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Meeting Materials Science & Technology 2020
Symposium Journal of the American Ceramic Society Awards Symposium
Presentation Title Effect of CaF<sub>2</sub>, B<sub>2</sub>O<sub>3</sub> and the CaO/SiO<sub>2</sub> Mass Ratio on the Viscosity and Structure of B<sub>2</sub>O<sub>3</sub>–Containing Calcium–silicate–based Melts
Author(s) Gihyun Kim, Il Sohn
On-Site Speaker (Planned) Il Sohn
Abstract Scope The relationship between the viscosity and structure of B<sub>2</sub>O<sub>3</sub>–containing calcium–silicate–based oxides and the effects of CaF<sub>2</sub>, CaO, and B<sub>2</sub>O<sub>3</sub> on the viscosity and their correlation with the structural aspects were studied using a rheometer with Fourier transformation infrared and Raman spectroscopy at below 1673K. The viscosity decreased with increasing CaF<sub>2</sub> addition up to 28wt% at a fixed CaO/SiO<sub>2</sub> ratio of 0.3 by depolymerization. At higher C/S ratios, the viscosity decreased in the presence of greater Ca<sup>2+</sup> and O<sup>2-</sup> supplied from CaO. With regard to the B<sub>2</sub>O<sub>3</sub>–melt, the structural polymerization was observed by comparing the B<sub>2</sub>O<sub>3</sub>–free to 4.4wt% B<sub>2</sub>O<sub>3</sub> content. However, the viscosity was relatively constant with increasing B<sub>2</sub>O<sub>3</sub> addition. However, the viscosity decreased due to greater simplification of the network structure above 4.4wt% B<sub>2</sub>O<sub>3</sub>.


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