Перегляд за Автор "Markovich, S. E."
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Документ Computational fluid dynamics modeling of a low pressure cold spraying nozzle(НТУ "ХПІ", 2014) Canales, H.; Lytvynov, A. A.; Markovich, S. E.; Dolmatov, A. I.The fluid dynamics design and optimization is one of the most important tasks in order to improve the Cold Spraying process. In the present study the Computational Fluid Dynamics methodology is applied in order to study the fluid dynamic characteristics of the supersonic airflow through the SK-20 Low Pressure Cold Spraying nozzle attached to a Dymet 405 Cold spraying system. A particle study was performed in order to determine the particle velocity and temperature of several powder materials commercially available. In order to validate the calculations, the results from the Computational Fluid Dynamics methodology are corroborated with experimentation using a supersonic pitot tube that measures the static and dynamic pressure from which Mach number at the exhaust of the nozzle is determined. In this study, it is found that the experimental data agrees well with the results obtained from the Computational Fluid Dynamics methodology.Документ Study of low pressure cold sprayed Al+Al₂O₃+Zn coatings and the influence of the spraying parameters in coating properties(НТУ "ХПІ", 2014) Canales, H.; Zolfaguari, M. R.; Markovich, S. E.; Dolmatov, A. I.Low Pressure Cold Spraying (LPCS) is a thermal spraying technique for applying highdensity coatings on almost any surface. The main features of the LPCS is that Air is used for the powder materials acceleration through a DeLaval Nozzle with a maximum operation temperature of 630 C in a pressure range of 5 to 9 atm. The powders used in LPCS are usually MMC (Metal Matrix Composite) blends using Alumina very often as the Ceramic part of the composition. The aim of this study is to investigate the effect of the stagnation spraying temperature on the coating properties produced with the Dymet 405 Low Pressure Cold Spraying system and Al+Al₂O₃+Zn powder blend. The coatings are submitted to analyses using a SEM microscope, Micro-Hardness testing and Adhesion-Cohesion measurements.