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. |
 PDF (0.3 MB) |
|
