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J. Funct. Biomater. 2016, 7(4), 32; doi:10.3390/jfb7040032

Silica-Based and Borate-Based, Titania-Containing Bioactive Coatings Characterization: Critical Strain Energy Release Rate, Residual Stresses, Hardness, and Thermal Expansion

1
Department of Mechanical & Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada
2
St. Michael’s Hospital, Toronto, ON M5B 1W8, Canada
3
Department of Surgery, University of Western Ontario, London, ON N6A 4V2, Canada
4
Oakville Trafalgar Memorial Hospital, Oakville, ON L6J 3L7, Canada
5
Faculty of Health Sciences, Department of Surgery, McMaster University, Hamilton, ON L8S 4L8, Canada
6
School of Mechanical and Manufacturing Engineering, Dublin City University, Dublin D09 W6Y4, Ireland
7
Department of Biomedical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
*
Author to whom correspondence should be addressed.
Academic Editor: Adriana Bigi
Received: 12 October 2016 / Revised: 25 November 2016 / Accepted: 28 November 2016 / Published: 1 December 2016
View Full-Text   |   Download PDF [1893 KB, uploaded 1 December 2016]   |  

Abstract

Silica-based and borate-based glass series, with increasing amounts of TiO2 incorporated, are characterized in terms of their mechanical properties relevant to their use as metallic coating materials. It is observed that borate-based glasses exhibit CTE (Coefficient of Thermal Expansion) closer to the substrate’s (Ti6Al4V) CTE, translating into higher mode I critical strain energy release rates of glasses and compressive residual stresses and strains at the coating/substrate interface, outperforming the silica-based glasses counterparts. An increase in the content of TiO2 in the glasses results in an increase in the mode I critical strain energy release rate for both the bulk glass and for the coating/substrate system, proving that the addition of TiO2 to the glass structure enhances its toughness, while decreasing its bulk hardness. Borate-based glass BRT3, with 15 mol % TiO2 incorporated, exhibits superior properties overall compared to the other proposed glasses in this work, as well as 45S5 Bioglass® and Pyrex. View Full-Text
Keywords: enameling; coefficient of thermal expansion; borate-based glass; indentation enameling; coefficient of thermal expansion; borate-based glass; indentation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rodriguez, O.; Matinmanesh, A.; Phull, S.; Schemitsch, E.H.; Zalzal, P.; Clarkin, O.M.; Papini, M.; Towler, M.R. Silica-Based and Borate-Based, Titania-Containing Bioactive Coatings Characterization: Critical Strain Energy Release Rate, Residual Stresses, Hardness, and Thermal Expansion. J. Funct. Biomater. 2016, 7, 32.

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