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

Ceramics-Silikáty 47, (4) 149 - 154 (2003)


EFFECT OF ORGANIC ADDITIVES ON CRYSTALLIZATION OF BOEHMITE GELS
 
Holková Zuzana 1, Pach Ladislav 1, Majling Ján 1, Kákoš Jozef 1, Kadlečíková Magdaléna 2
 
1 Department of Ceramics, Glass and Cement, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic
2 Department of Microelectronic, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovak Republic

Keywords: Boehmite, Gel, Seeding, Crystallization, Organic Additives, PVA, EG
 

Monolithic planar boehmite gels of thickness of ~0.15 mm unseeded, seeded by Fe(NO₃)₃ and doped (3 wt.%) with organics (PVA, PEG and EG) were examined by photoluminescence spectroscopy, in-situ optical transmittance and SEM. Polymeric organic additives although burned up at low temperatures (550°C), leave microstructure traces, having significant effect on high temperature processes, crystallization and sintering. Actually, polymeric additives (PVA or PEG) cancel a profound positive high effect of Fe(NO₃)₃ to α-Al₂O₃ nucleation.


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