中文摘要：

以TiO2、ZrO2为晶核剂,用＂两步法＂热处理制备MgO-Al2O3-SiO2（MAS）系统透明微晶玻璃。采用X射线衍射分析（XRD）、扫描电镜（SEM）、场发射环境扫描电镜（FE-ESEM）、紫外-可见光光度计对材料进行了表征。实验结果表明,热处理温度在1 000℃以下时,仅有唯一晶相镁铝尖晶石（MgAl2O4）存在;在1 050℃时,β-石英晶体析出,但尖晶石仍为主晶相。玻璃中晶体的析出使紫外吸收极限向长波方向移动,随着晶化温度的升高,晶粒尺寸增大,微晶玻璃光透过率下降。经830℃核化保温4 h、950℃晶化保温1.5 h得到的微晶玻璃样品平均晶粒尺寸仅为25.6 nm,紫外截止率达100%,可见光透过率为62%。

英文摘要：

The transparent MgO-Al2O3-SiO2（MAS） glass-ceramic doped with TiO2 and ZrO2 as nucleation agents was prepared by traditional two-step heat treatment.The specimens were analyzed by X-ray diffraction,scanning electron microscopy,field emission-environment scanning electron microscope（FE-SEM） and UV scanning spectrophotometer.Only one crystal phase namely magnesium-aluminum spinel（MgAl2O4） exists below 1 000 ℃.The β-quartz phase precipitates at 1 050 ℃,while the main crystal phase is still spinel.The precipitation of spinel crystal phase makes the UV cut-off wavelength increased.With the increase of crystallization temperature,the grain size gets bigger,and the light transmission of glass-ceramic becomes lower.After the heat-treatment at 830 ℃/4 h＋950 ℃/1.5 h,the mean grain size of the specimen is only 25.6 nm,and the UV cut-off rate of this specimen is 100%,while the transmission is 62% in visible light region.