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Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/35393
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2 результатів
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Документ Nanostructured ZrO₂ ceramic PVD coatings on Nd-Fe-B permanent magnets(Collegium Basilea, 2019) Taran, Anton; Garkusha, Igor; Taran, Valerij; Timoshenko, Alexander; Misiruk, Ivan; Starikov, Vadym; Baturin, Alexey; Skoblo, Tamara; Romaniuk, Svetlana; Mamalis, Athanasios G.The results of vacuum-arc deposition (PVD) of thin ZrO2 coatings to protect the surface of Nd-Fe-B permanent magnets used as repelling devices in orthodontics are presented. Magnetic devices are offered as an optimum and biologically safe forcegenerating system for orthodontic tooth movement. The structure, phase composition and mechanical properties of zirconium oxide films have been investigated by means of SEM, XRD, EDX, XRF and nanoindentation methods. The coatings are formed 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 quasiphysiological 0.9% NaCl solution has been studied. Electrochemical measurements indicated good barrier properties of the coating on specimens in the physiological solution environment.Документ Structure and properties of nanostructured ZrN coatings obtained by vacuum-arc evaporation using RF discharge(Collegium Basilea, 2018) Taran, Anton; Garkusha, Igor; Taran, Valerij; Muratov, Renat; Starikov, Vadym; Baturin, Alexey; Skoblo, Tamara; Romaniuk, Svetlana; Mamalis, Athanasios G.Nanostructured films of zirconium nitride have been synthesized using an ion plasma vacuum-arc deposition technique in combination with a high-frequency (RF) discharge on AISI 430 stainless steel at 150 °C. Structural examination using X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM) with microanalysis (EDX), transmission electron microscopy (TEM), and nanoidentation was undertaken to reveal phase and chemical composition, surface morphology, microstructure and nanohardness of the coatings. The developed technology provided low-temperature film synthesis, minimized discharge breakdown decreasing formation of macroparticles (MPs) and allowed to deposit ZrN coatings with hardness variation 26.6–31.5 GPa and enhanced corrosion resistance characteristics. It was revealed that ZrN single-phase coatings of cubic modification with fine-crystalline grains of 20 nm in size were formed. The corrosion resistance of coatings has been tested in 0.9% quasiphysiological NaCl solution.