Thermal Sprayed Bioceramic Coatings: Nanostructured Hydroxyapatite (HA) and HA-Based Composites - Biological and Biomedical Coatings: Processing and Characterization - page 176

HA
Anatase TiO 2
α-TCP
CaTiO 3
Rutile TiO 2
CaO

(b)

(a)

20 30 40 50 60 70 [˚20] 80
2θ (deg)

FIGURE 4.28
XRD patterns of the HVOF sprayed (a) pure HA coating and (b) HA + 20 vol.% TiO 2 composite coating. (From Li
et al., Biomaterials , 24, 949-957, 2003. With permission.)

(a) (b)

Reaction layer

Reaction layer

TiO 2

1 µm

50 nm

FIGURE 4.29
Morphology of the HA/titania composite structure showing (a) titania is surrounded by a chemical reaction
layer, and the enlarged bright interface zone (b) showing that the reaction layer has a thickness of around
140 nm. (From Li et al., Biomaterials , 24, 949-957, 2003. With permission.)