Crystallization behavior and microstructure of barium borosilicate glass-ceramics

详细信息    查看全文

• 作者：Huidong Li ; Lang Wu ; ^{lang.wu@163.com" class="auth_mail" title="E-mail the corresponding author} ; Xin Wang ; Dong Xu ; Yuancheng Teng ; Yuxiang Li
• 关键词：D. Glass&ndash ; ceramics ; Crystallization ; Zirconolite ; Titanite
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：15202-15207
• 全文大小：1626 K

文摘

The crystallization mechanism and activation energy of glass–ceramics belonging to SiO₂–B₂O₃–BaO–Na₂O–CaO–TiO₂–ZrO₂–Nd₂O₃ system were investigated by Kissinger and Ozawa methods using differential thermal analysis (DTA) with different heating rates and particle sizes. The effect of different thermal treatment temperatures on the crystalline phases, microstructure of barium borosilicate glass–ceramics was also studied. The results show that two exothermal effects shift towards higher temperatures with increasing heating rate. In addition, the exothermal effects in the temperature range of 900–1050 °C shift towards higher temperatures with increasing particle size. The activation energy E (Kissinger method) and Avrami constant n associated with zirconolite are 124.38 kJ/mol and 3.4, respectively, indicating three-dimensional crystallization mechanism. The activation energy E (Kissinger method) and Avrami constant n associated with titanite are 166.13 kJ/mol and 2.2, respectively, indicating two-dimensional crystallization mechanism. Only strip-shaped zirconolite crystals are observed in the bulk of the glass–ceramics when the thermal treatment temperatures are 750–850 °C. Brick-shaped titanite crystals appear in the bulk of the glass–ceramics when the thermal treatment temperatures are higher than 900 °C.