Komir A. Experimental and numerical simulation of properties changes in the carbon materials under the influence of an oxidizing medium and ionizing radiation

Oxidation and abrasion of nuclear graphite were carried out on an electron accelerator, which provides a beam of 2.5 MeV and a beam current up to 1000 μA. As nuclear materials, graphite brands ARV, MPG, GSP were used. It has been experimentally determined that in the presence of ionizing radiation, at high temperatures and in the oxidizing medium, the rate of abrasion of investigated reactor graphites increases at times. It has been shown experimentally that as a result of the simultaneous influence of high temperatures, oxidizing media and ionizing radiation on the grades of reactor graphs GSP and ARV there is an increase in the perfection of the crystallographic structure of graphite ARV grade. The simulation model of nuclear-pure graphite oxidation, taking into account porosity, fractionation, density, oxidant diffusion, motion of the near-surface oxidant layer. The interactions of the simulation levels for the oxidation description in the mode of chemical kinetics in the temperature range 400-800°С, was developed. This model allows to reconstruct the internal structure of porous materials with internal order based on two-dimensional images. This allows model more precisely the physical processes occurring in porous materials, which is very essential for the simulation of the heterogeneous influence of the material of such processes as oxidation.