Fretting Wear Characteristics of Plasma-Sprayed CNT-Reinforced Wollastonite-Zirconia Composite Coatings
Year: 2025
Type: article
Abstract: Poster at conference ECOTRIB 25: This work explores the fretting wear behavior of plasma-sprayed wollastonite-zirconia (WaZr) composite coatings, with and without carbon nanotube (CNT) reinforcement, for bioimplant applications. Comparative analysis was conducted with conventional hydroxyapatite (HA) coatings deposited on titanium substrates. Microstructural observations revealed that the addition of CNT results in a denser, more uniformly bonded WaZr-CNT coating by enhancing splat bridging and reducing porosity. Mechanical testing indicated higher hardness and lower elastic modulus for WaZr-CNT compared to unreinforced WaZr coatings. Under fretting wear testing at a 200 µm displacement amplitude, the WaZr-CNT coating showed a remarkable reduction in energy dissipation, 83% lower than HA and 75% lower than WaZr coatings, demonstrated that, while HA and WaZr coatings suffered splat fracture and generated a substantial amount of wear debris, the WaZr-CNT coating exhibited minimal debris formation and preserved splat boundaries. This study introduces CNT-reinforced WaZr coatings as a promising solution for enhancing fretting wear resistance in cyclic sliding contacts, relative to unreinforced WaZr and traditional HA coatings.
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7203605802