Issues »  Volume 41, Issue 8

Synthesis of Composite Coatings by Ultrasonic Impact Treatment of VT6 Titanium Alloy

B. M. Mordyuk$^{1}$, S. M. Voloshko$^{2}$, A. P. Burmak$^{2}$, V. V. Mohylko$^{2}$, M. M. Voron$^{3}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$National Technical University of Ukraine ‘Igor Sikorsky Kyiv Polytechnic Institute’, 37 Peremohy Ave., UA-03056 Kyiv, Ukraine
$^{3}$Physico-Technological Institute of Metals and Alloys, NAS of Ukraine, 34/1 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 02.10.2018; final version - 12.05.2019. Download: PDF

Modification of the surface layer of VT6 titanium alloy by ultrasonic impact treatment (UIT) with addition of $\alpha$-Si$_3$N$_4$, $\beta$-Si$_3$N$_4$ and Al$_2$O$_3$ powders in the deformation zone is performed. As shown by means of X-ray phase analysis and scanning electron microscopy, the surface layers of composite are formed during severe plastic deformation induced by UIT. High-temperature oxidation of composite layers leads to the formation of continuous coatings. As shown by the gravimetric analysis of samples during the cyclic high-temperature oxidation in the air (20 cycles for 5 hours at a temperature of 650°C), the heat resistance of the modified surface of titanium alloy VT6 is increased. The highest heat resistance is observed for composite coating contained $\beta$-Si$_3$N$_4$ particles. The UIT-synthesis of composite layers/coatings increases corrosion resistance of VT6 alloy in 3.5% NaCl aqueous solution and its wear resistance at dry friction. The highest rates are registered for composite coating contained Al$_2$O$_3$ particles.

Key words: ultrasonic impact treatment, composite layers, oxide/nitride powders, coating, heat resistance, corrosion, wear resistance.

URL: http://mfint.imp.kiev.ua/en/abstract/v41/i08/1067.html

DOI: https://doi.org/10.15407/mfint.41.08.1067

PACS: 62.20.Qp, 68.55.J-, 68.55.Nq, 68.60.Bs, 81.05.Ni, 81.40.Ef, 81.40.Pq, 81.65.-b

Citation: B. M. Mordyuk, S. M. Voloshko, A. P. Burmak, V. V. Mohylko, and M. M. Voron, Synthesis of Composite Coatings by Ultrasonic Impact Treatment of VT6 Titanium Alloy, Metallofiz. Noveishie Tekhnol., 41, No. 8: 1067—1086 (2019) (in Ukrainian)

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