aluminium was lost in the PAS1 preparation. Thermogravimetric analysis revealed that PAS5 exhibited a ceramic yield of 78% up to 900 °C, while the ceramic yield for PAS1 was 61%. The XRD patterns of the pyrolyzed residues from PAS1 and PAS5 suggest the formation of a 2H wurtzite-type compound and silicon nitride.

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    KW - Composites

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    KW - X-ray methods

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