Study on preparation technique of unsymmetrical microporous composite ceramics membranes

Citation
Hy. Wang et al., Study on preparation technique of unsymmetrical microporous composite ceramics membranes, ACT CHIM S, 58(8), 2000, pp. 1015-1021
Citations number
13
Language
CHINESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
ACTA CHIMICA SINICA
ISSN journal
0567-7351 → ACNP
Volume
58
Issue
8
Year of publication
2000
Pages
1015 - 1021
Database
ISI
SICI code
0567-7351(2000)58:8<1015:SOPTOU>2.0.ZU;2-K
Abstract
The press-sintering process was developed to prepare Al2O3 microporous cera mics, and these ceramics were coated with Al2O3, ZrO2 and TiO2 membrane by sol-gel method to obtain the unsymmetrical composite ceramics membranes in this paper. In the press-sintering process, the powder was agglomerated, an d the w(PVA) was controlled at 15%, 25% and 30%, the agglomerated powder wa s 10 mu m in size, then pressed and sintered at 1250 degrees C, and micropo rous ceramics with pore diameter of 2 mu m, 6 mu m and 10 mu m, open pore r atio higher than 40%, crushing strength of 50N could be achieved. Using the microporous ceramics with pore diameter of 2 mu m, 6 mu m and 10 mu m as s ubstrate, sol-gel concentration of 0.5g/mL(salt), the substrates were dried slowly at 25 degrees C and 80 degrees C successively, then sintered at 100 0 degrees C, the unsymmetrical composite ceramics membranes with pore diame ter of 200nm, 400nm and 600nm, thickness of about 40 mu m could be develope d by the sol-gel method. The membranes can be used as filter for gas or liq uid, especially be used as substrate for Pd-Ag alloy membrane.