University of Oulu

Avila, I., Pantchev, K., Holopainen, J. et al. J Mater Sci: Mater Med (2018) 29: 111.

Adhesion and mechanical properties of nanocrystalline hydroxyapatite coating obtained by conversion of atomic layer-deposited calcium carbonate on titanium substrate

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Author: Avila, Inari1; Pantchev, Konstantin1; Holopainen, Jani2;
Organizations: 1Department of Anatomy and Cell Biology, Institute of Cancer Research and Translational Medicine, Medical Research Center, University of Oulu, Oulu, Finland
2Department of Chemistry, University of Helsinki, P.O. Box 55, FI- 00014 Helsinki, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2 MB)
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Language: English
Published: Springer Nature, 2018
Publish Date: 2019-07-17


The purpose of this study was to evaluate the mechanical properties of nanocrystalline hydroxyapatite coating by tensile adhesion testing and scratch testing. The coating was manufactured on titanium substrate by converting atomic layer-deposited (ALD) calcium carbonate thin film in dilute phosphate solution. The tensile adhesion testing was performed with hydraulic testing device in accordance with ISO 4624 and ISO 16276-1. Scratch testing was done according to SFS-EN 13523-12 with spherical 10 µm scratching tip. Characterization of the samples was done with light and electron microscopy after which they were stained with alizarin red and the failure modes and loadings were analyzed. The highest obtained tensile adhesion value was 6.71 MPa produced with 4000 ALD cycles, converted to hydroxyapatite in alkaline solution, and annealed for 30 min in 700 °C. The annealing improved the adhesion values by approximately 0.8 MPa, but examining the samples with electron microscopy showed intact coating in both annealed and non-annealed samples. Samples produced with 4000 cycles performed better in testing than 2000 cycle samples, and better adhesion was also achieved with alkaline conversion solution compared to neutral solution.

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Series: Journal of materials science. Materials in medicine
ISSN: 0957-4530
ISSN-E: 1573-4838
ISSN-L: 0957-4530
Volume: 29
Issue: 8
Article number: 111
DOI: 10.1007/s10856-018-6121-x
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This work was supported by the Finnish Centre of Excellence in Atomic Layer Deposition.
Copyright information: © Springer Science+Business Media, LLC, part of Springer Nature 2018. This is a post-peer-review, pre-copyedit version of an article published in J Mater Sci: Mater Med. The final authenticated version is available online at: