investigation of friction for nanocoated and uncoated ti-6al-4v substrates via the modified pin-on-disk technique for transfemoral implants

Background: nanocoating of biomedical materials has emerged as a crucial emerging discipline, to enhance tribological behaviors, durability, and performance of materials.objective: this study aimed to investigate the tribological characteristics of substrates coated with hydroxyapatite (hap) and silica glass (sio2).material and methods: in this experimental study, the substrates were ti-6al-4v, a widely used titanium alloy for osseointegration implants. the substrates were coated with 90% hap and 10% sio2 via the plasma cold spray technique. the friction examination was analyzed at room temperature and under the simulated body fluid (sbf) condition using the pin-on-disc technique.results: the microstructural analysis confirmed the coated technique in producing a nano-sized layer. while the pin-on-disc test indicates that nanocoated ti-6al-4v specimens have a significantly higher average coefficient of friction than uncoated specimens, surface roughness is the primary contributor. conclusion: through microstructure properties and tribological behavior, the coated alloy may provide a benefit in circumstances, in which lubrication availability is restricted or undesirable, such as when the implant comes into contact with the bone interface.