Textured hydroxyapatite interface onto biomedical titanium-based coatings.
Hydroxyapatite (HAP) bioceramic coatings grown onto titanium-nitride (TiN) buffer layers by the aerosol-gel procedure present interfaces with a preferred growth orientation. These coatings were crystallized at 800 degrees C and subsequently etched to ease the study of the interface by Auger electron spectroscopy depth profiling. Ion beam milling was applied to cross-section samples to analyze the interface structures using transmission electron microscopy. At the interface, the HAP crystals showed a <002> orientation. It was shown by Auger electron spectroscopy depth profiling that O atoms diffuse into the nitride interlayer, indicating that the formation of O channels in the HAP structure is the driving force inducing the textured film. The outstanding biocompatible properties of both the materials and properties of their interface suggest that HAP/TiN structures are particularly well suited for endoprosthetic applications.
Manso
Miguel
M
Departmento Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain. miguel.mano@uam.es
Herrero
P
P
Fernández
M
M
Langlet
M
M
Martínez-Duart
J M
JM
D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D006882:Hydroxyapatites / Q000737:chemistry*; D008958:Models, Molecular; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
D020099:Coated Materials, Biocompatible; D006882:Hydroxyapatites; C041500:titanium nitride; D014025:Titanium