Browsing by Author "Skelly, Kiel D."
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ItemInvestigating the Effects of TiO2 on the Structure and Properties of SiO2-P2O5-CaO-SrO-Na2O Based Glasses(New York State College of Ceramics at Alfred University. Inamori School of Engineering., 2019-09) Skelly, Kiel D.; Wren, Anthony; Clare, Alexis; Tidrow, StevenBioactive glasses have been researched and developed for dental and orthopedic applications since 1969. Current research has examined the substitution of non-traditional ions within the SiO2-CaO-Na2O-P2O5 which are suspected to improve the biological or material properties of bioactive glasses. This study examines four glass-ceramic compositions and the properties to understand the effects of increasing TiO2 concentration when substituted at 20, 40, and 60 mol % into a Bioglass based composition. Examining the structure of the glass shows that it is possible to achieve a fully amorphous material via melt quenching for concentrations up to 20 mol % TiO2. The thermal working range of the glasses is expanded with 20 mol % TiO2, 567 - 720°C, then the Tg window decreases as higher TiO2 concentrations are incorporated into the glass, 605 - 705°C and 635 - 717°C for 40 and 60 mol % respectively. The mechanical strength is affected by the sintering temperature with 800°C for the 20 mol % TiO2 best matching trabecular bone strength with a modulus of 1.79(±0.16) GPa. Ionic release is negatively impacted by the addition of TiO2, limiting the use of high TiO2 compositions as a bioactive material. Comparison of the 0 mol % and 20 mol % samples show a slower release of ions and consequently deposition of ions in a manner that suggest bioactivity with incorporation of TiO2 into the glass.