锂铝硅微晶玻璃组成调整对黏度与析晶的影响

Effects of Composition on the Viscosity and Crystallization of Lithium Aluminosilicate Glass-ceramics

采用高温旋转黏度计、X射线衍射分析(XRD)、拉曼光谱、扫描电镜(SEM)等测试手段,研究了MgO和ZnO引入量的调整对锂铝硅微晶玻璃熔制温度、高温黏度和晶化过程的影响。结果表明:增大MgO和ZnO的引入量可以有效地降低母体玻璃的黏度。当MgO和ZnO引入量从2.0wt%增大到8.0wt%时,母体玻璃的高温黏度明显降低,熔制温度从1650℃降低到1545℃,晶化处理后析出的主晶相由β-锂辉石固溶体向LixAlxSi1-xO2固溶体转变,析晶速率加快,主晶相含量升高。此外,结合Raman光谱分析可以发现,试样中有微量的锐钛矿晶相析出。

Effects of MgO and ZnO dopants on the viscosity and crystallization of lithium aluminosilicate glass-ceramics were investigated by high temperature viscosity test,X-ray diffractometry（XRD）,Raman spectroscopy and scanning electron microscopy（SEM）.The results show that the viscosity of initial LAS glass was effectively decreased and the melting temperature decreased from 1650℃ to 1545℃ when the addition of MgO and ZnO increased from 2.0wt% to 8.0wt%.The main crystalline phase changed from β-spodumene to LixAlxSi1-x O2 and the rate of crystal growth increased with increasing the content of MgO and ZnO,which resulted in the higher crystallinity.Moreover,the Raman spectra indicate that the anatase precipitated was the minor phase for all specimens.