Abstract
Hydroxyapatite (HA) coatings with strong (002) preferred orientation were successfully prepared on Ti-6Al-4V substrates with conventional atmospheric plasma spraying (APS). The intensity changes of (002) preferred orientation along the coating depth were investigated and the mechanical properties of these coatings were analyzed. Results indicated that the intensity of (002) preferred orientation at a distance of longer than ~90 mm from the interface showed a high value, where uniformly distributed columnar grains in a direction perpendicular to the coating surface were observed. The results obtained from experiments on the mechanical properties revealed that the (002) oriented coatings prepared by conventional APS technique exhibited excellent mechanical properties. Meanwhile, this study provided a simple and rapid method for the preparation of HA coatings with (002) preferred orientation.
Highlights
A high bioactivity and long-term durability hydroxyapatite (HA) coating is required for medical applications
The chemical stability in the body flood and the mechanical performances of HA coatings must be taken into consideration for medical applications
Hydroxyapatite (HA) coatings with strong (002) preferred orientation were successfully prepared on Ti-6Al-4V substrates by a conventional atmospheric plasma spraying (APS) technique
Summary
A high bioactivity and long-term durability hydroxyapatite (HA) coating is required for medical applications. Oriented HA coatings have attracted attention due to their high chemical stabilities and good mechanical properties [1,2]. Research has shown that HA crystals in both long bones and tooth enamel have a preferred orientation [3,4]. Such oriented HA ceramics may enable control over cellular behavior [5,6]. In vitro behavior has shown that HA crystals with (002) preferred orientation promote cell adhesion [7]. The preparation of HA coatings with (002) preferred orientation might be highly reliable in medical applications.
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