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Titel: Crystallization kinetics of mullite formation in diphasic gels containing different alumina components
Verfasser: Tkalcec, Emilija
Ivankovic, Hrvoje
Nass, Rüdiger
Schmidt, Helmut K.
Sprache: Englisch
Erscheinungsjahr: 2003
Quelle: Journal of the European Ceramic Society. - 23. 2003, 9, S. 1465-1475
SWD-Schlagwörter: Kristallisation
Korngröße
Reaktionskinetik
Kinetik
Mullit
Sol-Gel-Verfahren
Siliciumdioxid
Aluminium oxydatum
DDC-Sachgruppe: 620 Ingenieurwissenschaften und Maschinenbau
Dokumentart : Journalartikel
Kurzfassung: 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 zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-30588
hdl:20.500.11880/24790
http://dx.doi.org/10.22028/D291-24734
SciDok-Publikation: 9-Dez-2010
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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