Published May 11, 2018
| Version v1
Publication
Sol-gel deposition of hydroxyapatite coatings on porous titanium for biomedical applications
Description
The stress shielding and the poor osseointegration in titanium implants are still
problems to be resolved. In this context, this work proposes a balanced solution.
Titanium samples were fabricated, with a porosity of 100-200 µm of pore size
employing space-holder technique (50 vol. % NH4HCO3, 800 MPa at 1250 ºC during 2h
under high vacuum conditions), obtaining a good equilibrium between stiffness and
mechanical resistance. The porous titanium substrates were coated with hydroxyapatite,
obtained by sol-gel technique: immersion, dried at 80ºC and heat treatment at 450ºC
during 5h under vacuum conditions. Phases, surface morphology and interfacial
microstructure of the transverse section were analyzed by Micro-Computed
Tomography, SEM and confocal laser, as well as the infiltration capability of the
coating into the metallic substrate pores. The FTIR and XRD showed the crystallinity of
the phases and the chemical composition homogeneity of the coating. The size and
interconnected pores obtained allow the infiltration of hydroxyapatite (HA), possible
bone ingrowth and osseointegration. The scratch resistance of the coating corroborated
a good adherence to the porous metallic substrate. The coated titanium samples have a
biomechanical and biofunctional equilibrium, as well as a potential use in biomedical
applications (partial substitution of bone tissue).
Abstract
Junta de Andalucía-FEDER (Spain) Project Ref. P12-TEP-1401Abstract
Spanish Ministry of Economy and Competitiveness Grant No. MAT2015-71284-PAdditional details
Identifiers
- URL
- https://idus.us.es/handle//11441/74487
- URN
- urn:oai:idus.us.es:11441/74487