In situ visualization of crystallization inside high temperature silicate melts
In situ visualization of crystallization inside high temperature silicate melts
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DOI：
10.1063/1.3406149
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发表时间：
2010-06
影响因子：
3.2
通讯作者：
A. Srivastava;Y. Inatomi;K. Tsukamoto;Takao Maki;H. Miura
中科院分区：
文献类型：
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作者：
A. Srivastava;Y. Inatomi;K. Tsukamoto;Takao Maki;H. Miura
目前的工作涉及使用光学投影技术对强过冷硅酸盐熔体内部的结晶过程进行实时原位可视化。在无容器条件下对镁橄榄石组合物进行结晶实验。使用高功率 CO2 激光器将起始材料加热至液相线温度 (2169 K) 以上，并在快速冷却后开始结晶。通过调节CO2激光器的输出功率，独立地采用三个不同的过冷值（ΔT≈320、400和500 K，以镁橄榄石成分的液相线温度为参考计算）来启动成核过程。该研究的主要结果表明，适当设计的光学系统能够在高达液相线附近的温度下对熔体对流进行成像，并提出了一种实时非破坏性预测所得结晶纹理的新方法。使用开发的光学装置，...
The present work is concerned with the real time in situ visualization of crystallization processes inside strongly supercooled silicate melts using optical projection technique. The crystallization experiments are carried out for forsterite composition under container-less conditions. Starting material is heated above its liquidus temperature (2169 K) using a high power CO2 laser and crystallization is initiated following rapid cooling. Three different values of supercooling (ΔT≈320, 400, and 500 K, calculated with respect to the liquidus temperature of forsterite composition as reference) are independently employed to initiate the nucleation process by adjusting the output power of CO2 laser. Primary findings of the study show that a suitably designed optical system is capable of imaging melt convection at temperatures as high as near liquidus and presents a novel approach for the prediction of resultant crystallization textures in real time nondestructively. Using the developed optical arrangement, for...