Print ISSN: 1681-6900

Online ISSN: 2412-0758

Author : Alaa Jaber, Hussein


Synthesis of Mullite Powder from Aluminum Nitrate and Precipitated Silica using Sol-Gel Process

Hussein Alaa Jaber

Engineering and Technology Journal, 2016, Volume 34, Issue 8, Pages 1491-1498

In this work, a new route for possibility synthesizing high purity submicron size mullite (3A12O3.2SiO2) powder at relatively low temperature. Mullite precursor has been prepared from mixing precipitated silica powder with solution of aluminum nitrate nonahydrate (Al(NO3)3.9H2O) through sol-gel process, in order to obtain composite powder. The formed precursor gel was calcined at temperatures of (1100, 1150, 1200 and 1250)°C for 1 hour. The influence of calcination temperatures of the mullite synthesis was discussed. The microstructure tests of calcined materials were investigated by x-ray diffractometer (XRD), scanning electron microscopy (SEM), and energy dispersive x-ray spectroscopy (EDX). X-ray analysis results identified the mullitization initiated at 1200°C, and the mullite phase was completely formed at 1250°C. The SEM micrographs show the microstructure of mullite powder had been aggregated in the regular and nearly spherical-like appearances with diameters in the range of (100-200) nm.