Abstract
Resumen en: Mullite is an excellent structural material due to its high temperature stability, high electrical insulation capabilities and creep resistance. This mat...
Highlights
Mullite has the nominal composition of 3Al2O3. 2SiO2 (3:2 mullite) and is the only stable crystalline phase in the SiO2Al2O3 binary system at atmospheric pressure (Schneider et al, 2008)
ethylene glycol (EG) should increase the homogeneity of mullite precursors and should make it possible to mullite crystallizes at 1,000°C, which is the mullite crystallization temperature of single phase precursor
This work showed, using images of a scanning electronic microscope with energy dispersive X-ray (EDXelemental mapping), that the samples prepared with EG are constituted by silicon and aluminum particles whose sizes are much smaller than those present in the sample prepared without EG
Summary
Mullite has the nominal composition of 3Al2O3. 2SiO2 (3:2 mullite) and is the only stable crystalline phase in the SiO2Al2O3 binary system at atmospheric pressure (Schneider et al, 2008). When the precursor is homogeneous, the mullite crystallization temperature is lower, and the alumina content in the mullite structure is the same of the starting material. In this paper, mullite was obtained by sol-gel process using silicic acid and aluminum nitrite as silica and alumina precursors.
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