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4_2023_sen_9

Title of the article THERMODYNAMIC ANALYSIS OF THE FORMATION OF A NANOSTRUCTURAL POLYCRYSTALLINE MATERIAL BASED ON NANODIAMONDS MODIFIED WITH NON-DIAMOND CARBON (PART 2)
Authors

SENYUT Vladimir T., Ph. D. in Eng., Assoc. Prof., Leading Researcher of the Laboratory of Nanostructured and Superhard Materials of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

VITYAZ Petr A., Academician of the NAS of Belarus, D. Sc. in Eng., Prof., Chief Researcher of the Department of Technologies of Mechanical Engineering and Metallurgy of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

PARNITSKY Alexander M., Ph. D. in Eng., Senior Researcher of the Laboratory of Nanostructured and Superhard Materials of the R&D Center “Mechanical Engineering Technologies and Processing Equipment”, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section MATERIALS SCIENCE IN MECHANICAL ENGINEERING
Year 2023
Issue 4(65)
Pages 76–84
Type of article RAR
Index UDK 621.762:621.921.34
DOI https://doi.org/10.46864/1995-0470-2023-4-65-76-84
Abstract The paper presents the results of thermodynamic analysis showing that the use of nanodiamonds with a thin graphite-like coating formed by surface graphitization of nanodiamonds makes it possible to increase the thermodynamic stimulus for the formation of a diamond structure under conditions of high pressures and temperatures. For a thin carbon film with a disordered structure (amorphous carbon, soot), the pressure of transition into diamond will exceed the equilibrium pressure due to the lower surface energy of amorphous carbon compared to the surface energy of graphite. In this case, a decrease in the thickness of the non-diamond carbon film on the surface of a diamond particle leads to an increase in the pressure of the graphite–diamond phase transition. The proposed approach provides the possibility of reducing the synthesis parameters of nanostructured polycrystalline diamond materials without additional use of phase transformation catalysts.
Keywords nanodiamond, non-diamond forms of carbon, state diagram, phase transformations, chemical potential, Gibbs energy
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