Glass - Back to the Future!



Presenting Author:
Ali Saleh Alzahrani
<a.alzahrani@qmul.ac.uk>

article posted 14 July 2016


Ali Alzahrani is a PhD candidate at the dental physical science unit, Queen Mary University of London. He was awarded with MSc degree in dental t echnology science in 2014 from Bartís and the London School of Dentistry, University of London. He is qualified and working as a dental technician after gaining a Diploma degree from Saudi Arabia in 2008 and BSc (Hons) degree from Cardiff Metropolitan University, UK in 2012, both in dental technology. His current research interests include syntheses, characterizations and developments of new glasses and glass-ceramics for dental application as well as other applications.






Effect of TiO2 on crystallizations of alkali rich alumina-silicate glasses

Ali Saleh Alzahrani*, Michael Cattell, Natalia Karpukhina
Institute of Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom


The addition of TiO2 in certain surface crystallised glasses known to act as nucleation agents to promote the development of a high density of internal nucleation sites and used as a key to the achievement of controlled crystallisation. Therefore, the aim of this study was to investigate the effect of TiO2 on the crystallizations of a newly developed alkali rich alumina-silicate glasses. Wherein two glass compositions based on multicomponent system containing sodium-calcium-magnesium-aluminasilicate were synthesized using melt-quench method. Glass ALZ-Ti1 contains 1.0 Mol% TiO2 and ALZ-Ti0 is a titanium free glass. Both experimental glasses were ground into fine powders (<125 Ķm) then heat-treated at identical crystallization schedule. Glasses and glass-ceramics were characterized before and after crystallizations using differential scanning calorimetry (DSC), Dilatometry (DIL), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The glass transition temperatures of the glass and glass-ceramics were extracted from DSC and DIL experiments for both compositions. Hence, this poster presentation will discuss, the effect of TiO2 on crystallisation of a newly developed alkali rich alumina-silicate glasses in terms of thermal behaviour and composition of the residual glassy matrix formed after crystallisation.



SEM photomicrographs showing the effect of TiO2 on crystallisation for both experimental glasses.