Thermo-mechanical behaviour of alkali free bioactive glass-ceramics co-doped with strontium and zinc
authors Kapoor, S; Goel, A; Pascual, MJ; Ferreira, JMF
nationality International
journal JOURNAL OF NON-CRYSTALLINE SOLIDS
author keywords Bioactive glasses; Thermal properties; Sintering; Glass-ceramics; Mechanical strength
keywords IN-VITRO; PHOSPHATE; DIOPSIDE; CELLS; BIODEGRADATION; REACTIVITY; SPECTRA; APATITE; PHASE
abstract We report on the influence of SrO and ZnO co-doping on thermo-mechanical behaviour of alkali free bioactive glass-ceramics in system: (mol%) (36.07 - x) CaO-x SrO-(19.24 - y) MgO-y ZnO-5.61 P2O5-38.49 SiO2-0.59 CaF2 (x = 2-10, y = 2-10). Hot-stage microscopy and differential thermal analysis revealed that densification of all the glass powders occurs before the onset of crystallization, resulting in well sintered and mechanically strong glasses/glass-ceramics after heat treating for 1 h under non-isothermal conditions at 800, 850 and 900 degrees C. The crystalline phase assemblage in the sintered compacts included diopside (CaMgSi2O6) and fluorapatite [Ca-5(PO4)(3)F] with partial replacement of Ca for Sr with increasing strontium contents. The effect of heat treatment temperature on mechanical reliability was assessed by Weibull statistical analysis applied to the flexural strength data. The results obtained revealed that a better balance of properties was achieved for the samples sintered at 850 degrees C These results provide an insight into the choice of final material/experimental conditions for the development of three-dimensional porous scaffolds for bone tissue engineering. (c) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0022-3093
year published 2013
volume 375
beginning page 74
ending page 82
digital object identifier (doi) 10.1016/j.jnoncrysol.2013.05.007
web of science category Materials Science, Ceramics; Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000322297700012
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journal impact factor 2.929
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