Abstract
Cubic boron nitride (cBN) was synthesized using a Ni3Al alloy as a solvent under high pressure and high temperature. The range of cBN formation was determined to be between 4.5 and 6.5 GPa. In the temperature range between 1300 and 1900 °C at about 6 GPa, it seems that the formation mechanism of cBN changed. In the lower-temperature region (<1400 °C), cBN was formed by a reaction between AlN and BN, possibly under solid-state conditions. In the higher-temperature region (>1400 °C), molten Ni3Al infiltrated the starting hexagonal BN layer with rapid cBN precipitation.
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