Abstract
Tantalum oxide-based coatings have recently become potential candidates for high-temperature tribological applications due to their high thermal stability and ionic potential. This study focuses on developing suspension plasma sprayed (SPS) tantalum oxide coatings and evaluating their tribological behavior at elevated temperatures. The coating morphology, oxide phases, and mechanical properties were characterized using Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and microhardness. Microstructural observations showed uniform and dense nanostructure coatings with no phase transformation after deposition. The tribological results illustrated that the friction coefficient of the tantalum oxide coating slightly decreased from 0.9 at 25 °C to 0.8 at 300 °C. On the other hand, the wear rate at 300 °C decreased by >50 % compared to 25 °C. Ex-situ analysis indicated the brittle-fracture behavior of the coating during sliding at 25 °C, which resulted in higher friction and wear. However, the friction and wear decreased at 300 °C, which was attributed to the formation of a smeared or continuous smooth layer on the wear tracks with a stable transfer film on the counterface.
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