Oxidation of polymer-derived SiAlCN ceramics

    Authors

    Y. G. Wang; L. N. An; Y. Fan; L. G. Zhang; S. Burton;Z. H. Gan

    Comments

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    Abbreviated Journal Title

    J. Am. Ceram. Soc.

    Keywords

    AMORPHOUS-SILICON CARBONITRIDE; CATALYST-ASSISTED PYROLYSIS; C-N; CERAMICS; HIGH-TEMPERATURE; THERMAL-OXIDATION; VITREOUS SILICA; PRECURSOR; KINETICS; BEHAVIOR; CORROSION; Materials Science, Ceramics

    Abstract

    The oxidation behavior of polymer-derived amorphous SiAlCNs was studied in the temperature range of 900 degrees-1200 degrees C. The results revealed that while at 900 degrees C the oxidation of the SiAlCNs follows typical parabolic kinetics, at higher temperatures the oxidation rates of the materials decrease with annealing time. Long-term oxidation rate of the SiAlCNs is much lower than the lowest values reported for chemical vapor deposition of SiC and Si(3)N(4). Structures of the oxide scales were studied using solid-state nuclear magnetic resonance. We proposed that oxide scales formed for the SiAlCNs possess a unique network structure of the oxide scale in which aluminum atoms block the path of oxygen diffusion, thus lowering the oxidation rates. Such a unique structure was likely formed gradually with annealing time, leading to a continuous decrease in oxidation rate.

    Journal Title

    Journal of the American Ceramic Society

    Volume

    88

    Issue/Number

    11

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    3075

    Last Page

    3080

    WOS Identifier

    WOS:000232773100015

    ISSN

    0002-7820

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