Effects of Complex Precursors on Alkoxide‐Derived Cordierite Powder
作者:
Masahiko Okuyama,
Toshimi Fukui,
Chihiro Sakurai,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 1
页码: 153-160
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb05458.x
出版商: Blackwell Publishing Ltd
关键词: cordierite;alkoxide;powders;Raman spectroscopy;nuclear magnetic spectroscopy
数据来源: WILEY
摘要:
Preparation of chemically homogeneous cordierite powders of submicrometer size was investigated using alkoxide precursors, synthesized from Mg metal, Al(OBus)3, and partially prehydrolyzed Si(OEt)4. The amount of partial prehydrolysis water in precursor synthesis was changed to study the effects on the hydrolysis products. In the hydrolysis of the diluted solution of the precursor, product morphology was quite sensitive to the precursor, and different morphologies such as gelation, gel precipitation, and powder precipitation were observed. A redispersable powder of submicrometer size was obtained only from the precursor synthesized at a H2O/Si(OEt)4ratio of 1.2. Differences were also observed in minor crystalline phases among calcined hydrolysis products. The alkoxide precursors were characterized using Raman spectroscopy, gas chromatography, and NMR spectroscopy. The differences in hydrolysis products are most likely due to differences in hydrolysis and condensation of different chemical species in precursors.
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