Improving the fretting biocorrosion of Ti6Al4V alloy bone screw by decorating structure optimised TiO2 nanotubes layer
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第14期
论文作者：Jiajun Luo Maryam Tamaddon Changyou Yan Shuanhong Ma Xiaolong Wang Feng Zhou Chaozong Liu
文章页码：47 - 55
摘 要：Ti O2 nanotubes（NT） has been demonstrated its potential in orthopaedic applications due to its enhanced surface wettability and bio-osteointegration. However, the fretting biocorrosion is the main concern that limited its successfully application in orthopaedic application. In this study, a structure optimised thin Ti O2 nanotube（SONT） layer was successfully created on Ti6 Al4 V bone screw, and its fretting corrosion performance was investigated and compared to the pristine Ti6 Al4 V bone screws and NT decorated screw in a bone-screw fretting simulation rig. The results have shown that the debonding Ti O2 nanotube from the bone screw reduced significantly, as a result of structure optimisation. The SONT layer also exhibited enhanced bio-corrosion resistance compared pristine bone screw and conventionally NT modified bone screw. It is postulated that interfacial layer between Ti O2 nanotube and Ti6 Al4 V substrate, generated during structure optimisation process, enhanced bonding of Ti O2 nanotube layer to the Ti6 Al4 V bone screws that leading to the improvement in fretting corrosion resistance. The results highlighted the potential SONT in orthopaedic application as bone fracture fixation devices.
Jiajun Luo1，Maryam Tamaddon1，Changyou Yan2，Shuanhong Ma2，Xiaolong Wang2，Feng Zhou2，Chaozong Liu1
1. Institute of Orthopaedic & Musculoskeletal Science, Division of Surgery & Interventional Science, University College London, Royal National Orthopaedic Hospital2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences
摘 要：Ti O2 nanotubes（NT） has been demonstrated its potential in orthopaedic applications due to its enhanced surface wettability and bio-osteointegration. However, the fretting biocorrosion is the main concern that limited its successfully application in orthopaedic application. In this study, a structure optimised thin Ti O2 nanotube（SONT） layer was successfully created on Ti6 Al4 V bone screw, and its fretting corrosion performance was investigated and compared to the pristine Ti6 Al4 V bone screws and NT decorated screw in a bone-screw fretting simulation rig. The results have shown that the debonding Ti O2 nanotube from the bone screw reduced significantly, as a result of structure optimisation. The SONT layer also exhibited enhanced bio-corrosion resistance compared pristine bone screw and conventionally NT modified bone screw. It is postulated that interfacial layer between Ti O2 nanotube and Ti6 Al4 V substrate, generated during structure optimisation process, enhanced bonding of Ti O2 nanotube layer to the Ti6 Al4 V bone screws that leading to the improvement in fretting corrosion resistance. The results highlighted the potential SONT in orthopaedic application as bone fracture fixation devices.
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