Influence of Cr, Ti and Zr Oxides Formation on High Temperature Sliding of NiAl-Based Plasma Spray Coatings

Abstract:

In this study, the tribological characteristics of plasma thermal spray coatings are studied with particular interest on formation and performance of Cr, Ti and Zr oxides under dry sliding at 500 °С with Pin-On-Disc configuration against NiAl. Plain Cr₂O₃, TiO₂ and ZrO₂ coatings were tested to trace the difference between performance of original and in-situ formed oxides. Friction surfaces were examined using SEM and X-ray spectral analyses. The highest wear resistance of NiAl-CrB₂ composite coatings can be related to the formation of Cr₂O₃ during the tribosynthesis process.

• Periodical: Key Engineering Materials (Volume 674)
• Pages: 308-312
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.674.308
• Online since: January 2016
• Authors: Olena Poliarus*, Oleksandr Umanskyi, Maksym Ukrainets, Oleksii Kostenko, Maksim Antonov, Irina Hussainova
• Keywords: Composite Materials, Diborides, Intermetallic, Oxides, Plasma Coatings, Tribological Tests, Wear Resistance

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