Effects of TiO2 Contents on HA/TiO2 Composite Coating by Electrophoretic Deposition

The HA composite coating with different TiO2 contents was prepared by electrophoretic deposition in this study. The composite coatings were characterized by scanning electron microscopy (SEM), Ca/P atomic ratio in composite coatings was analyzed by Energy Dispersive Spectrometer (EDS), and the adhesion strength was analyzed by Universal Material Testing Machine. The results show that the density of HA-TiO2 composite coatings was elevated with increasing TiO2 contents after sintering at 850 degrees C. The atomic ratio of Ca/P ( calcium and phosphorus) of the HA/TiO2 composite coatings showed a rising trend with the increasing contents of TiO2 in suspensions. The atomic ratio of Ca/P was 1.69 and 1.75 which was close to the human bone (1.67), when the TiO2 content was 10g/L and 15g/L in the suspension, respectively. The thickness of the coatings increased with the TiO2 contents increasing, which was 30 mu m that deposited in the suspension content with 10g/L TiO2, and great combination was shown with the good uniformity of the coating. The adhesion strength was 9.10MPa as the TiO2 content was 10g/L.