Predicting glass transition and crystallization temperatures of silicate bioglasses using mixture designs

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• 作者：C. Dué ; e ; ^{cedricduee@aol.com} ; F. Dé ; sanglois ; I. Lebecq ; C. Follet-Houttemane
• 关键词：Mixture designs ; Bioactive glass ; Glass transition ; Crystallization ; Working range
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2012
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：15 April, 2012
• 卷：358
• 期：8
• 页码：1083-1090
• 文件大小：829 K

摘要

Mixture designs have been applied on bioglasses in the range 42-55%SiO₂, 13.5-48%CaO, 10-35%Na₂O, 0-5%P₂O₅, and 0-13.5%CaF₂ (mol%). This study focused on glass transition temperature (T_g), crystallization temperature (T_c) and working range (temperature gap between T_g and T_c). The designs, elaborated from data obtained by Differential Thermal Analysis (DTA), consist of equations connecting the properties with the glass molar composition. Using this powerful mathematical method, T_g, T_c and the working range of bioglasses can be precisely predicted and optimized. We found that a Na, P or F addition decreases T_g. Crystallization occurs at higher temperature when phosphorus is added in small quantity, due to network polymerization, although further addition induces a decrease of T_c related to a decrease of the overall strength of the glass network. Fluoride affects crystallization of both manners, depending on the calcium and sodium contents. Last, as a network modifier, Na lowers T_c. The widest working ranges are obtained for glasses with a large quantity of SiO₂, CaO, and P₂O₅ and a medium quantity of CaF₂, allowing to reach a difference between T_c and T_g of up to 260 掳C.