Abstract
This work investigates the effect of CaO addition on physico-chemical properties, crystallization, chemical durability and bioactivity of phosphate-based glasses. To this end, five glass compositions in the system (40-x)Na2O-xCaO-10ZnO-20TiO2-30P2O5 with x = 0, 5, 10, 15 and 20 mol % have been elaborated by the conventional melt-quenching technique. Replacing Na2O with CaO oxide in the studied glasses increased remarkably the glass transition temperature Tg and density (ρ), while VM decreased with increasing CaO content indicating the high strength in the glass network. The existence of PO3 and PO4 units with P-O-P and P-O-Ti linkages in the glassy network was revealed by Infrared spectroscopy. The chemical durability was improved with increasing calcium content, indicating that replacing Na-O bonds with more covalent and stronger Ca-O bonds strengthen and crosslink the glassy network. The in vitro bioactivity of the two glass samples (x = 0 and 15 mol %) was studied using SBF solution. XRD, Infrared, ICP, and pH measurements proved the formation of a hydroxyapatite layer on the glass surface after interaction with the SBF medium, which is a crucial property of a potential bioactive glass. The correlation between XRD, Infrared, and ICP techniques indicated that glass containing calcium is more bioactive than free-calcium glass.
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