Laser cladding of bioactive glass coating on pure titanium substrate with highly refined grain structure

Bajda, Szymon and Liu, Yijun and Tosi, Riccardo and Cholewa-Kowalska, Katarzyna and Krzyzanowski, Michal and Dziadek, Michal and Kopyscianski, Mateusz and Dymek, Stanislaw and Polyakov, Alexander V. and Semenova, Irina P. and Tokarski, Tomasz (2021) Laser cladding of bioactive glass coating on pure titanium substrate with highly refined grain structure. Journal of Mechanical Behavior of Biomedical Materials. ISSN 1751-6161

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Abstract

Free from toxic elements biomaterial potentially applicable for load bearing biomedical implants was obtained for the first time by laser cladding of S520 bioactive glass onto ultrafine-grained commercially pure titanium. The cladding process affected the refined structure of the substrate inducing martensitic transformation near its surface. The α’ acicular martensite gradually passes into relatively large grains with increasing distance from the substrate surface, which subsequently are transformed into smaller grains of about 2 μm in diameter. Both the melted zone, where the martensite crystalline structure was found, and the HAZ are characterized by relatively lower hardness in comparison with that of the substrate core indicating increased ductility. Such a combination of zones with different properties may have a synergistic effect and is beneficial for the obtained biomaterial. A characteristic region in the form of about 3 µm width band was formed in the melted zone at about 10 µm below the titanium surface. The results of EDS analysis indicate that several glass elements moved into the region while the titanium content in the same area was decreased. High bioactivity of the coated S520 glass was revealed by in vitro testing with SBF solution and almost complete reduction of P concentration occurred after 14 days.

Item Type: Article
Identification Number: https://doi.org/10.1016/j.jmbbm.2021.104519
Date: 20 April 2021
Uncontrolled Keywords: laser cladding, ultrafine-grained structure, pure titanium, bioactive glass, numerical analysis, in vitro
Subjects: F200 Materials Science
J300 Ceramics and Glasses
J500 Materials Technology not otherwise specified
Divisions: Faculty of Computing, Engineering and the Built Environment > School of Engineering and the Built Environment
Depositing User: Michal Krzyzanowski
Date Deposited: 26 Apr 2021 15:37
Last Modified: 26 Apr 2021 15:37
URI: http://www.open-access.bcu.ac.uk/id/eprint/11571

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