摘要
以粉煤灰、石灰石和Na2CO3为原料,通过熔融烧结法制备了粉煤灰微晶玻璃。借助DTA、XRD及SEM等分析测试手段,研究了核化温度(760℃)及晶化温度(850-1000℃)对微晶玻璃析晶行为、显微形貌、烧结性能及化学稳定性的影响。结果表明,样品核化处理后除生成少量霞石相,主体仍为玻璃相;在晶化处理后,所形成的微晶玻璃样品主晶相为钙铝黄长石相;随晶化温度的升高,微晶玻璃样品晶相种类不变,但主晶相含量、线收缩率及体积密度呈现先增高后降低的变化;粉煤灰微晶玻璃具有良好的析晶性能及化学稳定性,在晶化温度为950℃时得到的微晶玻璃烧结效果和化学稳定性最好。
The glass-ceramics was prepared with coal fly ash, limestone and Na2CO3 by sintering process. Effects of nucleation temperature （760 ℃） and crystallization temperature （850-1000 ℃） on crystallization behavior, microstructure, sintering character and chemical stability of glass- ceramics samples were analyzed by means of DTA, XRD, SEM and other analytical methods. The results show that besides a limited amount of nepheline emerges in the nucleating samples, the main form of the sample is glass phase. The main crystalline phase of the obtained glass-ceramics after crystallization is gehlenite （2CaO. A1203~ SiO2）. With the increasing of heat treatment temperature, the species of the crystalline is the same, but the main crystalline intensity, line shrinkage rate and bulk density increase first, and then decrease. The glass-ceramics have good crystallization properties and chemical stability. The glass-ceramics samples with best sintering character and chemical stability are obtained by crystallizing at 950 ℃.
出处
《非金属矿》
CAS
CSCD
北大核心
2013年第4期5-8,共4页
Non-Metallic Mines
基金
固体废物处理与资源化教育部重点实验室开放基金(12zxgk04)
关键词
粉煤灰
微晶玻璃
核化
晶化
烧结
coal fly ash glass-ceramics nucleation crystallization sintering
