摘要
本文利用ＳｏｌＧｅｌ法制备了Ａｌ２Ｏ３ＳｉＯ２ＴｉＯ２复合陶瓷薄膜，讨论的主要内容是体系成分（Ａｌ∶Ｓｉ∶Ｔｉ摩尔比）对薄膜制备过程及结构的影响。通过分步水解法可以得到稳定的Ａｌ２Ｏ３ＳｉＯ２ＴｉＯ２复合溶胶，进而制备复合陶瓷薄膜。组分间的静电作用是溶胶凝结的原因。三组分中，Ｓｉ／Ｔｉ摩尔比是决定溶胶稳定性的主要因素。通过ＸＲＤ对薄膜的相组成进行了分析，表明复合薄膜由Ａｌ４Ｔｉ２ＳｉＯ１２（２Ａｌ２Ｏ３·ＳｉＯ２·２ＴｉＯ２，准锐钛矿结构）、Ａｌ２Ｏ３、ＳｉＯ２和非晶态ＳｉＯ２组成，薄膜中各相的相对含量取决于体系成分。另外，透射电镜（ＴＥＭ）和原子力显微镜（ＡＦＭ）的分析结果表明：复合薄膜的主要结构特征是层状表面结构，微孔来自层状结构内部，而不是层间隙。薄膜的微观结构随成分改变化而变化。由薄膜的结构特征可以看到该薄膜有极大的表面改性潜力。
Preparation of Al_2O_3SiO_2TiO_2 composite ceramic membanes was investigated in this paper. Focus was put on investigaton of the effects of composition on preparation scheme and membrane structure. Stable composite sol sould be obtained by “order hydrolysis” of the metal alkoxides, and composite membranes could be fabricated in this way. Stability of the sol was affected by composition ( in term of Al∶Si∶Ti atom ratio), mainly determined by Si/Ti ratio. XRD analysis showed that the compostied membranes was consisted of Al4Ti2SiO12 (2Al2O3·SiO2·2TiO2)、Al2O3、TiO2 and noncrystalline SiO2. Microstructure and surface morphology of the membranes were detected by Transmission Electron Microscope (TEM) and Atom Force Microscope (AFM). The results revealed that the surface of composite membranes should be descnbed as “sheetpacked”, and the nanopres came from interior of the sheets (not from interval of the sheets). The characteristics of the composite membranes showed great potedtiality of being surface modification.
出处
《功能材料》
EI
CAS
CSCD
北大核心
1997年第6期599-603,共5页
Journal of Functional Materials
关键词
复合薄膜
制备
陶瓷薄膜
膜技术
composite membrane solgel, preparation, structure
