制备和控制生长莫来石亚微米粉  

Synthesis and Controlled Growth of Mullite Submicron Powders

作　　者：吴疆[1] 李建保[1] 林红[1] 梁龙[1] 李俊峰[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2008年第A01期576-579,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50572051;50672041)

摘　　要：以结晶氯化铝(AlCl_3·6H_2O)和正硅酸乙酯((C_2H_5O)_4Si)为原料,通过溶胶凝胶法制备前驱体,经过高温煅烧制备出莫来石亚微米粉体。主要研究了溶胶凝胶过程中催化剂的含量和柠檬酸的含量对莫来石粉体微观形貌的影响。研究发现,通过调节溶胶中钨酸铵和柠檬酸的含量,可以控制莫来石的微观形貌,得到一维结构的莫来石晶粒。利用热差分析仪(TG-DSC)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)和X射线能谱仪(EDS)对莫来石粉体的物相及成分进行表征,并对微观形貌的形成机理进行了探讨。Submicron mullite powders were synthesized by the sol-gel method from hydrous aluminum chloride （AlCl3·6H2O） and tetraethoxysilane （TEOS）. The concentrations of catalyst and citric acid on the morphology of mullite powders were investigated. The phase transformation and microstructure of mullite submicron particles were studied by thermogravimetry-differential thermal analysis （TG-DSC）, scanning electron microscopy （SEM） and X-ray diffractometer （XRD）. The microstructure of mullite can be controlled to one-dimensional mullite, though adjusting the contents of the catalyst and citric acid.

关 键 词：莫来石 亚微米粉体 溶胶凝胶法 微观形貌 催化剂 

分 类 号：TQ175.6[化学工程—硅酸盐工业]