【摘要】 以氨水为沉淀剂,采用共沉淀法按一定比例分别制备了ZrO₂-Al₂O₃、Al₂O₃-CeO₂、ZrO₂-CeO₂、ZrO₂- Al₂O₃-CeO₂等4种前驱复合粉体。利用差热-热重分析（DTA/TG）和X射线衍射（XRD）对4种粉体的热转变过程以及不同温度煅烧后的物相组成进行了对比分析,研究了ZrO₂-Al₂O₃-CeO₂复合粉体间在煅烧过程中的化学反应及相互影响。结果表明:CeO₂与ZrO₂优先形成固溶体,CeO₂与Al₂O₃直到1300℃也未发生任何反应;Al₂O₃的存在明显提高了c-（Ce,Zr）O₂的结晶温度,1300℃退火后t-（Ce,Zr）O₂仍能保留到室温。更多还原

【Abstract】 The composite precursor powders of ZrO₂-Al₂O₃,Al₂O₃-CeO₂,ZrO₂-CeO₂ and ZrO₂-Al₂O₃-CeO₂ system are respectively prepared with a fixed proportion by co-precipitation method,using ammonia as precipitant. Thermal behaviors of these precursor powders are investigated by the differential thermal analysis and thermogravime- try（DTA-TG）.The phase identifications after calcined at different temperatures are characterized by X-ray diffractom- etry（XRD）.The results reveal that ZrO₂ and CeO₂ are prior to forming Ce-Zr solid solution and no chemical reactions happen between CeO₂ and Al₂O₃ up to 1300℃.The crystallization temperature of cubic Zr-Ce solid solution rises due to the existence of Al₂O₃ and tetragonal Zr-Ce solid solution can be retained at room temperature after calcination at 1300℃.更多还原