Characterization and fracture property of different strontium-containing borate-based glass coatings for Ti6Al4V substrates
Journal of Non-Crystalline Solids
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© 2016 Elsevier B.V. This work considered the effect of increasing Strontium ion (Sr2+) content on the structure of a series of glasses based on the B2O3-P2O5-CaCO3-Na2CO3-TiO2-SrCO3 series and their resultant fracture toughness when coated onto a surgical metal substrate. Six glasses with increasing Sr2+ content (0 to 25 mol%) were synthesized and subsequently characterized by X-ray Diffraction (XRD), Differential Thermal Analysis (DTA) and both Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) and Raman Spectroscopy. These techniques confirmed that increased Sr2+ content induced more non-bridging oxygens (NBOs) into the glass network. This would be expected to lead to de-polymerization of the glass structure, as would be evinced by lower glass transition temperatures (Tgs) as Sr2+ increased within the glass series. However, Tg was found to increase with Sr2+ addition, inferring that the strength of the ionic bond between strontium and oxygen (Sr[sbnd]O) enhanced network rigidity. The glasses were coated onto Ti6Al4V substrates using an enamelling technique, and the critical strain energy release rates (GIC) of the resultant coating/substrate constructs were measured. The incorporation of 15–25 mol% Sr2+ into the glass network was found to significantly increased the toughness of the glass/Ti6Al4V constructs.