摘要
以Li20-Al2O3-SiO2(LAS)三元系微晶玻璃为研究对象,采用差热、X射线衍射和扫描电镜等研究了含磷和含氟磷LAS玻璃的析晶动力学和晶化过程,分析了氟、磷化合物对LAS玻璃晶化过程的影响机制。结果表明:氟、磷化合物对LAS玻璃的析晶过程有不同的作用机制。磷化物能显著提高LAS玻璃的析晶温度、活化能和有效频率因子,并抑制了晶体生长,但存在α-锂辉石向β-锂辉石转变;氟化合物降低了析晶温度和活化能, 因而不存在晶相转变过程,但晶体生长速度加快;氟、磷化合物同存可以调整了玻璃的析晶动力学参数,改善玻璃的析晶能力,细化晶粒,能获得所需晶相及显微结构。
The crystallization process and kinetics of Li2O-Al2O3-SiO2 （LAS） glass-ceramics were investigated using differential thermal analysis, X-ray diffraction and scanning electron microscopy, and the effect of fluoride and phosphide on the crystallization mechanism of LAS glass was analyzed. The results show that the influences of fluoride and phosphide on the crystallization process of LAS glass are different. Phosphide can obviously increase the crystallization peak temperature, activation energy and effective frequency factor, but it restrains crystal growth along with the transformation of a-spodumene to β-spodumene. Fluoride can decrease the crystallization peak temperature and activation energy, but it increases the crystal growth. The coexistence of fluoride and phosphide can adjust the crystallization kinetic parameters of LAS glass, improve the crystallization with free crystals and an acquired crystallization phase and microstructure of LAS glass-ceramics can be obtained.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2006年第6期717-722,共6页
Journal of The Chinese Ceramic Society
基金
浙江省科技计划(2003C11030)资助项目
关键词
微晶玻璃
锂铝硅酸盐
氟化物
磷化物
析晶
动力学
glass-ceramics
lithium aluminosilicate
fluoride
phosphide
crystallization
kinetics
