高温下氧化物与氟化物电解质反应研究  

Reaction Between Oxides and Fluoride Electrolyte at High Temperature

作　　者：徐义彪[1] 李亚伟[1] 桑绍柏[1] 秦庆伟[1] 杨建红[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,武汉430081

出　　处：《材料导报》2012年第22期106-110,124,共6页Materials Reports

基　　金：湖北省科技厅自然科学基金(2009CDA050)

摘　　要：利用Factsage热力学软件预测分析了高温下典型氧化物分别与氟化物AlF3、Na3AlF6及K3AlF6之间的化学反应,并采用氧化物粉末与电解质混合和氧化物烧结体浸泡两种实验方法验证了900℃时氧化物与电解质的反应。采用X射线衍射仪及扫描电子显微镜等分析了试样的物相组成和显微结构。结果表明:主族元素氧化物普遍比过渡元素氧化物易于和含AlF3、Na3AlF6及K3AlF6的电解质反应;并且CaO.6Al2O3、MgAl2O4、Mg2TiO4、Al2TiO5、NiFe2O4与AlF3、Na3AlF6及K3AlF6电解质反应程度依次减弱;基于浸泡实验发现,降低烧结试样的显气孔率能有效提高其抗电解质侵蚀性能。The chemical reactions between typical oxides and fluoride （A1F3, Naa AIF6 and Ka A1F6 ） were calcu lated by Factsage software. Then two experimental methods, namely oxide powders mixed with electrolyte and sin tered oxide specimen immersion tests were taken to verify the chemical reactions between oxides and electrolytes at 900℃. The phase composition and microstructure of the specimens after the experiments were analyzed by means of X-ray diffractometer and scanning electron microscope. The results show that the oxides of main group elements are commonly much easier than that of transition elements to react with electrolyte containing A1Fa, NaaAlF6 and KaAIF6; the reactions of CaO. 6Al2O3, MgA1204, Mg2TiO4, Al2TiO5, NiFe2O4 with electrolyte above become gradually weaker in order; electrolytic corrosion resistance of sintered specimens could be effectively improved by lo wering apparent porosity based on the results of immersion tests.

关 键 词：化学反应 热力学预测 氧化物 电解质 抗侵蚀 

分 类 号：TQ170.1[化学工程—硅酸盐工业]