Al2TiO5 -: New contributions to its preparation via the sol-gel technique

被引：0
|
作者：
Tudyka, S [1 ]
Pflanz, K [1 ]
Stroh, N [1 ]
Aldinger, F [1 ]
Brunner, H [1 ]
机构：
[1] Fraunhofer Inst Interfacial Engn & Biotechnol, D-70569 Stuttgart, Germany
来源：
22ND ANNUAL CONFERENCE ON COMPOSITES, ADVANCED CERAMICS, MATERIALS, AND STRUCTURES: B | 1998年 / 19卷 / 04期
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D O I：
暂无
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：
Fine powders of aluminium titanate (beta-Al2TiO5) are conventionally prepared by starting with a mixture of Al- and Ti-alkoxides in the molar ratio of 2:1, hydrolysis and heating the precipitate to temperatures > approximate to 1300 degrees C. We applied an alternative route and replaced the mixture of alkoxides by the novel heterometallic alkoxide Al2Ti((OPr)-Pr-i)ra. X-ray diffraction powder patterns of sintered precipitates reveal no deviation in phase formation and composition from conventionally prepared samples. Precipitates heated at 700 and 1000 degrees C for 14 h show binary phases of TiO2 (anatase, rutile) and TiO2 (rutile) + alpha-Al2O3 respectively. No metastable Al2O3-phases (gamma,delta, theta) are detected. Al2TiO5-formation is observed at temperatures > 1300 degrees C. Shortening of sintering time to 1.5 h exhibits same phases with lower intensities of X-ray peaks.
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页码：559 / 565
页数：7
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