Abstract
The major difficulty in fabricating hydroxyapatite (HA) coatings on titanium substrate using the electrophoretic deposition (EPD) process is the full densification and crack prevention of the coating under the restricted sintering temperature. First, HA/aluminum oxide composite coatings were fabricated on titanium substrate using the combination of electrophoretic deposition and reaction bonding process. Results show that the reaction bonding process enhances the coating's densification degree and significantly increase its bonding strength. Then, HA/Al2O3 functionally gradient coating (FGC) were also fabricated on titanium. Results show that, the preparation of FGC prevents cracking of the coating with a thickness about 35um. Chemical composition and microstructure of the HA/Al2O3 FGC exhibit obvious gradient variation. The HA/Al2O3 FGC also exhibits much higher bonding strength than that of HA coating with the same thickness.
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