片钠铝石的水热合成研究  

HYDROTHERMAL SYNTHESIS OF NaAl(OH)_2CO_3 POWDER

作　　者：张向锋[1] 温兆银[1] 吴梅梅[1] 林祖纕[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《硅酸盐学报》2003年第4期336-340,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金 (2 0 0 710 33;5 0 1770 2 9)资助项目

摘　　要：用水热法合成了片钠铝石 [NaAl(OH) 2 CO3]粉体 ,粉体颗粒长径比很大 ,呈针状。研究了几种反应条件对NaAl(OH) 2 CO3合成的影响。实验结果表明 :水热反应体系的酸碱度、温度、起始反应物的组成以及反应时间等都会影响反应产物的相组成及其颗粒形貌和大小。随着反应体系的pH值的升高 ,粉体粒径增大 ,团聚减轻 ,但以 pH值为 9.5的体系中的得到的粉体综合性能最好。适当增加反应体系的NaHCO3的用量 ,NaAl(OH) 2 CO3粒径明显减小。适当降低反应温度 ,缩短反应时间均有助于提高产物的均匀性 ,并且可以减小颗粒尺寸。NaAl(OH) 2CO 3 powder was prepared by a hydrothermal method using Al(OH) 3 which was prepared in lab freshly and NaHCO 3 as starting materials. Several factors which influence the synthesis of NaAl(OH) 2CO 3 powder were investigated, such as the reaction temperature, acidity of the reaction medium, the composition of starting materials, the reaction time on the formation, morphology and particle size of NaAl(OH) 2CO 3 powder. It is found that the particle size increases with the increasing of acidity in this hydrothermal system and when the acidity is 9.5 powder with good properties is obtained. Smaller particle size can be got by increasing NaHCO 3 content and shortening reaction time. Appropriate temperature would contribute to the formation of more slender needlelike NaAl(OH) 2CO 3 powder with excellent uniformity.

关 键 词：片钠铝石 水热合成 

分 类 号：TF123[冶金工程—粉末冶金]