Nanolayered Diamond Sintered Compact Obtained by Direct Conversion from Highly Oriented Graphite under High Pressure and High Temperature

作者：Isobe Futoshi^*; Ohfuji Hiroaki; Sumiya Hitoshi; Irifune Tetsuo

来源：Journal of Nanomaterials, 2013, 2013: 380165.

DOI：10.1155/2013/380165

A new type of polycrystalline sintered diamond has been successfully synthesized by direct conversion from highly oriented pyrolytic graphite at 15GPa and 2300 degrees C. It is optically transparent and consists entirely of layered nanocrystals (50-100nm thick) of cubic diamond, which are tightly bound to each other and have strong [111] preferred orientation along the stacking direction. This nanolayered diamond has excellent indentation hardness (similar to 114GPa in Knoop scale) comparable to the highest values obtained from single crystalline diamond. Furthermore, it is expected to have significantly high wear resistance on both ends of cylindrical sintered compact, since the surfaces are terminated exclusively by the hardest {111} planes of the layered diamond nanocrystals.

• 出版日期2013