摘要
R2O-CaO-SiO2系统微晶玻璃是一种新型的高级建筑装饰材料,引入F作为晶核剂,在制备过程中容易发生各种相变,影响工业化生产。采用X射线衍射分析、场发射扫描电镜研究氟引入量对相变的影响,以有效控制分相、成核和析晶过程。结果表明:氟的引入量由3.3%增加到6.3%,使得退火后玻璃易于发生分相。当退火温度从450℃提高到550℃,虽然母体玻璃并未产生明显的失透现象,但场发射电镜测试结果表明此时仍发生成核。晶化处理之后,微晶玻璃析出了硅碱钙石和a-硅碱钙石晶相。
R2O-CaO-SiO2 system glass-ceramics is a kind of new advanced building and decorative materials.The additions of F as nucleating agent are liable to cause phase transitions in the preparation process,which influences industrial production.In this paper,the effect of different additions of F on the phase transitions was investigated by means of XRD,FE-SEM to control the phase separation,nucleation and crystallization.The results showed that as the F content added from 3.3% to 6.3%,glasses were liable to phase separation after annealed.When the annealing temperature increased from 450 ℃ to 550 ℃,although devitrification of base glass was not significant,the FE-SEM results showed that the nucleation still occurred at this time.After the crystallization treatment,canasite/a-canasite was precipitated as the main crystalline phase.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第22期84-86,91,共4页
Journal of Wuhan University of Technology
基金
国家自然科学基金(50802065)
武汉理工大学新教师科研启动基金(2010IV071)
关键词
微晶玻璃
硅碱钙石
氟
退火温度
分相
glass-ceramics
canasite
fluorine
annealing temperature
phase separation
