摘要
配合料Li2O-ZnO-Al2O3-SiO2于铂金坩埚中在1 600℃熔融2 h,经2步热处理工艺控制成核及晶体生长,制备出透明玻璃陶瓷。采用差热分析(DTA)、X射线衍射(XRD)、扫描电镜(SEM)、傅里叶红外光谱FT-IR和UV-Vis-NIR分光光度计对材料进行表征。热处理温度在970℃以下的玻璃陶瓷只有一种立方结构的锌尖晶石ZnAl2O4晶相存在。热处理温度为970℃时,开始析出四面体β-石英晶相;1100℃时,四面体β-石英成为主晶相,锌尖晶石变成次晶相。晶粒尺寸符合正态分布,标准偏差随热处理温度增加而增加。根据XRD结果计算出立方锌尖晶石晶体的晶格参数为α=0.8093 nm(±0.0007),与标样十分接近。
Li2O-ZnO-Al2O3-SiO2 glass was melted in a platinum crucible at 1 600 ℃ for 2 h, and then a two-step heat treatment for the nucleation and crystal growth was used to prepare transparent glass- ceramics. The characterizations were performed by differential thermal analysis, X-ray diffraction, Fourier transmission infrared spectroscopy, spectrophotometer. Only one crystal phase low 970 ℃, and tetrahedral B-quartz phase scanning electron microscopy and UV-Vis-NIR scanning namely cubic gahnite ZnAl2O4 exists when heat-treated bebegins to precipitate at 970 ℃ and becomes the main crystal phase at 1 100 ℃, at the same time, gahnite ZnAl2O4 becomes the minor crystal phase. The grain size distributes normally, and the standard deviation increases with the heat treatment temperature increasing. The lattice parameter of cubic gahnite calculated by the XRD data is 0.809 3 nm（ ± 0.000 7）, which is very close to that of the standard sample.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2007年第2期253-256,共4页
Acta Armamentarii
基金
教育部优秀青年教师资助项目(KB20026)
关键词
分析化学
锌尖晶石
玻璃陶瓷
晶化
微结构表征
analytical chemistry
gahnite
glass-ceramics
crystallization
microstructure characterization
