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    Fracture toughness enhancement of silicon carbide composites with hydrophilic-modified Tyranno® Si–Al–C fibre addition

    Access Status
    Fulltext not available
    Authors
    Moriyasu, H.
    Davies, Ian
    Itatani, K.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Moriyasu, H. and Davies, I. and Itatani, K. 2017. Fracture toughness enhancement of silicon carbide composites with hydrophilic-modified Tyranno® Si–Al–C fibre addition. Advances in Applied Ceramics: Structural, Functional and Bioceramics. 116 (5): pp. 278-285.
    Source Title
    Advances in Applied Ceramics: Structural, Functional and Bioceramics
    DOI
    10.1080/17436753.2017.1305481
    ISSN
    1743-6753
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/57650
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Institute of Materials, Minerals and Mining. Published by Taylor & Francis on behalf of the Institute. The surface properties of Tyranno® Si–Al–C (SA) fibre (mean length: 0.7 mm) were modified from hydrophobic to hydrophilic nature by acid treatment of carbon-coated SA fibre, in order to enhance dispersibility or fracture toughness within silicon carbide (SiC) matrix. Two types of carbons, i.e. amorphous carbon and graphite carbon, were used to coat the surface of SA fibres (SA(AC) and SA(GC) fibres, respectively) by the pyrolysis of polyvinyl alcohol at 500°C for 30 min and 1800°C for 30 min, respectively. Then, carboxyl groups were formed on the SA(AC) and SA(GC) fibre surfaces through acid treatment (concentrated H 2 SO 4 and HNO 3 ) at room temperature. Owing to the acid treatment, SA fibre could be homogeneously mixed with SiC particles in polar solvent (acetone). The fracture toughness of SiC composites containing 40 mass% of acid-treated SA(GC) fibre (PVA/SA ratio = 2.5) hot-pressed at 1800°C for 60 min attained 8.3 MPa m 1/2 .

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