Please use this identifier to cite or link to this item:
doi:10.22028/D291-24734
Title: | Crystallization kinetics of mullite formation in diphasic gels containing different alumina components |
Author(s): | Tkalcec, Emilija Ivankovic, Hrvoje Nass, Rüdiger Schmidt, Helmut K. |
Language: | English |
Year of Publication: | 2003 |
OPUS Source: | Journal of the European Ceramic Society. - 23. 2003, 9, S. 1465-1475 |
SWD key words: | Kristallisation Korngröße Reaktionskinetik Kinetik Mullit Sol-Gel-Verfahren Siliciumdioxid Aluminium oxydatum |
DDC notations: | 620 Engineering and machine engineering |
Publikation type: | Journal Article |
Abstract: | The crystallization kinetics of mullite formation in diphasic gels containing TEOS-derived amorphous silica and alumina component in different crystalline form and particle size has been studied using quantitative X-ray diffraction (QXRD) with 3:2 mullite as a standard and transmission electron microscopy (TEM). As the source of alumina component, aluminum nitrate nonahydrate, commercial gamma-Al2O3 and boehmite (gamma-AlOOH) were used. The results were consistent with previous studies which indicated that mullite forms initially by nucleation and growth. During the second slow stage of transformation, mullite with approximate 2:1 composition subsequently converts further into 3:2. This process is the fastest in the precursor with the smallest particle size of alumina, and the slowest in the sample with boehmite-derived alumina. In very fine scale of morphology the conversion of 2:1 mullite started even in the first stage of transformation. |
Link to this record: | urn:nbn:de:bsz:291-scidok-30588 hdl:20.500.11880/24790 http://dx.doi.org/10.22028/D291-24734 |
Date of registration: | 9-Dec-2010 |
Faculty: | SE - Sonstige Einrichtungen |
Department: | SE - INM Leibniz-Institut für Neue Materialien |
Collections: | INM SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
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