亚微米Li_2O-Al_2O_3-SiO_2微晶玻璃制备

Preparation of Sub-micron Li_2O-Al_2O_3-SiO_2 Glass-ceramics

本文利用DTA、XRD和SEM对Li2O-Al2O3-SiO2(以下简称LAS)微晶玻璃核化晶化热处理制度及氟离子在该玻璃体系中的作用进行研究。通过分析得出:含氟LAS玻璃核化温度和晶化温度分别为620℃和710℃,比相同组份的不含氟Li2O-Al2O3-SiO2玻璃核化、晶化温度分别降低了40℃和160℃左右;引入氟离子明显降低LAS玻璃析晶温度,系统的活化能降低约54kJ/mol,当含氟LAS玻璃的核化时间为1h、晶化时间为4hrs,平均微晶颗粒尺寸在50nm左右。

In order to get sub-micron Li2O-Al2O3-SiO2 glass-ceramics, fluoride has been added into glass. It is proposed that the glass will nucleate at 620℃ by differential thermal analysis （DTA） and crystallize at 710℃ through the results of X-ray diffraction （XRD）. After the glass nucleated at 620℃ for 1 hour and crystallized at 710℃ for 4 hours, sub-micro β-spodumene crystals about 50nm have formed in the glass by scanning electron microscopy（SEM）. It is proved that the introduction of fluoride decreases Li2O-Al2O3-SiO2 glass activation energy（E） for about 54kJ/mol, and even more nuclei lead to restrain of development of crystal.