Heat Resistance, High-Temperature Tribological Characteristics, and Electrochemical Behavior of Arc-PVD Nanostructural Multilayer Ti–Al–Si–N Coatings

• Published in: Protection of metals and physical chemistry of surfaces 2018-05, Vol.54 (3), p.416-424
• Main Authors: Blinkov, I. V., Belov, D. S., Volkhonsky, A. O., Sergevnin, V. S., Nizamova, A. N., Chernogor, A. V., Kiryukhantsev-Korneev, F. V.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials and Coatings; Materials Science; Metallic Materials; New Substances; Tribology
• ISSN: 2070-2051; 2070-206X
• DOI: 10.1134/S2070205118030048

The present paper has aimed at studying heat resistance, electrochemical behavior, and tribological characteristics at high temperatures of superhard (~48 ± 2 GPa), multilayered with a modulation period of 17–18 nm, and nanostructured (nc)AlN-(am)Si 3 N 4 /(nc)TiN coatings obtained with an ion-plasma vacuum arc. The heat resistance of the coatings studied in the temperature range of up to 800°C inclusive was mainly determined by the oxidation of their surface layers without the substrate intrusion. Having a high coefficient of friction from 0.6 at 20°C to 0.8–0.85 at elevated temperatures, the coatings are characterized by virtually no wear, which was confirmed by profilometry measurements of friction zones. The obtained results concerning electrochemical behavior indicate that the Ti–Al–Si–N coatings are highly efficient in the protection of a cutting tool from corrosion in both acidic and alkaline media.