@Article{CamposCiMaSiRoTh:2014:GeTeIn,
author = "Campos, Tiago M. B. and Cividanes, Luciana S. and Machado,
Jo{\~a}o Paulo Barros and Simonetti, Evelyn A. N. and Rodrigues,
Liana A. and Thim, Gilmar P.",
affiliation = "{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and
{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and {Universidade do
Vale do Para{\'{\i}}ba (UNIVAP)} and {Instituto Tecnol{\'o}gico
de Aeron{\'a}utica (ITA)}",
title = "Mullite crystallization using fully hydrolyzed silica sol: the
gelation temperature influence",
journal = "Journal of Sol-Gel Science and Technology",
year = "2014",
volume = "1",
number = "1",
pages = "100--107",
month = "Feb.",
keywords = "mullite, sol–gel, ethylene glycol, crystallization.",
abstract = "Mullite is an aluminosilicate widely used as a structural material
for high temperature applications. This paper studies the effect
of the gelation temperature on the synthesis of two mullite
precursors: polymeric and colloidal silica, using both in
fully-hydrolyzed silica sol, derived from sodium silicate. The
gels were synthesized using aqueous silicic acid and aluminum
nitrate. Ethylene glycol was added into polymeric gels. Two
gelation temperatures were used: 80 and 100 °C. In the polymeric
precursor, the increasing of the gelation temperature caused an
increase in the silica incorporation inside the mullite
crystalline lattice at 1,000 °C, and it also generated an increase
in the reaction extent at all calcination temperatures. In the
colloidal precursors, these effects were more intense than in the
polymeric precursors in terms of yield. Colloidal samples calcined
at 1,250 °C crystallized cristobalite and alpha alumina in
addition to mullite when they were previously gelled at 80 °C. On
the other hand, the same sample gelled at 100 °C led to only
crystallized mullite. The reaction extent increased by more than
20 % for colloidal samples gelled at 100 °C compared to colloidal
samples gelled at 80 °C (calcined at 1,250 °C). This increase was
due to the almost total incorporation of alumina and silica in the
crystalline lattice of mullite.",
doi = "10.1007/s10971-014-3285-9",
url = "http://dx.doi.org/10.1007/s10971-014-3285-9",
issn = "0928-0707 and 1573-4846",
label = "lattes: 5076862030728693 3 CamposCiMaSiRoTh:2014:GeTeIn",
language = "en",
targetfile = "art_10.1007_s10971-014-3285-9-1.pdf",
url = "http://link.springer.com/article/10.1007/s10971-014-3285-9",
urlaccessdate = "03 maio 2024"
}