Synthesis and characterization of submicrometer monosized ceramic powders of Aluminium titanate-Mullite composite by sol-gel process

Submicrometer, monosized ceramic powders of Al2Ti05 Mullite and Aluminium titanate–Mullite compositions were prepared by stepwise alkoxide hydrolysis of tetraethylorthosilicate and titaniumtetraethoxide in A12O3 ethanolic solutions. All particles produced by sol–gel–process were amorphous, monodispersed and with a narrow particle–size distribution. Compacts fired above 1300°C formed Aluminium titanate. Mullite formed first at 1480°C. After decomposition test at 1100°C and cyclic decomposition test at 750°C–1400°C–750°C for 100 hours, Aluminium titanate was stabilized 80% by composition with Mullite.