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Proceedings Paper

Hydroxyapatite thin films growth by pulsed laser deposition: effects of the Ti alloys substrate passivation on the film properties by the insertion of a TiN buffer layer
Author(s): Valentin D. Nelea; Carmen Ristoscu; Cornel Ghica; Herve Pelletier; Ion N. Mihailescu; Pierre Mille
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Paper Abstract

Hydroxyapatite (HA), Ca5(PO4)3OH, is now widely used in stomatology and orthopedic surgery. Due to a good biocompatibility combined favorable bioactivity make as HA to be considered as a challenge to successful bone repair. We grow HA thin films on Ti-5Al-2.5Fe alloy substrate by pulsed laser deposition (PLD) technique. The films were deposited in vacuum at room temperature using a KrF excimer laser ((lambda) equals 248 nm, (tau) FWHM >= 20 ns). After deposition the HA films were annealed at 550 degree(s)C in ambient air. The insertion of a bioinert TiN buffer layer at the HA film-metallic substrate interface was studied in terms of HA film microstructure and mechanical properties. SEM, TEM and SAED analysis structurally characterized films. The mechanical properties were evaluated by nanoindentation tests in static and scratch modes. Films with TiN interlayer contain uniquely crystalline HA phase and present better mechanical characteristics as compared with those deposited directly on Ti-alloy substrate.

Paper Details

Date Published: 29 June 2001
PDF: 6 pages
Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001); doi: 10.1117/12.432848
Show Author Affiliations
Valentin D. Nelea, National Institute for Laser, Plasma and Radiation Physics (Romania)
Carmen Ristoscu, National Institute for Laser, Plasma and Radiation Physics (Romania)
Cornel Ghica, National Institute for Material Physics (Romania)
Herve Pelletier, Ecole Nationale Superieure des Arts et Industries de Strasbourg (France)
Ion N. Mihailescu, National Institute for Laser, Plasma and Radiation Physics (Romania)
Pierre Mille, Ecole Nationale Superieure des Arts et Industries de Strasbourg (France)


Published in SPIE Proceedings Vol. 4430:
ROMOPTO 2000: Sixth Conference on Optics

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