Synthesis of nanostructured composite material based on nanodiamonds modified by silicon

Abstract

Composite nanostructured powder nanodiamond–SiC with particles of size from 0.1 to 5 μm is synthesized on the basis of nanodiamonds modified by carbon and silicon under vacuum annealing. A compact diamond composite material consisting of nanostructured grains of size 0.2-0.5 microns is formed as a result of high pressure-high temperature sintering of the powder under the pressure range of 1.0-2.5 GPa. The mechanical milling of the synthesized compacts makes it possible to obtain a polycrystalline diamond micropowder with submicron- and nanocrystalline structure with particles of size up to 50 μm.