Abstract
Single-phase (binderless) nano-polycrystalline diamond synthesized by direct conversion of graphite under high pressure and high temperature has a very fine texture consisting of small diamond grains (several tens of nanometers in size), having extremely high hardness, no cleavage and high thermal stability. In order to clarify its potentiality for industrial uses in cutting tools, the mechanical properties of nano-polycrystalline diamond were systematically investigated. In addition, the cutting performances of the nano-polycrystalline diamond tool for some materials were evaluated. These results revealed that the nanopolycrystalline diamond has significantly higher cutting performance than conventional sintered diamond tools or mono-crystal diamond tools.
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