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Crystallization kinetics of mullite formation in diphasic gels containing different alumina components (CROSBI ID 94870)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Tkalčec, Emilija ; Ivanković, Hrvoje ; Nass, Ruediger ; Schmidt, Helmut Crystallization kinetics of mullite formation in diphasic gels containing different alumina components // Journal of the European Ceramic Society, 23 (2003), 1465-1475-x

Podaci o odgovornosti

Tkalčec, Emilija ; Ivanković, Hrvoje ; Nass, Ruediger ; Schmidt, Helmut

engleski

Crystallization kinetics of mullite formation in diphasic gels containing different alumina components

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.

Grain size; Kinetics; Mullite; Phase development; Sol-gel process

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Podaci o izdanju

23

2003.

1465-1475-x

objavljeno

0955-2219

Povezanost rada

Fizika, Kemijsko inženjerstvo

Indeksiranost