Nanocomposites and nanomaterials

Investigation of long-term oxidation resistance of titanium alloy with a Ti,Me-Al-C nanocomposite coating
Podhurska V.Ya.1, Prikhna T.O.2, Ostash O.P.1, Sverdun V.B.2, Kuprin A.S.3, Serbeniuk T.B.2, Bortnitskaya M.А.3
1 Department of Hydrogen Technologies and Alternative Energy Materials, Karpenko Physico-Mechanical Institute of the NAS of Ukraine, 5 Naukova str., Lviv 79060, Ukraine.
E-mail: podhurskavika@gmail.com
2 Department of Sintering Technologies of Ceramics, Institute for Superhard Materials of the NAS of Ukraine, 2 Avtozavodska str., Kyiv 04074, Ukraine. 

3 Laboratory of Ion-Plasma Processing of Materials, National Science Center Kharkiv Institute of Physics and Technology, 1 Akademicheskaya str., Kharkiv 61108, Ukraine.

Nowadays, solid oxide fuel cell (SOFC) interconnects are traditionally made of sheets of Crofer steels [1]. Interconnects made of titanium sheets with coatings based on MAX phases of the Ti–Al–C system can be more efficient [2]. The goal of this work is investigation of the long-term oxidation resistance of titanium alloy OT4-1 with a Ti,Me-Al-C nanocomposite coatings.
Ti,Me-Al-C nanocomposite coatings were deposited on polished samples of the titanium alloy OT4-1 by combine two methods DC magnetron sputtering of Ti2AlC MAX phase target and cathodic arc evaporation of Me (Cr or Mo) cathode. It was shown that ~10 μm thick Ti,Cr-Al-C coatings coating has high mechanical properties (H=14 and E=240 GPa), oxidation resistance at 600 °C in air and provide high electrical conductivity (6.8·105 Sm/m) after 1000 h oxidation. According to the obtained results, a OT4-1 alloy with a coatings can be used for the manufacture of the interconnects for intermediate-temperature fuel cells.

1.	Mikkola J.; Couturier K.;Talic B.; Frangini S.; Giacometti N.; Pelissier N.; Sudireddy B.R.; Thomann O. Protective Coatings for Ferritic Stainless Steel Interconnect Materials in High Temperature Solid Oxide Electrolyser Atmospheres. // Energies.-2022.-15. P. 1168. 
2.	Prikhna T, Ostash O, Kuprin O, Podhurska V et al. A new MAX phases-based electroconductive coating for high-temperature oxidizing environment // Composite Structures.-2021.-277,-P. 114649.