Nanohardness and Young’s modulus of nanopolycrystalline diamond

We present the measurement of the Young’s modulus (E) of a nanopolycrystalline diamond (NPD) sample synthesized by the direct conversion of graphite under high pressure and temperature. E has been measured along with the nanohardness (HN) using the nanoindentation technique (E = 707 GPa and HN = 62 GPa). Comparing E and HN of NPD with other commercially available superhard anvils and polycrystalline diamonds, we demonstrate its greater hardness and elastic properties.

Research highlights
► Young’s modulus (E) and hardness (HN) of nano-polycrystalline diamond (NPD) synthesized by the direct conversion of graphite under high pressure and temperature is reported for the first time.
► Mechanical properties have been measured using nanoindentation technique taking tip deformation into account.
► E and HN of NPD is higher than other commercially available superhard anvils and polycrystalline diamonds.