ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 49, (4) 263 - 268 (2005)


SINTERING OF TRANSIENT Al₂O₃ PHASES IN MONOLITHIC GELS
 
Bodišová Katarína, Pach Ladislav, Kovár Vladimír
 
Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 81237 Bratislava, Slovak Republic

Keywords: Boehmite gel, Sintering, Kinetics, Nanoparticles
 

The sintering of transient alumina phases in boehmite derived alumina gels was carried out under static thermal conditions (at sintering temperatures between 1075-1225°C) and under dynamic thermal conditions (in temperature range approximately 800-1200°C). At a low heating rate (2-10°C/min) the sintering of transient Al₂O₃ phases could be modeled by grain boundary and simultaneous bulk diffusion with activation energies 323 kJ/mol and 511 kJ/mol, respectively. At rapid heating the sintering kinetics is probably affected also by the remaining water escape. It can cause particle rearrangement in the first stage of sintering. Weight loss experiments were used to determine the amount of water escaped during sintering


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