MgO-Al23-SiO2系微晶玻璃论文：钐掺杂的MAS系微晶玻璃的制备及性能研究.doc

MgO-Al2O3-SiO2系微晶玻璃论文：钐掺杂的MAS系微晶玻璃的制备及性能研究 【中文摘要】微晶玻璃作为新型结构和功能材料,以其优良的光、电、磁、化学等性能在国防尖端技术、机械制造、微电子技术等领域都得到了广泛的应用。本文阐述了MgO-Al2O3-SiO2系微晶玻璃的制备方法及性能研究。采用熔融和退火技术合成出MgO-Al2O3-SiO2系微晶玻璃,并掺杂稀土Sm3+离子。实验中以TiO2作为晶核剂,根据DSC结果制定出玻璃的晶化热处理制度。根据XRD曲线可知,随着热处理温度的升高,主晶相未发生变化,仍为Mg2Al4Si5O18。采用UV-Vis-NIR分光光度计测定钐掺杂MgO-Al2O3-SiO2系玻璃及微晶玻璃的光透过率,随着晶化热处理温度的升高,光透过率逐渐降低。在可见光区域内光波段透过率为40%-81%。在近红外区域内光波段透过率为50%-83%。采用SEM观察微晶玻璃的形貌,利用比例尺估算出晶粒尺寸为10-20nm。测量了基质玻璃和微晶玻璃的荧光光谱,稀土离子在微晶玻璃中的发光性能强于基质玻璃。 【英文摘要】Glass-ceramics as a new structural and functional materials, for its excellent optical, electrical. magnetic, and chemical properties in defense advanced technology, machinery manufacturing, micro-electronics technology, and other fields have been widely used.The dissertation presented that a study on preparation and properties of the MgO-Al2O3-SiO2 system transparent glass-ceramics. MgO-Al2O3-SiO2 system transparent glass-ceramics doped with rare-earth ion Sm3+ were synthesized by the melting method and annealing technique, TiO2 as nucleation agent. The crystallization heat-treated schedules were determined by DSC results. According to XRD curve, with the crystallization heat-treatment temperature increamed, the main phase is Mg2Al4Si5O18. The lattice parameter of main crystal phase was calculated by XRD results. It was similar to the lattice parameter of the standard sample. The mean gain size was calculated by XRD results, and it was about 10nm-20nm. The optical transmittances of the glass and glass-ceramics were measured by UV-Vis-NIR spectrophotometer. With the increase of crystallization heat-treated temperature, the optical transmittances decreamed, even lost transparency. The sparency of the glass-ceramic can get 40%-81% in visible region, 50%-83% in near infrared region.The surface of glass-ceramics were observed by SEM. The grain size was estimated by SEM, and it was similar to the grain size of calculated by XRD results. The fluorescence spectra of the glass and glass-ceramics were measured. Th