Bondar O. Structure and physical-mechanical properties of multielement and multilayer nanostructured coatings

The dissertation is devoted to the establishment of general laws and mechanisms of formation of multielement (NbN, NbSiN, NbAlN, (TiZrAlYNb)N, (TiZrHfVNb)N and (TiZrHfVNbTa)N) and multilayer ([TiN/MoN]n/Sub, [TiN/ZrN]n/Sub, [MoN/CrN]n/Sub and [TiN/SiC]n/Sub) nanostructured coatings, determination of the influence of energy and thermodynamic deposition parameters on their structural-phase state and physical-mechanical properties. The obtained results of complex studies supply and extend the modern ideas about the physical foundations of the formation of the structure, microstructure, physical-mechanical and tribological properties of multi-element and multilayer nanostructured coatings based on nitrides ofrefractory and transition metals deposited by vacuum-arc evaporation or magnetron sputtering. Most of all, it concerns the influence of deposition parameters, such as reactive nitrogen atmosphere pressure, bias potential, substrate temperature, bilayer thickness. The obtained experimental data, supplemented by the results of the principle-principles molecular dynamics calculations, contribute to the further development of theoretical ideas about the formation of multielement and multilayer nitride coatings with controlled properties. Investigation of the influence of thermal annealing and high dose ion implantation on the structure-phase state and physical-mechanical properties of the coatings allow deeper understanding of the physical processes occurring in the coatings due to the action of the mentioned processes.