TiO2对CaO-Al2O3-SiO2系玻璃晶化机理的影响

使用差热分析（DTA）方法研究了TiO2对CaO－Al2O3－SiO2系玻璃晶化机理的影响，发现在CaO－Al2O3－SiO2系玻璃中，引入TiO2有助于玻璃网络聚合程度的降低，从而导致玻璃的粘度减小，转变温度Tg和析晶峰温度Tp的降低.玻璃的析晶难易程度和析晶峰温度的高低不存在相互对应关系．CaO－Al2O3－SiO2系玻璃中，不管是否加入TiO2，均以表面晶化为主，TiO2的晶核剂效果不显著．充分的核化热处理也不能促使含TiO2的CaO－Al2O3－SiO2系玻璃发生体积晶化，TiO2的含量越高，核化热处理后玻璃的表面晶化效果越显著．

Effect of TiO2 on the Crystallization of CaO-Al2O3-SiO2 System Glass

The method of differential thermal analysis (DTA) was used to investigate the effect of TiO2on the crystallization of CaO-Al2O3-SiO2 system glass. When TiO2 is added to the CaO-Al2O3SiO2 system glass, the glass network becomes more loose, that leads to the viscosity of glass,transition temperature Tg and crystallization peak temperature Tp decreasing. That the glass isdifficult or easy to crystallize does not mean that the crystallization peak temperature Tp is highor low. Whether the CaO-Al2O3-SiO2 system glass contains TiO2 or not, the glass mainly beginsto crystallize from the surface. When TiO2 is used as a nucleation agent, its effect on promotingcrystallization is not obvious. After heat-treatment at the nucleation temperature for a long time,CaO-Al2O3-SiO2 system glass containing TiO2 still begins to crystallize from the surface, and themore TiO2 the glass contains, the more obvious the surface crystallization is.