Naslov
Crystallization Behavior Of Hybrid Premullite Powders Synthesized By Sol-Gel Method

Autori
Macan, Jelena ; Ivanković, Hrvoje ; Tkalčec, Emilija

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Conference Proceedings MATRIB 2004 / Grilec, Krešimir - Zagreb : Hrvatsko društvo za materijale i tribologiju (HDMT), 2004, 158-163

Skup
MATRIB 2004, Materials, Tribology, Processing

Mjesto i datum
Vela Luka, Hrvatska, 23.06.2004. - 25.06.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
mullite; sol-gel; crystallization

Sažetak
Hybrid premullite powders of stoichiometric composition (Al:Si = 3:1) were prepared by sol-gel process, making use of Al(NO_3)_3x9H_2O and Si(OC_2H_5)_4 (TEOS) as precursors. The quantity of water in the gelling system was systematically modified to influence the mechanism of hydrolysis and condensation reactions, either by adding water, or by previous drying of Al(NO_3)_3x9H_2O. The crystallization behavior of premullite powders was investigated by combined differential scanning calorimetry and thermogravimetric analysis (DSC/TGA) and X-ray diffraction (XRD). It was found that quantity of water present during the synthesis of the premullite powders significantly influences their subsequent crystallization behavior, and accordingly their structure. This is the result of the tendency of aluminum to form complex polymeric structures in aqueous solutions. Therefore it is possible to control the crystallization behavior of the premullite sol-gel powders through quantity of added water.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA