عنوان مقاله [English]
The systems of Al2O3+Si, Al+SiO2 and Al + Si were prepared to study the effect of reaction bonding process on the mullite formation in temperature range 700-1600°C. Results showed that the reaction bonded mullite (RBM) starting from Al2O3+Si raw materials, starts to form at 1450°C and the reaction is not complete by 1600°C. XRD patterns for samples in the Al+SiO2 system showed reduction of SiO2 by Al, formation of α-Al2O3 and SiO2-derived Si oxidation and finally mullite formation. XRD patterns for the Al+Si system showed that there is a thermodynamic reaction between Al and Oxygen at 900°C to form α- Al2O3. Si oxidation and mullite formation were not detected in this system.