2024-03-28T15:12:42Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/192312021-06-07T12:33:00Zcom_10261_78com_10261_3com_10261_34com_10261_5col_10261_331col_10261_287
http://hdl.handle.net/10261/19231
10.1111/j.1551-2916.2005.00771.x
19058
Synthesis of Mullite Powders Through a Suspension Combustion Process
John Wiley & Sons
2006
artículo
Burgos-Montes, Olga
Moreno Botella, Rodrigo María
rp13477
Colomer, María T.
rp14114
Fariñas, Juan C.
2006
This work reports on the synthesis of mullite powders by a suspension
combustion process. Aluminum nitrate, as a source of
Al, and a colloidal silica suspension, as a source of Si, are used
as reagents, and urea serves as the fuel. This colloidal suspension
allows a complete mixing of the reactants, thus promoting a
core-shell reaction to produce the mullite. The powders obtained
need to be treated at a high temperature to form the mullite.
However, when ammonium nitrate is also added as a combustion
aid, the mullite phase is directly obtained without any further
treatment. A chemical reaction involving all these compounds is
proposed, and the thermodynamic parameters are calculated in
order to predict the temperature reached during the combustion
process. The addition of ammonium nitrate reduces the temperature
of the reaction by ca. 1501C. Once the conditions for the
combustion reaction are optimized, the Al/Si ratio is modified in
an attempt to obtain monophasic mullite.
closedAccess
J. Am. Ceram. Soc., 89 [2] 484–489