摘要
本文用Sol-Gel法制备了掺杂TiO2、SiO2改性的γ-Al2O3膜,Al2O3-SiO2-TiO2混合溶胶的比例为:Al:Si:Ti=1:4:1(mol比),加入硝酸调节其pH值位1.2-2.5,可得到稳定的Al2O3-SiO2-TiO2溶胶。通过XRD分析,膜的相组成为非晶态SiO2、γ-Al2O3和Al4Ti2SiO12及TiO2,SEM分析膜主要特征为层状表面结构,平铺在支撑体上。研究发现添加剂、pH值、膜与基体之间的应力作用、浸渍时间、热处理过程对膜的形成的影响甚大。
In this study, silica and titania doped 7 -alumina membranes were prepared by the Sol-gel method. In term of AI:Si:Ti atom ratio 1:4:1, Al2O3-SiO2-TiO2 sol could be stored stably when the pH value was 1.2-2.5. XRD analysis showed that the composited membranes were consisted of non-crystalline SiO2, γ-AI2O3,Al4Ti2SiO12 and TiO2.SEM analysis revealed that the surface of composited membranes should be described as 'sheet-packed', on the substrate. The effect of addition and pH value and the stress between membrane and substrate and dipping time and heat treatment on properties of Al2O3 composite membranes are important.
出处
《陶瓷学报》
CAS
2004年第3期172-175,共4页
Journal of Ceramics
