硅碱钙石微晶玻璃中晶相相变(英文)  

Phase Transition of Different Crystals in Canasite-Based Glass-Ceramics

作　　者：程金树[1] 邓炜[1] 郑伟宏[1] 田培静[1] 林墨洲[1] 季守林[1] 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《硅酸盐学报》2012年第10期1415-1419,共5页Journal of The Chinese Ceramic Society

摘　　要：采用高纯的SiO2、Al2O3、KNO3、Na2CO3、CaCO3及CaF2熔融制备了组成为8.4Na2O 1.3Al2O3 5K2O 10.8CaO 64SiO2 10.5 CaF2的硅碱钙石微晶玻璃,采用热力学计算及DTA,XRD和SEM等技术手段对其热处理过程中硅碱钙石和硬硅钙石晶相间的竞争和转变进行研究。经550℃热处理1h后,母体玻璃中有氟化钙晶相析出;在700℃下热处理1h后析出硬硅钙石晶相;在750～850℃下热处理1h后主晶相转变为硅碱钙石。经在700℃下延长微晶玻璃的热处理时间,观察到由硬硅钙石向硅碱钙石的晶相转变。这一转变趋势得到热力学计算的验证。Glass-ceramics based on 8.4Na2O 1.3Al2O3 5K2O 10.8CaO 64SiO2 10.5 CaF2were prepared with melting high purity SiO2,Al2O3,KNO3,Na2CO3,CaCO3 and CaF2.The competition between xonotlite and canasite during heat treatment was investigated via the thermodynamic calculation and some characterization techniques like differential thermal analysis,X-ray diffraction and scanning electron microscopy.CaF2 precipitated from the parent glass after heat-treated at 550 ℃ for 1 h.Xonotlite crystals appeared homogeneously after heat-treated at 700 ℃ for 1h.Canasite crystals became into the main crystalline phase in the range of 750 ℃ and 850 ℃ for 1h.Furthermore,the phase transition from xonotlite to canasite at 700℃ could occur when the heat treatment time increased,which could be verified via the thermodynamic calculation.

关 键 词：微晶玻璃 硅碱钙石 晶相转变 热力学计算 

分 类 号：TU502.4[建筑科学—建筑技术科学]