抄録
<jats:p>We report here the high-pressure synthesis of well-sintered millimeter-sized bulks of superhard BC<jats:sub>2</jats:sub>N and BC<jats:sub>4</jats:sub>N 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 <jats:italic>P–T</jats:italic> 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 <jats:italic>P</jats:italic>–<jats:italic>T</jats:italic> synthetic products of BC<jats:sub>2</jats:sub>N, BC<jats:sub>4</jats:sub>N, and segregated phases of diamond + <jats:italic>c</jats:italic>BN composite confirm the existence of the single B–C–N ternary phases.</jats:p>
収録刊行物
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- Journal of Materials Research
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Journal of Materials Research 17 (12), 3139-3145, 2002-12
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