摘要
R2O-CaO-SiO2-F(RCSF)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,必须对母体玻璃的成分和析晶过程进行控制。而无论是前期氟化钙晶核的析出,还是晶化阶段硅碱钙石的析晶,Ca都是不可缺少的元素。因此采用XRD、SEM等测试分析方法,研究氧化钙含量的改变对硅碱钙石系统微晶玻璃的析晶过程、晶体形貌及力学性能的影响。研究结果表明:随着微晶玻璃中氧化钙的引入量由10.8%增加至16.8%,R2O-CaO-SiO2-F系统中析出的晶相由硅碱钙石逐渐转变为硬硅钙石、硅酸钙及方石英等多种晶相。但随着氧化钙含量的升高,析晶速率过快,导致晶粒过于粗大,破坏了微观结构,降低了微晶玻璃的力学性能。
The crystallization of R2O-CaO-SiO2-F system glass-ceramics is complicated, which will precipitate various phases and result in different properties. It is necessary to control the composition and crystallization of glass-ceramics to obtain the reasonable crystalline phase. The influence of CaO content on the crystallization and microstructure is far-reaching ancl is investigated by XRD, SEM in this work. The results show that the main crystalline phases transform from canasite to xonotlite, wollastonite when the addition of CaO increases from 10.8% to 16.8%. The rate of crystallization of the specimens and the size of crystalline grain is increased when the addition of CaO increases, which resulted in the dimrdered microstructure and low flexure strength.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第22期23-25,共3页
Journal of Wuhan University of Technology
关键词
微晶玻璃
硅碱钙石
氧化钙
析晶
glass-ceramics
canasite
calcium oxide
crystallization
