Polycrystalline cubic boron nitride prepared with cubic-hexagonal boron nitride under high pressure and high temperature

Yang Ming¹, Kou Zi-Li^{1, †}, Liu Teng¹, Lu Jing-Rui¹, Liu Fang-Ming², Liu Yin-Juan¹, Qi Lei¹, Ding Wei¹, Gong Hong-Xia¹, Ni Xiao-Lin¹, He Duan-Wei¹

(color online) (a) Vickers hardness of samples sintered at 6.5–10.0 GPa/1750 °C with an applied load of 29.4 N. Inset: micrograph of Vickers hardness indentation. (b) Applied load dependence of Vickers hardness of the sample sintered at 7.7 GPa/1750 °C.