Hydroxyapatite/titania sol-gel coatings on titanium-zirconium alloy for biomedical applications

作者：Wen, C E^*; Xu, W; Hu, W Y; Hodgson, P D

来源：Acta Biomaterialia, 2007, 3(3): 403-410.

DOI：10.1016/j.actbio.2006.10.004

• TiZr alloy
• sol-gel processing
• hydroxyapatite
• titania
• HA/TiO2 coatings

A simple sol-gel method was developed for hydroxyapatite/titania (HA/TiO2) coatings on non-toxic titanium-zirconium (TiZr) alloy for biomedical applications. The HA/TiO2-coated TiZr alloy displayed excellent bioactivity when soaked in a simulated body fluid (SBF) for an appropriate period. Differential scanning calorimetry, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy-energy dispersive spectrometry were used to characterize the phase transformations and the surface structures and to assess the in vitro tests. The HA/TiO2 layers were spin-coated on the surface of TiZr alloy at a speed of 3000 rpm for 15 s, followed by a heat treatment at 600 degrees C for 20 min in an argon atmosphere sequentially. The TiO2 layer exhibited a cracked surface and an anatase structure and the HA layer displayed a uniform dense structure. Both the TiO2 and HA layers were 25 tm thick, and the total thickness of the HA/ TiO2 coatings was 50 pm. The TiZr alloy after the above HA/Ti02 coatings displayed excellent bone-like apatite-forming ability when soaked in SBF and can be anticipated to be a promising load-bearing implant material.

• 出版日期2007-5
• 单位湖南大学; 迪肯大学