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Oxynitride Glasses for Potential Biomedical Usage

Abstract : The low strength of bioglasses have restricted their use to non-load bearing applications and therefore improvements in mechanical properties are needed. One solution to this challenge is to incorporate nitrogen into the glass silicate network. This paper outlines the effect of nitrogen on properties and structure of two series of glasses: (1) a “bioglass” composition (without P2O5) in the Na2O-CaO-SiO2 system plus Si3N4 to give different levels of N and (2) glasses of series (1) with a simple substitution of CaF2 for CaO. In both cases, the Na:Ca:Si ratio was kept constant so that changes in properties and structure were simply a result of changes in O:N ratio. Properties were all observed to increase linearly with nitrogen content. These increases are consistent with N in the glass structure in 3-fold coordination with silicon and extra cross-linking of the glass network. The combination of both nitrogen and fluorine in series (2) glasses gives better mechanical properties at much lower melting temperatures since fluorine reduces Tm, allows higher solubility of nitrogen and does not affect the higher mechanical properties arising from incorporation of nitrogen. The local structure around silicon and nitrogen was investigated by 29Si MAS-NMR spectroscopy which confirms formation of SiO3N, SiO2N2 tetrahedra with extra bridging anions. Bioactivity was assessed and is discussed.
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Submitted on : Tuesday, December 14, 2021 - 10:47:00 AM
Last modification on : Friday, January 21, 2022 - 3:33:44 AM

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Stuart Hampshire, Ahmed Bachar, Cyrille Albert-Mercier, Arnaud Tricoteaux, Anne Leriche, et al.. Oxynitride Glasses for Potential Biomedical Usage. Proceeding of the 42nd International Conference on Advanced Ceramics and Composites, John Wiley & Sons, Inc., pp.33-46, 2019, Ceramic Engineering and Science Proceedings, 978-1-119-54330-5. ⟨10.1002/9781119543381.ch4⟩. ⟨hal-03479008⟩

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