Structure and Mechanical Characteristics of Ti2AlC MAX Phase Cathodes and Deposited Ion-Plasma Coatings

Authors M.A. Bortnitskaya1, E.N. Reshetnyak1, A.S. Kuprin1, T.A. Prikhna2, V.B. Sverdun2, I.V. Kolodiy1, V.A. Belous1, V.G. Marinin1, T.B. Serbenyuk2

1 National Science Center “Kharkiv Institute of Physics and Technology”, 1, Akademichna St., 61108 Kharkiv, Ukraine

2 V.N. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine, 2, Avtozavods'ka St., 04074 Kyiv, Ukraine

Issue Volume 13, Year 2021, Number 5
Dates Received 26 August 2021; revised manuscript received 20 October 2021; published online 25 October 2021
Citation M.A. Bortnitskaya, E.N. Reshetnyak, et al., J. Nano- Electron. Phys. 13 No 5, 05031 (2021)
PACS Number(s) 52.80.Vp, 52.77.Bn, 62.20.Qp
Keywords MAX phase, Coatings (10) , Vacuum-arc deposition (4) , Ion sputtering, Nanoindentation, Cavitation wear.

In this work, the characteristics of the structure, hardness, elasticity, and cavitation resistance of the material of Ti2AlC MAX phase cathodes manufactured by hot pressing, as well as ion-plasma coatings deposited using these cathodes on titanium alloy Ti6Al4V, have been studied. It was found that the cathode material, which contains 83 wt. % MAX phase Ti2AlC, is characterized by a hardness of 10 GPa, a H/E value of 0.04, and low cavitation resistance. The average cavitation wear of the cathode is 4 times higher than that of the titanium alloy Ti6Al4V. It was found that the elemental and phase composition of the obtained coatings differs from the composition of the cathode. The main phase in the coatings is nanocrystalline carbide (Ti, Al) C with a cubic structure of the NaCl type. Ti0.58Al0.17C0.25 coatings deposited by ion sputtering using an arc gas plasma source are characterized by a hardness of 21 GPa. The hardness of vacuum-arc coating Ti0.65Al0.07C0.28 is closer to the hardness of the cathode – 13 GPa, which is due to the presence of α-Ti in its composition. The H/E ratio of the coatings is 1.5 times higher than that of the cathode, which is a prerequisite for high cavitation resistance. The average rate of cavitation wear of vacuum arc coating Ti0.65Al0.07C0.28 is 1.5 times lower than that of the vacuum arc coating TiN and 3 times lower than that of the uncoated Ti6Al4V alloy.

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