包钢高炉渣制备微晶玻璃的析晶方式研究

Study on Crystallization Method of Glass-ceramics Prepared from Blast Furnace Slag of Baotou Steel Corporation

以包钢高炉渣为主要原料,采用熔融法制备CaO-MgO-Al_2O_3-SiO_2系微晶玻璃,通过差热分析(1TA)、X射线衍射(XRD)、扫描电子显微镜(SEM)分析方法,并借助Ozawa方程研究了添加不同数量晶核剂时的析晶方式。研究结果表明:分别加入8%CaF_2、8%TiO_2和4%P_2O_5作晶核剂时,晶化指数n均小于3,析晶方式为表面析晶;当加入晶核剂为8%P_2O_5时,晶化指数n大于3,析晶方式为整体析晶。

CaO-MgO-Al2O3-SiO2 glass-ceramics were prepared by melting method adopting Baotou Steel blast furnace slag as the main raw material. The crystallization method of glass containing different kinds/ amounts of nucleating agents was investigated by means of DTA, XRD, SEM and the Ozawa equation. The results show that the crystallization index n is less than 3 for the basic glass respectively added with 8wt% CaF2, 8wt% TiO2 and 4wt% P2O5 as nucleating agent, which is surface-crystallization. But the crystallization index n is more than 3 and the basic glass was bulk crystallization when P2O5 is added up to 8wt%.