Technology, energy, agriculture transport AIC

Gaidamak Oleg Leonidovich – Candidate of Science (Engineering), Associate Professor, Associate Professor of the Department of Power engineering, electrical engineering and electromechanics of Vinnitsa National Agrarian University .

The article shows the results of the study of the velocity of the sprayed powder particles on the example of cold gas-dynamic spraying of copper powder C01-11. Features and advantages of gas-dynamic spraying before other gas-thermal coating methods are given. The importance of the speed regime of coating and its influence on the formation of the coating is analyzed. A computational experimental method for determining the velocity of sprayed particles is proposed, as well as an experimental setup with the help of which it is possible to obtain objective data on the velocity regime of cold gas-dynamic coating. The design of the applied gas-dynamic spraying device is shown, which contains an electric heater of the compressed air flow and an accelerator of the heated compressed air into which the sprayed metal powder is driven due to the ejection effect. An experimental setup was used for the study, which contained two rotating disks mounted at a distance of 20 mm from each other on the shaft of a high-speed electric motor, with holes in the upper disk through which spraying occurs on the surface of the lower disk. Due to the fact that the disks with the spraying process rotate at a speed of 10587 rpm is the displacement of the sputtering figure on the lower disk relative to the projection of the hole of the upper disk on the lower disk. The magnitude of this displacement is calculated by the velocity of the particles of the sprayed powder, according to the above method. The parameters that are taken into account when calculating the speed of the spray particles of the powder is the diameter of the nozzle of the spray device 5 mm. The distance from the nozzle cut to the upper disk is 10 mm. The distance from the nozzle cut to the lower disk is 32 mm. The distance between the disks a = 22 mm. The radius on which the nozzle of the spray device is installed is 90 mm.
As a result of the experiments, it was found that when spraying copper powder C01-11 at a temperature of 20 ºC, the spraying speed is 232.2 m / s, which does not provide conditions for coating, and at elevated temperatures to 285 ºC quality coating was formed. The spraying speed was from 302.7 to 359.2 m / s for critical sections of 2.5 and 3.01 mm2, and the spraying area at higher speeds was approximately 20% higher than at lower speeds. This makes it possible for researchers to determine the velocity modes of spraying and, accordingly, to more accurately assign the optimal technological parameters to achieve the highest quality results of creating functional coatings.

[1]    Alkhimov, A. P., Klinkov, S. V., Kosarev, V. F. (2010). Holodnoe gazodinamicheskoe napilenie. Teoriya I praktika. [Cold gas-dynamic spraying. Theory and practice]. Moscow: Fizmatlit. [in Russian].
[2]    Bondarenko, M. P., Guliaev, I. P., Guliaev, P. Y. (2013). Metodi kontrolia temperfturi i skorosti chastits kondensirovanoy fazi v protsese plazmenno-dugovogo napilenia [Methods for controlling the temperature and velocity of particles of the condensed phase in the process of plasma-arc sputtering]. FUNDAMENTAL RESEARCH, 10, 1194–1199. [ in Russian].
[3]     Device for gas-dynamic coating with radial flow of powder material: Pat. 110552 Ukraine, IPC6 С23С24 / 00 № а 201405543; claimed 05/23/14; publ. 01/12/16, Bul. №1. 12 sec. [in Ukrainian].
[4]    Papyrin, A.,  Kosarev V.,  Klinkov S. (2007). Cold spray technology.  Elsevier Science. [in English].
[5]    The cold spray materials deposition process. (2007). Fundamentals and applications.  Cambridge. Woodhead Publishing Ltd. [in English].
[6]    Maev, R., Leshchynsky, V. (2008). Introduction to low pressure gas dynamic spray: Physics & Technology. Weinheim: Wiley-VCH. [in English].
[7]    Klinkov, S.V., Kosarev, V.F., Sova, A.A. (2006). Issledovanie  inzshektornoy shemi formirovfniya geterogennih sverhzvukovih potokov v usloviyah holodnogo gzodinamicheskogo napileniya [Investigation of the ejector scheme for the formation of heterogeneous supersonic flows under conditions of cold gas-dynamic spraying]. Thermophysics and aeromechanics. 13(3), 386–397 [in Russian].
[8]    Gaidamak, O. L, Savulyak, V.I. (2018). Eksperementalne doslidzshenna prozesu holodnogo gazodinamichnogo nanesenia pokrittia ta metodika rozrahynku yogo rezshimiv/ [Experimental study of the process of cold gas-dynamic coating and methods for calculating its modes]. Bulletin of the Vinnytsia Polytechnic Institute. 4 (14). 88–94 [in Ukrainian].