Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/94766

Title

Selection of the implant and coating materials for optimized performance by means of nanoindentation

Author(s)

Saber-Samandari, Saeed;  Berndt, Christopher C.;  Gross, Karlis A.

Abstract

Mechanical compatibility between a coating and a substrate is important for the longevity of implant materials. While previous studies have utilized the entire coating for analysis of mechanical compatibility of the surface, this study focuses on the nanoindentation of a uniformly thermally sprayed splat. Hydroxyapatite was thermally sprayed to create a homogeneous deposit density, as confirmed by microRaman spectroscopy, of amorphous calcium phosphate. Substrates were commercially pure Ti, Ti–6Al–4V, Co–Cr alloy and stainless steel. Nanoindentation revealed that splats deposited on the different metals have similar hardness and elastic modulus values of 4.2 ± 0.2 GPa and 80 ± 3 GPa, respectively. The mechanical properties were affected by the substrate type more than residual stresses, which were found to be low. It is recommended that amorphous calcium phosphate is annealed to relieve the quenching stress or that appropriate temperature histories are chosen to relax the stress created in cooling the coating assembly.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Industrial Research Institute Swinburne

Source

Acta Biomaterialia, Vol. 7, no. 2 (Feb 2011), pp. 874-881

Publication year

2011

FOR Code(s)

0903 Biomedical Engineering;  1004 Medical Biotechnology

Keyword(s)

Droplets;  Hydroxyapatite;  Nanoindentation;  Substrate effects;  Thermal spray

Publisher

Elsevier

ISSN

1742-7061

Publisher URL

http://dx.doi.org/10.1016/j.actbio.2010.09.023

Copyright

Copyright © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Peer reviewed