Influence of processes occurring in carbon-containing environment on a solid phase autopitaxy of diamond
DOI:
https://doi.org/10.30838/J.PMHTM.2413.261218.54.566Keywords:
diamond, solid-phase auto-epitaxy, cast iron, physical fields, growth medium,Abstract
Abstract. Purpose. The purpose of this work was to analyze the effect of structural rearrangements in the metal matrix of cast iron near graphite inclusions occurring at the meso-level with the complex effect of physical fields on the formation and growth characteristics of dynamic synthesis diamond. Methodology. Synthetic cast irons with different matrix and graphite form served as materials for research. Dynamic loading is carried out by striking a metal plate accelerated by the detonation products of an explosive. Some samples were subjected to forging at a temperature of 950 °C, as well as thermal cycling at a heating rate of 150 °C/min to 900 °C, holding 20...30 min, cooling with a furnace (5 cycles). The following research methods were used: metallographic (“Neophot-21”), X-ray microscopy, scanning electron microscopy (“MS-46” and “Nanolab-7”), X-ray diffraction (DRON-UM1). Findings. The influence of deformation and heat treatments on the redistribution of defects of the crystal structure under conditions of complex action of physical fields that promote the nucleation and growth of particles during solid-phase auto-epitaxy of diamond is discussed. It is shown that austenitic gray iron with lamellar graphite is the most favorable for realization of blast diamond growth. Originality. It is shown that this process is the result of a favorable combination of a number of factors: the composition and structure of the growth medium (cast iron matrix), the carbon source (graphite), temperature and deformation fields ensuring the passage of polymorphic transformation of graphite → diamond and the appearance of gradient stress fields, as well as the redistribution of defects of crystalline structure at the mesolevel in the stages of forging, explosion and thermal cycling, which facilitates the acceleration of the delivery of carbon atoms to the growing particles of diamond and predominantly growth of diamond in the kinetic regime under conditions of its thermodynamic metastability. Practical value. Using the obtained results will allow to develop methods and modes of obtaining ultradispersed diamonds for the needs of modern technology.References
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