EXPERIMENTAL STUDIES ON THE PREPARATION OF FUNCTIONALLY ORIENTED SYNTHETIC DIAMOND POWDER

Abstract

Experimental studies of synthetic diamond powder of the AC20 grade with a grain size of 100/80 have shown that the
influence of the methods of modifying the original powder (modification by high-voltage electric discharges or liquid-phase
oxidation) is reflected in the change in the adsorption-structural and morphometric characteristics of the powders: in particular,
the specific surface area; specific pore volume; average pore radius; total pore volume, and the distribution of pore volume by
their sizes. The specific surface area of the original samples tends to decrease after the modification of the powders. The studied
samples have a developed mesoporous surface structure. The studied modification methods do not show a significant effect on
the morphometric characteristics of the powders. Comparative analysis of the results by the coefficients of linear approximation
of the pore size distribution curves allows us to obtain at the quantitative level the indicator (а2/а1) of the change in the state of
the powder surface, which can serve as a characteristic of the quality of the powder surface when studying the defectivity of the
surface of synthetic diamond grains and its influence on the operational characteristics of the diamond tool. The results obtained
provide a basis for further development of a database for the formation of optimal indicators of the adsorption-structural
characteristics of synthetic diamond powders of wide functional purpose.