Abstract
HAp/Al2O3 composite coating was fabricated onto micro-arc oxidized titanium substrate using a combination of electrophoretic depo-sition and reaction bonding process. SEM, EDS and XRD were employed to characterize the titanium substrate and as-prepared coat-ings. The interfacial bonding strength of the sintered composite coating was tested by shear strength testing experiment. Results show that the green form composite coating can be easily sintered with no cracks and de-composition at 850℃, the bonding strength to the substrate is significantly improved com-pared with the single HAp coating.
Highlights
Titanium and its alloys are widely used for dental and orthopedic implants, because of their high mechanical properties, chemical stability, and biocompatibility
Electrophoretic deposition of HAp coating onto metallic substrate has gained wide interest and previous researches have demonstrated that EPD is an attractive method for formation of biomedical implants and a number of advantages of this method have been suggested [10]
Prior to EPD of the composite coating, the titanium substrate was treated by micro-arc oxidation (MAO) in a sulfate solution under constant current density of 50 mA/cm2
Summary
Titanium and its alloys are widely used for dental and orthopedic implants, because of their high mechanical properties, chemical stability, and biocompatibility. Electrophoretic deposition of HAp coating onto metallic substrate has gained wide interest and previous researches have demonstrated that EPD is an attractive method for formation of biomedical implants and a number of advantages of this method have been suggested [10]. The thermal expansion coefficient of titanium substrate is much lower than that of HAp (αTi= 8.7×10-6 /K, αHAp=13.6×10-6 /K), so large thermal contraction mismatch would arise and tend to induce the formation of cracks when cooled from the elevated temperatures; besides, a significant firing shrinkage during sintering will lead to the formation of cracks in coatings as well. The reaction bonding process would overcome problems caused by the firing shrinkage during sintering [7] Both the two advantages have been proved to be beneficial in avoiding the formation of cracks and improvement of bonding strength of ceramic coatings [11]. MAO surface modification was done prior to the deposition of composite coating
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