钛渣中TiO₂作晶核剂对玻璃晶化的影响^①

来源期刊：中国有色金属学报2000年第1期

论文作者：李彬 齐琳琳 隋智通

文章页码：117 - 119

关键词：钛渣;二氧化钛;晶核剂;玻璃晶化

Key words：slags bearing titanium; titania; nucleation; glass crystallization

摘    要：制备了以钛渣和铁尾矿为主要原料,以钛渣兼作晶核剂的微晶玻璃材料,研究了TiO₂含量变化对玻璃晶化的影响。采用DTA, SEM, XRD等技术对该体系的晶化机理进行探讨。结果表明,当TiO₂含量小于10%时仅产生表面晶化,而当TiO₂含量为10%时可发生整体晶化,其活化能为190.6 kJ·mol^-1,动力学参数m=3,晶体从晶核界面呈三维生长。TiO₂和Fe₂O₃能共同促进晶化,晶体从相界面处生长,析出的主晶相为钙铁辉石。

Abstract: The glass ceramics were prepared by using titanium slags and ferrous tailings as the raw materials, in which TiO₂ functioned as the nucleation agents. The effect of TiO₂ content on the crystallization was studied. The crystallization process was investigated by DTA, XRD and SEM. It was showed that the bulk crystallization process occurs when the content of TiO₂ is 10%. The activation energy for crystal growth, E_c=190.6 kJ·mol^-1, and the kinetic parameter m=3 were evaluated by DTA and kinetic method. The main crystal phase of glass ceramic is hedenbergite and has good strength property. It was found that TiO₂ and Fe₂O₃ can efficiently induce nucleation and crystallization. When the TiO₂ content is fewer than 10%, the surface crystallization occurs.