A new MAX phases-based electroconductive coating for high-temperature oxidizing environment. (1st December 2021)

• Record Type: Journal Article
• Authors: Prikhna, T.A.; Ostash, O.P.; Kuprin, A.S.; Podhurska, V.Ya.; Serbenyuk, T.B.; Gevorkyan, E.S.; Rucki, M.; Zurowski, W.; Kucharczyk, W.; Sverdun, V.B.; Karpets, M.V.; Ponomaryov, S.S.; Vasyliv, B.D.; Moshchil, V.E.; Bortnitskaya, M.A.
• Is Part Of: Composite structures. Volume 277(2021)
• Publication Date: 2021-12-01
• Subjects: Ti-Al-C materials -- Vacuum-arc deposition -- Oxidation resistance -- Electrical conductivity -- Local chemical composition -- Phase composition; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2021.114649
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: In the paper, results of variations of structure, oxidation resistance, and electrical conductivity of novel MAX-phase composite coating are presented. The characteristics of highly dense Ti-Al-C composite bulks and vacuum-arc deposited 6 μm thick coatings before and after heating at 600 °C in air for 1000 h were compared. High electrical conductivity (σ = 1.3·10 6 S/m) of the highly resistant toward oxidation (Δm/S = 0.07 mg/cm 2 ) Ti-Al-C coating was preserved after long-term heating in air. It was found that the specimen surface layers of MAX-phases Ti3 AlC2 and Ti2 AlC based bulks and chromium-containing Crofer 22APU steel became semiconductors because of high-temperature long-term oxidation (at 600 °C). The vacuum-arc deposited Ti-Al-C composite coating revealed high oxidation resistance and electrical conductivity along with good mechanical characteristics, namely nanohardness H (10 mN) = 9.5 ± 1.5 GPa, and Young's modulus E = 190 ± 10 GPa, which make it very promising for interconnects of solid oxide fuel cells (SOFCs).