Fabrication and microstructure of Al2O3-TiO2 composite membranes with ultrafine pores

被引：27

作者：

Bae, DS ^{[1
]}

Cheong, DS ^{[1
]}

Han, KS ^{[1
]}

Choi, SH ^{[1
]}

机构：

[1] KOREA INST SCI & TECHNOL, DIV CERAM, SEOUL 136791, SOUTH KOREA

来源：

CERAMICS INTERNATIONAL | 1998年 / 24卷 / 01期

关键词：

composite membrane; Al2O3-TiO2; sol-gel method; thermal stability;

D O I：

10.1016/S0272-8842(96)00072-7

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A ceramic membrane consisting of an alpha-Al2O3 support and an Al2O3-TiO2 top layer, which is thermally stable up to 900 degrees C, was prepared by the sol-gel method. The supported Al2O3-TiO2 top layer was made by dip-coating the support in a mixed sol. The microstructure of the composite membranes was studied by SEM and TEM after calcination at 850-1000 degrees C. After sintering at 850 degrees C for Ih, the average particle diameter of the Al2O3-TiO2 top layer was about 15 nm. The supported Al2O3-TiO2 composite membranes exhibited much higher heat resistance than the TiO2 membranes. Although significant grain growth was observed for the TiO2 membrane after heating above 700 degrees C due to phase transformation, the Al2O3-TiO2 composite membrane retained a crack-free microstructure and narrow particle size distribution even after calcination up to 900 degrees C. (C) 1997 Elsevier Science Limited and Techna S.r.l.

引用

页码：25 / 30

页数：6

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