Title of article :
Fabrication and characterization of nanometer CaP(aggregate)/Al2O3 composite coating on titanium
Author/Authors :
He، نويسنده , , Li-Ping and Mai، نويسنده , , Yiu-Wing and Chen، نويسنده , , Zong-Zhang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Abstract :
Nanometer CaP(aggregate)/Al2O3 composite coating on titanium for implant application has been successfully fabricated using a hybrid technique of anodization and hydrothermal treatment. Techniques, such as X-ray diffraction (XRD), scanning electron microscopy and energy disperse X-ray analysis (SEM+EDX), and transmission electron microscopy (TEM), have been used to investigate the composition, microstructure and morphology of the fabricated CaP(aggregate)/Al2O3 composite coating. SEM and EDX studies show that pure Al thin film is uniformly deposited on titanium substrate using magnetron sputtering physical vapor deposition (PVD) technique, and porous anodic aluminium oxide (AAO) film containing Ca and P are formed after anodization. XRD result indicates that the fabricated composite coating contains Al2O3 and various calcium phosphate phases. SEM and TEM results show that the crystals of CaP aggregates are in nanometers. It is also found that the fabricated nanometer CaP(aggregate)/Al2O3 composite coating is characterized by a porous cylindrical microstructure after hydrothermal treatment, which could lead to better biological and mechanical properties. In addition, anodization voltage is shown to have significant effects on the extent of anodization of the AAO film, and the optimal voltage is in the range 40–50 V.
Keywords :
Biomedical implant , hydrothermal treatment , Anodization , PVD , Titanium , Nanocomposite coating , Calcium phosphates
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Journal title :
MATERIALS SCIENCE & ENGINEERING: A