铝酸钡-钙矿相体系的实验研究

Experimental studies of the BaAl_2O_4-CaAl_2O_4 system in calcium aluminate cement clinker

以碳酸钡、碳酸钙和氧化铝为原料,设计配方在不同温度下煅烧,制备了铝酸钡-钙复相水泥。运用X射线粉末衍射(XRD)和扫描电子显微镜(SEM)等手段,对铝酸钡与铝酸钙在不同温度下的固溶过程及相转变进行了分析。结果表明:在升温过程中,首先形成大量的铝酸钡,随着温度升高,铝酸钙含量增多。同时,还出现了少量七铝酸十二钙、铝酸二钙和铝酸三钙。铝酸钡呈柱状,铝酸钡-钙固溶相主要由板状六角形或钝圆状小晶体堆积而成。

The aluminate cement clinker was successfully synthesized from starting materials of barium carbonate,alumina and calcium carbonate by designing mineral phase composition sintered at different temperatures. The formation mechanism of cement clinker was investigated by XRD and SEM. The results show that BaAl2O4 is mainly formed at relatively low temperatures,and then CaAl2O4 obviously increases with the increase of temperature in forming solid solution of BaAl2O4 and CaAl2O4. In addition,there exists a small amount of Ca12Al14O33 ,CaAl2O4 and Ca3Al2O6.in cement clinker. BaAl2O4 is mostly present in the shape of puncheon,and solid solution of BaAl2O4 and CaAl2O4 is developed into hexagon and round crystals.