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    Effect of thermal annealing on nanostructure and shape transition in SiC–C nanocomposites

    Access Status
    Fulltext not available
    Authors
    Zhu, Y.
    Zhou, Z.
    Lu, Chunsheng
    Liao, X.
    Shen, Y.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhu, Yiwei, and Zhou, Zhifent and Lu, Chunsheng and Liao, Xiaozhou and Shen, Yaogen. 2012. Effect of thermal annealing on nanostructure and shape transition in SiC–C nanocomposites. Nanoscience and Nanotechnology Letters. 4 (4): pp. 435-440.
    Source Title
    Nanoscience and Nanotechnology Letters
    DOI
    10.1166/nnl.2012.1329
    ISSN
    19414900
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/5740
    Collection
    • Curtin Research Publications
    Abstract

    Controllable low-temperature (500 °C) deposition of SiC–C (3–10 vol.%C) composite ceramic films on Si(100) was achieved using a pulsed dc-magnetron puttering system in a mixture of CH4/Ar, followed by annealing in 600–1000 °C. At annealing temperatures of 800 °C or above, the formation of equiaxed SiC nanocrystals (NCs) was accompanied by near-elongated nano-C (graphite). These SiC NCs are chemically pure, highly stoichiometric, and have typical sizes of 6–24 nm. After further annealing at 1000 °C, SiC NCs were also in the form of regular grains with an average size of ~55 nm, whereas elongated nano-C grains were transformed to graphite nanorods (NRs) with widths of 5–20 nm and lengths of 30–120 nm. The greatly enhanced mechanical properties of SiC–C nanocomposites are attributed to their improved nanostructure comprising of SiC NCs surrounded by nano-C NR matrices. The formation of graphite NRs is also interpreted by an oxide-assisted growth mechanism.

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