Microstructures and grain boundaries of cubic boron nitrides

Chunlin Chen, Rong Huang, Zhongchang Wang, Naoya Shibata, Takashi Taniguchi, Yuichi Ikuhara

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    Two types of chemically pristine polycrystalline cubic boron nitrides (c-BN) are sintered at different conditions using the starting cubic and hexagonal BN powders and their microstructures and grain boundaries are investigated systematically by transmission electron microscopy. The two c-BN samples are found to exhibit a number of twins inside their grains and have a similar grain size, despite their huge differences in the grain size of the starting powders and sintering conditions. Twin width for the c-BN sintered from hexagonal BN is significantly smaller than that for the c-BN sintered from c-BN. Grain boundaries in the two samples can be atomically abrupt without any amorphous or secondary layers and oxygen is detected merely at the grain boundaries of the c-BN sintered from the c-BN powders. Such microstructural differences have a direct impact on mechanical behaviors of the c-BN, as the Vickers hardness of the c-BN sintered from hexagonal BN powders is found to be higher than that of the c-BN sintered from the c-BN powders.

    Original languageEnglish
    Pages (from-to)27-31
    Number of pages5
    JournalDiamond and Related Materials
    Volume32
    DOIs
    Publication statusPublished - 2013

    Keywords

    • Cubic boron nitride
    • Grain boundaries
    • Hardness
    • High resolution electron microscopy
    • Microstructure

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Chemistry(all)
    • Mechanical Engineering
    • Materials Chemistry
    • Electrical and Electronic Engineering

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  • Cite this

    Chen, C., Huang, R., Wang, Z., Shibata, N., Taniguchi, T., & Ikuhara, Y. (2013). Microstructures and grain boundaries of cubic boron nitrides. Diamond and Related Materials, 32, 27-31. https://doi.org/10.1016/j.diamond.2012.11.011