埋炭热处理时Al_2O_3-SiC-TiO_2-C浇注料的物相演变  

Phase evolution of Al_2O_3-SiC-TiO_2-C castable firing in carbon-embedded atmosphere

作　　者：尹玉成[1] 梁永和[1] 葛山[1] 聂建华[1] 刘志强[1] 乔婉[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081

出　　处：《耐火材料》2014年第1期43-45,共3页Refractories

摘　　要：为了探明可否通过原位反应在Al2O3-SiC-TiO2-C浇注料中合成碳氮化钛，在Al2O3-SiC-TiO2-C浇注料常规配方中直接加入6％质量分数的TiO，制备了Al2O3-SiC-TiO2-C浇注料，结合1100-1500℃下埋炭热处理后浇注料的物相组成分析结果及热力学计算，研究了Al2O3-SiC-TiO2-C浇注料的物相演变过程。结果表明：在热处理温度为1100℃时，体系内的主要变化为锐钛矿向金红石的转变过程；加热至1200℃后，体系内的单质硅则可以完全与碳反应生成SiC；当温度升至1300℃时，体系内的金红石TiO2开始被还原而转变为Ti3O5，同时铝酸钙水泥的主要组分CaO、Al2O3与SiO2之间也开始相互反应生成钙铝石榴石相；温度升高至1400℃后，莫来石相开始生成，同时Ti3O5继续被还原并氮化转变为碳氮化钛；1500℃时，已经不再有新相生成，但莫来石和碳氮化钛的量明显增多，且晶格发育更加完善。Al2O3-SiC-TiO2-C castable was prepared by direct adding 6 mass% TiO2 into the conventional Al2O3-SiC-TiO2-C castable to study whether titanium carbonitride can be in-situ formed in Al2O3-SiC-TiO2-C castable or not. Adopting thermodynamic calculations and XRD analysis,the phase evolution process of Al2O3-SiC-TiO2-C castable was investigated. The results indicate that the main change is the phase transformation from anatase to rutile at 1100℃ ;at 1 200℃,all Si reacts with C forming SiC;at 1300℃, rutile be- gins to be reduced to Ti3O5 ,and the main components of calcium aluminates cement,CaO and Al2O3, react with SiO2 forming grossularite; at 1 400℃, mullite forms, meanwhile Ti3O5 is further reduced and nitridized into titanium carbonitride;at 1 500℃,no new phase forms,but the amounts of mullite and titanium carbonitride increase obviously,and their crystal structures trend to be much more perfect.

关 键 词：Al2O3-SiC-TiO2-C浇注料 物相组成 二氧化钛 碳氮化钛 

分 类 号：TQ175.1[化学工程—硅酸盐工业]