抄録
High-purity (binder-less) polycrystalline diamond can be referred to as an ideal super-hard material that has both high mechanical strength and excellent thermal stability. The authors succeeded in the synthesis of dense high-purity polycrystalline diamonds by direct conversion from graphite and non-graphitic carbons under static ultra-high pressure and high temperature. In this article, the synthetic method and some properties of the materials are reviewed. Differences in formation mechanism and properties among high-purity polycrystalline diamonds synthesized from various carbons are also described.
