Nano- and micro-tribological behaviours of plasma nitrided Ti6Al4V alloys

An Overview on the Tribological Performance of Titanium Alloys with Surface Modifications for Biomedical Applications

“…The average COF for plasma nitrided Ti alloy was reduced to 0.23 which was 0.35 before treatment. The wear rate at 15 N load was 7.66 × 10 −12 m 3 /Nm of plasma treated alloy and 1.27 × 10 −11 m 3 /Nm of the untreated one [63]. Based on a study on hydrothermal treatments [59], the polished Ti-6Al-4V surfaces were treated in urea solution with or without subsequent heating at 400 °C for 1 h. It reduced the surface roughness because of the formation of anatase TiO2 and increased the Vickers hardness with the increase in urea concentration from 0.5 M to 3 M as shown in Figure 1.…”

“…Plasma nitriding of Ti-6Al-4V alloy as the other coating method was carried out in a plasma reactor with a hot wall vacuum chamber. The results showed that the wear rate of plasma nitrided Ti alloy was about 99% lower than that of the untreated Ti alloy [63].…”

“…The average COF for plasma nitrided Ti alloy was reduced to 0.23 which was 0.35 before treatment. The wear rate at 15 N load was 7.66 × 10 −12 m 3 /Nm of plasma treated alloy and 1.27 × 10 −11 m 3 /Nm of the untreated one [63]. Datta et al [60] studied cathodic arc deposit TiN coatings on Ti-6Al-4V alloy.…”

“…Miller et al [75] reported that galling occurs on the bare titanium and it stops working when it is in sliding contact with itself and most other metals. Rigney et al [76] reported that the abrasive In another study [63], the direct laser nitriding was applied on commercially pure titanium and also Ti-6Al-4V alloy in an open atmosphere using continuous-wave (CW) fiber laser. Investigation of friction and wear rate in fetal bovine serum (FBS) associated with pin-on-disk test results showed that the mass loss in the treated pure titanium pair (0.02 mg) and Ti alloy pair (0.06 mg) was lower than that of in the untreated pure titanium (34.14 mg) and Ti alloy pairs (9.23 mg) [66].…”

“…The coefficients of friction (COF) as a function of scratch length for: (a) Ti-6Al-4V alloy (TA), and (b) plasma nitrided Ti-6Al-4V alloy (TAPN); under different loads[63].…”