Microstructural characterization of commercial hot-pressed boron carbide ceramics

Mingwei Chen, J. W. McCauley, J. C. LaSalvia, K. J. Hemker

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    122 Citations (Scopus)

    Abstract

    Two commercial hot-pressed boron carbide ceramics were investigated by transmission electron microscopy. Atomic-scale observations suggest that the grain boundaries of the two materials are free of grain-boundary films. Two triple-junction phases were found and characterized to be rhombohedral Fe 2B 103 and orthorhombic Ti 3B 4. In addition, intra-granular precipitates, AIN, Mo 2(C, B) and graphite, were identified and found to have coherent relationships with the boron carbide matrix. Micron-scale inclusions were also observed and most of them were determined to be graphite. The formation mechanisms of the secondary phases and their possible influence on mechanical properties are also discussed.

    Original languageEnglish
    Pages (from-to)1935-1942
    Number of pages8
    JournalJournal of the American Ceramic Society
    Volume88
    Issue number7
    DOIs
    Publication statusPublished - 2005 Jul 1

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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