Table of Contents
ISRN Ceramics
Volume 2012 (2012), Article ID 816902, 5 pages
http://dx.doi.org/10.5402/2012/816902
Research Article

Modeling of Viscosity and Thermal Expansion of Bioactive Glasses

Department of Materials Engineering, University of Technology, Baghdad 10066, Iraq

Received 9 October 2012; Accepted 8 November 2012

Academic Editors: P. Valerio and C.-F. Yang

Copyright © 2012 Saad B. H. Farid. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The behaviors of viscosity and thermal expansion for different compositions of bioactive glasses have been studied. The effect of phosphorous pentoxide as a second glass former in addition to silica was investigated. Consequently, the nonlinear behaviors of viscosity and thermal expansion with respect to the oxide composition have been modeled. The modeling uses published data on bioactive glass compositions with viscosity and thermal expansion. -regression optimization technique has been utilized for analysis. Linear and nonlinear relations are shown to establish the viscosity and thermal expansion coefficients associated with oxide components of the glasses under study. The modeling allows the calculation of viscosity for a given temperature and, accordingly, the fusion temperature of these glasses along with the coefficient of thermal expansion. The established model relations also suggest first- and second-order phosphorus-alkali and alkaline earth oxides interaction which is reflected on the model coefficient that calculates viscosity and thermal expansion.