Facile hydrothermal synthesis of TiO2-CaP nano-films on Ti6Al4V alloy
(1. Key Laboratory of Biomedical Information Engineering of Ministry of Education,
School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China;
2. School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China;
3. State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research,
Xi’an 710016, China)
School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China;
2. School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China;
3. State Key Laboratory of Porous Metal Materials, Northwest Institute for Nonferrous Metal Research,
Xi’an 710016, China)
Abstract: Ti6Al4V alloy was subjected to hydrothermal treatment in the concentrated Ca3(PO4)2, CaHPO4 and Ca(H2PO4)2 solutions for bioactive surface modification. The treated samples are covered by films composed of nano-particles with the size of 60-240 nm. Such film can also be grown on the strut surface of a Ti6Al4V scaffold prepared by electron beam melting (EBM) technology. XPS analysis indicates that Ti element on the surface presents as TiO2, and Ca and P elements are in the form of calcium phosphate. XRD and Raman analyses show that the surface layer is composed of anatase TiO2 and hydroxyapatite. Potentiodynamic polarization test in a Ca-free Hank’s balanced solution demonstrates that the treated sample has markedly improved corrosion resistance compared with the polished sample. The present work provides a bioactive surface modification method that is easily-operated, low-temperature, less corrosion, and applicable to porous Ti6Al4V alloy for biomedical applications.
Key words: titanium; TiO2; calcium phosphate; hydrothermal treatment; corrosion