Microstructural Analysis And Tribological Characteristics Of Thermally Sprayed Co-Ni-O Ternary Oxide Coatings

Due to their high thermal and chemical stability, ternary oxide coatings have been extensively investigated as potential solutions for high-temperature solid lubrication. In this study, the tribological behavior of the thermally sprayed Co0.75Ni0.25O and Co0.5Ni0.5O oxide coatings was investigated. The dry sliding reciprocating friction tests were performed against an Al2O3 counterface at room and elevated temperatures using a ball-on-flat tribometer. The results indicated that the friction and wear of Co0.75Ni0.25O oxide coatings did not change significantly at atmospheric and elevated temperature conditions, whereas the friction and wear of the Co0.5Ni0.5O increased at elevated temperatures. The correlations between the worn surface morphologies, the subsurface microstructure induced by wear, and the wear behavior of the coatings were discussed based on the characterizations, (i.e., microhardness, scanning electron microscopy (SEM), and electron channeling contrast imaging (ECCI)).

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Originally published at Journal of the European Ceramic Society (Volume 45, Issue 1, January 2025)
By Amit Roy, Vahid Jalilvand, Saeed Mohammadkhani, Payank Patel, A. Dolatabadi, L. Roue, D. Guay, Richard R. Chromik, Pantcho Stoyanov, Christian Moreau