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Mechanical properties of pulsed laser-deposited hydroxyapatite thin films for applications in biomedical implants

Published online by Cambridge University Press:  11 February 2011

Hyunbin Kim ,
Yogesh K. Vohra ,
William R. Lacefield  and
Renato P. Camata
Hyunbin Kim
Affiliation:
Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294
Yogesh K. Vohra
Affiliation:
Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294
William R. Lacefield
Affiliation:
Department of Prosthodontics and Biomaterials, University of Alabama at Birmingham, Birmingham, Alabama 35294
Renato P. Camata
Affiliation:
Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294
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Abstract

We have obtained nanostructured hydroxyapatite thin films on titanium alloy substrates by pulsed laser deposition. Deposition was carried out using a KrF excimer laser (248 nm) with the energy density of 4 – 7 J/cm2 at substrate temperatures in the 550°C - 650°C range. The crystallinity of the coatings was probed by X-ray diffraction. Phase transitions from hydroxyapatite to other calcium phosphate compounds were observed with varying the substrate temperature during the growth process. Scanning electron microscopy revealed thin films made up of partially sintered nanoscale grains. The average size of nanoscale grains increased significantly with film thickness, suggesting a growth mechanism involving the coalescence of nanoscale grains. As the laser energy density increases, the hydroxyapatite crystallites in the coatings are oriented preferentially along the c-axis perpendicular to the substrate. Mechanical properties of the highly c-axis oriented coatings such as hardness and Young's modulus were studied by using nanoindentation technique.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 750: Symposium Y – Surface Engineering 2002–Synthesis, Characterization and Applications , 2002 , Y8.13
Copyright
Copyright © Materials Research Society 2003

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References

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