Перегляд за Автор "Taran, V. S."
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Документ Alloying and modification of materials relevant to fusion and fission energy(Publications Office of the European Union, 2017) Makhlai, V. A.; Garkusha, I. E.; Byrka, O. V.; Taran, V. S.; Herashchenko, S. S.; Malykhin, S. V.Документ Anti-corrosion ceramic coatings on the surface of Nd-Fe-B repelling magnets(National Science Center "Kharkov Institute of Physics and Technology", 2019) Taran, A. V.; Garkusha, I. E.; Taran, V. S.; Timoshenko, O. I.; Misiruk, I. O.; Skoblo, T. S.; Romaniuk, S. P.; Starikov, V. V.; Baturin, A. A.; Nikolaychuk, G. P.; Pyvovar, N. V.; Gnidenko, Yu. P.The results of vacuum-arc deposition of thin ZrO₂coatings to protect the surface of Nd-Fe-B permanent magnets used as repelling devices in orthodontics are presented. The structure, phase composition and mechanical properties of zirconium dioxide films have been investigated by means of SEM, XRD, EDX, XRF and nanoindentation method. It was revealed the formation of polycrystalline ZrO₂ films of monoclinic modification with average grain size 25 nm. The influence of the ZrO₂ coating in terms of its barrier properties for corrosion in quasi-physiological 0.9 NaCl solution has been studied. Electrochemical measurements indicated good barrier properties of the coating on specimens in the physiological solution environment.Документ Damage features of tungsten and tungsten coatings exposed to QSPA powerful plasma streams in ITER-like conditions(Pontificia Università Urbaniana, Italy, 2016) Makhlai, V. A.; Aksenov, N. N.; Byrka, O. V.; Garkusha, I. E.; Herashchenko, S. S.; Linke, J.; Malykhin, S. V.; Surovitskiy, S. V.; Taran, V. S.; Wirtz, M.Документ Materials surface damage and modification under high power plasma exposures(2018) Garkusha, I. E.; Makhlaj, V. A.; Byrka, O. V.; Taran, V. S.; Voitsenya, V.; Malykhin, S. V.; Herashchenko, S. S.; Surovitskiy, S. V.; Nowakowska-Langier, K.; Sadowski, M. J.; Skladnik-Sadowska, E.; Terentyev, D.Influence of powerful plasma impacts on several materials used for the construction of energy systems, i.e. different grades of steels as well as tungsten coatings, has been discussed. Irradiations of these materials with hydrogen and helium plasma streams have been performed in several high-current-pulse and quasi-stationary plasma accelerators which provided the variation of a power load upon the exposed surface as well as changes of the particle flux in wide ranges: the energy flux density in the range of 1-25 MJ/m2, particle flux - up to 1026-1029 ion/m2s, the plasma stream velocity - up to about 500 km/s, and the pulse duration in the range of 1-250 μs. A response of the investigated materials to extreme plasma loads, which are relevant to transient events in fusion reactors, is briefly discussed. It is demonstrated that a broad combination of mechanisms of powerful plasma interactions with various materials includes not only a surface damage caused by different erosion mechanisms, but under certain conditions it may also result in a significant improvement of material properties in the nearsurface surface layer of several tens μm in thickness. Some improvement of the structure and substructure of such a layer may be caused by the high-speed quenching, the shock wave formation and material alloying with plasma- and coating-species. The creation of unique surface structures and a considerable improvement of physical and mechanical properties of different materials can be achieved by the pulsed plasma alloying, i.e. pre-deposited coating modifications and mixing caused by the impacting plasma streams.Документ Modification, alloying and sputtering tests of Cr18Ni10Ti and EUROFER steels(Institute of Energy and Climate Research - Plasma Physics, 2017) Makhlai, V. A.; Garkusha, I. E.; Taran, V. S.; Voitsenya, V.; Herashchenko, S. S.; Aksenov, N. N.; Byrka, O. V.; Solyakov, D.; Solodovchenko, S.; Malykhin, S. V.; Surovitskiy, S. V.; Terentyev, D.Документ Synthesis and characterisation of nanocrystalline ZrN PVD coatings on AISI 430 stainless steel(National Science Center "Kharkov Institute of Physics and Technology", 2019) Taran, A. V.; Garkusha, I. E.; Taran, V. S.; Muratov, R. M.; Skoblo, T. S.; Romaniuk, S. P.; Starikov, V. V.; Baturin, A. A.The nanocrystalline films of zirconium nitride have been synthesized using ion-plasma vacuum-arc deposition technique in combination with high-frequency discharge (RF) on AISI 430 stainless steel at 150oC. Structure examinations X-ray fluorescent analysis (XRF), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) with microanalysis (EDS), and transmission electron microscopy (TEM), nanoidentation method – were performed to study phase and chemical composition, surface morphology, microstructure and nanohardness of coatings. The developed technology provided low-temperature coatings synthesis, minimized discharge breakdown decreasing formation of macroparticles (MPs) and allowed to deposit ZrN coatings with hardness variation 26.6…31.5 GPa. It was revealed that ZrN single-phase coatings of cubic modification with finecrystalline grains of 20 nm in size were formed.