SiO_2-Al_2O_3-MgO-F系微晶玻璃的受压析晶  

Pressure Crystallization of SiO_2-Al_2O_3-MgO-F Glass Ceramics

作　　者：田清波[1] 孔德钰[1] 代金山 王修慧[2] 高宏[2] 

机构地区：[1]山东建筑大学材料科学与工程学院,济南250101 [2]大连交通大学精细陶瓷中心,大连116028

出　　处：《人工晶体学报》2014年第2期409-413,共5页Journal of Synthetic Crystals

基　　金：山东省中青年科学家奖励基金(BS2009CL050)

摘　　要：用X射线衍射(XRD)和扫描电子显微镜(SEM)研究了SiO2-Al2O3-MgO-F系块状玻璃在受压条件下的析晶特征。采用高温熔融法制备基础玻璃,在热处理过程中施加压力制备微晶玻璃。结果表明:样品在热压过程中析出主要晶体为云母相,施加压力对析出晶体的种类影响不大。但是不同阶段施加压力对析出晶体的形态有显著的影响,在核化阶段施压可以形成晶体的定向生长,在晶化阶段施压对晶体的择优生长有较大影响。但是仅在核化阶段施压,卸载后再析晶则会降低晶体择优长大的趋势。The crystallization behaviors of SiO2-Al2O3-MgO-F glass under appliecl pressures werv investigated by X-ray diffraction （XRD） and scanning electron microscopy （SEM） techniques. The base glass was prepared by melting-quenching method and the glass-ceramic was obtained by thermal treatment, at the same time the different pressures were applied. The results indicate that mica phase is the mainly crystals in the crystallizing process and the pressures have little effects on the types of crystal precipitated. But the pressure, applied at different stage, has a significant impact on the morphology of the crystals. Applying pressure in the nucleating stage may lead to the mica crystal oriented crystallization, and applying pressure in the crystallization stage promotes the preferential growth of crystals. However, the tendency with the preferential-growth of mica crystal was decreased when the pressure was applied only in the nucleating stage.

关 键 词：微晶玻璃 SIO2-AL2O3 -MgO-F系玻璃 定向析晶 云母相 

分 类 号：TQ171[化学工程—玻璃工业]