Non-isothermal Calorimetric Studies of the Crystallization of Lithium Disilicate Glass
Non-isothermal Calorimetric Studies of the Crystallization of Lithium Disilicate Glass
复制标题
二硅酸锂玻璃结晶的非等温量热研究
DOI：
10.1016/0022-3093(96)00401-2
复制
发表时间：
1996
影响因子：
3.5
通讯作者：
K. Kelton
中科院分区：
文献类型：
--
作者：
C. Ray;D. Day;Wen;K. Narayan;T. Cull;K. Kelton
研究了预退火处理对二硅酸锂玻璃晶型的影响。正如预期的那样，玻璃在温度范围内以不同的速度加热，在那里有显著的成核作用，形成的原子核数量相差很大。这会显著影响退火玻璃的稳定性和相变特性。非等温差示扫描量热仪(DSC)和差热分析(DTA)测量结果表明，非等温差示扫描量热法(DSC)和差热分析法(DTA)可用于探索成核行为。首次系统地研究了颗粒尺寸对非等温转变行为的影响。基于DTA和显微镜实验，我们发现小颗粒的二硅酸锂玻璃主要是通过表面析晶来析晶的。通过改变颗粒大小、引入成核剂和将玻璃暴露在不同水分含量的大气中，考察了表面晶化与体积晶化的相对重要性。这些数据使用在本卷之后的第二篇论文中开发的数值模型进行了定量分析。
The influence of preannealing treatments on the polymorphic crystallization of lithium disilicate glasses is examined. As expected, glasses heated at different rates through the temperature range where there is significant nucleation develop widely different numbers of nuclei. This can dramatically influence the stability and transformation characteristics of the annealed glass. Non-isothermal differential scanning calorimetry (DSC) and differential thermal analysis (DTA) measurements are demonstrated to be useful to probe the nucleation behavior. The first systematic investigations of particle size effects on the non-isothermal transformation behavior are presented and discussed. Based on DTA and microscopy experiments, we show that small particles of lithium disilicate glasses crystallize primarily by surface crystallization. The relative importance of surface versus volume crystallization is examined by varying particle size, by introducing nucleating agents and by exposing glasses to atmospheres of different water content. These data are analyzed quantitatively using a numerical model developed in a second paper following in this volume.