摘要
R2O-CaO-SiO2-F系统微晶玻璃析晶过程较为复杂,能析出多种晶相,导致性能发生改变。为获得预期的性能,必须对母体玻璃结构和析晶过程进行控制。而Al2O3质量分数的改变对母体玻璃结构和析晶会产生深远的影响,因此本文采用XRD、SEM、IR等测试分析方法,研究Al2O3对微晶玻璃结构和析晶过程的影响。结果表明:铝离子以四配位参与到玻璃的硅氧网络结构中,随着Al2O3引入量的增大,母体玻璃的网络结构得到加强。当氧化铝质量分数为2.5%时,微晶玻璃晶化后析出氟化钙和a-硅碱钙石晶相,当氧化铝质量分数增大至3.5%和4%时,微晶玻璃析出的晶相转变为氟化钙和硬硅钙石,氧化铝质量分数继续升高至4.5%时,微晶玻璃析出的晶相转变为氟化钙、硬硅钙石和a-硅碱钙石晶相。
The crystallization of R2O - CaO - SiO2 - F system glass - ceramics was complicated, which resulted in various kinds of crystals and different properties. It was necessary to control the crystallization so as to achieve the desired performances. The influence of mass fraction of Al2O3 on the crystallization and microstructure was investigated by XRD, SEM and IR. The results showed that the addition of Al2O3 would strengthen the glass network. Moreover, the crystal phases became CaF2 and a -canasite if the mass fraction of alumina was 2.5%. However, the crystal phases were transferred into CaF2 and xonotlite when the mass fraction of alumina was 3.5% and 4%. When the mass fraction of alumina increased up to 4.5 % , the CaF2, a - canasite and xonotlite were precipitated.
出处
《玻璃与搪瓷》
CAS
2009年第4期5-8,共4页
Glass & Enamel
关键词
微晶玻璃
硅碱钙石
氧化铝
析晶
glass - ceramics
canasite
alumina
crystallization
