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Mechanical, structural and dissolution properties of heat treated thin-film phosphate based glasses

Stuart, Bryan W.; Gimeno-Fabra, Miquel; Segal, Joel; Ahmed, Ifty; Grant, David M.

Mechanical, structural and dissolution properties of heat treated thin-film phosphate based glasses Thumbnail


Authors

Bryan W. Stuart

DAVID GRANT DAVID.GRANT@NOTTINGHAM.AC.UK
Professor of Materials Science



Abstract

Here we show the deposition of 2.7 μm thick phosphate based glass films produced by magnetron sputtering, followed by post heat treatments at 500 °C. Variations in degradation properties pre and post heat treatment were attributed to the formation of Hematite crystals within a glass matrix, iron oxidation and the depletion of hydrophilic P-O-P bonds within the surface layer. As deposited and heat treated coatings showed interfacial tensile adhesion in excess of 73.6 MPa; which surpassed ISO and FDA requirements for HA coatings. Scratch testing of coatings on polished substrates revealed brittle failure mechanisms, amplified due to heat treatment and interfacial failure occurring from 2.3 to 5.0 N. Coatings that were deposited onto sandblasted substrates to mimic commercial implant surfaces, did not suffer from tensile cracking or trackside delamination showing substantial interfacial improvements to between 8.6 and 11.3 N. An exponential dissolution rate was observed from 0 to 2 h for as deposited coatings, which was eliminated via heat treatment. From 2 to 24 h ion release rates ordered P > Na > Mg > Ca > Fe whilst all coatings exhibited linear degradation rates, which reduced by factors of 2.4–3.0 following heat treatments.

Journal Article Type Article
Acceptance Date Apr 15, 2017
Online Publication Date Apr 18, 2017
Publication Date Sep 15, 2017
Deposit Date Jun 2, 2017
Publicly Available Date Jun 2, 2017
Journal Applied Surface Science
Print ISSN 0169-4332
Electronic ISSN 0169-4332
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 416
Pages 605-617
DOI https://doi.org/10.1016/j.apsusc.2017.04.110
Keywords Heat treatment; Phosphate glass; Mechanical properties; Ion leaching; Osseointegration; Thin films
Public URL https://nottingham-repository.worktribe.com/output/882811
Publisher URL http://www.sciencedirect.com/science/article/pii/S0169433217311273
Additional Information This article is maintained by: Elsevier; Article Title: Mechanical, structural and dissolution properties of heat treated thin-film phosphate based glasses; Journal Title: Applied Surface Science; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.apsusc.2017.04.110; Content Type: article; Copyright: © 2017 The Author(s). Published by Elsevier B.V.

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