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

Szymon Bajda; Yijun Liu; Riccardo Tosi; Katarzyna Cholewa-Kowalska; Michal Krzyzanowski; Michal Dziadek; Mateusz Kopyscianski; Stanislaw Dymek; Alexander V Polyakov; Irina P Semenova; Tomasz Tokarski

doi:10.1016/j.jmbbm.2021.104519

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

J Mech Behav Biomed Mater. 2021 Jul:119:104519. doi: 10.1016/j.jmbbm.2021.104519. Epub 2021 Apr 20.

Affiliations

¹ Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, Krakow, 30-059, Poland. Electronic address: sbajda@agh.edu.pl.
² Manufacturing Technology Centre, Ansty Park, Coventry, CV7 9JU, United Kingdom.
³ Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, Krakow, 30-059, Poland.
⁴ Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, Krakow, 30-059, Poland; Birmingham City University, Faculty Computing, Engineering & the Built Environment, Millenium Point, Curzon Street, Birmingham, B4 7XG, United Kingdom.
⁵ Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, Krakow, 30-059, Poland; Faculty of Chemistry, Jagiellonian University, Golebia 24, Krakow, 31-007, Poland.
⁶ Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Mickiewicza 30, Krakow, 30-059, Poland.
⁷ Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marx Str., Ufa, 450008, Russia.
⁸ Academic Center of Materials and Nanotechnology, AGH University of Science and Technology, Mickiewicza 30, Krakow, 30-059, Poland.

PMID: 33915438
DOI: 10.1016/j.jmbbm.2021.104519

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 characterised 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.

Keywords: Bioactive glass; In vitro; Laser cladding; Numerical analysis; Pure titanium; Ultrafine-grained structure.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Biocompatible Materials
Glass*
Lasers
Materials Testing
Surface Properties
Titanium*

Substances

Biocompatible Materials
Titanium