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Superhard B–C–N materials synthesized in nanostructured bulks

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Abstract

We report here the high-pressure synthesis of well-sintered millimeter-sized bulks of superhard BC2N and BC4N materials in the form of a nanocrystalline composite with diamond-like amorphous carbon grain boundaries. The nanostructured superhard B–C–N material bulks were synthesized under high P–T conditions from amorphous phases of the ball-milled molar mixtures. The synthetic B–C–N samples were characterized by synchrotron x-ray diffraction, high-resolution transmission electron microscope, electron energy-loss spectra, and indentation hardness measurements. These new high-pressure phases of B–C–N compound have extreme hardnesses, second only to diamond. Comparative studies of the high P–T synthetic products of BC2N, BC4N, and segregated phases of diamond + cBN composite confirm the existence of the single B–C–N ternary phases.

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Authors and Affiliations

  1. Los Alamos National Laboratory, 87545, Los Alamos, Mexico

    Y. Zhao, D. W. He, L. L. Daemen, T. D. Shen, R. B. Schwarz, Y. Zhu, D. L. Bish, J. Huang & J. Qian

  2. Department of Physics, Boston College, 02467, Massachusetts, USA

    J. Huang

  3. Mineral Physics Institute, State University of New York, 11794, Stony Brook, New York, USA

    J. Zhang

  4. Consortium for Advanced Radiation Sources, University of Chicago, 60637, Chicago, Illinois, USA

    G. Shen

  5. Department of Physics & Astronomy, Texas Christian University, 76129, Fort Worth, Texas, USA

    J. Qian

  6. Department of Physics & Astronomy, Texas Christian University, 76129, Fort Worth, Texas, USA

    T. W. Zerda

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  1. Y. Zhao
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  2. D. W. He
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  3. L. L. Daemen
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  8. J. Huang
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Correspondence to Y. Zhao.

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Zhao, Y., He, D.W., Daemen, L.L. et al. Superhard B–C–N materials synthesized in nanostructured bulks. Journal of Materials Research 17, 3139–3145 (2002). https://doi.org/10.1557/JMR.2002.0454

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  • DOI: https://doi.org/10.1557/JMR.2002.0454

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