THERMODYNAMIC ANALYSIS OF THE FORMATION OF A NANOSTRUCTURAL POLYCRYSTALLINE MATERIAL BASED ON NANODIAMONDS MODIFIED WITH NON-DIAMOND CARBON (PART 1)

The influence of the size carbon particles on parameters graphite–diamond phase transformation is considered. It shown that surface energy nanoparticles various shapes (spherical, columnar) makes a significant contribution to their total thermodynamic potential, which leads shift in diamond–graphite equilibrium curve low pressure region and an expansion diamond stability region. At same time, change chemical potential (Gibbs free energy) during direct (not catalytic) transition thin-film graphite-like nanostructures into will be higher than for “massive” graphite, increase diamond. To reduce formation obtain nanostructured polycrystals, it proposed use nanodiamond with nanometer layer non-diamond (graphitelike) as starting material. In this case, graphite (graphite-like carbon) under more favorable parameters.