title: Textured hydroxyapatite interface onto biomedical titanium-based coatings.
abstract: 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.
authors.affiliation: Departmento Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain. miguel.mano@uam.es
authors.forename: Miguel
authors.initials: M
authors.lastname: Manso
authors.forename: P
authors.initials: P
authors.lastname: Herrero
authors.forename: M
authors.initials: M
authors.lastname: Fernández
authors.forename: M
authors.initials: M
authors.lastname: Langlet
authors.forename: J M
authors.initials: JM
authors.lastname: Martínez-Duart
mesh_terms: D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D006882:Hydroxyapatites / Q000737:chemistry*; D008958:Models, Molecular; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D020099:Coated Materials, Biocompatible; D006882:Hydroxyapatites; C041500:titanium nitride; D014025:Titanium