烧成温度对合成莫来石陶瓷膜的影响  

Effect of the sintering temperatures on the structure and performance of synthesizing mullite membrane

作　　者：漆志飞[1] 陈纲领[1] 漆虹[1] 邢卫红[1] 

机构地区：[1]南京工业大学膜科学技术研究所,材料化学工程国家重点实验室,南京210009

出　　处：《膜科学与技术》2009年第4期64-67,共4页Membrane Science and Technology

基　　金：国家“973”计划项目(2003CB615707);国家自然科学基金资助项目(20436030)

摘　　要：以正硅酸乙酯、硝酸铝和氟化铝为原料,采用溶胶-凝胶法在多孔莫来石陶瓷载体上原位反应烧结合成了晶须状多孔莫来石陶瓷膜.考察了在1 200,1 300,1 400,1 500℃烧成温度、保温2 h后对莫来石相及其膜层表面微观结构的影响.结果发现:在烧成温度为1 300℃时出现了莫来石相,并随着烧成温度的升高,莫来石相的特征峰增强;在氟化铝质量分数为10%1、500℃保温2 h条件下,膜层表面生长出长为2.5μm、宽为0.5μm、长径比(长/宽)为5的莫来石晶须,并且此时形成的莫来石晶须比较均匀,莫来石陶瓷膜平均孔径为0.75μm左右,纯水通量为725 L/(m2.h).The whisker structured macro - porous mullite membrane was prepared on macro - porous mullite supports using tetraethoxysilane（TEOS）, aluminum nitrate enneahydrate and aluminum fluoride as the starting materials by sol - gel method. Crystallization phase development and microstructure of the resulted membrane was studied by XRD and SEM, which was made with the different sintering temperatures of 1 200,1 300,1 400 and 1 500 ℃ for 2 h. The results illustrate that mullite was formed above 1 300℃ and its erystallinity improved steadily with further increasing firming temperature;after sintering at the temperature of 1 500℃ for 2 h with solid content of 10 %, the mullite whisker was 2.5μm in length, 0.5 μm in width, the aspect ratio （length/ width） was about 5 and the mullite whisker was more uniform. The average pore size of mullite membrane was about 0.75μm and the pure water flux was 725 L/（m^2·h）.

关 键 词：莫来石 晶须状结构 原位反应烧结 陶瓷膜 

分 类 号：TB383.2[一般工业技术—材料科学与工程]