Production of Polycrystalline Materials by Sintering of Nanodispersed Diamond Nanopowders at High Pressure. Review

Resumo

The investigations dealing with the problems of forming polycrystalline materials with a high level of physical-and-mechanical properties using the method of diamond powder sintering at high pressure have been considered. The compacting mechanism of diamond nanopowders of different genesis under exposure to high pressure and high temperature is described, special features of pore structure formations are considered, and the critical role of the specified factor in sintering is shown. The need of degassing and modification of the diamond particle surface during the preparation for sintering is noted. The effectiveness of tungsten and its compounds is shown as an activating addition for producing wear-resistant thermostable diamond nanocomposites.