Cr2 O3、TiO2对高炉渣制备微晶玻璃晶化方式的影响

以包钢高炉渣为主要原料,采用熔融法制备CaO-SiO2-MgO-Al2O3系微晶玻璃,主要通过差热分析方法,并借助于Augis-Bennett方程和Ozawa方程研究了分别添加2%Cr2O3和8%TiO2作晶核剂时基础玻璃的晶化方式.研究结果表明:添加2%Cr2O3作晶核剂时,晶体生长指数均可实现大于3,晶化方式为整体晶化;而添加8%TiO2作晶核剂时,晶体生长指数均不可能大于3,晶化方式为表面晶化.因此,Cr2O3是高炉渣制备透辉石类微晶玻璃适宜的晶核剂成分,可单独用作晶核剂,而TiO2无法使基础玻璃整体晶化,不能单独用作晶核剂.研究结果为利用高炉渣成功研制开发透辉石类微晶玻璃在晶核剂种类选择确定方面提供了理论指导.

Influence of Cr2 O3 ,TiO2 on the Crystallization Method of Glass-ceramics Prepared by Blast Furnace Slag

CaO-SiO2-MgO-Al2O3 glass-ceramics were prepared by melting method adoping the blast furnace taken from Baotou iron and steel company as the main raw material. The crystallization methods of parent glass containing nucleating agents 2%Cr2O3 ,8%TiO2 were respectively investigated by means of differential thermal analysis(DTA),the Augis-Bennett equation and the Ozawa equation. The resulsts show that the crystal growth indexes can be more than 3 and the parent glass is bulk crystallization when 2%Cr2O3 is added;but they are impossible to be more than 3 for the parent glass added with 8%TiO2 as the nucleating agent,which is surface-crystallization. Therefore,Cr2O3 is appropriaate for glass-ceramics prepared from the blast furnace slag,which can be alone used as the nucleating agent,but TiO2 can't be used alone. The results provide a theoretical guidance for selecting proper nucleating agents to develop diopside glass-ceramics successfully with blast furnace slag.