Layered Structure of CoCrAlY/ZrSiO4/Al2O3 Coatings Before and After Thermal Treatment

Authors M.G. Kovaleva1 , V.V. Sirota2 , V.M. Beresnev3 , Yu.N. Tyurin4, O.N. Vagina1, I.A. Pavlenko1

1Belgorod National Research University, 85, Pobedy St., 308015 Belgorod, Russia

2Belgorod State Technological University named after V.G. Shoukhov, 46, Kostyukov St., 308012 Belgorod, Russia

3V.N. Karazin Kharkiv National University, 4, Svobody Sq., 61000 Kharkiv, Ukraine

4E.O. Paton Electric Welding Institute, NASU, 11, Bozhenko St., 03650 Kyiv, Ukraine

Issue Volume 11, Year 2019, Number 6
Dates Received 27 September 2019; revised manuscript received 02 December 2019; published online 13 December 2019
Citation M.G. Kovaleva, V.V. Sirota, V.M. Beresnev, et al., J. Nano- Electron. Phys. 11 No 6, 06025 (2019)
PACS Number(s) 68.37.Hk, 68.37.Yz, 62.20.Qp
Keywords Microstructure (21) , Microhardness (2) , Multi-chamber gas-dynamic accelerator (2) , Nickel alloys, Thermal barrier coatings.

In work, dense CoCrAlY/ZrSiO4/Al2O3 coatings have been prepared on nickel based superalloy substrates by a new multi-chamber gas-dynamic accelerator. The coatings were subjected to thermal treatment in vacuum at a temperature of 950 °C for 2 hours. Scanning microscope with an EDX microprobe was used to analyze the chemical composition. Analysis of structural changes, mainly from the aspect of porosity, was also carried out using an optical microscope. Measurement of the microhardness of coatings was done with a microhardness tester DM-8B using a Vicker’s hardness tester at a test load of 50 g. A positive impact of thermal treatment on the coating microstructure and microhardness was observed. The CoCrAlY/ZrSiO4/Al2O3 coatings after thermal treatment were observed to be continuous, without cracks, and well bonded with the substrate. The absence of discontinuities in the interfaces among the different layers was indicative of good adhesion between them. Thermal treatment resulted in an increase in the coating hardness.

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