Polycrystalline cubic boron nitride prepared with cubic-hexagonal boron nitride under high pressure and high temperature |
SEM images of fracture surfaces of PcBN samples sintered at various P–T conditions. (a) 6.5 GPa/1750 °C. (b) 7.7 GPa/1750 °C. (c) 9.0 GPa/1750 °C. (d) 10.0 GPa/1750 °C. |