Corrosion and tribocorrosion behavior of Ti–B4C composite intended for orthopaedic implants

Effect of HAP decomposition on the corrosion behavior of Ti–HAP biocomposites

“…It has been reported for metal matrix composites (MMCs) that discontinuities between matrix and the reinforcement may cause formation of locally activated sites . Even so, Ti–5HAP composite samples presented slightly higher E ( i = 0) values as compared to the unreinforced samples, which can be attributed to the reduced exposed metallic area due to the presence of the ceramic phases, that had also been reported in the literature for several MMCs that can result in a shift on the corrosion potential values to more noble values . In order to have a further understanding of the locally activated sites on the composite samples, EIS studies were performed.…”

“…Nevertheless, the biggest difference on the electrochemical response between Ti and Ti–5HAP samples was caused by the HAP‐depleted zones on the composite. First, the pores formed after HAP decomposition led to obtain an additional electrolyte resistance on these zones . More importantly, as represented on the EEC (Figure b) by the R ct / Q dl couple, local active areas were characterized on the HAP‐depleted zones.…”

Preliminary investigation on the tribocorrosion behaviour of nanotubular structured Ti6Al4V surfaces

“…After a run-in period (approx. 1 min), these surfaces presented a recovery on the potential values till the end of sliding that can be related with the formation of a compacted wear debris providing a limited protection [13]. AT samples presented less wear damage, together with lower cathodic shift on OCP and lower COF during sliding that may be linked to the improved load bearing ability of the nanotubular oxide layers, and their effect on reducing COF [12,14].…”

Microstructure evolution and phase transformation of TiB2/SiC/B4C composites synthesized from Ti‐SiC‐B4C ternary system

“…Generally, there is a potential in‐situ reaction process between Ti and B 4 C to form TiC, TiB and TiB 2. In addition, the reactive products between B 4 C and Ti can lead to a strong bonding between metal and ceramic phase . Owing to higher modulus and hardness of TiB 2 compared to TiB, the completed reaction between Ti and B 4 C is beneficial to improve mechanical performance .…”

“…17 In addition, the reactive products between B 4 C and Ti can lead to a strong bonding between metal and ceramic phase. 18 Owing to higher modulus and hardness of TiB 2 compared to TiB, the completed reaction between Ti and B 4 C is beneficial to improve mechanical performance. 19 Nevertheless, there is no evident proof indicating the reaction between Ti and SiC, so their combination can be treated as physical bond.…”