Abstract
Slack [1] predicts a room temperature thermal conductivity of about 13 W/cm°C for single-crystal cubic boron nitride with only diamond having a higher conductivity among the high thermal conductivity adamantine Compounds. However, no crystals of cubic BN were available that were large enough to measure the thermal conductivity, and the highest value reported for polycrystalline compacts prepared by high-pressure/high-temperature sintering of natural isotope abundance cubic BN powder was only 1.8 W/cm°C. In this paper, natural isotope abundance polycrystalline cubic BN compacts prepared by direct high-pressure/high-temperature conversion of graphitic BN and having room temperature thermal conductivity values up to a factor of four higher than previously reported are discussed.
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